Contract 0xc2218e377caff2cc005093124c31120aa5c902d1

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

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

import "./libraries/StringHelpers.sol";
import "./libraries/BorrowableHelpers.sol";
import "./interfaces/ISupplyVaultStrategy.sol";
import "./interfaces/ISupplyVault.sol";
import "./interfaces/IBorrowable.sol";

contract SupplyVault is ERC20, ISupplyVault, Ownable, Pausable, ReentrancyGuard {
    using Math for uint256;
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using BorrowableHelpers for IBorrowable;
    using StringHelpers for string;

    uint256 constant MAX_BPS = 10_000;
    uint256 constant MIN_FEE_BPS = 0;
    uint256 constant MAX_FEE_BPS = MAX_BPS / 2;

    IERC20 public immutable override underlying;
    IBorrowable[] public override borrowables;
    struct BorrowableInfo {
        bool enabled;
        bool exists;
    }
    mapping(IBorrowable => BorrowableInfo) borrowableInfo;

    uint public constant GRACE_PERIOD = 14 days;
    uint public constant MIN_DELAY = 2 days;
    uint public constant MAX_DELAY = 30 days;

    ISupplyVaultStrategy public override strategy;
    ISupplyVaultStrategy public override pendingStrategy;
    uint256 public override pendingStrategyNotBefore;

    address public override reallocateManager;

    address public override feeTo;
    uint256 public override feeBps = (MAX_BPS * 10) / 100;

    uint256 checkpointBalance;

    constructor(
        IERC20 _underlying,
        ISupplyVaultStrategy _strategy,
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    )
        public
        ERC20(
            _name.orElse(string("Tarot ").append(ERC20(address(_underlying)).symbol()).append(" Supply Vault")),
            _symbol.orElse(string("t").append(ERC20(address(_underlying)).symbol()))
        )
    {
        if (_decimals == 0) {
            _decimals = ERC20(address(_underlying)).decimals();
        }
        _setupDecimals(_decimals);
        underlying = _underlying;
        strategy = _strategy;

        _pause();
    }

    function _addBorrowable(address _address) private {
        // Strategy interprets argument and returns a borrowable
        IBorrowable borrowable = strategy.getBorrowable(_address);
        require(address(borrowable.underlying()) == address(underlying), "V:INVLD_UL");
        require(!borrowableInfo[borrowable].exists, "V:B_X");

        borrowableInfo[borrowable].exists = true;
        borrowableInfo[borrowable].enabled = true;
        borrowables.push(borrowable);

        emit AddBorrowable(address(borrowable));
    }

    function addBorrowable(address _address) external override onlyOwner nonReentrant {
        _addBorrowable(_address);
    }

    function addBorrowables(address[] calldata _addressList) external override onlyOwner nonReentrant {
        for (uint256 i = 0; i < _addressList.length; i++) {
            _addBorrowable(_addressList[i]);
        }
    }

    function indexOfBorrowable(IBorrowable borrowable) public view override returns (uint256) {
        uint256 numBorrowables = borrowables.length;
        for (uint256 i = 0; i < numBorrowables; i++) {
            if (borrowables[i] == borrowable) {
                return i;
            }
        }
        require(false, "V:B_NOT_FOUND");
    }

    function removeBorrowable(IBorrowable borrowable) external override onlyOwner nonReentrant {
        require(borrowables.length > 0, "V:NO_B");
        require(borrowableInfo[borrowable].exists, "V:NO_B");
        require(!borrowableInfo[borrowable].enabled, "V:B_E");
        require(borrowable.balanceOf(address(this)) == 0, "V:B_NOT_EMPTY");

        uint256 lastIndex = borrowables.length - 1;
        uint256 index = indexOfBorrowable(borrowable);

        borrowables[index] = borrowables[lastIndex];
        borrowables.pop();
        delete borrowableInfo[borrowable];

        emit RemoveBorrowable(address(borrowable));
    }

    function disableBorrowable(IBorrowable borrowable) external override onlyOwner nonReentrant {
        require(borrowableInfo[borrowable].exists, "V:B_X");
        require(borrowableInfo[borrowable].enabled, "V:B_DSBLD");

        borrowableInfo[borrowable].enabled = false;

        emit DisableBorrowable(address(borrowable));
    }

    function enableBorrowable(IBorrowable borrowable) external override onlyOwner nonReentrant {
        require(borrowableInfo[borrowable].exists, "V:B_X");
        require(!borrowableInfo[borrowable].enabled, "V:B_E");

        borrowableInfo[borrowable].enabled = true;

        emit EnableBorrowable(address(borrowable));
    }

    function unwindBorrowable(IBorrowable borrowable, uint256 borrowableAmount) external override onlyOwner {
        require(borrowableInfo[borrowable].exists, "V:B_X");
        require(!borrowableInfo[borrowable].enabled, "V:B_E");

        // Apply any outstanding fees and get the amount of underlying locked in the contract
        bool belowCheckpoint;
        {
            // NOTE: Checkpoint may be below total underlying
            uint256 totalUnderlying = _applyFee();
            belowCheckpoint = totalUnderlying < checkpointBalance;
        }

        if (borrowableAmount == 0) {
            // If value is zero then unwind the entire borrowable
            borrowableAmount = borrowable.balanceOf(address(this));
        }
        require(borrowableAmount > 0, "V:B_ZERO");

        uint256 borrowableAmountAsUnderlying = borrowable.underlyingValueOf(borrowableAmount);
        require(borrowableAmountAsUnderlying > 0, "V:U_ZERO");

        uint256 available = Math.min(borrowable.myUnderlyingBalance(), underlying.balanceOf(address(borrowable)));
        require(borrowableAmountAsUnderlying <= available, "V:NEED_B");

        uint256 underlyingBalanceBefore = underlying.balanceOf(address(this));
        IERC20(address(borrowable)).safeTransfer(address(borrowable), borrowableAmount);
        borrowable.redeem(address(this));
        uint256 underlyingAmount = underlying.balanceOf(address(this)).sub(underlyingBalanceBefore);

        if (belowCheckpoint) {
            // We were below the checkpoint prior to this unwinding so do not touch checkpoint
        } else {
            // Checkpoint matched beforehand so make sure it matches afterward
            _updateCheckpointBalance(_getTotalUnderlying());
        }

        emit UnwindBorrowable(address(borrowable), underlyingAmount, borrowableAmount);
    }

    function updatePendingStrategy(ISupplyVaultStrategy _newPendingStrategy, uint256 _notBefore)
        external
        override
        onlyOwner
        nonReentrant
    {
        if (address(_newPendingStrategy) == address(0)) {
            require(_notBefore == 0, "V:NOT_BEFORE");
        } else {
            require(address(_newPendingStrategy) != address(0), "V:INVLD_STRAT");
            require(_newPendingStrategy != strategy, "V:SAME_STRAT");
            require(_notBefore >= block.timestamp + MIN_DELAY, "V:TOO_SOON");
            require(_notBefore < block.timestamp + MAX_DELAY, "V:TOO_LATE");
        }
        pendingStrategy = _newPendingStrategy;
        pendingStrategyNotBefore = _notBefore;

        emit UpdatePendingStrategy(address(_newPendingStrategy), _notBefore);
    }

    function updateStrategy() external override onlyOwner nonReentrant {
        require(address(pendingStrategy) != address(0), "V:INVLD_STRAT");
        require(block.timestamp >= pendingStrategyNotBefore, "V:TOO_SOON");
        require(block.timestamp < pendingStrategyNotBefore + GRACE_PERIOD, "V:TOO_LATE");
        require(pendingStrategy != strategy, "V:SAME_STRAT");

        strategy = pendingStrategy;
        delete pendingStrategy;
        delete pendingStrategyNotBefore;

        emit UpdateStrategy(address(strategy));
    }

    function updateFeeBps(uint256 _newFeeBps) external override onlyOwner nonReentrant {
        require(_newFeeBps >= MIN_FEE_BPS && _newFeeBps <= MAX_FEE_BPS, "V:INVLD_FEE");

        _applyFee();
        feeBps = _newFeeBps;

        emit UpdateFeeBps(_newFeeBps);
    }

    function updateFeeTo(address _newFeeTo) external override onlyOwner nonReentrant {
        require(_newFeeTo != feeTo, "V:SAME_FEE_TO");

        _applyFee();
        feeTo = _newFeeTo;

        emit UpdateFeeTo(_newFeeTo);
    }

    function updateReallocateManager(address _newReallocateManager) external override onlyOwner nonReentrant {
        require(_newReallocateManager != reallocateManager, "V:REALLOC_MGR");

        reallocateManager = _newReallocateManager;

        emit UpdateReallocateManager(_newReallocateManager);
    }

    function pause() external override onlyOwner nonReentrant {
        _pause();
    }

    function unpause() external override onlyOwner nonReentrant {
        _unpause();
    }

    function getBorrowablesLength() external view override returns (uint256) {
        return borrowables.length;
    }

    function getBorrowableEnabled(IBorrowable borrowable) external view override returns (bool) {
        return borrowableInfo[borrowable].enabled;
    }

    function getBorrowableExists(IBorrowable borrowable) external view override returns (bool) {
        return borrowableInfo[borrowable].exists;
    }

    function getTotalUnderlying() external override nonReentrant returns (uint256 totalUnderlying) {
        totalUnderlying = _applyFee();
    }

    function _getTotalUnderlying() private returns (uint256 totalUnderlying) {
        totalUnderlying = underlying.balanceOf(address(this));

        uint256 numBorrowables = borrowables.length;
        for (uint256 i = 0; i < numBorrowables; i++) {
            IBorrowable borrowable = borrowables[i];
            totalUnderlying = totalUnderlying.add(borrowable.myUnderlyingBalance());
        }
    }

    function enter(uint256 _amount) external override whenNotPaused nonReentrant returns (uint256 share) {
        share = _enterWithToken(address(underlying), _amount);
    }

    function enterWithToken(address _tokenAddress, uint256 _tokenAmount)
        public
        override
        whenNotPaused
        nonReentrant
        returns (uint256 share)
    {
        share = _enterWithToken(_tokenAddress, _tokenAmount);
    }

    // Deposit underlying and mint supply vault tokens
    function _enterWithToken(address _tokenAddress, uint256 _tokenAmount) private returns (uint256 share) {
        require(_tokenAmount > 0, "V:TKN_ZERO");

        uint256 underlyingAmount;
        if (_tokenAddress == address(underlying)) {
            underlyingAmount = _tokenAmount;
        } else if (borrowableInfo[IBorrowable(_tokenAddress)].enabled) {
            // _tokenAddress is a valid Borrowable
            // _amount is in Borrowable
            underlyingAmount = IBorrowable(_tokenAddress).underlyingValueOf(_tokenAmount);
        } else {
            require(false, "V:INVLD_TKN");
        }
        require(underlyingAmount > 0, "V:U_ZERO");

        // Apply any outstanding fees and get the amount of underlying locked in the contract
        uint256 totalUnderlying = _applyFee();

        // After applying fees we must be exactly at checkpoint to continue
        require(totalUnderlying == checkpointBalance, "V:DEP_PAUSE");

        uint256 totalShares = totalSupply();

        if (totalShares == 0) {
            if (totalUnderlying == 0) {
                // If no shares exists, mint it 1:1 to the amount put in
                share = underlyingAmount;
            } else {
                // No shares but we have a non-zero balance of underlying so mint 1:1 including existing balance
                share = underlyingAmount.add(totalUnderlying);
            }
        } else {
            // Shares are non-zero but we have a zero balance of underlying
            // Cannot happen because checkpoint balance would have been above zero
            require(totalUnderlying > 0, "V:TU_ZERO");

            // Calculate and mint the amount of shares the underlying is worth.
            // The ratio will change overtime, as shares are burned/minted and underlying deposited + gained from fees / withdrawn.
            share = underlyingAmount.mul(totalShares).div(totalUnderlying);
        }
        mint(msg.sender, share);

        // Lock the underlying in the contract (does not support taxed tokens)
        IERC20(_tokenAddress).safeTransferFrom(msg.sender, address(this), _tokenAmount);

        // Directly update the checkpoint balance to the new watermark so that it is in sync when we call strategy.allocate()
        checkpointBalance = checkpointBalance.add(underlyingAmount);
        // At this point checkpointBalance == getTotalUnderlying()

        strategy.allocate(); // should not change total

        _updateCheckpointBalance(_getTotalUnderlying()); // force a sync after allocation

        emit Enter(msg.sender, _tokenAddress, _tokenAmount, underlyingAmount, share);
    }

    // Unlocks the staked + gained underlying and burns share
    function leave(uint256 _share) external override whenNotPaused nonReentrant returns (uint256 underlyingAmount) {
        require(_share > 0, "V:S_ZERO");

        // if total is above checkpoint then it should be >= checkpoint after
        // if total is below checkpoint then it should be <= checkpoint after

        // Apply any outstanding fees and get the amount of underlying locked in the contract
        uint256 totalUnderlyingBefore = _applyFee();
        // NOTE: Checkpoint may be below total underlying
        bool belowCheckpoint = totalUnderlyingBefore < checkpointBalance;

        // Gets the amount of share in existence
        uint256 totalShares = totalSupply();
        // _share must be positive so this also ensures that totalShares is positive
        require(_share <= totalShares, "V:INVLD_S");

        uint256 needUnderlyingAmount = _share.mul(totalUnderlyingBefore).div(totalShares);
        uint256 haveUnderlyingAmount = underlying.balanceOf(address(this));
        if (needUnderlyingAmount > haveUnderlyingAmount) {
            needUnderlyingAmount = needUnderlyingAmount.sub(haveUnderlyingAmount);
            strategy.deallocate(needUnderlyingAmount); // deallocate what we need
        }
        // After deallocation we will have at least _share/totalShares available as underlying

        // Update our total to reflect costs of unwinding
        uint256 totalUnderlying = _getTotalUnderlying();

        // Calculates the amount of underlying the shares is worth
        underlyingAmount = _share.mul(totalUnderlying).div(totalShares);
        require(underlyingAmount > 0, "V:ZERO_REDEEM");
        require(underlyingAmount <= underlying.balanceOf(address(this)), "V:BAD_STRAT_DEALLOC");

        {
            uint256 newCheckpointBalance;
            if (belowCheckpoint) {
                // Scale the checkpoint to match the new total
                // C = C * (S - s) / S;
                newCheckpointBalance = checkpointBalance.mul(totalShares.sub(_share)).div(totalShares);
            } else {
                // Checkpoint balance matched beforehand so make sure it matches afterward
                newCheckpointBalance = totalUnderlying.sub(underlyingAmount);
            }
            _updateCheckpointBalance(newCheckpointBalance);
        }

        burn(msg.sender, _share);
        underlying.safeTransfer(msg.sender, underlyingAmount);

        emit Leave(msg.sender, _share, underlyingAmount);
    }

    function _transferShareOfToken(
        address _token,
        uint256 _share,
        uint256 _totalShares
    ) private returns (uint256 transferredAmount) {
        uint256 totalAmount = IERC20(_token).balanceOf(address(this));
        if (totalAmount > 0) {
            transferredAmount = totalAmount.mul(_share).div(_totalShares);
            if (transferredAmount > 0) {
                IERC20(_token).safeTransfer(msg.sender, transferredAmount);
            }
        }
    }

    function leaveInKind(uint256 _share) external override nonReentrant {
        require(_share > 0, "V:S_ZERO");

        bool belowCheckpoint;
        {
            // NOTE: Checkpoint may be below total underlying
            uint256 totalUnderlying = _applyFee();
            belowCheckpoint = totalUnderlying < checkpointBalance;
        }
        uint256 totalShares = totalSupply();

        // _share must be positive so this also ensures that totalShares is positive
        require(_share <= totalShares, "V:INVLD_S");

        burn(msg.sender, _share);

        // Send share of underlying
        bool sentSomething = _transferShareOfToken(address(underlying), _share, totalShares) > 0;
        // Send share of each borrowable
        uint256 numBorrowables = borrowables.length;
        for (uint256 i = 0; i < numBorrowables; i++) {
            IBorrowable borrowable = borrowables[i];
            if (_transferShareOfToken(address(borrowable), _share, totalShares) > 0) {
                sentSomething = true;
            }
        }

        // Ensure we sent something
        require(sentSomething, "V:ZERO_AMOUNT");

        {
            uint256 newCheckpointBalance;
            if (belowCheckpoint) {
                // Scale the checkpoint to match the new total
                // C = C * (S - s) / S;
                newCheckpointBalance = checkpointBalance.mul(totalShares.sub(_share)).div(totalShares);
            } else {
                // Checkpoint balance matched beforehand so make sure it matches afterward
                newCheckpointBalance = _getTotalUnderlying();
            }
            _updateCheckpointBalance(newCheckpointBalance);
        }

        emit LeaveInKind(msg.sender, _share);
    }

    function reallocate(uint256 _share, bytes calldata _data) external override nonReentrant {
        require(msg.sender == owner() || msg.sender == reallocateManager, "V:NOT_AUTHORIZED");

        // Apply any outstanding fees and get the amount of underlying locked in the contract
        uint256 totalUnderlyingBefore = _applyFee();
        // NOTE: Checkpoint may be below total underlying
        bool belowCheckpoint = totalUnderlyingBefore < checkpointBalance;

        // Gets the amount of share in existence
        uint256 totalShares = totalSupply();
        // _share must be positive so this also ensures that totalShares is positive
        require(_share <= totalShares, "V:INVLD_S");

        uint256 underlyingAmount = _share.mul(totalUnderlyingBefore).div(totalShares);
        strategy.reallocate(underlyingAmount, _data);

        if (belowCheckpoint) {
            // no-op
        } else {
            // Checkpoint balance matched beforehand so make sure it matches afterward
            _updateCheckpointBalance(_getTotalUnderlying());
        }

        emit Reallocate(msg.sender, _share);
    }

    function allocateIntoBorrowable(IBorrowable borrowable, uint256 underlyingAmount) external override onlyStrategy {
        require(borrowableInfo[borrowable].enabled, "V:NOT_ENABLED");

        uint256 borrowableBalanceBefore = borrowable.balanceOf(address(this));
        underlying.safeTransfer(address(borrowable), underlyingAmount);
        borrowable.mint(address(this));
        uint256 borrowableAmount = borrowable.balanceOf(address(this)).sub(borrowableBalanceBefore);

        emit AllocateBorrowable(address(borrowable), underlyingAmount, borrowableAmount);
    }

    function deallocateFromBorrowable(IBorrowable borrowable, uint256 borrowableAmount) external override onlyStrategy {
        require(borrowableInfo[borrowable].exists, "V:NOT_EXISTS");

        uint256 underlyingBalanceBefore = underlying.balanceOf(address(this));
        IERC20(address(borrowable)).safeTransfer(address(borrowable), borrowableAmount);
        borrowable.redeem(address(this));
        uint256 underlyingAmount = underlying.balanceOf(address(this)).sub(underlyingBalanceBefore);

        emit DeallocateBorrowable(address(borrowable), borrowableAmount, underlyingAmount);
    }

    // returns the total amount of underlying an address has in the supply vault
    function underlyingBalanceForAccount(address _account)
        external
        override
        nonReentrant
        returns (uint256 underlyingBalance)
    {
        uint256 totalUnderlying = _applyFee();
        uint256 shareAmount = balanceOf(_account);
        uint256 totalShares = totalSupply();
        underlyingBalance = shareAmount.mul(totalUnderlying).div(totalShares);
    }

    // Returns how much underlying we get for a given amount of share
    function shareValuedAsUnderlying(uint256 _share)
        external
        override
        nonReentrant
        returns (uint256 underlyingAmount_)
    {
        uint256 totalUnderlying = _applyFee();
        uint256 totalShares = totalSupply();
        underlyingAmount_ = _share.mul(totalUnderlying).div(totalShares);
    }

    // Returns how much share we get for depositing a given amount of underlying
    function underlyingValuedAsShare(uint256 _underlyingAmount)
        external
        override
        nonReentrant
        returns (uint256 share_)
    {
        uint256 totalUnderlying = _applyFee();
        uint256 totalShares = totalSupply();

        if (totalShares == 0) {
            if (totalUnderlying == 0) {
                // If no shares exists, mint it 1:1 to the amount put in
                share_ = _underlyingAmount;
            } else {
                // No shares but we have a non-zero balance of underlying so mint 1:1 including existing balance
                share_ = _underlyingAmount.add(totalUnderlying);
            }
        } else {
            // Shares are non-zero but we have a zero balance of underlying
            // Cannot happen because checkpoint balance would have been above zero
            require(totalUnderlying > 0, "V:TU_ZERO");

            // Calculate and mint the amount of shares the underlying is worth.
            // The ratio will change overtime, as shares are burned/minted and underlying deposited + gained from fees / withdrawn.
            share_ = _underlyingAmount.mul(totalShares).div(totalUnderlying);
        }
    }

    function getSupplyRate() external override nonReentrant returns (uint256 supplyRate_) {
        if (address(strategy) == address(0)) {
            return 0;
        }
        return strategy.getSupplyRate();
    }

    function applyFee() external override nonReentrant {
        _applyFee();
    }

    function _updateCheckpointBalance(uint256 _newCheckpointBalance) private {
        checkpointBalance = _newCheckpointBalance;
        emit UpdateCheckpoint(_newCheckpointBalance);
    }

    // Apply fees and return back the total underlying
    function _applyFee() private returns (uint256 totalUnderlying) {
        totalUnderlying = _getTotalUnderlying();

        if (totalUnderlying > checkpointBalance) {
            if (feeTo != address(0)) {
                uint256 gain = totalUnderlying.sub(checkpointBalance);
                uint256 fee = gain.mul(feeBps).div(MAX_BPS); // fee < gain
                // gain >= fee * MAX_BPS / feeBps
                // totalBalance - gain >= 0
                // totalBalance - fee > 0

                // (gain * Fee%) * Supply / (U - (gain * Fee%))
                if (fee > 0) {
                    uint256 totalShares = totalSupply();
                    // X = F * S / (U - F)
                    uint256 feeShares = fee.mul(totalShares).div(totalUnderlying.sub(fee));
                    if (feeShares > 0) {
                        mint(feeTo, feeShares);

                        emit ApplyFee(feeTo, gain, fee, feeShares);
                    }
                }
            }

            // Update our fee collection checkpoint watermark
            _updateCheckpointBalance(totalUnderlying);
        }
    }

    modifier onlyStrategy() {
        require(msg.sender == address(strategy), "V:STRAT");
        _;
    }

    //////
    // Copied and modified from YAM code:
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernanceStorage.sol
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernance.sol
    // Which is copied and modified from COMPOUND:
    // https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol

    // A record of each accounts delegate
    mapping(address => address) internal _delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH =
        keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH =
        keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    // A record of states for signing / validating signatures
    mapping(address => uint) public nonces;

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    function burn(address _from, uint256 _amount) private {
        _burn(_from, _amount);
        _moveDelegates(_delegates[_from], address(0), _amount);
    }

    function mint(address recipient, uint256 _amount) private {
        _mint(recipient, _amount);

        _initDelegates(recipient);

        _moveDelegates(address(0), _delegates[recipient], _amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        bool result = super.transferFrom(sender, recipient, amount); // Call parent hook

        _initDelegates(recipient);

        _moveDelegates(_delegates[sender], _delegates[recipient], amount);

        return result;
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        bool result = super.transfer(recipient, amount); // Call parent hook

        _initDelegates(recipient);

        _moveDelegates(_delegates[_msgSender()], _delegates[recipient], amount);

        return result;
    }

    // initialize delegates mapping of recipient if not already
    function _initDelegates(address recipient) internal {
        if (_delegates[recipient] == address(0)) {
            _delegates[recipient] = recipient;
        }
    }

    /**
     * @param delegator The address to get delegates for
     */
    function delegates(address delegator) external view override returns (address) {
        return _delegates[delegator];
    }

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) external override {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        bytes32 domainSeparator = keccak256(
            abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name())), getChainId(), address(this))
        );

        bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));

        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));

        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "V::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "V::delegateBySig: invalid nonce");
        require(block.timestamp <= expiry, "V::delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account) external view override returns (uint256) {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber) external view override returns (uint256) {
        require(blockNumber < block.number, "V::getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

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

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

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee) internal {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator); // balance of underlying BOOs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(
        address srcRep,
        address dstRep,
        uint256 amount
    ) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew = srcRepOld - amount;
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld + amount;
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    ) internal {
        uint32 blockNumber = safe32(block.number, "V::_writeCheckpoint: block number exceeds 32 bits");

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal view returns (uint) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

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

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

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

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.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 ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }

    /**
     * @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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        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);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(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:
     *
     * - `to` 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 = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(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);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @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 { }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        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) {
        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) {
        // 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) {
        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) {
        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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @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. 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) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b > 0, "SafeMath: modulo by zero");
        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) {
        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.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        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) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";

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

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

    bool private _paused;

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

pragma solidity 0.6.12;

library StringHelpers {
    function append(string memory a, string memory b) internal pure returns (string memory) {
        return string(abi.encodePacked(a, b));
    }

    /**
     * Returns the first string if it is not-empty, otherwise the second.
     */
    function orElse(string memory a, string memory b) internal pure returns (string memory) {
        if (bytes(a).length > 0) {
            return a;
        }
        return b;
    }
}

pragma solidity 0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";

import "../interfaces/IBorrowable.sol";

library BorrowableHelpers {
    using SafeMath for uint256;

    uint256 private constant RATE_SCALE = 1e18;

    function borrowableValueOf(IBorrowable borrowable, uint256 underlyingAmount) internal returns (uint256) {
        if (underlyingAmount == 0) {
            return 0;
        }
        uint256 exchangeRate = borrowable.exchangeRate();
        return underlyingAmount.mul(1e18).div(exchangeRate);
    }

    function underlyingValueOf(IBorrowable borrowable, uint256 borrowableAmount) internal returns (uint256) {
        if (borrowableAmount == 0) {
            return 0;
        }
        uint256 exchangeRate = borrowable.exchangeRate();
        return borrowableAmount.mul(exchangeRate).div(1e18);
    }

    function underlyingBalanceOf(IBorrowable borrowable, address account) internal returns (uint256) {
        return underlyingValueOf(borrowable, borrowable.balanceOf(account));
    }

    function myUnderlyingBalance(IBorrowable borrowable) internal returns (uint256) {
        return underlyingValueOf(borrowable, borrowable.balanceOf(address(this)));
    }

    function getNextBorrowRate(
        IBorrowable borrowable,
        uint256 depositAmount,
        uint256 withdrawAmount
    ) internal returns (uint256 borrowRate_, uint256 utilizationRate_) {
        require(depositAmount == 0 || withdrawAmount == 0, "BH: INVLD_DELTA");
        borrowable.accrueInterest();
        {
            uint256 totalBorrows = borrowable.totalBorrows();
            uint256 nextBalance = borrowable.totalBalance().add(totalBorrows);
            if (depositAmount > 0) {
                nextBalance = nextBalance.add(depositAmount);
            }
            if (withdrawAmount > 0) {
                nextBalance = nextBalance.sub(withdrawAmount);
            }
            utilizationRate_ = (nextBalance == 0) ? 0 : totalBorrows.mul(RATE_SCALE).div(nextBalance);
        }

        uint256 kinkUtilizationRate = borrowable.kinkUtilizationRate(); // gas savings

        if (utilizationRate_ <= kinkUtilizationRate) {
            borrowRate_ = borrowable.kinkBorrowRate().mul(utilizationRate_).div(kinkUtilizationRate);
        } else {
            borrowRate_ = borrowable.KINK_MULTIPLIER().sub(1);

            {
                // utilizationRate_ is strictly less than kinkUtilizationRate
                uint256 overUtilization = utilizationRate_.sub(kinkUtilizationRate).mul(RATE_SCALE).div(
                    RATE_SCALE.sub(kinkUtilizationRate)
                );
                borrowRate_ = borrowRate_.mul(overUtilization);
            }

            borrowRate_ = borrowRate_.add(RATE_SCALE).mul(borrowable.kinkBorrowRate()).div(RATE_SCALE);
        }

        borrowRate_ = uint48(borrowRate_);
    }

    function getNextSupplyRate(
        IBorrowable borrowable,
        uint256 depositAmount,
        uint256 withdrawAmount
    )
        internal
        returns (
            uint256 supplyRate_,
            uint256 borrowRate_,
            uint256 utilizationRate_
        )
    {
        (borrowRate_, utilizationRate_) = getNextBorrowRate(borrowable, depositAmount, withdrawAmount);

        supplyRate_ = borrowRate_
            .mul(utilizationRate_)
            .div(RATE_SCALE)
            .mul(RATE_SCALE.sub(borrowable.reserveFactor()))
            .div(RATE_SCALE);
    }

    function getCurrentBorrowRate(IBorrowable borrowable)
        internal
        returns (uint256 borrowRate_, uint256 utilizationRate_)
    {
        return getNextBorrowRate(borrowable, 0, 0);
    }

    function getCurrentSupplyRate(IBorrowable borrowable)
        internal
        returns (
            uint256 supplyRate_,
            uint256 borrowRate_,
            uint256 utilizationRate_
        )
    {
        return getNextSupplyRate(borrowable, 0, 0);
    }
}

pragma solidity >=0.5.0;

import "./IBorrowable.sol";
import "./ISupplyVault.sol";

interface ISupplyVaultStrategy {
    function getBorrowable(address _address) external view returns (IBorrowable);

    function getSupplyRate() external returns (uint256 supplyRate_);

    function allocate() external;

    function deallocate(uint256 _underlyingAmount) external;

    function reallocate(uint256 _underlyingAmount, bytes calldata _data) external;
}

pragma solidity >=0.5.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IBorrowable.sol";
import "./ISupplyVaultStrategy.sol";

interface ISupplyVault {
    /* Vault */
    function enter(uint256 _amount) external returns (uint256 share);

    function enterWithToken(address _tokenAddress, uint256 _tokenAmount) external returns (uint256 share);

    function leave(uint256 _share) external returns (uint256 underlyingAmount);

    function leaveInKind(uint256 _share) external;

    function applyFee() external;

    /** Read */

    function getBorrowablesLength() external view returns (uint256);

    function getBorrowableEnabled(IBorrowable borrowable) external view returns (bool);

    function getBorrowableExists(IBorrowable borrowable) external view returns (bool);

    function indexOfBorrowable(IBorrowable borrowable) external view returns (uint256);

    function borrowables(uint256) external view returns (IBorrowable);

    function underlying() external view returns (IERC20);

    function strategy() external view returns (ISupplyVaultStrategy);

    function pendingStrategy() external view returns (ISupplyVaultStrategy);

    function pendingStrategyNotBefore() external view returns (uint256);

    function feeBps() external view returns (uint256);

    function feeTo() external view returns (address);

    function reallocateManager() external view returns (address);

    /* Read functions that are non-view due to updating exchange rates */
    function underlyingBalanceForAccount(address _account) external returns (uint256 underlyingBalance);

    function shareValuedAsUnderlying(uint256 _share) external returns (uint256 underlyingAmount_);

    function underlyingValuedAsShare(uint256 _underlyingAmount) external returns (uint256 share_);

    function getTotalUnderlying() external returns (uint256 totalUnderlying);

    function getSupplyRate() external returns (uint256 supplyRate_);

    /* Only from strategy */

    function allocateIntoBorrowable(IBorrowable borrowable, uint256 underlyingAmount) external;

    function deallocateFromBorrowable(IBorrowable borrowable, uint256 borrowableAmount) external;

    function reallocate(uint256 _share, bytes calldata _data) external;

    /* Only owner */
    function addBorrowable(address _address) external;

    function addBorrowables(address[] calldata _addressList) external;

    function removeBorrowable(IBorrowable borrowable) external;

    function disableBorrowable(IBorrowable borrowable) external;

    function enableBorrowable(IBorrowable borrowable) external;

    function unwindBorrowable(IBorrowable borrowable, uint256 borowableAmount) external;

    function updatePendingStrategy(ISupplyVaultStrategy _newPendingStrategy, uint256 _notBefore) external;

    function updateStrategy() external;

    function updateFeeBps(uint256 _newFeeBps) external;

    function updateFeeTo(address _newFeeTo) external;

    function updateReallocateManager(address _newReallocateManager) external;

    function pause() external;

    function unpause() external;

    /* Voting */
    function delegates(address delegator) external view returns (address);

    function delegate(address delegatee) external;

    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

    function getPriorVotes(address account, uint blockNumber) external view returns (uint256);

    /* Events */
    event AddBorrowable(address indexed borrowable);
    event RemoveBorrowable(address indexed borrowable);
    event EnableBorrowable(address indexed borrowable);
    event DisableBorrowable(address indexed borrowable);
    event UpdatePendingStrategy(address indexed strategy, uint256 notBefore);
    event UpdateStrategy(address indexed strategy);
    event UpdateFeeBps(uint256 newFeeBps);
    event UpdateFeeTo(address indexed newFeeTo);
    event UpdateReallocateManager(address indexed newReallocateManager);
    event UnwindBorrowable(address indexed borrowable, uint256 underlyingAmount, uint256 borrowableAmount);
    event Enter(
        address indexed who,
        address indexed token,
        uint256 tokenAmount,
        uint256 underlyingAmount,
        uint256 share
    );
    event Leave(address indexed who, uint256 share, uint256 underlyingAmount);
    event LeaveInKind(address indexed who, uint256 share);
    event Reallocate(address indexed sender, uint256 share);
    event AllocateBorrowable(address indexed borrowable, uint256 underlyingAmount, uint256 borrowableAmount);
    event DeallocateBorrowable(address indexed borrowable, uint256 borrowableAmount, uint256 underlyingAmount);

    event ApplyFee(address indexed feeTo, uint256 gain, uint256 fee, uint256 feeShare);
    event UpdateCheckpoint(uint256 checkpointBalance);
}

pragma solidity >=0.5.0;

interface IBorrowable {
    /*** Tarot ERC20 ***/

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

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

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

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

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

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

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /*** Pool Token ***/

    event Mint(
        address indexed sender,
        address indexed minter,
        uint256 mintAmount,
        uint256 mintTokens
    );
    event Redeem(
        address indexed sender,
        address indexed redeemer,
        uint256 redeemAmount,
        uint256 redeemTokens
    );
    event Sync(uint256 totalBalance);

    function underlying() external view returns (address);

    function factory() external view returns (address);

    function totalBalance() external view returns (uint256);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function exchangeRate() external returns (uint256);

    function mint(address minter) external returns (uint256 mintTokens);

    function redeem(address redeemer) external returns (uint256 redeemAmount);

    function skim(address to) external;

    function sync() external;

    function _setFactory() external;

    /*** Borrowable ***/

    event BorrowApproval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Borrow(
        address indexed sender,
        address indexed borrower,
        address indexed receiver,
        uint256 borrowAmount,
        uint256 repayAmount,
        uint256 accountBorrowsPrior,
        uint256 accountBorrows,
        uint256 totalBorrows
    );
    event Liquidate(
        address indexed sender,
        address indexed borrower,
        address indexed liquidator,
        uint256 seizeTokens,
        uint256 repayAmount,
        uint256 accountBorrowsPrior,
        uint256 accountBorrows,
        uint256 totalBorrows
    );

    function BORROW_FEE() external pure returns (uint256);

    function collateral() external view returns (address);

    function reserveFactor() external view returns (uint256);

    function exchangeRateLast() external view returns (uint256);

    function borrowIndex() external view returns (uint256);

    function totalBorrows() external view returns (uint256);

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

    function borrowBalance(address borrower) external view returns (uint256);

    function borrowTracker() external view returns (address);

    function BORROW_PERMIT_TYPEHASH() external pure returns (bytes32);

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

    function borrowPermit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function borrow(
        address borrower,
        address receiver,
        uint256 borrowAmount,
        bytes calldata data
    ) external;

    function liquidate(address borrower, address liquidator)
        external
        returns (uint256 seizeTokens);

    function trackBorrow(address borrower) external;

    /*** Borrowable Interest Rate Model ***/

    event AccrueInterest(
        uint256 interestAccumulated,
        uint256 borrowIndex,
        uint256 totalBorrows
    );
    event CalculateKink(uint256 kinkRate);
    event CalculateBorrowRate(uint256 borrowRate);

    function KINK_BORROW_RATE_MAX() external pure returns (uint256);

    function KINK_BORROW_RATE_MIN() external pure returns (uint256);

    function KINK_MULTIPLIER() external pure returns (uint256);

    function borrowRate() external view returns (uint256);

    function kinkBorrowRate() external view returns (uint256);

    function kinkUtilizationRate() external view returns (uint256);

    function adjustSpeed() external view returns (uint256);

    function rateUpdateTimestamp() external view returns (uint32);

    function accrualTimestamp() external view returns (uint32);

    function accrueInterest() external;

    /*** Borrowable Setter ***/

    event NewReserveFactor(uint256 newReserveFactor);
    event NewKinkUtilizationRate(uint256 newKinkUtilizationRate);
    event NewAdjustSpeed(uint256 newAdjustSpeed);
    event NewBorrowTracker(address newBorrowTracker);

    function RESERVE_FACTOR_MAX() external pure returns (uint256);

    function KINK_UR_MIN() external pure returns (uint256);

    function KINK_UR_MAX() external pure returns (uint256);

    function ADJUST_SPEED_MIN() external pure returns (uint256);

    function ADJUST_SPEED_MAX() external pure returns (uint256);

    function _initialize(
        string calldata _name,
        string calldata _symbol,
        address _underlying,
        address _collateral
    ) external;

    function _setReserveFactor(uint256 newReserveFactor) external;

    function _setKinkUtilizationRate(uint256 newKinkUtilizationRate) external;

    function _setAdjustSpeed(uint256 newAdjustSpeed) external;

    function _setBorrowTracker(address newBorrowTracker) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 >=0.6.2 <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 >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _underlying (address): 0x6c021ae822bea943b2e66552bde1d2696a53fbb7
Arg [1] : _strategy (address): 0x1c2ae35e346dc4cdfadc252cd5d4172334f0b59b
Arg [2] : _name (string): Tarot TOMB Supply Vault
Arg [3] : _symbol (string): tTOMB
Arg [4] : _decimals (uint8): 0

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000006c021ae822bea943b2e66552bde1d2696a53fbb7
Arg [1] : 0000000000000000000000001c2ae35e346dc4cdfadc252cd5d4172334f0b59b
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000017
Arg [6] : 5461726f7420544f4d4220537570706c79205661756c74000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [8] : 74544f4d42000000000000000000000000000000000000000000000000000000