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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import { Initializable } from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { Address } from "@openzeppelin/contracts/utils/Address.sol";
import { ReentrancyGuardUpgradeable } from "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";

import "../PenpieOFT.sol";
import "../rewards/BaseRewardPoolV2.sol";
import "../interfaces/IBaseRewardPool.sol";
import "../interfaces/IARBRewarder.sol";
import "../interfaces/IVLPenpieBaseRewarder.sol";
import "../interfaces/IVLPenpie.sol";
import "../libraries/ERC20FactoryLib.sol";
import "../interfaces/IMintableERC20.sol";

/// @title A contract for managing all reward pools
/// @author Magpie Team
/// @notice Mater penpie emit `PNP` reward token based on Time. For a pool,

contract MasterPenpie is
    Initializable,
    OwnableUpgradeable,
    ReentrancyGuardUpgradeable,
    PausableUpgradeable
{
    using SafeERC20 for IERC20;

    /* ============ Structs ============ */

    // Info of each user.
    struct UserInfo {
        uint256 amount; // How many staking tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        uint256 available; // in case of locking
        uint256 unClaimedPenpie;
        //
        // We do some fancy math here. Basically, any point in time, the amount of Penpies
        // entitled to a user but is pending to be distributed is:
        //
        // pending reward = (user.amount * pool.accPenpiePerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws staking tokens to a pool. Here's what happens:
        //   1. The pool's `accPenpiePerShare` (and `lastRewardTimestamp`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        address stakingToken; // Address of staking token contract to be staked.
        address receiptToken; // Address of receipt token contract represent a staking position
        uint256 allocPoint; // How many allocation points assigned to this pool. Penpies to distribute per second.
        uint256 lastRewardTimestamp; // Last timestamp that Penpies distribution occurs.
        uint256 accPenpiePerShare; // Accumulated Penpies per share, times 1e12. See below.
        uint256 totalStaked;
        address rewarder;
        bool isActive; // if the pool is active
    }

    /* ============ State Variables ============ */

    // The Penpie TOKEN!
    IERC20 public penpieOFT;
    IVLPenpie public vlPenpie;

    // penpie tokens created per second.
    uint256 public penpiePerSec;

    // Registered staking tokens
    address[] public registeredToken;
    // Info of each pool.
    mapping(address => PoolInfo) public tokenToPoolInfo;
    // mapping of staking -> receipt Token
    mapping(address => address) public receiptToStakeToken;
    // Info of each user that stakes staking tokens [_staking][_account]
    mapping(address => mapping(address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint;
    // The timestamp when Penpie mining starts.
    uint256 public startTimestamp;

    mapping(address => bool) public PoolManagers;
    mapping(address => bool) public AllocationManagers;

     /* ==== variable added for mPendleSV contract === */
    address public mPendleSV;
    address public compounder;

    /* variable added for 1st upgrade */
    address public ARBRewarder;

    /* ============ Events ============ */

    event Add(
        uint256 _allocPoint,
        address indexed _stakingToken,
        address indexed _receiptToken,
        IBaseRewardPool indexed _rewarder
    );
    event Set(
        address indexed _stakingToken,
        uint256 _allocPoint,
        IBaseRewardPool indexed _rewarder
    );
    event Deposit(
        address indexed _user,
        address indexed _stakingToken,
        address indexed _receiptToken,
        uint256 _amount
    );
    event Withdraw(
        address indexed _user,
        address indexed _stakingToken,
        address indexed _receiptToken,
        uint256 _amount
    );
    event UpdatePool(
        address indexed _stakingToken,
        uint256 _lastRewardTimestamp,
        uint256 _lpSupply,
        uint256 _accPenpiePerShare
    );
    event HarvestPenpie(
        address indexed _account,
        address indexed _receiver,
        uint256 _amount,
        bool isLock
    );
    event UpdateEmissionRate(
        address indexed _user,
        uint256 _oldPenpiePerSec,
        uint256 _newPenpiePerSec
    );
    event UpdatePoolAlloc(
        address _stakingToken,
        uint256 _oldAllocPoint,
        uint256 _newAllocPoint
    );
    event PoolManagerStatus(address _account, bool _status);
    event VlPenpieUpdated(address _newvlPenpie, address _oldvlPenpie);
    event CompounderUpdated(address _newCompounder, address _oldCompounder);
    event mPendleSVUpdated(address _newMPendleSV, address _oldMPendleSV);
    event DepositNotAvailable(
        address indexed _user,
        address indexed _stakingToken,
        uint256 _amount
    );
    event PenpieOFTSet(address _penpie);
    event ARBRewarderSet(address _oldARBRewarder, address _newARBRewarder);
    event ARBRewarderSetAsQueuer(address rewarder);

    /* ============ Errors ============ */

    error OnlyPoolManager();
    error OnlyReceiptToken();
    error OnlyStakingToken();
    error OnlyActivePool();
    error PoolExisted();
    error InvalidStakingToken();
    error WithdrawAmountExceedsStaked();
    error UnlockAmountExceedsLocked();
    error MustBeContractOrZero();
    error OnlyVlPenpie();
    error OnlyMPendleSV();
    error PenpieOFTSetAlready();
    error MustBeContract();
    error LengthMismatch();
    error OnlyWhiteListedAllocaUpdator();
    error OnlyCompounder();
    error onlyARBRewarder();

    /* ============ Constructor ============ */

    constructor() {
        _disableInitializers();
    }

    function __MasterPenpie_init(
        address _penpieOFT,
        uint256 _penpiePerSec,
        uint256 _startTimestamp
    ) public initializer {
        __Ownable_init();
        __ReentrancyGuard_init();
        __Pausable_init();
        penpieOFT = IERC20(_penpieOFT);
        penpiePerSec = _penpiePerSec;
        startTimestamp = _startTimestamp;
        totalAllocPoint = 0;
        PoolManagers[owner()] = true;
    }

    /* ============ Modifiers ============ */

    modifier _onlyPoolManager() {
        if (!PoolManagers[msg.sender] && msg.sender != address(this))
            revert OnlyPoolManager();
        _;
    }

    modifier _onlyWhiteListed() {
        if (
            AllocationManagers[msg.sender] ||
            PoolManagers[msg.sender] ||
            msg.sender == owner()
        ) {
            _;
        } else {
            revert OnlyWhiteListedAllocaUpdator();
        }
    }

    modifier _onlyReceiptToken() {
        address stakingToken = receiptToStakeToken[msg.sender];
        if (msg.sender != address(tokenToPoolInfo[stakingToken].receiptToken))
            revert OnlyReceiptToken();
        _;
    }

    modifier _onlyVlPenpie() {
        if (msg.sender != address(vlPenpie)) revert OnlyVlPenpie();
        _;
    }
    
    modifier _onlyCompounder() {
        if (msg.sender != compounder)
            revert OnlyCompounder();
        _;
    }

    modifier _onlyMPendleSV() {
        if (msg.sender != address(mPendleSV))
            revert OnlyMPendleSV();
        _;
    } 

    /* ============ External Getters ============ */

    /// @notice Returns number of registered tokens, tokens having a registered pool.
    /// @return Returns number of registered tokens
    function poolLength() external view returns (uint256) {
        return registeredToken.length;
    }

    /// @notice Gives information about a Pool. Used for APR calculation and Front-End
    /// @param _stakingToken Staking token of the pool we want to get information from
    /// @return emission - Emissions of Penpie from the contract, allocpoint - Allocated emissions of Penpie to the pool,sizeOfPool - size of Pool, totalPoint total allocation points

    function getPoolInfo(
        address _stakingToken
    )
        external
        view
        returns (
            uint256 emission,
            uint256 allocpoint,
            uint256 sizeOfPool,
            uint256 totalPoint
        )
    {
        PoolInfo memory pool = tokenToPoolInfo[_stakingToken];
        return (
            ((penpiePerSec * pool.allocPoint) / totalAllocPoint),
            pool.allocPoint,
            pool.totalStaked,
            totalAllocPoint
        );
    }

    /**
     * @dev Get staking information for a user.
     * @param _stakingToken The address of the staking token.
     * @param _user The address of the user.
     * @return stakedAmount The amount of tokens staked by the user.
     * @return availableAmount The available amount of tokens for the user to withdraw.
     */
    function stakingInfo(
        address _stakingToken,
        address _user
    ) public view returns (uint256 stakedAmount, uint256 availableAmount) {
        return (
            userInfo[_stakingToken][_user].amount,
            userInfo[_stakingToken][_user].available
        );
    }

    /// @notice View function to see pending reward tokens on frontend.
    /// @param _stakingToken Staking token of the pool
    /// @param _user Address of the user
    /// @param _rewardToken Specific pending reward token, apart from Penpie
    /// @return pendingPenpie - Expected amount of Penpie the user can claim, bonusTokenAddress - token, bonusTokenSymbol - token Symbol,  pendingBonusToken - Expected amount of token the user can claim
    function pendingTokens(
        address _stakingToken,
        address _user,
        address _rewardToken
    )
        external
        view
        returns (
            uint256 pendingPenpie,
            address bonusTokenAddress,
            string memory bonusTokenSymbol,
            uint256 pendingBonusToken
        )
    {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        pendingPenpie = _calPenpieReward(_stakingToken, _user);

        // If it's a multiple reward farm, we return info about the specific bonus token
        if (
            address(pool.rewarder) != address(0) && _rewardToken != address(0)
        ) {
            (bonusTokenAddress, bonusTokenSymbol) = (
                _rewardToken,
                IERC20Metadata(_rewardToken).symbol()
            );
            pendingBonusToken = IBaseRewardPool(pool.rewarder).earned(
                _user,
                _rewardToken
            );
        }
    }

    function allPendingTokens(
        address _stakingToken,
        address _user
    )
        external
        view
        returns (
            uint256 pendingPenpie,
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols,
            uint256[] memory pendingBonusRewards
        )
    {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        pendingPenpie = _calPenpieReward(_stakingToken, _user);

        // If it's a multiple reward farm, we return all info about the bonus tokens
        if (address(pool.rewarder) != address(0)) {
            (bonusTokenAddresses, bonusTokenSymbols) = IBaseRewardPool(
                pool.rewarder
            ).rewardTokenInfos();
            pendingBonusRewards = IBaseRewardPool(pool.rewarder).allEarned(
                _user
            );
        }
    }

    function getRewarder(address stakingToken) external view returns(address){
        return tokenToPoolInfo[stakingToken].rewarder;
    }

    /* ============ External Functions ============ */

    /// @notice Deposits staking token to the pool, updates pool and distributes rewards
    /// @param _stakingToken Staking token of the pool
    /// @param _amount Amount to deposit to the pool
    function deposit(
        address _stakingToken,
        uint256 _amount
    ) external whenNotPaused nonReentrant {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        IMintableERC20(pool.receiptToken).mint(msg.sender, _amount);

        IERC20(pool.stakingToken).safeTransferFrom(
            address(msg.sender),
            address(this),
            _amount
        );
        emit Deposit(msg.sender, _stakingToken, pool.receiptToken, _amount);
    }

    function depositFor(
        address _stakingToken,
        address _for,
        uint256 _amount
    ) external whenNotPaused nonReentrant {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        IMintableERC20(pool.receiptToken).mint(_for, _amount);

        IERC20(pool.stakingToken).safeTransferFrom(
            address(msg.sender),
            address(this),
            _amount
        );
        emit Deposit(_for, _stakingToken, pool.receiptToken, _amount);
    }

    /// @notice Withdraw staking tokens from Master Penpie.
    /// @param _stakingToken Staking token of the pool
    /// @param _amount amount to withdraw
    function withdraw(
        address _stakingToken,
        uint256 _amount
    ) external whenNotPaused nonReentrant {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        IMintableERC20(pool.receiptToken).burn(msg.sender, _amount);

        IERC20(pool.stakingToken).safeTransfer(msg.sender, _amount);
        emit Withdraw(msg.sender, _stakingToken, pool.receiptToken, _amount);
    }

    /// @notice Update reward variables of the given pool to be up-to-date.
    /// @param _stakingToken Staking token of the pool
    function updatePool(address _stakingToken) public whenNotPaused {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        if (
            block.timestamp <= pool.lastRewardTimestamp || totalAllocPoint == 0
        ) {
            return;
        }
        uint256 lpSupply = pool.totalStaked;
        if (lpSupply == 0) {
            pool.lastRewardTimestamp = block.timestamp;
            return;
        }
        uint256 multiplier = block.timestamp - pool.lastRewardTimestamp;
        uint256 penpieReward = (multiplier * penpiePerSec * pool.allocPoint) /
            totalAllocPoint;

        pool.accPenpiePerShare =
            pool.accPenpiePerShare +
            ((penpieReward * 1e12) / lpSupply);
        pool.lastRewardTimestamp = block.timestamp;

        emit UpdatePool(
            _stakingToken,
            pool.lastRewardTimestamp,
            lpSupply,
            pool.accPenpiePerShare
        );
    }

    /// @notice Update reward variables for all pools. Be mindful of gas costs!
    function massUpdatePools() public whenNotPaused {
        for (uint256 pid = 0; pid < registeredToken.length; ++pid) {
            updatePool(registeredToken[pid]);
        }
    }

    /// @notice Claims for each of the pools with specified rewards to claim for each pool
    function multiclaimSpecPNP(
        address[] calldata _stakingTokens,
        address[][] memory _rewardTokens,
        bool _withPNP
    ) external whenNotPaused {
        _multiClaim(_stakingTokens, msg.sender, msg.sender, _rewardTokens, _withPNP);
    }


    /// @notice Claims for each of the pools with specified rewards to claim for each pool
    function multiclaimSpec(
        address[] calldata _stakingTokens,
        address[][] memory _rewardTokens
    ) external whenNotPaused {
        _multiClaim(_stakingTokens, msg.sender, msg.sender, _rewardTokens, true);
    }

    function multiclaimOnBehalf(address[] calldata _stakingTokens, address[][] memory _rewardTokens, address _account, bool _isClaimPNP)
        external whenNotPaused _onlyCompounder
    {
        _multiClaim(_stakingTokens, _account, msg.sender, _rewardTokens, _isClaimPNP);
    }

    /// @notice Claims for each of the pools with specified rewards to claim for each pool
    function multiclaimFor(
        address[] calldata _stakingTokens,
        address[][] memory _rewardTokens,
        address _account
    ) external whenNotPaused {
        _multiClaim(_stakingTokens, _account, _account, _rewardTokens, true);
    }

    /// @notice Claim for all rewards for the pools
    function multiclaim(
        address[] calldata _stakingTokens
    ) external whenNotPaused {
        address[][] memory rewardTokens = new address[][](
            _stakingTokens.length
        );
        
        _multiClaim(_stakingTokens, msg.sender, msg.sender, rewardTokens, true);
    }

    /* ============ penpie receipToken interaction Functions ============ */

    function beforeReceiptTokenTransfer(
        address _from,
        address _to,
        uint256 _amount
    ) external _onlyReceiptToken {
        address _stakingToken = receiptToStakeToken[msg.sender];
        updatePool(_stakingToken);

        if (_from != address(0)) _harvestRewards(_stakingToken, _from);

        if (_from != _to) _harvestRewards(_stakingToken, _to);
    }

    function afterReceiptTokenTransfer(
        address _from,
        address _to,
        uint256 _amount
    ) external _onlyReceiptToken {
        address _stakingToken = receiptToStakeToken[msg.sender];
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];

        if (_from != address(0)) {
            UserInfo storage from = userInfo[_stakingToken][_from];
            from.amount = from.amount - _amount;
            from.available = from.available - _amount;
            from.rewardDebt = (from.amount * pool.accPenpiePerShare) / 1e12;
        } else {
            // mint
            tokenToPoolInfo[_stakingToken].totalStaked += _amount;
        }

        if (_to != address(0)) {
            UserInfo storage to = userInfo[_stakingToken][_to];
            to.amount = to.amount + _amount;
            to.available = to.available + _amount;
            to.rewardDebt = (to.amount * pool.accPenpiePerShare) / 1e12;
        } else {
            // brun
            tokenToPoolInfo[_stakingToken].totalStaked -= _amount;
        }
    }

    /* ============ vlPenpie interaction Functions ============ */

    function depositVlPenpieFor(
        uint256 _amount,
        address _for
    ) external whenNotPaused nonReentrant _onlyVlPenpie {
        _deposit(address(vlPenpie), msg.sender, _for, _amount, true);
    }

    function withdrawVlPenpieFor(
        uint256 _amount,
        address _for
    ) external whenNotPaused nonReentrant _onlyVlPenpie {
        _withdraw(address(vlPenpie), _for, _amount, true);
    }

    function depositMPendleSVFor(
        uint256 _amount,
        address _for
    ) external whenNotPaused _onlyMPendleSV() {
        _deposit(address(mPendleSV), msg.sender,_for, _amount, true);
    }

    function withdrawMPendleSVFor(
        uint256 _amount,
        address _for
    ) external whenNotPaused _onlyMPendleSV() {
        _withdraw(address(mPendleSV), _for, _amount, true);
    }    

    /* ============ Internal Functions ============ */

    /// @notice internal function to deal with deposit staking token
    function _deposit(
        address _stakingToken,
        address _from,
        address _for,
        uint256 _amount,
        bool _isLock
    ) internal {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        UserInfo storage user = userInfo[_stakingToken][_for];

        updatePool(_stakingToken);
        _harvestRewards(_stakingToken, _for);

        user.amount = user.amount + _amount;
        if (!_isLock) {
            user.available = user.available + _amount;
            IERC20(pool.stakingToken).safeTransferFrom(
                address(_from),
                address(this),
                _amount
            );
        }
        user.rewardDebt = (user.amount * pool.accPenpiePerShare) / 1e12;

        if (_amount > 0) {
            pool.totalStaked += _amount;
            if (!_isLock)
                emit Deposit(_for, _stakingToken, pool.receiptToken, _amount);
            else emit DepositNotAvailable(_for, _stakingToken, _amount);
        }
    }

    /// @notice internal function to deal with withdraw staking token
    function _withdraw(
        address _stakingToken,
        address _account,
        uint256 _amount,
        bool _isLock
    ) internal {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        UserInfo storage user = userInfo[_stakingToken][_account];

        if (!_isLock && user.available < _amount)
            revert WithdrawAmountExceedsStaked();
        else if (user.amount < _amount && _isLock)
            revert UnlockAmountExceedsLocked();

        updatePool(_stakingToken);
        _harvestPenpie(_stakingToken, _account);
        _harvestBaseRewarder(_stakingToken, _account);

        user.amount = user.amount - _amount;
        if (!_isLock) {
            user.available = user.available - _amount;
            IERC20(tokenToPoolInfo[_stakingToken].stakingToken).safeTransfer(
                address(msg.sender),
                _amount
            );
        }
        user.rewardDebt = (user.amount * pool.accPenpiePerShare) / 1e12;

        pool.totalStaked -= _amount;

        emit Withdraw(_account, _stakingToken, pool.receiptToken, _amount);
    }

    function _multiClaim(
        address[] calldata _stakingTokens,
        address _user,
        address _receiver,
        address[][] memory _rewardTokens,
        bool _withPnp
    ) internal nonReentrant {
        uint256 length = _stakingTokens.length;
        if (length != _rewardTokens.length) revert LengthMismatch();

        uint256 vlPenpiePoolAmount;
        uint256 defaultPoolAmount;

        for (uint256 i = 0; i < length; ++i) {
            address _stakingToken = _stakingTokens[i];
            UserInfo storage user = userInfo[_stakingToken][_user];

            updatePool(_stakingToken);
            uint256 claimablePenpie = _calNewPenpie(_stakingToken, _user) +
                user.unClaimedPenpie;

            // if claim with PNP, then unclamed is 0
            if (_withPnp) {
                if (_stakingToken == address(vlPenpie)) {
                    vlPenpiePoolAmount += claimablePenpie;
                } else {
                    defaultPoolAmount += claimablePenpie;
                }
                user.unClaimedPenpie = 0;
            } else {
                user.unClaimedPenpie = claimablePenpie;
            }

            user.rewardDebt =
                (user.amount *
                    tokenToPoolInfo[_stakingToken].accPenpiePerShare) /
                1e12;
            _claimBaseRewarder(
                _stakingToken,
                _user,
                _receiver,
                _rewardTokens[i]
            );
        }

        // if not claiming PNP, early return
        if (!_withPnp) return;

        if (vlPenpiePoolAmount > 0) {
            _sendPenpieForVlPenpiePool(_user, _receiver, vlPenpiePoolAmount);
        }

        if (defaultPoolAmount > 0) {
            _sendPenpie(_user, _receiver, defaultPoolAmount);
        }
    }

    /// @notice calculate Penpie reward based at current timestamp, for frontend only
    function _calPenpieReward(
        address _stakingToken,
        address _user
    ) internal view returns (uint256 pendingPenpie) {
        PoolInfo storage pool = tokenToPoolInfo[_stakingToken];
        UserInfo storage user = userInfo[_stakingToken][_user];
        uint256 accPenpiePerShare = pool.accPenpiePerShare;

        if (
            block.timestamp > pool.lastRewardTimestamp && pool.totalStaked != 0
        ) {
            uint256 multiplier = block.timestamp - pool.lastRewardTimestamp;
            uint256 penpieReward = (multiplier *
                penpiePerSec *
                pool.allocPoint) / totalAllocPoint;
            accPenpiePerShare =
                accPenpiePerShare +
                (penpieReward * 1e12) /
                pool.totalStaked;
        }

        pendingPenpie =
            (user.amount * accPenpiePerShare) /
            1e12 -
            user.rewardDebt;
        pendingPenpie += user.unClaimedPenpie;
    }

    function _harvestRewards(address _stakingToken, address _account) internal {
        if (userInfo[_stakingToken][_account].amount > 0) {
            _harvestPenpie(_stakingToken, _account);
        }
        _harvestBaseRewarder(_stakingToken, _account);
    }

    /// @notice Harvest Penpie for an account
    /// only update the reward counting but not sending them to user
    function _harvestPenpie(address _stakingToken, address _account) internal {
        // Harvest Penpie
        uint256 pending = _calNewPenpie(_stakingToken, _account);
        userInfo[_stakingToken][_account].unClaimedPenpie += pending;
    }

    /// @notice calculate Penpie reward based on current accPenpiePerShare
    function _calNewPenpie(
        address _stakingToken,
        address _account
    ) internal view returns (uint256) {
        UserInfo storage user = userInfo[_stakingToken][_account];
        uint256 pending = (user.amount *
            tokenToPoolInfo[_stakingToken].accPenpiePerShare) /
            1e12 -
            user.rewardDebt;
        return pending;
    }

    /// @notice Harvest reward token in BaseRewarder for an account. NOTE: Baserewarder use user staking token balance as source to
    /// calculate reward token amount
    function _claimBaseRewarder(
        address _stakingToken,
        address _account,
        address _receiver,
        address[] memory _rewardTokens
    ) internal {
        IBaseRewardPool rewarder = IBaseRewardPool(
            tokenToPoolInfo[_stakingToken].rewarder
        );
        if (address(rewarder) != address(0)) {
            if (_rewardTokens.length > 0) {
                rewarder.getRewards(_account, _receiver, _rewardTokens);
                // if not specifiying any reward token, just claim them all
            } else {
                rewarder.getReward(_account, _receiver);
            }
        }
    }

    /// only update the reward counting on in base rewarder but not sending them to user
    function _harvestBaseRewarder(
        address _stakingToken,
        address _account
    ) internal {
        IBaseRewardPool rewarder = IBaseRewardPool(
            tokenToPoolInfo[_stakingToken].rewarder
        );

        if(address(ARBRewarder) != address(0) && address(rewarder) != address(0))
            IARBRewarder(ARBRewarder).harvestARB(_stakingToken, address(rewarder));
            
        if (address(rewarder) != address(0)) rewarder.updateFor(_account);

    }

    function _sendPenpieForVlPenpiePool(
        address _account,
        address _receiver,
        uint256 _amount
    ) internal {
        address vlPenpieRewarder = tokenToPoolInfo[address(vlPenpie)].rewarder;
        penpieOFT.safeApprove(vlPenpieRewarder, _amount);
        IVLPenpieBaseRewarder(vlPenpieRewarder).queuePenpie(
            _amount,
            _account,
            _receiver
        );

        emit HarvestPenpie(_account, _receiver, _amount, false);
    }

    function _sendPenpie(
        address _account,
        address _receiver,
        uint256 _amount
    ) internal {
        penpieOFT.safeTransfer(_receiver, _amount);

        emit HarvestPenpie(_account, _receiver, _amount, false);
    }

    function _addPool(
        uint256 _allocPoint,
        address _stakingToken,
        address _receiptToken,
        address _rewarder
    ) internal {
        if (
            !Address.isContract(address(_stakingToken)) ||
            !Address.isContract(address(_receiptToken))
        ) revert InvalidStakingToken();

        if (
            !Address.isContract(address(_rewarder)) &&
            address(_rewarder) != address(0)
        ) revert MustBeContractOrZero();

        if (tokenToPoolInfo[_stakingToken].isActive) revert PoolExisted();

        // massUpdatePools();
        uint256 lastRewardTimestamp = block.timestamp > startTimestamp
            ? block.timestamp
            : startTimestamp;
        totalAllocPoint = totalAllocPoint + _allocPoint;
        registeredToken.push(_stakingToken);
        // it's receipt token as the registered token
        tokenToPoolInfo[_stakingToken] = PoolInfo({
            receiptToken: _receiptToken,
            stakingToken: _stakingToken,
            allocPoint: _allocPoint,
            lastRewardTimestamp: lastRewardTimestamp,
            accPenpiePerShare: 0,
            totalStaked: 0,
            rewarder: _rewarder,
            isActive: true
        });

        receiptToStakeToken[_receiptToken] = _stakingToken;

        emit Add(
            _allocPoint,
            _stakingToken,
            _receiptToken,
            IBaseRewardPool(_rewarder)
        );
    }

    /* ============ Admin Functions ============ */
    /// @notice Used to give edit rights to the pools in this contract to a Pool Manager
    /// @param _account Pool Manager Adress
    /// @param _allowedManager True gives rights, False revokes them
    function setPoolManagerStatus(
        address _account,
        bool _allowedManager
    ) external onlyOwner {
        PoolManagers[_account] = _allowedManager;

        emit PoolManagerStatus(_account, PoolManagers[_account]);
    }

    function setPenpie(address _penpieOFT) external onlyOwner {
        if (address(penpieOFT) != address(0)) revert PenpieOFTSetAlready();

        if (!Address.isContract(_penpieOFT)) revert MustBeContract();

        penpieOFT = IERC20(_penpieOFT);
        emit PenpieOFTSet(_penpieOFT);
    }

    function setCompounder(address _compounder)
        external
        onlyOwner
    {
        address oldCompounder = compounder;
        compounder = _compounder;
        emit CompounderUpdated(compounder, oldCompounder);
    }

    function setVlPenpie(address _vlPenpie) external onlyOwner {
        address oldvlPenpie = address(vlPenpie);
        vlPenpie = IVLPenpie(_vlPenpie);
        emit VlPenpieUpdated(address(vlPenpie), oldvlPenpie);
    }

    function setMPendleSV(address _mPendleSV)
        external
        onlyOwner
    {
        address oldMPendleSV = mPendleSV;
        mPendleSV = _mPendleSV;
        emit mPendleSVUpdated(_mPendleSV, oldMPendleSV);
    }

    /**
     * @dev pause pool, restricting certain operations
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @dev unpause pool, enabling certain operations
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /// @notice Add a new rewarder to the pool. Can only be called by a PoolManager.
    /// @param _receiptToken receipt token of the pool
    /// @param mainRewardToken Token that will be rewarded for staking in the pool
    /// @return address of the rewarder created
    function createRewarder(
        address _receiptToken,
        address mainRewardToken
    ) external _onlyPoolManager returns (address) {
        address rewarder = ERC20FactoryLib.createRewarder(
            _receiptToken,
            mainRewardToken,
            address(this),
            msg.sender
        );

        return rewarder;
    }

    /// @notice Add a new penlde marekt pool. Explicitly for Pendle Market pools and should be called from Pendle Staking.
    function add(
        uint256 _allocPoint,
        address _stakingToken,
        address _receiptToken,
        address _rewarder
    ) external _onlyPoolManager {
        _addPool(_allocPoint, _stakingToken, _receiptToken, _rewarder);
    }

    /// @notice Add a new pool that does not mint receipt token. Mainly for locker pool such as vlPNP, mPendleSV
    function createNoReceiptPool(
        uint256 _allocPoint,
        address _stakingToken,
        address _rewarder
    ) external onlyOwner {
        _addPool(_allocPoint, _stakingToken, _stakingToken, _rewarder);
    }

    function createPool(
        uint256 _allocPoint,
        address _stakingToken,
        string memory _receiptName,
        string memory _receiptSymbol
    ) external onlyOwner {
        IERC20 newToken = IERC20(
            ERC20FactoryLib.createReceipt(
                address(_stakingToken),
                address(this),
                _receiptName,
                _receiptSymbol
            )
        );

        address rewarder = this.createRewarder(address(newToken), address(0));

        _addPool(_allocPoint, _stakingToken, address(newToken), rewarder);
    }

    /// @notice Updates the given pool's Penpie allocation point, rewarder address and locker address if overwritten. Can only be called by a Pool Manager.
    /// @param _stakingToken Staking token of the pool
    /// @param _allocPoint Allocation points of Penpie to the pool
    /// @param _rewarder Address of the rewarder for the pool
    function set(
        address _stakingToken,
        uint256 _allocPoint,
        address _rewarder
    ) external _onlyPoolManager {
        if (
            !Address.isContract(address(_rewarder)) &&
            address(_rewarder) != address(0)
        ) revert MustBeContractOrZero();

        if (!tokenToPoolInfo[_stakingToken].isActive) revert OnlyActivePool();

        // massUpdatePools();

        totalAllocPoint =
            totalAllocPoint -
            tokenToPoolInfo[_stakingToken].allocPoint +
            _allocPoint;

        tokenToPoolInfo[_stakingToken].allocPoint = _allocPoint;
        tokenToPoolInfo[_stakingToken].rewarder = _rewarder;

        emit Set(
            _stakingToken,
            _allocPoint,
            IBaseRewardPool(tokenToPoolInfo[_stakingToken].rewarder)
        );
    }

    /// @notice Update the emission rate of Penpie for MasterMagpie
    /// @param _penpiePerSec new emission per second
    function updateEmissionRate(uint256 _penpiePerSec) public onlyOwner {
        massUpdatePools();
        uint256 oldEmissionRate = penpiePerSec;
        penpiePerSec = _penpiePerSec;

        emit UpdateEmissionRate(msg.sender, oldEmissionRate, penpiePerSec);
    }

    function updatePoolsAlloc(
        address[] calldata _stakingTokens,
        uint256[] calldata _allocPoints
    ) external _onlyWhiteListed {
        // massUpdatePools();

        if (_stakingTokens.length != _allocPoints.length)
            revert LengthMismatch();

        for (uint256 i = 0; i < _stakingTokens.length; i++) {
            uint256 oldAllocPoint = tokenToPoolInfo[_stakingTokens[i]]
                .allocPoint;

            totalAllocPoint = totalAllocPoint - oldAllocPoint + _allocPoints[i];

            tokenToPoolInfo[_stakingTokens[i]].allocPoint = _allocPoints[i];

            emit UpdatePoolAlloc(
                _stakingTokens[i],
                oldAllocPoint,
                _allocPoints[i]
            );
        }
    }

    function updateWhitelistedAllocManager(
        address _account,
        bool _allowed
    ) external onlyOwner {
        AllocationManagers[_account] = _allowed;
    }

    function updateRewarderQueuer(
        address _rewarder,
        address _manager,
        bool _allowed
    ) external onlyOwner {
        IBaseRewardPool rewarder = IBaseRewardPool(_rewarder);
        rewarder.updateRewardQueuer(_manager, _allowed);
    }

    function setARBRewarder(address _ARBRewarder) external onlyOwner{
        address oldARBRewarder = ARBRewarder;
        ARBRewarder = _ARBRewarder;

        emit ARBRewarderSet(oldARBRewarder, ARBRewarder);
    }

    function setARBRewarderAsQueuer(address[] calldata _pools) external onlyOwner {

        for(uint256 index = 0; index < _pools.length; index++){
            address _stakingToken = _pools[index];
            address rewarder = tokenToPoolInfo[_stakingToken].rewarder;
            if(rewarder != address(0)){
                IBaseRewardPool(rewarder).updateRewardQueuer(ARBRewarder, true);
                emit ARBRewarderSetAsQueuer(rewarder);
            }
        }
    }

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ILayerZeroUserApplicationConfig.sol";

interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;

    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;

    // @notice get the inboundNonce of a lzApp from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);

    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);

    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);

    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);

    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;

    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);

    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);

    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);

    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);

    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);

    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);

    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);

    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;

    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;

    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;

    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "../interfaces/ILayerZeroReceiver.sol";
import "../interfaces/ILayerZeroUserApplicationConfig.sol";
import "../interfaces/ILayerZeroEndpoint.sol";
import "../util/BytesLib.sol";

/*
 * a generic LzReceiver implementation
 */
abstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    using BytesLib for bytes;

    // ua can not send payload larger than this by default, but it can be changed by the ua owner
    uint constant public DEFAULT_PAYLOAD_SIZE_LIMIT = 10000;

    ILayerZeroEndpoint public immutable lzEndpoint;
    mapping(uint16 => bytes) public trustedRemoteLookup;
    mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup;
    mapping(uint16 => uint) public payloadSizeLimitLookup;
    address public precrime;

    event SetPrecrime(address precrime);
    event SetTrustedRemote(uint16 _remoteChainId, bytes _path);
    event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress);
    event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas);

    constructor(address _endpoint) {
        lzEndpoint = ILayerZeroEndpoint(_endpoint);
    }

    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public virtual override {
        // lzReceive must be called by the endpoint for security
        require(_msgSender() == address(lzEndpoint), "LzApp: invalid endpoint caller");

        bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];
        // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote.
        require(_srcAddress.length == trustedRemote.length && trustedRemote.length > 0 && keccak256(_srcAddress) == keccak256(trustedRemote), "LzApp: invalid source sending contract");

        _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }

    // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging
    function _blockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual;

    function _lzSend(uint16 _dstChainId, bytes memory _payload, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams, uint _nativeFee) internal virtual {
        bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];
        require(trustedRemote.length != 0, "LzApp: destination chain is not a trusted source");
        _checkPayloadSize(_dstChainId, _payload.length);
        lzEndpoint.send{value: _nativeFee}(_dstChainId, trustedRemote, _payload, _refundAddress, _zroPaymentAddress, _adapterParams);
    }

    function _checkGasLimit(uint16 _dstChainId, uint16 _type, bytes memory _adapterParams, uint _extraGas) internal view virtual {
        uint providedGasLimit = _getGasLimit(_adapterParams);
        uint minGasLimit = minDstGasLookup[_dstChainId][_type] + _extraGas;
        require(minGasLimit > 0, "LzApp: minGasLimit not set");
        require(providedGasLimit >= minGasLimit, "LzApp: gas limit is too low");
    }

    function _getGasLimit(bytes memory _adapterParams) internal pure virtual returns (uint gasLimit) {
        require(_adapterParams.length >= 34, "LzApp: invalid adapterParams");
        assembly {
            gasLimit := mload(add(_adapterParams, 34))
        }
    }

    function _checkPayloadSize(uint16 _dstChainId, uint _payloadSize) internal view virtual {
        uint payloadSizeLimit = payloadSizeLimitLookup[_dstChainId];
        if (payloadSizeLimit == 0) { // use default if not set
            payloadSizeLimit = DEFAULT_PAYLOAD_SIZE_LIMIT;
        }
        require(_payloadSize <= payloadSizeLimit, "LzApp: payload size is too large");
    }

    //---------------------------UserApplication config----------------------------------------
    function getConfig(uint16 _version, uint16 _chainId, address, uint _configType) external view returns (bytes memory) {
        return lzEndpoint.getConfig(_version, _chainId, address(this), _configType);
    }

    // generic config for LayerZero user Application
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external override onlyOwner {
        lzEndpoint.setConfig(_version, _chainId, _configType, _config);
    }

    function setSendVersion(uint16 _version) external override onlyOwner {
        lzEndpoint.setSendVersion(_version);
    }

    function setReceiveVersion(uint16 _version) external override onlyOwner {
        lzEndpoint.setReceiveVersion(_version);
    }

    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }

    // _path = abi.encodePacked(remoteAddress, localAddress)
    // this function set the trusted path for the cross-chain communication
    function setTrustedRemote(uint16 _srcChainId, bytes calldata _path) external onlyOwner {
        trustedRemoteLookup[_srcChainId] = _path;
        emit SetTrustedRemote(_srcChainId, _path);
    }

    function setTrustedRemoteAddress(uint16 _remoteChainId, bytes calldata _remoteAddress) external onlyOwner {
        trustedRemoteLookup[_remoteChainId] = abi.encodePacked(_remoteAddress, address(this));
        emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress);
    }

    function getTrustedRemoteAddress(uint16 _remoteChainId) external view returns (bytes memory) {
        bytes memory path = trustedRemoteLookup[_remoteChainId];
        require(path.length != 0, "LzApp: no trusted path record");
        return path.slice(0, path.length - 20); // the last 20 bytes should be address(this)
    }

    function setPrecrime(address _precrime) external onlyOwner {
        precrime = _precrime;
        emit SetPrecrime(_precrime);
    }

    function setMinDstGas(uint16 _dstChainId, uint16 _packetType, uint _minGas) external onlyOwner {
        require(_minGas > 0, "LzApp: invalid minGas");
        minDstGasLookup[_dstChainId][_packetType] = _minGas;
        emit SetMinDstGas(_dstChainId, _packetType, _minGas);
    }

    // if the size is 0, it means default size limit
    function setPayloadSizeLimit(uint16 _dstChainId, uint _size) external onlyOwner {
        payloadSizeLimitLookup[_dstChainId] = _size;
    }

    //--------------------------- VIEW FUNCTION ----------------------------------------
    function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) {
        bytes memory trustedSource = trustedRemoteLookup[_srcChainId];
        return keccak256(trustedSource) == keccak256(_srcAddress);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./LzApp.sol";
import "../util/ExcessivelySafeCall.sol";

/*
 * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel
 * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking
 * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress)
 */
abstract contract NonblockingLzApp is LzApp {
    using ExcessivelySafeCall for address;

    constructor(address _endpoint) LzApp(_endpoint) {}

    mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages;

    event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload, bytes _reason);
    event RetryMessageSuccess(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _payloadHash);

    // overriding the virtual function in LzReceiver
    function _blockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual override {
        (bool success, bytes memory reason) = address(this).excessivelySafeCall(gasleft(), 150, abi.encodeWithSelector(this.nonblockingLzReceive.selector, _srcChainId, _srcAddress, _nonce, _payload));
        // try-catch all errors/exceptions
        if (!success) {
            _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason);
        }
    }

    function _storeFailedMessage(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload, bytes memory _reason) internal virtual {
        failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload);
        emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason);
    }

    function nonblockingLzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public virtual {
        // only internal transaction
        require(_msgSender() == address(this), "NonblockingLzApp: caller must be LzApp");
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }

    //@notice override this function
    function _nonblockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual;

    function retryMessage(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public payable virtual {
        // assert there is message to retry
        bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce];
        require(payloadHash != bytes32(0), "NonblockingLzApp: no stored message");
        require(keccak256(_payload) == payloadHash, "NonblockingLzApp: invalid payload");
        // clear the stored message
        failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0);
        // execute the message. revert if it fails again
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
        emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./OFTCoreV2.sol";
import "./IOFTV2.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

abstract contract BaseOFTV2 is OFTCoreV2, ERC165, IOFTV2 {

    constructor(uint8 _sharedDecimals, address _lzEndpoint) OFTCoreV2(_sharedDecimals, _lzEndpoint) {
    }

    /************************************************************************
    * public functions
    ************************************************************************/
    function sendFrom(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, LzCallParams calldata _callParams) public payable virtual override {
        _send(_from, _dstChainId, _toAddress, _amount, _callParams.refundAddress, _callParams.zroPaymentAddress, _callParams.adapterParams);
    }

    function sendAndCall(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, LzCallParams calldata _callParams) public payable virtual override {
        _sendAndCall(_from, _dstChainId, _toAddress, _amount, _payload, _dstGasForCall, _callParams.refundAddress, _callParams.zroPaymentAddress, _callParams.adapterParams);
    }

    /************************************************************************
    * public view functions
    ************************************************************************/
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IOFTV2).interfaceId || super.supportsInterface(interfaceId);
    }

    function estimateSendFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) public view virtual override returns (uint nativeFee, uint zroFee) {
        return _estimateSendFee(_dstChainId, _toAddress, _amount, _useZro, _adapterParams);
    }

    function estimateSendAndCallFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, bool _useZro, bytes calldata _adapterParams) public view virtual override returns (uint nativeFee, uint zroFee) {
        return _estimateSendAndCallFee(_dstChainId, _toAddress, _amount, _payload, _dstGasForCall, _useZro, _adapterParams);
    }

    function circulatingSupply() public view virtual override returns (uint);

    function token() public view virtual override returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Interface of the IOFT core standard
 */
interface ICommonOFT is IERC165 {

    struct LzCallParams {
        address payable refundAddress;
        address zroPaymentAddress;
        bytes adapterParams;
    }

    /**
     * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`)
     * _dstChainId - L0 defined chain id to send tokens too
     * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain
     * _amount - amount of the tokens to transfer
     * _useZro - indicates to use zro to pay L0 fees
     * _adapterParam - flexible bytes array to indicate messaging adapter services in L0
     */
    function estimateSendFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);

    function estimateSendAndCallFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);

    /**
     * @dev returns the circulating amount of tokens on current chain
     */
    function circulatingSupply() external view returns (uint);

    /**
     * @dev returns the address of the ERC20 token
     */
    function token() external view returns (address);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.5.0;

interface IOFTReceiverV2 {
    /**
     * @dev Called by the OFT contract when tokens are received from source chain.
     * @param _srcChainId The chain id of the source chain.
     * @param _srcAddress The address of the OFT token contract on the source chain.
     * @param _nonce The nonce of the transaction on the source chain.
     * @param _from The address of the account who calls the sendAndCall() on the source chain.
     * @param _amount The amount of tokens to transfer.
     * @param _payload Additional data with no specified format.
     */
    function onOFTReceived(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes32 _from, uint _amount, bytes calldata _payload) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ICommonOFT.sol";

/**
 * @dev Interface of the IOFT core standard
 */
interface IOFTV2 is ICommonOFT {

    /**
     * @dev send `_amount` amount of token to (`_dstChainId`, `_toAddress`) from `_from`
     * `_from` the owner of token
     * `_dstChainId` the destination chain identifier
     * `_toAddress` can be any size depending on the `dstChainId`.
     * `_amount` the quantity of tokens in wei
     * `_refundAddress` the address LayerZero refunds if too much message fee is sent
     * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token)
     * `_adapterParams` is a flexible bytes array to indicate messaging adapter services
     */
    function sendFrom(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, LzCallParams calldata _callParams) external payable;

    function sendAndCall(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, LzCallParams calldata _callParams) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../../lzApp/NonblockingLzApp.sol";
import "../../../util/ExcessivelySafeCall.sol";
import "./ICommonOFT.sol";
import "./IOFTReceiverV2.sol";

abstract contract OFTCoreV2 is NonblockingLzApp {
    using BytesLib for bytes;
    using ExcessivelySafeCall for address;

    uint public constant NO_EXTRA_GAS = 0;

    // packet type
    uint8 public constant PT_SEND = 0;
    uint8 public constant PT_SEND_AND_CALL = 1;

    uint8 public immutable sharedDecimals;

    bool public useCustomAdapterParams;
    mapping(uint16 => mapping(bytes => mapping(uint64 => bool))) public creditedPackets;

    /**
     * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)
     * `_nonce` is the outbound nonce
     */
    event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes32 indexed _toAddress, uint _amount);

    /**
     * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain.
     * `_nonce` is the inbound nonce.
     */
    event ReceiveFromChain(uint16 indexed _srcChainId, address indexed _to, uint _amount);

    event SetUseCustomAdapterParams(bool _useCustomAdapterParams);

    event CallOFTReceivedSuccess(uint16 indexed _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _hash);

    event NonContractAddress(address _address);

    // _sharedDecimals should be the minimum decimals on all chains
    constructor(uint8 _sharedDecimals, address _lzEndpoint) NonblockingLzApp(_lzEndpoint) {
        sharedDecimals = _sharedDecimals;
    }

    /************************************************************************
    * public functions
    ************************************************************************/
    function callOnOFTReceived(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes32 _from, address _to, uint _amount, bytes calldata _payload, uint _gasForCall) public virtual {
        require(_msgSender() == address(this), "OFTCore: caller must be OFTCore");

        // send
        _amount = _transferFrom(address(this), _to, _amount);
        emit ReceiveFromChain(_srcChainId, _to, _amount);

        // call
        IOFTReceiverV2(_to).onOFTReceived{gas: _gasForCall}(_srcChainId, _srcAddress, _nonce, _from, _amount, _payload);
    }

    function setUseCustomAdapterParams(bool _useCustomAdapterParams) public virtual onlyOwner {
        useCustomAdapterParams = _useCustomAdapterParams;
        emit SetUseCustomAdapterParams(_useCustomAdapterParams);
    }

    /************************************************************************
    * internal functions
    ************************************************************************/
    function _estimateSendFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bool _useZro, bytes memory _adapterParams) internal view virtual returns (uint nativeFee, uint zroFee) {
        // mock the payload for sendFrom()
        bytes memory payload = _encodeSendPayload(_toAddress, _ld2sd(_amount));
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    function _estimateSendAndCallFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes memory _payload, uint64 _dstGasForCall, bool _useZro, bytes memory _adapterParams) internal view virtual returns (uint nativeFee, uint zroFee) {
        // mock the payload for sendAndCall()
        bytes memory payload = _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(_amount), _payload, _dstGasForCall);
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    function _nonblockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual override {
        uint8 packetType = _payload.toUint8(0);

        if (packetType == PT_SEND) {
            _sendAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else if (packetType == PT_SEND_AND_CALL) {
            _sendAndCallAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else {
            revert("OFTCore: unknown packet type");
        }
    }

    function _send(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams) internal virtual returns (uint amount) {
        _checkAdapterParams(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS);

        (amount,) = _removeDust(_amount);
        amount = _debitFrom(_from, _dstChainId, _toAddress, amount); // amount returned should not have dust
        require(amount > 0, "OFTCore: amount too small");

        bytes memory lzPayload = _encodeSendPayload(_toAddress, _ld2sd(amount));
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);

        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }

    function _sendAck(uint16 _srcChainId, bytes memory, uint64, bytes memory _payload) internal virtual {
        (address to, uint64 amountSD) = _decodeSendPayload(_payload);
        if (to == address(0)) {
            to = address(0xdead);
        }

        uint amount = _sd2ld(amountSD);
        amount = _creditTo(_srcChainId, to, amount);

        emit ReceiveFromChain(_srcChainId, to, amount);
    }

    function _sendAndCall(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes memory _payload, uint64 _dstGasForCall, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams) internal virtual returns (uint amount) {
        _checkAdapterParams(_dstChainId, PT_SEND_AND_CALL, _adapterParams, _dstGasForCall);

        (amount,) = _removeDust(_amount);
        amount = _debitFrom(_from, _dstChainId, _toAddress, amount);
        require(amount > 0, "OFTCore: amount too small");

        // encode the msg.sender into the payload instead of _from
        bytes memory lzPayload = _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(amount), _payload, _dstGasForCall);
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);

        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }

    function _sendAndCallAck(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual {
        (bytes32 from, address to, uint64 amountSD, bytes memory payloadForCall, uint64 gasForCall) = _decodeSendAndCallPayload(_payload);

        bool credited = creditedPackets[_srcChainId][_srcAddress][_nonce];
        uint amount = _sd2ld(amountSD);

        // credit to this contract first, and then transfer to receiver only if callOnOFTReceived() succeeds
        if (!credited) {
            amount = _creditTo(_srcChainId, address(this), amount);
            creditedPackets[_srcChainId][_srcAddress][_nonce] = true;
        }

        if (!_isContract(to)) {
            emit NonContractAddress(to);
            return;
        }

        // workaround for stack too deep
        uint16 srcChainId = _srcChainId;
        bytes memory srcAddress = _srcAddress;
        uint64 nonce = _nonce;
        bytes memory payload = _payload;
        bytes32 from_ = from;
        address to_ = to;
        uint amount_ = amount;
        bytes memory payloadForCall_ = payloadForCall;

        // no gas limit for the call if retry
        uint gas = credited ? gasleft() : gasForCall;
        (bool success, bytes memory reason) = address(this).excessivelySafeCall(gasleft(), 150, abi.encodeWithSelector(this.callOnOFTReceived.selector, srcChainId, srcAddress, nonce, from_, to_, amount_, payloadForCall_, gas));

        if (success) {
            bytes32 hash = keccak256(payload);
            emit CallOFTReceivedSuccess(srcChainId, srcAddress, nonce, hash);
        } else {
            // store the failed message into the nonblockingLzApp
            _storeFailedMessage(srcChainId, srcAddress, nonce, payload, reason);
        }
    }

    function _isContract(address _account) internal view returns (bool) {
        return _account.code.length > 0;
    }

    function _checkAdapterParams(uint16 _dstChainId, uint16 _pkType, bytes memory _adapterParams, uint _extraGas) internal virtual {
        if (useCustomAdapterParams) {
            _checkGasLimit(_dstChainId, _pkType, _adapterParams, _extraGas);
        } else {
            require(_adapterParams.length == 0, "OFTCore: _adapterParams must be empty.");
        }
    }

    function _ld2sd(uint _amount) internal virtual view returns (uint64) {
        uint amountSD = _amount / _ld2sdRate();
        require(amountSD <= type(uint64).max, "OFTCore: amountSD overflow");
        return uint64(amountSD);
    }

    function _sd2ld(uint64 _amountSD) internal virtual view returns (uint) {
        return _amountSD * _ld2sdRate();
    }

    function _removeDust(uint _amount) internal virtual view returns (uint amountAfter, uint dust) {
        dust = _amount % _ld2sdRate();
        amountAfter = _amount - dust;
    }

    function _encodeSendPayload(bytes32 _toAddress, uint64 _amountSD) internal virtual view returns (bytes memory) {
        return abi.encodePacked(PT_SEND, _toAddress, _amountSD);
    }

    function _decodeSendPayload(bytes memory _payload) internal virtual view returns (address to, uint64 amountSD) {
        require(_payload.toUint8(0) == PT_SEND && _payload.length == 41, "OFTCore: invalid payload");

        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
        amountSD = _payload.toUint64(33);
    }

    function _encodeSendAndCallPayload(address _from, bytes32 _toAddress, uint64 _amountSD, bytes memory _payload, uint64 _dstGasForCall) internal virtual view returns (bytes memory) {
        return abi.encodePacked(
            PT_SEND_AND_CALL,
            _toAddress,
            _amountSD,
            _addressToBytes32(_from),
            _dstGasForCall,
            _payload
        );
    }

    function _decodeSendAndCallPayload(bytes memory _payload) internal virtual view returns (bytes32 from, address to, uint64 amountSD, bytes memory payload, uint64 dstGasForCall) {
        require(_payload.toUint8(0) == PT_SEND_AND_CALL, "OFTCore: invalid payload");

        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
        amountSD = _payload.toUint64(33);
        from = _payload.toBytes32(41);
        dstGasForCall = _payload.toUint64(73);
        payload = _payload.slice(81, _payload.length - 81);
    }

    function _addressToBytes32(address _address) internal pure virtual returns (bytes32) {
        return bytes32(uint(uint160(_address)));
    }

    function _debitFrom(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount) internal virtual returns (uint);

    function _creditTo(uint16 _srcChainId, address _toAddress, uint _amount) internal virtual returns (uint);

    function _transferFrom(address _from, address _to, uint _amount) internal virtual returns (uint);

    function _ld2sdRate() internal view virtual returns (uint);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./BaseOFTV2.sol";

contract OFTV2 is BaseOFTV2, ERC20 {

    uint internal immutable ld2sdRate;

    constructor(string memory _name, string memory _symbol, uint8 _sharedDecimals, address _lzEndpoint) ERC20(_name, _symbol) BaseOFTV2(_sharedDecimals, _lzEndpoint) {
        uint8 decimals = decimals();
        require(_sharedDecimals <= decimals, "OFT: sharedDecimals must be <= decimals");
        ld2sdRate = 10 ** (decimals - _sharedDecimals);
    }

    /************************************************************************
    * public functions
    ************************************************************************/
    function circulatingSupply() public view virtual override returns (uint) {
        return totalSupply();
    }

    function token() public view virtual override returns (address) {
        return address(this);
    }

    /************************************************************************
    * internal functions
    ************************************************************************/
    function _debitFrom(address _from, uint16, bytes32, uint _amount) internal virtual override returns (uint) {
        address spender = _msgSender();
        if (_from != spender) _spendAllowance(_from, spender, _amount);
        _burn(_from, _amount);
        return _amount;
    }

    function _creditTo(uint16, address _toAddress, uint _amount) internal virtual override returns (uint) {
        _mint(_toAddress, _amount);
        return _amount;
    }

    function _transferFrom(address _from, address _to, uint _amount) internal virtual override returns (uint) {
        address spender = _msgSender();
        // if transfer from this contract, no need to check allowance
        if (_from != address(this) && _from != spender) _spendAllowance(_from, spender, _amount);
        _transfer(_from, _to, _amount);
        return _amount;
    }

    function _ld2sdRate() internal view virtual override returns (uint) {
        return ld2sdRate;
    }
}

// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */
pragma solidity >=0.8.0 <0.9.0;


library BytesLib {
    function concat(
        bytes memory _preBytes,
        bytes memory _postBytes
    )
    internal
    pure
    returns (bytes memory)
    {
        bytes memory tempBytes;

        assembly {
        // Get a location of some free memory and store it in tempBytes as
        // Solidity does for memory variables.
            tempBytes := mload(0x40)

        // Store the length of the first bytes array at the beginning of
        // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

        // Maintain a memory counter for the current write location in the
        // temp bytes array by adding the 32 bytes for the array length to
        // the starting location.
            let mc := add(tempBytes, 0x20)
        // Stop copying when the memory counter reaches the length of the
        // first bytes array.
            let end := add(mc, length)

            for {
            // Initialize a copy counter to the start of the _preBytes data,
            // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
            // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
            // Write the _preBytes data into the tempBytes memory 32 bytes
            // at a time.
                mstore(mc, mload(cc))
            }

        // Add the length of _postBytes to the current length of tempBytes
        // and store it as the new length in the first 32 bytes of the
        // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

        // Move the memory counter back from a multiple of 0x20 to the
        // actual end of the _preBytes data.
            mc := end
        // Stop copying when the memory counter reaches the new combined
        // length of the arrays.
            end := add(mc, length)

            for {
                let cc := add(_postBytes, 0x20)
            } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                mstore(mc, mload(cc))
            }

        // Update the free-memory pointer by padding our last write location
        // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
        // next 32 byte block, then round down to the nearest multiple of
        // 32. If the sum of the length of the two arrays is zero then add
        // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(0x40, and(
            add(add(end, iszero(add(length, mload(_preBytes)))), 31),
            not(31) // Round down to the nearest 32 bytes.
            ))
        }

        return tempBytes;
    }

    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {
        assembly {
        // Read the first 32 bytes of _preBytes storage, which is the length
        // of the array. (We don't need to use the offset into the slot
        // because arrays use the entire slot.)
            let fslot := sload(_preBytes.slot)
        // Arrays of 31 bytes or less have an even value in their slot,
        // while longer arrays have an odd value. The actual length is
        // the slot divided by two for odd values, and the lowest order
        // byte divided by two for even values.
        // If the slot is even, bitwise and the slot with 255 and divide by
        // two to get the length. If the slot is odd, bitwise and the slot
        // with -1 and divide by two.
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            let newlength := add(slength, mlength)
        // slength can contain both the length and contents of the array
        // if length < 32 bytes so let's prepare for that
        // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
            switch add(lt(slength, 32), lt(newlength, 32))
            case 2 {
            // Since the new array still fits in the slot, we just need to
            // update the contents of the slot.
            // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
                sstore(
                _preBytes.slot,
                // all the modifications to the slot are inside this
                // next block
                add(
                // we can just add to the slot contents because the
                // bytes we want to change are the LSBs
                fslot,
                add(
                mul(
                div(
                // load the bytes from memory
                mload(add(_postBytes, 0x20)),
                // zero all bytes to the right
                exp(0x100, sub(32, mlength))
                ),
                // and now shift left the number of bytes to
                // leave space for the length in the slot
                exp(0x100, sub(32, newlength))
                ),
                // increase length by the double of the memory
                // bytes length
                mul(mlength, 2)
                )
                )
                )
            }
            case 1 {
            // The stored value fits in the slot, but the combined value
            // will exceed it.
            // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

            // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

            // The contents of the _postBytes array start 32 bytes into
            // the structure. Our first read should obtain the `submod`
            // bytes that can fit into the unused space in the last word
            // of the stored array. To get this, we read 32 bytes starting
            // from `submod`, so the data we read overlaps with the array
            // contents by `submod` bytes. Masking the lowest-order
            // `submod` bytes allows us to add that value directly to the
            // stored value.

                let submod := sub(32, slength)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(
                sc,
                add(
                and(
                fslot,
                0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00
                ),
                and(mload(mc), mask)
                )
                )

                for {
                    mc := add(mc, 0x20)
                    sc := add(sc, 1)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
            default {
            // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
            // Start copying to the last used word of the stored array.
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

            // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

            // Copy over the first `submod` bytes of the new data as in
            // case 1 above.
                let slengthmod := mod(slength, 32)
                let mlengthmod := mod(mlength, 32)
                let submod := sub(32, slengthmod)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(sc, add(sload(sc), and(mload(mc), mask)))

                for {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
        }
    }

    function slice(
        bytes memory _bytes,
        uint256 _start,
        uint256 _length
    )
    internal
    pure
    returns (bytes memory)
    {
        require(_length + 31 >= _length, "slice_overflow");
        require(_bytes.length >= _start + _length, "slice_outOfBounds");

        bytes memory tempBytes;

        assembly {
            switch iszero(_length)
            case 0 {
            // Get a location of some free memory and store it in tempBytes as
            // Solidity does for memory variables.
                tempBytes := mload(0x40)

            // The first word of the slice result is potentially a partial
            // word read from the original array. To read it, we calculate
            // the length of that partial word and start copying that many
            // bytes into the array. The first word we copy will start with
            // data we don't care about, but the last `lengthmod` bytes will
            // land at the beginning of the contents of the new array. When
            // we're done copying, we overwrite the full first word with
            // the actual length of the slice.
                let lengthmod := and(_length, 31)

            // The multiplication in the next line is necessary
            // because when slicing multiples of 32 bytes (lengthmod == 0)
            // the following copy loop was copying the origin's length
            // and then ending prematurely not copying everything it should.
                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
                let end := add(mc, _length)

                for {
                // The multiplication in the next line has the same exact purpose
                // as the one above.
                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
                } lt(mc, end) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    mstore(mc, mload(cc))
                }

                mstore(tempBytes, _length)

            //update free-memory pointer
            //allocating the array padded to 32 bytes like the compiler does now
                mstore(0x40, and(add(mc, 31), not(31)))
            }
            //if we want a zero-length slice let's just return a zero-length array
            default {
                tempBytes := mload(0x40)
            //zero out the 32 bytes slice we are about to return
            //we need to do it because Solidity does not garbage collect
                mstore(tempBytes, 0)

                mstore(0x40, add(tempBytes, 0x20))
            }
        }

        return tempBytes;
    }

    function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
        require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
        address tempAddress;

        assembly {
            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
        }

        return tempAddress;
    }

    function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) {
        require(_bytes.length >= _start + 1 , "toUint8_outOfBounds");
        uint8 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }

        return tempUint;
    }

    function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) {
        require(_bytes.length >= _start + 2, "toUint16_outOfBounds");
        uint16 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }

        return tempUint;
    }

    function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) {
        require(_bytes.length >= _start + 4, "toUint32_outOfBounds");
        uint32 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }

        return tempUint;
    }

    function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) {
        require(_bytes.length >= _start + 8, "toUint64_outOfBounds");
        uint64 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }

        return tempUint;
    }

    function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) {
        require(_bytes.length >= _start + 12, "toUint96_outOfBounds");
        uint96 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }

        return tempUint;
    }

    function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) {
        require(_bytes.length >= _start + 16, "toUint128_outOfBounds");
        uint128 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }

        return tempUint;
    }

    function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
        require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
        uint256 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }

        return tempUint;
    }

    function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) {
        require(_bytes.length >= _start + 32, "toBytes32_outOfBounds");
        bytes32 tempBytes32;

        assembly {
            tempBytes32 := mload(add(add(_bytes, 0x20), _start))
        }

        return tempBytes32;
    }

    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {
        bool success = true;

        assembly {
            let length := mload(_preBytes)

        // if lengths don't match the arrays are not equal
            switch eq(length, mload(_postBytes))
            case 1 {
            // cb is a circuit breaker in the for loop since there's
            //  no said feature for inline assembly loops
            // cb = 1 - don't breaker
            // cb = 0 - break
                let cb := 1

                let mc := add(_preBytes, 0x20)
                let end := add(mc, length)

                for {
                    let cc := add(_postBytes, 0x20)
                // the next line is the loop condition:
                // while(uint256(mc < end) + cb == 2)
                } eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                    // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
            // unsuccess:
                success := 0
            }
        }

        return success;
    }

    function equalStorage(
        bytes storage _preBytes,
        bytes memory _postBytes
    )
    internal
    view
    returns (bool)
    {
        bool success = true;

        assembly {
        // we know _preBytes_offset is 0
            let fslot := sload(_preBytes.slot)
        // Decode the length of the stored array like in concatStorage().
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)

        // if lengths don't match the arrays are not equal
            switch eq(slength, mlength)
            case 1 {
            // slength can contain both the length and contents of the array
            // if length < 32 bytes so let's prepare for that
            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
                if iszero(iszero(slength)) {
                    switch lt(slength, 32)
                    case 1 {
                    // blank the last byte which is the length
                        fslot := mul(div(fslot, 0x100), 0x100)

                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
                        // unsuccess:
                            success := 0
                        }
                    }
                    default {
                    // cb is a circuit breaker in the for loop since there's
                    //  no said feature for inline assembly loops
                    // cb = 1 - don't breaker
                    // cb = 0 - break
                        let cb := 1

                    // get the keccak hash to get the contents of the array
                        mstore(0x0, _preBytes.slot)
                        let sc := keccak256(0x0, 0x20)

                        let mc := add(_postBytes, 0x20)
                        let end := add(mc, mlength)

                    // the next line is the loop condition:
                    // while(uint256(mc < end) + cb == 2)
                        for {} eq(add(lt(mc, end), cb), 2) {
                            sc := add(sc, 1)
                            mc := add(mc, 0x20)
                        } {
                            if iszero(eq(sload(sc), mload(mc))) {
                            // unsuccess:
                                success := 0
                                cb := 0
                            }
                        }
                    }
                }
            }
            default {
            // unsuccess:
                success := 0
            }
        }

        return success;
    }
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.7.6;

library ExcessivelySafeCall {
    uint256 constant LOW_28_MASK =
    0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

    /// @notice Use when you _really_ really _really_ don't trust the called
    /// contract. This prevents the called contract from causing reversion of
    /// the caller in as many ways as we can.
    /// @dev The main difference between this and a solidity low-level call is
    /// that we limit the number of bytes that the callee can cause to be
    /// copied to caller memory. This prevents stupid things like malicious
    /// contracts returning 10,000,000 bytes causing a local OOG when copying
    /// to memory.
    /// @param _target The address to call
    /// @param _gas The amount of gas to forward to the remote contract
    /// @param _maxCopy The maximum number of bytes of returndata to copy
    /// to memory.
    /// @param _calldata The data to send to the remote contract
    /// @return success and returndata, as `.call()`. Returndata is capped to
    /// `_maxCopy` bytes.
    function excessivelySafeCall(
        address _target,
        uint256 _gas,
        uint16 _maxCopy,
        bytes memory _calldata
    ) internal returns (bool, bytes memory) {
        // set up for assembly call
        uint256 _toCopy;
        bool _success;
        bytes memory _returnData = new bytes(_maxCopy);
        // dispatch message to recipient
        // by assembly calling "handle" function
        // we call via assembly to avoid memcopying a very large returndata
        // returned by a malicious contract
        assembly {
            _success := call(
            _gas, // gas
            _target, // recipient
            0, // ether value
            add(_calldata, 0x20), // inloc
            mload(_calldata), // inlen
            0, // outloc
            0 // outlen
            )
        // limit our copy to 256 bytes
            _toCopy := returndatasize()
            if gt(_toCopy, _maxCopy) {
                _toCopy := _maxCopy
            }
        // Store the length of the copied bytes
            mstore(_returnData, _toCopy)
        // copy the bytes from returndata[0:_toCopy]
            returndatacopy(add(_returnData, 0x20), 0, _toCopy)
        }
        return (_success, _returnData);
    }

    /// @notice Use when you _really_ really _really_ don't trust the called
    /// contract. This prevents the called contract from causing reversion of
    /// the caller in as many ways as we can.
    /// @dev The main difference between this and a solidity low-level call is
    /// that we limit the number of bytes that the callee can cause to be
    /// copied to caller memory. This prevents stupid things like malicious
    /// contracts returning 10,000,000 bytes causing a local OOG when copying
    /// to memory.
    /// @param _target The address to call
    /// @param _gas The amount of gas to forward to the remote contract
    /// @param _maxCopy The maximum number of bytes of returndata to copy
    /// to memory.
    /// @param _calldata The data to send to the remote contract
    /// @return success and returndata, as `.call()`. Returndata is capped to
    /// `_maxCopy` bytes.
    function excessivelySafeStaticCall(
        address _target,
        uint256 _gas,
        uint16 _maxCopy,
        bytes memory _calldata
    ) internal view returns (bool, bytes memory) {
        // set up for assembly call
        uint256 _toCopy;
        bool _success;
        bytes memory _returnData = new bytes(_maxCopy);
        // dispatch message to recipient
        // by assembly calling "handle" function
        // we call via assembly to avoid memcopying a very large returndata
        // returned by a malicious contract
        assembly {
            _success := staticcall(
            _gas, // gas
            _target, // recipient
            add(_calldata, 0x20), // inloc
            mload(_calldata), // inlen
            0, // outloc
            0 // outlen
            )
        // limit our copy to 256 bytes
            _toCopy := returndatasize()
            if gt(_toCopy, _maxCopy) {
                _toCopy := _maxCopy
            }
        // Store the length of the copied bytes
            mstore(_returnData, _toCopy)
        // copy the bytes from returndata[0:_toCopy]
            returndatacopy(add(_returnData, 0x20), 0, _toCopy)
        }
        return (_success, _returnData);
    }

    /**
     * @notice Swaps function selectors in encoded contract calls
     * @dev Allows reuse of encoded calldata for functions with identical
     * argument types but different names. It simply swaps out the first 4 bytes
     * for the new selector. This function modifies memory in place, and should
     * only be used with caution.
     * @param _newSelector The new 4-byte selector
     * @param _buf The encoded contract args
     */
    function swapSelector(bytes4 _newSelector, bytes memory _buf)
    internal
    pure
    {
        require(_buf.length >= 4);
        uint256 _mask = LOW_28_MASK;
        assembly {
        // load the first word of
            let _word := mload(add(_buf, 0x20))
        // mask out the top 4 bytes
        // /x
            _word := and(_word, _mask)
            _word := or(_newSelector, _word)
            mstore(add(_buf, 0x20), _word)
        }
    }
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _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);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.2;

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

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

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

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

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

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

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

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

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _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;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// 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 AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [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 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);
            }
        }
    }
}

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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// 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 (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

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

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// 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 v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

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

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (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 (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);
            }
        }
    }
}

// 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 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity =0.8.19;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

interface IARBRewarder {

    function harvestARB(address _stakingToken, address _user) external;

    function ARB() external view returns(IERC20 ARB);

    function massUpdatePools() external;
    
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

interface IBaseRewardPool {
    function stakingDecimals() external view returns (uint256);

    function totalStaked() external view returns (uint256);

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

    function rewardPerToken(address token) external view returns (uint256);

    function rewardTokenInfos()
        external
        view
        returns
        (
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols
        );

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

    function allEarned(address account)
        external
        view
        returns (uint256[] memory pendingBonusRewards);

    function queueNewRewards(uint256 _rewards, address token)
        external
        returns (bool);

    function getReward(address _account, address _receiver) external returns (bool);

    function getRewards(address _account, address _receiver, address[] memory _rewardTokens) external;

    function updateFor(address account) external;

    function updateRewardQueuer(address _rewardManager, bool _allowed) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface IBribeRewardDistributor {
    struct Claimable {
        address token;
        uint256 amount;
    }

    struct Claim {
        address token;
        address account;
        uint256 amount;
        bytes32[] merkleProof;
    }

    function getClaimable(Claim[] calldata _claims) external view returns(Claimable[] memory);

    function claim(Claim[] calldata _claims) external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

interface ILocker {

    struct UserUnlocking {
        uint256 startTime;
        uint256 endTime;
        uint256 amountInCoolDown; // total amount comitted to the unlock slot, never changes except when reseting slot
    }    

    function getUserUnlockingSchedule(address _user) external view returns (UserUnlocking[] memory slots);
    function getUserAmountInCoolDown(address _user) external view returns (uint256);
    function totalLocked() external view returns (uint256);
    function getFullyUnlock(address _user) external view returns(uint256 unlockedAmount);
    function getRewardablePercentWAD(address _user) external view returns(uint256 percent);
    function totalAmountInCoolDown() external view returns (uint256);
    function getUserNthUnlockSlot(address _user, uint256 n) external view returns (
        uint256 startTime,
        uint256 endTime,
        uint256 amountInCoolDown
    );

    function getUserUnlockSlotLength(address _user) external view returns (uint256);
    function getNextAvailableUnlockSlot(address _user) external view returns (uint256);
    function getUserTotalLocked(address _user) external view returns (uint256);
    function lock(uint256 _amount) external;
    function lockFor(uint256 _amount, address _for) external;
    function startUnlock(uint256 _amountToCoolDown) external;
    function cancelUnlock(uint256 _slotIndex) external;
    function unlock(uint256 slotIndex) external;    
}

// SPDX-License-Identifier: MIT

pragma solidity =0.8.19;
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

import "./IBribeRewardDistributor.sol";

interface IMasterPenpie {
    function poolLength() external view returns (uint256);

    function setPoolManagerStatus(address _address, bool _bool) external;

    function add(uint256 _allocPoint, address _stakingTokenToken, address _receiptToken, address _rewarder) external;

    function set(address _stakingToken, uint256 _allocPoint, address _helper,
        address _rewarder, bool _helperNeedsHarvest) external;

    function createRewarder(address _stakingTokenToken, address mainRewardToken) external
        returns (address);

    // View function to see pending GMPs on frontend.
    function getPoolInfo(address token) external view
        returns (
            uint256 emission,
            uint256 allocpoint,
            uint256 sizeOfPool,
            uint256 totalPoint
        );

    function pendingTokens(address _stakingToken, address _user, address token) external view
        returns (
            uint256 _pendingGMP,
            address _bonusTokenAddress,
            string memory _bonusTokenSymbol,
            uint256 _pendingBonusToken
        );
    
    function allPendingTokensWithBribe(
        address _stakingToken,
        address _user,
        IBribeRewardDistributor.Claim[] calldata _proof
    )
        external
        view
        returns (
            uint256 pendingPenpie,
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols,
            uint256[] memory pendingBonusRewards
        );

    function allPendingTokens(address _stakingToken, address _user) external view
        returns (
            uint256 pendingPenpie,
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols,
            uint256[] memory pendingBonusRewards
        );

    function massUpdatePools() external;

    function updatePool(address _stakingToken) external;

    function deposit(address _stakingToken, uint256 _amount) external;

    function depositFor(address _stakingToken, address _for, uint256 _amount) external;

    function withdraw(address _stakingToken, uint256 _amount) external;

    function beforeReceiptTokenTransfer(address _from, address _to, uint256 _amount) external;

    function afterReceiptTokenTransfer(address _from, address _to, uint256 _amount) external;

    function depositVlPenpieFor(uint256 _amount, address sender) external;

    function withdrawVlPenpieFor(uint256 _amount, address sender) external;

    function depositMPendleSVFor(uint256 _amount, address sender) external;

    function withdrawMPendleSVFor(uint256 _amount, address sender) external;    

    function multiclaimFor(address[] calldata _stakingTokens, address[][] calldata _rewardTokens, address user_address) external;

    function multiclaimOnBehalf(address[] memory _stakingTokens, address[][] calldata _rewardTokens, address user_address, bool _isClaimPNP) external;

    function multiclaim(address[] calldata _stakingTokens) external;

    function emergencyWithdraw(address _stakingToken, address sender) external;

    function updateEmissionRate(uint256 _gmpPerSec) external;

    function stakingInfo(address _stakingToken, address _user)
        external
        view
        returns (uint256 depositAmount, uint256 availableAmount);
    
    function totalTokenStaked(address _stakingToken) external view returns (uint256);

    function getRewarder(address _stakingToken) external view returns (address rewarder);

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity =0.8.19;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IMintableERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

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

    function decimals() external view returns (uint8);

    /**
     * @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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    function mint(address, uint256) external;
    function faucet(uint256) external;

    function burn(address, uint256) external;

    /**
     * @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
    );
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import { IERC20, ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./ILocker.sol";

interface IVLPenpie is ILocker {
    
    function penpie() external view returns(IERC20);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import "./IBaseRewardPool.sol";
import "./IBribeRewardDistributor.sol";

interface IVLPenpieBaseRewarder is IBaseRewardPool {
    function rewardTokenInfosWithBribe(IBribeRewardDistributor.Claim[] calldata _proof) external view
        returns (
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols
        );
    
    function rewardTokenInfos() external view
        returns (
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols
        );
    
    function allEarnedWithBribe(address _account, IBribeRewardDistributor.Claim[] calldata _proof) external view
        returns (uint256[] memory pendingBonusRewards);
    
    function allEarned(address _account) external view
        returns (uint256[] memory pendingBonusRewards);

    function getRewardWithBribe(
        address _account,
        address _receiver,
        IBribeRewardDistributor.Claim[] calldata _proof
    ) external returns (bool);
    
    function getReward(
        address _account,
        address _receiver
    ) external returns (bool);

    function getRewardsWithBribe(
        address _account,
        address _receiver,
        address[] memory _rewardTokens,
        IBribeRewardDistributor.Claim[] calldata _proof
    ) external;
    
    function queuePenpie(uint256 _amount, address _user, address _receiver) external returns(bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { MintableERC20 } from "./MintableERC20.sol";
import { PenpieReceiptToken } from "../rewards/PenpieReceiptToken.sol";
import { BaseRewardPoolV2 } from "../rewards/BaseRewardPoolV2.sol";

library ERC20FactoryLib {
    function createERC20(string memory name_, string memory symbol_) public returns(address) 
    {
        ERC20 token = new MintableERC20(name_, symbol_);
        return address(token);
    }

    function createReceipt(address _stakeToken, address _masterPenpie, string memory _name, string memory _symbol) public returns(address)
    {
        ERC20 token = new PenpieReceiptToken(_stakeToken, _masterPenpie, _name, _symbol);
        return address(token);
    }

    function createRewarder(
        address _receiptToken,
        address mainRewardToken,
        address _masterRadpie,
        address _rewardQueuer
    ) external returns (address) {
        BaseRewardPoolV2 _rewarder = new BaseRewardPoolV2(
            _receiptToken,
            mainRewardToken,
            _masterRadpie,
            _rewardQueuer
        );
        return address(_rewarder);
    }    
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;

import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

contract MintableERC20 is ERC20, Ownable {
    /*
    The ERC20 deployed will be owned by the others contracts of the protocol, specifically by
    MasterMagpie and WombatStaking, forbidding the misuse of these functions for nefarious purposes
    */
    constructor(string memory name_, string memory symbol_) ERC20(name_, symbol_) {} 

    function mint(address account, uint256 amount) external virtual onlyOwner {
        _mint(account, amount);
    }

    function burn(address account, uint256 amount) external virtual onlyOwner {
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import "@layerzerolabs/solidity-examples/contracts/token/oft/v2/OFTV2.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract PenpieOFT is OFTV2, Pausable {

	/* ============ State Variables ============ */

	/* ============ Constructor ============ */

    constructor(
		address _endpoint,
		uint256 _mintAmt
	) OFTV2("Penpie Token", "PNP", 8, _endpoint) {
		if (_mintAmt > 0) {
			_mint(msg.sender, _mintAmt);
		}
	}

	/* ============ External Functions ============ */	

	/* ============ Internal Functions ============ */

	function _debitFrom(
		address _from,
		uint16 _dstChainId,
		bytes32 _toAddress,
		uint _amount
	) internal override whenNotPaused returns (uint) {
		return super._debitFrom(_from, _dstChainId, _toAddress, _amount);
	}

	function _creditTo(uint16 _srcChainId, address _toAddress, uint _amount) internal override whenNotPaused returns (uint) {
		return super._creditTo(_srcChainId, _toAddress, _amount);
	}

	/* ============ Admin Functions ============ */

	function pause() public onlyOwner {
		_pause();
	}

	function unpause() public onlyOwner {
		_unpause();
	}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import  { IMasterPenpie } from "../interfaces/IMasterPenpie.sol";

import "../interfaces/IBaseRewardPool.sol";

/// @title A contract for managing rewards for a pool
/// @author Magpie Team
/// @notice You can use this contract for getting informations about rewards for a specific pools
contract BaseRewardPoolV2 is Ownable, IBaseRewardPool {
    using SafeERC20 for IERC20Metadata;
    using SafeERC20 for IERC20;

    /* ============ State Variables ============ */

    address public immutable receiptToken;
    address public immutable operator;          // master Penpie
    uint256 public immutable receiptTokenDecimals;

    address[] public rewardTokens;

    struct Reward {
        address rewardToken;
        uint256 rewardPerTokenStored;
        uint256 queuedRewards;
    }

    struct UserInfo {
        uint256 userRewardPerTokenPaid;
        uint256 userRewards;
    }

    mapping(address => Reward) public rewards;                           // [rewardToken]
    // amount by [rewardToken][account], 
    mapping(address => mapping(address => UserInfo)) public userInfos;
    mapping(address => bool) public isRewardToken;
    mapping(address => bool) public rewardQueuers;

    /* ============ Events ============ */

    event RewardAdded(uint256 _reward, address indexed _token);
    event Staked(address indexed _user, uint256 _amount);
    event Withdrawn(address indexed _user, uint256 _amount);
    event RewardPaid(address indexed _user, address indexed _receiver, uint256 _reward, address indexed _token);
    event RewardQueuerUpdated(address indexed _manager, bool _allowed);

    /* ============ Errors ============ */

    error OnlyRewardQueuer();
    error OnlyMasterPenpie();
    error NotAllowZeroAddress();
    error MustBeRewardToken();

    /* ============ Constructor ============ */

    constructor(
        address _receiptToken,
        address _rewardToken,
        address _masterPenpie,
        address _rewardQueuer
    ) {
        if(
            _receiptToken == address(0) ||
            _masterPenpie  == address(0) ||
            _rewardQueuer  == address(0)
        ) revert NotAllowZeroAddress();

        receiptToken = _receiptToken;
        receiptTokenDecimals = IERC20Metadata(receiptToken).decimals();
        operator = _masterPenpie;

        if (_rewardToken != address(0)) {
            rewards[_rewardToken] = Reward({
                rewardToken: _rewardToken,
                rewardPerTokenStored: 0,
                queuedRewards: 0
            });
            rewardTokens.push(_rewardToken);
        }

        isRewardToken[_rewardToken] = true;
        rewardQueuers[_rewardQueuer] = true;
    }

    /* ============ Modifiers ============ */

    modifier onlyRewardQueuer() {
        if (!rewardQueuers[msg.sender])
            revert OnlyRewardQueuer();
        _;
    }

    modifier onlyMasterPenpie() {
        if (msg.sender != operator)
            revert OnlyMasterPenpie();
        _;
    }

    modifier updateReward(address _account) {
        _updateFor(_account);
        _;
    }

    modifier updateRewards(address _account, address[] memory _rewards) {
        uint256 length = _rewards.length;
        uint256 userShare = balanceOf(_account);
        
        for (uint256 index = 0; index < length; ++index) {
            address rewardToken = _rewards[index];
            UserInfo storage userInfo = userInfos[rewardToken][_account];
            // if a reward stopped queuing, no need to recalculate to save gas fee
            if (userInfo.userRewardPerTokenPaid == rewardPerToken(rewardToken))
                continue;
            userInfo.userRewards = _earned(_account, rewardToken, userShare);
            userInfo.userRewardPerTokenPaid = rewardPerToken(rewardToken);
        }
        _;
    }    

    /* ============ External Getters ============ */

    /// @notice Returns current amount of staked tokens
    /// @return Returns current amount of staked tokens
    function totalStaked() public override virtual view returns (uint256) {
        return IERC20(receiptToken).totalSupply();
    }

    /// @notice Returns amount of staked tokens in master Penpie by account
    /// @param _account Address account
    /// @return Returns amount of staked tokens by account
    function balanceOf(address _account) public override virtual view returns (uint256) {
        return IERC20(receiptToken).balanceOf(_account);
    }

    function stakingDecimals() external override virtual view returns (uint256) {
        return receiptTokenDecimals;
    }

    /// @notice Returns amount of reward token per staking tokens in pool
    /// @param _rewardToken Address reward token
    /// @return Returns amount of reward token per staking tokens in pool
    function rewardPerToken(address _rewardToken)
        public
        override
        view
        returns (uint256)
    {
        return rewards[_rewardToken].rewardPerTokenStored;
    }

    function rewardTokenInfos()
        override
        external
        view
        returns
        (
            address[] memory bonusTokenAddresses,
            string[] memory bonusTokenSymbols
        )
    {
        uint256 rewardTokensLength = rewardTokens.length;
        bonusTokenAddresses = new address[](rewardTokensLength);
        bonusTokenSymbols = new string[](rewardTokensLength);
        for (uint256 i; i < rewardTokensLength; i++) {
            bonusTokenAddresses[i] = rewardTokens[i];
            bonusTokenSymbols[i] = IERC20Metadata(address(bonusTokenAddresses[i])).symbol();
        }
    }

    /// @notice Returns amount of reward token earned by a user
    /// @param _account Address account
    /// @param _rewardToken Address reward token
    /// @return Returns amount of reward token earned by a user
    function earned(address _account, address _rewardToken)
        public
        override
        view
        returns (uint256)
    {
        return _earned(_account, _rewardToken, balanceOf(_account));
    }

    /// @notice Returns amount of all reward tokens
    /// @param _account Address account
    /// @return pendingBonusRewards as amounts of all rewards.
    function allEarned(address _account)
        external
        override
        view
        returns (
            uint256[] memory pendingBonusRewards
        )
    {
        uint256 length = rewardTokens.length;
        pendingBonusRewards = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            pendingBonusRewards[i] = earned(_account, rewardTokens[i]);
        }

        return pendingBonusRewards;
    }

    function getRewardLength() external view returns(uint256) {
        return rewardTokens.length;
    }    

    /* ============ External Functions ============ */

    /// @notice Updates the reward information for one account
    /// @param _account Address account
    function updateFor(address _account) override external {
        _updateFor(_account);
    }

    function getReward(address _account, address _receiver)
        public
        onlyMasterPenpie
        updateReward(_account)
        returns (bool)
    {
        uint256 length = rewardTokens.length;

        for (uint256 index = 0; index < length; ++index) {
                address rewardToken = rewardTokens[index];
                _sendReward(rewardToken, _account, _receiver);
            }
        return true;
    }

    function getRewards(address _account, address _receiver, address[] memory _rewardTokens) override
        external
        onlyMasterPenpie
        updateRewards(_account, _rewardTokens)
    {
       uint256 length = _rewardTokens.length;
        
        for (uint256 index = 0; index < length; ++index) {
            address rewardToken = _rewardTokens[index];
            _sendReward(rewardToken, _account, _receiver);
        }
    }

    /// @notice Sends new rewards to be distributed to the users staking. Only possible to donate already registered token
    /// @param _amountReward Amount of reward token to be distributed
    /// @param _rewardToken Address reward token
    function donateRewards(uint256 _amountReward, address _rewardToken) external {
        if (!isRewardToken[_rewardToken])
            revert MustBeRewardToken();

        _provisionReward(_amountReward, _rewardToken);
    }

    /* ============ Admin Functions ============ */

    function updateRewardQueuer(address _rewardManager, bool _allowed) external onlyOwner {
        rewardQueuers[_rewardManager] = _allowed;

        emit RewardQueuerUpdated(_rewardManager, rewardQueuers[_rewardManager]);
    }

    /// @notice Sends new rewards to be distributed to the users staking. Only callable by manager
    /// @param _amountReward Amount of reward token to be distributed
    /// @param _rewardToken Address reward token
    function queueNewRewards(uint256 _amountReward, address _rewardToken)
        override
        external
        onlyRewardQueuer
        returns (bool)
    {
        if (!isRewardToken[_rewardToken]) {
            rewardTokens.push(_rewardToken);
            isRewardToken[_rewardToken] = true;
        }

        _provisionReward(_amountReward, _rewardToken);
        return true;
    }

    /* ============ Internal Functions ============ */

    function _provisionReward(uint256 _amountReward, address _rewardToken) internal {
        IERC20(_rewardToken).safeTransferFrom(
            msg.sender,
            address(this),
            _amountReward
        );
        Reward storage rewardInfo = rewards[_rewardToken];

        uint256 totalStake = totalStaked();
        if (totalStake == 0) {
            rewardInfo.queuedRewards += _amountReward;
        } else {
            if (rewardInfo.queuedRewards > 0) {
                _amountReward += rewardInfo.queuedRewards;
                rewardInfo.queuedRewards = 0;
            }
            rewardInfo.rewardPerTokenStored =
                rewardInfo.rewardPerTokenStored +
                (_amountReward * 10**receiptTokenDecimals) /
                totalStake;
        }
        emit RewardAdded(_amountReward, _rewardToken);
    }

    function _earned(address _account, address _rewardToken, uint256 _userShare) internal view returns (uint256) {
        UserInfo storage userInfo = userInfos[_rewardToken][_account];
        return ((_userShare *
                (rewardPerToken(_rewardToken) -
                    userInfo.userRewardPerTokenPaid)) /
                10**receiptTokenDecimals) + userInfo.userRewards;
    }

    function _sendReward(address _rewardToken, address _account, address _receiver) internal {
        uint256 _amount = userInfos[_rewardToken][_account].userRewards;
        if (_amount != 0) {
            userInfos[_rewardToken][_account].userRewards = 0;
            IERC20(_rewardToken).safeTransfer(_receiver, _amount);
            emit RewardPaid(_account, _receiver, _amount, _rewardToken);
        }
    }

    function _updateFor(address _account) internal {
        uint256 length = rewardTokens.length;
        for (uint256 index = 0; index < length; ++index) {
            address rewardToken = rewardTokens[index];
            UserInfo storage userInfo = userInfos[rewardToken][_account];
            // if a reward stopped queuing, no need to recalculate to save gas fee
            if (userInfo.userRewardPerTokenPaid == rewardPerToken(rewardToken))
                continue;

            userInfo.userRewards = earned(_account, rewardToken);
            userInfo.userRewardPerTokenPaid = rewardPerToken(rewardToken);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)
pragma solidity ^0.8.19;

import { ERC20, IERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { IMasterPenpie } from "../interfaces/IMasterPenpie.sol";

/// @title PenpieReceiptToken is to represent a Pendle Market deposited to penpie posistion. PenpieReceiptToken is minted to user who deposited Market token
///        on pendle staking to increase defi lego
///         
///         Reward from Magpie and on BaseReward should be updated upon every transfer.
///
/// @author Magpie Team
/// @notice Mater penpie emit `PNP` reward token based on Time. For a pool, 

contract PenpieReceiptToken is ERC20, Ownable {
    using SafeERC20 for IERC20Metadata;
    using SafeERC20 for IERC20;

    address public underlying;
    address public immutable masterPenpie;


    /* ============ Errors ============ */

    /* ============ Events ============ */

    constructor(address _underlying, address _masterPenpie, string memory name, string memory symbol) ERC20(name, symbol) {
        underlying = _underlying;
        masterPenpie = _masterPenpie;
    } 

    // should only be called by 1. pendleStaking for Pendle Market deposits 2. masterPenpie for other general staking token such as mPendleOFT or PNP-ETH Lp tokens
    function mint(address account, uint256 amount) external virtual onlyOwner {
        _mint(account, amount);
    }

    // should only be called by 1. pendleStaking for Pendle Market deposits 2. masterPenpie for other general staking token such as mPendleOFT or PNP-ETH Lp tokens
    function burn(address account, uint256 amount) external virtual onlyOwner {
        _burn(account, amount);
    }

    // rewards are calculated based on user's receipt token balance, so reward should be updated on master penpie before transfer
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        IMasterPenpie(masterPenpie).beforeReceiptTokenTransfer(from, to, amount);
    }

    // rewards are calculated based on user's receipt token balance, so balance should be updated on master penpie before transfer
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        IMasterPenpie(masterPenpie).afterReceiptTokenTransfer(from, to, amount);
    }

}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {
    "contracts/libraries/ERC20FactoryLib.sol": {
      "ERC20FactoryLib": "0xae8e4bc88f792297a808cb5f32d4950fbbd8aeba"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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