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

import 'contracts/libraries/Math.sol';
import 'contracts/interfaces/IBribe.sol';
import 'contracts/interfaces/IERC20.sol';
import 'contracts/interfaces/IGauge.sol';
import 'contracts/interfaces/IPair.sol';
import 'contracts/interfaces/IVoter.sol';
import 'contracts/interfaces/IVotingEscrow.sol';

// Gauges are used to incentivize pools, they emit reward tokens over 7 days for staked LP tokens
contract Gauge is IGauge {

    address public immutable stake; // the LP token that needs to be staked for rewards
    address public immutable _ve; // the ve token used for gauges
    address public immutable internal_bribe;
    address public immutable external_bribe;
    address public immutable voter;

    uint public derivedSupply;
    mapping(address => uint) public derivedBalances;

    bool public isForPair;

    uint internal constant DURATION = 7 days; // rewards are released over 7 days
    uint internal constant PRECISION = 10 ** 18;
    uint internal constant MAX_REWARD_TOKENS = 16;

    // default snx staking contract implementation
    mapping(address => uint) public rewardRate;
    mapping(address => uint) public periodFinish;
    mapping(address => uint) public lastUpdateTime;
    mapping(address => uint) public rewardPerTokenStored;

    mapping(address => mapping(address => uint)) public lastEarn;
    mapping(address => mapping(address => uint)) public userRewardPerTokenStored;

    mapping(address => uint) public tokenIds;

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

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

    /// @notice A checkpoint for marking balance
    struct Checkpoint {
        uint timestamp;
        uint balanceOf;
    }

    /// @notice A checkpoint for marking reward rate
    struct RewardPerTokenCheckpoint {
        uint timestamp;
        uint rewardPerToken;
    }

    /// @notice A checkpoint for marking supply
    struct SupplyCheckpoint {
        uint timestamp;
        uint supply;
    }

    /// @notice A record of balance checkpoints for each account, by index
    mapping (address => mapping (uint => Checkpoint)) public checkpoints;
    /// @notice The number of checkpoints for each account
    mapping (address => uint) public numCheckpoints;
    /// @notice A record of balance checkpoints for each token, by index
    mapping (uint => SupplyCheckpoint) public supplyCheckpoints;
    /// @notice The number of checkpoints
    uint public supplyNumCheckpoints;
    /// @notice A record of balance checkpoints for each token, by index
    mapping (address => mapping (uint => RewardPerTokenCheckpoint)) public rewardPerTokenCheckpoints;
    /// @notice The number of checkpoints for each token
    mapping (address => uint) public rewardPerTokenNumCheckpoints;

    uint public fees0;
    uint public fees1;

    event Deposit(address indexed from, uint tokenId, uint amount);
    event Withdraw(address indexed from, uint tokenId, uint amount);
    event NotifyReward(address indexed from, address indexed reward, uint amount);
    event ClaimFees(address indexed from, uint claimed0, uint claimed1);
    event ClaimRewards(address indexed from, address indexed reward, uint amount);

    constructor(address _stake, address _internal_bribe, address _external_bribe, address  __ve, address _voter, bool _forPair, address[] memory _allowedRewardTokens) {
        stake = _stake;
        internal_bribe = _internal_bribe;
        external_bribe = _external_bribe;
        _ve = __ve;
        voter = _voter;
        isForPair = _forPair;

        for (uint i; i < _allowedRewardTokens.length; i++) {
            if (_allowedRewardTokens[i] != address(0)) {
                isReward[_allowedRewardTokens[i]] = true;
                rewards.push(_allowedRewardTokens[i]);
            }
        }
    }

    // simple re-entrancy check
    uint internal _unlocked = 1;
    modifier lock() {
        require(_unlocked == 1);
        _unlocked = 2;
        _;
        _unlocked = 1;
    }

    function claimFees() external lock returns (uint claimed0, uint claimed1) {
        return _claimFees();
    }

    function _claimFees() internal returns (uint claimed0, uint claimed1) {
        if (!isForPair) {
            return (0, 0);
        }
        (claimed0, claimed1) = IPair(stake).claimFees();
        if (claimed0 > 0 || claimed1 > 0) {
            uint _fees0 = fees0 + claimed0;
            uint _fees1 = fees1 + claimed1;
            (address _token0, address _token1) = IPair(stake).tokens();
            if (_fees0 > IBribe(internal_bribe).left(_token0) && _fees0 / DURATION > 0) {
                fees0 = 0;
                _safeApprove(_token0, internal_bribe, _fees0);
                IBribe(internal_bribe).notifyRewardAmount(_token0, _fees0);
            } else {
                fees0 = _fees0;
            }
            if (_fees1 > IBribe(internal_bribe).left(_token1) && _fees1 / DURATION > 0) {
                fees1 = 0;
                _safeApprove(_token1, internal_bribe, _fees1);
                IBribe(internal_bribe).notifyRewardAmount(_token1, _fees1);
            } else {
                fees1 = _fees1;
            }

            emit ClaimFees(msg.sender, claimed0, claimed1);
        }
    }

    /**
    * @notice Determine the prior balance for an account as of a block number
    * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
    * @param account The address of the account to check
    * @param timestamp The timestamp to get the balance at
    * @return The balance the account had as of the given block
    */
    function getPriorBalanceIndex(address account, uint timestamp) public view returns (uint) {
        uint nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].timestamp <= timestamp) {
            return (nCheckpoints - 1);
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].timestamp > timestamp) {
            return 0;
        }

        uint lower = 0;
        uint upper = nCheckpoints - 1;
        while (upper > lower) {
            uint center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.timestamp == timestamp) {
                return center;
            } else if (cp.timestamp < timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    function getPriorSupplyIndex(uint timestamp) public view returns (uint) {
        uint nCheckpoints = supplyNumCheckpoints;
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (supplyCheckpoints[nCheckpoints - 1].timestamp <= timestamp) {
            return (nCheckpoints - 1);
        }

        // Next check implicit zero balance
        if (supplyCheckpoints[0].timestamp > timestamp) {
            return 0;
        }

        uint lower = 0;
        uint upper = nCheckpoints - 1;
        while (upper > lower) {
            uint center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            SupplyCheckpoint memory cp = supplyCheckpoints[center];
            if (cp.timestamp == timestamp) {
                return center;
            } else if (cp.timestamp < timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    function getPriorRewardPerToken(address token, uint timestamp) public view returns (uint, uint) {
        uint nCheckpoints = rewardPerTokenNumCheckpoints[token];
        if (nCheckpoints == 0) {
            return (0,0);
        }

        // First check most recent balance
        if (rewardPerTokenCheckpoints[token][nCheckpoints - 1].timestamp <= timestamp) {
            return (rewardPerTokenCheckpoints[token][nCheckpoints - 1].rewardPerToken, rewardPerTokenCheckpoints[token][nCheckpoints - 1].timestamp);
        }

        // Next check implicit zero balance
        if (rewardPerTokenCheckpoints[token][0].timestamp > timestamp) {
            return (0,0);
        }

        uint lower = 0;
        uint upper = nCheckpoints - 1;
        while (upper > lower) {
            uint center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            RewardPerTokenCheckpoint memory cp = rewardPerTokenCheckpoints[token][center];
            if (cp.timestamp == timestamp) {
                return (cp.rewardPerToken, cp.timestamp);
            } else if (cp.timestamp < timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return (rewardPerTokenCheckpoints[token][lower].rewardPerToken, rewardPerTokenCheckpoints[token][lower].timestamp);
    }

    function _writeCheckpoint(address account, uint balance) internal {
        uint _timestamp = block.timestamp;
        uint _nCheckPoints = numCheckpoints[account];

        if (_nCheckPoints > 0 && checkpoints[account][_nCheckPoints - 1].timestamp == _timestamp) {
            checkpoints[account][_nCheckPoints - 1].balanceOf = balance;
        } else {
            checkpoints[account][_nCheckPoints] = Checkpoint(_timestamp, balance);
            numCheckpoints[account] = _nCheckPoints + 1;
        }
    }

    function _writeRewardPerTokenCheckpoint(address token, uint reward, uint timestamp) internal {
        uint _nCheckPoints = rewardPerTokenNumCheckpoints[token];

        if (_nCheckPoints > 0 && rewardPerTokenCheckpoints[token][_nCheckPoints - 1].timestamp == timestamp) {
            rewardPerTokenCheckpoints[token][_nCheckPoints - 1].rewardPerToken = reward;
        } else {
            rewardPerTokenCheckpoints[token][_nCheckPoints] = RewardPerTokenCheckpoint(timestamp, reward);
            rewardPerTokenNumCheckpoints[token] = _nCheckPoints + 1;
        }
    }

    function _writeSupplyCheckpoint() internal {
        uint _nCheckPoints = supplyNumCheckpoints;
        uint _timestamp = block.timestamp;

        if (_nCheckPoints > 0 && supplyCheckpoints[_nCheckPoints - 1].timestamp == _timestamp) {
            supplyCheckpoints[_nCheckPoints - 1].supply = derivedSupply;
        } else {
            supplyCheckpoints[_nCheckPoints] = SupplyCheckpoint(_timestamp, derivedSupply);
            supplyNumCheckpoints = _nCheckPoints + 1;
        }
    }

    function rewardsListLength() external view returns (uint) {
        return rewards.length;
    }

    // returns the last time the reward was modified or periodFinish if the reward has ended
    function lastTimeRewardApplicable(address token) public view returns (uint) {
        return Math.min(block.timestamp, periodFinish[token]);
    }

    function getReward(address account, address[] memory tokens) external lock {
        require(msg.sender == account || msg.sender == voter);
        _unlocked = 1;
        IVoter(voter).distribute(address(this));
        _unlocked = 2;

        for (uint i = 0; i < tokens.length; i++) {
            (rewardPerTokenStored[tokens[i]], lastUpdateTime[tokens[i]]) = _updateRewardPerToken(tokens[i], type(uint).max, true);

            uint _reward = earned(tokens[i], account);
            lastEarn[tokens[i]][account] = block.timestamp;
            userRewardPerTokenStored[tokens[i]][account] = rewardPerTokenStored[tokens[i]];
            if (_reward > 0) _safeTransfer(tokens[i], account, _reward);

            emit ClaimRewards(msg.sender, tokens[i], _reward);
        }

        uint _derivedBalance = derivedBalances[account];
        derivedSupply -= _derivedBalance;
        _derivedBalance = derivedBalance(account);
        derivedBalances[account] = _derivedBalance;
        derivedSupply += _derivedBalance;

        _writeCheckpoint(account, derivedBalances[account]);
        _writeSupplyCheckpoint();
    }


    function rewardPerToken(address token) public view returns (uint) {
        if (derivedSupply == 0) {
            return rewardPerTokenStored[token];
        }
        return rewardPerTokenStored[token] + ((lastTimeRewardApplicable(token) - Math.min(lastUpdateTime[token], periodFinish[token])) * rewardRate[token] * PRECISION / derivedSupply);
    }

    function derivedBalance(address account) public view returns (uint) {
        return balanceOf[account];
    }

    function batchRewardPerToken(address token, uint maxRuns) external {
        (rewardPerTokenStored[token], lastUpdateTime[token])  = _batchRewardPerToken(token, maxRuns);
    }

    function _batchRewardPerToken(address token, uint maxRuns) internal returns (uint, uint) {
        uint _startTimestamp = lastUpdateTime[token];
        uint reward = rewardPerTokenStored[token];

        if (supplyNumCheckpoints == 0) {
            return (reward, _startTimestamp);
        }

        if (rewardRate[token] == 0) {
            return (reward, block.timestamp);
        }

        uint _startIndex = getPriorSupplyIndex(_startTimestamp);
        uint _endIndex = Math.min(supplyNumCheckpoints-1, maxRuns);

        for (uint i = _startIndex; i < _endIndex; i++) {
            SupplyCheckpoint memory sp0 = supplyCheckpoints[i];
            if (sp0.supply > 0) {
                SupplyCheckpoint memory sp1 = supplyCheckpoints[i+1];
                (uint _reward, uint _endTime) = _calcRewardPerToken(token, sp1.timestamp, sp0.timestamp, sp0.supply, _startTimestamp);
                reward += _reward;
                _writeRewardPerTokenCheckpoint(token, reward, _endTime);
                _startTimestamp = _endTime;
            }
        }

        return (reward, _startTimestamp);
    }

    function _calcRewardPerToken(address token, uint timestamp1, uint timestamp0, uint supply, uint startTimestamp) internal view returns (uint, uint) {
        uint endTime = Math.max(timestamp1, startTimestamp);
        return (((Math.min(endTime, periodFinish[token]) - Math.min(Math.max(timestamp0, startTimestamp), periodFinish[token])) * rewardRate[token] * PRECISION / supply), endTime);
    }

    /// @dev Update stored rewardPerToken values without the last one snapshot
    ///      If the contract will get "out of gas" error on users actions this will be helpful
    function batchUpdateRewardPerToken(address token, uint maxRuns) external {
      (rewardPerTokenStored[token], lastUpdateTime[token]) = _updateRewardPerToken(token, maxRuns, false);
    }

    function _updateRewardForAllTokens() internal {
      uint length = rewards.length;
      for (uint i; i < length; i++) {
        address token = rewards[i];
        (rewardPerTokenStored[token], lastUpdateTime[token]) = _updateRewardPerToken(token, type(uint).max, true);
      }
    }

    function _updateRewardPerToken(address token, uint maxRuns, bool actualLast) internal returns (uint, uint) {
        uint _startTimestamp = lastUpdateTime[token];
        uint reward = rewardPerTokenStored[token];

        if (supplyNumCheckpoints == 0) {
            return (reward, _startTimestamp);
        }

        if (rewardRate[token] == 0) {
            return (reward, block.timestamp);
        }

        uint _startIndex = getPriorSupplyIndex(_startTimestamp);
        uint _endIndex = Math.min(supplyNumCheckpoints - 1, maxRuns);

        if (_endIndex > 0) {
            for (uint i = _startIndex; i <= _endIndex - 1; i++) {
                SupplyCheckpoint memory sp0 = supplyCheckpoints[i];
                if (sp0.supply > 0) {
                    SupplyCheckpoint memory sp1 = supplyCheckpoints[i+1];
                    (uint _reward, uint _endTime) = _calcRewardPerToken(token, sp1.timestamp, sp0.timestamp, sp0.supply, _startTimestamp);
                    reward += _reward;
                    _writeRewardPerTokenCheckpoint(token, reward, _endTime);
                    _startTimestamp = _endTime;
                }
            }
        }

        // need to override the last value with actual numbers only on deposit/withdraw/claim/notify actions
        if (actualLast) {
            SupplyCheckpoint memory sp = supplyCheckpoints[_endIndex];
            if (sp.supply > 0) {
                (uint _reward,) = _calcRewardPerToken(token, lastTimeRewardApplicable(token), Math.max(sp.timestamp, _startTimestamp), sp.supply, _startTimestamp);
                reward += _reward;
                _writeRewardPerTokenCheckpoint(token, reward, block.timestamp);
                _startTimestamp = block.timestamp;
            }
        }

        return (reward, _startTimestamp);
    }

    // earned is an estimation, it won't be exact till the supply > rewardPerToken calculations have run
    function earned(address token, address account) public view returns (uint) {
        uint _startTimestamp = Math.max(lastEarn[token][account], rewardPerTokenCheckpoints[token][0].timestamp);
        if (numCheckpoints[account] == 0) {
            return 0;
        }

        uint _startIndex = getPriorBalanceIndex(account, _startTimestamp);
        uint _endIndex = numCheckpoints[account]-1;

        uint reward = 0;

        if (_endIndex > 0) {
            for (uint i = _startIndex; i <= _endIndex-1; i++) {
                Checkpoint memory cp0 = checkpoints[account][i];
                Checkpoint memory cp1 = checkpoints[account][i+1];
                (uint _rewardPerTokenStored0,) = getPriorRewardPerToken(token, cp0.timestamp);
                (uint _rewardPerTokenStored1,) = getPriorRewardPerToken(token, cp1.timestamp);
                reward += cp0.balanceOf * (_rewardPerTokenStored1 - _rewardPerTokenStored0) / PRECISION;
            }
        }

        Checkpoint memory cp = checkpoints[account][_endIndex];
        (uint _rewardPerTokenStored,) = getPriorRewardPerToken(token, cp.timestamp);
        reward += cp.balanceOf * (rewardPerToken(token) - Math.max(_rewardPerTokenStored, userRewardPerTokenStored[token][account])) / PRECISION;

        return reward;
    }

    function depositAll(uint tokenId) external {
        deposit(IERC20(stake).balanceOf(msg.sender), tokenId);
    }

    function deposit(uint amount, uint tokenId) public lock {
        require(amount > 0);
        _updateRewardForAllTokens();

        _safeTransferFrom(stake, msg.sender, address(this), amount);
        totalSupply += amount;
        balanceOf[msg.sender] += amount;

        if (tokenId > 0) {
            require(IVotingEscrow(_ve).ownerOf(tokenId) == msg.sender);
            if (tokenIds[msg.sender] == 0) {
                tokenIds[msg.sender] = tokenId;
                IVoter(voter).attachTokenToGauge(tokenId, msg.sender);
            }
            require(tokenIds[msg.sender] == tokenId);
        } else {
            tokenId = tokenIds[msg.sender];
        }

        uint _derivedBalance = derivedBalances[msg.sender];
        derivedSupply -= _derivedBalance;
        _derivedBalance = derivedBalance(msg.sender);
        derivedBalances[msg.sender] = _derivedBalance;
        derivedSupply += _derivedBalance;

        _writeCheckpoint(msg.sender, _derivedBalance);
        _writeSupplyCheckpoint();

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

    function withdrawAll() external {
        withdraw(balanceOf[msg.sender]);
    }

    function withdraw(uint amount) public {
        uint tokenId = 0;
        if (amount == balanceOf[msg.sender]) {
            tokenId = tokenIds[msg.sender];
        }
        withdrawToken(amount, tokenId);
    }

    function withdrawToken(uint amount, uint tokenId) public lock {
        _updateRewardForAllTokens();

        totalSupply -= amount;
        balanceOf[msg.sender] -= amount;
        _safeTransfer(stake, msg.sender, amount);

        if (tokenId > 0) {
            require(tokenId == tokenIds[msg.sender]);
            tokenIds[msg.sender] = 0;
            IVoter(voter).detachTokenFromGauge(tokenId, msg.sender);
        } else {
            tokenId = tokenIds[msg.sender];
        }

        uint _derivedBalance = derivedBalances[msg.sender];
        derivedSupply -= _derivedBalance;
        _derivedBalance = derivedBalance(msg.sender);
        derivedBalances[msg.sender] = _derivedBalance;
        derivedSupply += _derivedBalance;

        _writeCheckpoint(msg.sender, derivedBalances[msg.sender]);
        _writeSupplyCheckpoint();

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

    function left(address token) external view returns (uint) {
        if (block.timestamp >= periodFinish[token]) return 0;
        uint _remaining = periodFinish[token] - block.timestamp;
        return _remaining * rewardRate[token];
    }

    function notifyRewardAmount(address token, uint amount) external lock {
        require(token != stake);
        require(amount > 0);
        if (!isReward[token]) {
            require(IVoter(voter).isWhitelisted(token), "rewards tokens must be whitelisted");
            require(rewards.length < MAX_REWARD_TOKENS, "too many rewards tokens");
        }
        if (rewardRate[token] == 0) _writeRewardPerTokenCheckpoint(token, 0, block.timestamp);
        (rewardPerTokenStored[token], lastUpdateTime[token]) = _updateRewardPerToken(token, type(uint).max, true);
        _claimFees();

        if (block.timestamp >= periodFinish[token]) {
            _safeTransferFrom(token, msg.sender, address(this), amount);
            rewardRate[token] = amount / DURATION;
        } else {
            uint _remaining = periodFinish[token] - block.timestamp;
            uint _left = _remaining * rewardRate[token];
            require(amount > _left);
            _safeTransferFrom(token, msg.sender, address(this), amount);
            rewardRate[token] = (amount + _left) / DURATION;
        }
        require(rewardRate[token] > 0);
        uint balance = IERC20(token).balanceOf(address(this));
        require(rewardRate[token] <= balance / DURATION, "Provided reward too high");
        periodFinish[token] = block.timestamp + DURATION;
        if (!isReward[token]) {
            isReward[token] = true;
            rewards.push(token);
        }

        emit NotifyReward(msg.sender, token, amount);
    }

    function swapOutRewardToken(uint i, address oldToken, address newToken) external {
        require(msg.sender == IVotingEscrow(_ve).team(), 'only team');
        require(rewards[i] == oldToken);
        isReward[oldToken] = false;
        isReward[newToken] = true;
        rewards[i] = newToken;
    }

    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))));
    }

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

pragma solidity 0.8.13;

interface IBribe {
    function _deposit(uint amount, uint tokenId) external;
    function _withdraw(uint amount, uint tokenId) external;
    function getRewardForOwner(uint tokenId, address[] memory tokens) external;
    function notifyRewardAmount(address token, uint amount) external;
    function left(address token) external view returns (uint);
}

pragma solidity 0.8.13;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function transfer(address recipient, uint amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function balanceOf(address) external view returns (uint);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);

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

pragma solidity 0.8.13;

interface IGauge {
    function notifyRewardAmount(address token, uint amount) external;
    function getReward(address account, address[] memory tokens) external;
    function claimFees() external returns (uint claimed0, uint claimed1);
    function left(address token) external view returns (uint);
    function isForPair() external view returns (bool);
}

pragma solidity 0.8.13;

interface IPair {
    function metadata() external view returns (uint dec0, uint dec1, uint r0, uint r1, bool st, address t0, address t1);
    function claimFees() external returns (uint, uint);
    function tokens() external returns (address, address);
    function transferFrom(address src, address dst, uint amount) external returns (bool);
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function burn(address to) external returns (uint amount0, uint amount1);
    function mint(address to) external returns (uint liquidity);
    function getReserves() external view returns (uint _reserve0, uint _reserve1, uint _blockTimestampLast);
    function getAmountOut(uint, address) external view returns (uint);
}

pragma solidity 0.8.13;

interface IVoter {
    function _ve() external view returns (address);
    function governor() external view returns (address);
    function emergencyCouncil() external view returns (address);
    function attachTokenToGauge(uint _tokenId, address account) external;
    function detachTokenFromGauge(uint _tokenId, address account) external;
    function emitDeposit(uint _tokenId, address account, uint amount) external;
    function emitWithdraw(uint _tokenId, address account, uint amount) external;
    function isWhitelisted(address token) external view returns (bool);
    function notifyRewardAmount(uint amount) external;
    function distribute(address _gauge) external;
}

pragma solidity 0.8.13;

interface IVotingEscrow {

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

    function token() external view returns (address);
    function team() external returns (address);
    function epoch() external view returns (uint);
    function point_history(uint loc) external view returns (Point memory);
    function user_point_history(uint tokenId, uint loc) external view returns (Point memory);
    function user_point_epoch(uint tokenId) external view returns (uint);

    function ownerOf(uint) external view returns (address);
    function isApprovedOrOwner(address, uint) external view returns (bool);
    function transferFrom(address, address, uint) external;

    function voting(uint tokenId) external;
    function abstain(uint tokenId) external;
    function attach(uint tokenId) external;
    function detach(uint tokenId) external;

    function checkpoint() external;
    function deposit_for(uint tokenId, uint value) external;
    function create_lock_for(uint, uint, address) external returns (uint);

    function balanceOfNFT(uint) external view returns (uint);
    function totalSupply() external view returns (uint);
}

pragma solidity 0.8.13;

library Math {
    function max(uint a, uint b) internal pure returns (uint) {
        return a >= b ? a : b;
    }
    function min(uint a, uint b) internal pure returns (uint) {
        return a < b ? a : b;
    }
    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;
        }
    }
    function cbrt(uint256 n) internal pure returns (uint256) { unchecked {
        uint256 x = 0;
        for (uint256 y = 1 << 255; y > 0; y >>= 3) {
            x <<= 1;
            uint256 z = 3 * x * (x + 1) + 1;
            if (n / y >= z) {
                n -= y * z;
                x += 1;
            }
        }
        return x;
    }}
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_stake","type":"address"},{"internalType":"address","name":"_internal_bribe","type":"address"},{"internalType":"address","name":"_external_bribe","type":"address"},{"internalType":"address","name":"__ve","type":"address"},{"internalType":"address","name":"_voter","type":"address"},{"internalType":"bool","name":"_forPair","type":"bool"},{"internalType":"address[]","name":"_allowedRewardTokens","type":"address[]"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"claimed0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"claimed1","type":"uint256"}],"name":"ClaimFees","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"reward","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ClaimRewards","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"reward","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"NotifyReward","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"_ve","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"maxRuns","type":"uint256"}],"name":"batchRewardPerToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"maxRuns","type":"uint256"}],"name":"batchUpdateRewardPerToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"checkpoints","outputs":[{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"uint256","name":"balanceOf","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimFees","outputs":[{"internalType":"uint256","name":"claimed0","type":"uint256"},{"internalType":"uint256","name":"claimed1","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"depositAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"derivedBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"derivedBalances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"derivedSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"account","type":"address"}],"name":"earned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"external_bribe","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fees0","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fees1","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"getPriorBalanceIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"getPriorRewardPerToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"getPriorSupplyIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"address[]","name":"tokens","type":"address[]"}],"name":"getReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"internal_bribe","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isForPair","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isReward","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"lastEarn","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"lastTimeRewardApplicable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastUpdateTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"left","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":[{"internalType":"address","name":"","type":"address"}],"name":"numCheckpoints","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"periodFinish","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"rewardPerToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardPerTokenCheckpoints","outputs":[{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"uint256","name":"rewardPerToken","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewardPerTokenNumCheckpoints","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewardPerTokenStored","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewardRate","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":"rewardsListLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stake","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"supplyCheckpoints","outputs":[{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"uint256","name":"supply","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"supplyNumCheckpoints","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"address","name":"oldToken","type":"address"},{"internalType":"address","name":"newToken","type":"address"}],"name":"swapOutRewardToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenIds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userRewardPerTokenStored","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":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"withdrawToken","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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