pragma solidity 0.8.2;


interface ISavingsContractV2 {
    // DEPRECATED but still backwards compatible
    function redeem(uint256 _amount) external returns (uint256 massetReturned);

    function creditBalances(address) external view returns (uint256); // V1 & V2 (use balanceOf)

    // --------------------------------------------

    function depositInterest(uint256 _amount) external; // V1 & V2

    function depositSavings(uint256 _amount) external returns (uint256 creditsIssued); // V1 & V2

    function depositSavings(uint256 _amount, address _beneficiary)
        external
        returns (uint256 creditsIssued); // V2

    function redeemCredits(uint256 _amount) external returns (uint256 underlyingReturned); // V2

    function redeemUnderlying(uint256 _amount) external returns (uint256 creditsBurned); // V2

    function exchangeRate() external view returns (uint256); // V1 & V2

    function balanceOfUnderlying(address _user) external view returns (uint256 balance); // V2

    function underlyingToCredits(uint256 _credits) external view returns (uint256 underlying); // V2

    function creditsToUnderlying(uint256 _underlying) external view returns (uint256 credits); // V2
}

struct BassetPersonal {
    // Address of the bAsset
    address addr;
    // Address of the bAsset
    address integrator;
    // An ERC20 can charge transfer fee, for example USDT, DGX tokens.
    bool hasTxFee; // takes a byte in storage
    // Status of the bAsset
    BassetStatus status;
}

struct BassetData {
    // 1 Basset * ratio / ratioScale == x Masset (relative value)
    // If ratio == 10e8 then 1 bAsset = 10 mAssets
    // A ratio is divised as 10^(18-tokenDecimals) * measurementMultiple(relative value of 1 base unit)
    uint128 ratio;
    // Amount of the Basset that is held in Collateral
    uint128 vaultBalance;
}

abstract contract IMasset {
    // Mint
    function mint(
        address _input,
        uint256 _inputQuantity,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 mintOutput);

    function mintMulti(
        address[] calldata _inputs,
        uint256[] calldata _inputQuantities,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 mintOutput);

    function getMintOutput(address _input, uint256 _inputQuantity)
        external
        view
        virtual
        returns (uint256 mintOutput);

    function getMintMultiOutput(address[] calldata _inputs, uint256[] calldata _inputQuantities)
        external
        view
        virtual
        returns (uint256 mintOutput);

    // Swaps
    function swap(
        address _input,
        address _output,
        uint256 _inputQuantity,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 swapOutput);

    function getSwapOutput(
        address _input,
        address _output,
        uint256 _inputQuantity
    ) external view virtual returns (uint256 swapOutput);

    // Redemption
    function redeem(
        address _output,
        uint256 _mAssetQuantity,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 outputQuantity);

    function redeemMasset(
        uint256 _mAssetQuantity,
        uint256[] calldata _minOutputQuantities,
        address _recipient
    ) external virtual returns (uint256[] memory outputQuantities);

    function redeemExactBassets(
        address[] calldata _outputs,
        uint256[] calldata _outputQuantities,
        uint256 _maxMassetQuantity,
        address _recipient
    ) external virtual returns (uint256 mAssetRedeemed);

    function getRedeemOutput(address _output, uint256 _mAssetQuantity)
        external
        view
        virtual
        returns (uint256 bAssetOutput);

    function getRedeemExactBassetsOutput(
        address[] calldata _outputs,
        uint256[] calldata _outputQuantities
    ) external view virtual returns (uint256 mAssetAmount);

    // Views
    function getBasket() external view virtual returns (bool, bool);

    function getBasset(address _token)
        external
        view
        virtual
        returns (BassetPersonal memory personal, BassetData memory data);

    function getBassets()
        external
        view
        virtual
        returns (BassetPersonal[] memory personal, BassetData[] memory data);

    function bAssetIndexes(address) external view virtual returns (uint8);

    // SavingsManager
    function collectInterest() external virtual returns (uint256 swapFeesGained, uint256 newSupply);

    function collectPlatformInterest()
        external
        virtual
        returns (uint256 mintAmount, uint256 newSupply);

    // Admin
    function setCacheSize(uint256 _cacheSize) external virtual;

    function upgradeForgeValidator(address _newForgeValidator) external virtual;

    function setFees(uint256 _swapFee, uint256 _redemptionFee) external virtual;

    function setTransferFeesFlag(address _bAsset, bool _flag) external virtual;

    function migrateBassets(address[] calldata _bAssets, address _newIntegration) external virtual;
}

// Status of the Basset - has it broken its peg?
enum BassetStatus {
    Default,
    Normal,
    BrokenBelowPeg,
    BrokenAbovePeg,
    Blacklisted,
    Liquidating,
    Liquidated,
    Failed
}

struct BasketState {
    bool undergoingRecol;
    bool failed;
}

struct InvariantConfig {
    uint256 a;
    WeightLimits limits;
}

struct WeightLimits {
    uint128 min;
    uint128 max;
}

struct FeederConfig {
    uint256 supply;
    uint256 a;
    WeightLimits limits;
}

struct AmpData {
    uint64 initialA;
    uint64 targetA;
    uint64 rampStartTime;
    uint64 rampEndTime;
}

struct FeederData {
    uint256 swapFee;
    uint256 redemptionFee;
    uint256 govFee;
    uint256 pendingFees;
    uint256 cacheSize;
    BassetPersonal[] bAssetPersonal;
    BassetData[] bAssetData;
    AmpData ampData;
    WeightLimits weightLimits;
}

struct AssetData {
    uint8 idx;
    uint256 amt;
    BassetPersonal personal;
}

struct Asset {
    uint8 idx;
    address addr;
    bool exists;
}

abstract contract IFeederPool {
    // Mint
    function mint(
        address _input,
        uint256 _inputQuantity,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 mintOutput);

    function mintMulti(
        address[] calldata _inputs,
        uint256[] calldata _inputQuantities,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 mintOutput);

    function getMintOutput(address _input, uint256 _inputQuantity)
        external
        view
        virtual
        returns (uint256 mintOutput);

    function getMintMultiOutput(address[] calldata _inputs, uint256[] calldata _inputQuantities)
        external
        view
        virtual
        returns (uint256 mintOutput);

    // Swaps
    function swap(
        address _input,
        address _output,
        uint256 _inputQuantity,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 swapOutput);

    function getSwapOutput(
        address _input,
        address _output,
        uint256 _inputQuantity
    ) external view virtual returns (uint256 swapOutput);

    // Redemption
    function redeem(
        address _output,
        uint256 _fpTokenQuantity,
        uint256 _minOutputQuantity,
        address _recipient
    ) external virtual returns (uint256 outputQuantity);

    function redeemProportionately(
        uint256 _fpTokenQuantity,
        uint256[] calldata _minOutputQuantities,
        address _recipient
    ) external virtual returns (uint256[] memory outputQuantities);

    function redeemExactBassets(
        address[] calldata _outputs,
        uint256[] calldata _outputQuantities,
        uint256 _maxMassetQuantity,
        address _recipient
    ) external virtual returns (uint256 mAssetRedeemed);

    function getRedeemOutput(address _output, uint256 _fpTokenQuantity)
        external
        view
        virtual
        returns (uint256 bAssetOutput);

    function getRedeemExactBassetsOutput(
        address[] calldata _outputs,
        uint256[] calldata _outputQuantities
    ) external view virtual returns (uint256 mAssetAmount);

    // Views
    function mAsset() external view virtual returns (address);

    function getPrice() public view virtual returns (uint256 price, uint256 k);

    function getConfig() external view virtual returns (FeederConfig memory config);

    function getBasset(address _token)
        external
        view
        virtual
        returns (BassetPersonal memory personal, BassetData memory data);

    function getBassets()
        external
        view
        virtual
        returns (BassetPersonal[] memory personal, BassetData[] memory data);

    // SavingsManager
    function collectPlatformInterest()
        external
        virtual
        returns (uint256 mintAmount, uint256 newSupply);

    function collectPendingFees() external virtual;
}

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);
}

interface IBoostedVaultWithLockup {
    /**
     * @dev Stakes a given amount of the StakingToken for the sender
     * @param _amount Units of StakingToken
     */
    function stake(uint256 _amount) external;

    /**
     * @dev Stakes a given amount of the StakingToken for a given beneficiary
     * @param _beneficiary Staked tokens are credited to this address
     * @param _amount      Units of StakingToken
     */
    function stake(address _beneficiary, uint256 _amount) external;

    /**
     * @dev Withdraws stake from pool and claims any unlocked rewards.
     * Note, this function is costly - the args for _claimRewards
     * should be determined off chain and then passed to other fn
     */
    function exit() external;

    /**
     * @dev Withdraws stake from pool and claims any unlocked rewards.
     * @param _first    Index of the first array element to claim
     * @param _last     Index of the last array element to claim
     */
    function exit(uint256 _first, uint256 _last) external;

    /**
     * @dev Withdraws given stake amount from the pool
     * @param _amount Units of the staked token to withdraw
     */
    function withdraw(uint256 _amount) external;

    /**
     * @dev Claims only the tokens that have been immediately unlocked, not including
     * those that are in the lockers.
     */
    function claimReward() external;

    /**
     * @dev Claims all unlocked rewards for sender.
     * Note, this function is costly - the args for _claimRewards
     * should be determined off chain and then passed to other fn
     */
    function claimRewards() external;

    /**
     * @dev Claims all unlocked rewards for sender. Both immediately unlocked
     * rewards and also locked rewards past their time lock.
     * @param _first    Index of the first array element to claim
     * @param _last     Index of the last array element to claim
     */
    function claimRewards(uint256 _first, uint256 _last) external;

    /**
     * @dev Pokes a given account to reset the boost
     */
    function pokeBoost(address _account) external;

    /**
     * @dev Gets the last applicable timestamp for this reward period
     */
    function lastTimeRewardApplicable() external view returns (uint256);

    /**
     * @dev Calculates the amount of unclaimed rewards per token since last update,
     * and sums with stored to give the new cumulative reward per token
     * @return 'Reward' per staked token
     */
    function rewardPerToken() external view returns (uint256);

    /**
     * @dev Returned the units of IMMEDIATELY claimable rewards a user has to receive. Note - this
     * does NOT include the majority of rewards which will be locked up.
     * @param _account User address
     * @return Total reward amount earned
     */
    function earned(address _account) external view returns (uint256);

    /**
     * @dev Calculates all unclaimed reward data, finding both immediately unlocked rewards
     * and those that have passed their time lock.
     * @param _account User address
     * @return amount Total units of unclaimed rewards
     * @return first Index of the first userReward that has unlocked
     * @return last Index of the last userReward that has unlocked
     */
    function unclaimedRewards(address _account)
        external
        view
        returns (
            uint256 amount,
            uint256 first,
            uint256 last
        );
}


/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */

/**
 * @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);
            }
        }
    }
}

library SafeERC20 {
    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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(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");
        }
    }
}

// FLOWS
// 0 - fAsset/mAsset/mpAsset    -> FeederPool BoostedVault
// 1 - fAssets/mAssets/mpAssets -> FeederPool BoostedVault
contract FeederWrapper is Ownable {
    using SafeERC20 for IERC20;

    /**
     * @dev 0. fAsset/mAsset/mpAsset -> FeederPool BoostedVault
     * @param  _feeder             FeederPool address
     * @param  _vault              BoostedVault address (with stakingToken of `_feeder`)
     * @param  _input              Input address; fAsset, mAsset or mpAsset
     * @param  _inputQuantity      Quantity of input sent
     * @param  _minOutputQuantity  Min amount of fpToken to be minted and staked
     */
    function mintAndStake(
        address _feeder,
        address _vault,
        address _input,
        uint256 _inputQuantity,
        uint256 _minOutputQuantity
    ) external {
        // 0. Transfer the asset here
        IERC20(_input).safeTransferFrom(msg.sender, address(this), _inputQuantity);

        // 1. Mint the fpToken and transfer here
        uint256 fpTokenAmt =
            IFeederPool(_feeder).mint(_input, _inputQuantity, _minOutputQuantity, address(this));

        // 2. Stake the fpToken in the BoostedVault on behalf of sender
        IBoostedVaultWithLockup(_vault).stake(msg.sender, fpTokenAmt);
    }

    /**
     * @dev 1. fAssets/mAssets/mpAssets -> FeederPool BoostedVault
     * @param _feeder             FeederPool address
     * @param _vault              BoostedVault address (with stakingToken of `_feeder`)
     * @param _inputs             Input addresses; fAsset, mAsset or mpAsset
     * @param _inputQuantities    Quantity of input sent
     * @param _minOutputQuantity  Min amount of fpToken to be minted and staked
     */
    function mintMultiAndStake(
        address _feeder,
        address _vault,
        address[] calldata _inputs,
        uint256[] calldata _inputQuantities,
        uint256 _minOutputQuantity
    ) external {
        require(_inputs.length == _inputQuantities.length, "Mismatching inputs");

        // 0. Transfer the assets here
        for (uint256 i = 0; i < _inputs.length; i++) {
            IERC20(_inputs[i]).safeTransferFrom(msg.sender, address(this), _inputQuantities[i]);
        }

        // 1. Mint the fpToken and transfer here
        uint256 fpTokenAmt =
            IFeederPool(_feeder).mintMulti(
                _inputs,
                _inputQuantities,
                _minOutputQuantity,
                address(this)
            );

        // 2. Stake the fpToken in the BoostedVault on behalf of sender
        IBoostedVaultWithLockup(_vault).stake(msg.sender, fpTokenAmt);
    }

    /**
     * @dev Approve vault and multiple assets
     */
    function approve(
        address _feeder,
        address _vault,
        address[] calldata _assets
    ) external onlyOwner {
        _approve(_feeder, _vault);
        _approve(_assets, _feeder);
    }

    /**
     * @dev Approve one token/spender
     */
    function approve(address _token, address _spender) external onlyOwner {
        _approve(_token, _spender);
    }

    /**
     * @dev Approve multiple tokens/one spender
     */
    function approve(address[] calldata _tokens, address _spender) external onlyOwner {
        _approve(_tokens, _spender);
    }

    function _approve(address _token, address _spender) internal {
        require(_spender != address(0), "Invalid spender");
        require(_token != address(0), "Invalid token");
        IERC20(_token).safeApprove(_spender, 2**256 - 1);
    }

    function _approve(address[] calldata _tokens, address _spender) internal {
        require(_spender != address(0), "Invalid spender");
        for (uint256 i = 0; i < _tokens.length; i++) {
            require(_tokens[i] != address(0), "Invalid token");
            IERC20(_tokens[i]).safeApprove(_spender, 2**256 - 1);
        }
    }
}