Contract 0x45ada0c978d2dff136e56958d31489ede4af137a 10

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


import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import './interfaces/IPair.sol';
import './interfaces/IBribe.sol';
import './interfaces/IMaLPNFT.sol';
import "./libraries/Math.sol";

interface IRewarder {
    function onReward(
        uint256 pid,
        address user,
        address recipient,
        uint256 amount,
        uint256 newLpAmount
    ) external;
}


contract MaGauge is ReentrancyGuard, Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    struct PositionInfo {
        uint amount;
        uint rewardDebt;
        uint rewardCredit;
        uint entry; // position owner's relative entry into the pool.
        uint poolId; // ensures that a single Relic is only used for one pool.
        uint level;
    }  

    bool public isForPair;


    IERC20 public rewardToken;
    IERC20 public _VE;
    IERC20 public TOKEN;

    address public DISTRIBUTION;
    address public internal_bribe;
    address public external_bribe;
    address public maNFTs;

    uint256 public DURATION;
    uint256 public periodFinish;
    uint256 public rewardRate;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;
    uint public maGaugeId;

    uint public fees0;
    uint public fees1;

    mapping(uint => uint256) public userRewardPerTokenPaid;
    mapping(uint => uint256) public rewards;

    uint256 public _totalSupply;
    mapping(uint => uint256) public _balances;
    mapping(uint => uint256) public _depositEpoch;
    mapping(uint => uint256) public _start;
    uint nextEpoch;

    event RewardAdded(uint256 reward);
    event Deposit(address indexed user, uint tokenId, uint256 amount);
    event Withdraw(address indexed user, uint tokenId, uint256 amount);
    event Harvest(address indexed user, uint tokenId, uint256 reward);
    event ClaimFees(address indexed from, uint claimed0, uint claimed1);
    event Merged(uint from, uint to);
    event Splited(uint from,address _to,  uint[] amounts);


    uint WEEK;
    uint[16] balancesByEpoch;
    uint PRECISION = 1000;


    function updateReward(uint _tokenId) public {
        adjustWeights();
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (_tokenId != 0) {
            rewards[_tokenId] = earned(_tokenId);
            userRewardPerTokenPaid[_tokenId] = rewardPerTokenStored;
        }
    }


    function adjustWeights() public {

        if( block.timestamp >= nextEpoch) {
            
            uint nextValue;
            uint _nextValue;
            for(uint i = 0; i < balancesByEpoch.length-1; i++) {
                _nextValue = balancesByEpoch[i];
                balancesByEpoch[i] = nextValue;
                nextValue = _nextValue;
            }
            balancesByEpoch[balancesByEpoch.length-1] = balancesByEpoch[balancesByEpoch.length-1] + nextValue;

            nextEpoch = nextEpoch + WEEK;
        }
    }

    modifier onlyDistribution() {
        require(msg.sender == DISTRIBUTION, "Caller is not RewardsDistribution contract");
        _;
    }



    constructor(address _rewardToken,address _ve,address _token,address _distribution, address _internal_bribe, address _external_bribe, bool _isForPair, address _maNFTs, uint _maGaugeId) {
        rewardToken = IERC20(_rewardToken);     // main reward
        _VE = IERC20(_ve);                      // vested
        TOKEN = IERC20(_token);                 // underlying (LP)
        DISTRIBUTION = _distribution;           // distro address (voter)
        DURATION = 7 * 86400;  
        WEEK = 7 * 86400;                   // week
        
        nextEpoch = ((block.timestamp/WEEK)+1) * WEEK;
        maGaugeId = _maGaugeId;
        maNFTs = _maNFTs;

        internal_bribe = _internal_bribe;       // lp fees goes here
        external_bribe = _external_bribe;       // bribe fees goes here

        isForPair = _isForPair;                       // pair boolean, if false no claim_fees

    }

    ///@notice set distribution address (should be GaugeProxyL2)
    function setDistribution(address _distribution) external onlyOwner {
        require(_distribution != address(0), "zero addr");
        require(_distribution != DISTRIBUTION, "same addr");
        DISTRIBUTION = _distribution;
    }


    ///@notice total supply held
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    ///@notice total weight of matured liquidity provided
    function totalWeight() public view returns (uint256 _totalWeight) {
        uint[] memory weightsAmount = IMaLPNFT(maNFTs).getWeightByEpoch();
        uint _weightAmount;

        for(uint i = 0; i < balancesByEpoch.length; i++) {
            if (i < weightsAmount.length) {
                _weightAmount = weightsAmount[i];
            }
            _totalWeight = _totalWeight + (balancesByEpoch[i]*_weightAmount/PRECISION);
        }
    }

    ///@notice balance of a position
    function balanceOfToken(uint tokenId) public view returns (uint256) {
        return _balances[tokenId];
    }

        ///@notice balance of a position
    function balanceOf(address _user) external view returns (uint256) {
        uint _totalBalance;
        uint[] memory _tokenIds = IMaLPNFT(maNFTs).maGaugeTokensOfOwner(_user, address(this));
        for (uint i; i < _tokenIds.length; i++){
            _totalBalance += balanceOfToken(_tokenIds[i]);
        }
        return _totalBalance;
    }

    ///@notice weight of a position
    function weightOfToken(uint _tokenId) public view returns (uint256) {
        uint _balance = _balances[_tokenId];
        uint _matLevel = maturityLevelOfTokenMaxBoost( _tokenId );
        uint[] memory weightsAmount = IMaLPNFT(maNFTs).getWeightByEpoch();
        uint _weight = _balance*weightsAmount[_matLevel]/PRECISION;
        return _weight;
    }

    
    ///@notice total weight of a user
    function weightOfUser(address _user ) public view returns (uint256) {
        uint _totalWeight;
        uint[] memory _tokenIds = IMaLPNFT(maNFTs).maGaugeTokensOfOwner(_user, address(this));
        for (uint i; i < _tokenIds.length; i++){
            _totalWeight += weightOfToken(_tokenIds[i]);
        }
        return _totalWeight;
    }

    function maturityLevelOfTokenMaxBoost(uint _tokenId) public view returns (uint _matLevel) {
        _matLevel = (block.timestamp/WEEK) - _depositEpoch[_tokenId];
        uint _maxLevel = IMaLPNFT(maNFTs).totalMaLevels()-1;
        if (_maxLevel < _matLevel) {
            return _maxLevel;
        }
    }

    function maturityLevelOfTokenMaxArray(uint _tokenId) public view returns (uint _matLevel) {
        _matLevel = (block.timestamp/WEEK) - _depositEpoch[_tokenId];
        uint _maxMat = balancesByEpoch.length-1;
        if (_maxMat < _matLevel) {
            return _maxMat;
        }
    }

    ///@notice last time reward
    function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    ///@notice  reward for a single token
    function rewardPerToken() public view returns (uint256) {
        if (totalWeight() == 0) {
            return rewardPerTokenStored;
        } else {
            return rewardPerTokenStored.add(lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(totalWeight()));
        }
    }

    ///@notice see earned rewards for a _tokenId
    function earned(uint _tokenId) public view returns (uint256) {
        return weightOfToken(_tokenId).mul(rewardPerToken().sub(userRewardPerTokenPaid[_tokenId])).div(1e18).add(rewards[_tokenId]);
    }

    ///@notice see earned rewards for user
    function earned(address _user) public view returns (uint256) {
        uint _totalEarned;
        uint[] memory _tokenIds = IMaLPNFT(maNFTs).maGaugeTokensOfOwner(_user, address(this));
        for (uint i; i < _tokenIds.length; i++){
            _totalEarned += weightOfToken(_tokenIds[i]).mul(rewardPerToken().sub(userRewardPerTokenPaid[_tokenIds[i]])).div(1e18).add(rewards[_tokenIds[i]]);
        }
        return _totalEarned;
    }


    ///@notice get total reward for the duration
    function rewardForDuration() external view returns (uint256) {
        return rewardRate * DURATION;
    }


    ///@notice deposit all TOKEN of msg.sender
    function depositAll() external returns(uint _tokenId) {
        _tokenId = _deposit(TOKEN.balanceOf(msg.sender), msg.sender);
    }

    ///@notice deposit amount TOKEN
    function deposit(uint256 amount) external returns(uint _tokenId) {
        _tokenId = _deposit(amount, msg.sender);
    }
        ///@notice deposit amount TOKEN to address _to
    function depositTo(uint256 amount, address _to) external returns(uint _tokenId) {
        require(_to != address(0),"invalid address");
        _tokenId = _deposit(amount, _to);
    }

    ///@notice deposit internal
    function _deposit(uint256 amount, address account) internal nonReentrant returns(uint _tokenId) {
        require(amount > 0, "deposit(Gauge): cannot stake 0");

        _tokenId = IMaLPNFT(maNFTs).mint(account);
        updateReward(_tokenId);

        _balances[_tokenId] = _balances[_tokenId].add(amount);
        _depositEpoch[_tokenId] = (block.timestamp/WEEK);

        balancesByEpoch[0] = balancesByEpoch[0] + amount;
        
        _totalSupply = _totalSupply + amount;

        TOKEN.safeTransferFrom(msg.sender, address(this), amount);

        emit Deposit(account, _tokenId, amount);
    }


    ///@notice withdraw internal
    function _withdraw(uint256 _tokenId) internal nonReentrant {
        require(IMaLPNFT(maNFTs).isApprovedOrOwner(msg.sender,_tokenId));
        require(IMaLPNFT(maNFTs).fromThisGauge(_tokenId));

        updateReward(_tokenId);
        uint amount = _balances[_tokenId];
        require(_tokenId > 0, "token Must Exist");
        require(amount > 0, "token Must Exist");
        require(_totalSupply.sub(amount) >= 0, "supply < 0");


        _totalSupply = _totalSupply.sub(amount);
        uint level = maturityLevelOfTokenMaxArray(_tokenId);
        balancesByEpoch[level] = balancesByEpoch[level] - amount;
        
        _balances[_tokenId] = _balances[_tokenId].sub(amount);
        _depositEpoch[_tokenId] = 0;

        IMaLPNFT(maNFTs).burn(_tokenId);

        TOKEN.safeTransfer(msg.sender, amount);

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


    ///@notice withdraw TOKEN and harvest rewardToken
    function withdrawAndHarvest(uint _tokenId) external {
        getReward(_tokenId);
        _withdraw(_tokenId);
    }

    function withdrawAndHarvestAll() external {
        uint256[] memory _tokenIds = IMaLPNFT(maNFTs).maGaugeTokensOfOwner(msg.sender,address(this));

        for (uint256 i; i < _tokenIds.length; i++) {
            getReward(_tokenIds[i]);
            _withdraw(_tokenIds[i]);
        }
    }
    

    function getAllReward() external {
        uint256[] memory _tokenIds = IMaLPNFT(maNFTs).maGaugeTokensOfOwner(msg.sender,address(this));

        for (uint256 i; i < _tokenIds.length; i++) {
            getReward(_tokenIds[i]);
        }
    }


    function harvestAndMerge(uint _from, uint _to) external  {
        require(_from != _to);
        require ( _depositEpoch[_from] == _depositEpoch[_to], "Maturity level should be the same in both maNFTs");
        
        getReward(_from);  //those functions ensure its from msg.sender and they are from this gauge
        getReward(_to);

        _balances[_to] += _balances[_from];
        _balances[_from] = 0;

        _depositEpoch[_from] = 0;

        IMaLPNFT(maNFTs).burn(_from);

        emit Merged( _from, _to);
    }
    
    
    function harvestAndSplit(uint[] memory amounts, uint _tokenId) external  {
        
        getReward(_tokenId);  //those functions ensure its from msg.sender and they are from this gauge


        uint value = _balances[_tokenId];
        uint __depositEpoch = _depositEpoch[_tokenId];

        address _to = IMaLPNFT(maNFTs).ownerOf(_tokenId);

        uint i;
        uint _totalWeight = 0;
        for(i = 0; i < amounts.length; i++){
            _totalWeight += amounts[i];
        }

        uint _value = 0;
        for(i = 0; i < amounts.length; i++){   

            uint __tokenId = IMaLPNFT(maNFTs).mint(_to);
            updateReward(__tokenId);
            _value = value * amounts[i] / _totalWeight;
            _depositEpoch[__tokenId] = __depositEpoch;
            _balances[__tokenId] = _value;
        }

        _balances[_tokenId] = 0;
        _depositEpoch[_tokenId] = 0;
        IMaLPNFT(maNFTs).burn(_tokenId);

        emit Splited( _tokenId, _to, amounts);
    }

    
    ///@notice User harvest function
    function getReward(uint _tokenId) public nonReentrant {
        require(IMaLPNFT(maNFTs).isApprovedOrOwner(msg.sender,_tokenId));
        require(IMaLPNFT(maNFTs).fromThisGauge(_tokenId));
        updateReward(_tokenId);
        uint256 reward = rewards[_tokenId];
        if (reward > 0) {
            rewards[_tokenId] = 0;
            rewardToken.safeTransfer(msg.sender, reward);
            emit Harvest(msg.sender, _tokenId, reward);
        }


    }

    function _periodFinish() external view returns (uint256) {
        return periodFinish;
    }

    /// @dev Receive rewards from distribution
    function notifyRewardAmount(address token, uint reward) external nonReentrant onlyDistribution {
        updateReward(0);
        require(token == address(rewardToken));
        rewardToken.safeTransferFrom(DISTRIBUTION, address(this), reward);

        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(DURATION);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(DURATION);
        }

        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint256 balance = rewardToken.balanceOf(address(this));
        require(rewardRate <= balance.div(DURATION), "Provided reward too high");

        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(DURATION);
        emit RewardAdded(reward);
    }

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

    function _claimFees() internal returns (uint claimed0, uint claimed1) {
        if (!isForPair) {
            return (0, 0);
        }
        address _token = address(TOKEN);

        (claimed0, claimed1) = IPair(_token).claimFees();

        if (claimed0 > 0 || claimed1 > 0) {
            uint _fees0 = fees0 + claimed0;
            uint _fees1 = fees1 + claimed1;
            (address _token0, address _token1) = IPair(_token).tokens();

            if (_fees0  > 0) {
                fees0 = 0;
                IERC20(_token0).approve(internal_bribe, _fees0);
                IBribe(internal_bribe).notifyRewardAmount(_token0, _fees0);
            } else {
                fees0 = _fees0;
            }


            if (_fees1  > 0) {
                fees1 = 0;
                IERC20(_token1).approve(internal_bribe, _fees1);
                IBribe(internal_bribe).notifyRewardAmount(_token1, _fees1);
            } else {
                fees1 = _fees1;
            }


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



}

// SPDX-License-Identifier: MIT
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 view 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);

    function name() external view returns(string memory);
    function symbol() external view returns(string memory);
    function totalSupply() external view returns (uint);
    function decimals() external view returns (uint8);

    function claimable0(address _user) external view returns (uint);
    function claimable1(address _user) external view returns (uint);

    function isStable() external view returns(bool);
    function sync() external;


    /*function token0() external view returns(address);
    function reserve0() external view returns(address);
    function decimals0() external view returns(address);
    function token1() external view returns(address);
    function reserve1() external view returns(address);
    function decimals1() external view returns(address);*/


}

// SPDX-License-Identifier: MIT
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);
}

// SPDX-License-Identifier: MIT
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;
    }}
}

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

interface IMaLPNFT {
  

  function addGauge ( address _maGaugeAddress, address _pool, address _token0, address _token1, uint _maGaugeId ) external;
  function approve ( address _approved, uint256 _tokenId ) external;
  function artProxy (  ) external view returns ( address );
  function balanceOf ( address _owner ) external view returns ( uint256 );
  function burn ( uint256 _tokenId ) external;
  function getApproved ( uint256 _tokenId ) external view returns ( address );
  function initialize ( address art_proxy ) external;
  function isApprovedForAll ( address _owner, address _operator ) external view returns ( bool );
  function isApprovedOrOwner ( address _spender, uint256 _tokenId ) external view returns ( bool );
  function killGauge ( address _gauge ) external;
  function maGauges ( address ) external view returns (
    bool active,
    bool stablePair,
    address pair,
    address token0,
    address token1,
    address maGaugeAddress,
    string memory name,
    string memory symbol,
    uint maGaugeId
  );
  function mint ( address _to ) external returns ( uint256 _tokenId );
  function ms (  ) external view returns ( address );
  function name (  ) external view returns ( string memory );
  function ownerOf ( uint256 _tokenId ) external view returns ( address );
  function ownership_change ( uint256 ) external view returns ( uint256 );
  function reset (  ) external;
  function reviveGauge ( address _gauge ) external;
  function maGaugeTokensOfOwner(address _owner, address _gauge) external view returns (uint256[] memory);
  function fromThisGauge(uint _tokenId) external view returns(bool);
  function safeTransferFrom ( address _from, address _to, uint256 _tokenId ) external;
  function safeTransferFrom ( address _from, address _to, uint256 _tokenId, bytes memory _data  ) external;
  function setApprovalForAll ( address _operator, bool _approved ) external;
  function setArtProxy ( address _proxy ) external;
  function setBoostParams ( uint256 _maxBonusEpoch, uint256 _maxBonusPercent ) external;
  function setTeam ( address _team ) external;
  function supportsInterface ( bytes4 _interfaceID ) external view returns ( bool );
  function symbol (  ) external view returns ( string memory );
  function team (  ) external view returns ( address );
  function getWeightByEpoch() external view returns (uint[] memory weightsByEpochs);
  function totalMaLevels() external view returns (uint _totalMaLevels);
  function tokenOfOwnerByIndex ( address _owner, uint256 _tokenIndex ) external view returns ( uint256 );
  function tokenToGauge ( uint256 ) external view returns ( address );
  function tokenURI ( uint256 _tokenId ) external view returns ( string memory );
  function transferFrom ( address _from, address _to, uint256 _tokenId ) external;
  function version (  ) external view returns ( string memory );
  function voter (  ) external view returns ( address );
}

// 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 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// 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 (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

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

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

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

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// 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: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [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://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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