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// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/math/SignedSafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../../../core/fund/comptroller/ComptrollerLib.sol";
import "../FeeManager.sol";
import "./utils/FeeBase.sol";

/// @title PerformanceFee Contract
/// @author Enzyme Council <[email protected]>
/// @notice A performance-based fee with configurable rate and crystallization period, using
/// a high watermark
/// @dev This contract assumes that all shares in the VaultProxy are shares outstanding,
/// which is fine for this release. Even if they are not, they are still shares that
/// are only claimable by the fund owner.
contract PerformanceFee is FeeBase {
    using SafeMath for uint256;
    using SignedSafeMath for int256;

    event ActivatedForFund(address indexed comptrollerProxy, uint256 highWaterMark);

    event FundSettingsAdded(address indexed comptrollerProxy, uint256 rate, uint256 period);

    event LastSharePriceUpdated(
        address indexed comptrollerProxy,
        uint256 prevSharePrice,
        uint256 nextSharePrice
    );

    event PaidOut(
        address indexed comptrollerProxy,
        uint256 prevHighWaterMark,
        uint256 nextHighWaterMark,
        uint256 aggregateValueDue
    );

    event PerformanceUpdated(
        address indexed comptrollerProxy,
        uint256 prevAggregateValueDue,
        uint256 nextAggregateValueDue,
        int256 sharesOutstandingDiff
    );

    struct FeeInfo {
        uint256 rate;
        uint256 period;
        uint256 activated;
        uint256 lastPaid;
        uint256 highWaterMark;
        uint256 lastSharePrice;
        uint256 aggregateValueDue;
    }

    uint256 private constant RATE_DIVISOR = 10**18;
    uint256 private constant SHARE_UNIT = 10**18;

    mapping(address => FeeInfo) private comptrollerProxyToFeeInfo;

    constructor(address _feeManager) public FeeBase(_feeManager) {}

    // EXTERNAL FUNCTIONS

    /// @notice Activates the fee for a fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    function activateForFund(address _comptrollerProxy, address) external override onlyFeeManager {
        FeeInfo storage feeInfo = comptrollerProxyToFeeInfo[_comptrollerProxy];

        // We must not force asset finality, otherwise funds that have Synths as tracked assets
        // would be susceptible to a DoS attack when attempting to migrate to a release that uses
        // this fee: an attacker trades a negligible amount of a tracked Synth with the VaultProxy
        // as the recipient, thus causing `calcGrossShareValue(true)` to fail.
        (uint256 grossSharePrice, bool sharePriceIsValid) = ComptrollerLib(_comptrollerProxy)
            .calcGrossShareValue(false);
        require(sharePriceIsValid, "activateForFund: Invalid share price");

        feeInfo.highWaterMark = grossSharePrice;
        feeInfo.lastSharePrice = grossSharePrice;
        feeInfo.activated = block.timestamp;

        emit ActivatedForFund(_comptrollerProxy, grossSharePrice);
    }

    /// @notice Add the initial fee settings for a fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _settingsData Encoded settings to apply to the policy for the fund
    /// @dev `highWaterMark`, `lastSharePrice`, and `activated` are set during activation
    function addFundSettings(address _comptrollerProxy, bytes calldata _settingsData)
        external
        override
        onlyFeeManager
    {
        (uint256 feeRate, uint256 feePeriod) = abi.decode(_settingsData, (uint256, uint256));
        require(feeRate > 0, "addFundSettings: feeRate must be greater than 0");
        require(feePeriod > 0, "addFundSettings: feePeriod must be greater than 0");

        comptrollerProxyToFeeInfo[_comptrollerProxy] = FeeInfo({
            rate: feeRate,
            period: feePeriod,
            activated: 0,
            lastPaid: 0,
            highWaterMark: 0,
            lastSharePrice: 0,
            aggregateValueDue: 0
        });

        emit FundSettingsAdded(_comptrollerProxy, feeRate, feePeriod);
    }

    /// @notice Provides a constant string identifier for a fee
    /// @return identifier_ The identifier string
    function identifier() external pure override returns (string memory identifier_) {
        return "PERFORMANCE";
    }

    /// @notice Gets the hooks that are implemented by the fee
    /// @return implementedHooksForSettle_ The hooks during which settle() is implemented
    /// @return implementedHooksForUpdate_ The hooks during which update() is implemented
    /// @return usesGavOnSettle_ True if GAV is used during the settle() implementation
    /// @return usesGavOnUpdate_ True if GAV is used during the update() implementation
    /// @dev Used only during fee registration
    function implementedHooks()
        external
        view
        override
        returns (
            IFeeManager.FeeHook[] memory implementedHooksForSettle_,
            IFeeManager.FeeHook[] memory implementedHooksForUpdate_,
            bool usesGavOnSettle_,
            bool usesGavOnUpdate_
        )
    {
        implementedHooksForSettle_ = new IFeeManager.FeeHook[](3);
        implementedHooksForSettle_[0] = IFeeManager.FeeHook.Continuous;
        implementedHooksForSettle_[1] = IFeeManager.FeeHook.BuySharesSetup;
        implementedHooksForSettle_[2] = IFeeManager.FeeHook.PreRedeemShares;

        implementedHooksForUpdate_ = new IFeeManager.FeeHook[](3);
        implementedHooksForUpdate_[0] = IFeeManager.FeeHook.Continuous;
        implementedHooksForUpdate_[1] = IFeeManager.FeeHook.BuySharesCompleted;
        implementedHooksForUpdate_[2] = IFeeManager.FeeHook.PreRedeemShares;

        return (implementedHooksForSettle_, implementedHooksForUpdate_, true, true);
    }

    /// @notice Checks whether the shares outstanding for the fee can be paid out, and updates
    /// the info for the fee's last payout
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @return isPayable_ True if shares outstanding can be paid out
    function payout(address _comptrollerProxy, address)
        external
        override
        onlyFeeManager
        returns (bool isPayable_)
    {
        if (!payoutAllowed(_comptrollerProxy)) {
            return false;
        }

        FeeInfo storage feeInfo = comptrollerProxyToFeeInfo[_comptrollerProxy];
        feeInfo.lastPaid = block.timestamp;

        uint256 prevHighWaterMark = feeInfo.highWaterMark;
        uint256 nextHighWaterMark = __calcUint256Max(feeInfo.lastSharePrice, prevHighWaterMark);
        uint256 prevAggregateValueDue = feeInfo.aggregateValueDue;

        // Update state as necessary
        if (prevAggregateValueDue > 0) {
            feeInfo.aggregateValueDue = 0;
        }
        if (nextHighWaterMark > prevHighWaterMark) {
            feeInfo.highWaterMark = nextHighWaterMark;
        }

        emit PaidOut(
            _comptrollerProxy,
            prevHighWaterMark,
            nextHighWaterMark,
            prevAggregateValueDue
        );

        return true;
    }

    /// @notice Settles the fee and calculates shares due
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _vaultProxy The VaultProxy of the fund
    /// @param _gav The GAV of the fund
    /// @return settlementType_ The type of settlement
    /// @return (unused) The payer of shares due
    /// @return sharesDue_ The amount of shares due
    function settle(
        address _comptrollerProxy,
        address _vaultProxy,
        IFeeManager.FeeHook,
        bytes calldata,
        uint256 _gav
    )
        external
        override
        onlyFeeManager
        returns (
            IFeeManager.SettlementType settlementType_,
            address,
            uint256 sharesDue_
        )
    {
        if (_gav == 0) {
            return (IFeeManager.SettlementType.None, address(0), 0);
        }

        int256 settlementSharesDue = __settleAndUpdatePerformance(
            _comptrollerProxy,
            _vaultProxy,
            _gav
        );
        if (settlementSharesDue == 0) {
            return (IFeeManager.SettlementType.None, address(0), 0);
        } else if (settlementSharesDue > 0) {
            // Settle by minting shares outstanding for custody
            return (
                IFeeManager.SettlementType.MintSharesOutstanding,
                address(0),
                uint256(settlementSharesDue)
            );
        } else {
            // Settle by burning from shares outstanding
            return (
                IFeeManager.SettlementType.BurnSharesOutstanding,
                address(0),
                uint256(-settlementSharesDue)
            );
        }
    }

    /// @notice Updates the fee state after all fees have finished settle()
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _vaultProxy The VaultProxy of the fund
    /// @param _hook The FeeHook being executed
    /// @param _settlementData Encoded args to use in calculating the settlement
    /// @param _gav The GAV of the fund
    function update(
        address _comptrollerProxy,
        address _vaultProxy,
        IFeeManager.FeeHook _hook,
        bytes calldata _settlementData,
        uint256 _gav
    ) external override onlyFeeManager {
        uint256 prevSharePrice = comptrollerProxyToFeeInfo[_comptrollerProxy].lastSharePrice;
        uint256 nextSharePrice = __calcNextSharePrice(
            _comptrollerProxy,
            _vaultProxy,
            _hook,
            _settlementData,
            _gav
        );

        if (nextSharePrice == prevSharePrice) {
            return;
        }

        comptrollerProxyToFeeInfo[_comptrollerProxy].lastSharePrice = nextSharePrice;

        emit LastSharePriceUpdated(_comptrollerProxy, prevSharePrice, nextSharePrice);
    }

    // PUBLIC FUNCTIONS

    /// @notice Checks whether the shares outstanding can be paid out
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @return payoutAllowed_ True if the fee payment is due
    /// @dev Payout is allowed if fees have not yet been settled in a crystallization period,
    /// and at least 1 crystallization period has passed since activation
    function payoutAllowed(address _comptrollerProxy) public view returns (bool payoutAllowed_) {
        FeeInfo memory feeInfo = comptrollerProxyToFeeInfo[_comptrollerProxy];
        uint256 period = feeInfo.period;

        uint256 timeSinceActivated = block.timestamp.sub(feeInfo.activated);

        // Check if at least 1 crystallization period has passed since activation
        if (timeSinceActivated < period) {
            return false;
        }

        // Check that a full crystallization period has passed since the last payout
        uint256 timeSincePeriodStart = timeSinceActivated % period;
        uint256 periodStart = block.timestamp.sub(timeSincePeriodStart);
        return feeInfo.lastPaid < periodStart;
    }

    // PRIVATE FUNCTIONS

    /// @dev Helper to calculate the aggregated value accumulated to a fund since the last
    /// settlement (happening at investment/redemption)
    /// Validated:
    /// _netSharesSupply > 0
    /// _sharePriceWithoutPerformance != _prevSharePrice
    function __calcAggregateValueDue(
        uint256 _netSharesSupply,
        uint256 _sharePriceWithoutPerformance,
        uint256 _prevSharePrice,
        uint256 _prevAggregateValueDue,
        uint256 _feeRate,
        uint256 _highWaterMark
    ) private pure returns (uint256) {
        int256 superHWMValueSinceLastSettled = (
            int256(__calcUint256Max(_highWaterMark, _sharePriceWithoutPerformance)).sub(
                int256(__calcUint256Max(_highWaterMark, _prevSharePrice))
            )
        )
            .mul(int256(_netSharesSupply))
            .div(int256(SHARE_UNIT));

        int256 valueDueSinceLastSettled = superHWMValueSinceLastSettled.mul(int256(_feeRate)).div(
            int256(RATE_DIVISOR)
        );

        return
            uint256(
                __calcInt256Max(0, int256(_prevAggregateValueDue).add(valueDueSinceLastSettled))
            );
    }

    /// @dev Helper to calculate the max of two int values
    function __calcInt256Max(int256 _a, int256 _b) private pure returns (int256) {
        if (_a >= _b) {
            return _a;
        }

        return _b;
    }

    /// @dev Helper to calculate the next `lastSharePrice` value
    function __calcNextSharePrice(
        address _comptrollerProxy,
        address _vaultProxy,
        IFeeManager.FeeHook _hook,
        bytes memory _settlementData,
        uint256 _gav
    ) private view returns (uint256 nextSharePrice_) {
        uint256 denominationAssetUnit = 10 **
            uint256(ERC20(ComptrollerLib(_comptrollerProxy).getDenominationAsset()).decimals());
        if (_gav == 0) {
            return denominationAssetUnit;
        }

        // Get shares outstanding via VaultProxy balance and calc shares supply to get net shares supply
        ERC20 vaultProxyContract = ERC20(_vaultProxy);
        uint256 totalSharesSupply = vaultProxyContract.totalSupply();
        uint256 nextNetSharesSupply = totalSharesSupply.sub(
            vaultProxyContract.balanceOf(_vaultProxy)
        );
        if (nextNetSharesSupply == 0) {
            return denominationAssetUnit;
        }

        uint256 nextGav = _gav;

        // For both Continuous and BuySharesCompleted hooks, _gav and shares supply will not change,
        // we only need additional calculations for PreRedeemShares
        if (_hook == IFeeManager.FeeHook.PreRedeemShares) {
            (, uint256 sharesDecrease) = __decodePreRedeemSharesSettlementData(_settlementData);

            // Shares have not yet been burned
            nextNetSharesSupply = nextNetSharesSupply.sub(sharesDecrease);
            if (nextNetSharesSupply == 0) {
                return denominationAssetUnit;
            }

            // Assets have not yet been withdrawn
            uint256 gavDecrease = _gav.mul(sharesDecrease).div(totalSharesSupply);

            nextGav = nextGav.sub(gavDecrease);
            if (nextGav == 0) {
                return denominationAssetUnit;
            }
        }

        return nextGav.mul(SHARE_UNIT).div(nextNetSharesSupply);
    }

    /// @dev Helper to calculate the performance metrics for a fund.
    /// Validated:
    /// _totalSharesSupply > 0
    /// _gav > 0
    /// _totalSharesSupply != _totalSharesOutstanding
    function __calcPerformance(
        address _comptrollerProxy,
        uint256 _totalSharesSupply,
        uint256 _totalSharesOutstanding,
        uint256 _prevAggregateValueDue,
        FeeInfo memory feeInfo,
        uint256 _gav
    ) private view returns (uint256 nextAggregateValueDue_, int256 sharesDue_) {
        // Use the 'shares supply net shares outstanding' for performance calcs.
        // Cannot be 0, as _totalSharesSupply != _totalSharesOutstanding
        uint256 netSharesSupply = _totalSharesSupply.sub(_totalSharesOutstanding);
        uint256 sharePriceWithoutPerformance = _gav.mul(SHARE_UNIT).div(netSharesSupply);

        // If gross share price has not changed, can exit early
        uint256 prevSharePrice = feeInfo.lastSharePrice;
        if (sharePriceWithoutPerformance == prevSharePrice) {
            return (_prevAggregateValueDue, 0);
        }

        nextAggregateValueDue_ = __calcAggregateValueDue(
            netSharesSupply,
            sharePriceWithoutPerformance,
            prevSharePrice,
            _prevAggregateValueDue,
            feeInfo.rate,
            feeInfo.highWaterMark
        );

        sharesDue_ = __calcSharesDue(
            _comptrollerProxy,
            netSharesSupply,
            _gav,
            nextAggregateValueDue_
        );

        return (nextAggregateValueDue_, sharesDue_);
    }

    /// @dev Helper to calculate sharesDue during settlement.
    /// Validated:
    /// _netSharesSupply > 0
    /// _gav > 0
    function __calcSharesDue(
        address _comptrollerProxy,
        uint256 _netSharesSupply,
        uint256 _gav,
        uint256 _nextAggregateValueDue
    ) private view returns (int256 sharesDue_) {
        // If _nextAggregateValueDue > _gav, then no shares can be created.
        // This is a known limitation of the model, which is only reached for unrealistically
        // high performance fee rates (> 100%). A revert is allowed in such a case.
        uint256 sharesDueForAggregateValueDue = _nextAggregateValueDue.mul(_netSharesSupply).div(
            _gav.sub(_nextAggregateValueDue)
        );

        // Shares due is the +/- diff or the total shares outstanding already minted
        return
            int256(sharesDueForAggregateValueDue).sub(
                int256(
                    FeeManager(FEE_MANAGER).getFeeSharesOutstandingForFund(
                        _comptrollerProxy,
                        address(this)
                    )
                )
            );
    }

    /// @dev Helper to calculate the max of two uint values
    function __calcUint256Max(uint256 _a, uint256 _b) private pure returns (uint256) {
        if (_a >= _b) {
            return _a;
        }

        return _b;
    }

    /// @dev Helper to settle the fee and update performance state.
    /// Validated:
    /// _gav > 0
    function __settleAndUpdatePerformance(
        address _comptrollerProxy,
        address _vaultProxy,
        uint256 _gav
    ) private returns (int256 sharesDue_) {
        ERC20 sharesTokenContract = ERC20(_vaultProxy);

        uint256 totalSharesSupply = sharesTokenContract.totalSupply();
        if (totalSharesSupply == 0) {
            return 0;
        }

        uint256 totalSharesOutstanding = sharesTokenContract.balanceOf(_vaultProxy);
        if (totalSharesOutstanding == totalSharesSupply) {
            return 0;
        }

        FeeInfo storage feeInfo = comptrollerProxyToFeeInfo[_comptrollerProxy];
        uint256 prevAggregateValueDue = feeInfo.aggregateValueDue;

        uint256 nextAggregateValueDue;
        (nextAggregateValueDue, sharesDue_) = __calcPerformance(
            _comptrollerProxy,
            totalSharesSupply,
            totalSharesOutstanding,
            prevAggregateValueDue,
            feeInfo,
            _gav
        );
        if (nextAggregateValueDue == prevAggregateValueDue) {
            return 0;
        }

        // Update fee state
        feeInfo.aggregateValueDue = nextAggregateValueDue;

        emit PerformanceUpdated(
            _comptrollerProxy,
            prevAggregateValueDue,
            nextAggregateValueDue,
            sharesDue_
        );

        return sharesDue_;
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the feeInfo for a given fund
    /// @param _comptrollerProxy The ComptrollerProxy contract of the fund
    /// @return feeInfo_ The feeInfo
    function getFeeInfoForFund(address _comptrollerProxy)
        external
        view
        returns (FeeInfo memory feeInfo_)
    {
        return comptrollerProxyToFeeInfo[_comptrollerProxy];
    }
}

// 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;

/**
 * @title SignedSafeMath
 * @dev Signed math operations with safety checks that revert on error.
 */
library SignedSafeMath {
    int256 constant private _INT256_MIN = -2**255;

    /**
     * @dev Returns the multiplication of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(int256 a, int256 b) internal pure returns (int256) {
        // 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 0;
        }

        require(!(a == -1 && b == _INT256_MIN), "SignedSafeMath: multiplication overflow");

        int256 c = a * b;
        require(c / a == b, "SignedSafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two signed integers. Reverts 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(int256 a, int256 b) internal pure returns (int256) {
        require(b != 0, "SignedSafeMath: division by zero");
        require(!(b == -1 && a == _INT256_MIN), "SignedSafeMath: division overflow");

        int256 c = a / b;

        return c;
    }

    /**
     * @dev Returns the subtraction of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a), "SignedSafeMath: subtraction overflow");

        return c;
    }

    /**
     * @dev Returns the addition of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a), "SignedSafeMath: addition overflow");

        return c;
    }
}

// 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 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 >=0.6.0 <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 >=0.6.2 <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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IDispatcher Interface
/// @author Enzyme Council <[email protected]>
interface IDispatcher {
    function cancelMigration(address _vaultProxy, bool _bypassFailure) external;

    function claimOwnership() external;

    function deployVaultProxy(
        address _vaultLib,
        address _owner,
        address _vaultAccessor,
        string calldata _fundName
    ) external returns (address vaultProxy_);

    function executeMigration(address _vaultProxy, bool _bypassFailure) external;

    function getCurrentFundDeployer() external view returns (address currentFundDeployer_);

    function getFundDeployerForVaultProxy(address _vaultProxy)
        external
        view
        returns (address fundDeployer_);

    function getMigrationRequestDetailsForVaultProxy(address _vaultProxy)
        external
        view
        returns (
            address nextFundDeployer_,
            address nextVaultAccessor_,
            address nextVaultLib_,
            uint256 executableTimestamp_
        );

    function getMigrationTimelock() external view returns (uint256 migrationTimelock_);

    function getNominatedOwner() external view returns (address nominatedOwner_);

    function getOwner() external view returns (address owner_);

    function getSharesTokenSymbol() external view returns (string memory sharesTokenSymbol_);

    function getTimelockRemainingForMigrationRequest(address _vaultProxy)
        external
        view
        returns (uint256 secondsRemaining_);

    function hasExecutableMigrationRequest(address _vaultProxy)
        external
        view
        returns (bool hasExecutableRequest_);

    function hasMigrationRequest(address _vaultProxy)
        external
        view
        returns (bool hasMigrationRequest_);

    function removeNominatedOwner() external;

    function setCurrentFundDeployer(address _nextFundDeployer) external;

    function setMigrationTimelock(uint256 _nextTimelock) external;

    function setNominatedOwner(address _nextNominatedOwner) external;

    function setSharesTokenSymbol(string calldata _nextSymbol) external;

    function signalMigration(
        address _vaultProxy,
        address _nextVaultAccessor,
        address _nextVaultLib,
        bool _bypassFailure
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IMigratableVault Interface
/// @author Enzyme Council <[email protected]>
/// @dev DO NOT EDIT CONTRACT
interface IMigratableVault {
    function canMigrate(address _who) external view returns (bool canMigrate_);

    function init(
        address _owner,
        address _accessor,
        string calldata _fundName
    ) external;

    function setAccessor(address _nextAccessor) external;

    function setVaultLib(address _nextVaultLib) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IFundDeployer Interface
/// @author Enzyme Council <[email protected]>
interface IFundDeployer {
    enum ReleaseStatus {PreLaunch, Live, Paused}

    function getOwner() external view returns (address);

    function getReleaseStatus() external view returns (ReleaseStatus);

    function isRegisteredVaultCall(address, bytes4) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../../../../persistent/dispatcher/IDispatcher.sol";
import "../../../extensions/IExtension.sol";
import "../../../extensions/fee-manager/IFeeManager.sol";
import "../../../extensions/policy-manager/IPolicyManager.sol";
import "../../../infrastructure/price-feeds/primitives/IPrimitivePriceFeed.sol";
import "../../../infrastructure/value-interpreter/IValueInterpreter.sol";
import "../../../utils/AddressArrayLib.sol";
import "../../../utils/AssetFinalityResolver.sol";
import "../../fund-deployer/IFundDeployer.sol";
import "../vault/IVault.sol";
import "./IComptroller.sol";

/// @title ComptrollerLib Contract
/// @author Enzyme Council <[email protected]>
/// @notice The core logic library shared by all funds
contract ComptrollerLib is IComptroller, AssetFinalityResolver {
    using AddressArrayLib for address[];
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    event MigratedSharesDuePaid(uint256 sharesDue);

    event OverridePauseSet(bool indexed overridePause);

    event PreRedeemSharesHookFailed(
        bytes failureReturnData,
        address redeemer,
        uint256 sharesQuantity
    );

    event SharesBought(
        address indexed caller,
        address indexed buyer,
        uint256 investmentAmount,
        uint256 sharesIssued,
        uint256 sharesReceived
    );

    event SharesRedeemed(
        address indexed redeemer,
        uint256 sharesQuantity,
        address[] receivedAssets,
        uint256[] receivedAssetQuantities
    );

    event VaultProxySet(address vaultProxy);

    // Constants and immutables - shared by all proxies
    uint256 private constant SHARES_UNIT = 10**18;
    address private immutable DISPATCHER;
    address private immutable FUND_DEPLOYER;
    address private immutable FEE_MANAGER;
    address private immutable INTEGRATION_MANAGER;
    address private immutable PRIMITIVE_PRICE_FEED;
    address private immutable POLICY_MANAGER;
    address private immutable VALUE_INTERPRETER;

    // Pseudo-constants (can only be set once)

    address internal denominationAsset;
    address internal vaultProxy;
    // True only for the one non-proxy
    bool internal isLib;

    // Storage

    // Allows a fund owner to override a release-level pause
    bool internal overridePause;
    // A reverse-mutex, granting atomic permission for particular contracts to make vault calls
    bool internal permissionedVaultActionAllowed;
    // A mutex to protect against reentrancy
    bool internal reentranceLocked;
    // A timelock between any "shares actions" (i.e., buy and redeem shares), per-account
    uint256 internal sharesActionTimelock;
    mapping(address => uint256) internal acctToLastSharesAction;

    ///////////////
    // MODIFIERS //
    ///////////////

    modifier allowsPermissionedVaultAction {
        __assertPermissionedVaultActionNotAllowed();
        permissionedVaultActionAllowed = true;
        _;
        permissionedVaultActionAllowed = false;
    }

    modifier locksReentrance() {
        __assertNotReentranceLocked();
        reentranceLocked = true;
        _;
        reentranceLocked = false;
    }

    modifier onlyActive() {
        __assertIsActive(vaultProxy);
        _;
    }

    modifier onlyNotPaused() {
        __assertNotPaused();
        _;
    }

    modifier onlyFundDeployer() {
        __assertIsFundDeployer(msg.sender);
        _;
    }

    modifier onlyOwner() {
        __assertIsOwner(msg.sender);
        _;
    }

    modifier timelockedSharesAction(address _account) {
        __assertSharesActionNotTimelocked(_account);
        _;
        acctToLastSharesAction[_account] = block.timestamp;
    }

    // ASSERTION HELPERS

    // Modifiers are inefficient in terms of contract size,
    // so we use helper functions to prevent repetitive inlining of expensive string values.

    /// @dev Since vaultProxy is set during activate(),
    /// we can check that var rather than storing additional state
    function __assertIsActive(address _vaultProxy) private pure {
        require(_vaultProxy != address(0), "Fund not active");
    }

    function __assertIsFundDeployer(address _who) private view {
        require(_who == FUND_DEPLOYER, "Only FundDeployer callable");
    }

    function __assertIsOwner(address _who) private view {
        require(_who == IVault(vaultProxy).getOwner(), "Only fund owner callable");
    }

    function __assertLowLevelCall(bool _success, bytes memory _returnData) private pure {
        require(_success, string(_returnData));
    }

    function __assertNotPaused() private view {
        require(!__fundIsPaused(), "Fund is paused");
    }

    function __assertNotReentranceLocked() private view {
        require(!reentranceLocked, "Re-entrance");
    }

    function __assertPermissionedVaultActionNotAllowed() private view {
        require(!permissionedVaultActionAllowed, "Vault action re-entrance");
    }

    function __assertSharesActionNotTimelocked(address _account) private view {
        require(
            block.timestamp.sub(acctToLastSharesAction[_account]) >= sharesActionTimelock,
            "Shares action timelocked"
        );
    }

    constructor(
        address _dispatcher,
        address _fundDeployer,
        address _valueInterpreter,
        address _feeManager,
        address _integrationManager,
        address _policyManager,
        address _primitivePriceFeed,
        address _synthetixPriceFeed,
        address _synthetixAddressResolver
    ) public AssetFinalityResolver(_synthetixPriceFeed, _synthetixAddressResolver) {
        DISPATCHER = _dispatcher;
        FEE_MANAGER = _feeManager;
        FUND_DEPLOYER = _fundDeployer;
        INTEGRATION_MANAGER = _integrationManager;
        PRIMITIVE_PRICE_FEED = _primitivePriceFeed;
        POLICY_MANAGER = _policyManager;
        VALUE_INTERPRETER = _valueInterpreter;
        isLib = true;
    }

    /////////////
    // GENERAL //
    /////////////

    /// @notice Calls a specified action on an Extension
    /// @param _extension The Extension contract to call (e.g., FeeManager)
    /// @param _actionId An ID representing the action to take on the extension (see extension)
    /// @param _callArgs The encoded data for the call
    /// @dev Used to route arbitrary calls, so that msg.sender is the ComptrollerProxy
    /// (for access control). Uses a mutex of sorts that allows "permissioned vault actions"
    /// during calls originating from this function.
    function callOnExtension(
        address _extension,
        uint256 _actionId,
        bytes calldata _callArgs
    ) external override onlyNotPaused onlyActive locksReentrance allowsPermissionedVaultAction {
        require(
            _extension == FEE_MANAGER || _extension == INTEGRATION_MANAGER,
            "callOnExtension: _extension invalid"
        );

        IExtension(_extension).receiveCallFromComptroller(msg.sender, _actionId, _callArgs);
    }

    /// @notice Sets or unsets an override on a release-wide pause
    /// @param _nextOverridePause True if the pause should be overrode
    function setOverridePause(bool _nextOverridePause) external onlyOwner {
        require(_nextOverridePause != overridePause, "setOverridePause: Value already set");

        overridePause = _nextOverridePause;

        emit OverridePauseSet(_nextOverridePause);
    }

    /// @notice Makes an arbitrary call with the VaultProxy contract as the sender
    /// @param _contract The contract to call
    /// @param _selector The selector to call
    /// @param _encodedArgs The encoded arguments for the call
    function vaultCallOnContract(
        address _contract,
        bytes4 _selector,
        bytes calldata _encodedArgs
    ) external onlyNotPaused onlyActive onlyOwner {
        require(
            IFundDeployer(FUND_DEPLOYER).isRegisteredVaultCall(_contract, _selector),
            "vaultCallOnContract: Unregistered"
        );

        IVault(vaultProxy).callOnContract(_contract, abi.encodePacked(_selector, _encodedArgs));
    }

    /// @dev Helper to check whether the release is paused, and that there is no local override
    function __fundIsPaused() private view returns (bool) {
        return
            IFundDeployer(FUND_DEPLOYER).getReleaseStatus() ==
            IFundDeployer.ReleaseStatus.Paused &&
            !overridePause;
    }

    ////////////////////////////////
    // PERMISSIONED VAULT ACTIONS //
    ////////////////////////////////

    /// @notice Makes a permissioned, state-changing call on the VaultProxy contract
    /// @param _action The enum representing the VaultAction to perform on the VaultProxy
    /// @param _actionData The call data for the action to perform
    function permissionedVaultAction(VaultAction _action, bytes calldata _actionData)
        external
        override
        onlyNotPaused
        onlyActive
    {
        __assertPermissionedVaultAction(msg.sender, _action);

        if (_action == VaultAction.AddTrackedAsset) {
            __vaultActionAddTrackedAsset(_actionData);
        } else if (_action == VaultAction.ApproveAssetSpender) {
            __vaultActionApproveAssetSpender(_actionData);
        } else if (_action == VaultAction.BurnShares) {
            __vaultActionBurnShares(_actionData);
        } else if (_action == VaultAction.MintShares) {
            __vaultActionMintShares(_actionData);
        } else if (_action == VaultAction.RemoveTrackedAsset) {
            __vaultActionRemoveTrackedAsset(_actionData);
        } else if (_action == VaultAction.TransferShares) {
            __vaultActionTransferShares(_actionData);
        } else if (_action == VaultAction.WithdrawAssetTo) {
            __vaultActionWithdrawAssetTo(_actionData);
        }
    }

    /// @dev Helper to assert that a caller is allowed to perform a particular VaultAction
    function __assertPermissionedVaultAction(address _caller, VaultAction _action) private view {
        require(
            permissionedVaultActionAllowed,
            "__assertPermissionedVaultAction: No action allowed"
        );

        if (_caller == INTEGRATION_MANAGER) {
            require(
                _action == VaultAction.ApproveAssetSpender ||
                    _action == VaultAction.AddTrackedAsset ||
                    _action == VaultAction.RemoveTrackedAsset ||
                    _action == VaultAction.WithdrawAssetTo,
                "__assertPermissionedVaultAction: Not valid for IntegrationManager"
            );
        } else if (_caller == FEE_MANAGER) {
            require(
                _action == VaultAction.BurnShares ||
                    _action == VaultAction.MintShares ||
                    _action == VaultAction.TransferShares,
                "__assertPermissionedVaultAction: Not valid for FeeManager"
            );
        } else {
            revert("__assertPermissionedVaultAction: Not a valid actor");
        }
    }

    /// @dev Helper to add a tracked asset to the fund
    function __vaultActionAddTrackedAsset(bytes memory _actionData) private {
        address asset = abi.decode(_actionData, (address));
        IVault(vaultProxy).addTrackedAsset(asset);
    }

    /// @dev Helper to grant a spender an allowance for a fund's asset
    function __vaultActionApproveAssetSpender(bytes memory _actionData) private {
        (address asset, address target, uint256 amount) = abi.decode(
            _actionData,
            (address, address, uint256)
        );
        IVault(vaultProxy).approveAssetSpender(asset, target, amount);
    }

    /// @dev Helper to burn fund shares for a particular account
    function __vaultActionBurnShares(bytes memory _actionData) private {
        (address target, uint256 amount) = abi.decode(_actionData, (address, uint256));
        IVault(vaultProxy).burnShares(target, amount);
    }

    /// @dev Helper to mint fund shares to a particular account
    function __vaultActionMintShares(bytes memory _actionData) private {
        (address target, uint256 amount) = abi.decode(_actionData, (address, uint256));
        IVault(vaultProxy).mintShares(target, amount);
    }

    /// @dev Helper to remove a tracked asset from the fund
    function __vaultActionRemoveTrackedAsset(bytes memory _actionData) private {
        address asset = abi.decode(_actionData, (address));

        // Allowing this to fail silently makes it cheaper and simpler
        // for Extensions to not query for the denomination asset
        if (asset != denominationAsset) {
            IVault(vaultProxy).removeTrackedAsset(asset);
        }
    }

    /// @dev Helper to transfer fund shares from one account to another
    function __vaultActionTransferShares(bytes memory _actionData) private {
        (address from, address to, uint256 amount) = abi.decode(
            _actionData,
            (address, address, uint256)
        );
        IVault(vaultProxy).transferShares(from, to, amount);
    }

    /// @dev Helper to withdraw an asset from the VaultProxy to a given account
    function __vaultActionWithdrawAssetTo(bytes memory _actionData) private {
        (address asset, address target, uint256 amount) = abi.decode(
            _actionData,
            (address, address, uint256)
        );
        IVault(vaultProxy).withdrawAssetTo(asset, target, amount);
    }

    ///////////////
    // LIFECYCLE //
    ///////////////

    /// @notice Initializes a fund with its core config
    /// @param _denominationAsset The asset in which the fund's value should be denominated
    /// @param _sharesActionTimelock The minimum number of seconds between any two "shares actions"
    /// (buying or selling shares) by the same user
    /// @dev Pseudo-constructor per proxy.
    /// No need to assert access because this is called atomically on deployment,
    /// and once it's called, it cannot be called again.
    function init(address _denominationAsset, uint256 _sharesActionTimelock) external override {
        require(denominationAsset == address(0), "init: Already initialized");
        require(
            IPrimitivePriceFeed(PRIMITIVE_PRICE_FEED).isSupportedAsset(_denominationAsset),
            "init: Bad denomination asset"
        );

        denominationAsset = _denominationAsset;
        sharesActionTimelock = _sharesActionTimelock;
    }

    /// @notice Configure the extensions of a fund
    /// @param _feeManagerConfigData Encoded config for fees to enable
    /// @param _policyManagerConfigData Encoded config for policies to enable
    /// @dev No need to assert anything beyond FundDeployer access.
    /// Called atomically with init(), but after ComptrollerLib has been deployed,
    /// giving access to its state and interface
    function configureExtensions(
        bytes calldata _feeManagerConfigData,
        bytes calldata _policyManagerConfigData
    ) external override onlyFundDeployer {
        if (_feeManagerConfigData.length > 0) {
            IExtension(FEE_MANAGER).setConfigForFund(_feeManagerConfigData);
        }
        if (_policyManagerConfigData.length > 0) {
            IExtension(POLICY_MANAGER).setConfigForFund(_policyManagerConfigData);
        }
    }

    /// @notice Activates the fund by attaching a VaultProxy and activating all Extensions
    /// @param _vaultProxy The VaultProxy to attach to the fund
    /// @param _isMigration True if a migrated fund is being activated
    /// @dev No need to assert anything beyond FundDeployer access.
    function activate(address _vaultProxy, bool _isMigration) external override onlyFundDeployer {
        vaultProxy = _vaultProxy;

        emit VaultProxySet(_vaultProxy);

        if (_isMigration) {
            // Distribute any shares in the VaultProxy to the fund owner.
            // This is a mechanism to ensure that even in the edge case of a fund being unable
            // to payout fee shares owed during migration, these shares are not lost.
            uint256 sharesDue = ERC20(_vaultProxy).balanceOf(_vaultProxy);
            if (sharesDue > 0) {
                IVault(_vaultProxy).transferShares(
                    _vaultProxy,
                    IVault(_vaultProxy).getOwner(),
                    sharesDue
                );

                emit MigratedSharesDuePaid(sharesDue);
            }
        }

        // Note: a future release could consider forcing the adding of a tracked asset here,
        // just in case a fund is migrating from an old configuration where they are not able
        // to remove an asset to get under the tracked assets limit
        IVault(_vaultProxy).addTrackedAsset(denominationAsset);

        // Activate extensions
        IExtension(FEE_MANAGER).activateForFund(_isMigration);
        IExtension(INTEGRATION_MANAGER).activateForFund(_isMigration);
        IExtension(POLICY_MANAGER).activateForFund(_isMigration);
    }

    /// @notice Remove the config for a fund
    /// @dev No need to assert anything beyond FundDeployer access.
    /// Calling onlyNotPaused here rather than in the FundDeployer allows
    /// the owner to potentially override the pause and rescue unpaid fees.
    function destruct()
        external
        override
        onlyFundDeployer
        onlyNotPaused
        allowsPermissionedVaultAction
    {
        // Failsafe to protect the libs against selfdestruct
        require(!isLib, "destruct: Only delegate callable");

        // Deactivate the extensions
        IExtension(FEE_MANAGER).deactivateForFund();
        IExtension(INTEGRATION_MANAGER).deactivateForFund();
        IExtension(POLICY_MANAGER).deactivateForFund();

        // Delete storage of ComptrollerProxy
        // There should never be ETH in the ComptrollerLib, so no need to waste gas
        // to get the fund owner
        selfdestruct(address(0));
    }

    ////////////////
    // ACCOUNTING //
    ////////////////

    /// @notice Calculates the gross asset value (GAV) of the fund
    /// @param _requireFinality True if all assets must have exact final balances settled
    /// @return gav_ The fund GAV
    /// @return isValid_ True if the conversion rates used to derive the GAV are all valid
    function calcGav(bool _requireFinality) public override returns (uint256 gav_, bool isValid_) {
        address vaultProxyAddress = vaultProxy;
        address[] memory assets = IVault(vaultProxyAddress).getTrackedAssets();
        if (assets.length == 0) {
            return (0, true);
        }

        uint256[] memory balances = new uint256[](assets.length);
        for (uint256 i; i < assets.length; i++) {
            balances[i] = __finalizeIfSynthAndGetAssetBalance(
                vaultProxyAddress,
                assets[i],
                _requireFinality
            );
        }

        (gav_, isValid_) = IValueInterpreter(VALUE_INTERPRETER).calcCanonicalAssetsTotalValue(
            assets,
            balances,
            denominationAsset
        );

        return (gav_, isValid_);
    }

    /// @notice Calculates the gross value of 1 unit of shares in the fund's denomination asset
    /// @param _requireFinality True if all assets must have exact final balances settled
    /// @return grossShareValue_ The amount of the denomination asset per share
    /// @return isValid_ True if the conversion rates to derive the value are all valid
    /// @dev Does not account for any fees outstanding.
    function calcGrossShareValue(bool _requireFinality)
        external
        override
        returns (uint256 grossShareValue_, bool isValid_)
    {
        uint256 gav;
        (gav, isValid_) = calcGav(_requireFinality);

        grossShareValue_ = __calcGrossShareValue(
            gav,
            ERC20(vaultProxy).totalSupply(),
            10**uint256(ERC20(denominationAsset).decimals())
        );

        return (grossShareValue_, isValid_);
    }

    /// @dev Helper for calculating the gross share value
    function __calcGrossShareValue(
        uint256 _gav,
        uint256 _sharesSupply,
        uint256 _denominationAssetUnit
    ) private pure returns (uint256 grossShareValue_) {
        if (_sharesSupply == 0) {
            return _denominationAssetUnit;
        }

        return _gav.mul(SHARES_UNIT).div(_sharesSupply);
    }

    ///////////////////
    // PARTICIPATION //
    ///////////////////

    // BUY SHARES

    /// @notice Buys shares in the fund for multiple sets of criteria
    /// @param _buyers The accounts for which to buy shares
    /// @param _investmentAmounts The amounts of the fund's denomination asset
    /// with which to buy shares for the corresponding _buyers
    /// @param _minSharesQuantities The minimum quantities of shares to buy
    /// with the corresponding _investmentAmounts
    /// @return sharesReceivedAmounts_ The actual amounts of shares received
    /// by the corresponding _buyers
    /// @dev Param arrays have indexes corresponding to individual __buyShares() orders.
    function buyShares(
        address[] calldata _buyers,
        uint256[] calldata _investmentAmounts,
        uint256[] calldata _minSharesQuantities
    )
        external
        onlyNotPaused
        locksReentrance
        allowsPermissionedVaultAction
        returns (uint256[] memory sharesReceivedAmounts_)
    {
        require(_buyers.length > 0, "buyShares: Empty _buyers");
        require(
            _buyers.length == _investmentAmounts.length &&
                _buyers.length == _minSharesQuantities.length,
            "buyShares: Unequal arrays"
        );

        address vaultProxyCopy = vaultProxy;
        __assertIsActive(vaultProxyCopy);
        require(
            !IDispatcher(DISPATCHER).hasMigrationRequest(vaultProxyCopy),
            "buyShares: Pending migration"
        );

        (uint256 gav, bool gavIsValid) = calcGav(true);
        require(gavIsValid, "buyShares: Invalid GAV");

        __buySharesSetupHook(msg.sender, _investmentAmounts, gav);

        address denominationAssetCopy = denominationAsset;
        uint256 sharePrice = __calcGrossShareValue(
            gav,
            ERC20(vaultProxyCopy).totalSupply(),
            10**uint256(ERC20(denominationAssetCopy).decimals())
        );

        sharesReceivedAmounts_ = new uint256[](_buyers.length);
        for (uint256 i; i < _buyers.length; i++) {
            sharesReceivedAmounts_[i] = __buyShares(
                _buyers[i],
                _investmentAmounts[i],
                _minSharesQuantities[i],
                vaultProxyCopy,
                sharePrice,
                gav,
                denominationAssetCopy
            );

            gav = gav.add(_investmentAmounts[i]);
        }

        __buySharesCompletedHook(msg.sender, sharesReceivedAmounts_, gav);

        return sharesReceivedAmounts_;
    }

    /// @dev Helper to buy shares
    function __buyShares(
        address _buyer,
        uint256 _investmentAmount,
        uint256 _minSharesQuantity,
        address _vaultProxy,
        uint256 _sharePrice,
        uint256 _preBuySharesGav,
        address _denominationAsset
    ) private timelockedSharesAction(_buyer) returns (uint256 sharesReceived_) {
        require(_investmentAmount > 0, "__buyShares: Empty _investmentAmount");

        // Gives Extensions a chance to run logic prior to the minting of bought shares
        __preBuySharesHook(_buyer, _investmentAmount, _minSharesQuantity, _preBuySharesGav);

        // Calculate the amount of shares to issue with the investment amount
        uint256 sharesIssued = _investmentAmount.mul(SHARES_UNIT).div(_sharePrice);

        // Mint shares to the buyer
        uint256 prevBuyerShares = ERC20(_vaultProxy).balanceOf(_buyer);
        IVault(_vaultProxy).mintShares(_buyer, sharesIssued);

        // Transfer the investment asset to the fund.
        // Does not follow the checks-effects-interactions pattern, but it is preferred
        // to have the final state of the VaultProxy prior to running __postBuySharesHook().
        ERC20(_denominationAsset).safeTransferFrom(msg.sender, _vaultProxy, _investmentAmount);

        // Gives Extensions a chance to run logic after shares are issued
        __postBuySharesHook(_buyer, _investmentAmount, sharesIssued, _preBuySharesGav);

        // The number of actual shares received may differ from shares issued due to
        // how the PostBuyShares hooks are invoked by Extensions (i.e., fees)
        sharesReceived_ = ERC20(_vaultProxy).balanceOf(_buyer).sub(prevBuyerShares);
        require(
            sharesReceived_ >= _minSharesQuantity,
            "__buyShares: Shares received < _minSharesQuantity"
        );

        emit SharesBought(msg.sender, _buyer, _investmentAmount, sharesIssued, sharesReceived_);

        return sharesReceived_;
    }

    /// @dev Helper for Extension actions after all __buyShares() calls are made
    function __buySharesCompletedHook(
        address _caller,
        uint256[] memory _sharesReceivedAmounts,
        uint256 _gav
    ) private {
        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.BuySharesCompleted,
            abi.encode(_caller, _sharesReceivedAmounts, _gav)
        );

        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.BuySharesCompleted,
            abi.encode(_caller, _sharesReceivedAmounts),
            _gav
        );
    }

    /// @dev Helper for Extension actions before any __buyShares() calls are made
    function __buySharesSetupHook(
        address _caller,
        uint256[] memory _investmentAmounts,
        uint256 _gav
    ) private {
        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.BuySharesSetup,
            abi.encode(_caller, _investmentAmounts, _gav)
        );

        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.BuySharesSetup,
            abi.encode(_caller, _investmentAmounts),
            _gav
        );
    }

    /// @dev Helper for Extension actions immediately prior to issuing shares.
    /// This could be cleaned up so both Extensions take the same encoded args and handle GAV
    /// in the same way, but there is not the obvious need for gas savings of recycling
    /// the GAV value for the current policies as there is for the fees.
    function __preBuySharesHook(
        address _buyer,
        uint256 _investmentAmount,
        uint256 _minSharesQuantity,
        uint256 _gav
    ) private {
        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.PreBuyShares,
            abi.encode(_buyer, _investmentAmount, _minSharesQuantity),
            _gav
        );

        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.PreBuyShares,
            abi.encode(_buyer, _investmentAmount, _minSharesQuantity, _gav)
        );
    }

    /// @dev Helper for Extension actions immediately after issuing shares.
    /// Same comment applies from __preBuySharesHook() above.
    function __postBuySharesHook(
        address _buyer,
        uint256 _investmentAmount,
        uint256 _sharesIssued,
        uint256 _preBuySharesGav
    ) private {
        uint256 gav = _preBuySharesGav.add(_investmentAmount);
        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.PostBuyShares,
            abi.encode(_buyer, _investmentAmount, _sharesIssued),
            gav
        );

        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.PostBuyShares,
            abi.encode(_buyer, _investmentAmount, _sharesIssued, gav)
        );
    }

    // REDEEM SHARES

    /// @notice Redeem all of the sender's shares for a proportionate slice of the fund's assets
    /// @return payoutAssets_ The assets paid out to the redeemer
    /// @return payoutAmounts_ The amount of each asset paid out to the redeemer
    /// @dev See __redeemShares() for further detail
    function redeemShares()
        external
        returns (address[] memory payoutAssets_, uint256[] memory payoutAmounts_)
    {
        return
            __redeemShares(
                msg.sender,
                ERC20(vaultProxy).balanceOf(msg.sender),
                new address[](0),
                new address[](0)
            );
    }

    /// @notice Redeem a specified quantity of the sender's shares for a proportionate slice of
    /// the fund's assets, optionally specifying additional assets and assets to skip.
    /// @param _sharesQuantity The quantity of shares to redeem
    /// @param _additionalAssets Additional (non-tracked) assets to claim
    /// @param _assetsToSkip Tracked assets to forfeit
    /// @return payoutAssets_ The assets paid out to the redeemer
    /// @return payoutAmounts_ The amount of each asset paid out to the redeemer
    /// @dev Any claim to passed _assetsToSkip will be forfeited entirely. This should generally
    /// only be exercised if a bad asset is causing redemption to fail.
    function redeemSharesDetailed(
        uint256 _sharesQuantity,
        address[] calldata _additionalAssets,
        address[] calldata _assetsToSkip
    ) external returns (address[] memory payoutAssets_, uint256[] memory payoutAmounts_) {
        return __redeemShares(msg.sender, _sharesQuantity, _additionalAssets, _assetsToSkip);
    }

    /// @dev Helper to parse an array of payout assets during redemption, taking into account
    /// additional assets and assets to skip. _assetsToSkip ignores _additionalAssets.
    /// All input arrays are assumed to be unique.
    function __parseRedemptionPayoutAssets(
        address[] memory _trackedAssets,
        address[] memory _additionalAssets,
        address[] memory _assetsToSkip
    ) private pure returns (address[] memory payoutAssets_) {
        address[] memory trackedAssetsToPayout = _trackedAssets.removeItems(_assetsToSkip);
        if (_additionalAssets.length == 0) {
            return trackedAssetsToPayout;
        }

        // Add additional assets. Duplicates of trackedAssets are ignored.
        bool[] memory indexesToAdd = new bool[](_additionalAssets.length);
        uint256 additionalItemsCount;
        for (uint256 i; i < _additionalAssets.length; i++) {
            if (!trackedAssetsToPayout.contains(_additionalAssets[i])) {
                indexesToAdd[i] = true;
                additionalItemsCount++;
            }
        }
        if (additionalItemsCount == 0) {
            return trackedAssetsToPayout;
        }

        payoutAssets_ = new address[](trackedAssetsToPayout.length.add(additionalItemsCount));
        for (uint256 i; i < trackedAssetsToPayout.length; i++) {
            payoutAssets_[i] = trackedAssetsToPayout[i];
        }
        uint256 payoutAssetsIndex = trackedAssetsToPayout.length;
        for (uint256 i; i < _additionalAssets.length; i++) {
            if (indexesToAdd[i]) {
                payoutAssets_[payoutAssetsIndex] = _additionalAssets[i];
                payoutAssetsIndex++;
            }
        }

        return payoutAssets_;
    }

    /// @dev Helper for system actions immediately prior to redeeming shares.
    /// Policy validation is not currently allowed on redemption, to ensure continuous redeemability.
    function __preRedeemSharesHook(address _redeemer, uint256 _sharesQuantity)
        private
        allowsPermissionedVaultAction
    {
        try
            IFeeManager(FEE_MANAGER).invokeHook(
                IFeeManager.FeeHook.PreRedeemShares,
                abi.encode(_redeemer, _sharesQuantity),
                0
            )
         {} catch (bytes memory reason) {
            emit PreRedeemSharesHookFailed(reason, _redeemer, _sharesQuantity);
        }
    }

    /// @dev Helper to redeem shares.
    /// This function should never fail without a way to bypass the failure, which is assured
    /// through two mechanisms:
    /// 1. The FeeManager is called with the try/catch pattern to assure that calls to it
    /// can never block redemption.
    /// 2. If a token fails upon transfer(), that token can be skipped (and its balance forfeited)
    /// by explicitly specifying _assetsToSkip.
    /// Because of these assurances, shares should always be redeemable, with the exception
    /// of the timelock period on shares actions that must be respected.
    function __redeemShares(
        address _redeemer,
        uint256 _sharesQuantity,
        address[] memory _additionalAssets,
        address[] memory _assetsToSkip
    )
        private
        locksReentrance
        returns (address[] memory payoutAssets_, uint256[] memory payoutAmounts_)
    {
        require(_sharesQuantity > 0, "__redeemShares: _sharesQuantity must be >0");
        require(
            _additionalAssets.isUniqueSet(),
            "__redeemShares: _additionalAssets contains duplicates"
        );
        require(_assetsToSkip.isUniqueSet(), "__redeemShares: _assetsToSkip contains duplicates");

        IVault vaultProxyContract = IVault(vaultProxy);

        // Only apply the sharesActionTimelock when a migration is not pending
        if (!IDispatcher(DISPATCHER).hasMigrationRequest(address(vaultProxyContract))) {
            __assertSharesActionNotTimelocked(_redeemer);
            acctToLastSharesAction[_redeemer] = block.timestamp;
        }

        // When a fund is paused, settling fees will be skipped
        if (!__fundIsPaused()) {
            // Note that if a fee with `SettlementType.Direct` is charged here (i.e., not `Mint`),
            // then those fee shares will be transferred from the user's balance rather
            // than reallocated from the sharesQuantity being redeemed.
            __preRedeemSharesHook(_redeemer, _sharesQuantity);
        }

        // Check the shares quantity against the user's balance after settling fees
        ERC20 sharesContract = ERC20(address(vaultProxyContract));
        require(
            _sharesQuantity <= sharesContract.balanceOf(_redeemer),
            "__redeemShares: Insufficient shares"
        );

        // Parse the payout assets given optional params to add or skip assets.
        // Note that there is no validation that the _additionalAssets are known assets to
        // the protocol. This means that the redeemer could specify a malicious asset,
        // but since all state-changing, user-callable functions on this contract share the
        // non-reentrant modifier, there is nowhere to perform a reentrancy attack.
        payoutAssets_ = __parseRedemptionPayoutAssets(
            vaultProxyContract.getTrackedAssets(),
            _additionalAssets,
            _assetsToSkip
        );
        require(payoutAssets_.length > 0, "__redeemShares: No payout assets");

        // Destroy the shares.
        // Must get the shares supply before doing so.
        uint256 sharesSupply = sharesContract.totalSupply();
        vaultProxyContract.burnShares(_redeemer, _sharesQuantity);

        // Calculate and transfer payout asset amounts due to redeemer
        payoutAmounts_ = new uint256[](payoutAssets_.length);
        address denominationAssetCopy = denominationAsset;
        for (uint256 i; i < payoutAssets_.length; i++) {
            uint256 assetBalance = __finalizeIfSynthAndGetAssetBalance(
                address(vaultProxyContract),
                payoutAssets_[i],
                true
            );

            // If all remaining shares are being redeemed, the logic changes slightly
            if (_sharesQuantity == sharesSupply) {
                payoutAmounts_[i] = assetBalance;
                // Remove every tracked asset, except the denomination asset
                if (payoutAssets_[i] != denominationAssetCopy) {
                    vaultProxyContract.removeTrackedAsset(payoutAssets_[i]);
                }
            } else {
                payoutAmounts_[i] = assetBalance.mul(_sharesQuantity).div(sharesSupply);
            }

            // Transfer payout asset to redeemer
            if (payoutAmounts_[i] > 0) {
                vaultProxyContract.withdrawAssetTo(payoutAssets_[i], _redeemer, payoutAmounts_[i]);
            }
        }

        emit SharesRedeemed(_redeemer, _sharesQuantity, payoutAssets_, payoutAmounts_);

        return (payoutAssets_, payoutAmounts_);
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `denominationAsset` variable
    /// @return denominationAsset_ The `denominationAsset` variable value
    function getDenominationAsset() external view override returns (address denominationAsset_) {
        return denominationAsset;
    }

    /// @notice Gets the routes for the various contracts used by all funds
    /// @return dispatcher_ The `DISPATCHER` variable value
    /// @return feeManager_ The `FEE_MANAGER` variable value
    /// @return fundDeployer_ The `FUND_DEPLOYER` variable value
    /// @return integrationManager_ The `INTEGRATION_MANAGER` variable value
    /// @return policyManager_ The `POLICY_MANAGER` variable value
    /// @return primitivePriceFeed_ The `PRIMITIVE_PRICE_FEED` variable value
    /// @return valueInterpreter_ The `VALUE_INTERPRETER` variable value
    function getLibRoutes()
        external
        view
        returns (
            address dispatcher_,
            address feeManager_,
            address fundDeployer_,
            address integrationManager_,
            address policyManager_,
            address primitivePriceFeed_,
            address valueInterpreter_
        )
    {
        return (
            DISPATCHER,
            FEE_MANAGER,
            FUND_DEPLOYER,
            INTEGRATION_MANAGER,
            POLICY_MANAGER,
            PRIMITIVE_PRICE_FEED,
            VALUE_INTERPRETER
        );
    }

    /// @notice Gets the `overridePause` variable
    /// @return overridePause_ The `overridePause` variable value
    function getOverridePause() external view returns (bool overridePause_) {
        return overridePause;
    }

    /// @notice Gets the `sharesActionTimelock` variable
    /// @return sharesActionTimelock_ The `sharesActionTimelock` variable value
    function getSharesActionTimelock() external view returns (uint256 sharesActionTimelock_) {
        return sharesActionTimelock;
    }

    /// @notice Gets the `vaultProxy` variable
    /// @return vaultProxy_ The `vaultProxy` variable value
    function getVaultProxy() external view override returns (address vaultProxy_) {
        return vaultProxy;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IComptroller Interface
/// @author Enzyme Council <[email protected]>
interface IComptroller {
    enum VaultAction {
        None,
        BurnShares,
        MintShares,
        TransferShares,
        ApproveAssetSpender,
        WithdrawAssetTo,
        AddTrackedAsset,
        RemoveTrackedAsset
    }

    function activate(address, bool) external;

    function calcGav(bool) external returns (uint256, bool);

    function calcGrossShareValue(bool) external returns (uint256, bool);

    function callOnExtension(
        address,
        uint256,
        bytes calldata
    ) external;

    function configureExtensions(bytes calldata, bytes calldata) external;

    function destruct() external;

    function getDenominationAsset() external view returns (address);

    function getVaultProxy() external view returns (address);

    function init(address, uint256) external;

    function permissionedVaultAction(VaultAction, bytes calldata) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../../persistent/utils/IMigratableVault.sol";

/// @title IVault Interface
/// @author Enzyme Council <[email protected]>
interface IVault is IMigratableVault {
    function addTrackedAsset(address) external;

    function approveAssetSpender(
        address,
        address,
        uint256
    ) external;

    function burnShares(address, uint256) external;

    function callOnContract(address, bytes calldata) external;

    function getAccessor() external view returns (address);

    function getOwner() external view returns (address);

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

    function isTrackedAsset(address) external view returns (bool);

    function mintShares(address, uint256) external;

    function removeTrackedAsset(address) external;

    function transferShares(
        address,
        address,
        uint256
    ) external;

    function withdrawAssetTo(
        address,
        address,
        uint256
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IExtension Interface
/// @author Enzyme Council <[email protected]>
/// @notice Interface for all extensions
interface IExtension {
    function activateForFund(bool _isMigration) external;

    function deactivateForFund() external;

    function receiveCallFromComptroller(
        address _comptrollerProxy,
        uint256 _actionId,
        bytes calldata _callArgs
    ) external;

    function setConfigForFund(bytes calldata _configData) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "../../core/fund/comptroller/IComptroller.sol";
import "../../core/fund/vault/IVault.sol";
import "../../utils/AddressArrayLib.sol";
import "../utils/ExtensionBase.sol";
import "../utils/FundDeployerOwnerMixin.sol";
import "../utils/PermissionedVaultActionMixin.sol";
import "./IFee.sol";
import "./IFeeManager.sol";

/// @title FeeManager Contract
/// @author Enzyme Council <[email protected]>
/// @notice Manages fees for funds
contract FeeManager is
    IFeeManager,
    ExtensionBase,
    FundDeployerOwnerMixin,
    PermissionedVaultActionMixin
{
    using AddressArrayLib for address[];
    using EnumerableSet for EnumerableSet.AddressSet;
    using SafeMath for uint256;

    event AllSharesOutstandingForcePaidForFund(
        address indexed comptrollerProxy,
        address payee,
        uint256 sharesDue
    );

    event FeeDeregistered(address indexed fee, string indexed identifier);

    event FeeEnabledForFund(
        address indexed comptrollerProxy,
        address indexed fee,
        bytes settingsData
    );

    event FeeRegistered(
        address indexed fee,
        string indexed identifier,
        FeeHook[] implementedHooksForSettle,
        FeeHook[] implementedHooksForUpdate,
        bool usesGavOnSettle,
        bool usesGavOnUpdate
    );

    event FeeSettledForFund(
        address indexed comptrollerProxy,
        address indexed fee,
        SettlementType indexed settlementType,
        address payer,
        address payee,
        uint256 sharesDue
    );

    event SharesOutstandingPaidForFund(
        address indexed comptrollerProxy,
        address indexed fee,
        uint256 sharesDue
    );

    event FeesRecipientSetForFund(
        address indexed comptrollerProxy,
        address prevFeesRecipient,
        address nextFeesRecipient
    );

    EnumerableSet.AddressSet private registeredFees;
    mapping(address => bool) private feeToUsesGavOnSettle;
    mapping(address => bool) private feeToUsesGavOnUpdate;
    mapping(address => mapping(FeeHook => bool)) private feeToHookToImplementsSettle;
    mapping(address => mapping(FeeHook => bool)) private feeToHookToImplementsUpdate;

    mapping(address => address[]) private comptrollerProxyToFees;
    mapping(address => mapping(address => uint256))
        private comptrollerProxyToFeeToSharesOutstanding;

    constructor(address _fundDeployer) public FundDeployerOwnerMixin(_fundDeployer) {}

    // EXTERNAL FUNCTIONS

    /// @notice Activate already-configured fees for use in the calling fund
    function activateForFund(bool) external override {
        address vaultProxy = __setValidatedVaultProxy(msg.sender);

        address[] memory enabledFees = comptrollerProxyToFees[msg.sender];
        for (uint256 i; i < enabledFees.length; i++) {
            IFee(enabledFees[i]).activateForFund(msg.sender, vaultProxy);
        }
    }

    /// @notice Deactivate fees for a fund
    /// @dev msg.sender is validated during __invokeHook()
    function deactivateForFund() external override {
        // Settle continuous fees one last time, but without calling Fee.update()
        __invokeHook(msg.sender, IFeeManager.FeeHook.Continuous, "", 0, false);

        // Force payout of remaining shares outstanding
        __forcePayoutAllSharesOutstanding(msg.sender);

        // Clean up storage
        __deleteFundStorage(msg.sender);
    }

    /// @notice Receives a dispatched `callOnExtension` from a fund's ComptrollerProxy
    /// @param _actionId An ID representing the desired action
    /// @param _callArgs Encoded arguments specific to the _actionId
    /// @dev This is the only way to call a function on this contract that updates VaultProxy state.
    /// For both of these actions, any caller is allowed, so we don't use the caller param.
    function receiveCallFromComptroller(
        address,
        uint256 _actionId,
        bytes calldata _callArgs
    ) external override {
        if (_actionId == 0) {
            // Settle and update all continuous fees
            __invokeHook(msg.sender, IFeeManager.FeeHook.Continuous, "", 0, true);
        } else if (_actionId == 1) {
            __payoutSharesOutstandingForFees(msg.sender, _callArgs);
        } else {
            revert("receiveCallFromComptroller: Invalid _actionId");
        }
    }

    /// @notice Enable and configure fees for use in the calling fund
    /// @param _configData Encoded config data
    /// @dev Caller is expected to be a valid ComptrollerProxy, but there isn't a need to validate.
    /// The order of `fees` determines the order in which fees of the same FeeHook will be applied.
    /// It is recommended to run ManagementFee before PerformanceFee in order to achieve precise
    /// PerformanceFee calcs.
    function setConfigForFund(bytes calldata _configData) external override {
        (address[] memory fees, bytes[] memory settingsData) = abi.decode(
            _configData,
            (address[], bytes[])
        );

        // Sanity checks
        require(
            fees.length == settingsData.length,
            "setConfigForFund: fees and settingsData array lengths unequal"
        );
        require(fees.isUniqueSet(), "setConfigForFund: fees cannot include duplicates");

        // Enable each fee with settings
        for (uint256 i; i < fees.length; i++) {
            require(isRegisteredFee(fees[i]), "setConfigForFund: Fee is not registered");

            // Set fund config on fee
            IFee(fees[i]).addFundSettings(msg.sender, settingsData[i]);

            // Enable fee for fund
            comptrollerProxyToFees[msg.sender].push(fees[i]);

            emit FeeEnabledForFund(msg.sender, fees[i], settingsData[i]);
        }
    }

    /// @notice Allows all fees for a particular FeeHook to implement settle() and update() logic
    /// @param _hook The FeeHook to invoke
    /// @param _settlementData The encoded settlement parameters specific to the FeeHook
    /// @param _gav The GAV for a fund if known in the invocating code, otherwise 0
    function invokeHook(
        FeeHook _hook,
        bytes calldata _settlementData,
        uint256 _gav
    ) external override {
        __invokeHook(msg.sender, _hook, _settlementData, _gav, true);
    }

    // PRIVATE FUNCTIONS

    /// @dev Helper to destroy local storage to get gas refund,
    /// and to prevent further calls to fee manager
    function __deleteFundStorage(address _comptrollerProxy) private {
        delete comptrollerProxyToFees[_comptrollerProxy];
        delete comptrollerProxyToVaultProxy[_comptrollerProxy];
    }

    /// @dev Helper to force the payout of shares outstanding across all fees.
    /// For the current release, all shares in the VaultProxy are assumed to be
    /// shares outstanding from fees. If not, then they were sent there by mistake
    /// and are otherwise unrecoverable. We can therefore take the VaultProxy's
    /// shares balance as the totalSharesOutstanding to payout to the fund owner.
    function __forcePayoutAllSharesOutstanding(address _comptrollerProxy) private {
        address vaultProxy = getVaultProxyForFund(_comptrollerProxy);

        uint256 totalSharesOutstanding = ERC20(vaultProxy).balanceOf(vaultProxy);
        if (totalSharesOutstanding == 0) {
            return;
        }

        // Destroy any shares outstanding storage
        address[] memory fees = comptrollerProxyToFees[_comptrollerProxy];
        for (uint256 i; i < fees.length; i++) {
            delete comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][fees[i]];
        }

        // Distribute all shares outstanding to the fees recipient
        address payee = IVault(vaultProxy).getOwner();
        __transferShares(_comptrollerProxy, vaultProxy, payee, totalSharesOutstanding);

        emit AllSharesOutstandingForcePaidForFund(
            _comptrollerProxy,
            payee,
            totalSharesOutstanding
        );
    }

    /// @dev Helper to get the canonical value of GAV if not yet set and required by fee
    function __getGavAsNecessary(
        address _comptrollerProxy,
        address _fee,
        uint256 _gavOrZero
    ) private returns (uint256 gav_) {
        if (_gavOrZero == 0 && feeUsesGavOnUpdate(_fee)) {
            // Assumes that any fee that requires GAV would need to revert if invalid or not final
            bool gavIsValid;
            (gav_, gavIsValid) = IComptroller(_comptrollerProxy).calcGav(true);
            require(gavIsValid, "__getGavAsNecessary: Invalid GAV");
        } else {
            gav_ = _gavOrZero;
        }

        return gav_;
    }

    /// @dev Helper to run settle() on all enabled fees for a fund that implement a given hook, and then to
    /// optionally run update() on the same fees. This order allows fees an opportunity to update
    /// their local state after all VaultProxy state transitions (i.e., minting, burning,
    /// transferring shares) have finished. To optimize for the expensive operation of calculating
    /// GAV, once one fee requires GAV, we recycle that `gav` value for subsequent fees.
    /// Assumes that _gav is either 0 or has already been validated.
    function __invokeHook(
        address _comptrollerProxy,
        FeeHook _hook,
        bytes memory _settlementData,
        uint256 _gavOrZero,
        bool _updateFees
    ) private {
        address[] memory fees = comptrollerProxyToFees[_comptrollerProxy];
        if (fees.length == 0) {
            return;
        }

        address vaultProxy = getVaultProxyForFund(_comptrollerProxy);

        // This check isn't strictly necessary, but its cost is insignificant,
        // and helps to preserve data integrity.
        require(vaultProxy != address(0), "__invokeHook: Fund is not active");

        // First, allow all fees to implement settle()
        uint256 gav = __settleFees(
            _comptrollerProxy,
            vaultProxy,
            fees,
            _hook,
            _settlementData,
            _gavOrZero
        );

        // Second, allow fees to implement update()
        // This function does not allow any further altering of VaultProxy state
        // (i.e., burning, minting, or transferring shares)
        if (_updateFees) {
            __updateFees(_comptrollerProxy, vaultProxy, fees, _hook, _settlementData, gav);
        }
    }

    /// @dev Helper to payout the shares outstanding for the specified fees.
    /// Does not call settle() on fees.
    /// Only callable via ComptrollerProxy.callOnExtension().
    function __payoutSharesOutstandingForFees(address _comptrollerProxy, bytes memory _callArgs)
        private
    {
        address[] memory fees = abi.decode(_callArgs, (address[]));
        address vaultProxy = getVaultProxyForFund(msg.sender);

        uint256 sharesOutstandingDue;
        for (uint256 i; i < fees.length; i++) {
            if (!IFee(fees[i]).payout(_comptrollerProxy, vaultProxy)) {
                continue;
            }


                uint256 sharesOutstandingForFee
             = comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][fees[i]];
            if (sharesOutstandingForFee == 0) {
                continue;
            }

            sharesOutstandingDue = sharesOutstandingDue.add(sharesOutstandingForFee);

            // Delete shares outstanding and distribute from VaultProxy to the fees recipient
            comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][fees[i]] = 0;

            emit SharesOutstandingPaidForFund(_comptrollerProxy, fees[i], sharesOutstandingForFee);
        }

        if (sharesOutstandingDue > 0) {
            __transferShares(
                _comptrollerProxy,
                vaultProxy,
                IVault(vaultProxy).getOwner(),
                sharesOutstandingDue
            );
        }
    }

    /// @dev Helper to settle a fee
    function __settleFee(
        address _comptrollerProxy,
        address _vaultProxy,
        address _fee,
        FeeHook _hook,
        bytes memory _settlementData,
        uint256 _gav
    ) private {
        (SettlementType settlementType, address payer, uint256 sharesDue) = IFee(_fee).settle(
            _comptrollerProxy,
            _vaultProxy,
            _hook,
            _settlementData,
            _gav
        );
        if (settlementType == SettlementType.None) {
            return;
        }

        address payee;
        if (settlementType == SettlementType.Direct) {
            payee = IVault(_vaultProxy).getOwner();
            __transferShares(_comptrollerProxy, payer, payee, sharesDue);
        } else if (settlementType == SettlementType.Mint) {
            payee = IVault(_vaultProxy).getOwner();
            __mintShares(_comptrollerProxy, payee, sharesDue);
        } else if (settlementType == SettlementType.Burn) {
            __burnShares(_comptrollerProxy, payer, sharesDue);
        } else if (settlementType == SettlementType.MintSharesOutstanding) {
            comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][_fee] = comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][_fee]
                .add(sharesDue);

            payee = _vaultProxy;
            __mintShares(_comptrollerProxy, payee, sharesDue);
        } else if (settlementType == SettlementType.BurnSharesOutstanding) {
            comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][_fee] = comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][_fee]
                .sub(sharesDue);

            payer = _vaultProxy;
            __burnShares(_comptrollerProxy, payer, sharesDue);
        } else {
            revert("__settleFee: Invalid SettlementType");
        }

        emit FeeSettledForFund(_comptrollerProxy, _fee, settlementType, payer, payee, sharesDue);
    }

    /// @dev Helper to settle fees that implement a given fee hook
    function __settleFees(
        address _comptrollerProxy,
        address _vaultProxy,
        address[] memory _fees,
        FeeHook _hook,
        bytes memory _settlementData,
        uint256 _gavOrZero
    ) private returns (uint256 gav_) {
        gav_ = _gavOrZero;

        for (uint256 i; i < _fees.length; i++) {
            if (!feeSettlesOnHook(_fees[i], _hook)) {
                continue;
            }

            gav_ = __getGavAsNecessary(_comptrollerProxy, _fees[i], gav_);

            __settleFee(_comptrollerProxy, _vaultProxy, _fees[i], _hook, _settlementData, gav_);
        }

        return gav_;
    }

    /// @dev Helper to update fees that implement a given fee hook
    function __updateFees(
        address _comptrollerProxy,
        address _vaultProxy,
        address[] memory _fees,
        FeeHook _hook,
        bytes memory _settlementData,
        uint256 _gavOrZero
    ) private {
        uint256 gav = _gavOrZero;

        for (uint256 i; i < _fees.length; i++) {
            if (!feeUpdatesOnHook(_fees[i], _hook)) {
                continue;
            }

            gav = __getGavAsNecessary(_comptrollerProxy, _fees[i], gav);

            IFee(_fees[i]).update(_comptrollerProxy, _vaultProxy, _hook, _settlementData, gav);
        }
    }

    ///////////////////
    // FEES REGISTRY //
    ///////////////////

    /// @notice Remove fees from the list of registered fees
    /// @param _fees Addresses of fees to be deregistered
    function deregisterFees(address[] calldata _fees) external onlyFundDeployerOwner {
        require(_fees.length > 0, "deregisterFees: _fees cannot be empty");

        for (uint256 i; i < _fees.length; i++) {
            require(isRegisteredFee(_fees[i]), "deregisterFees: fee is not registered");

            registeredFees.remove(_fees[i]);

            emit FeeDeregistered(_fees[i], IFee(_fees[i]).identifier());
        }
    }

    /// @notice Add fees to the list of registered fees
    /// @param _fees Addresses of fees to be registered
    /// @dev Stores the hooks that a fee implements and whether each implementation uses GAV,
    /// which fronts the gas for calls to check if a hook is implemented, and guarantees
    /// that these hook implementation return values do not change post-registration.
    function registerFees(address[] calldata _fees) external onlyFundDeployerOwner {
        require(_fees.length > 0, "registerFees: _fees cannot be empty");

        for (uint256 i; i < _fees.length; i++) {
            require(!isRegisteredFee(_fees[i]), "registerFees: fee already registered");

            registeredFees.add(_fees[i]);

            IFee feeContract = IFee(_fees[i]);
            (
                FeeHook[] memory implementedHooksForSettle,
                FeeHook[] memory implementedHooksForUpdate,
                bool usesGavOnSettle,
                bool usesGavOnUpdate
            ) = feeContract.implementedHooks();

            // Stores the hooks for which each fee implements settle() and update()
            for (uint256 j; j < implementedHooksForSettle.length; j++) {
                feeToHookToImplementsSettle[_fees[i]][implementedHooksForSettle[j]] = true;
            }
            for (uint256 j; j < implementedHooksForUpdate.length; j++) {
                feeToHookToImplementsUpdate[_fees[i]][implementedHooksForUpdate[j]] = true;
            }

            // Stores whether each fee requires GAV during its implementations for settle() and update()
            if (usesGavOnSettle) {
                feeToUsesGavOnSettle[_fees[i]] = true;
            }
            if (usesGavOnUpdate) {
                feeToUsesGavOnUpdate[_fees[i]] = true;
            }

            emit FeeRegistered(
                _fees[i],
                feeContract.identifier(),
                implementedHooksForSettle,
                implementedHooksForUpdate,
                usesGavOnSettle,
                usesGavOnUpdate
            );
        }
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Get a list of enabled fees for a given fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @return enabledFees_ An array of enabled fee addresses
    function getEnabledFeesForFund(address _comptrollerProxy)
        external
        view
        returns (address[] memory enabledFees_)
    {
        return comptrollerProxyToFees[_comptrollerProxy];
    }

    /// @notice Get the amount of shares outstanding for a particular fee for a fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _fee The fee address
    /// @return sharesOutstanding_ The amount of shares outstanding
    function getFeeSharesOutstandingForFund(address _comptrollerProxy, address _fee)
        external
        view
        returns (uint256 sharesOutstanding_)
    {
        return comptrollerProxyToFeeToSharesOutstanding[_comptrollerProxy][_fee];
    }

    /// @notice Get all registered fees
    /// @return registeredFees_ A list of all registered fee addresses
    function getRegisteredFees() external view returns (address[] memory registeredFees_) {
        registeredFees_ = new address[](registeredFees.length());
        for (uint256 i; i < registeredFees_.length; i++) {
            registeredFees_[i] = registeredFees.at(i);
        }

        return registeredFees_;
    }

    /// @notice Checks if a fee implements settle() on a particular hook
    /// @param _fee The address of the fee to check
    /// @param _hook The FeeHook to check
    /// @return settlesOnHook_ True if the fee settles on the given hook
    function feeSettlesOnHook(address _fee, FeeHook _hook)
        public
        view
        returns (bool settlesOnHook_)
    {
        return feeToHookToImplementsSettle[_fee][_hook];
    }

    /// @notice Checks if a fee implements update() on a particular hook
    /// @param _fee The address of the fee to check
    /// @param _hook The FeeHook to check
    /// @return updatesOnHook_ True if the fee updates on the given hook
    function feeUpdatesOnHook(address _fee, FeeHook _hook)
        public
        view
        returns (bool updatesOnHook_)
    {
        return feeToHookToImplementsUpdate[_fee][_hook];
    }

    /// @notice Checks if a fee uses GAV in its settle() implementation
    /// @param _fee The address of the fee to check
    /// @return usesGav_ True if the fee uses GAV during settle() implementation
    function feeUsesGavOnSettle(address _fee) public view returns (bool usesGav_) {
        return feeToUsesGavOnSettle[_fee];
    }

    /// @notice Checks if a fee uses GAV in its update() implementation
    /// @param _fee The address of the fee to check
    /// @return usesGav_ True if the fee uses GAV during update() implementation
    function feeUsesGavOnUpdate(address _fee) public view returns (bool usesGav_) {
        return feeToUsesGavOnUpdate[_fee];
    }

    /// @notice Check whether a fee is registered
    /// @param _fee The address of the fee to check
    /// @return isRegisteredFee_ True if the fee is registered
    function isRegisteredFee(address _fee) public view returns (bool isRegisteredFee_) {
        return registeredFees.contains(_fee);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "./IFeeManager.sol";

/// @title Fee Interface
/// @author Enzyme Council <[email protected]>
/// @notice Interface for all fees
interface IFee {
    function activateForFund(address _comptrollerProxy, address _vaultProxy) external;

    function addFundSettings(address _comptrollerProxy, bytes calldata _settingsData) external;

    function identifier() external pure returns (string memory identifier_);

    function implementedHooks()
        external
        view
        returns (
            IFeeManager.FeeHook[] memory implementedHooksForSettle_,
            IFeeManager.FeeHook[] memory implementedHooksForUpdate_,
            bool usesGavOnSettle_,
            bool usesGavOnUpdate_
        );

    function payout(address _comptrollerProxy, address _vaultProxy)
        external
        returns (bool isPayable_);

    function settle(
        address _comptrollerProxy,
        address _vaultProxy,
        IFeeManager.FeeHook _hook,
        bytes calldata _settlementData,
        uint256 _gav
    )
        external
        returns (
            IFeeManager.SettlementType settlementType_,
            address payer_,
            uint256 sharesDue_
        );

    function update(
        address _comptrollerProxy,
        address _vaultProxy,
        IFeeManager.FeeHook _hook,
        bytes calldata _settlementData,
        uint256 _gav
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

/// @title FeeManager Interface
/// @author Enzyme Council <[email protected]>
/// @notice Interface for the FeeManager
interface IFeeManager {
    // No fees for the current release are implemented post-redeemShares
    enum FeeHook {
        Continuous,
        BuySharesSetup,
        PreBuyShares,
        PostBuyShares,
        BuySharesCompleted,
        PreRedeemShares
    }
    enum SettlementType {None, Direct, Mint, Burn, MintSharesOutstanding, BurnSharesOutstanding}

    function invokeHook(
        FeeHook,
        bytes calldata,
        uint256
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../IFee.sol";

/// @title FeeBase Contract
/// @author Enzyme Council <[email protected]>
/// @notice Abstract base contract for all fees
abstract contract FeeBase is IFee {
    address internal immutable FEE_MANAGER;

    modifier onlyFeeManager {
        require(msg.sender == FEE_MANAGER, "Only the FeeManger can make this call");
        _;
    }

    constructor(address _feeManager) public {
        FEE_MANAGER = _feeManager;
    }

    /// @notice Allows Fee to run logic during fund activation
    /// @dev Unimplemented by default, may be overrode.
    function activateForFund(address, address) external virtual override {
        return;
    }

    /// @notice Runs payout logic for a fee that utilizes shares outstanding as its settlement type
    /// @dev Returns false by default, can be overridden by fee
    function payout(address, address) external virtual override returns (bool) {
        return false;
    }

    /// @notice Update fee state after all settlement has occurred during a given fee hook
    /// @dev Unimplemented by default, can be overridden by fee
    function update(
        address,
        address,
        IFeeManager.FeeHook,
        bytes calldata,
        uint256
    ) external virtual override {
        return;
    }

    /// @notice Helper to parse settlement arguments from encoded data for PreBuyShares fee hook
    function __decodePreBuySharesSettlementData(bytes memory _settlementData)
        internal
        pure
        returns (
            address buyer_,
            uint256 investmentAmount_,
            uint256 minSharesQuantity_
        )
    {
        return abi.decode(_settlementData, (address, uint256, uint256));
    }

    /// @notice Helper to parse settlement arguments from encoded data for PreRedeemShares fee hook
    function __decodePreRedeemSharesSettlementData(bytes memory _settlementData)
        internal
        pure
        returns (address redeemer_, uint256 sharesQuantity_)
    {
        return abi.decode(_settlementData, (address, uint256));
    }

    /// @notice Helper to parse settlement arguments from encoded data for PostBuyShares fee hook
    function __decodePostBuySharesSettlementData(bytes memory _settlementData)
        internal
        pure
        returns (
            address buyer_,
            uint256 investmentAmount_,
            uint256 sharesBought_
        )
    {
        return abi.decode(_settlementData, (address, uint256, uint256));
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `FEE_MANAGER` variable
    /// @return feeManager_ The `FEE_MANAGER` variable value
    function getFeeManager() external view returns (address feeManager_) {
        return FEE_MANAGER;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

/// @title PolicyManager Interface
/// @author Enzyme Council <[email protected]>
/// @notice Interface for the PolicyManager
interface IPolicyManager {
    enum PolicyHook {
        BuySharesSetup,
        PreBuyShares,
        PostBuyShares,
        BuySharesCompleted,
        PreCallOnIntegration,
        PostCallOnIntegration
    }

    function validatePolicies(
        address,
        PolicyHook,
        bytes calldata
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../core/fund/comptroller/IComptroller.sol";
import "../../core/fund/vault/IVault.sol";
import "../IExtension.sol";

/// @title ExtensionBase Contract
/// @author Enzyme Council <[email protected]>
/// @notice Base class for an extension
abstract contract ExtensionBase is IExtension {
    mapping(address => address) internal comptrollerProxyToVaultProxy;

    /// @notice Allows extension to run logic during fund activation
    /// @dev Unimplemented by default, may be overridden.
    function activateForFund(bool) external virtual override {
        return;
    }

    /// @notice Allows extension to run logic during fund deactivation (destruct)
    /// @dev Unimplemented by default, may be overridden.
    function deactivateForFund() external virtual override {
        return;
    }

    /// @notice Receives calls from ComptrollerLib.callOnExtension()
    /// and dispatches the appropriate action
    /// @dev Unimplemented by default, may be overridden.
    function receiveCallFromComptroller(
        address,
        uint256,
        bytes calldata
    ) external virtual override {
        revert("receiveCallFromComptroller: Unimplemented for Extension");
    }

    /// @notice Allows extension to run logic during fund configuration
    /// @dev Unimplemented by default, may be overridden.
    function setConfigForFund(bytes calldata) external virtual override {
        return;
    }

    /// @dev Helper to validate a ComptrollerProxy-VaultProxy relation, which we store for both
    /// gas savings and to guarantee a spoofed ComptrollerProxy does not change getVaultProxy().
    /// Will revert without reason if the expected interfaces do not exist.
    function __setValidatedVaultProxy(address _comptrollerProxy)
        internal
        returns (address vaultProxy_)
    {
        require(
            comptrollerProxyToVaultProxy[_comptrollerProxy] == address(0),
            "__setValidatedVaultProxy: Already set"
        );

        vaultProxy_ = IComptroller(_comptrollerProxy).getVaultProxy();
        require(vaultProxy_ != address(0), "__setValidatedVaultProxy: Missing vaultProxy");

        require(
            _comptrollerProxy == IVault(vaultProxy_).getAccessor(),
            "__setValidatedVaultProxy: Not the VaultProxy accessor"
        );

        comptrollerProxyToVaultProxy[_comptrollerProxy] = vaultProxy_;

        return vaultProxy_;
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the verified VaultProxy for a given ComptrollerProxy
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @return vaultProxy_ The VaultProxy of the fund
    function getVaultProxyForFund(address _comptrollerProxy)
        public
        view
        returns (address vaultProxy_)
    {
        return comptrollerProxyToVaultProxy[_comptrollerProxy];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../core/fund-deployer/IFundDeployer.sol";

/// @title FundDeployerOwnerMixin Contract
/// @author Enzyme Council <[email protected]>
/// @notice A mixin contract that defers ownership to the owner of FundDeployer
abstract contract FundDeployerOwnerMixin {
    address internal immutable FUND_DEPLOYER;

    modifier onlyFundDeployerOwner() {
        require(
            msg.sender == getOwner(),
            "onlyFundDeployerOwner: Only the FundDeployer owner can call this function"
        );
        _;
    }

    constructor(address _fundDeployer) public {
        FUND_DEPLOYER = _fundDeployer;
    }

    /// @notice Gets the owner of this contract
    /// @return owner_ The owner
    /// @dev Ownership is deferred to the owner of the FundDeployer contract
    function getOwner() public view returns (address owner_) {
        return IFundDeployer(FUND_DEPLOYER).getOwner();
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `FUND_DEPLOYER` variable
    /// @return fundDeployer_ The `FUND_DEPLOYER` variable value
    function getFundDeployer() external view returns (address fundDeployer_) {
        return FUND_DEPLOYER;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../core/fund/comptroller/IComptroller.sol";

/// @title PermissionedVaultActionMixin Contract
/// @author Enzyme Council <[email protected]>
/// @notice A mixin contract for extensions that can make permissioned vault calls
abstract contract PermissionedVaultActionMixin {
    /// @notice Adds a tracked asset to the fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _asset The asset to add
    function __addTrackedAsset(address _comptrollerProxy, address _asset) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.AddTrackedAsset,
            abi.encode(_asset)
        );
    }

    /// @notice Grants an allowance to a spender to use a fund's asset
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _asset The asset for which to grant an allowance
    /// @param _target The spender of the allowance
    /// @param _amount The amount of the allowance
    function __approveAssetSpender(
        address _comptrollerProxy,
        address _asset,
        address _target,
        uint256 _amount
    ) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.ApproveAssetSpender,
            abi.encode(_asset, _target, _amount)
        );
    }

    /// @notice Burns fund shares for a particular account
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _target The account for which to burn shares
    /// @param _amount The amount of shares to burn
    function __burnShares(
        address _comptrollerProxy,
        address _target,
        uint256 _amount
    ) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.BurnShares,
            abi.encode(_target, _amount)
        );
    }

    /// @notice Mints fund shares to a particular account
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _target The account to which to mint shares
    /// @param _amount The amount of shares to mint
    function __mintShares(
        address _comptrollerProxy,
        address _target,
        uint256 _amount
    ) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.MintShares,
            abi.encode(_target, _amount)
        );
    }

    /// @notice Removes a tracked asset from the fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _asset The asset to remove
    function __removeTrackedAsset(address _comptrollerProxy, address _asset) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.RemoveTrackedAsset,
            abi.encode(_asset)
        );
    }

    /// @notice Transfers fund shares from one account to another
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _from The account from which to transfer shares
    /// @param _to The account to which to transfer shares
    /// @param _amount The amount of shares to transfer
    function __transferShares(
        address _comptrollerProxy,
        address _from,
        address _to,
        uint256 _amount
    ) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.TransferShares,
            abi.encode(_from, _to, _amount)
        );
    }

    /// @notice Withdraws an asset from the VaultProxy to a given account
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _asset The asset to withdraw
    /// @param _target The account to which to withdraw the asset
    /// @param _amount The amount of asset to withdraw
    function __withdrawAssetTo(
        address _comptrollerProxy,
        address _asset,
        address _target,
        uint256 _amount
    ) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IComptroller.VaultAction.WithdrawAssetTo,
            abi.encode(_asset, _target, _amount)
        );
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IDerivativePriceFeed Interface
/// @author Enzyme Council <[email protected]>
/// @notice Simple interface for derivative price source oracle implementations
interface IDerivativePriceFeed {
    function calcUnderlyingValues(address, uint256)
        external
        returns (address[] memory, uint256[] memory);

    function isSupportedAsset(address) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../../../extensions/utils/FundDeployerOwnerMixin.sol";
import "../../../../interfaces/ISynthetix.sol";
import "../../../../interfaces/ISynthetixAddressResolver.sol";
import "../../../../interfaces/ISynthetixExchangeRates.sol";
import "../../../../interfaces/ISynthetixProxyERC20.sol";
import "../../../../interfaces/ISynthetixSynth.sol";
import "../IDerivativePriceFeed.sol";

/// @title SynthetixPriceFeed Contract
/// @author Enzyme Council <[email protected]>
/// @notice A price feed that uses Synthetix oracles as price sources
contract SynthetixPriceFeed is IDerivativePriceFeed, FundDeployerOwnerMixin {
    using SafeMath for uint256;

    event SynthAdded(address indexed synth, bytes32 currencyKey);

    event SynthCurrencyKeyUpdated(
        address indexed synth,
        bytes32 prevCurrencyKey,
        bytes32 nextCurrencyKey
    );

    uint256 private constant SYNTH_UNIT = 10**18;
    address private immutable ADDRESS_RESOLVER;
    address private immutable SUSD;

    mapping(address => bytes32) private synthToCurrencyKey;

    constructor(
        address _fundDeployer,
        address _addressResolver,
        address _sUSD,
        address[] memory _synths
    ) public FundDeployerOwnerMixin(_fundDeployer) {
        ADDRESS_RESOLVER = _addressResolver;
        SUSD = _sUSD;

        address[] memory sUSDSynths = new address[](1);
        sUSDSynths[0] = _sUSD;

        __addSynths(sUSDSynths);
        __addSynths(_synths);
    }

    /// @notice Converts a given amount of a derivative to its underlying asset values
    /// @param _derivative The derivative to convert
    /// @param _derivativeAmount The amount of the derivative to convert
    /// @return underlyings_ The underlying assets for the _derivative
    /// @return underlyingAmounts_ The amount of each underlying asset for the equivalent derivative amount
    function calcUnderlyingValues(address _derivative, uint256 _derivativeAmount)
        external
        override
        returns (address[] memory underlyings_, uint256[] memory underlyingAmounts_)
    {
        underlyings_ = new address[](1);
        underlyings_[0] = SUSD;
        underlyingAmounts_ = new uint256[](1);

        bytes32 currencyKey = getCurrencyKeyForSynth(_derivative);
        require(currencyKey != 0, "calcUnderlyingValues: _derivative is not supported");

        address exchangeRates = ISynthetixAddressResolver(ADDRESS_RESOLVER).requireAndGetAddress(
            "ExchangeRates",
            "calcUnderlyingValues: Missing ExchangeRates"
        );

        (uint256 rate, bool isInvalid) = ISynthetixExchangeRates(exchangeRates).rateAndInvalid(
            currencyKey
        );
        require(!isInvalid, "calcUnderlyingValues: _derivative rate is not valid");

        underlyingAmounts_[0] = _derivativeAmount.mul(rate).div(SYNTH_UNIT);

        return (underlyings_, underlyingAmounts_);
    }

    /// @notice Checks whether an asset is a supported primitive of the price feed
    /// @param _asset The asset to check
    /// @return isSupported_ True if the asset is a supported primitive
    function isSupportedAsset(address _asset) public view override returns (bool isSupported_) {
        return getCurrencyKeyForSynth(_asset) != 0;
    }

    /////////////////////
    // SYNTHS REGISTRY //
    /////////////////////

    /// @notice Adds Synths to the price feed
    /// @param _synths Synths to add
    function addSynths(address[] calldata _synths) external onlyFundDeployerOwner {
        require(_synths.length > 0, "addSynths: Empty _synths");

        __addSynths(_synths);
    }

    /// @notice Updates the cached currencyKey value for specified Synths
    /// @param _synths Synths to update
    /// @dev Anybody can call this function
    function updateSynthCurrencyKeys(address[] calldata _synths) external {
        require(_synths.length > 0, "updateSynthCurrencyKeys: Empty _synths");

        for (uint256 i; i < _synths.length; i++) {
            bytes32 prevCurrencyKey = synthToCurrencyKey[_synths[i]];
            require(prevCurrencyKey != 0, "updateSynthCurrencyKeys: Synth not set");

            bytes32 nextCurrencyKey = __getCurrencyKey(_synths[i]);
            require(
                nextCurrencyKey != prevCurrencyKey,
                "updateSynthCurrencyKeys: Synth has correct currencyKey"
            );

            synthToCurrencyKey[_synths[i]] = nextCurrencyKey;

            emit SynthCurrencyKeyUpdated(_synths[i], prevCurrencyKey, nextCurrencyKey);
        }
    }

    /// @dev Helper to add Synths
    function __addSynths(address[] memory _synths) private {
        for (uint256 i; i < _synths.length; i++) {
            require(synthToCurrencyKey[_synths[i]] == 0, "__addSynths: Value already set");

            bytes32 currencyKey = __getCurrencyKey(_synths[i]);
            require(currencyKey != 0, "__addSynths: No currencyKey");

            synthToCurrencyKey[_synths[i]] = currencyKey;

            emit SynthAdded(_synths[i], currencyKey);
        }
    }

    /// @dev Helper to query a currencyKey from Synthetix
    function __getCurrencyKey(address _synthProxy) private view returns (bytes32 currencyKey_) {
        return ISynthetixSynth(ISynthetixProxyERC20(_synthProxy).target()).currencyKey();
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `ADDRESS_RESOLVER` variable
    /// @return addressResolver_ The `ADDRESS_RESOLVER` variable value
    function getAddressResolver() external view returns (address) {
        return ADDRESS_RESOLVER;
    }

    /// @notice Gets the currencyKey for multiple given Synths
    /// @return currencyKeys_ The currencyKey values
    function getCurrencyKeysForSynths(address[] calldata _synths)
        external
        view
        returns (bytes32[] memory currencyKeys_)
    {
        currencyKeys_ = new bytes32[](_synths.length);
        for (uint256 i; i < _synths.length; i++) {
            currencyKeys_[i] = synthToCurrencyKey[_synths[i]];
        }

        return currencyKeys_;
    }

    /// @notice Gets the `SUSD` variable
    /// @return susd_ The `SUSD` variable value
    function getSUSD() external view returns (address susd_) {
        return SUSD;
    }

    /// @notice Gets the currencyKey for a given Synth
    /// @return currencyKey_ The currencyKey value
    function getCurrencyKeyForSynth(address _synth) public view returns (bytes32 currencyKey_) {
        return synthToCurrencyKey[_synth];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IPrimitivePriceFeed Interface
/// @author Enzyme Council <[email protected]>
/// @notice Interface for primitive price feeds
interface IPrimitivePriceFeed {
    function calcCanonicalValue(
        address,
        uint256,
        address
    ) external view returns (uint256, bool);

    function calcLiveValue(
        address,
        uint256,
        address
    ) external view returns (uint256, bool);

    function isSupportedAsset(address) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title IValueInterpreter interface
/// @author Enzyme Council <[email protected]>
/// @notice Interface for ValueInterpreter
interface IValueInterpreter {
    function calcCanonicalAssetValue(
        address,
        uint256,
        address
    ) external returns (uint256, bool);

    function calcCanonicalAssetsTotalValue(
        address[] calldata,
        uint256[] calldata,
        address
    ) external returns (uint256, bool);

    function calcLiveAssetValue(
        address,
        uint256,
        address
    ) external returns (uint256, bool);

    function calcLiveAssetsTotalValue(
        address[] calldata,
        uint256[] calldata,
        address
    ) external returns (uint256, bool);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title ISynthetix Interface
/// @author Enzyme Council <[email protected]>
interface ISynthetix {
    function exchangeOnBehalfWithTracking(
        address,
        bytes32,
        uint256,
        bytes32,
        address,
        bytes32
    ) external returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title ISynthetixAddressResolver Interface
/// @author Enzyme Council <[email protected]>
interface ISynthetixAddressResolver {
    function requireAndGetAddress(bytes32, string calldata) external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title ISynthetixExchangeRates Interface
/// @author Enzyme Council <[email protected]>
interface ISynthetixExchangeRates {
    function rateAndInvalid(bytes32) external view returns (uint256, bool);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title ISynthetixExchanger Interface
/// @author Enzyme Council <[email protected]>
interface ISynthetixExchanger {
    function getAmountsForExchange(
        uint256,
        bytes32,
        bytes32
    )
        external
        view
        returns (
            uint256,
            uint256,
            uint256
        );

    function settle(address, bytes32)
        external
        returns (
            uint256,
            uint256,
            uint256
        );
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title ISynthetixProxyERC20 Interface
/// @author Enzyme Council <[email protected]>
interface ISynthetixProxyERC20 {
    function target() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title ISynthetixSynth Interface
/// @author Enzyme Council <[email protected]>
interface ISynthetixSynth {
    function currencyKey() external view returns (bytes32);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title AddressArray Library
/// @author Enzyme Council <[email protected]>
/// @notice A library to extend the address array data type
library AddressArrayLib {
    /// @dev Helper to add an item to an array. Does not assert uniqueness of the new item.
    function addItem(address[] memory _self, address _itemToAdd)
        internal
        pure
        returns (address[] memory nextArray_)
    {
        nextArray_ = new address[](_self.length + 1);
        for (uint256 i; i < _self.length; i++) {
            nextArray_[i] = _self[i];
        }
        nextArray_[_self.length] = _itemToAdd;

        return nextArray_;
    }

    /// @dev Helper to add an item to an array, only if it is not already in the array.
    function addUniqueItem(address[] memory _self, address _itemToAdd)
        internal
        pure
        returns (address[] memory nextArray_)
    {
        if (contains(_self, _itemToAdd)) {
            return _self;
        }

        return addItem(_self, _itemToAdd);
    }

    /// @dev Helper to verify if an array contains a particular value
    function contains(address[] memory _self, address _target)
        internal
        pure
        returns (bool doesContain_)
    {
        for (uint256 i; i < _self.length; i++) {
            if (_target == _self[i]) {
                return true;
            }
        }
        return false;
    }

    /// @dev Helper to reassign all items in an array with a specified value
    function fill(address[] memory _self, address _value)
        internal
        pure
        returns (address[] memory nextArray_)
    {
        nextArray_ = new address[](_self.length);
        for (uint256 i; i < nextArray_.length; i++) {
            nextArray_[i] = _value;
        }

        return nextArray_;
    }

    /// @dev Helper to verify if array is a set of unique values.
    /// Does not assert length > 0.
    function isUniqueSet(address[] memory _self) internal pure returns (bool isUnique_) {
        if (_self.length <= 1) {
            return true;
        }

        uint256 arrayLength = _self.length;
        for (uint256 i; i < arrayLength; i++) {
            for (uint256 j = i + 1; j < arrayLength; j++) {
                if (_self[i] == _self[j]) {
                    return false;
                }
            }
        }

        return true;
    }

    /// @dev Helper to remove items from an array. Removes all matching occurrences of each item.
    /// Does not assert uniqueness of either array.
    function removeItems(address[] memory _self, address[] memory _itemsToRemove)
        internal
        pure
        returns (address[] memory nextArray_)
    {
        if (_itemsToRemove.length == 0) {
            return _self;
        }

        bool[] memory indexesToRemove = new bool[](_self.length);
        uint256 remainingItemsCount = _self.length;
        for (uint256 i; i < _self.length; i++) {
            if (contains(_itemsToRemove, _self[i])) {
                indexesToRemove[i] = true;
                remainingItemsCount--;
            }
        }

        if (remainingItemsCount == _self.length) {
            nextArray_ = _self;
        } else if (remainingItemsCount > 0) {
            nextArray_ = new address[](remainingItemsCount);
            uint256 nextArrayIndex;
            for (uint256 i; i < _self.length; i++) {
                if (!indexesToRemove[i]) {
                    nextArray_[nextArrayIndex] = _self[i];
                    nextArrayIndex++;
                }
            }
        }

        return nextArray_;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <[email protected]>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../infrastructure/price-feeds/derivatives/feeds/SynthetixPriceFeed.sol";
import "../interfaces/ISynthetixAddressResolver.sol";
import "../interfaces/ISynthetixExchanger.sol";

/// @title AssetFinalityResolver Contract
/// @author Enzyme Council <[email protected]>
/// @notice A contract that helps achieve asset finality
abstract contract AssetFinalityResolver {
    address internal immutable SYNTHETIX_ADDRESS_RESOLVER;
    address internal immutable SYNTHETIX_PRICE_FEED;

    constructor(address _synthetixPriceFeed, address _synthetixAddressResolver) public {
        SYNTHETIX_ADDRESS_RESOLVER = _synthetixAddressResolver;
        SYNTHETIX_PRICE_FEED = _synthetixPriceFeed;
    }

    /// @dev Helper to finalize a Synth balance at a given target address and return its balance
    function __finalizeIfSynthAndGetAssetBalance(
        address _target,
        address _asset,
        bool _requireFinality
    ) internal returns (uint256 assetBalance_) {
        bytes32 currencyKey = SynthetixPriceFeed(SYNTHETIX_PRICE_FEED).getCurrencyKeyForSynth(
            _asset
        );
        if (currencyKey != 0) {
            address synthetixExchanger = ISynthetixAddressResolver(SYNTHETIX_ADDRESS_RESOLVER)
                .requireAndGetAddress(
                "Exchanger",
                "finalizeAndGetAssetBalance: Missing Exchanger"
            );
            try ISynthetixExchanger(synthetixExchanger).settle(_target, currencyKey)  {} catch {
                require(!_requireFinality, "finalizeAndGetAssetBalance: Cannot settle Synth");
            }
        }

        return ERC20(_asset).balanceOf(_target);
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `SYNTHETIX_ADDRESS_RESOLVER` variable
    /// @return synthetixAddressResolver_ The `SYNTHETIX_ADDRESS_RESOLVER` variable value
    function getSynthetixAddressResolver()
        external
        view
        returns (address synthetixAddressResolver_)
    {
        return SYNTHETIX_ADDRESS_RESOLVER;
    }

    /// @notice Gets the `SYNTHETIX_PRICE_FEED` variable
    /// @return synthetixPriceFeed_ The `SYNTHETIX_PRICE_FEED` variable value
    function getSynthetixPriceFeed() external view returns (address synthetixPriceFeed_) {
        return SYNTHETIX_PRICE_FEED;
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "details": {
      "constantOptimizer": true,
      "cse": true,
      "deduplicate": true,
      "jumpdestRemover": true,
      "orderLiterals": true,
      "peephole": true,
      "yul": false
    },
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_feeManager","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"comptrollerProxy","type":"address"},{"indexed":false,"internalType":"uint256","name":"highWaterMark","type":"uint256"}],"name":"ActivatedForFund","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"comptrollerProxy","type":"address"},{"indexed":false,"internalType":"uint256","name":"rate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"period","type":"uint256"}],"name":"FundSettingsAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"comptrollerProxy","type":"address"},{"indexed":false,"internalType":"uint256","name":"prevSharePrice","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nextSharePrice","type":"uint256"}],"name":"LastSharePriceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"comptrollerProxy","type":"address"},{"indexed":false,"internalType":"uint256","name":"prevHighWaterMark","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nextHighWaterMark","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"aggregateValueDue","type":"uint256"}],"name":"PaidOut","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"comptrollerProxy","type":"address"},{"indexed":false,"internalType":"uint256","name":"prevAggregateValueDue","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nextAggregateValueDue","type":"uint256"},{"indexed":false,"internalType":"int256","name":"sharesOutstandingDiff","type":"int256"}],"name":"PerformanceUpdated","type":"event"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"activateForFund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"},{"internalType":"bytes","name":"_settingsData","type":"bytes"}],"name":"addFundSettings","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"}],"name":"getFeeInfoForFund","outputs":[{"components":[{"internalType":"uint256","name":"rate","type":"uint256"},{"internalType":"uint256","name":"period","type":"uint256"},{"internalType":"uint256","name":"activated","type":"uint256"},{"internalType":"uint256","name":"lastPaid","type":"uint256"},{"internalType":"uint256","name":"highWaterMark","type":"uint256"},{"internalType":"uint256","name":"lastSharePrice","type":"uint256"},{"internalType":"uint256","name":"aggregateValueDue","type":"uint256"}],"internalType":"struct PerformanceFee.FeeInfo","name":"feeInfo_","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFeeManager","outputs":[{"internalType":"address","name":"feeManager_","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"identifier","outputs":[{"internalType":"string","name":"identifier_","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"implementedHooks","outputs":[{"internalType":"enum IFeeManager.FeeHook[]","name":"implementedHooksForSettle_","type":"uint8[]"},{"internalType":"enum IFeeManager.FeeHook[]","name":"implementedHooksForUpdate_","type":"uint8[]"},{"internalType":"bool","name":"usesGavOnSettle_","type":"bool"},{"internalType":"bool","name":"usesGavOnUpdate_","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"payout","outputs":[{"internalType":"bool","name":"isPayable_","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"}],"name":"payoutAllowed","outputs":[{"internalType":"bool","name":"payoutAllowed_","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"},{"internalType":"address","name":"_vaultProxy","type":"address"},{"internalType":"enum IFeeManager.FeeHook","name":"","type":"uint8"},{"internalType":"bytes","name":"","type":"bytes"},{"internalType":"uint256","name":"_gav","type":"uint256"}],"name":"settle","outputs":[{"internalType":"enum IFeeManager.SettlementType","name":"settlementType_","type":"uint8"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"sharesDue_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_comptrollerProxy","type":"address"},{"internalType":"address","name":"_vaultProxy","type":"address"},{"internalType":"enum IFeeManager.FeeHook","name":"_hook","type":"uint8"},{"internalType":"bytes","name":"_settlementData","type":"bytes"},{"internalType":"uint256","name":"_gav","type":"uint256"}],"name":"update","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000005d0a363e9a17fb839e2843ffa93c808cdafccb67

-----Decoded View---------------
Arg [0] : _feeManager (address): 0x5D0A363E9a17fb839e2843ffa93C808CdafCCb67

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000005d0a363e9a17fb839e2843ffa93c808cdafccb67