// File: @yield-protocol/vault-v2/contracts/other/notional/NotionalJoin.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.6;

import "@yield-protocol/vault-interfaces/IJoin.sol";
import "@yield-protocol/utils-v2/contracts/token/IERC20.sol";
import "@yield-protocol/utils-v2/contracts/token/MinimalTransferHelper.sol";
import "@yield-protocol/utils-v2/contracts/access/AccessControl.sol";
import "@yield-protocol/utils-v2/contracts/math/WMul.sol";
import "@yield-protocol/utils-v2/contracts/math/WDiv.sol";
import "@yield-protocol/utils-v2/contracts/cast/CastU256U128.sol";
import "./IBatchAction.sol";
import "./ERC1155.sol";

contract NotionalJoin is IJoin, ERC1155TokenReceiver, AccessControl() {
    using WMul for uint256;
    using WDiv for uint256;
    using CastU256U128 for uint256;

    event FlashFeeFactorSet(uint256 indexed fee);
    event Redeemed(uint256 fCash, uint256 underlying, uint256 accrual);

    bytes32 constant internal FLASH_LOAN_RETURN = keccak256("ERC3156FlashBorrower.onFlashLoan");
    uint256 constant public FLASH_LOANS_DISABLED = type(uint256).max;

    address public immutable override asset;
    address public immutable underlying;
    uint40 public immutable maturity;    // Maturity date for fCash
    uint16 public immutable currencyId;  // Notional currency id for the underlying
    uint256 public immutable id;         // This ERC1155 Join only accepts one id from the ERC1155 token
    uint256 public storedBalance;        // After maturity, this is reused as the balance for underlying
    uint256 public accrual;              // fCash to underlying factor, with 18 decimals
    uint256 public flashFeeFactor = FLASH_LOANS_DISABLED; // Fee on flash loans, as a percentage in fixed point with 18 decimals. Flash loans disabled by default.

    constructor(address asset_, address underlying_, uint40 maturity_, uint16 currencyId_) {
        asset = asset_;
        underlying = underlying_;
        maturity = maturity_;
        currencyId = currencyId_;

        // TransferAssets.encodeAssetId
        id = uint256(
            (bytes32(uint256(currencyId_)) << 48) |
            (bytes32(uint256(maturity_)) << 8) |
            bytes32(uint256(1))
        );
    }

    modifier afterMaturity() {
        require(
            block.timestamp >= maturity,
            "Only after maturity"
        );
        _;
    }

    modifier beforeMaturity() {
        require(
            block.timestamp < maturity,
            "Only before maturity"
        );
        _;
    }

    /// @dev Advertising through ERC165 the available functions
    function supportsInterface(bytes4 interfaceID) external view returns (bool) {
        // ERC-165 support = `bytes4(keccak256('supportsInterface(bytes4)'))`.
        // ERC-1155 `ERC1155TokenReceiver` support = `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)")) ^ bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`.
        return  interfaceID == NotionalJoin.supportsInterface.selector ||
                interfaceID == ERC1155TokenReceiver.onERC1155Received.selector ^ ERC1155TokenReceiver.onERC1155BatchReceived.selector;
    }

    /// @dev Called by the sender after a transfer to verify it was received. Ensures only `id` tokens are received.
    function onERC1155Received(
        address,
        address,
        uint256 _id,
        uint256,
        bytes calldata 
    ) external override returns(bytes4) {
        require (_id == id, "Token id not accepted");
        return ERC1155TokenReceiver.onERC1155Received.selector;
    }

    /// @dev Called by the sender after a batch transfer to verify it was received. Ensures only `id` tokens are received.
    function onERC1155BatchReceived(
        address,
        address,
        uint256[] calldata _ids,
        uint256[] calldata,
        bytes calldata
    ) external override returns(bytes4) {
        uint256 length = _ids.length;
        for (uint256 i; i < length; ++i)
            require (_ids[i] == id, "Token id not accepted");
        return ERC1155TokenReceiver.onERC1155BatchReceived.selector;
    }

    /// @dev Take `amount` `asset` from `user` using `transferFrom`, minus any unaccounted `asset` in this contract.
    function join(address user, uint128 amount)
        external override
        auth
        returns (uint128)
    {
        return _join(user, amount);
    }

    /// @dev Take `amount` `asset` from `user` using `transferFrom`, minus any unaccounted `asset` in this contract.
    function _join(address user, uint128 amount)
        internal
        beforeMaturity
        returns (uint128)
    {
        ERC1155 token = ERC1155(asset);
        uint256 _storedBalance = storedBalance;
        uint256 available = token.balanceOf(address(this), id) - _storedBalance; // Fine to panic if this underflows
        
        unchecked {
            storedBalance = _storedBalance + amount;    // Unlikely that a uint128 added to the stored balance will make it overflow
            if (available < amount) token.safeTransferFrom(user, address(this), id, amount - available, "");
        }
        return amount;        
    }

    /// @dev Before maturity, transfer `amount` `asset` to `user`.
    /// After maturity, withdraw if necessary, then transfer `amount.wmul(accrual)` `underlying` to `user`.
    function exit(address user, uint128 amount)
        external override
        auth
        returns (uint128)
    {
        if (block.timestamp < maturity) {
            return _exit(user, amount);
        } else {
            if (accrual == 0) redeem(); // Redeem all fCash, switch to underlying join, set accrual.
            return _exitUnderlying(user, uint256(amount).wmul(accrual).u128());
        }
    }

    /// @dev Transfer `amount` `asset` to `user`
    function _exit(address user, uint128 amount)
        internal
        beforeMaturity
        returns (uint128)
    {
        storedBalance -= amount;
        ERC1155(asset).safeTransferFrom(address(this), user, id, amount, "");
        return amount;
    }

    /// @dev Transfer `amount` `underlying` to `user`
    function _exitUnderlying(address user, uint128 amount)
        internal
        afterMaturity
        returns (uint128)
    {
        storedBalance -= amount;
        MinimalTransferHelper.safeTransfer(IERC20(underlying), user, amount);
        return amount;
    }

    /// @dev Switch to an exit-only underlying Join, converting all fCash holdings to underlying in the process.
    function redeem()
        public
        afterMaturity
    {
        require (accrual == 0, "Already redeemed");

        // Build an action to withdraw all mature fCash into underlying, then withdraw.
        IBatchAction.BalanceAction[] memory withdrawActions = new IBatchAction.BalanceAction[](1);
        withdrawActions[0] = IBatchAction.BalanceAction({
            actionType: IBatchAction.DepositActionType.None,
            currencyId: currencyId,
            depositActionAmount: 0,
            withdrawAmountInternalPrecision: 0,
            withdrawEntireCashBalance: true,
            redeemToUnderlying: true
        });

        IBatchAction(asset).batchBalanceAction(address(this), withdrawActions);

        uint256 underlyingBalance = IERC20(underlying).balanceOf(address(this));
        uint256 storedBalance_ = storedBalance;
        accrual = underlyingBalance.wdiv(storedBalance_); // There is a rounding loss here. Some wei will be forever locked in the join.
        // This becomes now to an exit-only underlying Join.
        storedBalance = underlyingBalance;

        emit Redeemed(storedBalance_, underlyingBalance, accrual);
    }

    /// @dev Retrieve any ERC20 tokens. Useful for airdropped tokens.
    function retrieve(IERC20 token, address to)
        external
        auth
    {
        require(address(token) != address(underlying), "Use exit for underlying");
        MinimalTransferHelper.safeTransfer(token, to, token.balanceOf(address(this)));
    }
    
    /// @dev Retrieve any ERC1155 tokens other than the `asset`. Useful for airdropped tokens.
    function retrieveERC1155(ERC1155 token, uint256 id_, address to)
        external
        auth
    {
        require(address(token) != address(asset) || id_ != id, "Use exit for asset");
        token.safeTransferFrom(address(this), to, id_, token.balanceOf(address(this), id_), "");
    }
}
// File: @yield-protocol/vault-interfaces/IJoin.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@yield-protocol/utils-v2/contracts/token/IERC20.sol";

interface IJoin {
    /// @dev asset managed by this contract
    function asset() external view returns (address);

    /// @dev Add tokens to this contract.
    function join(address user, uint128 wad) external returns (uint128);

    /// @dev Remove tokens to this contract.
    function exit(address user, uint128 wad) external returns (uint128);
}

// File: @yield-protocol/utils-v2/contracts/token/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^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);
}
// File: @yield-protocol/utils-v2/contracts/token/MinimalTransferHelper.sol



// SPDX-License-Identifier: MIT
// Taken from https://github.com/Uniswap/uniswap-lib/blob/master/contracts/libraries/TransferHelper.sol

pragma solidity >=0.6.0;

import "./IERC20.sol";
import "../utils/RevertMsgExtractor.sol";


// helper methods for transferring ERC20 tokens that do not consistently return true/false
library MinimalTransferHelper {
    /// @notice Transfers tokens from msg.sender to a recipient
    /// @dev Errors with the underlying revert message if transfer fails
    /// @param token The contract address of the token which will be transferred
    /// @param to The recipient of the transfer
    /// @param value The value of the transfer
    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        if (!(success && (data.length == 0 || abi.decode(data, (bool))))) revert(RevertMsgExtractor.getRevertMsg(data));
    }
}
// File: @yield-protocol/utils-v2/contracts/access/AccessControl.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes4` identifier. These are expected to be the 
 * signatures for all the functions in the contract. Special roles should be exposed
 * in the external API and be unique:
 *
 * ```
 * bytes4 public constant ROOT = 0x00000000;
 * ```
 *
 * Roles represent restricted access to a function call. For that purpose, use {auth}:
 *
 * ```
 * function foo() public auth {
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `ROOT`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {setRoleAdmin}.
 *
 * WARNING: The `ROOT` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
contract AccessControl {
    struct RoleData {
        mapping (address => bool) members;
        bytes4 adminRole;
    }

    mapping (bytes4 => RoleData) private _roles;

    bytes4 public constant ROOT = 0x00000000;
    bytes4 public constant ROOT4146650865 = 0x00000000; // Collision protection for ROOT, test with ROOT12007226833()
    bytes4 public constant LOCK = 0xFFFFFFFF;           // Used to disable further permissioning of a function
    bytes4 public constant LOCK8605463013 = 0xFFFFFFFF; // Collision protection for LOCK, test with LOCK10462387368()

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role
     *
     * `ROOT` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes4 indexed role, bytes4 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call.
     */
    event RoleGranted(bytes4 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes4 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Give msg.sender the ROOT role and create a LOCK role with itself as the admin role and no members. 
     * Calling setRoleAdmin(msg.sig, LOCK) means no one can grant that msg.sig role anymore.
     */
    constructor () {
        _grantRole(ROOT, msg.sender);   // Grant ROOT to msg.sender
        _setRoleAdmin(LOCK, LOCK);      // Create the LOCK role by setting itself as its own admin, creating an independent role tree
    }

    /**
     * @dev Each function in the contract has its own role, identified by their msg.sig signature.
     * ROOT can give and remove access to each function, lock any further access being granted to
     * a specific action, or even create other roles to delegate admin control over a function.
     */
    modifier auth() {
        require (_hasRole(msg.sig, msg.sender), "Access denied");
        _;
    }

    /**
     * @dev Allow only if the caller has been granted the admin role of `role`.
     */
    modifier admin(bytes4 role) {
        require (_hasRole(_getRoleAdmin(role), msg.sender), "Only admin");
        _;
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes4 role, address account) external view returns (bool) {
        return _hasRole(role, account);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes4 role) external view returns (bytes4) {
        return _getRoleAdmin(role);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.

     * If ``role``'s admin role is not `adminRole` emits a {RoleAdminChanged} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function setRoleAdmin(bytes4 role, bytes4 adminRole) external virtual admin(role) {
        _setRoleAdmin(role, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes4 role, address account) external virtual admin(role) {
        _grantRole(role, account);
    }

    
    /**
     * @dev Grants all of `role` in `roles` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - For each `role` in `roles`, the caller must have ``role``'s admin role.
     */
    function grantRoles(bytes4[] memory roles, address account) external virtual {
        for (uint256 i = 0; i < roles.length; i++) {
            require (_hasRole(_getRoleAdmin(roles[i]), msg.sender), "Only admin");
            _grantRole(roles[i], account);
        }
    }

    /**
     * @dev Sets LOCK as ``role``'s admin role. LOCK has no members, so this disables admin management of ``role``.

     * Emits a {RoleAdminChanged} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function lockRole(bytes4 role) external virtual admin(role) {
        _setRoleAdmin(role, LOCK);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes4 role, address account) external virtual admin(role) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes all of `role` in `roles` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - For each `role` in `roles`, the caller must have ``role``'s admin role.
     */
    function revokeRoles(bytes4[] memory roles, address account) external virtual {
        for (uint256 i = 0; i < roles.length; i++) {
            require (_hasRole(_getRoleAdmin(roles[i]), msg.sender), "Only admin");
            _revokeRole(roles[i], account);
        }
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes4 role, address account) external virtual {
        require(account == msg.sender, "Renounce only for self");

        _revokeRole(role, account);
    }

    function _hasRole(bytes4 role, address account) internal view returns (bool) {
        return _roles[role].members[account];
    }

    function _getRoleAdmin(bytes4 role) internal view returns (bytes4) {
        return _roles[role].adminRole;
    }

    function _setRoleAdmin(bytes4 role, bytes4 adminRole) internal virtual {
        if (_getRoleAdmin(role) != adminRole) {
            _roles[role].adminRole = adminRole;
            emit RoleAdminChanged(role, adminRole);
        }
    }

    function _grantRole(bytes4 role, address account) internal {
        if (!_hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, msg.sender);
        }
    }

    function _revokeRole(bytes4 role, address account) internal {
        if (_hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, msg.sender);
        }
    }
}
// File: @yield-protocol/utils-v2/contracts/math/WMul.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;


library WMul {
    // Taken from https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol
    /// @dev Multiply an amount by a fixed point factor with 18 decimals, rounds down.
    function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x * y;
        unchecked { z /= 1e18; }
    }
}
// File: @yield-protocol/utils-v2/contracts/math/WDiv.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;


library WDiv { // Fixed point arithmetic in 18 decimal units
    // Taken from https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol
    /// @dev Divide an amount by a fixed point factor with 18 decimals
    function wdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = (x * 1e18) / y;
    }
}
// File: @yield-protocol/utils-v2/contracts/cast/CastU256U128.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;


library CastU256U128 {
    /// @dev Safely cast an uint256 to an uint128
    function u128(uint256 x) internal pure returns (uint128 y) {
        require (x <= type(uint128).max, "Cast overflow");
        y = uint128(x);
    }
}
// File: @yield-protocol/vault-v2/contracts/other/notional/IBatchAction.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.6;

interface IBatchAction {
    /// @notice Specifies different deposit actions that can occur during BalanceAction or BalanceActionWithTrades
    enum DepositActionType {
        // No deposit action
        None,
        // Deposit asset cash, depositActionAmount is specified in asset cash external precision
        DepositAsset,
        // Deposit underlying tokens that are mintable to asset cash, depositActionAmount is specified in underlying token
        // external precision
        DepositUnderlying,
        // Deposits specified asset cash external precision amount into an nToken and mints the corresponding amount of
        // nTokens into the account
        DepositAssetAndMintNToken,
        // Deposits specified underlying in external precision, mints asset cash, and uses that asset cash to mint nTokens
        DepositUnderlyingAndMintNToken,
        // Redeems an nToken balance to asset cash. depositActionAmount is specified in nToken precision. Considered a deposit action
        // because it deposits asset cash into an account. If there are fCash residuals that cannot be sold off, will revert.
        RedeemNToken,
        // Converts specified amount of asset cash balance already in Notional to nTokens. depositActionAmount is specified in
        // Notional internal 8 decimal precision.
        ConvertCashToNToken
    }
    /// @notice Defines a balance action for batchAction
    struct BalanceAction {
        // Deposit action to take (if any)
        DepositActionType actionType;
        uint16 currencyId;
        // Deposit action amount must correspond to the depositActionType, see documentation above.
        uint256 depositActionAmount;
        // Withdraw an amount of asset cash specified in Notional internal 8 decimal precision
        uint256 withdrawAmountInternalPrecision;
        // If set to true, will withdraw entire cash balance. Useful if there may be an unknown amount of asset cash
        // residual left from trading.
        bool withdrawEntireCashBalance;
        // If set to true, will redeem asset cash to the underlying token on withdraw.
        bool redeemToUnderlying;
    }

    /// @notice Executes a batch of balance transfers including minting and redeeming nTokens.
    /// @param account the account for the action
    /// @param actions array of balance actions to take, must be sorted by currency id
    function batchBalanceAction(address account, BalanceAction[] calldata actions) external;
}
// File: @yield-protocol/vault-v2/contracts/other/notional/ERC1155.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Minimalist and gas efficient standard ERC1155 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC1155.sol)
abstract contract ERC1155 {
    /*///////////////////////////////////////////////////////////////
                                EVENTS
    //////////////////////////////////////////////////////////////*/

    event TransferSingle(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256 id,
        uint256 amount
    );

    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] amounts
    );

    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    event URI(string value, uint256 indexed id);

    /*///////////////////////////////////////////////////////////////
                            ERC1155 STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(address => mapping(uint256 => uint256)) public balanceOf;

    mapping(address => mapping(address => bool)) public isApprovedForAll;

    /*///////////////////////////////////////////////////////////////
                             METADATA LOGIC
    //////////////////////////////////////////////////////////////*/

    function uri(uint256 id) public view virtual returns (string memory);

    /*///////////////////////////////////////////////////////////////
                             ERC1155 LOGIC
    //////////////////////////////////////////////////////////////*/

    function setApprovalForAll(address operator, bool approved) public virtual {
        isApprovedForAll[msg.sender][operator] = approved;

        emit ApprovalForAll(msg.sender, operator, approved);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual {
        require(msg.sender == from || isApprovedForAll[from][msg.sender], "NOT_AUTHORIZED");

        balanceOf[from][id] -= amount;
        balanceOf[to][id] += amount;

        emit TransferSingle(msg.sender, from, to, id, amount);

        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155Received(msg.sender, from, id, amount, data) ==
                    ERC1155TokenReceiver.onERC1155Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual {
        uint256 idsLength = ids.length; // Saves MLOADs.

        require(idsLength == amounts.length, "LENGTH_MISMATCH");

        require(msg.sender == from || isApprovedForAll[from][msg.sender], "NOT_AUTHORIZED");

        for (uint256 i = 0; i < idsLength; ) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            balanceOf[from][id] -= amount;
            balanceOf[to][id] += amount;

            // An array can't have a total length
            // larger than the max uint256 value.
            unchecked {
                i++;
            }
        }

        emit TransferBatch(msg.sender, from, to, ids, amounts);

        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155BatchReceived(msg.sender, from, ids, amounts, data) ==
                    ERC1155TokenReceiver.onERC1155BatchReceived.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    function balanceOfBatch(address[] memory owners, uint256[] memory ids)
        public
        view
        virtual
        returns (uint256[] memory balances)
    {
        uint256 ownersLength = owners.length; // Saves MLOADs.

        require(ownersLength == ids.length, "LENGTH_MISMATCH");

        balances = new uint256[](owners.length);

        // Unchecked because the only math done is incrementing
        // the array index counter which cannot possibly overflow.
        unchecked {
            for (uint256 i = 0; i < ownersLength; i++) {
                balances[i] = balanceOf[owners[i]][ids[i]];
            }
        }
    }

    /*///////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    function supportsInterface(bytes4 interfaceId) public pure virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0xd9b67a26 || // ERC165 Interface ID for ERC1155
            interfaceId == 0x0e89341c; // ERC165 Interface ID for ERC1155MetadataURI
    }

    /*///////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal {
        balanceOf[to][id] += amount;

        emit TransferSingle(msg.sender, address(0), to, id, amount);

        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155Received(msg.sender, address(0), id, amount, data) ==
                    ERC1155TokenReceiver.onERC1155Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    function _batchMint(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal {
        uint256 idsLength = ids.length; // Saves MLOADs.

        require(idsLength == amounts.length, "LENGTH_MISMATCH");

        for (uint256 i = 0; i < idsLength; ) {
            balanceOf[to][ids[i]] += amounts[i];

            // An array can't have a total length
            // larger than the max uint256 value.
            unchecked {
                i++;
            }
        }

        emit TransferBatch(msg.sender, address(0), to, ids, amounts);

        require(
            to.code.length == 0
                ? to != address(0)
                : ERC1155TokenReceiver(to).onERC1155BatchReceived(msg.sender, address(0), ids, amounts, data) ==
                    ERC1155TokenReceiver.onERC1155BatchReceived.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    function _batchBurn(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal {
        uint256 idsLength = ids.length; // Saves MLOADs.

        require(idsLength == amounts.length, "LENGTH_MISMATCH");

        for (uint256 i = 0; i < idsLength; ) {
            balanceOf[from][ids[i]] -= amounts[i];

            // An array can't have a total length
            // larger than the max uint256 value.
            unchecked {
                i++;
            }
        }

        emit TransferBatch(msg.sender, from, address(0), ids, amounts);
    }

    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal {
        balanceOf[from][id] -= amount;

        emit TransferSingle(msg.sender, from, address(0), id, amount);
    }
}

/// @notice A generic interface for a contract which properly accepts ERC1155 tokens.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC1155.sol)
interface ERC1155TokenReceiver {
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external returns (bytes4);

    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external returns (bytes4);
}
// File: @yield-protocol/utils-v2/contracts/utils/RevertMsgExtractor.sol



// SPDX-License-Identifier: MIT
// Taken from https://github.com/sushiswap/BoringSolidity/blob/441e51c0544cf2451e6116fe00515e71d7c42e2c/contracts/BoringBatchable.sol

pragma solidity >=0.6.0;


library RevertMsgExtractor {
    /// @dev Helper function to extract a useful revert message from a failed call.
    /// If the returned data is malformed or not correctly abi encoded then this call can fail itself.
    function getRevertMsg(bytes memory returnData)
        internal pure
        returns (string memory)
    {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (returnData.length < 68) return "Transaction reverted silently";

        assembly {
            // Slice the sighash.
            returnData := add(returnData, 0x04)
        }
        return abi.decode(returnData, (string)); // All that remains is the revert string
    }
}