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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

import "./interfaces/IFeeDistributor.sol";
import "./interfaces/IERC20.sol";
import "./interfaces/IVoter.sol";
import "./interfaces/IVotingEscrow.sol";

contract FeeDistributor is IFeeDistributor, Initializable {
    address public voter; // only voter can modify balances (since it only happens on vote())
    address public _ve;
    address public pairFees;

    uint256 internal _unlocked;
    uint256 public constant WEEK = 1 weeks;
    uint256 public firstPeriod;

    /// @notice token id => amount
    mapping(uint256 => uint256) public balanceOf;

    /// @notice total amount of votes per epoch
    mapping(uint256 => uint256) public votes; // epoch => amount

    /// @notice period => token id => amount
    mapping(uint256 => mapping(uint256 => uint256)) public userVotes;

    /// @notice period => token => total supply
    mapping(uint256 => mapping(address => uint256)) public rewardSupply;

    /// @notice period => token id => token => amount
    mapping(uint256 => mapping(uint256 => mapping(address => uint256)))
        public userClaimed;

    /// @notice token => token id => period
    mapping(address => mapping(uint256 => uint256)) public lastClaimByToken;

    address[] public rewards;
    mapping(address => bool) public isReward;

    event Deposit(address indexed from, uint256 tokenId, uint256 amount);
    event Withdraw(address indexed from, uint256 tokenId, uint256 amount);
    event NotifyReward(
        address indexed from,
        address indexed reward,
        uint256 amount,
        uint256 period
    );
    event VotesIncentivized(
        address indexed from,
        address indexed reward,
        uint256 amount,
        uint256 period
    );
    event ClaimRewards(
        uint256 period,
        uint256 tokenId,
        address receiver,
        address reward,
        uint256 amount
    );

    constructor() {
        _disableInitializers();
    }

    function initialize(
        address _voter,
        address _pairFees
    ) external initializer {
        _unlocked = 1;

        voter = _voter;
        _ve = IVoter(_voter)._ve();

        firstPeriod = getPeriod();
        pairFees = _pairFees;
    }

    function setPairFees() external reinitializer(2) {
        require(
            address(this) == 0x60DD85d0795316b07af5319859F4e7A876e209Bb ||
                address(this) == 0x692716fCA7DCB50b017601eB36cF642Fc08c17d9 ||
                address(this) == 0x741627fD7B0a2Bb3D28a6761078B953bd50a4fEb ||
                address(this) == 0x5B24fdd2bfD5830C527bFFBf63B16D7ED9cD2521
        );

        pairFees = 0xAAA2A49958a443Dc9d19FdDEe873B5D1d6e84A2f;
    }

    /// @notice simple re-entrancy check
    modifier lock() {
        require(_unlocked == 1, "LOK");
        _unlocked = 2;
        _;
        _unlocked = 1;
    }

    function getRewardTokens() external view returns (address[] memory) {
        return rewards;
    }

    function _getReward(
        uint256 period,
        uint256 tokenId,
        address token,
        address receiver
    ) internal {
        require(period <= getPeriod(), "!FP");
        if (votes[period] != 0) {
            uint256 _reward = (rewardSupply[period][token] *
                userVotes[period][tokenId]) / votes[period];

            _reward -= userClaimed[period][tokenId][token];
            userClaimed[period][tokenId][token] += _reward;

            if (_reward > 0) {
                _safeTransfer(token, receiver, _reward);
                emit ClaimRewards(period, tokenId, receiver, token, _reward);
            }
        }
    }

    function _getAllRewards(
        uint256 tokenId,
        address[] memory tokens,
        address receiver
    ) internal {
        uint256 currentPeriod = getPeriod();
        uint256 lastClaim;
        for (uint256 i = 0; i < tokens.length; ++i) {
            lastClaim = MathUpgradeable.max(
                lastClaimByToken[tokens[i]][tokenId],
                firstPeriod
            );
            for (
                uint256 period = lastClaim;
                period <= currentPeriod;
                period += WEEK
            ) {
                _getReward(period, tokenId, tokens[i], receiver);
            }
            lastClaimByToken[tokens[i]][tokenId] = currentPeriod - WEEK;
        }
    }

    function getPeriodReward(
        uint256 period,
        uint256 tokenId,
        address token
    ) external lock {
        require(IVotingEscrow(_ve).isApprovedOrOwner(msg.sender, tokenId));
        _getReward(period, tokenId, token, msg.sender);
    }

    function getReward(uint256 tokenId, address[] memory tokens) external lock {
        require(IVotingEscrow(_ve).isApprovedOrOwner(msg.sender, tokenId));
        _getAllRewards(tokenId, tokens, msg.sender);
    }

    /// @dev used by Voter to allow batched reward claims
    function getRewardForOwner(
        uint256 tokenId,
        address[] memory tokens
    ) external lock {
        require(msg.sender == voter);
        address owner = IVotingEscrow(_ve).ownerOf(tokenId);
        _getAllRewards(tokenId, tokens, owner);
    }

    function earned(
        address token,
        uint256 tokenId
    ) external view returns (uint256 reward) {
        uint256 currentPeriod = getPeriod();
        uint256 lastClaim = MathUpgradeable.max(
            lastClaimByToken[token][tokenId],
            firstPeriod
        );
        for (
            uint256 period = lastClaim;
            period <= currentPeriod;
            period += WEEK
        ) {
            if (votes[period] != 0) {
                reward +=
                    (rewardSupply[period][token] * userVotes[period][tokenId]) /
                    votes[period];

                reward -= userClaimed[period][tokenId][token];
            }
        }
    }

    function getPeriod() public view returns (uint256) {
        return (block.timestamp / WEEK) * WEEK;
    }

    /// @dev This is an external function, but internal notation is used since it can only be called "internally" from Voter
    function _deposit(uint256 amount, uint256 tokenId) external {
        require(msg.sender == voter);

        uint256 period = getPeriod() + WEEK;

        balanceOf[tokenId] += amount;
        votes[period] += amount;
        userVotes[period][tokenId] += amount;

        emit Deposit(msg.sender, tokenId, amount);
    }

    function _withdraw(uint256 amount, uint256 tokenId) external {
        require(msg.sender == voter);

        uint256 period = getPeriod() + WEEK;

        balanceOf[tokenId] -= amount;
        if (userVotes[period][tokenId] > 0) {
            userVotes[period][tokenId] -= amount;
            votes[period] -= amount;
        }

        emit Withdraw(msg.sender, tokenId, amount);
    }

    function notifyRewardAmount(address token, uint256 amount) external lock {
        require(msg.sender == pairFees, "!FEES");
        uint256 period = getPeriod();

        /// @notice there are no votes for the first period; distribute first period fees as vote incentives to second period voters
        if (votes[period] == 0) {
            period += WEEK;
        }

        if (!isReward[token]) {
            isReward[token] = true;
            rewards.push(token);
        }

        uint256 balanceBefore = IERC20(token).balanceOf(address(this));
        _safeTransferFrom(token, msg.sender, address(this), amount);
        uint256 balanceAfter = IERC20(token).balanceOf(address(this));

        amount = balanceAfter - balanceBefore;
        rewardSupply[period][token] += amount;
        emit NotifyReward(msg.sender, token, amount, period);
    }

    /// @dev record incentives amount for next period
    function incentivize(address token, uint256 amount) external lock {
        uint256 period = getPeriod() + WEEK;

        if (!isReward[token]) {
            isReward[token] = true;
            rewards.push(token);
        }

        uint256 balanceBefore = IERC20(token).balanceOf(address(this));
        _safeTransferFrom(token, msg.sender, address(this), amount);
        uint256 balanceAfter = IERC20(token).balanceOf(address(this));

        amount = balanceAfter - balanceBefore;
        rewardSupply[period][token] += amount;
        emit VotesIncentivized(msg.sender, token, amount, period);
    }

    function _safeTransfer(address token, address to, uint256 value) internal {
        require(token.code.length > 0);
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20.transfer.selector, to, value)
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))));
    }

    function _safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        require(token.code.length > 0);
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(
                IERC20.transferFrom.selector,
                from,
                to,
                value
            )
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library MathUpgradeable {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);

    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function balanceOf(address) external view returns (uint256);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    function name() external view returns (string memory);

    function burn(uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IFeeDistributor {
    function initialize(address _voter, address _pairFees) external;

    function _deposit(uint256 amount, uint256 tokenId) external;

    function _withdraw(uint256 amount, uint256 tokenId) external;

    function getRewardForOwner(
        uint256 tokenId,
        address[] memory tokens
    ) external;

    function notifyRewardAmount(address token, uint256 amount) external;

    function getRewardTokens() external view returns (address[] memory);

    function earned(
        address token,
        uint256 tokenId
    ) external view returns (uint256 reward);

    function incentivize(address token, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.7.6 || ^0.8.13;
pragma abicoder v2;

interface IVoter {
    function _ve() external view returns (address);

    function governor() external view returns (address);

    function emergencyCouncil() external view returns (address);

    function attachTokenToGauge(uint256 _tokenId, address account) external;

    function detachTokenFromGauge(uint256 _tokenId, address account) external;

    function emitDeposit(
        uint256 _tokenId,
        address account,
        uint256 amount
    ) external;

    function emitWithdraw(
        uint256 _tokenId,
        address account,
        uint256 amount
    ) external;

    function isWhitelisted(address token) external view returns (bool);

    function notifyRewardAmount(uint256 amount) external;

    function distribute(address _gauge) external;

    function gauges(address pool) external view returns (address);

    function feeDistributors(address gauge) external view returns (address);

    function gaugefactory() external view returns (address);

    function feeDistributorFactory() external view returns (address);

    function minter() external view returns (address);

    function factory() external view returns (address);

    function length() external view returns (uint256);

    function pools(uint256) external view returns (address);

    function isAlive(address) external view returns (bool);

    function setXRatio(uint256 _xRatio) external;

    function setPoolXRatio(
        address[] calldata _gauges,
        uint256[] calldata _xRaRatios
    ) external;

    function resetGaugeXRatio(address[] calldata _gauges) external;

    function whitelist(address _token) external;

    function forbid(address _token, bool _status) external;

    function whitelistOperator() external view returns (address);

    function gaugeXRatio(address gauge) external view returns (uint256);

    function isGauge(address gauge) external view returns (bool);

    function killGauge(address _gauge) external;

    function reviveGauge(address _gauge) external;

    function stale(uint256 _tokenID) external view returns (bool);

    function poolForGauge(address gauge) external view returns (address pool);

    function recoverFees(
        address[] calldata fees,
        address[][] calldata tokens
    ) external;

    function designateStale(uint256 _tokenId, bool _status) external;

    function base() external view returns (address);

    function xToken() external view returns (address);

    function addClGaugeReward(address gauge, address reward) external;

    function removeClGaugeReward(address gauge, address reward) external;

    function addInitialRewardPerGauge(address _gauge, address token) external;

    function clawBackUnusedEmissions(address[] calldata _gauges) external;

    function customGaugeForPool(
        address pool
    ) external view returns (address customGauge);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.7.6 || ^0.8.13;
pragma abicoder v2;

interface IVotingEscrow {
    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint256 ts;
        uint256 blk; // block
    }

    struct LockedBalance {
        int128 amount;
        uint256 end;
    }

    function emissionsToken() external view returns (address);

    function team() external returns (address);

    function epoch() external view returns (uint256);

    function pointHistory(uint256 loc) external view returns (Point memory);

    function userPointHistory(
        uint256 tokenId,
        uint256 loc
    ) external view returns (Point memory);

    function userPointEpoch(uint256 tokenId) external view returns (uint256);

    function ownerOf(uint256) external view returns (address);

    function isApprovedOrOwner(address, uint256) external view returns (bool);

    function transferFrom(address, address, uint256) external;

    function voting(uint256 tokenId) external;

    function abstain(uint256 tokenId) external;

    function attach(uint256 tokenId) external;

    function detach(uint256 tokenId) external;

    function checkpoint() external;

    function depositFor(uint256 tokenId, uint256 value) external;

    function createLockFor(
        uint256,
        uint256,
        address
    ) external returns (uint256);

    function balanceOfNFT(uint256) external view returns (uint256);

    function balanceOfNFTAt(uint256, uint256) external view returns (uint256);

    function totalSupply() external view returns (uint256);

    function locked__end(uint256) external view returns (uint256);

    function balanceOf(address) external view returns (uint256);

    function tokenOfOwnerByIndex(
        address,
        uint256
    ) external view returns (uint256);

    function increaseUnlockTime(uint256 tokenID, uint256 duration) external;

    function locked(
        uint256 tokenID
    ) external view returns (uint256 amount, uint256 unlockTime);

    function increaseAmount(uint256 _tokenId, uint256 _value) external;

    function isDelegate(
        address _operator,
        uint256 _tokenId
    ) external view returns (bool);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "evmVersion": "paris",
  "viaIR": true,
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ype":"uint256","name":"","type":"uint256"}],"name":"lastClaimByToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"notifyRewardAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"pairFees","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"rewardSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewards","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"setPairFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"userClaimed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userVotes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"voter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"votes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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