// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.19;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "./interface/IsHATE.sol";
import "./interface/IDistributor.sol";

contract HATEStaking is Ownable{
    /* ========== EVENTS ========== */

    event DistributorSet(address distributor);

    /* ========== DATA STRUCTURES ========== */

    struct Epoch {
        uint256 length; // in seconds
        uint256 number; // since inception
        uint256 end; // timestamp
        uint256 distribute; // amount
    }

    struct Claim {
        uint256 deposit; // if forfeiting
        uint256 gons; // staked balance
        uint256 expiry; // end of warmup period
        bool lock; // prevents malicious delays for claim
    }

    /* ========== STATE VARIABLES ========== */

    IERC20 public immutable HATE;
    IsHATE public immutable sHATE;

    Epoch public epoch;

    IDistributor public distributor;

    /* ========== CONSTRUCTOR ========== */

    constructor(address _HATE, address _sHATE, uint256 _epochLength) {
        require(_HATE != address(0), "Zero address: HATE");
        HATE = IERC20(_HATE);
        require(_sHATE != address(0), "Zero address: sHATE");
        sHATE = IsHATE(_sHATE);

        epoch = Epoch({length: _epochLength, number: 0, end: block.timestamp + _epochLength, distribute: 0});
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    /**
     * @notice stake HATE
     * @param _to address
     * @param _amount uint
     */
    function stake(address _to, uint256 _amount) external {
        HATE.transferFrom(msg.sender, address(this), _amount);
        rebase();
        sHATE.transfer(_to, _amount);
    }

    /**
     * @notice redeem sHATE for HATEs
     * @param _to address
     * @param _amount uint
     */
    function unstake(address _to, uint256 _amount, bool _rebase) external {
        if (_rebase) rebase();
        sHATE.transferFrom(msg.sender, address(this), _amount);
        require(_amount <= HATE.balanceOf(address(this)), "Insufficient HATE balance in contract");
        HATE.transfer(_to, _amount);
    }

    /**
     * @notice trigger rebase if epoch over
     */
    function rebase() public {
        if (epoch.end <= block.timestamp) {
            sHATE.rebase(epoch.distribute, epoch.number);

            epoch.end = epoch.end + epoch.length;
            epoch.number++;

            if (address(distributor) != address(0)) {
                distributor.distribute();
            }

            uint256 balance = HATE.balanceOf(address(this));
            uint256 staked = sHATE.circulatingSupply();

            if (balance <= staked) {
                epoch.distribute = 0;
            } else {
                epoch.distribute = balance - staked;
            }
        }
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    /**
     * @notice send staker their amount as sHATE
     * @param _to address
     * @param _amount uint
     */
    function _send(address _to, uint256 _amount) internal returns (uint256) {
        sHATE.transfer(_to, _amount); // send as sHATE (equal unit as HATE)
        return _amount;
    }

    /* ========== VIEW FUNCTIONS ========== */

    /**
     * @notice returns the sHATE index, which tracks rebase growth
     * @return uint
     */
    function index() public view returns (uint256) {
        return sHATE.index();
    }

    /**
     * @notice seconds until the next epoch begins
     */
    function secondsToNextEpoch() external view returns (uint256) {
        return epoch.end - block.timestamp;
    }

    /* ========== MANAGERIAL FUNCTIONS ========== */

    /**
     * @notice sets the contract address for LP staking
     * @param _distributor address
     */
    function setDistributor(address _distributor) external onlyOwner {
        distributor = IDistributor(_distributor);
        emit DistributorSet(_distributor);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 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 {
        _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 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// 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;
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.19;

interface IDistributor {
    function distribute() external;

    function nextRewardAt(uint256 _rate) external view returns (uint256);

    function nextRewardFor(address _recipient) external view returns (uint256);

    function addRecipient(address _recipient, uint256 _rewardRate) external;

    function removeRecipient(uint256 _index) external;

    function setAdjustment(
        uint256 _index,
        bool _add,
        uint256 _rate,
        uint256 _target
    ) external;
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IsHATE is IERC20 {
    function rebase(uint256 amount_, uint epoch_) external returns (uint256);

    function circulatingSupply() external view returns (uint256);

    function gonsForBalance(uint amount) external view returns (uint);

    function balanceForGons(uint gons) external view returns (uint);

    function index() external view returns (uint);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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