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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./util/PausableUpgradeable.sol";
import "./util/SafeERC20Upgradeable.sol";
import "./proxy/ClonesUpgradeable.sol";
import "./token/TimelockRewardDistributionTokenImpl.sol";
import "./interface/INFTXVaultFactory.sol";
import "./interface/INFTXVault.sol";
import "./interface/IRewardDistributionToken.sol";
import "./StakingTokenProvider.sol";

// Author: 0xKiwi.

// Pausing codes for LP staking are:
// 10: Deposit

contract NFTXLPStaking is PausableUpgradeable {
    using SafeERC20Upgradeable for IERC20Upgradeable;

    INFTXVaultFactory public nftxVaultFactory;
    IRewardDistributionToken public rewardDistTokenImpl;
    StakingTokenProvider public stakingTokenProvider;

    event PoolCreated(uint256 vaultId, address pool);
    event PoolUpdated(uint256 vaultId, address pool);
    event FeesReceived(uint256 vaultId, uint256 amount);

    event Deposit(uint256 vaultId, address stakingToken, uint256 amount, address account, uint256 timelockLength);
    event Withdraw(uint256 vaultId, address stakingToken, uint256 amount, address account);

    struct StakingPool {
        address stakingToken;
        address rewardToken;
    }
    mapping(uint256 => StakingPool) public vaultStakingInfo;

    TimelockRewardDistributionTokenImpl public newTimelockRewardDistTokenImpl;

    function __NFTXLPStaking__init(address _stakingTokenProvider)
        external
        initializer
    {
        __Ownable_init();
        require(_stakingTokenProvider != address(0), "Provider != address(0)");
        require(
            address(newTimelockRewardDistTokenImpl) == address(0),
            "Already assigned"
        );
        stakingTokenProvider = StakingTokenProvider(_stakingTokenProvider);
        newTimelockRewardDistTokenImpl = new TimelockRewardDistributionTokenImpl();
        newTimelockRewardDistTokenImpl.__TimelockRewardDistributionToken_init(
            IERC20Upgradeable(address(0)),
            "",
            ""
        );
    }

    modifier onlyAdmin() {
        require(
            msg.sender == owner() ||
                msg.sender == nftxVaultFactory.feeDistributor(),
            "LPStaking: Not authorized"
        );
        _;
    }

    function setNFTXVaultFactory(address newFactory) external onlyOwner {
        require(
            address(nftxVaultFactory) == address(0),
            "nftxVaultFactory is immutable"
        );
        nftxVaultFactory = INFTXVaultFactory(newFactory);
    }

    function setStakingTokenProvider(address newProvider) external onlyOwner {
        require(newProvider != address(0));
        stakingTokenProvider = StakingTokenProvider(newProvider);
    }

    function addPoolForVault(uint256 vaultId) external onlyAdmin {
        require(
            address(nftxVaultFactory) != address(0),
            "LPStaking: Factory not set"
        );
        require(
            vaultStakingInfo[vaultId].stakingToken == address(0),
            "LPStaking: Pool already exists"
        );
        address _rewardToken = nftxVaultFactory.vault(vaultId);
        address _stakingToken = stakingTokenProvider.stakingTokenForVaultToken(
            _rewardToken
        );
        StakingPool memory pool = StakingPool(_stakingToken, _rewardToken);
        vaultStakingInfo[vaultId] = pool;
        address newRewardDistToken = _deployDividendToken(pool);
        emit PoolCreated(vaultId, newRewardDistToken);
    }

    function updatePoolForVaults(uint256[] calldata vaultIds) external {
        uint256 length = vaultIds.length;
        for (uint256 i; i < length; ++i) {
            updatePoolForVault(vaultIds[i]);
        }
    }

    // In case the provider changes, this lets the pool be updated. Anyone can call it.
    function updatePoolForVault(uint256 vaultId) public {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        // Not letting people use this function to create new pools.
        require(
            pool.stakingToken != address(0),
            "LPStaking: Pool doesn't exist"
        );
        address _stakingToken = stakingTokenProvider.stakingTokenForVaultToken(
            pool.rewardToken
        );
        StakingPool memory newPool = StakingPool(
            _stakingToken,
            pool.rewardToken
        );
        vaultStakingInfo[vaultId] = newPool;

        // If the pool is already deployed, ignore the update.
        address addr = address(_rewardDistributionTokenAddr(newPool));
        if (isContract(addr)) {
            return;
        }
        address newRewardDistToken = _deployDividendToken(newPool);
        emit PoolUpdated(vaultId, newRewardDistToken);
    }

    function receiveRewards(uint256 vaultId, uint256 amount)
        external
        onlyAdmin
        returns (bool)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        if (pool.stakingToken == address(0)) {
            // In case the pair is updated, but not yet
            return false;
        }

        TimelockRewardDistributionTokenImpl rewardDistToken = _rewardDistributionTokenAddr(
                pool
            );
        // Don't distribute rewards unless there are people to distribute to.
        // Also added here if the distribution token is not deployed, just forfeit rewards for now.
        if (
            !isContract(address(rewardDistToken)) ||
            rewardDistToken.totalSupply() == 0
        ) {
            return false;
        }
        // We "pull" to the dividend tokens so the vault only needs to approve this contract.
        IERC20Upgradeable(pool.rewardToken).safeTransferFrom(
            msg.sender,
            address(rewardDistToken),
            amount
        );
        rewardDistToken.distributeRewards(amount);
        emit FeesReceived(vaultId, amount);
        return true;
    }

    function deposit(uint256 vaultId, uint256 amount) external {
        onlyOwnerIfPaused(10);
        // Check the pool in case its been updated.
        updatePoolForVault(vaultId);

        StakingPool memory pool = vaultStakingInfo[vaultId];
        require(pool.stakingToken != address(0), "LPStaking: Nonexistent pool");
        IERC20Upgradeable(pool.stakingToken).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        );
        TimelockRewardDistributionTokenImpl xSLPToken = _rewardDistributionTokenAddr(
                pool
            );

        // If the user has an existing timelock, check if it is in the future.
        uint256 currentTimelock = xSLPToken.timelockUntil(msg.sender);
        if (currentTimelock > block.timestamp) {
            // Maintain the same timelock if they already have one.
            // We do this instead of patching in the token because
            // the xSLP contracts as currently deployed are not upgradeable.
            uint256 timestamp = currentTimelock - block.timestamp;
            xSLPToken.timelockMint(
                msg.sender,
                amount,
                timestamp
            );
            emit Deposit(vaultId, pool.stakingToken, amount, msg.sender, timestamp);
        } else {
            // Timelock for 2 seconds if they don't already have a timelock to prevent flash loans.
            xSLPToken.timelockMint(msg.sender, amount, 2);
            emit Deposit(vaultId, pool.stakingToken, amount, msg.sender, 2);
        }
    }

    function timelockDepositFor(
        uint256 vaultId,
        address account,
        uint256 amount,
        uint256 timelockLength
    ) external {
        require(timelockLength < 2592000, "Timelock too long");
        require(nftxVaultFactory.excludedFromFees(msg.sender), "Not zap");
        onlyOwnerIfPaused(10);
        // Check the pool in case its been updated.
        updatePoolForVault(vaultId);
        StakingPool memory pool = vaultStakingInfo[vaultId];
        require(pool.stakingToken != address(0), "LPStaking: Nonexistent pool");
        IERC20Upgradeable(pool.stakingToken).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        );
        _rewardDistributionTokenAddr(pool).timelockMint(
            account,
            amount,
            timelockLength
        );
        emit Deposit(vaultId, pool.stakingToken, amount, account, timelockLength);
    }

    function exit(uint256 vaultId) external {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        _claimRewards(pool, msg.sender);
        _withdraw(vaultId, pool, balanceOf(vaultId, msg.sender), msg.sender);
    }

    function emergencyExitAndClaim(address _stakingToken, address _rewardToken)
        external
    {
        StakingPool memory pool = StakingPool(_stakingToken, _rewardToken);
        TimelockRewardDistributionTokenImpl dist = _rewardDistributionTokenAddr(
            pool
        );
        require(isContract(address(dist)), "Not a pool");
        _claimRewards(pool, msg.sender);
        _withdraw(INFTXVault(_rewardToken).vaultId(), pool, dist.balanceOf(msg.sender), msg.sender);
    }

    function emergencyExit(address _stakingToken, address _rewardToken)
        external
    {
        StakingPool memory pool = StakingPool(_stakingToken, _rewardToken);
        TimelockRewardDistributionTokenImpl dist = _rewardDistributionTokenAddr(
            pool
        );
        require(isContract(address(dist)), "Not a pool");
        _withdraw(INFTXVault(_rewardToken).vaultId(), pool, dist.balanceOf(msg.sender), msg.sender);
    }

    function emergencyMigrate(uint256 vaultId) external {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        IRewardDistributionToken unusedDist = _unusedRewardDistributionTokenAddr(
                pool
            );
        IRewardDistributionToken oldDist = _oldRewardDistributionTokenAddr(
            pool
        );

        uint256 unusedDistBal;
        if (isContract(address(unusedDist))) {
            unusedDistBal = unusedDist.balanceOf(msg.sender);
            if (unusedDistBal > 0) {
                unusedDist.burnFrom(msg.sender, unusedDistBal);
            }
        }
        uint256 oldDistBal;
        if (isContract(address(oldDist))) {
            oldDistBal = oldDist.balanceOf(msg.sender);
            if (oldDistBal > 0) {
                oldDist.withdrawReward(msg.sender);
                oldDist.burnFrom(msg.sender, oldDistBal);
            }
        }

        TimelockRewardDistributionTokenImpl newDist = _rewardDistributionTokenAddr(
                pool
            );
        if (!isContract(address(newDist))) {
            address deployedDist = _deployDividendToken(pool);
            require(
                deployedDist == address(newDist),
                "Not deploying proper distro"
            );
            emit PoolUpdated(vaultId, deployedDist);
        }
        require(unusedDistBal + oldDistBal > 0, "Nothing to migrate");
        newDist.mint(msg.sender, unusedDistBal + oldDistBal);
    }

    function withdraw(uint256 vaultId, uint256 amount) external {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        _claimRewards(pool, msg.sender);
        _withdraw(vaultId, pool, amount, msg.sender);
    }

    function claimRewards(uint256 vaultId) public {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        _claimRewards(pool, msg.sender);
    }

    function claimMultipleRewards(uint256[] calldata vaultIds) external {
        uint256 length = vaultIds.length;
        for (uint256 i; i < length; ++i) {
            claimRewards(vaultIds[i]);
        }
    }

    function newRewardDistributionToken(uint256 vaultId)
        external
        view
        returns (TimelockRewardDistributionTokenImpl)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        if (pool.stakingToken == address(0)) {
            return TimelockRewardDistributionTokenImpl(address(0));
        }
        return _rewardDistributionTokenAddr(pool);
    }

    function rewardDistributionToken(uint256 vaultId)
        external
        view
        returns (IRewardDistributionToken)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        if (pool.stakingToken == address(0)) {
            return IRewardDistributionToken(address(0));
        }
        return _unusedRewardDistributionTokenAddr(pool);
    }

    function oldRewardDistributionToken(uint256 vaultId)
        external
        view
        returns (address)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        if (pool.stakingToken == address(0)) {
            return address(0);
        }
        return address(_oldRewardDistributionTokenAddr(pool));
    }

    function unusedRewardDistributionToken(uint256 vaultId)
        external
        view
        returns (address)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        if (pool.stakingToken == address(0)) {
            return address(0);
        }
        return address(_unusedRewardDistributionTokenAddr(pool));
    }

    function rewardDistributionTokenAddr(
        address stakedToken,
        address rewardToken
    ) public view returns (address) {
        StakingPool memory pool = StakingPool(stakedToken, rewardToken);
        return address(_rewardDistributionTokenAddr(pool));
    }

    function balanceOf(uint256 vaultId, address addr)
        public
        view
        returns (uint256)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        TimelockRewardDistributionTokenImpl dist = _rewardDistributionTokenAddr(
            pool
        );
        require(isContract(address(dist)), "Not a pool");
        return dist.balanceOf(addr);
    }

    function oldBalanceOf(uint256 vaultId, address addr)
        public
        view
        returns (uint256)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        IRewardDistributionToken dist = _oldRewardDistributionTokenAddr(pool);
        require(isContract(address(dist)), "Not a pool");
        return dist.balanceOf(addr);
    }

    function unusedBalanceOf(uint256 vaultId, address addr)
        public
        view
        returns (uint256)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        IRewardDistributionToken dist = _unusedRewardDistributionTokenAddr(
            pool
        );
        require(isContract(address(dist)), "Not a pool");
        return dist.balanceOf(addr);
    }

    function lockedUntil(uint256 vaultId, address who)
        external
        view
        returns (uint256)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        TimelockRewardDistributionTokenImpl dist = _rewardDistributionTokenAddr(
            pool
        );
        return dist.timelockUntil(who);
    }

    function lockedLPBalance(uint256 vaultId, address who)
        external
        view
        returns (uint256)
    {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        TimelockRewardDistributionTokenImpl dist = _rewardDistributionTokenAddr(
            pool
        );
        if (block.timestamp > dist.timelockUntil(who)) {
            return 0;
        }
        return dist.balanceOf(who);
    }

    function _claimRewards(StakingPool memory pool, address account) internal {
        require(pool.stakingToken != address(0), "LPStaking: Nonexistent pool");
        _rewardDistributionTokenAddr(pool).withdrawReward(account);
    }

    function _withdraw(
        uint256 vaultId,
        StakingPool memory pool,
        uint256 amount,
        address account
    ) internal {
        require(pool.stakingToken != address(0), "LPStaking: Nonexistent pool");
        _rewardDistributionTokenAddr(pool).burnFrom(account, amount);
        IERC20Upgradeable(pool.stakingToken).safeTransfer(account, amount);
        emit Withdraw(vaultId, pool.stakingToken, amount, account);
    }

    function _deployDividendToken(StakingPool memory pool)
        internal
        returns (address)
    {
        // Changed to use new nonces.
        bytes32 salt = keccak256(
            abi.encodePacked(pool.stakingToken, pool.rewardToken, uint256(2))
        );
        address rewardDistToken = ClonesUpgradeable.cloneDeterministic(
            address(newTimelockRewardDistTokenImpl),
            salt
        );
        string memory name = stakingTokenProvider.nameForStakingToken(
            pool.rewardToken
        );
        TimelockRewardDistributionTokenImpl(rewardDistToken)
            .__TimelockRewardDistributionToken_init(
                IERC20Upgradeable(pool.rewardToken),
                name,
                name
            );
        return rewardDistToken;
    }

    // Note: this function does not guarantee the token is deployed, we leave that check to elsewhere to save gas.
    function _rewardDistributionTokenAddr(StakingPool memory pool)
        public
        view
        returns (TimelockRewardDistributionTokenImpl)
    {
        bytes32 salt = keccak256(
            abi.encodePacked(
                pool.stakingToken,
                pool.rewardToken,
                uint256(2) /* small nonce to change tokens */
            )
        );
        address tokenAddr = ClonesUpgradeable.predictDeterministicAddress(
            address(newTimelockRewardDistTokenImpl),
            salt
        );
        return TimelockRewardDistributionTokenImpl(tokenAddr);
    }

    // Note: this function does not guarantee the token is deployed, we leave that check to elsewhere to save gas.
    function _oldRewardDistributionTokenAddr(StakingPool memory pool)
        public
        view
        returns (IRewardDistributionToken)
    {
        bytes32 salt = keccak256(
            abi.encodePacked(pool.stakingToken, pool.rewardToken, uint256(1))
        );
        address tokenAddr = ClonesUpgradeable.predictDeterministicAddress(
            address(rewardDistTokenImpl),
            salt
        );
        return IRewardDistributionToken(tokenAddr);
    }

    // Note: this function does not guarantee the token is deployed, we leave that check to elsewhere to save gas.
    function _unusedRewardDistributionTokenAddr(StakingPool memory pool)
        public
        view
        returns (IRewardDistributionToken)
    {
        bytes32 salt = keccak256(
            abi.encodePacked(pool.stakingToken, pool.rewardToken)
        );
        address tokenAddr = ClonesUpgradeable.predictDeterministicAddress(
            address(rewardDistTokenImpl),
            salt
        );
        return IRewardDistributionToken(tokenAddr);
    }

    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function retrieveTokens(
        uint256 vaultId,
        uint256 amount,
        address from,
        address to
    ) public onlyOwner {
        StakingPool memory pool = vaultStakingInfo[vaultId];
        TimelockRewardDistributionTokenImpl xSlp = _rewardDistributionTokenAddr(
            pool
        );
        xSlp.burnFrom(from, amount);
        xSlp.mint(to, amount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./util/OwnableUpgradeable.sol";
import "./token/IERC20Metadata.sol";

// Author: 0xKiwi.

contract StakingTokenProvider is OwnableUpgradeable {
    address public uniLikeExchange;
    address public defaultPairedToken;
    string public defaultPrefix;
    mapping(address => address) public pairedToken;
    mapping(address => string) public pairedPrefix;

    event NewDefaultPaired(address oldPaired, address newPaired);
    event NewPairedTokenForVault(
        address vaultToken,
        address oldPairedtoken,
        address newPairedToken
    );

    // This is an address provder to allow us to abstract out what liquidity
    // our vault tokens should be paired with.
    function __StakingTokenProvider_init(
        address _uniLikeExchange,
        address _defaultPairedtoken,
        string memory _defaultPrefix
    ) public initializer {
        __Ownable_init();
        require(_uniLikeExchange != address(0), "Cannot be address(0)");
        require(_defaultPairedtoken != address(0), "Cannot be address(0)");
        uniLikeExchange = _uniLikeExchange;
        defaultPairedToken = _defaultPairedtoken;
        defaultPrefix = _defaultPrefix;
    }

    function setPairedTokenForVaultToken(
        address _vaultToken,
        address _newPairedToken,
        string calldata _newPrefix
    ) external onlyOwner {
        require(_newPairedToken != address(0), "Cannot be address(0)");
        emit NewPairedTokenForVault(
            _vaultToken,
            pairedToken[_vaultToken],
            _newPairedToken
        );
        pairedToken[_vaultToken] = _newPairedToken;
        pairedPrefix[_vaultToken] = _newPrefix;
    }

    function setDefaultPairedToken(
        address _newDefaultPaired,
        string calldata _newDefaultPrefix
    ) external onlyOwner {
        emit NewDefaultPaired(defaultPairedToken, _newDefaultPaired);
        defaultPairedToken = _newDefaultPaired;
        defaultPrefix = _newDefaultPrefix;
    }

    function stakingTokenForVaultToken(address _vaultToken)
        external
        view
        returns (address)
    {
        address _pairedToken = pairedToken[_vaultToken];
        if (_pairedToken == address(0)) {
            _pairedToken = defaultPairedToken;
        }
        return pairFor(uniLikeExchange, _vaultToken, _pairedToken);
    }

    function nameForStakingToken(address _vaultToken)
        external
        view
        returns (string memory)
    {
        string memory _pairedPrefix = pairedPrefix[_vaultToken];
        if (bytes(_pairedPrefix).length == 0) {
            _pairedPrefix = defaultPrefix;
        }
        address _pairedToken = pairedToken[_vaultToken];
        if (_pairedToken == address(0)) {
            _pairedToken = defaultPairedToken;
        }

        string memory symbol1 = IERC20Metadata(_vaultToken).symbol();
        string memory symbol2 = IERC20Metadata(_pairedToken).symbol();
        return string(abi.encodePacked(_pairedPrefix, symbol1, symbol2));
    }

    function pairForVaultToken(address _vaultToken, address _pairedToken)
        external
        view
        returns (address)
    {
        return pairFor(uniLikeExchange, _vaultToken, _pairedToken);
    }

    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB)
        internal
        pure
        returns (address token0, address token1)
    {
        require(tokenA != tokenB, "UniswapV2Library: IDENTICAL_ADDRESSES");
        (token0, token1) = tokenA < tokenB
            ? (tokenA, tokenB)
            : (tokenB, tokenA);
        require(token0 != address(0), "UniswapV2Library: ZERO_ADDRESS");
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(
        address factory,
        address tokenA,
        address tokenB
    ) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(
            uint160(
                uint256(
                    keccak256(
                        abi.encodePacked(
                            hex"ff",
                            factory,
                            keccak256(abi.encodePacked(token0, token1)),
                            hex"e18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303" // init code hash
                        )
                    )
                )
            )
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface INFTXEligibility {
    // Read functions.
    function name() external pure returns (string memory);

    function finalized() external view returns (bool);

    function targetAsset() external pure returns (address);

    function checkAllEligible(uint256[] calldata tokenIds)
        external
        view
        returns (bool);

    function checkEligible(uint256[] calldata tokenIds)
        external
        view
        returns (bool[] memory);

    function checkAllIneligible(uint256[] calldata tokenIds)
        external
        view
        returns (bool);

    function checkIsEligible(uint256 tokenId) external view returns (bool);

    // Write functions.
    function __NFTXEligibility_init_bytes(bytes calldata configData) external;

    function beforeMintHook(uint256[] calldata tokenIds) external;

    function afterMintHook(uint256[] calldata tokenIds) external;

    function beforeRedeemHook(uint256[] calldata tokenIds) external;

    function afterRedeemHook(uint256[] calldata tokenIds) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../token/IERC20Upgradeable.sol";
import "./INFTXVaultFactory.sol";
import "./INFTXEligibility.sol";

interface INFTXVault is IERC20Upgradeable {
    function manager() external view returns (address);

    function assetAddress() external view returns (address);

    function vaultFactory() external view returns (INFTXVaultFactory);

    function eligibilityStorage() external view returns (INFTXEligibility);

    function is1155() external view returns (bool);

    function allowAllItems() external view returns (bool);

    function enableMint() external view returns (bool);

    function enableRandomRedeem() external view returns (bool);

    function enableTargetRedeem() external view returns (bool);

    function enableRandomSwap() external view returns (bool);

    function enableTargetSwap() external view returns (bool);

    function vaultId() external view returns (uint256);

    function nftIdAt(uint256 holdingsIndex) external view returns (uint256);

    function allHoldings() external view returns (uint256[] memory);

    function totalHoldings() external view returns (uint256);

    function mintFee() external view returns (uint256);

    function randomRedeemFee() external view returns (uint256);

    function targetRedeemFee() external view returns (uint256);

    function randomSwapFee() external view returns (uint256);

    function targetSwapFee() external view returns (uint256);

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

    event VaultInit(
        uint256 indexed vaultId,
        address assetAddress,
        bool is1155,
        bool allowAllItems
    );

    event ManagerSet(address manager);
    event EligibilityDeployed(uint256 moduleIndex, address eligibilityAddr);
    // event CustomEligibilityDeployed(address eligibilityAddr);

    event EnableMintUpdated(bool enabled);
    event EnableRandomRedeemUpdated(bool enabled);
    event EnableTargetRedeemUpdated(bool enabled);
    event EnableRandomSwapUpdated(bool enabled);
    event EnableTargetSwapUpdated(bool enabled);

    event Minted(uint256[] nftIds, uint256[] amounts, address to);
    event Redeemed(uint256[] nftIds, uint256[] specificIds, address to);
    event Swapped(
        uint256[] nftIds,
        uint256[] amounts,
        uint256[] specificIds,
        uint256[] redeemedIds,
        address to
    );

    function __NFTXVault_init(
        string calldata _name,
        string calldata _symbol,
        address _assetAddress,
        bool _is1155,
        bool _allowAllItems
    ) external;

    function finalizeVault() external;

    function setVaultMetadata(string memory name_, string memory symbol_)
        external;

    function setVaultFeatures(
        bool _enableMint,
        bool _enableRandomRedeem,
        bool _enableTargetRedeem,
        bool _enableRandomSwap,
        bool _enableTargetSwap
    ) external;

    function setFees(
        uint256 _mintFee,
        uint256 _randomRedeemFee,
        uint256 _targetRedeemFee,
        uint256 _randomSwapFee,
        uint256 _targetSwapFee
    ) external;

    function disableVaultFees() external;

    // This function allows for an easy setup of any eligibility module contract from the EligibilityManager.
    // It takes in ABI encoded parameters for the desired module. This is to make sure they can all follow
    // a similar interface.
    function deployEligibilityStorage(
        uint256 moduleIndex,
        bytes calldata initData
    ) external returns (address);

    // The manager has control over options like fees and features
    function setManager(address _manager) external;

    function mint(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts /* ignored for ERC721 vaults */
    ) external returns (uint256);

    function mintTo(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts, /* ignored for ERC721 vaults */
        address to
    ) external returns (uint256);

    function redeem(uint256 amount, uint256[] calldata specificIds)
        external
        returns (uint256[] calldata);

    function redeemTo(
        uint256 amount,
        uint256[] calldata specificIds,
        address to
    ) external returns (uint256[] calldata);

    function swap(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts, /* ignored for ERC721 vaults */
        uint256[] calldata specificIds
    ) external returns (uint256[] calldata);

    function swapTo(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts, /* ignored for ERC721 vaults */
        uint256[] calldata specificIds,
        address to
    ) external returns (uint256[] calldata);

    function allValidNFTs(uint256[] calldata tokenIds)
        external
        view
        returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../proxy/IBeacon.sol";

interface INFTXVaultFactory is IBeacon {
    // Read functions.
    function numVaults() external view returns (uint256);

    function zapContract() external view returns (address);

    function zapContracts(address addr) external view returns (bool);

    function feeDistributor() external view returns (address);

    function eligibilityManager() external view returns (address);

    function vault(uint256 vaultId) external view returns (address);

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

    function vaultsForAsset(address asset)
        external
        view
        returns (address[] memory);

    function isLocked(uint256 id) external view returns (bool);

    function excludedFromFees(address addr) external view returns (bool);

    function factoryMintFee() external view returns (uint64);

    function factoryRandomRedeemFee() external view returns (uint64);

    function factoryTargetRedeemFee() external view returns (uint64);

    function factoryRandomSwapFee() external view returns (uint64);

    function factoryTargetSwapFee() external view returns (uint64);

    function vaultFees(uint256 vaultId)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        );

    event NewFeeDistributor(address oldDistributor, address newDistributor);
    event NewZapContract(address oldZap, address newZap);
    event UpdatedZapContract(address zap, bool excluded);
    event FeeExclusion(address feeExcluded, bool excluded);
    event NewEligibilityManager(address oldEligManager, address newEligManager);
    event NewVault(
        uint256 indexed vaultId,
        address vaultAddress,
        address assetAddress
    );
    event UpdateVaultFees(
        uint256 vaultId,
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    );
    event DisableVaultFees(uint256 vaultId);
    event UpdateFactoryFees(
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    );

    // Write functions.
    function __NFTXVaultFactory_init(
        address _vaultImpl,
        address _feeDistributor
    ) external;

    function createVault(
        string calldata name,
        string calldata symbol,
        address _assetAddress,
        bool is1155,
        bool allowAllItems
    ) external returns (uint256);

    function setFeeDistributor(address _feeDistributor) external;

    function setEligibilityManager(address _eligibilityManager) external;

    function setZapContract(address _zapContract, bool _excluded) external;

    function setFeeExclusion(address _excludedAddr, bool excluded) external;

    function setFactoryFees(
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    ) external;

    function setVaultFees(
        uint256 vaultId,
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    ) external;

    function disableVaultFees(uint256 vaultId) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../token/IERC20Upgradeable.sol";

interface IRewardDistributionToken is IERC20Upgradeable {
    function distributeRewards(uint256 amount) external;

    function __RewardDistributionToken_init(
        IERC20Upgradeable _target,
        string memory _name,
        string memory _symbol
    ) external;

    function mint(
        address account,
        address to,
        uint256 amount
    ) external;

    function burnFrom(address account, uint256 amount) external;

    function withdrawReward(address user) external;

    function dividendOf(address _owner) external view returns (uint256);

    function withdrawnRewardOf(address _owner) external view returns (uint256);

    function accumulativeRewardOf(address _owner)
        external
        view
        returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library ClonesUpgradeable {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(
                ptr,
                0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
            )
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(
                add(ptr, 0x28),
                0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
            )
            instance := create(0, ptr, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt)
        internal
        returns (address instance)
    {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(
                ptr,
                0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
            )
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(
                add(ptr, 0x28),
                0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
            )
            instance := create2(0, ptr, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(
                ptr,
                0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
            )
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(
                add(ptr, 0x28),
                0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000
            )
            mstore(add(ptr, 0x38), shl(0x60, deployer))
            mstore(add(ptr, 0x4c), salt)
            mstore(add(ptr, 0x6c), keccak256(ptr, 0x37))
            predicted := keccak256(add(ptr, 0x37), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(address implementation, bytes32 salt)
        internal
        view
        returns (address predicted)
    {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function childImplementation() external view returns (address);

    function upgradeChildTo(address newImplementation) external;
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity ^0.8.0;

/**
 * @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 a proxied contract can't have 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.
 *
 * 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.
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(
            _initializing || !_initialized,
            "Initializable: contract is already initialized"
        );

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../proxy/Initializable.sol";
import "../util/ContextUpgradeable.sol";
import "./IERC20Upgradeable.sol";
import "./IERC20Metadata.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 guidelines: functions revert instead
 * of 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 ERC20Upgradeable is
    Initializable,
    ContextUpgradeable,
    IERC20Upgradeable,
    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.
     */
    function __ERC20_init(string memory name_, string memory symbol_)
        internal
        initializer
    {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_)
        internal
        initializer
    {
        _name = name_;
        _symbol = symbol_;
    }

    function _setMetadata(string memory name_, string memory symbol_) internal {
        _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:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(_msgSender(), 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(
            currentAllowance >= amount,
            "ERC20: transfer amount exceeds allowance"
        );
        _approve(sender, _msgSender(), currentAllowance - 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)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][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)
    {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, 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);
    }

    /**
     * @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");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(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 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 to 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 {}

    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20Upgradeable {
    /**
     * @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

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

    /**
     * @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);

    /**
     * @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 ^0.8.0;

import "../util/OwnableUpgradeable.sol";
import "../util/SafeMathUpgradeable.sol";
import "../util/SafeMathInt.sol";
import "../util/SafeERC20Upgradeable.sol";
import "./ERC20Upgradeable.sol";

/// @title Reward-Paying Token (renamed from Dividend)
/// @author Roger Wu (https://github.com/roger-wu)
/// @dev A mintable ERC20 token that allows anyone to pay and distribute a target token
///  to token holders as dividends and allows token holders to withdraw their dividends.
///  Reference: the source code of PoWH3D: https://etherscan.io/address/0xB3775fB83F7D12A36E0475aBdD1FCA35c091efBe#code
contract TimelockRewardDistributionTokenImpl is
    OwnableUpgradeable,
    ERC20Upgradeable
{
    using SafeMathUpgradeable for uint256;
    using SafeMathInt for int256;
    using SafeERC20Upgradeable for IERC20Upgradeable;

    IERC20Upgradeable public target;

    // With `magnitude`, we can properly distribute dividends even if the amount of received target is small.
    // For more discussion about choosing the value of `magnitude`,
    //  see https://github.com/ethereum/EIPs/issues/1726#issuecomment-472352728
    uint256 internal constant magnitude = 2**128;

    uint256 internal magnifiedRewardPerShare;

    // About dividendCorrection:
    // If the token balance of a `_user` is never changed, the dividend of `_user` can be computed with:
    //   `dividendOf(_user) = dividendPerShare * balanceOf(_user)`.
    // When `balanceOf(_user)` is changed (via minting/burning/transferring tokens),
    //   `dividendOf(_user)` should not be changed,
    //   but the computed value of `dividendPerShare * balanceOf(_user)` is changed.
    // To keep the `dividendOf(_user)` unchanged, we add a correction term:
    //   `dividendOf(_user) = dividendPerShare * balanceOf(_user) + dividendCorrectionOf(_user)`,
    //   where `dividendCorrectionOf(_user)` is updated whenever `balanceOf(_user)` is changed:
    //   `dividendCorrectionOf(_user) = dividendPerShare * (old balanceOf(_user)) - (new balanceOf(_user))`.
    // So now `dividendOf(_user)` returns the same value before and after `balanceOf(_user)` is changed.
    mapping(address => int256) internal magnifiedRewardCorrections;
    mapping(address => uint256) internal withdrawnRewards;

    mapping(address => uint256) internal timelock;

    event Timelocked(address user, uint256 amount, uint256 until);

    function __TimelockRewardDistributionToken_init(
        IERC20Upgradeable _target,
        string memory _name,
        string memory _symbol
    ) public initializer {
        __Ownable_init();
        __ERC20_init(_name, _symbol);
        target = _target;
    }

    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            allowance(sender, _msgSender()).sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

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

    function timelockMint(
        address account,
        uint256 amount,
        uint256 timelockLength
    ) public virtual onlyOwner {
        uint256 timelockFinish = block.timestamp + timelockLength;
        timelock[account] = timelockFinish;
        emit Timelocked(account, amount, timelockFinish);
        _mint(account, amount);
    }

    function timelockUntil(address account) public view returns (uint256) {
        return timelock[account];
    }

    /**
     * @dev Destroys `amount` tokens from `account`, without deducting from the caller's
     * allowance. Dangerous.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     */
    function burnFrom(address account, uint256 amount)
        public
        virtual
        onlyOwner
    {
        _burn(account, amount);
    }

    /// @notice Distributes target to token holders as dividends.
    /// @dev It reverts if the total supply of tokens is 0.
    /// It emits the `RewardsDistributed` event if the amount of received target is greater than 0.
    /// About undistributed target tokens:
    ///   In each distribution, there is a small amount of target not distributed,
    ///     the magnified amount of which is
    ///     `(amount * magnitude) % totalSupply()`.
    ///   With a well-chosen `magnitude`, the amount of undistributed target
    ///     (de-magnified) in a distribution can be less than 1 wei.
    ///   We can actually keep track of the undistributed target in a distribution
    ///     and try to distribute it in the next distribution,
    ///     but keeping track of such data on-chain costs much more than
    ///     the saved target, so we don't do that.
    function distributeRewards(uint256 amount) external virtual onlyOwner {
        require(totalSupply() > 0, "RewardDist: 0 supply");
        require(amount > 0, "RewardDist: 0 amount");

        // Because we receive the tokens from the staking contract, we assume the tokens have been received.
        magnifiedRewardPerShare = magnifiedRewardPerShare.add(
            (amount).mul(magnitude) / totalSupply()
        );

        emit RewardsDistributed(msg.sender, amount);
    }

    /// @notice Withdraws the target distributed to the sender.
    /// @dev It emits a `RewardWithdrawn` event if the amount of withdrawn target is greater than 0.
    function withdrawReward(address user) external onlyOwner {
        uint256 _withdrawableReward = withdrawableRewardOf(user);
        if (_withdrawableReward > 0) {
            withdrawnRewards[user] = withdrawnRewards[user].add(
                _withdrawableReward
            );
            target.safeTransfer(user, _withdrawableReward);
            emit RewardWithdrawn(user, _withdrawableReward);
        }
    }

    /// @notice View the amount of dividend in wei that an address can withdraw.
    /// @param _owner The address of a token holder.
    /// @return The amount of dividend in wei that `_owner` can withdraw.
    function dividendOf(address _owner) public view returns (uint256) {
        return withdrawableRewardOf(_owner);
    }

    /// @notice View the amount of dividend in wei that an address can withdraw.
    /// @param _owner The address of a token holder.
    /// @return The amount of dividend in wei that `_owner` can withdraw.
    function withdrawableRewardOf(address _owner)
        internal
        view
        returns (uint256)
    {
        return accumulativeRewardOf(_owner).sub(withdrawnRewards[_owner]);
    }

    /// @notice View the amount of dividend in wei that an address has withdrawn.
    /// @param _owner The address of a token holder.
    /// @return The amount of dividend in wei that `_owner` has withdrawn.
    function withdrawnRewardOf(address _owner) public view returns (uint256) {
        return withdrawnRewards[_owner];
    }

    /// @notice View the amount of dividend in wei that an address has earned in total.
    /// @dev accumulativeRewardOf(_owner) = withdrawableRewardOf(_owner) + withdrawnRewardOf(_owner)
    /// = (magnifiedRewardPerShare * balanceOf(_owner) + magnifiedRewardCorrections[_owner]) / magnitude
    /// @param _owner The address of a token holder.
    /// @return The amount of dividend in wei that `_owner` has earned in total.
    function accumulativeRewardOf(address _owner)
        public
        view
        returns (uint256)
    {
        return
            magnifiedRewardPerShare
                .mul(balanceOf(_owner))
                .toInt256()
                .add(magnifiedRewardCorrections[_owner])
                .toUint256Safe() / magnitude;
    }

    /// @dev Internal function that transfer tokens from one address to another.
    /// Update magnifiedRewardCorrections to keep dividends unchanged.
    /// @param from The address to transfer from.
    /// @param to The address to transfer to.
    /// @param value The amount to be transferred.
    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal override {
        require(block.timestamp > timelock[from], "User locked");
        super._transfer(from, to, value);

        int256 _magCorrection = magnifiedRewardPerShare.mul(value).toInt256();
        magnifiedRewardCorrections[from] = magnifiedRewardCorrections[from].add(
            _magCorrection
        );
        magnifiedRewardCorrections[to] = magnifiedRewardCorrections[to].sub(
            _magCorrection
        );
    }

    /// @dev Internal function that mints tokens to an account.
    /// Update magnifiedRewardCorrections to keep dividends unchanged.
    /// @param account The account that will receive the created tokens.
    /// @param value The amount that will be created.
    function _mint(address account, uint256 value) internal override {
        super._mint(account, value);

        magnifiedRewardCorrections[account] = magnifiedRewardCorrections[
            account
        ].sub((magnifiedRewardPerShare.mul(value)).toInt256());
    }

    /// @dev Internal function that burns an amount of the token of a given account.
    /// Update magnifiedRewardCorrections to keep dividends unchanged.
    /// @param account The account whose tokens will be burnt.
    /// @param value The amount that will be burnt.
    function _burn(address account, uint256 value) internal override {
        require(block.timestamp > timelock[account], "User locked");
        super._burn(account, value);

        magnifiedRewardCorrections[account] = magnifiedRewardCorrections[
            account
        ].add((magnifiedRewardPerShare.mul(value)).toInt256());
    }

    /// @dev This event MUST emit when target is distributed to token holders.
    /// @param from The address which sends target to this contract.
    /// @param weiAmount The amount of distributed target in wei.
    event RewardsDistributed(address indexed from, uint256 weiAmount);

    /// @dev This event MUST emit when an address withdraws their dividend.
    /// @param to The address which withdraws target from this contract.
    /// @param weiAmount The amount of withdrawn target in wei.
    event RewardWithdrawn(address indexed to, uint256 weiAmount);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 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"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../proxy/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 initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {}

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

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }

    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../proxy/Initializable.sol";
import "./ContextUpgradeable.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 initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./OwnableUpgradeable.sol";

contract PausableUpgradeable is OwnableUpgradeable {
    function __Pausable_init() internal initializer {
        __Ownable_init();
    }

    event SetPaused(uint256 lockId, bool paused);
    event SetIsGuardian(address addr, bool isGuardian);

    mapping(address => bool) public isGuardian;
    mapping(uint256 => bool) public isPaused;

    // 0 : createVault
    // 1 : mint
    // 2 : redeem
    // 3 : swap
    // 4 : flashloan

    function onlyOwnerIfPaused(uint256 lockId) public view virtual {
        require(!isPaused[lockId] || msg.sender == owner(), "Paused");
    }

    function unpause(uint256 lockId) public virtual onlyOwner {
        isPaused[lockId] = false;
        emit SetPaused(lockId, false);
    }

    function pause(uint256 lockId) public virtual {
        require(isGuardian[msg.sender], "Can't pause");
        isPaused[lockId] = true;
        emit SetPaused(lockId, true);
    }

    function setIsGuardian(address addr, bool _isGuardian)
        public
        virtual
        onlyOwner
    {
        isGuardian[addr] = _isGuardian;
        emit SetIsGuardian(addr, _isGuardian);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./Address.sol";
import "../token/IERC20Upgradeable.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 SafeERC20Upgradeable {
    using Address for address;

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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'
        // solhint-disable-next-line max-line-length
        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(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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
                )
            );
        }
    }

    /**
     * @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(IERC20Upgradeable 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
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title SafeMathInt
 * @dev Math operations with safety checks that revert on error
 * @dev SafeMath adapted for int256
 * Based on code of  https://github.com/RequestNetwork/requestNetwork/blob/master/packages/requestNetworkSmartContracts/contracts/base/math/SafeMathInt.sol
 */
library SafeMathInt {
    function mul(int256 a, int256 b) internal pure returns (int256) {
        // Prevent overflow when multiplying INT256_MIN with -1
        // https://github.com/RequestNetwork/requestNetwork/issues/43
        require(!(a == -2**255 && b == -1) && !(b == -2**255 && a == -1));

        int256 c = a * b;
        require((b == 0) || (c / b == a));
        return c;
    }

    function div(int256 a, int256 b) internal pure returns (int256) {
        // Prevent overflow when dividing INT256_MIN by -1
        // https://github.com/RequestNetwork/requestNetwork/issues/43
        require(!(a == -2**255 && b == -1) && (b > 0));

        return a / b;
    }

    function sub(int256 a, int256 b) internal pure returns (int256) {
        require((b >= 0 && a - b <= a) || (b < 0 && a - b > a));

        return a - b;
    }

    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a));
        return c;
    }

    function toUint256Safe(int256 a) internal pure returns (uint256) {
        require(a >= 0);
        return uint256(a);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        require(value < 2**255, "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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