pragma solidity =0.6.6;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "./libraries/TransferHelper.sol";
import "./interfaces/IPancakeRouter02.sol";
import "./interfaces/IWETH.sol";
contract FeeReceiver is Pausable, Ownable {
    using SafeMath for uint256;
    event BuybackRateUpdated(uint256 newBuybackRate);
    event RevenueReceiverUpdated(address newRevenueReceiver);
    event RouterWhitelistUpdated(address router, bool status);
    event BuybackExecuted(uint256 amountBuyback, uint256 amountRevenue);
    address internal constant ZERO_ADDRESS = address(0);
    uint256 public constant FEE_DENOMINATOR = 10000;
    IPancakeRouter02 public pancakeRouter;
    address payable public revenueReceiver;
    uint256 public buybackRate;
    address public SYA;
    address public WETH;
    mapping(address => bool) public routerWhitelist;
    constructor(
        IPancakeRouter02 _pancakeRouterV2,
        address _SYA,
        address _WETH,
        address payable _revenueReceiver,
        uint256 _buybackRate
    ) public {
        pancakeRouter = _pancakeRouterV2;
        SYA = _SYA;
        WETH = _WETH;
        revenueReceiver = _revenueReceiver;
        buybackRate = _buybackRate;
        routerWhitelist[address(pancakeRouter)] = true;
    }
    /// @dev executes the buyback, buys SYA on pancake & sends revenue to the revenueReceiver by the defined rate.
    function executeBuyback() external whenNotPaused {
        require(address(this).balance > 0, "FeeReceiver: No balance for buyback");
        address[] memory path = new address[](2);
        path[0] = WETH;
        path[1] = SYA;
        uint256 balance = address(this).balance;
        uint256 amountBuyback = balance.mul(buybackRate).div(FEE_DENOMINATOR);
        uint256 amountRevenue = balance.sub(amountBuyback);
        pancakeRouter.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amountBuyback}(
            0,
            path,
            ZERO_ADDRESS,
            block.timestamp
        );
        TransferHelper.safeTransferETH(revenueReceiver, amountRevenue);
        emit BuybackExecuted(amountBuyback, amountRevenue);
    }
    /// @dev converts collected tokens from fees to ETH for executing buybacks
    function convertToETH(
        address _router,
        IERC20 _token,
        bool _fee
    ) public whenNotPaused {
        require(routerWhitelist[_router], "FeeReceiver: Router not whitelisted");
        address[] memory path = new address[](2);
        path[0] = address(_token);
        path[1] = WETH;
        uint256 balance = _token.balanceOf(address(this));
        TransferHelper.safeApprove(address(_token), address(pancakeRouter), balance);
        if (_fee) {
            IPancakeRouter02(_router).swapExactTokensForETHSupportingFeeOnTransferTokens(
                balance,
                0,
                path,
                address(this),
                block.timestamp
            );
        } else {
            IPancakeRouter02(_router).swapExactTokensForETH(balance, 0, path, address(this), block.timestamp);
        }
    }
    /// @dev converts WETH to ETH
    function unwrapWETH() public whenNotPaused {
        uint256 balance = IWETH(WETH).balanceOf(address(this));
        require(balance > 0, "FeeReceiver: Nothing to unwrap");
        IWETH(WETH).withdraw(balance);
    }
    /// @dev lets the owner update update the router whitelist
    function updateRouterWhiteliste(address _router, bool _status) external onlyOwner {
        routerWhitelist[_router] = _status;
        emit RouterWhitelistUpdated(_router, _status);
    }
    /// @dev lets the owner update the buyback rate
    function updateBuybackRate(uint256 _newBuybackRate) external onlyOwner {
        buybackRate = _newBuybackRate;
        emit BuybackRateUpdated(_newBuybackRate);
    }
    /// @dev lets the owner update the revenue receiver address
    function updateRevenueReceiver(address payable _newRevenueReceiver) external onlyOwner {
        revenueReceiver = _newRevenueReceiver;
        emit RevenueReceiverUpdated(_newRevenueReceiver);
    }
    /// @dev lets the owner withdraw ETH from the contract
    function withdrawETH(address payable to, uint256 amount) external onlyOwner {
        to.transfer(amount);
    }
    /// @dev lets the owner withdraw any ERC20 Token from the contract
    function withdrawERC20Token(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        IERC20(token).transfer(to, amount);
    }
    /// @dev allows to receive ETH on this contract
    receive() external payable {}
    /// @dev lets the owner pause the contract
    function pause() external onlyOwner {
        _pause();
    }
    /// @dev lets the owner unpause the contract
    function unpause() external onlyOwner {
        _unpause();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./Context.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
pragma solidity =0.6.6;
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: APPROVE_FAILED");
    }
    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FAILED");
    }
    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FROM_FAILED");
    }
    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, "TransferHelper: ETH_TRANSFER_FAILED");
    }
}
pragma solidity >=0.6.2;
import "./IPancakeRouter01.sol";
interface IPancakeRouter02 is IPancakeRouter01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}
pragma solidity >=0.5.0;
interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint256 value) external returns (bool);
    function withdraw(uint256) external;
    function approve(address _spender, uint256 _amount) external returns (bool);
    function balanceOf(address _account) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
pragma solidity >=0.6.2;
interface IPancakeRouter01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);
    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);
    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);
    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);
    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);
    function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);
    function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);
}
pragma solidity =0.6.6;
import "@0x/contracts-utils/contracts/src/v06/LibBytesV06.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "./libraries/TransferHelper.sol";
import "./libraries/PancakeLibrary.sol";
import "./interfaces/IReferralRegistry.sol";
import "./interfaces/IWETH.sol";
import "./interfaces/IZerox.sol";
contract FloozRouter is Ownable, Pausable, ReentrancyGuard {
    using SafeMath for uint256;
    using LibBytesV06 for bytes;
    event SwapFeeUpdated(uint16 swapFee);
    event ReferralRegistryUpdated(address referralRegistry);
    event ReferralRewardRateUpdated(uint16 referralRewardRate);
    event ReferralsActivatedUpdated(bool activated);
    event FeeReceiverUpdated(address payable feeReceiver);
    event BalanceThresholdUpdated(uint256 balanceThreshold);
    event CustomReferralRewardRateUpdated(address indexed account, uint16 referralRate);
    event ReferralRewardPaid(address from, address indexed to, address tokenOut, address tokenReward, uint256 amount);
    event ForkUpdated(address factory);
    // Denominator of fee
    uint256 public constant FEE_DENOMINATOR = 10000;
    // Numerator of fee
    uint16 public swapFee;
    // address of WETH
    address public immutable WETH;
    // address of zeroEx proxy contract to forward swaps
    address payable public immutable zeroEx;
    // address of 1inch contract to forward swaps
    address payable public immutable oneInch;
    // address of referral registry that stores referral anchors
    IReferralRegistry public referralRegistry;
    // address of SYA token
    IERC20 public saveYourAssetsToken;
    // balance threshold of SYA tokens which actives feeless swapping
    uint256 public balanceThreshold;
    // address that receives protocol fees
    address payable public feeReceiver;
    // percentage of fees that will be paid as rewards
    uint16 public referralRewardRate;
    // stores if the referral system is turned on or off
    bool public referralsActivated;
    // stores individual referral rates
    mapping(address => uint16) public customReferralRewardRate;
    // stores uniswap forks status, index is the factory address
    mapping(address => bool) public forkActivated;
    // stores uniswap forks initCodes, index is the factory address
    mapping(address => bytes) public forkInitCode;
    /// @dev construct this contract
    /// @param _WETH address of WETH.
    /// @param _swapFee nominator for swapFee. Denominator = 10000
    /// @param _referralRewardRate percentage of swapFee that are paid out as rewards
    /// @param _feeReceiver address that receives protocol fees
    /// @param _balanceThreshold balance threshold of SYA tokens which actives feeless swapping
    /// @param _saveYourAssetsToken address of SYA token
    /// @param _referralRegistry address of referral registry that stores referral anchors
    /// @param _zeroEx address of zeroX proxy contract to forward swaps
    /// @param _oneInch address of 1inch contract to forward swaps
    constructor(
        address _WETH,
        uint16 _swapFee,
        uint16 _referralRewardRate,
        address payable _feeReceiver,
        uint256 _balanceThreshold,
        IERC20 _saveYourAssetsToken,
        IReferralRegistry _referralRegistry,
        address payable _zeroEx,
        address payable _oneInch
    ) public {
        WETH = _WETH;
        swapFee = _swapFee;
        referralRewardRate = _referralRewardRate;
        feeReceiver = _feeReceiver;
        saveYourAssetsToken = _saveYourAssetsToken;
        balanceThreshold = _balanceThreshold;
        referralRegistry = _referralRegistry;
        zeroEx = _zeroEx;
        oneInch = _oneInch;
        referralsActivated = true;
    }
    /// @dev execute swap directly on Uniswap/Pancake & simular forks
    /// @param fork fork used to execute swap
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    /// @return amounts
    function swapExactETHForTokens(
        address fork,
        uint256 amountOutMin,
        address[] calldata path,
        address referee
    ) external payable whenNotPaused isValidFork(fork) isValidReferee(referee) returns (uint256[] memory amounts) {
        require(path[0] == WETH, "FloozRouter: INVALID_PATH");
        referee = _getReferee(referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            msg.value,
            referee,
            false
        );
        amounts = _getAmountsOut(fork, swapAmount, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(_pairFor(fork, path[0], path[1]), amounts[0]));
        _swap(fork, amounts, path, msg.sender);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountIn amount of tokensIn
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        address fork,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address referee
    ) external whenNotPaused isValidFork(fork) isValidReferee(referee) {
        require(path[path.length - 1] == WETH, "FloozRouter: INVALID_PATH");
        referee = _getReferee(referee);
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(fork, path[0], path[1]), amountIn);
        _swapSupportingFeeOnTransferTokens(fork, path, address(this));
        uint256 amountOut = IERC20(WETH).balanceOf(address(this));
        IWETH(WETH).withdraw(amountOut);
        (uint256 amountWithdraw, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            amountOut,
            referee,
            false
        );
        require(amountWithdraw >= amountOutMin, "FloozRouter: LOW_SLIPPAGE");
        TransferHelper.safeTransferETH(msg.sender, amountWithdraw);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountIn amount if tokens In
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    /// @return amounts
    function swapExactTokensForTokens(
        address fork,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address referee
    ) external whenNotPaused isValidFork(fork) isValidReferee(referee) returns (uint256[] memory amounts) {
        referee = _getReferee(referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            amountIn,
            referee,
            false
        );
        amounts = _getAmountsOut(fork, swapAmount, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(fork, path[0], path[1]), swapAmount);
        _swap(fork, amounts, path, msg.sender);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(path[0], path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountIn amount if tokens In
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    /// @return amounts
    function swapExactTokensForETH(
        address fork,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address referee
    ) external whenNotPaused isValidFork(fork) isValidReferee(referee) returns (uint256[] memory amounts) {
        require(path[path.length - 1] == WETH, "FloozRouter: INVALID_PATH");
        referee = _getReferee(referee);
        amounts = _getAmountsOut(fork, amountIn, path);
        (uint256 amountWithdraw, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            amounts[amounts.length - 1],
            referee,
            false
        );
        require(amountWithdraw >= amountOutMin, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(fork, path[0], path[1]), amounts[0]);
        _swap(fork, amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(msg.sender, amountWithdraw);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountOut expected amount of tokens out
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    /// @return amounts
    function swapETHForExactTokens(
        address fork,
        uint256 amountOut,
        address[] calldata path,
        address referee
    ) external payable whenNotPaused isValidFork(fork) isValidReferee(referee) returns (uint256[] memory amounts) {
        require(path[0] == WETH, "FloozRouter: INVALID_PATH");
        amounts = _getAmountsIn(fork, amountOut, path);
        (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(amounts[0], referee, true);
        require(amounts[0].add(feeAmount).add(referralReward) <= msg.value, "FloozRouter: EXCESSIVE_INPUT_AMOUNT");
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(_pairFor(fork, path[0], path[1]), amounts[0]));
        _swap(fork, amounts, path, msg.sender);
        // refund dust eth, if any
        if (msg.value > amounts[0].add(feeAmount).add(referralReward))
            TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0].add(feeAmount).add(referralReward));
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountIn amount if tokens In
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        address fork,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address referee
    ) external whenNotPaused isValidFork(fork) isValidReferee(referee) {
        referee = _getReferee(referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            amountIn,
            referee,
            false
        );
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(fork, path[0], path[1]), swapAmount);
        uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(msg.sender);
        _swapSupportingFeeOnTransferTokens(fork, path, msg.sender);
        require(
            IERC20(path[path.length - 1]).balanceOf(msg.sender).sub(balanceBefore) >= amountOutMin,
            "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT"
        );
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(path[0], path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountOut expected tokens to receive
    /// @param amountInMax maximum tokens to send
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    /// @return amounts
    function swapTokensForExactTokens(
        address fork,
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address referee
    ) external whenNotPaused isValidFork(fork) isValidReferee(referee) returns (uint256[] memory amounts) {
        referee = _getReferee(referee);
        amounts = _getAmountsIn(fork, amountOut, path);
        (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(amounts[0], referee, true);
        require(amounts[0].add(feeAmount).add(referralReward) <= amountInMax, "FloozRouter: EXCESSIVE_INPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(fork, path[0], path[1]), amounts[0]);
        _swap(fork, amounts, path, msg.sender);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(path[0], path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountOut expected tokens to receive
    /// @param amountInMax maximum tokens to send
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    /// @return amounts
    function swapTokensForExactETH(
        address fork,
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address referee
    ) external whenNotPaused isValidFork(fork) isValidReferee(referee) returns (uint256[] memory amounts) {
        require(path[path.length - 1] == WETH, "FloozRouter: INVALID_PATH");
        referee = _getReferee(referee);
        (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(amountOut, referee, true);
        amounts = _getAmountsIn(fork, amountOut.add(feeAmount).add(referralReward), path);
        require(amounts[0].add(feeAmount).add(referralReward) <= amountInMax, "FloozRouter: EXCESSIVE_INPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(fork, path[0], path[1]), amounts[0]);
        _swap(fork, amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(msg.sender, amountOut);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param fork fork used to execute swap
    /// @param amountOutMin minimum expected tokens to receive
    /// @param path Sell path.
    /// @param referee address of referee for msg.sender, 0x adress if none
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        address fork,
        uint256 amountOutMin,
        address[] calldata path,
        address referee
    ) external payable whenNotPaused isValidFork(fork) isValidReferee(referee) {
        require(path[0] == WETH, "FloozRouter: INVALID_PATH");
        referee = _getReferee(referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            msg.value,
            referee,
            false
        );
        IWETH(WETH).deposit{value: swapAmount}();
        assert(IWETH(WETH).transfer(_pairFor(fork, path[0], path[1]), swapAmount));
        uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(msg.sender);
        _swapSupportingFeeOnTransferTokens(fork, path, msg.sender);
        require(
            IERC20(path[path.length - 1]).balanceOf(msg.sender).sub(balanceBefore) >= amountOutMin,
            "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT"
        );
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev returns the referee for a given address, if new, registers referee
    /// @param referee the address of the referee for msg.sender
    /// @return referee address from referral registry
    function _getReferee(address referee) internal returns (address) {
        address sender = msg.sender;
        if (!referralRegistry.hasUserReferee(sender) && referee != address(0)) {
            referralRegistry.createReferralAnchor(sender, referee);
        }
        return referralRegistry.getUserReferee(sender);
    }
    // **** SWAP ****
    // requires the initial amount to have already been sent to the first pair
    function _swap(
        address fork,
        uint256[] memory amounts,
        address[] memory path,
        address _to
    ) internal {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = PancakeLibrary.sortTokens(input, output);
            uint256 amountOut = amounts[i + 1];
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOut)
                : (amountOut, uint256(0));
            address to = i < path.length - 2 ? _pairFor(fork, output, path[i + 2]) : _to;
            IPancakePair(_pairFor(fork, input, output)).swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
    // **** SWAP (supporting fee-on-transfer tokens) ****
    // requires the initial amount to have already been sent to the first pair
    function _swapSupportingFeeOnTransferTokens(
        address fork,
        address[] memory path,
        address _to
    ) internal {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = PancakeLibrary.sortTokens(input, output);
            IPancakePair pair = IPancakePair(_pairFor(fork, input, output));
            uint256 amountInput;
            uint256 amountOutput;
            {
                // scope to avoid stack too deep errors
                (uint256 reserve0, uint256 reserve1, ) = pair.getReserves();
                (uint256 reserveInput, uint256 reserveOutput) = input == token0
                    ? (reserve0, reserve1)
                    : (reserve1, reserve0);
                amountInput = IERC20(input).balanceOf(address(pair)).sub(reserveInput);
                amountOutput = _getAmountOut(amountInput, reserveInput, reserveOutput);
            }
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOutput)
                : (amountOutput, uint256(0));
            address to = i < path.length - 2 ? _pairFor(fork, output, path[i + 2]) : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
    /// @dev Executes a swap on 0x API
    /// @param data calldata expected by data field on 0x API (https://0x.org/docs/api#response-1)
    /// @param tokenOut the address of currency to sell – 0x address for ETH
    /// @param tokenIn the address of currency to buy – 0x address for ETH
    /// @param referee address of referee for msg.sender, 0x adress if none
    function executeZeroExSwap(
        bytes calldata data,
        address tokenOut,
        address tokenIn,
        address referee
    ) external payable nonReentrant whenNotPaused isValidReferee(referee) {
        referee = _getReferee(referee);
        bytes4 selector = data.readBytes4(0);
        address impl = IZerox(zeroEx).getFunctionImplementation(selector);
        require(impl != address(0), "FloozRouter: NO_IMPLEMENTATION");
        bool isAboveThreshold = userAboveBalanceThreshold(msg.sender);
        // skip fees & rewards for god mode users
        if (isAboveThreshold) {
            (bool success, ) = impl.delegatecall(data);
            require(success, "FloozRouter: REVERTED");
        } else {
            // if ETH in execute trade as router & distribute funds & fees
            if (msg.value > 0) {
                (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
                    msg.value,
                    referee,
                    false
                );
                (bool success, ) = impl.call{value: swapAmount}(data);
                require(success, "FloozRouter: REVERTED");
                TransferHelper.safeTransfer(tokenIn, msg.sender, IERC20(tokenIn).balanceOf(address(this)));
                _withdrawFeesAndRewards(address(0), tokenIn, referee, feeAmount, referralReward);
            } else {
                uint256 balanceBefore = IERC20(tokenOut).balanceOf(msg.sender);
                (bool success, ) = impl.delegatecall(data);
                require(success, "FloozRouter: REVERTED");
                uint256 balanceAfter = IERC20(tokenOut).balanceOf(msg.sender);
                require(balanceBefore > balanceAfter, "INVALID_TOKEN");
                (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
                    balanceBefore.sub(balanceAfter),
                    referee,
                    true
                );
                _withdrawFeesAndRewards(tokenOut, tokenIn, referee, feeAmount, referralReward);
            }
        }
    }
    /// @dev calculates swap, fee & reward amounts
    /// @param amount total amount of tokens
    /// @param referee the address of the referee for msg.sender
    function _calculateFeesAndRewards(
        uint256 amount,
        address referee,
        bool additiveFee
    )
        internal
        view
        returns (
            uint256 swapAmount,
            uint256 feeAmount,
            uint256 referralReward
        )
    {
        // no fees for users above threshold
        if (userAboveBalanceThreshold(msg.sender)) {
            swapAmount = amount;
        } else {
            if (additiveFee) {
                swapAmount = amount;
                feeAmount = swapAmount.mul(FEE_DENOMINATOR).div(FEE_DENOMINATOR.sub(swapFee)).sub(amount);
            } else {
                feeAmount = amount.mul(swapFee).div(FEE_DENOMINATOR);
                swapAmount = amount.sub(feeAmount);
            }
            // calculate referral rates, if referee is not 0x
            if (referee != address(0) && referralsActivated) {
                uint16 referralRate = customReferralRewardRate[referee] > 0
                    ? customReferralRewardRate[referee]
                    : referralRewardRate;
                referralReward = feeAmount.mul(referralRate).div(FEE_DENOMINATOR);
                feeAmount = feeAmount.sub(referralReward);
            } else {
                referralReward = 0;
            }
        }
    }
    /// @dev lets the admin update an Uniswap style fork
    function updateFork(
        address _factory,
        bytes calldata _initCode,
        bool _activated
    ) external onlyOwner {
        forkActivated[_factory] = _activated;
        forkInitCode[_factory] = _initCode;
        emit ForkUpdated(_factory);
    }
    /// @dev returns if a users is above the SYA threshold and can swap without fees
    function userAboveBalanceThreshold(address _account) public view returns (bool) {
        return saveYourAssetsToken.balanceOf(_account) >= balanceThreshold;
    }
    /// @dev returns the fee nominator for a given user
    function getUserFee(address user) public view returns (uint256) {
        saveYourAssetsToken.balanceOf(user) >= balanceThreshold ? 0 : swapFee;
    }
    /// @dev lets the admin update the swapFee nominator
    function updateSwapFee(uint16 newSwapFee) external onlyOwner {
        swapFee = newSwapFee;
        emit SwapFeeUpdated(newSwapFee);
    }
    /// @dev lets the admin update the referral reward rate
    function updateReferralRewardRate(uint16 newReferralRewardRate) external onlyOwner {
        require(newReferralRewardRate <= FEE_DENOMINATOR, "FloozRouter: INVALID_RATE");
        referralRewardRate = newReferralRewardRate;
        emit ReferralRewardRateUpdated(newReferralRewardRate);
    }
    /// @dev lets the admin update which address receives the protocol fees
    function updateFeeReceiver(address payable newFeeReceiver) external onlyOwner {
        feeReceiver = newFeeReceiver;
        emit FeeReceiverUpdated(newFeeReceiver);
    }
    /// @dev lets the admin update the SYA balance threshold, which activates feeless trading for users
    function updateBalanceThreshold(uint256 newBalanceThreshold) external onlyOwner {
        balanceThreshold = newBalanceThreshold;
        emit BalanceThresholdUpdated(balanceThreshold);
    }
    /// @dev lets the admin update the status of the referral system
    function updateReferralsActivated(bool newReferralsActivated) external onlyOwner {
        referralsActivated = newReferralsActivated;
        emit ReferralsActivatedUpdated(newReferralsActivated);
    }
    /// @dev lets the admin set a new referral registry
    function updateReferralRegistry(address newReferralRegistry) external onlyOwner {
        referralRegistry = IReferralRegistry(newReferralRegistry);
        emit ReferralRegistryUpdated(newReferralRegistry);
    }
    /// @dev lets the admin set a custom referral rate
    function updateCustomReferralRewardRate(address account, uint16 referralRate) external onlyOwner returns (uint256) {
        require(referralRate <= FEE_DENOMINATOR, "FloozRouter: INVALID_RATE");
        customReferralRewardRate[account] = referralRate;
        emit CustomReferralRewardRateUpdated(account, referralRate);
    }
    /// @dev returns the referee for a given user – 0x address if none
    function getUserReferee(address user) external view returns (address) {
        return referralRegistry.getUserReferee(user);
    }
    /// @dev returns if the given user has been referred or not
    function hasUserReferee(address user) external view returns (bool) {
        return referralRegistry.hasUserReferee(user);
    }
    /// @dev lets the admin withdraw ETH from the contract.
    function withdrawETH(address payable to, uint256 amount) external onlyOwner {
        TransferHelper.safeTransferETH(to, amount);
    }
    /// @dev lets the admin withdraw ERC20s from the contract.
    function withdrawERC20Token(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        TransferHelper.safeTransfer(token, to, amount);
    }
    /// @dev distributes fees & referral rewards to users
    function _withdrawFeesAndRewards(
        address tokenReward,
        address tokenOut,
        address referee,
        uint256 feeAmount,
        uint256 referralReward
    ) internal {
        if (tokenReward == address(0)) {
            TransferHelper.safeTransferETH(feeReceiver, feeAmount);
            if (referralReward > 0) {
                TransferHelper.safeTransferETH(referee, referralReward);
                emit ReferralRewardPaid(msg.sender, referee, tokenOut, tokenReward, referralReward);
            }
        } else {
            TransferHelper.safeTransferFrom(tokenReward, msg.sender, feeReceiver, feeAmount);
            if (referralReward > 0) {
                TransferHelper.safeTransferFrom(tokenReward, msg.sender, referee, referralReward);
                emit ReferralRewardPaid(msg.sender, referee, tokenOut, tokenReward, referralReward);
            }
        }
    }
    /// @dev given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function _getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountOut) {
        require(amountIn > 0, "FloozRouter: INSUFFICIENT_INPUT_AMOUNT");
        require(reserveIn > 0 && reserveOut > 0, "FloozRouter: INSUFFICIENT_LIQUIDITY");
        uint256 amountInWithFee = amountIn.mul((9980));
        uint256 numerator = amountInWithFee.mul(reserveOut);
        uint256 denominator = reserveIn.mul(10000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }
    /// @dev given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function _getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountIn) {
        require(amountOut > 0, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        require(reserveIn > 0 && reserveOut > 0, "FloozRouter: INSUFFICIENT_LIQUIDITY");
        uint256 numerator = reserveIn.mul(amountOut).mul(10000);
        uint256 denominator = reserveOut.sub(amountOut).mul(9980);
        amountIn = (numerator / denominator).add(1);
    }
    /// @dev performs chained getAmountOut calculations on any number of pairs
    function _getAmountsOut(
        address fork,
        uint256 amountIn,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2, "FloozRouter: INVALID_PATH");
        amounts = new uint256[](path.length);
        amounts[0] = amountIn;
        for (uint256 i; i < path.length - 1; i++) {
            (uint256 reserveIn, uint256 reserveOut) = _getReserves(fork, path[i], path[i + 1]);
            amounts[i + 1] = _getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }
    /// @dev performs chained getAmountIn calculations on any number of pairs
    function _getAmountsIn(
        address factory,
        uint256 amountOut,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2, "FloozRouter: INVALID_PATH");
        amounts = new uint256[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint256 i = path.length - 1; i > 0; i--) {
            (uint256 reserveIn, uint256 reserveOut) = _getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = _getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
    /// @dev fetches and sorts the reserves for a pair
    function _getReserves(
        address factory,
        address tokenA,
        address tokenB
    ) internal view returns (uint256 reserveA, uint256 reserveB) {
        (address token0, ) = PancakeLibrary.sortTokens(tokenA, tokenB);
        (uint256 reserve0, uint256 reserve1, ) = IPancakePair(_pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }
    /// @dev calculates the CREATE2 address for a pair without making any external calls
    function _pairFor(
        address factory,
        address tokenA,
        address tokenB
    ) internal view returns (address pair) {
        (address token0, address token1) = PancakeLibrary.sortTokens(tokenA, tokenB);
        pair = address(
            uint256(
                keccak256(
                    abi.encodePacked(
                        hex"ff",
                        factory,
                        keccak256(abi.encodePacked(token0, token1)),
                        forkInitCode[factory] // init code hash
                    )
                )
            )
        );
    }
    /// @dev lets the admin pause this contract
    function pause() external onlyOwner {
        _pause();
    }
    /// @dev lets the admin unpause this contract
    function unpause() external onlyOwner {
        _unpause();
    }
    /// @dev allows to receive ETH on the contract
    receive() external payable {}
    modifier isValidFork(address factory) {
        require(forkActivated[factory], "FloozRouter: INVALID_FACTORY");
        _;
    }
    modifier isValidReferee(address referee) {
        require(msg.sender != referee, "FloozRouter: SELF_REFERRAL");
        _;
    }
}
// SPDX-License-Identifier: Apache-2.0
/*
  Copyright 2020 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity ^0.6.5;
import "./errors/LibBytesRichErrorsV06.sol";
import "./errors/LibRichErrorsV06.sol";
library LibBytesV06 {
    using LibBytesV06 for bytes;
    /// @dev Gets the memory address for a byte array.
    /// @param input Byte array to lookup.
    /// @return memoryAddress Memory address of byte array. This
    ///         points to the header of the byte array which contains
    ///         the length.
    function rawAddress(bytes memory input)
        internal
        pure
        returns (uint256 memoryAddress)
    {
        assembly {
            memoryAddress := input
        }
        return memoryAddress;
    }
    /// @dev Gets the memory address for the contents of a byte array.
    /// @param input Byte array to lookup.
    /// @return memoryAddress Memory address of the contents of the byte array.
    function contentAddress(bytes memory input)
        internal
        pure
        returns (uint256 memoryAddress)
    {
        assembly {
            memoryAddress := add(input, 32)
        }
        return memoryAddress;
    }
    /// @dev Copies `length` bytes from memory location `source` to `dest`.
    /// @param dest memory address to copy bytes to.
    /// @param source memory address to copy bytes from.
    /// @param length number of bytes to copy.
    function memCopy(
        uint256 dest,
        uint256 source,
        uint256 length
    )
        internal
        pure
    {
        if (length < 32) {
            // Handle a partial word by reading destination and masking
            // off the bits we are interested in.
            // This correctly handles overlap, zero lengths and source == dest
            assembly {
                let mask := sub(exp(256, sub(32, length)), 1)
                let s := and(mload(source), not(mask))
                let d := and(mload(dest), mask)
                mstore(dest, or(s, d))
            }
        } else {
            // Skip the O(length) loop when source == dest.
            if (source == dest) {
                return;
            }
            // For large copies we copy whole words at a time. The final
            // word is aligned to the end of the range (instead of after the
            // previous) to handle partial words. So a copy will look like this:
            //
            //  ####
            //      ####
            //          ####
            //            ####
            //
            // We handle overlap in the source and destination range by
            // changing the copying direction. This prevents us from
            // overwriting parts of source that we still need to copy.
            //
            // This correctly handles source == dest
            //
            if (source > dest) {
                assembly {
                    // We subtract 32 from `sEnd` and `dEnd` because it
                    // is easier to compare with in the loop, and these
                    // are also the addresses we need for copying the
                    // last bytes.
                    length := sub(length, 32)
                    let sEnd := add(source, length)
                    let dEnd := add(dest, length)
                    // Remember the last 32 bytes of source
                    // This needs to be done here and not after the loop
                    // because we may have overwritten the last bytes in
                    // source already due to overlap.
                    let last := mload(sEnd)
                    // Copy whole words front to back
                    // Note: the first check is always true,
                    // this could have been a do-while loop.
                    // solhint-disable-next-line no-empty-blocks
                    for {} lt(source, sEnd) {} {
                        mstore(dest, mload(source))
                        source := add(source, 32)
                        dest := add(dest, 32)
                    }
                    // Write the last 32 bytes
                    mstore(dEnd, last)
                }
            } else {
                assembly {
                    // We subtract 32 from `sEnd` and `dEnd` because those
                    // are the starting points when copying a word at the end.
                    length := sub(length, 32)
                    let sEnd := add(source, length)
                    let dEnd := add(dest, length)
                    // Remember the first 32 bytes of source
                    // This needs to be done here and not after the loop
                    // because we may have overwritten the first bytes in
                    // source already due to overlap.
                    let first := mload(source)
                    // Copy whole words back to front
                    // We use a signed comparisson here to allow dEnd to become
                    // negative (happens when source and dest < 32). Valid
                    // addresses in local memory will never be larger than
                    // 2**255, so they can be safely re-interpreted as signed.
                    // Note: the first check is always true,
                    // this could have been a do-while loop.
                    // solhint-disable-next-line no-empty-blocks
                    for {} slt(dest, dEnd) {} {
                        mstore(dEnd, mload(sEnd))
                        sEnd := sub(sEnd, 32)
                        dEnd := sub(dEnd, 32)
                    }
                    // Write the first 32 bytes
                    mstore(dest, first)
                }
            }
        }
    }
    /// @dev Returns a slices from a byte array.
    /// @param b The byte array to take a slice from.
    /// @param from The starting index for the slice (inclusive).
    /// @param to The final index for the slice (exclusive).
    /// @return result The slice containing bytes at indices [from, to)
    function slice(
        bytes memory b,
        uint256 from,
        uint256 to
    )
        internal
        pure
        returns (bytes memory result)
    {
        // Ensure that the from and to positions are valid positions for a slice within
        // the byte array that is being used.
        if (from > to) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.FromLessThanOrEqualsToRequired,
                from,
                to
            ));
        }
        if (to > b.length) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.ToLessThanOrEqualsLengthRequired,
                to,
                b.length
            ));
        }
        // Create a new bytes structure and copy contents
        result = new bytes(to - from);
        memCopy(
            result.contentAddress(),
            b.contentAddress() + from,
            result.length
        );
        return result;
    }
    /// @dev Returns a slice from a byte array without preserving the input.
    ///      When `from == 0`, the original array will match the slice.
    ///      In other cases its state will be corrupted.
    /// @param b The byte array to take a slice from. Will be destroyed in the process.
    /// @param from The starting index for the slice (inclusive).
    /// @param to The final index for the slice (exclusive).
    /// @return result The slice containing bytes at indices [from, to)
    function sliceDestructive(
        bytes memory b,
        uint256 from,
        uint256 to
    )
        internal
        pure
        returns (bytes memory result)
    {
        // Ensure that the from and to positions are valid positions for a slice within
        // the byte array that is being used.
        if (from > to) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.FromLessThanOrEqualsToRequired,
                from,
                to
            ));
        }
        if (to > b.length) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.ToLessThanOrEqualsLengthRequired,
                to,
                b.length
            ));
        }
        // Create a new bytes structure around [from, to) in-place.
        assembly {
            result := add(b, from)
            mstore(result, sub(to, from))
        }
        return result;
    }
    /// @dev Pops the last byte off of a byte array by modifying its length.
    /// @param b Byte array that will be modified.
    /// @return result The byte that was popped off.
    function popLastByte(bytes memory b)
        internal
        pure
        returns (bytes1 result)
    {
        if (b.length == 0) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.LengthGreaterThanZeroRequired,
                b.length,
                0
            ));
        }
        // Store last byte.
        result = b[b.length - 1];
        assembly {
            // Decrement length of byte array.
            let newLen := sub(mload(b), 1)
            mstore(b, newLen)
        }
        return result;
    }
    /// @dev Tests equality of two byte arrays.
    /// @param lhs First byte array to compare.
    /// @param rhs Second byte array to compare.
    /// @return equal True if arrays are the same. False otherwise.
    function equals(
        bytes memory lhs,
        bytes memory rhs
    )
        internal
        pure
        returns (bool equal)
    {
        // Keccak gas cost is 30 + numWords * 6. This is a cheap way to compare.
        // We early exit on unequal lengths, but keccak would also correctly
        // handle this.
        return lhs.length == rhs.length && keccak256(lhs) == keccak256(rhs);
    }
    /// @dev Reads an address from a position in a byte array.
    /// @param b Byte array containing an address.
    /// @param index Index in byte array of address.
    /// @return result address from byte array.
    function readAddress(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (address result)
    {
        if (b.length < index + 20) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsTwentyRequired,
                b.length,
                index + 20 // 20 is length of address
            ));
        }
        // Add offset to index:
        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
        index += 20;
        // Read address from array memory
        assembly {
            // 1. Add index to address of bytes array
            // 2. Load 32-byte word from memory
            // 3. Apply 20-byte mask to obtain address
            result := and(mload(add(b, index)), 0xffffffffffffffffffffffffffffffffffffffff)
        }
        return result;
    }
    /// @dev Writes an address into a specific position in a byte array.
    /// @param b Byte array to insert address into.
    /// @param index Index in byte array of address.
    /// @param input Address to put into byte array.
    function writeAddress(
        bytes memory b,
        uint256 index,
        address input
    )
        internal
        pure
    {
        if (b.length < index + 20) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsTwentyRequired,
                b.length,
                index + 20 // 20 is length of address
            ));
        }
        // Add offset to index:
        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
        index += 20;
        // Store address into array memory
        assembly {
            // The address occupies 20 bytes and mstore stores 32 bytes.
            // First fetch the 32-byte word where we'll be storing the address, then
            // apply a mask so we have only the bytes in the word that the address will not occupy.
            // Then combine these bytes with the address and store the 32 bytes back to memory with mstore.
            // 1. Add index to address of bytes array
            // 2. Load 32-byte word from memory
            // 3. Apply 12-byte mask to obtain extra bytes occupying word of memory where we'll store the address
            let neighbors := and(
                mload(add(b, index)),
                0xffffffffffffffffffffffff0000000000000000000000000000000000000000
            )
            // Make sure input address is clean.
            // (Solidity does not guarantee this)
            input := and(input, 0xffffffffffffffffffffffffffffffffffffffff)
            // Store the neighbors and address into memory
            mstore(add(b, index), xor(input, neighbors))
        }
    }
    /// @dev Reads a bytes32 value from a position in a byte array.
    /// @param b Byte array containing a bytes32 value.
    /// @param index Index in byte array of bytes32 value.
    /// @return result bytes32 value from byte array.
    function readBytes32(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (bytes32 result)
    {
        if (b.length < index + 32) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsThirtyTwoRequired,
                b.length,
                index + 32
            ));
        }
        // Arrays are prefixed by a 256 bit length parameter
        index += 32;
        // Read the bytes32 from array memory
        assembly {
            result := mload(add(b, index))
        }
        return result;
    }
    /// @dev Writes a bytes32 into a specific position in a byte array.
    /// @param b Byte array to insert <input> into.
    /// @param index Index in byte array of <input>.
    /// @param input bytes32 to put into byte array.
    function writeBytes32(
        bytes memory b,
        uint256 index,
        bytes32 input
    )
        internal
        pure
    {
        if (b.length < index + 32) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsThirtyTwoRequired,
                b.length,
                index + 32
            ));
        }
        // Arrays are prefixed by a 256 bit length parameter
        index += 32;
        // Read the bytes32 from array memory
        assembly {
            mstore(add(b, index), input)
        }
    }
    /// @dev Reads a uint256 value from a position in a byte array.
    /// @param b Byte array containing a uint256 value.
    /// @param index Index in byte array of uint256 value.
    /// @return result uint256 value from byte array.
    function readUint256(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (uint256 result)
    {
        result = uint256(readBytes32(b, index));
        return result;
    }
    /// @dev Writes a uint256 into a specific position in a byte array.
    /// @param b Byte array to insert <input> into.
    /// @param index Index in byte array of <input>.
    /// @param input uint256 to put into byte array.
    function writeUint256(
        bytes memory b,
        uint256 index,
        uint256 input
    )
        internal
        pure
    {
        writeBytes32(b, index, bytes32(input));
    }
    /// @dev Reads an unpadded bytes4 value from a position in a byte array.
    /// @param b Byte array containing a bytes4 value.
    /// @param index Index in byte array of bytes4 value.
    /// @return result bytes4 value from byte array.
    function readBytes4(
        bytes memory b,
        uint256 index
    )
        internal
        pure
        returns (bytes4 result)
    {
        if (b.length < index + 4) {
            LibRichErrorsV06.rrevert(LibBytesRichErrorsV06.InvalidByteOperationError(
                LibBytesRichErrorsV06.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsFourRequired,
                b.length,
                index + 4
            ));
        }
        // Arrays are prefixed by a 32 byte length field
        index += 32;
        // Read the bytes4 from array memory
        assembly {
            result := mload(add(b, index))
            // Solidity does not require us to clean the trailing bytes.
            // We do it anyway
            result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
        }
        return result;
    }
    /// @dev Writes a new length to a byte array.
    ///      Decreasing length will lead to removing the corresponding lower order bytes from the byte array.
    ///      Increasing length may lead to appending adjacent in-memory bytes to the end of the byte array.
    /// @param b Bytes array to write new length to.
    /// @param length New length of byte array.
    function writeLength(bytes memory b, uint256 length)
        internal
        pure
    {
        assembly {
            mstore(b, length)
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () internal {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
pragma solidity =0.6.6;
import "@openzeppelin/contracts/math/SafeMath.sol";
interface IPancakePair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);
    function MINIMUM_LIQUIDITY() external pure returns (uint256);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );
    function price0CumulativeLast() external view returns (uint256);
    function price1CumulativeLast() external view returns (uint256);
    function kLast() external view returns (uint256);
    function mint(address to) external returns (uint256 liquidity);
    function burn(address to) external returns (uint256 amount0, uint256 amount1);
    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;
    function skim(address to) external;
    function sync() external;
    function initialize(address, address) external;
}
library PancakeLibrary {
    using SafeMath for uint256;
    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB, "PancakeLibrary: IDENTICAL_ADDRESSES");
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), "PancakeLibrary: ZERO_ADDRESS");
    }
    // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) internal pure returns (uint256 amountB) {
        require(amountA > 0, "PancakeLibrary: INSUFFICIENT_AMOUNT");
        require(reserveA > 0 && reserveB > 0, "PancakeLibrary: INSUFFICIENT_LIQUIDITY");
        amountB = amountA.mul(reserveB) / reserveA;
    }
}
pragma solidity >=0.5.0;
interface IReferralRegistry {
    function getUserReferee(address _user) external view returns (address);
    function hasUserReferee(address _user) external view returns (bool);
    function createReferralAnchor(address _user, address _referee) external;
}
pragma solidity ^0.6.5;
interface IZerox {
    function getFunctionImplementation(bytes4 selector) external returns (address payable);
}
// SPDX-License-Identifier: Apache-2.0
/*
  Copyright 2020 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity ^0.6.5;
library LibBytesRichErrorsV06 {
    enum InvalidByteOperationErrorCodes {
        FromLessThanOrEqualsToRequired,
        ToLessThanOrEqualsLengthRequired,
        LengthGreaterThanZeroRequired,
        LengthGreaterThanOrEqualsFourRequired,
        LengthGreaterThanOrEqualsTwentyRequired,
        LengthGreaterThanOrEqualsThirtyTwoRequired,
        LengthGreaterThanOrEqualsNestedBytesLengthRequired,
        DestinationLengthGreaterThanOrEqualSourceLengthRequired
    }
    // bytes4(keccak256("InvalidByteOperationError(uint8,uint256,uint256)"))
    bytes4 internal constant INVALID_BYTE_OPERATION_ERROR_SELECTOR =
        0x28006595;
    // solhint-disable func-name-mixedcase
    function InvalidByteOperationError(
        InvalidByteOperationErrorCodes errorCode,
        uint256 offset,
        uint256 required
    )
        internal
        pure
        returns (bytes memory)
    {
        return abi.encodeWithSelector(
            INVALID_BYTE_OPERATION_ERROR_SELECTOR,
            errorCode,
            offset,
            required
        );
    }
}
// SPDX-License-Identifier: Apache-2.0
/*
  Copyright 2020 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity ^0.6.5;
library LibRichErrorsV06 {
    // bytes4(keccak256("Error(string)"))
    bytes4 internal constant STANDARD_ERROR_SELECTOR = 0x08c379a0;
    // solhint-disable func-name-mixedcase
    /// @dev ABI encode a standard, string revert error payload.
    ///      This is the same payload that would be included by a `revert(string)`
    ///      solidity statement. It has the function signature `Error(string)`.
    /// @param message The error string.
    /// @return The ABI encoded error.
    function StandardError(string memory message)
        internal
        pure
        returns (bytes memory)
    {
        return abi.encodeWithSelector(
            STANDARD_ERROR_SELECTOR,
            bytes(message)
        );
    }
    // solhint-enable func-name-mixedcase
    /// @dev Reverts an encoded rich revert reason `errorData`.
    /// @param errorData ABI encoded error data.
    function rrevert(bytes memory errorData)
        internal
        pure
    {
        assembly {
            revert(add(errorData, 0x20), mload(errorData))
        }
    }
}
pragma solidity =0.6.6;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "./libraries/TransferHelper.sol";
import "./libraries/PancakeLibrary.sol";
import "./interfaces/IReferralRegistry.sol";
import "./interfaces/IWETH.sol";
import "./interfaces/IZerox.sol";
contract FloozMultichainRouter is Ownable, Pausable, ReentrancyGuard {
    using SafeMath for uint256;
    event SwapFeeUpdated(uint16 swapFee);
    event ReferralRegistryUpdated(address referralRegistry);
    event ReferralRewardRateUpdated(uint16 referralRewardRate);
    event ReferralsActivatedUpdated(bool activated);
    event FeeReceiverUpdated(address payable feeReceiver);
    event CustomReferralRewardRateUpdated(address indexed account, uint16 referralRate);
    event ReferralRewardPaid(address from, address indexed to, address tokenOut, address tokenReward, uint256 amount);
    event ForkCreated(address factory);
    event ForkUpdated(address factory);
    struct SwapData {
        address fork;
        address referee;
        bool fee;
    }
    struct ExternalSwapData {
        bytes data;
        address fromToken;
        address toToken;
        uint256 amountFrom;
        address referee;
        uint256 minOut;
        bool fee;
    }
    // Denominator of fee
    uint256 public constant FEE_DENOMINATOR = 10000;
    // Numerator of fee
    uint16 public swapFee;
    // address of WETH
    address public immutable WETH;
    // address of zeroEx proxy contract to forward swaps
    address payable public immutable zeroEx;
    // address of 1inch contract to forward swaps
    address payable public immutable oneInch;
    // address of referral registry that stores referral anchors
    IReferralRegistry public referralRegistry;
    // address that receives protocol fees
    address payable public feeReceiver;
    // percentage of fees that will be paid as rewards
    uint16 public referralRewardRate;
    // stores if the referral system is turned on or off
    bool public referralsActivated;
    // stores individual referral rates
    mapping(address => uint16) public customReferralRewardRate;
    // stores uniswap forks status, index is the factory address
    mapping(address => bool) public forkActivated;
    // stores uniswap forks initCodes, index is the factory address
    mapping(address => bytes) public forkInitCode;
    /// @dev construct this contract
    /// @param _WETH address of WETH.
    /// @param _swapFee nominator for swapFee. Denominator = 10000
    /// @param _referralRewardRate percentage of swapFee that are paid out as rewards
    /// @param _feeReceiver address that receives protocol fees
    /// @param _referralRegistry address of referral registry that stores referral anchors
    /// @param _zeroEx address of zeroX proxy contract to forward swaps
    constructor(
        address _WETH,
        uint16 _swapFee,
        uint16 _referralRewardRate,
        address payable _feeReceiver,
        IReferralRegistry _referralRegistry,
        address payable _zeroEx,
        address payable _oneInch
    ) public {
        WETH = _WETH;
        swapFee = _swapFee;
        referralRewardRate = _referralRewardRate;
        feeReceiver = _feeReceiver;
        referralRegistry = _referralRegistry;
        zeroEx = _zeroEx;
        oneInch = _oneInch;
        referralsActivated = true;
    }
    /// @dev execute swap directly on Uniswap/Pancake & simular forks
    /// @param swapData stores the swapData information
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @return amounts
    function swapExactETHForTokens(
        SwapData calldata swapData,
        uint256 amountOutMin,
        address[] calldata path
    )
        external
        payable
        whenNotPaused
        isValidFork(swapData.fork)
        isValidReferee(swapData.referee)
        returns (uint256[] memory amounts)
    {
        require(path[0] == WETH, "FloozRouter: INVALID_PATH");
        address referee = _getReferee(swapData.referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            msg.value,
            referee,
            false
        );
        amounts = _getAmountsOut(swapData.fork, swapAmount, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(_pairFor(swapData.fork, path[0], path[1]), amounts[0]));
        _swap(swapData.fork, amounts, path, msg.sender);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountIn amount of tokensIn
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        SwapData calldata swapData,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path
    ) external whenNotPaused isValidFork(swapData.fork) isValidReferee(swapData.referee) {
        require(path[path.length - 1] == WETH, "FloozRouter: INVALID_PATH");
        address referee = _getReferee(swapData.referee);
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(swapData.fork, path[0], path[1]), amountIn);
        _swapSupportingFeeOnTransferTokens(swapData.fork, path, address(this));
        uint256 amountOut = IERC20(WETH).balanceOf(address(this));
        IWETH(WETH).withdraw(amountOut);
        (uint256 amountWithdraw, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amountOut,
            referee,
            false
        );
        require(amountWithdraw >= amountOutMin, "FloozRouter: LOW_SLIPPAGE");
        TransferHelper.safeTransferETH(msg.sender, amountWithdraw);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountIn amount if tokens In
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @return amounts
    function swapExactTokensForTokens(
        SwapData calldata swapData,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path
    )
        external
        whenNotPaused
        isValidFork(swapData.fork)
        isValidReferee(swapData.referee)
        returns (uint256[] memory amounts)
    {
        address referee = _getReferee(swapData.referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amountIn,
            referee,
            false
        );
        amounts = _getAmountsOut(swapData.fork, swapAmount, path);
        require(amounts[amounts.length - 1] >= amountOutMin, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(swapData.fork, path[0], path[1]), swapAmount);
        _swap(swapData.fork, amounts, path, msg.sender);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(path[0], path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountIn amount if tokens In
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    /// @return amounts
    function swapExactTokensForETH(
        SwapData calldata swapData,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path
    )
        external
        whenNotPaused
        isValidFork(swapData.fork)
        isValidReferee(swapData.referee)
        returns (uint256[] memory amounts)
    {
        require(path[path.length - 1] == WETH, "FloozRouter: INVALID_PATH");
        address referee = _getReferee(swapData.referee);
        amounts = _getAmountsOut(swapData.fork, amountIn, path);
        (uint256 amountWithdraw, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amounts[amounts.length - 1],
            referee,
            false
        );
        require(amountWithdraw >= amountOutMin, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(swapData.fork, path[0], path[1]), amounts[0]);
        _swap(swapData.fork, amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(msg.sender, amountWithdraw);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountOut expected amount of tokens out
    /// @param path Sell path.
    /// @return amounts
    function swapETHForExactTokens(
        SwapData calldata swapData,
        uint256 amountOut,
        address[] calldata path
    )
        external
        payable
        whenNotPaused
        isValidFork(swapData.fork)
        isValidReferee(swapData.referee)
        returns (uint256[] memory amounts)
    {
        require(path[0] == WETH, "FloozRouter: INVALID_PATH");
        address referee = _getReferee(swapData.referee);
        amounts = _getAmountsIn(swapData.fork, amountOut, path);
        (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amounts[0],
            referee,
            true
        );
        require(amounts[0].add(feeAmount).add(referralReward) <= msg.value, "FloozRouter: EXCESSIVE_INPUT_AMOUNT");
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(_pairFor(swapData.fork, path[0], path[1]), amounts[0]));
        _swap(swapData.fork, amounts, path, msg.sender);
        // refund dust eth, if any
        if (msg.value > amounts[0].add(feeAmount).add(referralReward))
            TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0].add(feeAmount).add(referralReward));
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountIn amount if tokens In
    /// @param amountOutMin minimum tokens to receive
    /// @param path Sell path.
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        SwapData calldata swapData,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path
    ) external whenNotPaused isValidFork(swapData.fork) isValidReferee(swapData.referee) {
        address referee = _getReferee(swapData.referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amountIn,
            referee,
            false
        );
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(swapData.fork, path[0], path[1]), swapAmount);
        uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(msg.sender);
        _swapSupportingFeeOnTransferTokens(swapData.fork, path, msg.sender);
        require(
            IERC20(path[path.length - 1]).balanceOf(msg.sender).sub(balanceBefore) >= amountOutMin,
            "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT"
        );
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(path[0], path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountOut expected tokens to receive
    /// @param amountInMax maximum tokens to send
    /// @param path Sell path.
    /// @return amounts
    function swapTokensForExactTokens(
        SwapData calldata swapData,
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path
    )
        external
        whenNotPaused
        isValidFork(swapData.fork)
        isValidReferee(swapData.referee)
        returns (uint256[] memory amounts)
    {
        address referee = _getReferee(swapData.referee);
        amounts = _getAmountsIn(swapData.fork, amountOut, path);
        (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amounts[0],
            referee,
            true
        );
        require(amounts[0].add(feeAmount).add(referralReward) <= amountInMax, "FloozRouter: EXCESSIVE_INPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(swapData.fork, path[0], path[1]), amounts[0]);
        _swap(swapData.fork, amounts, path, msg.sender);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(path[0], path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountOut expected tokens to receive
    /// @param amountInMax maximum tokens to send
    /// @param path Sell path.
    /// @return amounts
    function swapTokensForExactETH(
        SwapData calldata swapData,
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path
    )
        external
        whenNotPaused
        isValidFork(swapData.fork)
        isValidReferee(swapData.referee)
        returns (uint256[] memory amounts)
    {
        require(path[path.length - 1] == WETH, "FloozRouter: INVALID_PATH");
        address referee = _getReferee(swapData.referee);
        (, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            amountOut,
            referee,
            true
        );
        amounts = _getAmountsIn(swapData.fork, amountOut.add(feeAmount).add(referralReward), path);
        require(amounts[0].add(feeAmount).add(referralReward) <= amountInMax, "FloozRouter: EXCESSIVE_INPUT_AMOUNT");
        TransferHelper.safeTransferFrom(path[0], msg.sender, _pairFor(swapData.fork, path[0], path[1]), amounts[0]);
        _swap(swapData.fork, amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(msg.sender, amountOut);
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev execute swap directly on Uniswap/Pancake/...
    /// @param swapData stores the swapData information
    /// @param amountOutMin minimum expected tokens to receive
    /// @param path Sell path.
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        SwapData calldata swapData,
        uint256 amountOutMin,
        address[] calldata path
    ) external payable whenNotPaused isValidFork(swapData.fork) isValidReferee(swapData.referee) {
        require(path[0] == WETH, "FloozRouter: INVALID_PATH");
        address referee = _getReferee(swapData.referee);
        (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
            swapData.fee,
            msg.value,
            referee,
            false
        );
        IWETH(WETH).deposit{value: swapAmount}();
        assert(IWETH(WETH).transfer(_pairFor(swapData.fork, path[0], path[1]), swapAmount));
        uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(msg.sender);
        _swapSupportingFeeOnTransferTokens(swapData.fork, path, msg.sender);
        require(
            IERC20(path[path.length - 1]).balanceOf(msg.sender).sub(balanceBefore) >= amountOutMin,
            "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT"
        );
        if (feeAmount.add(referralReward) > 0)
            _withdrawFeesAndRewards(address(0), path[path.length - 1], referee, feeAmount, referralReward);
    }
    /// @dev returns the referee for a given address, if new, registers referee
    /// @param referee the address of the referee for msg.sender
    /// @return referee address from referral registry
    function _getReferee(address referee) internal returns (address) {
        address sender = msg.sender;
        if (!referralRegistry.hasUserReferee(sender) && referee != address(0)) {
            referralRegistry.createReferralAnchor(sender, referee);
        }
        return referralRegistry.getUserReferee(sender);
    }
    // **** SWAP ****
    // requires the initial amount to have already been sent to the first pair
    function _swap(
        address fork,
        uint256[] memory amounts,
        address[] memory path,
        address _to
    ) internal {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = PancakeLibrary.sortTokens(input, output);
            uint256 amountOut = amounts[i + 1];
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOut)
                : (amountOut, uint256(0));
            address to = i < path.length - 2 ? _pairFor(fork, output, path[i + 2]) : _to;
            IPancakePair(_pairFor(fork, input, output)).swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
    // **** SWAP (supporting fee-on-transfer tokens) ****
    // requires the initial amount to have already been sent to the first pair
    function _swapSupportingFeeOnTransferTokens(
        address fork,
        address[] memory path,
        address _to
    ) internal {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = PancakeLibrary.sortTokens(input, output);
            IPancakePair pair = IPancakePair(_pairFor(fork, input, output));
            uint256 amountInput;
            uint256 amountOutput;
            {
                // scope to avoid stack too deep errors
                (uint256 reserve0, uint256 reserve1, ) = pair.getReserves();
                (uint256 reserveInput, uint256 reserveOutput) = input == token0
                    ? (reserve0, reserve1)
                    : (reserve1, reserve0);
                amountInput = IERC20(input).balanceOf(address(pair)).sub(reserveInput);
                amountOutput = _getAmountOut(amountInput, reserveInput, reserveOutput);
            }
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOutput)
                : (amountOutput, uint256(0));
            address to = i < path.length - 2 ? _pairFor(fork, output, path[i + 2]) : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
    /// @dev Executes a swap on 1inch
    /// @param swapData encoded swap data
    function executeOneInchSwap(ExternalSwapData calldata swapData)
        external
        payable
        nonReentrant
        whenNotPaused
        isValidReferee(swapData.referee)
    {
        address referee = _getReferee(swapData.referee);
        uint256 balanceBefore;
        if (swapData.toToken == address(0)) {
            balanceBefore = msg.sender.balance;
        } else {
            balanceBefore = IERC20(swapData.toToken).balanceOf(msg.sender);
        }
        if (!swapData.fee) {
            // execute without fees
            if (swapData.fromToken != address(0)) {
                IERC20(swapData.fromToken).transferFrom(msg.sender, address(this), swapData.amountFrom);
                IERC20(swapData.fromToken).approve(oneInch, swapData.amountFrom);
            }
            // executes trade and sends toToken to defined recipient
            (bool success, ) = address(oneInch).call{value: msg.value}(swapData.data);
            require(success, "FloozRouter: REVERTED");
        } else {
            // Swap from ETH
            if (msg.value > 0 && swapData.fromToken == address(0)) {
                (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
                    swapData.fee,
                    msg.value,
                    referee,
                    false
                );
                (bool success, ) = address(oneInch).call{value: swapAmount}(swapData.data);
                require(success, "FloozRouter: REVERTED");
                _withdrawFeesAndRewards(address(0), swapData.toToken, referee, feeAmount, referralReward);
                // Swap from token
            } else {
                (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
                    swapData.fee,
                    swapData.amountFrom,
                    referee,
                    false
                );
                IERC20(swapData.fromToken).transferFrom(msg.sender, address(this), swapAmount);
                IERC20(swapData.fromToken).approve(oneInch, swapAmount);
                (bool success, ) = address(oneInch).call(swapData.data);
                require(success, "FloozRouter: REVERTED");
                _withdrawFeesAndRewards(swapData.fromToken, swapData.toToken, referee, feeAmount, referralReward);
            }
            uint256 balanceAfter;
            if (swapData.toToken == address(0)) {
                balanceAfter = msg.sender.balance;
            } else {
                balanceAfter = IERC20(swapData.toToken).balanceOf(msg.sender);
            }
            require(balanceAfter.sub(balanceBefore) >= swapData.minOut, "FloozRouter: INSUFFICIENT_OUTPUT");
        }
    }
    /// @dev Executes a swap on 0x
    /// @param swapData encoded swap data
    function executeZeroExSwap(ExternalSwapData calldata swapData)
        external
        payable
        nonReentrant
        whenNotPaused
        isValidReferee(swapData.referee)
    {
        address referee = _getReferee(swapData.referee);
        uint256 balanceBefore;
        if (swapData.toToken == address(0)) {
            balanceBefore = msg.sender.balance;
        } else {
            balanceBefore = IERC20(swapData.toToken).balanceOf(msg.sender);
        }
        if (!swapData.fee) {
            if (msg.value > 0 && swapData.fromToken == address(0)) {
                (bool success, ) = zeroEx.call{value: msg.value}(swapData.data);
                require(success, "FloozRouter: REVERTED");
                TransferHelper.safeTransfer(
                    swapData.toToken,
                    msg.sender,
                    IERC20(swapData.toToken).balanceOf(address(this))
                );
            } else {
                IERC20(swapData.fromToken).transferFrom(msg.sender, address(this), swapData.amountFrom);
                IERC20(swapData.fromToken).approve(zeroEx, swapData.amountFrom);
                (bool success, ) = zeroEx.call(swapData.data);
                require(success, "FloozRouter: REVERTED");
                if (swapData.toToken == address(0)) {
                    TransferHelper.safeTransferETH(msg.sender, address(this).balance);
                } else {
                    TransferHelper.safeTransfer(
                        swapData.toToken,
                        msg.sender,
                        IERC20(swapData.toToken).balanceOf(address(this))
                    );
                }
            }
        } else {
            // Swap from ETH
            if (msg.value > 0 && swapData.fromToken == address(0)) {
                (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
                    swapData.fee,
                    msg.value,
                    referee,
                    false
                );
                (bool success, ) = zeroEx.call{value: swapAmount}(swapData.data);
                require(success, "FloozRouter: REVERTED");
                TransferHelper.safeTransfer(
                    swapData.toToken,
                    msg.sender,
                    IERC20(swapData.toToken).balanceOf(address(this))
                );
                _withdrawFeesAndRewards(address(0), swapData.toToken, referee, feeAmount, referralReward);
                // Swap from Token
            } else {
                (uint256 swapAmount, uint256 feeAmount, uint256 referralReward) = _calculateFeesAndRewards(
                    swapData.fee,
                    swapData.amountFrom,
                    referee,
                    false
                );
                IERC20(swapData.fromToken).transferFrom(msg.sender, address(this), swapAmount);
                IERC20(swapData.fromToken).approve(zeroEx, swapAmount);
                (bool success, ) = zeroEx.call(swapData.data);
                require(success, "FloozRouter: REVERTED");
                if (swapData.toToken == address(0)) {
                    TransferHelper.safeTransferETH(msg.sender, address(this).balance);
                } else {
                    TransferHelper.safeTransfer(
                        swapData.toToken,
                        msg.sender,
                        IERC20(swapData.toToken).balanceOf(address(this))
                    );
                }
                _withdrawFeesAndRewards(swapData.fromToken, swapData.toToken, referee, feeAmount, referralReward);
            }
        }
        uint256 balanceAfter;
        if (swapData.toToken == address(0)) {
            balanceAfter = msg.sender.balance;
        } else {
            balanceAfter = IERC20(swapData.toToken).balanceOf(msg.sender);
        }
        require(balanceAfter.sub(balanceBefore) >= swapData.minOut, "FloozRouter: INSUFFICIENT_OUTPUT");
    }
    /// @dev calculates swap, fee & reward amounts
    /// @param fee boolean if fee will be applied or not
    /// @param amount total amount of tokens
    /// @param referee the address of the referee for msg.sender
    function _calculateFeesAndRewards(
        bool fee,
        uint256 amount,
        address referee,
        bool additiveFee
    )
        internal
        view
        returns (
            uint256 swapAmount,
            uint256 feeAmount,
            uint256 referralReward
        )
    {
        uint16 swapFee = swapFee;
        // no fees for users above threshold
        if (!fee) {
            swapAmount = amount;
        } else {
            if (additiveFee) {
                swapAmount = amount;
                feeAmount = swapAmount.mul(FEE_DENOMINATOR).div(FEE_DENOMINATOR.sub(swapFee)).sub(amount);
            } else {
                feeAmount = amount.mul(swapFee).div(FEE_DENOMINATOR);
                swapAmount = amount.sub(feeAmount);
            }
            // calculate referral rates, if referee is not 0x
            if (referee != address(0) && referralsActivated) {
                uint16 referralRate = customReferralRewardRate[referee] > 0
                    ? customReferralRewardRate[referee]
                    : referralRewardRate;
                referralReward = feeAmount.mul(referralRate).div(FEE_DENOMINATOR);
                feeAmount = feeAmount.sub(referralReward);
            } else {
                referralReward = 0;
            }
        }
    }
    /// @dev lets the admin register an Uniswap style fork
    function registerFork(address _factory, bytes calldata _initCode) external onlyOwner {
        require(!forkActivated[_factory], "FloozRouter: ACTIVE_FORK");
        forkActivated[_factory] = true;
        forkInitCode[_factory] = _initCode;
        emit ForkCreated(_factory);
    }
    /// @dev lets the admin update an Uniswap style fork
    function updateFork(
        address _factory,
        bytes calldata _initCode,
        bool _activated
    ) external onlyOwner {
        forkActivated[_factory] = _activated;
        forkInitCode[_factory] = _initCode;
        emit ForkUpdated(_factory);
    }
    /// @dev lets the admin update the swapFee nominator
    function updateSwapFee(uint16 newSwapFee) external onlyOwner {
        swapFee = newSwapFee;
        emit SwapFeeUpdated(newSwapFee);
    }
    /// @dev lets the admin update the referral reward rate
    function updateReferralRewardRate(uint16 newReferralRewardRate) external onlyOwner {
        require(newReferralRewardRate <= FEE_DENOMINATOR, "FloozRouter: INVALID_RATE");
        referralRewardRate = newReferralRewardRate;
        emit ReferralRewardRateUpdated(newReferralRewardRate);
    }
    /// @dev lets the admin update which address receives the protocol fees
    function updateFeeReceiver(address payable newFeeReceiver) external onlyOwner {
        feeReceiver = newFeeReceiver;
        emit FeeReceiverUpdated(newFeeReceiver);
    }
    /// @dev lets the admin update the status of the referral system
    function updateReferralsActivated(bool newReferralsActivated) external onlyOwner {
        referralsActivated = newReferralsActivated;
        emit ReferralsActivatedUpdated(newReferralsActivated);
    }
    /// @dev lets the admin set a new referral registry
    function updateReferralRegistry(address newReferralRegistry) external onlyOwner {
        referralRegistry = IReferralRegistry(newReferralRegistry);
        emit ReferralRegistryUpdated(newReferralRegistry);
    }
    /// @dev lets the admin set a custom referral rate
    function updateCustomReferralRewardRate(address account, uint16 referralRate) external onlyOwner returns (uint256) {
        require(referralRate <= FEE_DENOMINATOR, "FloozRouter: INVALID_RATE");
        customReferralRewardRate[account] = referralRate;
        emit CustomReferralRewardRateUpdated(account, referralRate);
    }
    /// @dev returns the referee for a given user - 0x address if none
    function getUserReferee(address user) external view returns (address) {
        return referralRegistry.getUserReferee(user);
    }
    /// @dev returns if the given user has been referred or not
    function hasUserReferee(address user) external view returns (bool) {
        return referralRegistry.hasUserReferee(user);
    }
    /// @dev lets the admin withdraw ETH from the contract.
    function withdrawETH(address payable to, uint256 amount) external onlyOwner {
        TransferHelper.safeTransferETH(to, amount);
    }
    /// @dev lets the admin withdraw ERC20s from the contract.
    function withdrawERC20Token(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        TransferHelper.safeTransfer(token, to, amount);
    }
    /// @dev distributes fees & referral rewards to users
    function _withdrawFeesAndRewards(
        address tokenReward,
        address tokenOut,
        address referee,
        uint256 feeAmount,
        uint256 referralReward
    ) internal {
        if (tokenReward == address(0)) {
            TransferHelper.safeTransferETH(feeReceiver, feeAmount);
            if (referralReward > 0) {
                TransferHelper.safeTransferETH(referee, referralReward);
                emit ReferralRewardPaid(msg.sender, referee, tokenOut, tokenReward, referralReward);
            }
        } else {
            TransferHelper.safeTransferFrom(tokenReward, msg.sender, feeReceiver, feeAmount);
            if (referralReward > 0) {
                TransferHelper.safeTransferFrom(tokenReward, msg.sender, referee, referralReward);
                emit ReferralRewardPaid(msg.sender, referee, tokenOut, tokenReward, referralReward);
            }
        }
    }
    /// @dev given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function _getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountOut) {
        require(amountIn > 0, "FloozRouter: INSUFFICIENT_INPUT_AMOUNT");
        require(reserveIn > 0 && reserveOut > 0, "FloozRouter: INSUFFICIENT_LIQUIDITY");
        uint256 amountInWithFee = amountIn.mul((9970));
        uint256 numerator = amountInWithFee.mul(reserveOut);
        uint256 denominator = reserveIn.mul(10000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }
    /// @dev given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function _getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountIn) {
        require(amountOut > 0, "FloozRouter: INSUFFICIENT_OUTPUT_AMOUNT");
        require(reserveIn > 0 && reserveOut > 0, "FloozRouter: INSUFFICIENT_LIQUIDITY");
        uint256 numerator = reserveIn.mul(amountOut).mul(10000);
        uint256 denominator = reserveOut.sub(amountOut).mul(9970);
        amountIn = (numerator / denominator).add(1);
    }
    /// @dev performs chained getAmountOut calculations on any number of pairs
    function _getAmountsOut(
        address fork,
        uint256 amountIn,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2, "FloozRouter: INVALID_PATH");
        amounts = new uint256[](path.length);
        amounts[0] = amountIn;
        for (uint256 i; i < path.length - 1; i++) {
            (uint256 reserveIn, uint256 reserveOut) = _getReserves(fork, path[i], path[i + 1]);
            amounts[i + 1] = _getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }
    /// @dev performs chained getAmountIn calculations on any number of pairs
    function _getAmountsIn(
        address factory,
        uint256 amountOut,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2, "FloozRouter: INVALID_PATH");
        amounts = new uint256[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint256 i = path.length - 1; i > 0; i--) {
            (uint256 reserveIn, uint256 reserveOut) = _getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = _getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
    /// @dev fetches and sorts the reserves for a pair
    function _getReserves(
        address factory,
        address tokenA,
        address tokenB
    ) internal view returns (uint256 reserveA, uint256 reserveB) {
        (address token0, ) = PancakeLibrary.sortTokens(tokenA, tokenB);
        (uint256 reserve0, uint256 reserve1, ) = IPancakePair(_pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }
    /// @dev calculates the CREATE2 address for a pair without making any external calls
    function _pairFor(
        address factory,
        address tokenA,
        address tokenB
    ) internal view returns (address pair) {
        (address token0, address token1) = PancakeLibrary.sortTokens(tokenA, tokenB);
        pair = address(
            uint256(
                keccak256(
                    abi.encodePacked(
                        hex"ff",
                        factory,
                        keccak256(abi.encodePacked(token0, token1)),
                        forkInitCode[factory] // init code hash
                    )
                )
            )
        );
    }
    /// @dev lets the admin pause this contract
    function pause() external onlyOwner {
        _pause();
    }
    /// @dev lets the admin unpause this contract
    function unpause() external onlyOwner {
        _unpause();
    }
    /// @dev allows to receive ETH on the contract
    receive() external payable {}
    modifier isValidFork(address factory) {
        require(forkActivated[factory], "FloozRouter: INVALID_FACTORY");
        _;
    }
    modifier isValidReferee(address referee) {
        require(msg.sender != referee, "FloozRouter: SELF_REFERRAL");
        _;
    }
}
pragma solidity =0.6.6;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./libraries/TransferHelper.sol";
import "./interfaces/IWETH.sol";
contract FeeReceiverMultichain is Ownable {
    address public WETH;
    constructor(address _WETH) public {
        WETH = _WETH;
    }
    /// @dev converts WETH to ETH
    function unwrapWETH() public {
        uint256 balance = IWETH(WETH).balanceOf(address(this));
        require(balance > 0, "FeeReceiver: Nothing to unwrap");
        IWETH(WETH).withdraw(balance);
    }
    /// @dev lets the owner withdraw ETH from the contract
    function withdrawETH(address payable to, uint256 amount) external onlyOwner {
        to.transfer(amount);
    }
    /// @dev lets the owner withdraw any ERC20 Token from the contract
    function withdrawERC20Token(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        IERC20(token).transfer(to, amount);
    }
    /// @dev allows to receive ETH on this contract
    receive() external payable {}
}
pragma solidity =0.6.6;
import "@openzeppelin/contracts/access/Ownable.sol";
contract ReferralRegistry is Ownable {
    event ReferralAnchorCreated(address indexed user, address indexed referee);
    event ReferralAnchorUpdated(address indexed user, address indexed referee);
    event AnchorManagerUpdated(address account, bool isManager);
    // stores addresses which are allowed to create new anchors
    mapping(address => bool) public isAnchorManager;
    // stores the address that referred a given user
    mapping(address => address) public referralAnchor;
    /// @dev create a new referral anchor on the registry
    /// @param _user address of the user
    /// @param _referee address wich referred the user
    function createReferralAnchor(address _user, address _referee) external onlyAnchorManager {
        require(referralAnchor[_user] == address(0), "ReferralRegistry: ANCHOR_EXISTS");
        referralAnchor[_user] = _referee;
        emit ReferralAnchorCreated(_user, _referee);
    }
    /// @dev allows admin to overwrite anchor
    /// @param _user address of the user
    /// @param _referee address wich referred the user
    function updateReferralAnchor(address _user, address _referee) external onlyOwner {
        referralAnchor[_user] = _referee;
        emit ReferralAnchorUpdated(_user, _referee);
    }
    /// @dev allows admin to grant/remove anchor priviliges
    /// @param _anchorManager address of the anchor manager
    /// @param _isManager add or remove privileges
    function updateAnchorManager(address _anchorManager, bool _isManager) external onlyOwner {
        isAnchorManager[_anchorManager] = _isManager;
        emit AnchorManagerUpdated(_anchorManager, _isManager);
    }
    function getUserReferee(address _user) external view returns (address) {
        return referralAnchor[_user];
    }
    function hasUserReferee(address _user) external view returns (bool) {
        return referralAnchor[_user] != address(0);
    }
    modifier onlyAnchorManager() {
        require(isAnchorManager[msg.sender], "ReferralRegistry: FORBIDDEN");
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
pragma solidity =0.6.6;
import "@openzeppelin/contracts/access/Ownable.sol";
contract ReferralRegistry is Ownable {
    event ReferralAnchorCreated(address indexed user, address indexed referee);
    event ReferralAnchorUpdated(address indexed user, address indexed referee);
    event AnchorManagerUpdated(address account, bool isManager);
    // stores addresses which are allowed to create new anchors
    mapping(address => bool) public isAnchorManager;
    // stores the address that referred a given user
    mapping(address => address) public referralAnchor;
    /// @dev create a new referral anchor on the registry
    /// @param _user address of the user
    /// @param _referee address wich referred the user
    function createReferralAnchor(address _user, address _referee) external onlyAnchorManager {
        require(referralAnchor[_user] == address(0), "ReferralRegistry: ANCHOR_EXISTS");
        referralAnchor[_user] = _referee;
        emit ReferralAnchorCreated(_user, _referee);
    }
    /// @dev allows admin to overwrite anchor
    /// @param _user address of the user
    /// @param _referee address wich referred the user
    function updateReferralAnchor(address _user, address _referee) external onlyOwner {
        referralAnchor[_user] = _referee;
        emit ReferralAnchorUpdated(_user, _referee);
    }
    /// @dev allows admin to grant/remove anchor priviliges
    /// @param _anchorManager address of the anchor manager
    /// @param _isManager add or remove privileges
    function updateAnchorManager(address _anchorManager, bool _isManager) external onlyOwner {
        isAnchorManager[_anchorManager] = _isManager;
        emit AnchorManagerUpdated(_anchorManager, _isManager);
    }
    function getUserReferee(address _user) external view returns (address) {
        return referralAnchor[_user];
    }
    function hasUserReferee(address _user) external view returns (bool) {
        return referralAnchor[_user] != address(0);
    }
    modifier onlyAnchorManager() {
        require(isAnchorManager[msg.sender], "ReferralRegistry: FORBIDDEN");
        _;
    }
}

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.4.18;

contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed src, address indexed guy, uint wad);
    event  Transfer(address indexed src, address indexed dst, uint wad);
    event  Deposit(address indexed dst, uint wad);
    event  Withdrawal(address indexed src, uint wad);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        returns (bool)
    {
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
}


/*
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The GNU General Public License is a free, copyleft license for
software and other kinds of works.

  The licenses for most software and other practical works are designed
to take away your freedom to share and change the works.  By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users.  We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors.  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.

  To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights.  Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.

  For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received.  You must make sure that they, too, receive
or can get the source code.  And you must show them these terms so they
know their rights.

  Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.

  For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software.  For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.

  Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so.  This is fundamentally incompatible with the aim of
protecting users' freedom to change the software.  The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable.  Therefore, we
have designed this version of the GPL to prohibit the practice for those
products.  If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.

  Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary.  To prevent this, the GPL assures that
patents cannot be used to render the program non-free.

  The precise terms and conditions for copying, distribution and
modification follow.

                       TERMS AND CONDITIONS

  0. Definitions.

  "This License" refers to version 3 of the GNU General Public License.

  "Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.

  "The Program" refers to any copyrightable work licensed under this
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            How to Apply These Terms to Your New Programs

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possible use to the public, the best way to achieve this is to make it
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Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
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The hypothetical commands `show w' and `show c' should show the appropriate
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  You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
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Public License instead of this License.  But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

*/

// File: contracts/interfaces/IUniswapV2Pair.sol

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// File: contracts/interfaces/IUniswapV2ERC20.sol

pragma solidity >=0.5.0;

interface IUniswapV2ERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}

// File: contracts/libraries/SafeMath.sol

pragma solidity =0.5.16;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}

// File: contracts/UniswapV2ERC20.sol

pragma solidity =0.5.16;



contract UniswapV2ERC20 is IUniswapV2ERC20 {
    using SafeMath for uint;

    string public constant name = 'Uniswap V2';
    string public constant symbol = 'UNI-V2';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    constructor() public {
        uint chainId;
        assembly {
            chainId := chainid
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes(name)),
                keccak256(bytes('1')),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'UniswapV2: EXPIRED');
        bytes32 digest = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

// File: contracts/libraries/Math.sol

pragma solidity =0.5.16;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

// File: contracts/libraries/UQ112x112.sol

pragma solidity =0.5.16;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}

// File: contracts/interfaces/IERC20.sol

pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

// File: contracts/interfaces/IUniswapV2Factory.sol

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// File: contracts/interfaces/IUniswapV2Callee.sol

pragma solidity >=0.5.0;

interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

// File: contracts/UniswapV2Pair.sol

pragma solidity =0.5.16;








contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0;           // uses single storage slot, accessible via getReserves
    uint112 private reserve1;           // uses single storage slot, accessible via getReserves
    uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'UniswapV2: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IUniswapV2Factory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                uint rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint denominator = rootK.mul(5).add(rootKLast);
                    uint liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
           _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
        if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
        uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

/**
 *
 *
 *
 *  █████████  █████       ███  █████                         █████      ███ 
 * ███░░░░░███░░███       ░░░  ░░███                         ░░███      ░░░  
 *░███    ░░░  ░███████   ████  ░███████  ████████    ██████  ░███████  ████ 
 *░░█████████  ░███░░███ ░░███  ░███░░███░░███░░███  ███░░███ ░███░░███░░███ 
 * ░░░░░░░░███ ░███ ░███  ░███  ░███ ░███ ░███ ░███ ░███ ░███ ░███ ░███ ░███ 
 * ███    ░███ ░███ ░███  ░███  ░███ ░███ ░███ ░███ ░███ ░███ ░███ ░███ ░███ 
 *░░█████████  ████ █████ █████ ████████  ████ █████░░██████  ████████  █████
 * ░░░░░░░░░  ░░░░ ░░░░░ ░░░░░ ░░░░░░░░  ░░░░ ░░░░░  ░░░░░░  ░░░░░░░░  ░░░░░ 
 *                                                                           
 *                                                                           
*/                                                                           

// Shibnobi ETH
// Version: 20211106001
// Website: www.shibnobi.com
// Twitter: https://twitter.com/Shib_nobi (@Shib_nobi)
// TG: https://t.me/ShibnobiCommunity
// Facebook: https://www.facebook.com/Shibnobi
// Instagram: https://www.instagram.com/shibnobi/
// Medium: https://medium.com/@Shibnobi
// Reddit: https://www.reddit.com/r/Shibnobi/

pragma solidity ^0.8.9;
// SPDX-License-Identifier: Unlicensed
interface IERC20 {

    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}



/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
 
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

abstract contract Context {
    //function _msgSender() internal view virtual returns (address payable) {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;
    address private _previousOwner;
    uint256 private _lockTime;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

     /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    function geUnlockTime() public view returns (uint256) {
        return _lockTime;
    }

    //Locks the contract for owner for the amount of time provided
    function lock(uint256 time) public virtual onlyOwner {
        _previousOwner = _owner;
        _owner = address(0);
        _lockTime = block.timestamp + time;
        emit OwnershipTransferred(_owner, address(0));
    }
    
    //Unlocks the contract for owner when _lockTime is exceeds
    function unlock() public virtual {
        require(_previousOwner == msg.sender, "You don't have permission to unlock");
        require(block.timestamp > _lockTime , "Contract is locked until 7 days");
        emit OwnershipTransferred(_owner, _previousOwner);
        _owner = _previousOwner;
    }
}


interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}



interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}


interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}




interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

interface IAirdrop {
    function airdrop(address recipient, uint256 amount) external;
}

contract Shibnobi is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;

    mapping (address => bool) private _isExcludedFromFee;

    mapping (address => bool) private _isExcluded;
    address[] private _excluded;
    
    mapping (address => bool) private botWallets;
    bool botscantrade = false;
    
    bool public canTrade = false;
   
    uint256 private constant MAX = ~uint256(0);
    uint256 private _tTotal = 69000000000000000000000 * 10**9;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;
    address public marketingWallet;

    string private _name = "Shibnobi";
    string private _symbol = "SHINJA";
    uint8 private _decimals = 9;
    
    uint256 public _taxFee = 5;
    uint256 private _previousTaxFee = _taxFee;

    uint256 public marketingFeePercent = 38;
    
    uint256 public _liquidityFee = 8;
    uint256 private _previousLiquidityFee = _liquidityFee;

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    
    uint256 public _maxTxAmount = 690000000000000000000 * 10**9;
    uint256 public numTokensSellToAddToLiquidity = 690000000000000000000 * 10**9;
    
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    
    constructor () {
        _rOwned[_msgSender()] = _rTotal;
        
        //IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E); //Mainnet BSC
        //IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3); //Testnet BSC
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); //Mainnet & Testnet ETH
         // Create a uniswap pair for this new token
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        // set the rest of the contract variables
        uniswapV2Router = _uniswapV2Router;
        
        //exclude owner and this contract from fee
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        
        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcluded[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[account]);
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function totalFees() public view returns (uint256) {
        return _tFeeTotal;
    }
    
    function airdrop(address recipient, uint256 amount) external onlyOwner() {
        removeAllFee();
        _transfer(_msgSender(), recipient, amount * 10**9);
        restoreAllFee();
    }
    
    function airdropInternal(address recipient, uint256 amount) internal {
        removeAllFee();
        _transfer(_msgSender(), recipient, amount);
        restoreAllFee();
    }
    
    function airdropArray(address[] calldata newholders, uint256[] calldata amounts) external onlyOwner(){
        uint256 iterator = 0;
        require(newholders.length == amounts.length, "must be the same length");
        while(iterator < newholders.length){
            airdropInternal(newholders[iterator], amounts[iterator] * 10**9);
            iterator += 1;
        }
    }

    function deliver(uint256 tAmount) public {
        address sender = _msgSender();
        require(!_isExcluded[sender], "Excluded addresses cannot call this function");
        (uint256 rAmount,,,,,) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rTotal = _rTotal.sub(rAmount);
        _tFeeTotal = _tFeeTotal.add(tAmount);
    }

    function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferFee) {
            (uint256 rAmount,,,,,) = _getValues(tAmount);
            return rAmount;
        } else {
            (,uint256 rTransferAmount,,,,) = _getValues(tAmount);
            return rTransferAmount;
        }
    }

    function tokenFromReflection(uint256 rAmount) public view returns(uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate =  _getRate();
        return rAmount.div(currentRate);
    }

    function excludeFromReward(address account) public onlyOwner() {
        // require(account != 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, 'We can not exclude Uniswap router.');
        require(!_isExcluded[account], "Account is already excluded");
        if(_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isExcluded[account] = true;
        _excluded.push(account);
    }

    function includeInReward(address account) external onlyOwner() {
        require(_isExcluded[account], "Account is already excluded");
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_excluded[i] == account) {
                _excluded[i] = _excluded[_excluded.length - 1];
                _tOwned[account] = 0;
                _isExcluded[account] = false;
                _excluded.pop();
                break;
            }
        }
    }
        function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);        
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }
    
    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }
    
    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }
    function setMarketingFeePercent(uint256 fee) public onlyOwner {
        require(fee < 50, "Marketing fee cannot be more than 50% of liquidity");
        marketingFeePercent = fee;
    }

    function setMarketingWallet(address walletAddress) public onlyOwner {
        marketingWallet = walletAddress;
    }
    
    function setTaxFeePercent(uint256 taxFee) external onlyOwner() {
        require(taxFee < 10, "Tax fee cannot be more than 10%");
        _taxFee = taxFee;
    }
    
    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {
        _liquidityFee = liquidityFee;
    }
   
    function setMaxTxAmount(uint256 maxTxAmount) external onlyOwner() {
        require(maxTxAmount > 69000000, "Max Tx Amount cannot be less than 69 Million");
        _maxTxAmount = maxTxAmount * 10**9;
    }
    
    function setSwapThresholdAmount(uint256 SwapThresholdAmount) external onlyOwner() {
        require(SwapThresholdAmount > 69000000, "Swap Threshold Amount cannot be less than 69 Million");
        numTokensSellToAddToLiquidity = SwapThresholdAmount * 10**9;
    }
    
    function claimTokens () public onlyOwner {
        // make sure we capture all BNB that may or may not be sent to this contract
        payable(marketingWallet).transfer(address(this).balance);
    }
    
    function claimOtherTokens(IERC20 tokenAddress, address walletaddress) external onlyOwner() {
        tokenAddress.transfer(walletaddress, tokenAddress.balanceOf(address(this)));
    }
    
    function clearStuckBalance (address payable walletaddress) external onlyOwner() {
        walletaddress.transfer(address(this).balance);
    }
    
    function addBotWallet(address botwallet) external onlyOwner() {
        botWallets[botwallet] = true;
    }
    
    function removeBotWallet(address botwallet) external onlyOwner() {
        botWallets[botwallet] = false;
    }
    
    function getBotWalletStatus(address botwallet) public view returns (bool) {
        return botWallets[botwallet];
    }
    
    function allowtrading()external onlyOwner() {
        canTrade = true;
    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }
    
     //to recieve ETH from uniswapV2Router when swaping
    receive() external payable {}

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, _getRate());
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity);
    }

    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256) {
        uint256 tFee = calculateTaxFee(tAmount);
        uint256 tLiquidity = calculateLiquidityFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);
        return (tTransferAmount, tFee, tLiquidity);
    }

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns(uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns(uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;      
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
            rSupply = rSupply.sub(_rOwned[_excluded[i]]);
            tSupply = tSupply.sub(_tOwned[_excluded[i]]);
        }
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }
    
    function _takeLiquidity(uint256 tLiquidity) private {
        uint256 currentRate =  _getRate();
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);
        if(_isExcluded[address(this)])
            _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);
    }
    
    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_taxFee).div(
            10**2
        );
    }

    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_liquidityFee).div(
            10**2
        );
    }
    
    function removeAllFee() private {
        if(_taxFee == 0 && _liquidityFee == 0) return;
        
        _previousTaxFee = _taxFee;
        _previousLiquidityFee = _liquidityFee;
        
        _taxFee = 0;
        _liquidityFee = 0;
    }
    
    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _liquidityFee = _previousLiquidityFee;
    }
    
    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        if(from != owner() && to != owner())
            require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");

        // is the token balance of this contract address over the min number of
        // tokens that we need to initiate a swap + liquidity lock?
        // also, don't get caught in a circular liquidity event.
        // also, don't swap & liquify if sender is uniswap pair.
        uint256 contractTokenBalance = balanceOf(address(this));
        
        if(contractTokenBalance >= _maxTxAmount)
        {
            contractTokenBalance = _maxTxAmount;
        }
        
        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
        if (
            overMinTokenBalance &&
            !inSwapAndLiquify &&
            from != uniswapV2Pair &&
            swapAndLiquifyEnabled
        ) {
            contractTokenBalance = numTokensSellToAddToLiquidity;
            //add liquidity
            swapAndLiquify(contractTokenBalance);
        }
        
        //indicates if fee should be deducted from transfer
        bool takeFee = true;
        
        //if any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }
        
        //transfer amount, it will take tax, burn, liquidity fee
        _tokenTransfer(from,to,amount,takeFee);
    }

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        // split the contract balance into halves
        // add the marketing wallet
        uint256 half = contractTokenBalance.div(2);
        uint256 otherHalf = contractTokenBalance.sub(half);

        // capture the contract's current ETH balance.
        // this is so that we can capture exactly the amount of ETH that the
        // swap creates, and not make the liquidity event include any ETH that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for ETH
        swapTokensForEth(half); // <- this breaks the ETH -> HATE swap when swap+liquify is triggered

        // how much ETH did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);
        uint256 marketingshare = newBalance.mul(marketingFeePercent).div(100);
        payable(marketingWallet).transfer(marketingshare);
        newBalance -= marketingshare;
        // add liquidity to uniswap
        addLiquidity(otherHalf, newBalance);
        
        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            owner(),
            block.timestamp
        );
    }

    //this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private {
        if(!canTrade){
            require(sender == owner()); // only owner allowed to trade or add liquidity
        }
        
        if(botWallets[sender] || botWallets[recipient]){
            require(botscantrade, "bots arent allowed to trade");
        }
        
        if(!takeFee)
            removeAllFee();
        
        if (_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferFromExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && _isExcluded[recipient]) {
            _transferToExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferStandard(sender, recipient, amount);
        } else if (_isExcluded[sender] && _isExcluded[recipient]) {
            _transferBothExcluded(sender, recipient, amount);
        } else {
            _transferStandard(sender, recipient, amount);
        }
        
        if(!takeFee)
            restoreAllFee();
    }

    function _transferStandard(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);           
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);   
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
pragma solidity =0.6.6;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./libraries/TransferHelper.sol";
import "./interfaces/IWETH.sol";
contract FeeReceiverMultichain is Ownable {
    address public WETH;
    constructor(address _WETH) public {
        WETH = _WETH;
    }
    /// @dev converts WETH to ETH
    function unwrapWETH() public {
        uint256 balance = IWETH(WETH).balanceOf(address(this));
        require(balance > 0, "FeeReceiver: Nothing to unwrap");
        IWETH(WETH).withdraw(balance);
    }
    /// @dev lets the owner withdraw ETH from the contract
    function withdrawETH(address payable to, uint256 amount) external onlyOwner {
        to.transfer(amount);
    }
    /// @dev lets the owner withdraw any ERC20 Token from the contract
    function withdrawERC20Token(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        IERC20(token).transfer(to, amount);
    }
    /// @dev allows to receive ETH on this contract
    receive() external payable {}
}
pragma solidity >=0.5.0;
interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint256 value) external returns (bool);
    function withdraw(uint256) external;
    function approve(address _spender, uint256 _amount) external returns (bool);
    function balanceOf(address _account) external view returns (uint256);
}
pragma solidity =0.6.6;
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: APPROVE_FAILED");
    }
    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FAILED");
    }
    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FROM_FAILED");
    }
    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, "TransferHelper: ETH_TRANSFER_FAILED");
    }
}