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// SPDX-License-Identifier: MIT

pragma solidity =0.8.23;

import "@openzeppelin/contracts/access/Ownable.sol";

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address _owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

error ZeroAddress();
error ContractAddress();
error TradingAlreadyEnabled();
error NotEnoughTokens();


contract BLOX is IERC20, Ownable {
    mapping (address => uint) private _balances;
    mapping (address => mapping (address => uint)) private _allowances;
    mapping (address => bool) public allowList;

    //strings
    string private constant _name = 'BLOX';
    string private constant _symbol = 'BLOX';

    //uints
    uint private constant InitialSupply= 100_000_000 * 10**_decimals;
    uint8 private constant _decimals = 18;

    bool public tradingOpen = false;

    constructor () {
        _balances[msg.sender] = InitialSupply;
        allowList[msg.sender] = true;
    }

    /**
    * @notice Internal function to transfer tokens from one address to another.
     */
    function _transfer(
        address sender, 
        address recipient, 
        uint amount
    ) internal {
        if(sender == address(0)) revert ZeroAddress();
        if(recipient == address(0)) revert ZeroAddress();

        if(allowList[sender])
            _allowedTransfer(sender, recipient, amount);
        else {
            require(tradingOpen,"trading not yet enabled");
            _allowedTransfer(sender,recipient,amount);
        }
    }

    /**
    * @notice Transfer amount of tokens without fees.
    * @dev In feelessTransfer, there isn't limit as well.
    * @param sender The address of user to send tokens.
    * @param recipient The address of user to be recieveid tokens.
    * @param amount The token amount to transfer.
    */
    function _allowedTransfer(
        address sender, 
        address recipient, 
        uint amount
    ) internal {
        uint senderBalance = _balances[sender];
        require(senderBalance >= amount, "Transfer exceeds balance");
        _balances[sender]-=amount;
        _balances[recipient]+=amount;
        emit Transfer(sender,recipient,amount);
    }

    /**
    * @notice Get Burned tokens.
    * @dev This function is for get burned tokens.
    */
    function getBurnedTokens(
    ) public view returns(uint) {
        return _balances[address(0xdead)];
    }

    /**
    * @notice Get circulating supply.
    * @dev This function is for get circulating supply.
     */
    function getCirculatingSupply(
    ) public view returns(uint) {
        return InitialSupply-_balances[address(0xdead)];
    }


    /**
    * @notice Set to allowed trade early.
    * @dev This function is for set to allowed trade early.
    * @param account The address of user to be allowed early.
    * @param boolean The status of allowed.
    */
    function allowListChange(
        address account, 
        bool boolean
    ) external onlyOwner {
        if(account == address(0)) revert ZeroAddress();
        allowList[account]=boolean;
    }
    

    /**
    * @notice Used to start trading.
    * @dev This function is for used to start trading.
    */
    function SetupEnableTrading(
    ) external onlyOwner{
        if(tradingOpen) revert TradingAlreadyEnabled();
        tradingOpen = true;
    }

    receive() external payable {}
    function name() external pure override returns (string memory) {return _name;}
    function symbol() external pure override returns (string memory) {return _symbol;}
    function decimals() external pure override returns (uint8) {return _decimals;}
    function totalSupply() external pure override returns (uint) {return InitialSupply;}
    function balanceOf(address account) public view override returns (uint) {return _balances[account];}
    function isAllowed(address account) public view returns(bool) {return allowList[account];}
    
    function transfer(
        address recipient, 
        uint amount
    ) external override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }
    function allowance(
        address _owner, 
        address spender
    ) external view override returns (uint) {
        return _allowances[_owner][spender];
    }
    function approve(
        address spender, 
        uint amount
    ) external override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }
    function _approve(
        address _owner, 
        address spender, 
        uint amount
    ) private {
        if(_owner == address(0)) revert ZeroAddress();
        if(spender == address(0)) revert ZeroAddress();
        _allowances[_owner][spender] = amount;
        emit Approval(_owner, spender, amount);
    }
    function transferFrom(
        address sender, 
        address recipient, 
        uint amount
    ) external override returns (bool) {
        _transfer(sender, recipient, amount);
        uint currentAllowance = _allowances[sender][msg.sender];
        require(currentAllowance >= amount, "Transfer > allowance");
        _approve(sender, msg.sender, currentAllowance - amount);
        return true;
    }
    function increaseAllowance(
        address spender, 
        uint addedValue
    ) external returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender] + addedValue);
        return true;
    }
    function decreaseAllowance(
        address spender, 
        uint subtractedValue
    ) external returns (bool) {
        uint currentAllowance = _allowances[msg.sender][spender];
        require(currentAllowance >= subtractedValue, "<0 allowance");
        _approve(msg.sender, spender, currentAllowance - subtractedValue);
        return true;
    }

    /**
    * @notice Used to remove excess ETH from contract
    * @dev This function is for used to remove excess ETH from contract.
    * @param amountPercentage The amount percentage to recover.
     */
    function emergencyETHrecovery(
        uint256 amountPercentage
    ) external onlyOwner {
        uint256 amountETH = address(this).balance;
        (bool sent,)=msg.sender.call{value:amountETH * amountPercentage / 100}("");
            sent=true;
    }
    
    /**
    * @notice Used to remove excess Tokens from contract
    * @dev This function is for used to remove excess Tokens from contract.
    * @param tokenAddress The token address to recover.
    * @param amountPercentage The amount percentage to recover.
     */
    function emergencyTokenrecovery(
        address tokenAddress, 
        uint256 amountPercentage
    ) external onlyOwner {
        IERC20 token = IERC20(tokenAddress);
        uint256 tokenAmount = token.balanceOf(address(this));
        token.transfer(msg.sender, tokenAmount * amountPercentage / 100);
    }

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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e":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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