// 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 {
    /// @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: 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: 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 <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";
import "../IExtension.sol";

/// @title ExtensionBase Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @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 <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() 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 <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 IComptroller Interface
/// @author Enzyme Council <security@enzyme.finance>
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 <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 IDerivativePriceFeed Interface
/// @author Enzyme Council <security@enzyme.finance>
/// @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: 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 _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 <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 {
    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 <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 identifier() external pure returns (string memory identifier_);

    function parseAssetsForMethod(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, Remove}
}

// 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 {
    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 <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 IPrimitivePriceFeed Interface
/// @author Enzyme Council <security@enzyme.finance>
/// @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 <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/utils/IMigratableVault.sol";

/// @title IVault Interface
/// @author Enzyme Council <security@enzyme.finance>
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 <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/utils/EnumerableSet.sol";
import "../../core/fund/vault/IVault.sol";
import "../../infrastructure/price-feeds/derivatives/IDerivativePriceFeed.sol";
import "../../infrastructure/price-feeds/primitives/IPrimitivePriceFeed.sol";
import "../../utils/AddressArrayLib.sol";
import "../policy-manager/IPolicyManager.sol";
import "../utils/ExtensionBase.sol";
import "../utils/FundDeployerOwnerMixin.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
contract IntegrationManager is
    IIntegrationManager,
    ExtensionBase,
    FundDeployerOwnerMixin,
    PermissionedVaultActionMixin
{
    using AddressArrayLib for address[];
    using EnumerableSet for EnumerableSet.AddressSet;
    using SafeMath for uint256;

    event AdapterDeregistered(address indexed adapter, string indexed identifier);

    event AdapterRegistered(address indexed adapter, string indexed identifier);

    event AuthUserAddedForFund(address indexed comptrollerProxy, address indexed account);

    event AuthUserRemovedForFund(address indexed comptrollerProxy, address indexed account);

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

    address private immutable DERIVATIVE_PRICE_FEED;
    address private immutable POLICY_MANAGER;
    address private immutable PRIMITIVE_PRICE_FEED;

    EnumerableSet.AddressSet private registeredAdapters;

    mapping(address => mapping(address => bool)) private comptrollerProxyToAcctToIsAuthUser;

    constructor(
        address _fundDeployer,
        address _policyManager,
        address _derivativePriceFeed,
        address _primitivePriceFeed
    ) public FundDeployerOwnerMixin(_fundDeployer) {
        DERIVATIVE_PRICE_FEED = _derivativePriceFeed;
        POLICY_MANAGER = _policyManager;
        PRIMITIVE_PRICE_FEED = _primitivePriceFeed;
    }

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

    /// @notice Activates the extension by storing the VaultProxy
    function activateForFund(bool) external override {
        __setValidatedVaultProxy(msg.sender);
    }

    /// @notice Authorizes a user to act on behalf of a fund via the IntegrationManager
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _who The user to authorize
    function addAuthUserForFund(address _comptrollerProxy, address _who) external {
        __validateSetAuthUser(_comptrollerProxy, _who, true);

        comptrollerProxyToAcctToIsAuthUser[_comptrollerProxy][_who] = true;

        emit AuthUserAddedForFund(_comptrollerProxy, _who);
    }

    /// @notice Deactivate the extension by destroying storage
    function deactivateForFund() external override {
        delete comptrollerProxyToVaultProxy[msg.sender];
    }

    /// @notice Removes an authorized user from the IntegrationManager for the given fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _who The authorized user to remove
    function removeAuthUserForFund(address _comptrollerProxy, address _who) external {
        __validateSetAuthUser(_comptrollerProxy, _who, false);

        comptrollerProxyToAcctToIsAuthUser[_comptrollerProxy][_who] = false;

        emit AuthUserRemovedForFund(_comptrollerProxy, _who);
    }

    /// @notice Checks whether an account is an authorized IntegrationManager user for a given fund
    /// @param _comptrollerProxy The ComptrollerProxy of the fund
    /// @param _who The account to check
    /// @return isAuthUser_ True if the account is an authorized user or the fund owner
    function isAuthUserForFund(address _comptrollerProxy, address _who)
        public
        view
        returns (bool isAuthUser_)
    {
        return
            comptrollerProxyToAcctToIsAuthUser[_comptrollerProxy][_who] ||
            _who == IVault(comptrollerProxyToVaultProxy[_comptrollerProxy]).getOwner();
    }

    /// @dev Helper to validate calls to update comptrollerProxyToAcctToIsAuthUser
    function __validateSetAuthUser(
        address _comptrollerProxy,
        address _who,
        bool _nextIsAuthUser
    ) private view {
        require(
            comptrollerProxyToVaultProxy[_comptrollerProxy] != address(0),
            "__validateSetAuthUser: Fund has not been activated"
        );

        address fundOwner = IVault(comptrollerProxyToVaultProxy[_comptrollerProxy]).getOwner();
        require(
            msg.sender == fundOwner,
            "__validateSetAuthUser: Only the fund owner can call this function"
        );
        require(_who != fundOwner, "__validateSetAuthUser: Cannot set for the fund owner");

        if (_nextIsAuthUser) {
            require(
                !comptrollerProxyToAcctToIsAuthUser[_comptrollerProxy][_who],
                "__validateSetAuthUser: Account is already an authorized user"
            );
        } else {
            require(
                comptrollerProxyToAcctToIsAuthUser[_comptrollerProxy][_who],
                "__validateSetAuthUser: Account is not an authorized user"
            );
        }
    }

    ///////////////////////////////
    // 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 {
        // Since we validate and store the ComptrollerProxy-VaultProxy pairing during
        // activateForFund(), this function does not require further validation of the
        // sending ComptrollerProxy
        address vaultProxy = comptrollerProxyToVaultProxy[msg.sender];
        require(vaultProxy != address(0), "receiveCallFromComptroller: Fund is not active");
        require(
            isAuthUserForFund(msg.sender, _caller),
            "receiveCallFromComptroller: Not an authorized user"
        );

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

    /// @dev Adds assets with a zero balance as tracked assets of the fund
    function __addZeroBalanceTrackedAssets(address _vaultProxy, bytes memory _callArgs) private {
        address[] memory assets = abi.decode(_callArgs, (address[]));
        for (uint256 i; i < assets.length; i++) {
            require(
                __isSupportedAsset(assets[i]),
                "__addZeroBalanceTrackedAssets: Unsupported asset"
            );
            require(
                ERC20(assets[i]).balanceOf(_vaultProxy) == 0,
                "__addZeroBalanceTrackedAssets: Balance is not zero"
            );

            __addTrackedAsset(msg.sender, assets[i]);
        }
    }

    /// @dev Removes assets with a zero balance from tracked assets of the fund
    function __removeZeroBalanceTrackedAssets(address _vaultProxy, bytes memory _callArgs)
        private
    {
        address[] memory assets = abi.decode(_callArgs, (address[]));
        address denominationAsset = IComptroller(msg.sender).getDenominationAsset();
        for (uint256 i; i < assets.length; i++) {
            require(
                assets[i] != denominationAsset,
                "__removeZeroBalanceTrackedAssets: Cannot remove denomination asset"
            );
            require(
                ERC20(assets[i]).balanceOf(_vaultProxy) == 0,
                "__removeZeroBalanceTrackedAssets: Balance is not zero"
            );

            __removeTrackedAsset(msg.sender, 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 _vaultProxy The VaultProxy of the fund
    /// @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 msg.sender is the ComptrollerProxy.
    /// Refer to specific adapter to see how to encode its arguments.
    function __callOnIntegration(
        address _caller,
        address _vaultProxy,
        bytes memory _callArgs
    ) private {
        (
            address adapter,
            bytes4 selector,
            bytes memory integrationData
        ) = __decodeCallOnIntegrationArgs(_callArgs);

        __preCoIHook(adapter, selector);

        /// Passing decoded _callArgs leads to stack-too-deep error
        (
            address[] memory incomingAssets,
            uint256[] memory incomingAssetAmounts,
            address[] memory outgoingAssets,
            uint256[] memory outgoingAssetAmounts
        ) = __callOnIntegrationInner(_vaultProxy, _callArgs);

        __postCoIHook(
            adapter,
            selector,
            incomingAssets,
            incomingAssetAmounts,
            outgoingAssets,
            outgoingAssetAmounts
        );

        __emitCoIEvent(
            _vaultProxy,
            _caller,
            adapter,
            selector,
            integrationData,
            incomingAssets,
            incomingAssetAmounts,
            outgoingAssets,
            outgoingAssetAmounts
        );
    }

    /// @dev Helper to execute the bulk of logic of callOnIntegration.
    /// Avoids the stack-too-deep-error.
    function __callOnIntegrationInner(address vaultProxy, bytes memory _callArgs)
        private
        returns (
            address[] memory incomingAssets_,
            uint256[] memory incomingAssetAmounts_,
            address[] memory outgoingAssets_,
            uint256[] memory outgoingAssetAmounts_
        )
    {
        (
            address[] memory expectedIncomingAssets,
            uint256[] memory preCallIncomingAssetBalances,
            uint256[] memory minIncomingAssetAmounts,
            SpendAssetsHandleType spendAssetsHandleType,
            address[] memory spendAssets,
            uint256[] memory maxSpendAssetAmounts,
            uint256[] memory preCallSpendAssetBalances
        ) = __preProcessCoI(vaultProxy, _callArgs);

        __executeCoI(
            vaultProxy,
            _callArgs,
            abi.encode(
                spendAssetsHandleType,
                spendAssets,
                maxSpendAssetAmounts,
                expectedIncomingAssets
            )
        );

        (
            incomingAssets_,
            incomingAssetAmounts_,
            outgoingAssets_,
            outgoingAssetAmounts_
        ) = __postProcessCoI(
            vaultProxy,
            expectedIncomingAssets,
            preCallIncomingAssetBalances,
            minIncomingAssetAmounts,
            spendAssetsHandleType,
            spendAssets,
            maxSpendAssetAmounts,
            preCallSpendAssetBalances
        );

        return (incomingAssets_, incomingAssetAmounts_, outgoingAssets_, outgoingAssetAmounts_);
    }

    /// @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 emit the CallOnIntegrationExecuted event.
    /// Avoids stack-too-deep error.
    function __emitCoIEvent(
        address _vaultProxy,
        address _caller,
        address _adapter,
        bytes4 _selector,
        bytes memory _integrationData,
        address[] memory _incomingAssets,
        uint256[] memory _incomingAssetAmounts,
        address[] memory _outgoingAssets,
        uint256[] memory _outgoingAssetAmounts
    ) private {
        emit CallOnIntegrationExecutedForFund(
            msg.sender,
            _vaultProxy,
            _caller,
            _adapter,
            _selector,
            _integrationData,
            _incomingAssets,
            _incomingAssetAmounts,
            _outgoingAssets,
            _outgoingAssetAmounts
        );
    }

    /// @dev Helper to execute a call to an integration
    /// @dev Avoids stack-too-deep error
    function __executeCoI(
        address _vaultProxy,
        bytes memory _callArgs,
        bytes memory _encodedAssetTransferArgs
    ) private {
        (
            address adapter,
            bytes4 selector,
            bytes memory integrationData
        ) = __decodeCallOnIntegrationArgs(_callArgs);

        (bool success, bytes memory returnData) = adapter.call(
            abi.encodeWithSelector(
                selector,
                _vaultProxy,
                integrationData,
                _encodedAssetTransferArgs
            )
        );
        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 to check if an asset is supported
    function __isSupportedAsset(address _asset) private view returns (bool isSupported_) {
        return
            IPrimitivePriceFeed(PRIMITIVE_PRICE_FEED).isSupportedAsset(_asset) ||
            IDerivativePriceFeed(DERIVATIVE_PRICE_FEED).isSupportedAsset(_asset);
    }

    /// @dev Helper for the actions to take on external contracts prior to executing CoI
    function __preCoIHook(address _adapter, bytes4 _selector) private {
        IPolicyManager(POLICY_MANAGER).validatePolicies(
            msg.sender,
            IPolicyManager.PolicyHook.PreCallOnIntegration,
            abi.encode(_adapter, _selector)
        );
    }

    /// @dev Helper for the internal actions to take prior to executing CoI
    function __preProcessCoI(address _vaultProxy, bytes memory _callArgs)
        private
        returns (
            address[] memory expectedIncomingAssets_,
            uint256[] memory preCallIncomingAssetBalances_,
            uint256[] memory minIncomingAssetAmounts_,
            SpendAssetsHandleType spendAssetsHandleType_,
            address[] memory spendAssets_,
            uint256[] memory maxSpendAssetAmounts_,
            uint256[] memory preCallSpendAssetBalances_
        )
    {
        (
            address adapter,
            bytes4 selector,
            bytes memory integrationData
        ) = __decodeCallOnIntegrationArgs(_callArgs);

        require(adapterIsRegistered(adapter), "callOnIntegration: Adapter is not registered");

        // Note that expected incoming and spend assets are allowed to overlap
        // (e.g., a fee for the incomingAsset charged in a spend asset)
        (
            spendAssetsHandleType_,
            spendAssets_,
            maxSpendAssetAmounts_,
            expectedIncomingAssets_,
            minIncomingAssetAmounts_
        ) = IIntegrationAdapter(adapter).parseAssetsForMethod(selector, integrationData);
        require(
            spendAssets_.length == maxSpendAssetAmounts_.length,
            "__preProcessCoI: Spend assets arrays unequal"
        );
        require(
            expectedIncomingAssets_.length == minIncomingAssetAmounts_.length,
            "__preProcessCoI: Incoming assets arrays unequal"
        );
        require(spendAssets_.isUniqueSet(), "__preProcessCoI: Duplicate spend asset");
        require(
            expectedIncomingAssets_.isUniqueSet(),
            "__preProcessCoI: Duplicate incoming asset"
        );

        IVault vaultProxyContract = IVault(_vaultProxy);

        preCallIncomingAssetBalances_ = new uint256[](expectedIncomingAssets_.length);
        for (uint256 i = 0; i < expectedIncomingAssets_.length; i++) {
            require(
                expectedIncomingAssets_[i] != address(0),
                "__preProcessCoI: Empty incoming asset address"
            );
            require(
                minIncomingAssetAmounts_[i] > 0,
                "__preProcessCoI: minIncomingAssetAmount must be >0"
            );
            require(
                __isSupportedAsset(expectedIncomingAssets_[i]),
                "__preProcessCoI: Non-receivable incoming asset"
            );

            // Get pre-call balance of each incoming asset.
            // If the asset is not tracked by the fund, allow the balance to default to 0.
            if (vaultProxyContract.isTrackedAsset(expectedIncomingAssets_[i])) {
                preCallIncomingAssetBalances_[i] = ERC20(expectedIncomingAssets_[i]).balanceOf(
                    _vaultProxy
                );
            }
        }

        // Get pre-call balances of spend assets and grant approvals to adapter
        preCallSpendAssetBalances_ = new uint256[](spendAssets_.length);
        for (uint256 i = 0; i < spendAssets_.length; i++) {
            require(spendAssets_[i] != address(0), "__preProcessCoI: Empty spend asset");
            require(maxSpendAssetAmounts_[i] > 0, "__preProcessCoI: Empty max spend asset amount");

            // If spend asset is also an incoming asset, no need to record its balance
            if (!expectedIncomingAssets_.contains(spendAssets_[i])) {
                preCallSpendAssetBalances_[i] = ERC20(spendAssets_[i]).balanceOf(_vaultProxy);
            }

            // Grant spend assets access to the adapter.
            // Note that spendAssets_ is already asserted to a unique set.
            if (spendAssetsHandleType_ == SpendAssetsHandleType.Approve) {
                // Use exact approve amount rather than increasing allowances,
                // because all adapters finish their actions atomically.
                __approveAssetSpender(
                    msg.sender,
                    spendAssets_[i],
                    adapter,
                    maxSpendAssetAmounts_[i]
                );
            } else if (spendAssetsHandleType_ == SpendAssetsHandleType.Transfer) {
                __withdrawAssetTo(msg.sender, spendAssets_[i], adapter, maxSpendAssetAmounts_[i]);
            } else if (spendAssetsHandleType_ == SpendAssetsHandleType.Remove) {
                __removeTrackedAsset(msg.sender, spendAssets_[i]);
            }
        }
    }

    /// @dev Helper for the actions to take on external contracts after executing CoI
    function __postCoIHook(
        address _adapter,
        bytes4 _selector,
        address[] memory _incomingAssets,
        uint256[] memory _incomingAssetAmounts,
        address[] memory _outgoingAssets,
        uint256[] memory _outgoingAssetAmounts
    ) private {
        IPolicyManager(POLICY_MANAGER).validatePolicies(
            msg.sender,
            IPolicyManager.PolicyHook.PostCallOnIntegration,
            abi.encode(
                _adapter,
                _selector,
                _incomingAssets,
                _incomingAssetAmounts,
                _outgoingAssets,
                _outgoingAssetAmounts
            )
        );
    }

    /// @dev Helper to reconcile and format incoming and outgoing assets after executing CoI
    function __postProcessCoI(
        address _vaultProxy,
        address[] memory _expectedIncomingAssets,
        uint256[] memory _preCallIncomingAssetBalances,
        uint256[] memory _minIncomingAssetAmounts,
        SpendAssetsHandleType _spendAssetsHandleType,
        address[] memory _spendAssets,
        uint256[] memory _maxSpendAssetAmounts,
        uint256[] memory _preCallSpendAssetBalances
    )
        private
        returns (
            address[] memory incomingAssets_,
            uint256[] memory incomingAssetAmounts_,
            address[] memory outgoingAssets_,
            uint256[] memory outgoingAssetAmounts_
        )
    {
        address[] memory increasedSpendAssets;
        uint256[] memory increasedSpendAssetAmounts;
        (
            outgoingAssets_,
            outgoingAssetAmounts_,
            increasedSpendAssets,
            increasedSpendAssetAmounts
        ) = __reconcileCoISpendAssets(
            _vaultProxy,
            _spendAssetsHandleType,
            _spendAssets,
            _maxSpendAssetAmounts,
            _preCallSpendAssetBalances
        );

        (incomingAssets_, incomingAssetAmounts_) = __reconcileCoIIncomingAssets(
            _vaultProxy,
            _expectedIncomingAssets,
            _preCallIncomingAssetBalances,
            _minIncomingAssetAmounts,
            increasedSpendAssets,
            increasedSpendAssetAmounts
        );

        return (incomingAssets_, incomingAssetAmounts_, outgoingAssets_, outgoingAssetAmounts_);
    }

    /// @dev Helper to process incoming asset balance changes.
    /// See __reconcileCoISpendAssets() for explanation on "increasedSpendAssets".
    function __reconcileCoIIncomingAssets(
        address _vaultProxy,
        address[] memory _expectedIncomingAssets,
        uint256[] memory _preCallIncomingAssetBalances,
        uint256[] memory _minIncomingAssetAmounts,
        address[] memory _increasedSpendAssets,
        uint256[] memory _increasedSpendAssetAmounts
    ) private returns (address[] memory incomingAssets_, uint256[] memory incomingAssetAmounts_) {
        // Incoming assets = expected incoming assets + spend assets with increased balances
        uint256 incomingAssetsCount = _expectedIncomingAssets.length.add(
            _increasedSpendAssets.length
        );

        // Calculate and validate incoming asset amounts
        incomingAssets_ = new address[](incomingAssetsCount);
        incomingAssetAmounts_ = new uint256[](incomingAssetsCount);
        for (uint256 i = 0; i < _expectedIncomingAssets.length; i++) {
            uint256 balanceDiff = __getVaultAssetBalance(_vaultProxy, _expectedIncomingAssets[i])
                .sub(_preCallIncomingAssetBalances[i]);
            require(
                balanceDiff >= _minIncomingAssetAmounts[i],
                "__reconcileCoIAssets: Received incoming asset less than expected"
            );

            // Even if the asset's previous balance was >0, it might not have been tracked
            __addTrackedAsset(msg.sender, _expectedIncomingAssets[i]);

            incomingAssets_[i] = _expectedIncomingAssets[i];
            incomingAssetAmounts_[i] = balanceDiff;
        }

        // Append increaseSpendAssets to incomingAsset vars
        if (_increasedSpendAssets.length > 0) {
            uint256 incomingAssetIndex = _expectedIncomingAssets.length;
            for (uint256 i = 0; i < _increasedSpendAssets.length; i++) {
                incomingAssets_[incomingAssetIndex] = _increasedSpendAssets[i];
                incomingAssetAmounts_[incomingAssetIndex] = _increasedSpendAssetAmounts[i];
                incomingAssetIndex++;
            }
        }

        return (incomingAssets_, incomingAssetAmounts_);
    }

    /// @dev Helper to process spend asset balance changes.
    /// "outgoingAssets" are the spend assets with a decrease in balance.
    /// "increasedSpendAssets" are the spend assets with an unexpected increase in balance.
    /// For example, "increasedSpendAssets" can occur if an adapter has a pre-balance of
    /// the spendAsset, which would be transferred to the fund at the end of the tx.
    function __reconcileCoISpendAssets(
        address _vaultProxy,
        SpendAssetsHandleType _spendAssetsHandleType,
        address[] memory _spendAssets,
        uint256[] memory _maxSpendAssetAmounts,
        uint256[] memory _preCallSpendAssetBalances
    )
        private
        returns (
            address[] memory outgoingAssets_,
            uint256[] memory outgoingAssetAmounts_,
            address[] memory increasedSpendAssets_,
            uint256[] memory increasedSpendAssetAmounts_
        )
    {
        // Determine spend asset balance changes
        uint256[] memory postCallSpendAssetBalances = new uint256[](_spendAssets.length);
        uint256 outgoingAssetsCount;
        uint256 increasedSpendAssetsCount;
        for (uint256 i = 0; i < _spendAssets.length; i++) {
            // If spend asset's initial balance is 0, then it is an incoming asset
            if (_preCallSpendAssetBalances[i] == 0) {
                continue;
            }

            // Handle SpendAssetsHandleType.Remove separately
            if (_spendAssetsHandleType == SpendAssetsHandleType.Remove) {
                outgoingAssetsCount++;
                continue;
            }

            // Determine if the asset is outgoing or incoming, and store the post-balance for later use
            postCallSpendAssetBalances[i] = __getVaultAssetBalance(_vaultProxy, _spendAssets[i]);
            // If the pre- and post- balances are equal, then the asset is neither incoming nor outgoing
            if (postCallSpendAssetBalances[i] < _preCallSpendAssetBalances[i]) {
                outgoingAssetsCount++;
            } else if (postCallSpendAssetBalances[i] > _preCallSpendAssetBalances[i]) {
                increasedSpendAssetsCount++;
            }
        }

        // Format outgoingAssets and increasedSpendAssets (spend assets with unexpected increase in balance)
        outgoingAssets_ = new address[](outgoingAssetsCount);
        outgoingAssetAmounts_ = new uint256[](outgoingAssetsCount);
        increasedSpendAssets_ = new address[](increasedSpendAssetsCount);
        increasedSpendAssetAmounts_ = new uint256[](increasedSpendAssetsCount);
        uint256 outgoingAssetsIndex;
        uint256 increasedSpendAssetsIndex;
        for (uint256 i = 0; i < _spendAssets.length; i++) {
            // If spend asset's initial balance is 0, then it is an incoming asset.
            if (_preCallSpendAssetBalances[i] == 0) {
                continue;
            }

            // Handle SpendAssetsHandleType.Remove separately.
            // No need to validate the max spend asset amount.
            if (_spendAssetsHandleType == SpendAssetsHandleType.Remove) {
                outgoingAssets_[outgoingAssetsIndex] = _spendAssets[i];
                outgoingAssetAmounts_[outgoingAssetsIndex] = _preCallSpendAssetBalances[i];
                outgoingAssetsIndex++;
                continue;
            }

            // If the pre- and post- balances are equal, then the asset is neither incoming nor outgoing
            if (postCallSpendAssetBalances[i] < _preCallSpendAssetBalances[i]) {
                if (postCallSpendAssetBalances[i] == 0) {
                    __removeTrackedAsset(msg.sender, _spendAssets[i]);
                    outgoingAssetAmounts_[outgoingAssetsIndex] = _preCallSpendAssetBalances[i];
                } else {
                    outgoingAssetAmounts_[outgoingAssetsIndex] = _preCallSpendAssetBalances[i].sub(
                        postCallSpendAssetBalances[i]
                    );
                }
                require(
                    outgoingAssetAmounts_[outgoingAssetsIndex] <= _maxSpendAssetAmounts[i],
                    "__reconcileCoISpendAssets: Spent amount greater than expected"
                );

                outgoingAssets_[outgoingAssetsIndex] = _spendAssets[i];
                outgoingAssetsIndex++;
            } else if (postCallSpendAssetBalances[i] > _preCallSpendAssetBalances[i]) {
                increasedSpendAssetAmounts_[increasedSpendAssetsIndex] = postCallSpendAssetBalances[i]
                    .sub(_preCallSpendAssetBalances[i]);
                increasedSpendAssets_[increasedSpendAssetsIndex] = _spendAssets[i];
                increasedSpendAssetsIndex++;
            }
        }

        return (
            outgoingAssets_,
            outgoingAssetAmounts_,
            increasedSpendAssets_,
            increasedSpendAssetAmounts_
        );
    }

    ///////////////////////////
    // INTEGRATIONS REGISTRY //
    ///////////////////////////

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

        for (uint256 i; i < _adapters.length; i++) {
            require(
                adapterIsRegistered(_adapters[i]),
                "deregisterAdapters: Adapter is not registered"
            );

            registeredAdapters.remove(_adapters[i]);

            emit AdapterDeregistered(_adapters[i], IIntegrationAdapter(_adapters[i]).identifier());
        }
    }

    /// @notice Add integration adapters to the list of registered adapters
    /// @param _adapters Addresses of adapters to be registered
    function registerAdapters(address[] calldata _adapters) external onlyFundDeployerOwner {
        require(_adapters.length > 0, "registerAdapters: _adapters cannot be empty");

        for (uint256 i; i < _adapters.length; i++) {
            require(_adapters[i] != address(0), "registerAdapters: Adapter cannot be empty");

            require(
                !adapterIsRegistered(_adapters[i]),
                "registerAdapters: Adapter already registered"
            );

            registeredAdapters.add(_adapters[i]);

            emit AdapterRegistered(_adapters[i], IIntegrationAdapter(_adapters[i]).identifier());
        }
    }

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

    /// @notice Checks if an integration adapter is registered
    /// @param _adapter The adapter to check
    /// @return isRegistered_ True if the adapter is registered
    function adapterIsRegistered(address _adapter) public view returns (bool isRegistered_) {
        return registeredAdapters.contains(_adapter);
    }

    /// @notice Gets the `DERIVATIVE_PRICE_FEED` variable
    /// @return derivativePriceFeed_ The `DERIVATIVE_PRICE_FEED` variable value
    function getDerivativePriceFeed() external view returns (address derivativePriceFeed_) {
        return DERIVATIVE_PRICE_FEED;
    }

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

    /// @notice Gets the `PRIMITIVE_PRICE_FEED` variable
    /// @return primitivePriceFeed_ The `PRIMITIVE_PRICE_FEED` variable value
    function getPrimitivePriceFeed() external view returns (address primitivePriceFeed_) {
        return PRIMITIVE_PRICE_FEED;
    }

    /// @notice Gets all registered integration adapters
    /// @return registeredAdaptersArray_ A list of all registered integration adapters
    function getRegisteredAdapters()
        external
        view
        returns (address[] memory registeredAdaptersArray_)
    {
        registeredAdaptersArray_ = new address[](registeredAdapters.length());
        for (uint256 i = 0; i < registeredAdaptersArray_.length; i++) {
            registeredAdaptersArray_[i] = registeredAdapters.at(i);
        }

        return registeredAdaptersArray_;
    }
}

// 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";

/// @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 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: 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": []
}