// 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: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    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 <security@enzyme.finance>
/// @notice A library to extend the address array data type
library AddressArrayLib {
    /////////////
    // STORAGE //
    /////////////

    /// @dev Helper to remove an item from a storage array
    function removeStorageItem(address[] storage _self, address _itemToRemove)
        internal
        returns (bool removed_)
    {
        uint256 itemCount = _self.length;
        for (uint256 i; i < itemCount; i++) {
            if (_self[i] == _itemToRemove) {
                if (i < itemCount - 1) {
                    _self[i] = _self[itemCount - 1];
                }
                _self.pop();
                removed_ = true;
                break;
            }
        }

        return removed_;
    }

    ////////////
    // MEMORY //
    ////////////

    /// @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 merge the unique items of a second array.
    /// Does not consider uniqueness of either array, only relative uniqueness.
    /// Preserves ordering.
    function mergeArray(address[] memory _self, address[] memory _arrayToMerge)
        internal
        pure
        returns (address[] memory nextArray_)
    {
        uint256 newUniqueItemCount;
        for (uint256 i; i < _arrayToMerge.length; i++) {
            if (!contains(_self, _arrayToMerge[i])) {
                newUniqueItemCount++;
            }
        }

        if (newUniqueItemCount == 0) {
            return _self;
        }

        nextArray_ = new address[](_self.length + newUniqueItemCount);
        for (uint256 i; i < _self.length; i++) {
            nextArray_[i] = _self[i];
        }
        uint256 nextArrayIndex = _self.length;
        for (uint256 i; i < _arrayToMerge.length; i++) {
            if (!contains(_self, _arrayToMerge[i])) {
                nextArray_[nextArrayIndex] = _arrayToMerge[i];
                nextArrayIndex++;
            }
        }

        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 <council@enzyme.finance>

    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";

/// @title AssetHelpers Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A util contract for common token actions
abstract contract AssetHelpers {
    using SafeERC20 for ERC20;
    using SafeMath for uint256;

    /// @dev Helper to approve a target account with the max amount of an asset.
    /// This is helpful for fully trusted contracts, such as adapters that
    /// interact with external protocol like Uniswap, Compound, etc.
    function __approveAssetMaxAsNeeded(
        address _asset,
        address _target,
        uint256 _neededAmount
    ) internal {
        uint256 allowance = ERC20(_asset).allowance(address(this), _target);
        if (allowance < _neededAmount) {
            if (allowance > 0) {
                ERC20(_asset).safeApprove(_target, 0);
            }
            ERC20(_asset).safeApprove(_target, type(uint256).max);
        }
    }

    /// @dev Helper to transfer full asset balances from the current contract to a target
    function __pushFullAssetBalances(address _target, address[] memory _assets)
        internal
        returns (uint256[] memory amountsTransferred_)
    {
        amountsTransferred_ = new uint256[](_assets.length);
        for (uint256 i; i < _assets.length; i++) {
            ERC20 assetContract = ERC20(_assets[i]);
            amountsTransferred_[i] = assetContract.balanceOf(address(this));
            if (amountsTransferred_[i] > 0) {
                assetContract.safeTransfer(_target, amountsTransferred_[i]);
            }
        }

        return amountsTransferred_;
    }
}

// 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;

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: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

import "../../utils/FundDeployerOwnerMixin.sol";
import "../IExtension.sol";

/// @title ExtensionBase Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Base class for an extension
abstract contract ExtensionBase is IExtension, FundDeployerOwnerMixin {
    event ValidatedVaultProxySetForFund(
        address indexed comptrollerProxy,
        address indexed vaultProxy
    );

    mapping(address => address) internal comptrollerProxyToVaultProxy;

    modifier onlyFundDeployer() {
        require(msg.sender == getFundDeployer(), "Only the FundDeployer can make this call");
        _;
    }

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

    /// @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(
        address,
        address,
        bytes calldata
    ) external virtual override {
        return;
    }

    /// @dev Helper to store the validated ComptrollerProxy-VaultProxy relation
    function __setValidatedVaultProxy(address _comptrollerProxy, address _vaultProxy) internal {
        comptrollerProxyToVaultProxy[_comptrollerProxy] = _vaultProxy;

        emit ValidatedVaultProxySetForFund(_comptrollerProxy, _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 <council@enzyme.finance>

    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 <security@enzyme.finance>
/// @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() public view returns (address fundDeployer_) {
        return FUND_DEPLOYER;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

import "../vault/IVault.sol";

/// @title IComptroller Interface
/// @author Enzyme Council <security@enzyme.finance>
interface IComptroller {
    function activate(bool) external;

    function calcGav() external returns (uint256);

    function calcGrossShareValue() external returns (uint256);

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

    function destructActivated(uint256, uint256) external;

    function destructUnactivated() external;

    function getDenominationAsset() external view returns (address);

    function getExternalPositionManager() external view returns (address);

    function getFeeManager() external view returns (address);

    function getFundDeployer() external view returns (address);

    function getGasRelayPaymaster() external view returns (address);

    function getIntegrationManager() external view returns (address);

    function getPolicyManager() external view returns (address);

    function getVaultProxy() external view returns (address);

    function init(address, uint256) external;

    function permissionedVaultAction(IVault.VaultAction, bytes calldata) external;

    function preTransferSharesHook(
        address,
        address,
        uint256
    ) external;

    function preTransferSharesHookFreelyTransferable(address) external view;

    function setGasRelayPaymaster(address) external;

    function setVaultProxy(address) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    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 <security@enzyme.finance>
/// @notice Interface for all extensions
interface IExtension {
    function activateForFund(bool _isMigration) external;

    function deactivateForFund() external;

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

    function setConfigForFund(
        address _comptrollerProxy,
        address _vaultProxy,
        bytes calldata _configData
    ) external;
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

/// @title IExternalPositionVault interface
/// @author Enzyme Council <security@enzyme.finance>
/// Provides an interface to get the externalPositionLib for a given type from the Vault
interface IExternalPositionVault {
    function getExternalPositionLibForType(uint256) external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

/// @title IFreelyTransferableSharesVault Interface
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Provides the interface for determining whether a vault's shares
/// are guaranteed to be freely transferable.
/// @dev DO NOT EDIT CONTRACT
interface IFreelyTransferableSharesVault {
    function sharesAreFreelyTransferable()
        external
        view
        returns (bool sharesAreFreelyTransferable_);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    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 <security@enzyme.finance>
interface IFundDeployer {
    function getOwner() external view returns (address);

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

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

    function isAllowedVaultCall(
        address,
        bytes4,
        bytes32
    ) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

import "../IIntegrationManager.sol";

/// @title Integration Adapter interface
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Interface for all integration adapters
interface IIntegrationAdapter {
    function parseAssetsForAction(
        address _vaultProxy,
        bytes4 _selector,
        bytes calldata _encodedCallArgs
    )
        external
        view
        returns (
            IIntegrationManager.SpendAssetsHandleType spendAssetsHandleType_,
            address[] memory spendAssets_,
            uint256[] memory spendAssetAmounts_,
            address[] memory incomingAssets_,
            uint256[] memory minIncomingAssetAmounts_
        );
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

/// @title IIntegrationManager interface
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Interface for the IntegrationManager
interface IIntegrationManager {
    enum SpendAssetsHandleType {None, Approve, Transfer}
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    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 <security@enzyme.finance>
/// @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 <council@enzyme.finance>

    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 <security@enzyme.finance>
/// @notice Interface for the PolicyManager
interface IPolicyManager {
    // When updating PolicyHook, also update these functions in PolicyManager:
    // 1. __getAllPolicyHooks()
    // 2. __policyHookRestrictsCurrentInvestorActions()
    enum PolicyHook {
        PostBuyShares,
        PostCallOnIntegration,
        PreTransferShares,
        RedeemSharesForSpecificAssets,
        AddTrackedAssets,
        RemoveTrackedAssets,
        CreateExternalPosition,
        PostCallOnExternalPosition,
        RemoveExternalPosition,
        ReactivateExternalPosition
    }

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

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    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 <security@enzyme.finance>
/// @notice Interface for ValueInterpreter
interface IValueInterpreter {
    function calcCanonicalAssetValue(
        address,
        uint256,
        address
    ) external returns (uint256);

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

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

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

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

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

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

pragma solidity 0.6.12;

import "../../../../persistent/vault/interfaces/IExternalPositionVault.sol";
import "../../../../persistent/vault/interfaces/IFreelyTransferableSharesVault.sol";
import "../../../../persistent/vault/interfaces/IMigratableVault.sol";

/// @title IVault Interface
/// @author Enzyme Council <security@enzyme.finance>
interface IVault is IMigratableVault, IFreelyTransferableSharesVault, IExternalPositionVault {
    enum VaultAction {
        None,
        // Shares management
        BurnShares,
        MintShares,
        TransferShares,
        // Asset management
        AddTrackedAsset,
        ApproveAssetSpender,
        RemoveTrackedAsset,
        WithdrawAssetTo,
        // External position management
        AddExternalPosition,
        CallOnExternalPosition,
        RemoveExternalPosition
    }

    function addTrackedAsset(address) external;

    function burnShares(address, uint256) external;

    function buyBackProtocolFeeShares(
        uint256,
        uint256,
        uint256
    ) external;

    function callOnContract(address, bytes calldata) external returns (bytes memory);

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

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

    function getAccessor() external view returns (address);

    function getOwner() external view returns (address);

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

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

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

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

    function mintShares(address, uint256) external;

    function payProtocolFee() external;

    function receiveValidatedVaultAction(VaultAction, bytes calldata) external;

    function setAccessorForFundReconfiguration(address) external;

    function setSymbol(string calldata) 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 <council@enzyme.finance>

    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 "../../core/fund/vault/IVault.sol";
import "../../infrastructure/value-interpreter/IValueInterpreter.sol";
import "../../utils/AddressArrayLib.sol";
import "../../utils/AssetHelpers.sol";
import "../policy-manager/IPolicyManager.sol";
import "../utils/ExtensionBase.sol";
import "../utils/PermissionedVaultActionMixin.sol";
import "./integrations/IIntegrationAdapter.sol";
import "./IIntegrationManager.sol";

/// @title IntegrationManager
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Extension to handle DeFi integration actions for funds
/// @dev Any arbitrary adapter is allowed by default, so all participants must be aware of
/// their fund's configuration, especially whether they use a policy that only allows
/// official adapters. Owners and asset managers must also establish trust for any
/// arbitrary adapters that they interact with.
contract IntegrationManager is
    IIntegrationManager,
    ExtensionBase,
    PermissionedVaultActionMixin,
    AssetHelpers
{
    using AddressArrayLib for address[];
    using SafeMath for uint256;

    event CallOnIntegrationExecutedForFund(
        address indexed comptrollerProxy,
        address caller,
        address indexed adapter,
        bytes4 indexed selector,
        bytes integrationData,
        address[] incomingAssets,
        uint256[] incomingAssetAmounts,
        address[] spendAssets,
        uint256[] spendAssetAmounts
    );

    address private immutable POLICY_MANAGER;
    address private immutable VALUE_INTERPRETER;

    constructor(
        address _fundDeployer,
        address _policyManager,
        address _valueInterpreter
    ) public ExtensionBase(_fundDeployer) {
        POLICY_MANAGER = _policyManager;
        VALUE_INTERPRETER = _valueInterpreter;
    }

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

    /// @notice Enables the IntegrationManager to be used by a fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _vaultProxy The VaultProxy of the fund
    function setConfigForFund(
        address _comptrollerProxy,
        address _vaultProxy,
        bytes calldata
    ) external override onlyFundDeployer {
        __setValidatedVaultProxy(_comptrollerProxy, _vaultProxy);
    }

    ///////////////////////////////
    // CALL-ON-EXTENSION ACTIONS //
    ///////////////////////////////

    /// @notice Receives a dispatched `callOnExtension` from a fund's ComptrollerProxy
    /// @param _caller The user who called for this action
    /// @param _actionId An ID representing the desired action
    /// @param _callArgs The encoded args for the action
    function receiveCallFromComptroller(
        address _caller,
        uint256 _actionId,
        bytes calldata _callArgs
    ) external override {
        address comptrollerProxy = msg.sender;

        // This validation comes at negligible cost but is not strictly necessary,
        // as all actions below call permissioned actions on the VaultProxy,
        // which will fail for an invalid ComptrollerProxy
        address vaultProxy = getVaultProxyForFund(comptrollerProxy);
        require(vaultProxy != address(0), "receiveCallFromComptroller: Fund is not valid");

        require(
            IVault(vaultProxy).canManageAssets(_caller),
            "receiveCallFromComptroller: Unauthorized"
        );

        // Dispatch the action
        if (_actionId == 0) {
            __callOnIntegration(_caller, comptrollerProxy, vaultProxy, _callArgs);
        } else if (_actionId == 1) {
            __addTrackedAssetsToVault(_caller, comptrollerProxy, _callArgs);
        } else if (_actionId == 2) {
            __removeTrackedAssetsFromVault(_caller, comptrollerProxy, _callArgs);
        } else {
            revert("receiveCallFromComptroller: Invalid _actionId");
        }
    }

    /// @dev Adds assets as tracked assets of the vault.
    /// Does not validate that assets are not already tracked.
    function __addTrackedAssetsToVault(
        address _caller,
        address _comptrollerProxy,
        bytes memory _callArgs
    ) private {
        address[] memory assets = abi.decode(_callArgs, (address[]));

        IPolicyManager(getPolicyManager()).validatePolicies(
            _comptrollerProxy,
            IPolicyManager.PolicyHook.AddTrackedAssets,
            abi.encode(_caller, assets)
        );

        for (uint256 i; i < assets.length; i++) {
            require(
                IValueInterpreter(getValueInterpreter()).isSupportedAsset(assets[i]),
                "__addTrackedAssetsToVault: Unsupported asset"
            );

            __addTrackedAsset(_comptrollerProxy, assets[i]);
        }
    }

    /// @dev Removes assets from the tracked assets of the vault.
    /// Does not validate that assets are not already tracked.
    function __removeTrackedAssetsFromVault(
        address _caller,
        address _comptrollerProxy,
        bytes memory _callArgs
    ) private {
        address[] memory assets = abi.decode(_callArgs, (address[]));

        IPolicyManager(getPolicyManager()).validatePolicies(
            _comptrollerProxy,
            IPolicyManager.PolicyHook.RemoveTrackedAssets,
            abi.encode(_caller, assets)
        );

        for (uint256 i; i < assets.length; i++) {
            __removeTrackedAsset(_comptrollerProxy, assets[i]);
        }
    }

    /////////////////////////
    // CALL ON INTEGRATION //
    /////////////////////////

    /// @notice Universal method for calling third party contract functions through adapters
    /// @param _caller The caller of this function via the ComptrollerProxy
    /// @param _comptrollerProxy The ComptrollerProxy
    /// @param _vaultProxy The VaultProxy
    /// @param _callArgs The encoded args for this function
    /// - _adapter Adapter of the integration on which to execute a call
    /// - _selector Method selector of the adapter method to execute
    /// - _integrationData Encoded arguments specific to the adapter
    /// @dev Refer to specific adapter to see how to encode its arguments.
    function __callOnIntegration(
        address _caller,
        address _comptrollerProxy,
        address _vaultProxy,
        bytes memory _callArgs
    ) private {
        // Validating the ComptrollerProxy is the active VaultProxy.accessor()
        // protects against corner cases of lingering permissions on adapters issued
        // via VaultLib.callOnContract() that could otherwise be called from an
        // undestructed ComptrollerProxy
        require(
            _comptrollerProxy == IVault(_vaultProxy).getAccessor(),
            "receiveCallFromComptroller: Fund is not active"
        );

        (
            address adapter,
            bytes4 selector,
            bytes memory integrationData
        ) = __decodeCallOnIntegrationArgs(_callArgs);

        (
            address[] memory incomingAssets,
            uint256[] memory incomingAssetAmounts,
            address[] memory spendAssets,
            uint256[] memory spendAssetAmounts
        ) = __callOnIntegrationInner(
            _comptrollerProxy,
            _vaultProxy,
            adapter,
            selector,
            integrationData
        );

        IPolicyManager(getPolicyManager()).validatePolicies(
            _comptrollerProxy,
            IPolicyManager.PolicyHook.PostCallOnIntegration,
            abi.encode(
                _caller,
                adapter,
                selector,
                incomingAssets,
                incomingAssetAmounts,
                spendAssets,
                spendAssetAmounts
            )
        );

        emit CallOnIntegrationExecutedForFund(
            _comptrollerProxy,
            _caller,
            adapter,
            selector,
            integrationData,
            incomingAssets,
            incomingAssetAmounts,
            spendAssets,
            spendAssetAmounts
        );
    }

    /// @dev Helper to execute the bulk of logic of callOnIntegration.
    /// Avoids the stack-too-deep-error.
    function __callOnIntegrationInner(
        address _comptrollerProxy,
        address _vaultProxy,
        address _adapter,
        bytes4 _selector,
        bytes memory _integrationData
    )
        private
        returns (
            address[] memory incomingAssets_,
            uint256[] memory incomingAssetAmounts_,
            address[] memory spendAssets_,
            uint256[] memory spendAssetAmounts_
        )
    {
        uint256[] memory preCallIncomingAssetBalances;
        uint256[] memory minIncomingAssetAmounts;
        SpendAssetsHandleType spendAssetsHandleType;
        uint256[] memory maxSpendAssetAmounts;
        uint256[] memory preCallSpendAssetBalances;

        (
            incomingAssets_,
            preCallIncomingAssetBalances,
            minIncomingAssetAmounts,
            spendAssetsHandleType,
            spendAssets_,
            maxSpendAssetAmounts,
            preCallSpendAssetBalances
        ) = __preProcessCoI(_comptrollerProxy, _vaultProxy, _adapter, _selector, _integrationData);

        __executeCoI(
            _vaultProxy,
            _adapter,
            _selector,
            _integrationData,
            abi.encode(spendAssets_, maxSpendAssetAmounts, incomingAssets_)
        );

        (incomingAssetAmounts_, spendAssetAmounts_) = __postProcessCoI(
            _comptrollerProxy,
            _vaultProxy,
            _adapter,
            incomingAssets_,
            preCallIncomingAssetBalances,
            minIncomingAssetAmounts,
            spendAssetsHandleType,
            spendAssets_,
            maxSpendAssetAmounts,
            preCallSpendAssetBalances
        );

        return (incomingAssets_, incomingAssetAmounts_, spendAssets_, spendAssetAmounts_);
    }

    /// @dev Helper to decode CoI args
    function __decodeCallOnIntegrationArgs(bytes memory _callArgs)
        private
        pure
        returns (
            address adapter_,
            bytes4 selector_,
            bytes memory integrationData_
        )
    {
        return abi.decode(_callArgs, (address, bytes4, bytes));
    }

    /// @dev Helper to execute a call to an integration
    /// @dev Avoids stack-too-deep error
    function __executeCoI(
        address _vaultProxy,
        address _adapter,
        bytes4 _selector,
        bytes memory _integrationData,
        bytes memory _assetData
    ) private {
        (bool success, bytes memory returnData) = _adapter.call(
            abi.encodeWithSelector(_selector, _vaultProxy, _integrationData, _assetData)
        );
        require(success, string(returnData));
    }

    /// @dev Helper to get the vault's balance of a particular asset
    function __getVaultAssetBalance(address _vaultProxy, address _asset)
        private
        view
        returns (uint256)
    {
        return ERC20(_asset).balanceOf(_vaultProxy);
    }

    /// @dev Helper for the internal actions to take prior to executing CoI
    function __preProcessCoI(
        address _comptrollerProxy,
        address _vaultProxy,
        address _adapter,
        bytes4 _selector,
        bytes memory _integrationData
    )
        private
        returns (
            address[] memory incomingAssets_,
            uint256[] memory preCallIncomingAssetBalances_,
            uint256[] memory minIncomingAssetAmounts_,
            SpendAssetsHandleType spendAssetsHandleType_,
            address[] memory spendAssets_,
            uint256[] memory maxSpendAssetAmounts_,
            uint256[] memory preCallSpendAssetBalances_
        )
    {
        // Note that incoming and spend assets are allowed to overlap
        // (e.g., a fee for the incomingAsset charged in a spend asset)
        (
            spendAssetsHandleType_,
            spendAssets_,
            maxSpendAssetAmounts_,
            incomingAssets_,
            minIncomingAssetAmounts_
        ) = IIntegrationAdapter(_adapter).parseAssetsForAction(
            _vaultProxy,
            _selector,
            _integrationData
        );
        require(
            spendAssets_.length == maxSpendAssetAmounts_.length,
            "__preProcessCoI: Spend assets arrays unequal"
        );
        require(
            incomingAssets_.length == minIncomingAssetAmounts_.length,
            "__preProcessCoI: Incoming assets arrays unequal"
        );
        require(spendAssets_.isUniqueSet(), "__preProcessCoI: Duplicate spend asset");
        require(incomingAssets_.isUniqueSet(), "__preProcessCoI: Duplicate incoming asset");

        // INCOMING ASSETS

        // Incoming asset balances must be recorded prior to spend asset balances in case there
        // is an overlap (an asset that is both a spend asset and an incoming asset),
        // as a spend asset can be immediately transferred after recording its balance
        preCallIncomingAssetBalances_ = new uint256[](incomingAssets_.length);
        for (uint256 i; i < incomingAssets_.length; i++) {
            require(
                IValueInterpreter(getValueInterpreter()).isSupportedAsset(incomingAssets_[i]),
                "__preProcessCoI: Non-receivable incoming asset"
            );

            preCallIncomingAssetBalances_[i] = ERC20(incomingAssets_[i]).balanceOf(_vaultProxy);
        }

        // SPEND ASSETS

        preCallSpendAssetBalances_ = new uint256[](spendAssets_.length);
        for (uint256 i; i < spendAssets_.length; i++) {
            preCallSpendAssetBalances_[i] = ERC20(spendAssets_[i]).balanceOf(_vaultProxy);

            // Grant adapter access to the spend assets.
            // spendAssets_ is already asserted to be a unique set.
            if (spendAssetsHandleType_ == SpendAssetsHandleType.Approve) {
                // Use exact approve amount, and reset afterwards
                __approveAssetSpender(
                    _comptrollerProxy,
                    spendAssets_[i],
                    _adapter,
                    maxSpendAssetAmounts_[i]
                );
            } else if (spendAssetsHandleType_ == SpendAssetsHandleType.Transfer) {
                __withdrawAssetTo(
                    _comptrollerProxy,
                    spendAssets_[i],
                    _adapter,
                    maxSpendAssetAmounts_[i]
                );
            }
        }
    }

    /// @dev Helper to reconcile incoming and spend assets after executing CoI
    function __postProcessCoI(
        address _comptrollerProxy,
        address _vaultProxy,
        address _adapter,
        address[] memory _incomingAssets,
        uint256[] memory _preCallIncomingAssetBalances,
        uint256[] memory _minIncomingAssetAmounts,
        SpendAssetsHandleType _spendAssetsHandleType,
        address[] memory _spendAssets,
        uint256[] memory _maxSpendAssetAmounts,
        uint256[] memory _preCallSpendAssetBalances
    )
        private
        returns (uint256[] memory incomingAssetAmounts_, uint256[] memory spendAssetAmounts_)
    {
        // INCOMING ASSETS

        incomingAssetAmounts_ = new uint256[](_incomingAssets.length);
        for (uint256 i; i < _incomingAssets.length; i++) {
            incomingAssetAmounts_[i] = __getVaultAssetBalance(_vaultProxy, _incomingAssets[i]).sub(
                _preCallIncomingAssetBalances[i]
            );
            require(
                incomingAssetAmounts_[i] >= _minIncomingAssetAmounts[i],
                "__postProcessCoI: Received incoming asset less than expected"
            );

            // Even if the asset's previous balance was >0, it might not have been tracked
            __addTrackedAsset(_comptrollerProxy, _incomingAssets[i]);
        }

        // SPEND ASSETS

        spendAssetAmounts_ = new uint256[](_spendAssets.length);
        for (uint256 i; i < _spendAssets.length; i++) {
            // Calculate the balance change of spend assets. Ignore if balance increased.
            uint256 postCallSpendAssetBalance = __getVaultAssetBalance(
                _vaultProxy,
                _spendAssets[i]
            );
            if (postCallSpendAssetBalance < _preCallSpendAssetBalances[i]) {
                spendAssetAmounts_[i] = _preCallSpendAssetBalances[i].sub(
                    postCallSpendAssetBalance
                );
            }

            // Reset any unused approvals
            if (
                _spendAssetsHandleType == SpendAssetsHandleType.Approve &&
                ERC20(_spendAssets[i]).allowance(_vaultProxy, _adapter) > 0
            ) {
                __approveAssetSpender(_comptrollerProxy, _spendAssets[i], _adapter, 0);
            } else if (_spendAssetsHandleType == SpendAssetsHandleType.None) {
                // Only need to validate _maxSpendAssetAmounts if not SpendAssetsHandleType.Approve
                // or SpendAssetsHandleType.Transfer, as each of those implicitly validate the max
                require(
                    spendAssetAmounts_[i] <= _maxSpendAssetAmounts[i],
                    "__postProcessCoI: Spent amount greater than expected"
                );
            }
        }

        return (incomingAssetAmounts_, spendAssetAmounts_);
    }

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

    /// @notice Gets the `POLICY_MANAGER` variable
    /// @return policyManager_ The `POLICY_MANAGER` variable value
    function getPolicyManager() public view returns (address policyManager_) {
        return POLICY_MANAGER;
    }

    /// @notice Gets the `VALUE_INTERPRETER` variable
    /// @return valueInterpreter_ The `VALUE_INTERPRETER` variable value
    function getValueInterpreter() public view returns (address valueInterpreter_) {
        return VALUE_INTERPRETER;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    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";

/// @title PermissionedVaultActionMixin Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A mixin contract for extensions that can make permissioned vault calls
abstract contract PermissionedVaultActionMixin {
    /// @notice Adds an external position to active external positions
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _externalPosition The external position to be added
    function __addExternalPosition(address _comptrollerProxy, address _externalPosition) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IVault.VaultAction.AddExternalPosition,
            abi.encode(_externalPosition)
        );
    }

    /// @notice Adds a tracked asset
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _asset The asset to add
    function __addTrackedAsset(address _comptrollerProxy, address _asset) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IVault.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(
            IVault.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(
            IVault.VaultAction.BurnShares,
            abi.encode(_target, _amount)
        );
    }

    /// @notice Executes a callOnExternalPosition
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _data The encoded data for the call
    function __callOnExternalPosition(address _comptrollerProxy, bytes memory _data) internal {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IVault.VaultAction.CallOnExternalPosition,
            _data
        );
    }

    /// @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(
            IVault.VaultAction.MintShares,
            abi.encode(_target, _amount)
        );
    }

    /// @notice Removes an external position from the vaultProxy
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _externalPosition The ExternalPosition to remove
    function __removeExternalPosition(address _comptrollerProxy, address _externalPosition)
        internal
    {
        IComptroller(_comptrollerProxy).permissionedVaultAction(
            IVault.VaultAction.RemoveExternalPosition,
            abi.encode(_externalPosition)
        );
    }

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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;
    }
}

{
  "compilationTarget": {
    "contracts/release/extensions/integration-manager/IntegrationManager.sol": "IntegrationManager"
  },
  "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": []
}