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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "./base/PendleAuraBalancerStableLPSYV2.sol";
import "../../../../interfaces/IWETH.sol";
import "./base/MetaStable/MetaStablePreview.sol";

contract PendleAuraWethAnkrethSYV2 is PendleAuraBalancerStableLPSYV2 {
    address internal constant ANKRETH = 0xE95A203B1a91a908F9B9CE46459d101078c2c3cb;
    address internal constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    uint256 internal constant AURA_PID = 48;
    address internal constant LP = 0x8A34b5ad76F528bfEc06c80D85EF3b53dA7FC300;

    constructor(
        string memory _name,
        string memory _symbol,
        MetaStablePreview _previewHelper
    ) PendleAuraBalancerStableLPSYV2(_name, _symbol, LP, AURA_PID, _previewHelper) {}

    function _deposit(address tokenIn, uint256 amount)
        internal
        virtual
        override
        returns (uint256 amountSharesOut)
    {
        if (tokenIn == NATIVE) {
            IWETH(WETH).deposit{ value: amount }();
            amountSharesOut = super._deposit(WETH, amount);
        } else {
            amountSharesOut = super._deposit(tokenIn, amount);
        }
    }

    function _redeem(
        address receiver,
        address tokenOut,
        uint256 amountSharesToRedeem
    ) internal virtual override returns (uint256) {
        if (tokenOut == NATIVE) {
            uint256 amountTokenOut = super._redeem(address(this), WETH, amountSharesToRedeem);
            IWETH(WETH).withdraw(amountTokenOut);
            _transferOut(NATIVE, receiver, amountTokenOut);
            return amountTokenOut;
        } else {
            return super._redeem(receiver, tokenOut, amountSharesToRedeem);
        }
    }

    function _previewDeposit(address tokenIn, uint256 amountTokenToDeposit)
        internal
        view
        virtual
        override
        returns (uint256 amountSharesOut)
    {
        if (tokenIn == NATIVE) {
            amountSharesOut = super._previewDeposit(WETH, amountTokenToDeposit);
        } else {
            amountSharesOut = super._previewDeposit(tokenIn, amountTokenToDeposit);
        }
    }

    function _previewRedeem(address tokenOut, uint256 amountSharesToRedeem)
        internal
        view
        virtual
        override
        returns (uint256 amountTokenOut)
    {
        if (tokenOut == NATIVE) {
            amountTokenOut = super._previewRedeem(WETH, amountSharesToRedeem);
        } else {
            amountTokenOut = super._previewRedeem(tokenOut, amountSharesToRedeem);
        }
    }

    function _getPoolTokenAddresses()
        internal
        view
        virtual
        override
        returns (address[] memory res)
    {
        res = new address[](2);
        res[0] = WETH;
        res[1] = ANKRETH;
    }

    function _getRateProviders() internal view virtual returns (address[] memory res) {
        res = new address[](2);
        res[0] = 0x0000000000000000000000000000000000000000;
        res[1] = 0x00F8e64a8651E3479A0B20F46b1D462Fe29D6aBc;
    }

    function _getRawScalingFactors() internal view virtual returns (uint256[] memory res) {
        res = new uint256[](2);
        res[0] = 1e18;
        res[1] = 1e18;
    }

    function _getImmutablePoolData() internal view virtual override returns (bytes memory) {
        MetaStablePreview.ImmutableData memory res;
        res.LP = LP;
        res.poolTokens = _getPoolTokenAddresses();
        res.rateProviders = _getRateProviders();
        res.rawScalingFactors = _getRawScalingFactors();

        return abi.encode(res);
    }

    function getTokensIn() public view virtual override returns (address[] memory res) {
        res = new address[](4);
        res[0] = LP;
        res[1] = WETH;
        res[2] = ANKRETH;
        res[3] = NATIVE;
    }

    function getTokensOut() public view virtual override returns (address[] memory res) {
        res = new address[](4);
        res[0] = LP;
        res[1] = WETH;
        res[2] = ANKRETH;
        res[3] = NATIVE;
    }

    function isValidTokenIn(address token) public view virtual override returns (bool) {
        return (token == LP || token == WETH || token == ANKRETH || token == NATIVE);
    }

    function isValidTokenOut(address token) public view virtual override returns (bool) {
        return (token == LP || token == WETH || token == ANKRETH || token == NATIVE);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.0;

import "../../interfaces/draft-IERC1822.sol";
import "../ERC1967/ERC1967Upgrade.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is IERC1822Proxiable, ERC1967Upgrade {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate that the this implementation remains valid after an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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 Contracts guidelines: functions revert
 * instead 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, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 this function is
     * overridden;
     *
     * 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 override returns (uint8) {
        return 18;
    }

    /**
     * @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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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:
     *
     * - `account` 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 += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @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 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/extensions/draft-ERC20Permit.sol)

pragma solidity ^0.8.0;

import "./draft-IERC20Permit.sol";
import "../ERC20.sol";
import "../../../utils/cryptography/draft-EIP712.sol";
import "../../../utils/cryptography/ECDSA.sol";
import "../../../utils/Counters.sol";

/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private constant _PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    /**
     * @dev In previous versions `_PERMIT_TYPEHASH` was declared as `immutable`.
     * However, to ensure consistency with the upgradeable transpiler, we will continue
     * to reserve a slot.
     * @custom:oz-renamed-from _PERMIT_TYPEHASH
     */
    // solhint-disable-next-line var-name-mixedcase
    bytes32 private _PERMIT_TYPEHASH_DEPRECATED_SLOT;

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    constructor(string memory name) EIP712(name, "1") {}

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

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

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Context.sol";

/**
 * @dev Pendle's ERC20 implementation, modified from @openzeppelin implementation
 * Changes are:
 * - comes with built-in reentrancy protection, storage-packed with totalSupply variable
 * - delete increaseAllowance / decreaseAllowance
 * - add nonReentrancy protection to transfer / transferFrom functions
 * - allow decimals to be passed in
 * - block self-transfer by default
 */
// solhint-disable
contract PendleERC20 is Context, IERC20, IERC20Metadata {
    uint8 private constant _NOT_ENTERED = 1;
    uint8 private constant _ENTERED = 2;

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint248 private _totalSupply;
    uint8 private _status;

    string private _name;
    string private _symbol;
    uint8 public immutable decimals;

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Sets the values for {name}, {symbol} and {decimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        decimals = decimals_;
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(
        address to,
        uint256 amount
    ) external virtual override nonReentrant returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) external virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external virtual override nonReentrant returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(from != to, "ERC20: transfer to self");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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:
     *
     * - `account` 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 += toUint248(amount);
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= toUint248(amount);

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @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 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    function toUint248(uint256 x) internal virtual returns (uint248) {
        require(x <= type(uint248).max); // signed, lim = bit-1
        return uint248(x);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./PendleERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";
import "@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

/// @dev forked from OZ's ERC20Permit
contract PendleERC20Permit is PendleERC20, IERC20Permit, EIP712 {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private constant _PERMIT_TYPEHASH =
        keccak256(
            "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
        );

    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) PendleERC20(name_, symbol_, decimals_) EIP712(name_, "1") {}

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(
            abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline)
        );

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.0;

library ArrayLib {
    function sum(uint256[] memory input) internal pure returns (uint256) {
        uint256 value = 0;
        for (uint256 i = 0; i < input.length; ) {
            value += input[i];
            unchecked {
                i++;
            }
        }
        return value;
    }

    /// @notice return index of the element if found, else return uint256.max
    function find(address[] memory array, address element) internal pure returns (uint256 index) {
        uint256 length = array.length;
        for (uint256 i = 0; i < length; ) {
            if (array[i] == element) return i;
            unchecked {
                i++;
            }
        }
        return type(uint256).max;
    }

    function append(
        address[] memory inp,
        address element
    ) internal pure returns (address[] memory out) {
        uint256 length = inp.length;
        out = new address[](length + 1);
        for (uint256 i = 0; i < length; ) {
            out[i] = inp[i];
            unchecked {
                i++;
            }
        }
        out[length] = element;
    }

    // various version of contains
    function contains(address[] memory array, address element) internal pure returns (bool) {
        uint256 length = array.length;
        for (uint256 i = 0; i < length; ) {
            if (array[i] == element) return true;
            unchecked {
                i++;
            }
        }
        return false;
    }

    function contains(bytes4[] memory array, bytes4 element) internal pure returns (bool) {
        uint256 length = array.length;
        for (uint256 i = 0; i < length; ) {
            if (array[i] == element) return true;
            unchecked {
                i++;
            }
        }
        return false;
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

contract BoringOwnableUpgradeableData {
    address public owner;
    address public pendingOwner;
}

abstract contract BoringOwnableUpgradeable is BoringOwnableUpgradeableData, Initializable {
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    function __BoringOwnable_init() internal onlyInitializing {
        owner = msg.sender;
    }

    /// @notice Transfers ownership to `newOwner`. Either directly or claimable by the new pending owner.
    /// Can only be invoked by the current `owner`.
    /// @param newOwner Address of the new owner.
    /// @param direct True if `newOwner` should be set immediately. False if `newOwner` needs to use `claimOwnership`.
    /// @param renounce Allows the `newOwner` to be `address(0)` if `direct` and `renounce` is True. Has no effect otherwise.
    function transferOwnership(address newOwner, bool direct, bool renounce) public onlyOwner {
        if (direct) {
            // Checks
            require(newOwner != address(0) || renounce, "Ownable: zero address");

            // Effects
            emit OwnershipTransferred(owner, newOwner);
            owner = newOwner;
            pendingOwner = address(0);
        } else {
            // Effects
            pendingOwner = newOwner;
        }
    }

    /// @notice Needs to be called by `pendingOwner` to claim ownership.
    function claimOwnership() public {
        address _pendingOwner = pendingOwner;

        // Checks
        require(msg.sender == _pendingOwner, "Ownable: caller != pending owner");

        // Effects
        emit OwnershipTransferred(owner, _pendingOwner);
        owner = _pendingOwner;
        pendingOwner = address(0);
    }

    /// @notice Only allows the `owner` to execute the function.
    modifier onlyOwner() {
        require(msg.sender == owner, "Ownable: caller is not the owner");
        _;
    }

    uint256[48] private __gap;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

library Errors {
    // BulkSeller
    error BulkInsufficientSyForTrade(uint256 currentAmount, uint256 requiredAmount);
    error BulkInsufficientTokenForTrade(uint256 currentAmount, uint256 requiredAmount);
    error BulkInSufficientSyOut(uint256 actualSyOut, uint256 requiredSyOut);
    error BulkInSufficientTokenOut(uint256 actualTokenOut, uint256 requiredTokenOut);
    error BulkInsufficientSyReceived(uint256 actualBalance, uint256 requiredBalance);
    error BulkNotMaintainer();
    error BulkNotAdmin();
    error BulkSellerAlreadyExisted(address token, address SY, address bulk);
    error BulkSellerInvalidToken(address token, address SY);
    error BulkBadRateTokenToSy(uint256 actualRate, uint256 currentRate, uint256 eps);
    error BulkBadRateSyToToken(uint256 actualRate, uint256 currentRate, uint256 eps);

    // APPROX
    error ApproxFail();
    error ApproxParamsInvalid(uint256 guessMin, uint256 guessMax, uint256 eps);
    error ApproxBinarySearchInputInvalid(
        uint256 approxGuessMin,
        uint256 approxGuessMax,
        uint256 minGuessMin,
        uint256 maxGuessMax
    );

    // MARKET + MARKET MATH CORE
    error MarketExpired();
    error MarketZeroAmountsInput();
    error MarketZeroAmountsOutput();
    error MarketZeroLnImpliedRate();
    error MarketInsufficientPtForTrade(int256 currentAmount, int256 requiredAmount);
    error MarketInsufficientPtReceived(uint256 actualBalance, uint256 requiredBalance);
    error MarketInsufficientSyReceived(uint256 actualBalance, uint256 requiredBalance);
    error MarketZeroTotalPtOrTotalAsset(int256 totalPt, int256 totalAsset);
    error MarketExchangeRateBelowOne(int256 exchangeRate);
    error MarketProportionMustNotEqualOne();
    error MarketRateScalarBelowZero(int256 rateScalar);
    error MarketScalarRootBelowZero(int256 scalarRoot);
    error MarketProportionTooHigh(int256 proportion, int256 maxProportion);

    error OracleUninitialized();
    error OracleTargetTooOld(uint32 target, uint32 oldest);
    error OracleZeroCardinality();

    error MarketFactoryExpiredPt();
    error MarketFactoryInvalidPt();
    error MarketFactoryMarketExists();

    error MarketFactoryLnFeeRateRootTooHigh(uint80 lnFeeRateRoot, uint256 maxLnFeeRateRoot);
    error MarketFactoryReserveFeePercentTooHigh(
        uint8 reserveFeePercent,
        uint8 maxReserveFeePercent
    );
    error MarketFactoryZeroTreasury();
    error MarketFactoryInitialAnchorTooLow(int256 initialAnchor, int256 minInitialAnchor);

    // ROUTER
    error RouterInsufficientLpOut(uint256 actualLpOut, uint256 requiredLpOut);
    error RouterInsufficientSyOut(uint256 actualSyOut, uint256 requiredSyOut);
    error RouterInsufficientPtOut(uint256 actualPtOut, uint256 requiredPtOut);
    error RouterInsufficientYtOut(uint256 actualYtOut, uint256 requiredYtOut);
    error RouterInsufficientPYOut(uint256 actualPYOut, uint256 requiredPYOut);
    error RouterInsufficientTokenOut(uint256 actualTokenOut, uint256 requiredTokenOut);
    error RouterExceededLimitSyIn(uint256 actualSyIn, uint256 limitSyIn);
    error RouterExceededLimitPtIn(uint256 actualPtIn, uint256 limitPtIn);
    error RouterExceededLimitYtIn(uint256 actualYtIn, uint256 limitYtIn);
    error RouterInsufficientSyRepay(uint256 actualSyRepay, uint256 requiredSyRepay);
    error RouterInsufficientPtRepay(uint256 actualPtRepay, uint256 requiredPtRepay);
    error RouterNotAllSyUsed(uint256 netSyDesired, uint256 netSyUsed);

    error RouterTimeRangeZero();
    error RouterCallbackNotPendleMarket(address caller);
    error RouterInvalidAction(bytes4 selector);
    error RouterInvalidFacet(address facet);

    error RouterKyberSwapDataZero();

    // YIELD CONTRACT
    error YCExpired();
    error YCNotExpired();
    error YieldContractInsufficientSy(uint256 actualSy, uint256 requiredSy);
    error YCNothingToRedeem();
    error YCPostExpiryDataNotSet();
    error YCNoFloatingSy();

    // YieldFactory
    error YCFactoryInvalidExpiry();
    error YCFactoryYieldContractExisted();
    error YCFactoryZeroExpiryDivisor();
    error YCFactoryZeroTreasury();
    error YCFactoryInterestFeeRateTooHigh(uint256 interestFeeRate, uint256 maxInterestFeeRate);
    error YCFactoryRewardFeeRateTooHigh(uint256 newRewardFeeRate, uint256 maxRewardFeeRate);

    // SY
    error SYInvalidTokenIn(address token);
    error SYInvalidTokenOut(address token);
    error SYZeroDeposit();
    error SYZeroRedeem();
    error SYInsufficientSharesOut(uint256 actualSharesOut, uint256 requiredSharesOut);
    error SYInsufficientTokenOut(uint256 actualTokenOut, uint256 requiredTokenOut);

    // SY-specific
    error SYQiTokenMintFailed(uint256 errCode);
    error SYQiTokenRedeemFailed(uint256 errCode);
    error SYQiTokenRedeemRewardsFailed(uint256 rewardAccruedType0, uint256 rewardAccruedType1);
    error SYQiTokenBorrowRateTooHigh(uint256 borrowRate, uint256 borrowRateMax);

    error SYCurveInvalidPid();
    error SYCurve3crvPoolNotFound();

    error SYApeDepositAmountTooSmall(uint256 amountDeposited);
    error SYBalancerInvalidPid();
    error SYInvalidRewardToken(address token);

    error SYStargateRedeemCapExceeded(uint256 amountLpDesired, uint256 amountLpRedeemable);

    error SYBalancerReentrancy();

    // Liquidity Mining
    error VCInactivePool(address pool);
    error VCPoolAlreadyActive(address pool);
    error VCZeroVePendle(address user);
    error VCExceededMaxWeight(uint256 totalWeight, uint256 maxWeight);
    error VCEpochNotFinalized(uint256 wTime);
    error VCPoolAlreadyAddAndRemoved(address pool);

    error VEInvalidNewExpiry(uint256 newExpiry);
    error VEExceededMaxLockTime();
    error VEInsufficientLockTime();
    error VENotAllowedReduceExpiry();
    error VEZeroAmountLocked();
    error VEPositionNotExpired();
    error VEZeroPosition();
    error VEZeroSlope(uint128 bias, uint128 slope);
    error VEReceiveOldSupply(uint256 msgTime);

    error GCNotPendleMarket(address caller);
    error GCNotVotingController(address caller);

    error InvalidWTime(uint256 wTime);
    error ExpiryInThePast(uint256 expiry);
    error ChainNotSupported(uint256 chainId);

    error FDTotalAmountFundedNotMatch(uint256 actualTotalAmount, uint256 expectedTotalAmount);
    error FDEpochLengthMismatch();
    error FDInvalidPool(address pool);
    error FDPoolAlreadyExists(address pool);
    error FDInvalidNewFinishedEpoch(uint256 oldFinishedEpoch, uint256 newFinishedEpoch);
    error FDInvalidStartEpoch(uint256 startEpoch);
    error FDInvalidWTimeFund(uint256 lastFunded, uint256 wTime);
    error FDFutureFunding(uint256 lastFunded, uint256 currentWTime);

    error BDInvalidEpoch(uint256 epoch, uint256 startTime);

    // Cross-Chain
    error MsgNotFromSendEndpoint(uint16 srcChainId, bytes path);
    error MsgNotFromReceiveEndpoint(address sender);
    error InsufficientFeeToSendMsg(uint256 currentFee, uint256 requiredFee);
    error ApproxDstExecutionGasNotSet();
    error InvalidRetryData();

    // GENERIC MSG
    error ArrayLengthMismatch();
    error ArrayEmpty();
    error ArrayOutOfBounds();
    error ZeroAddress();
    error FailedToSendEther();

    error OnlyLayerZeroEndpoint();
    error OnlyYT();
    error OnlyYCFactory();
    error OnlyWhitelisted();

    // Swap Aggregator
    error SAInsufficientTokenIn(address tokenIn, uint256 amountExpected, uint256 amountActual);
    error UnsupportedSelector(uint256 aggregatorType, bytes4 selector);
}

// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.8.17;

/* solhint-disable private-vars-leading-underscore, reason-string */

library Math {
    uint256 internal constant ONE = 1e18; // 18 decimal places
    int256 internal constant IONE = 1e18; // 18 decimal places

    function subMax0(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked {
            return (a >= b ? a - b : 0);
        }
    }

    function subNoNeg(int256 a, int256 b) internal pure returns (int256) {
        require(a >= b, "negative");
        return a - b; // no unchecked since if b is very negative, a - b might overflow
    }

    function mulDown(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 product = a * b;
        unchecked {
            return product / ONE;
        }
    }

    function mulDown(int256 a, int256 b) internal pure returns (int256) {
        int256 product = a * b;
        unchecked {
            return product / IONE;
        }
    }

    function divDown(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 aInflated = a * ONE;
        unchecked {
            return aInflated / b;
        }
    }

    function divDown(int256 a, int256 b) internal pure returns (int256) {
        int256 aInflated = a * IONE;
        unchecked {
            return aInflated / b;
        }
    }

    function rawDivUp(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a + b - 1) / b;
    }

    // @author Uniswap
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }

    function abs(int256 x) internal pure returns (uint256) {
        return uint256(x > 0 ? x : -x);
    }

    function neg(int256 x) internal pure returns (int256) {
        return x * (-1);
    }

    function neg(uint256 x) internal pure returns (int256) {
        return Int(x) * (-1);
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x > y ? x : y);
    }

    function max(int256 x, int256 y) internal pure returns (int256) {
        return (x > y ? x : y);
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x < y ? x : y);
    }

    function min(int256 x, int256 y) internal pure returns (int256) {
        return (x < y ? x : y);
    }

    /*///////////////////////////////////////////////////////////////
                               SIGNED CASTS
    //////////////////////////////////////////////////////////////*/

    function Int(uint256 x) internal pure returns (int256) {
        require(x <= uint256(type(int256).max));
        return int256(x);
    }

    function Int128(int256 x) internal pure returns (int128) {
        require(type(int128).min <= x && x <= type(int128).max);
        return int128(x);
    }

    function Int128(uint256 x) internal pure returns (int128) {
        return Int128(Int(x));
    }

    /*///////////////////////////////////////////////////////////////
                               UNSIGNED CASTS
    //////////////////////////////////////////////////////////////*/

    function Uint(int256 x) internal pure returns (uint256) {
        require(x >= 0);
        return uint256(x);
    }

    function Uint32(uint256 x) internal pure returns (uint32) {
        require(x <= type(uint32).max);
        return uint32(x);
    }

    function Uint112(uint256 x) internal pure returns (uint112) {
        require(x <= type(uint112).max);
        return uint112(x);
    }

    function Uint96(uint256 x) internal pure returns (uint96) {
        require(x <= type(uint96).max);
        return uint96(x);
    }

    function Uint128(uint256 x) internal pure returns (uint128) {
        require(x <= type(uint128).max);
        return uint128(x);
    }

    function isAApproxB(uint256 a, uint256 b, uint256 eps) internal pure returns (bool) {
        return mulDown(b, ONE - eps) <= a && a <= mulDown(b, ONE + eps);
    }

    function isAGreaterApproxB(uint256 a, uint256 b, uint256 eps) internal pure returns (bool) {
        return a >= b && a <= mulDown(b, ONE + eps);
    }

    function isASmallerApproxB(uint256 a, uint256 b, uint256 eps) internal pure returns (bool) {
        return a <= b && a >= mulDown(b, ONE - eps);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../../interfaces/IWETH.sol";

abstract contract TokenHelper {
    using SafeERC20 for IERC20;
    address internal constant NATIVE = address(0);
    uint256 internal constant LOWER_BOUND_APPROVAL = type(uint96).max / 2; // some tokens use 96 bits for approval

    function _transferIn(address token, address from, uint256 amount) internal {
        if (token == NATIVE) require(msg.value == amount, "eth mismatch");
        else if (amount != 0) IERC20(token).safeTransferFrom(from, address(this), amount);
    }

    function _transferFrom(IERC20 token, address from, address to, uint256 amount) internal {
        if (amount != 0) token.safeTransferFrom(from, to, amount);
    }

    function _transferOut(address token, address to, uint256 amount) internal {
        if (amount == 0) return;
        if (token == NATIVE) {
            (bool success, ) = to.call{ value: amount }("");
            require(success, "eth send failed");
        } else {
            IERC20(token).safeTransfer(to, amount);
        }
    }

    function _transferOut(address[] memory tokens, address to, uint256[] memory amounts) internal {
        uint256 numTokens = tokens.length;
        require(numTokens == amounts.length, "length mismatch");
        for (uint256 i = 0; i < numTokens; ) {
            _transferOut(tokens[i], to, amounts[i]);
            unchecked {
                i++;
            }
        }
    }

    function _selfBalance(address token) internal view returns (uint256) {
        return (token == NATIVE) ? address(this).balance : IERC20(token).balanceOf(address(this));
    }

    function _selfBalance(IERC20 token) internal view returns (uint256) {
        return token.balanceOf(address(this));
    }

    /// @notice Approves the stipulated contract to spend the given allowance in the given token
    /// @dev PLS PAY ATTENTION to tokens that requires the approval to be set to 0 before changing it
    function _safeApprove(address token, address to, uint256 value) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20.approve.selector, to, value)
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Safe Approve");
    }

    function _safeApproveInf(address token, address to) internal {
        if (token == NATIVE) return;
        if (IERC20(token).allowance(address(this), to) < LOWER_BOUND_APPROVAL) {
            _safeApprove(token, to, 0);
            _safeApprove(token, to, type(uint256).max);
        }
    }

    function _wrap_unwrap_ETH(address tokenIn, address tokenOut, uint256 netTokenIn) internal {
        if (tokenIn == NATIVE) IWETH(tokenOut).deposit{ value: netTokenIn }();
        else IWETH(tokenIn).withdraw(netTokenIn);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "./RewardManagerAbstract.sol";

/// NOTE: This RewardManager is used with SY & YTv2 & PendleMarket. For YTv1, it will use RewardManagerAbstract
/// NOTE: RewardManager must not have duplicated rewardTokens
abstract contract RewardManager is RewardManagerAbstract {
    using Math for uint256;
    using ArrayLib for uint256[];

    uint256 public lastRewardBlock;

    mapping(address => RewardState) public rewardState;

    uint256 internal constant INITIAL_REWARD_INDEX = 1;

    function _updateRewardIndex()
        internal
        virtual
        override
        returns (address[] memory tokens, uint256[] memory indexes)
    {
        tokens = _getRewardTokens();
        indexes = new uint256[](tokens.length);

        if (tokens.length == 0) return (tokens, indexes);

        if (lastRewardBlock != block.number) {
            // if we have not yet update the index for this block
            lastRewardBlock = block.number;

            uint256 totalShares = _rewardSharesTotal();

            _redeemExternalReward();

            for (uint256 i = 0; i < tokens.length; ++i) {
                address token = tokens[i];

                // the entire token balance of the contract must be the rewards of the contract
                uint256 accrued = _selfBalance(tokens[i]) - rewardState[token].lastBalance;
                uint256 index = rewardState[token].index;

                if (index == 0) index = INITIAL_REWARD_INDEX;
                if (totalShares != 0) index += accrued.divDown(totalShares);

                rewardState[token].index = index.Uint128();
                rewardState[token].lastBalance += accrued.Uint128();
            }
        }

        for (uint256 i = 0; i < tokens.length; i++) indexes[i] = rewardState[tokens[i]].index;
    }

    /// @dev this function doesn't need redeemExternal since redeemExternal is bundled in updateRewardIndex
    /// @dev this function also has to update rewardState.lastBalance
    function _doTransferOutRewards(
        address user,
        address receiver
    ) internal virtual override returns (uint256[] memory rewardAmounts) {
        address[] memory tokens = _getRewardTokens();
        rewardAmounts = new uint256[](tokens.length);
        for (uint256 i = 0; i < tokens.length; i++) {
            rewardAmounts[i] = userReward[tokens[i]][user].accrued;
            if (rewardAmounts[i] != 0) {
                userReward[tokens[i]][user].accrued = 0;
                rewardState[tokens[i]].lastBalance -= rewardAmounts[i].Uint128();
                _transferOut(tokens[i], receiver, rewardAmounts[i]);
            }
        }
    }

    function _getRewardTokens() internal view virtual returns (address[] memory);

    function _rewardSharesTotal() internal view virtual returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "../../interfaces/IRewardManager.sol";

import "../libraries/ArrayLib.sol";
import "../libraries/TokenHelper.sol";
import "../libraries/math/Math.sol";

import "./RewardManagerAbstract.sol";

/// NOTE: RewardManager must not have duplicated rewardTokens
abstract contract RewardManagerAbstract is IRewardManager, TokenHelper {
    using Math for uint256;

    struct RewardState {
        uint128 index;
        uint128 lastBalance;
    }

    struct UserReward {
        uint128 index;
        uint128 accrued;
    }

    // [token] => [user] => (index,accrued)
    mapping(address => mapping(address => UserReward)) public userReward;

    function _updateAndDistributeRewards(address user) internal virtual {
        _updateAndDistributeRewardsForTwo(user, address(0));
    }

    function _updateAndDistributeRewardsForTwo(address user1, address user2) internal virtual {
        (address[] memory tokens, uint256[] memory indexes) = _updateRewardIndex();
        if (tokens.length == 0) return;

        if (user1 != address(0) && user1 != address(this))
            _distributeRewardsPrivate(user1, tokens, indexes);
        if (user2 != address(0) && user2 != address(this))
            _distributeRewardsPrivate(user2, tokens, indexes);
    }

    // should only be callable from `_updateAndDistributeRewardsForTwo` to guarantee user != address(0) && user != address(this)
    function _distributeRewardsPrivate(
        address user,
        address[] memory tokens,
        uint256[] memory indexes
    ) private {
        assert(user != address(0) && user != address(this));

        uint256 userShares = _rewardSharesUser(user);

        for (uint256 i = 0; i < tokens.length; ++i) {
            address token = tokens[i];
            uint256 index = indexes[i];
            uint256 userIndex = userReward[token][user].index;

            if (userIndex == 0) {
                userReward[token][user].index = index.Uint128();
                continue;
            }

            if (userIndex == index) continue;

            uint256 deltaIndex = index - userIndex;
            uint256 rewardDelta = userShares.mulDown(deltaIndex);
            uint256 rewardAccrued = userReward[token][user].accrued + rewardDelta;

            userReward[token][user] = UserReward({
                index: index.Uint128(),
                accrued: rewardAccrued.Uint128()
            });
        }
    }

    function _updateRewardIndex()
        internal
        virtual
        returns (address[] memory tokens, uint256[] memory indexes);

    function _redeemExternalReward() internal virtual;

    function _doTransferOutRewards(
        address user,
        address receiver
    ) internal virtual returns (uint256[] memory rewardAmounts);

    function _rewardSharesUser(address user) internal view virtual returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.17;

/* solhint-disable private-vars-leading-underscore */

/**
 * @dev forked from https://etherscan.io/token/0x8e85e97ed19c0fa13b2549309965291fbbc0048b#code
 * with omitted overflow checks given solidity version
 */

library FixedPoint {
    uint256 internal constant ONE = 1e18; // 18 decimal places
    uint256 internal constant TWO = 2 * ONE;
    uint256 internal constant FOUR = 4 * ONE;

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mulDown(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a * b) / ONE;
    }

    function mulUp(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 product = a * b;
        if (product == 0) {
            return 0;
        } else {
            unchecked {
                return ((product - 1) / ONE) + 1;
            }
        }
    }

    function divDown(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "Zero division");

        if (a == 0) {
            return 0;
        } else {
            uint256 aInflated = a * ONE;
            return aInflated / b;
        }
    }

    function divUp(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "Zero division");

        if (a == 0) {
            return 0;
        } else {
            uint256 aInflated = a * ONE;
            unchecked {
                return ((aInflated - 1) / b) + 1;
            }
        }
    }

    function complement(uint256 x) internal pure returns (uint256) {
        unchecked {
            return (x < ONE) ? (ONE - x) : 0;
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.17;

import "../FixedPoint.sol";

// almost copy-paste from https://etherscan.io/token/0x1e19cf2d73a72ef1332c882f20534b6519be0276#code
library MetaStableMath {
    using FixedPoint for uint256;

    uint256 internal constant _MIN_AMP = 1;
    uint256 internal constant _MAX_AMP = 5000;
    uint256 internal constant _AMP_PRECISION = 1e3;

    function _calculateInvariant(
        uint256 amplificationParameter,
        uint256[] memory balances,
        bool roundUp
    ) public pure returns (uint256) {
        unchecked {
            /**********************************************************************************************
        // invariant                                                                                 //
        // D = invariant                                                  D^(n+1)                    //
        // A = amplification coefficient      A  n^n S + D = A D n^n + -----------                   //
        // S = sum of balances                                             n^n P                     //
        // P = product of balances                                                                   //
        // n = number of tokens                                                                      //
        **********************************************************************************************/
            // We support rounding up or down.

            uint256 sum = 0;
            uint256 numTokens = balances.length;
            for (uint256 i = 0; i < numTokens; i++) {
                sum = sum.add(balances[i]);
            }
            if (sum == 0) {
                return 0;
            }

            uint256 prevInvariant = 0;
            uint256 invariant = sum;
            uint256 ampTimesTotal = amplificationParameter * numTokens;

            for (uint256 i = 0; i < 255; i++) {
                uint256 P_D = balances[0] * numTokens;
                for (uint256 j = 1; j < numTokens; j++) {
                    P_D = div(mul(mul(P_D, balances[j]), numTokens), invariant, roundUp);
                }
                prevInvariant = invariant;
                invariant = div(
                    mul(mul(numTokens, invariant), invariant).add(
                        div(mul(mul(ampTimesTotal, sum), P_D), _AMP_PRECISION, roundUp)
                    ),
                    mul(numTokens + 1, invariant).add(
                        // No need to use checked arithmetic for the amp precision, the amp is guaranteed to be at least 1
                        div(mul(ampTimesTotal - _AMP_PRECISION, P_D), _AMP_PRECISION, !roundUp)
                    ),
                    roundUp
                );

                if (invariant > prevInvariant) {
                    if (invariant - prevInvariant <= 1) {
                        return invariant;
                    }
                } else if (prevInvariant - invariant <= 1) {
                    return invariant;
                }
            }

            revert("Stable Invariant did not converge");
        }
    }

    function _calcBptOutGivenExactTokensIn(
        uint256 amp,
        uint256[] memory balances,
        uint256[] memory amountsIn,
        uint256 bptTotalSupply,
        uint256 swapFeePercentage
    ) internal pure returns (uint256) {
        unchecked {
            // BPT out, so we round down overall.

            // First loop calculates the sum of all token balances, which will be used to calculate
            // the current weights of each token, relative to this sum
            uint256 sumBalances = 0;
            for (uint256 i = 0; i < balances.length; i++) {
                sumBalances = sumBalances.add(balances[i]);
            }

            // Calculate the weighted balance ratio without considering fees
            uint256[] memory balanceRatiosWithFee = new uint256[](amountsIn.length);
            // The weighted sum of token balance ratios with fee
            uint256 invariantRatioWithFees = 0;
            for (uint256 i = 0; i < balances.length; i++) {
                uint256 currentWeight = balances[i].divDown(sumBalances);
                balanceRatiosWithFee[i] = balances[i].add(amountsIn[i]).divDown(balances[i]);
                invariantRatioWithFees = invariantRatioWithFees.add(
                    balanceRatiosWithFee[i].mulDown(currentWeight)
                );
            }

            // Second loop calculates new amounts in, taking into account the fee on the percentage excess
            uint256[] memory newBalances = new uint256[](balances.length);
            for (uint256 i = 0; i < balances.length; i++) {
                uint256 amountInWithoutFee;

                // Check if the balance ratio is greater than the ideal ratio to charge fees or not
                if (balanceRatiosWithFee[i] > invariantRatioWithFees) {
                    uint256 nonTaxableAmount = balances[i].mulDown(
                        invariantRatioWithFees.sub(FixedPoint.ONE)
                    );
                    uint256 taxableAmount = amountsIn[i].sub(nonTaxableAmount);
                    // No need to use checked arithmetic for the swap fee, it is guaranteed to be lower than 50%
                    amountInWithoutFee = nonTaxableAmount.add(
                        taxableAmount.mulDown(FixedPoint.ONE - swapFeePercentage)
                    );
                } else {
                    amountInWithoutFee = amountsIn[i];
                }

                newBalances[i] = balances[i].add(amountInWithoutFee);
            }

            // Get current and new invariants, taking swap fees into account
            uint256 currentInvariant = _calculateInvariant(amp, balances, true);
            uint256 newInvariant = _calculateInvariant(amp, newBalances, false);
            uint256 invariantRatio = newInvariant.divDown(currentInvariant);

            // If the invariant didn't increase for any reason, we simply don't mint BPT
            if (invariantRatio > FixedPoint.ONE) {
                return bptTotalSupply.mulDown(invariantRatio - FixedPoint.ONE);
            } else {
                return 0;
            }
        }
    }

    function _calcTokenOutGivenExactBptIn(
        uint256 amp,
        uint256[] memory balances,
        uint256 tokenIndex,
        uint256 bptAmountIn,
        uint256 bptTotalSupply,
        uint256 swapFeePercentage
    ) internal pure returns (uint256) {
        unchecked {
            // Token out, so we round down overall.

            // Get the current and new invariants. Since we need a bigger new invariant, we round the current one up.
            uint256 currentInvariant = _calculateInvariant(amp, balances, true);
            uint256 newInvariant = bptTotalSupply.sub(bptAmountIn).divUp(bptTotalSupply).mulUp(
                currentInvariant
            );

            // Calculate amount out without fee
            uint256 newBalanceTokenIndex = _getTokenBalanceGivenInvariantAndAllOtherBalances(
                amp,
                balances,
                newInvariant,
                tokenIndex
            );
            uint256 amountOutWithoutFee = balances[tokenIndex].sub(newBalanceTokenIndex);

            // First calculate the sum of all token balances, which will be used to calculate
            // the current weight of each token
            uint256 sumBalances = 0;
            for (uint256 i = 0; i < balances.length; i++) {
                sumBalances = sumBalances.add(balances[i]);
            }

            // We can now compute how much excess balance is being withdrawn as a result of the virtual swaps, which result
            // in swap fees.
            uint256 currentWeight = balances[tokenIndex].divDown(sumBalances);
            uint256 taxablePercentage = currentWeight.complement();

            // Swap fees are typically charged on 'token in', but there is no 'token in' here, so we apply it
            // to 'token out'. This results in slightly larger price impact. Fees are rounded up.
            uint256 taxableAmount = amountOutWithoutFee.mulUp(taxablePercentage);
            uint256 nonTaxableAmount = amountOutWithoutFee.sub(taxableAmount);

            // No need to use checked arithmetic for the swap fee, it is guaranteed to be lower than 50%
            return nonTaxableAmount.add(taxableAmount.mulDown(FixedPoint.ONE - swapFeePercentage));
        }
    }

    // The amplification parameter equals: A n^(n-1)
    function _calcDueTokenProtocolSwapFeeAmount(
        uint256 amplificationParameter,
        uint256[] memory balances,
        uint256 lastInvariant,
        uint256 tokenIndex,
        uint256 protocolSwapFeePercentage
    ) internal pure returns (uint256) {
        unchecked {
            /**************************************************************************************************************
        // oneTokenSwapFee - polynomial equation to solve                                                            //
        // af = fee amount to calculate in one token                                                                 //
        // bf = balance of fee token                                                                                 //
        // f = bf - af (finalBalanceFeeToken)                                                                        //
        // D = old invariant                                            D                     D^(n+1)                //
        // A = amplification coefficient               f^2 + ( S - ----------  - D) * f -  ------------- = 0         //
        // n = number of tokens                                    (A * n^n)               A * n^2n * P              //
        // S = sum of final balances but f                                                                           //
        // P = product of final balances but f                                                                       //
        **************************************************************************************************************/

            // Protocol swap fee amount, so we round down overall.

            uint256 finalBalanceFeeToken = _getTokenBalanceGivenInvariantAndAllOtherBalances(
                amplificationParameter,
                balances,
                lastInvariant,
                tokenIndex
            );

            if (balances[tokenIndex] <= finalBalanceFeeToken) {
                // This shouldn't happen outside of rounding errors, but have this safeguard nonetheless to prevent the Pool
                // from entering a locked state in which joins and exits revert while computing accumulated swap fees.
                return 0;
            }

            // Result is rounded down
            uint256 accumulatedTokenSwapFees = balances[tokenIndex] - finalBalanceFeeToken;
            return accumulatedTokenSwapFees.mulDown(protocolSwapFeePercentage);
        }
    }

    // This function calculates the balance of a given token (tokenIndex)
    // given all the other balances and the invariant
    function _getTokenBalanceGivenInvariantAndAllOtherBalances(
        uint256 amplificationParameter,
        uint256[] memory balances,
        uint256 invariant,
        uint256 tokenIndex
    ) internal pure returns (uint256) {
        unchecked {
            // Rounds result up overall

            uint256 ampTimesTotal = amplificationParameter * balances.length;
            uint256 sum = balances[0];
            uint256 P_D = balances[0] * balances.length;
            for (uint256 j = 1; j < balances.length; j++) {
                P_D = divDown(mul(mul(P_D, balances[j]), balances.length), invariant);
                sum = sum.add(balances[j]);
            }
            // No need to use safe math, based on the loop above `sum` is greater than or equal to `balances[tokenIndex]`
            sum = sum - balances[tokenIndex];

            uint256 inv2 = mul(invariant, invariant);
            // We remove the balance from c by multiplying it
            uint256 c = mul(
                mul(divUp(inv2, mul(ampTimesTotal, P_D)), _AMP_PRECISION),
                balances[tokenIndex]
            );
            uint256 b = sum.add(mul(divDown(invariant, ampTimesTotal), _AMP_PRECISION));

            // We iterate to find the balance
            uint256 prevTokenBalance = 0;
            // We multiply the first iteration outside the loop with the invariant to set the value of the
            // initial approximation.
            uint256 tokenBalance = divUp(inv2.add(c), invariant.add(b));

            for (uint256 i = 0; i < 255; i++) {
                prevTokenBalance = tokenBalance;

                tokenBalance = divUp(
                    mul(tokenBalance, tokenBalance).add(c),
                    mul(tokenBalance, 2).add(b).sub(invariant)
                );

                if (tokenBalance > prevTokenBalance) {
                    if (tokenBalance - prevTokenBalance <= 1) {
                        return tokenBalance;
                    }
                } else if (prevTokenBalance - tokenBalance <= 1) {
                    return tokenBalance;
                }
            }

            revert("Stable get balance did not converge");
        }
    }

    /*///////////////////////////////////////////////////////////////
                    LEGACY MATH FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked {
            uint256 c = a * b;
            require(a == 0 || c / a == b);
            return c;
        }
    }

    function div(uint256 a, uint256 b, bool roundUp) internal pure returns (uint256) {
        return roundUp ? divUp(a, b) : divDown(a, b);
    }

    function divDown(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked {
            require(b != 0);
            return a / b;
        }
    }

    function divUp(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked {
            require(b != 0);

            if (a == 0) {
                return 0;
            } else {
                return 1 + (a - 1) / b;
            }
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol";

import "../../../../../../interfaces/Balancer/IMetaStablePool.sol";
import "../../../../../../interfaces/Balancer/IRateProvider.sol";

import "../FixedPoint.sol";
import "./MetaStableMath.sol";
import "../StablePoolUserData.sol";

import "../StablePreviewBase.sol";
import "../../../../../libraries/BoringOwnableUpgradeable.sol";

// this contract will be upgradable for the first 3-6 months, then its upgradeability will be relinquished
contract MetaStablePreview is StablePreviewBase, BoringOwnableUpgradeable, UUPSUpgradeable {
    using FixedPoint for uint256;
    using MetaStableMath for uint256;
    using StablePoolUserData for bytes;

    struct ImmutableData {
        address LP;
        address[] poolTokens;
        address[] rateProviders;
        uint256[] rawScalingFactors;
    }

    constructor() initializer {}

    function initialize() external initializer {
        __BoringOwnable_init();
    }

    function _authorizeUpgrade(address newImplementation) internal override onlyOwner {}

    function onJoinPool(
        bytes32 poolId,
        address sender,
        address recipient,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        uint256 protocolSwapFeePercentage,
        bytes memory userData,
        bytes memory poolImmutableData
    ) internal view override returns (uint256 bptAmountOut) {
        ImmutableData memory imd = abi.decode(poolImmutableData, (ImmutableData));

        uint256[] memory caches = _cachePriceRatesIfNecessary(imd);

        uint256[] memory scalingFactors = _scalingFactors(imd, caches);

        // skip totalSupply == 0 case

        _upscaleArray(balances, scalingFactors);
        (bptAmountOut, , ) = _onJoinPool(
            poolId,
            sender,
            recipient,
            balances,
            lastChangeBlock,
            protocolSwapFeePercentage,
            scalingFactors,
            userData,
            imd
        );

        // skip _mintPoolTokens, _downscale
    }

    function onExitPool(
        bytes32 poolId,
        address sender,
        address recipient,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        uint256 protocolSwapFeePercentage,
        bytes memory userData,
        bytes memory poolImmutableData
    ) internal view virtual override returns (uint256 amountTokenOut) {
        ImmutableData memory imd = abi.decode(poolImmutableData, (ImmutableData));

        uint256[] memory caches = _cachePriceRatesIfNecessary(imd);

        uint256[] memory scalingFactors = _scalingFactors(imd, caches);
        _upscaleArray(balances, scalingFactors);

        (, uint256[] memory amountsOut, ) = _onExitPool(
            poolId,
            sender,
            recipient,
            balances,
            lastChangeBlock,
            protocolSwapFeePercentage,
            scalingFactors,
            userData,
            imd
        );

        // skip burnPoolTokens

        _downscaleDownArray(amountsOut, scalingFactors);
        // skip _downscaleDownArray of dueProtocolFeeAmounts

        for (uint256 i = 0; i < amountsOut.length; i++) {
            if (amountsOut[i] > 0) {
                amountTokenOut = amountsOut[i];
            }
        }
    }

    function _onJoinPool(
        bytes32,
        address,
        address,
        uint256[] memory balances,
        uint256,
        uint256 protocolSwapFeePercentage,
        uint256[] memory scalingFactors,
        bytes memory userData,
        ImmutableData memory imd
    ) internal view returns (uint256, uint256[] memory, uint256[] memory) {
        // skip _updateOracle

        uint256[] memory dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(
            balances,
            protocolSwapFeePercentage,
            imd
        );

        _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);
        (uint256 bptAmountOut, uint256[] memory amountsIn) = _doJoin(
            balances,
            scalingFactors,
            userData,
            imd
        );

        // skip _updateInvariantAfterJoin

        return (bptAmountOut, amountsIn, dueProtocolFeeAmounts);
    }

    function _onExitPool(
        bytes32,
        address,
        address,
        uint256[] memory balances,
        uint256,
        uint256 protocolSwapFeePercentage,
        uint256[] memory scalingFactors,
        bytes memory userData,
        ImmutableData memory imd
    )
        internal
        view
        virtual
        returns (
            uint256 bptAmountIn,
            uint256[] memory amountsOut,
            uint256[] memory dueProtocolFeeAmounts
        )
    {
        // skip _updateOracle

        dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(
            balances,
            protocolSwapFeePercentage,
            imd
        );

        _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);

        (bptAmountIn, amountsOut) = _doExit(balances, scalingFactors, userData, imd);

        // skip pause case

        // skip _updateInvariantAfterExit

        return (bptAmountIn, amountsOut, dueProtocolFeeAmounts);
    }

    function _getDueProtocolFeeAmounts(
        uint256[] memory balances,
        uint256 protocolSwapFeePercentage,
        ImmutableData memory imd
    ) private view returns (uint256[] memory) {
        uint256[] memory dueProtocolFeeAmounts = new uint256[](2);

        if (protocolSwapFeePercentage == 0) {
            return dueProtocolFeeAmounts;
        }

        uint256 chosenTokenIndex = 0;
        uint256 maxBalance = balances[0];
        for (uint256 i = 1; i < 2; ++i) {
            uint256 currentBalance = balances[i];
            if (currentBalance > maxBalance) {
                chosenTokenIndex = i;
                maxBalance = currentBalance;
            }
        }

        (uint256 _lastInvariant, uint256 _lastInvariantAmp) = IMetaStablePool(imd.LP)
            .getLastInvariant();
        dueProtocolFeeAmounts[chosenTokenIndex] = MetaStableMath
            ._calcDueTokenProtocolSwapFeeAmount(
                _lastInvariantAmp,
                balances,
                _lastInvariant,
                chosenTokenIndex,
                protocolSwapFeePercentage
            );

        return dueProtocolFeeAmounts;
    }

    function _doJoin(
        uint256[] memory balances,
        uint256[] memory scalingFactors,
        bytes memory userData,
        ImmutableData memory imd
    ) private view returns (uint256, uint256[] memory) {
        return _joinExactTokensInForBPTOut(balances, scalingFactors, userData, imd);
    }

    function _joinExactTokensInForBPTOut(
        uint256[] memory balances,
        uint256[] memory scalingFactors,
        bytes memory userData,
        ImmutableData memory imd
    ) private view returns (uint256, uint256[] memory) {
        (uint256[] memory amountsIn, ) = userData.exactTokensInForBptOut();

        _upscaleArray(amountsIn, scalingFactors);

        (uint256 currentAmp, , ) = IMetaStablePool(imd.LP).getAmplificationParameter();
        uint256 bptAmountOut = MetaStableMath._calcBptOutGivenExactTokensIn(
            currentAmp,
            balances,
            amountsIn,
            IMetaStablePool(imd.LP).totalSupply(),
            IMetaStablePool(imd.LP).getSwapFeePercentage()
        );

        return (bptAmountOut, amountsIn);
    }

    function _doExit(
        uint256[] memory balances,
        uint256[] memory,
        bytes memory userData,
        ImmutableData memory imd
    ) private view returns (uint256, uint256[] memory) {
        return _exitExactBPTInForTokenOut(balances, userData, imd);
    }

    function _exitExactBPTInForTokenOut(
        uint256[] memory balances,
        bytes memory userData,
        ImmutableData memory imd
    ) private view returns (uint256, uint256[] memory) {
        // This exit function is disabled if the contract is paused.

        (uint256 bptAmountIn, uint256 tokenIndex) = userData.exactBptInForTokenOut();
        // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.

        // We exit in a single token, so initialize amountsOut with zeros
        uint256[] memory amountsOut = new uint256[](2);

        // And then assign the result to the selected token
        (uint256 currentAmp, , ) = IMetaStablePool(imd.LP).getAmplificationParameter();
        amountsOut[tokenIndex] = MetaStableMath._calcTokenOutGivenExactBptIn(
            currentAmp,
            balances,
            tokenIndex,
            bptAmountIn,
            IMetaStablePool(imd.LP).totalSupply(),
            IMetaStablePool(imd.LP).getSwapFeePercentage()
        );

        return (bptAmountIn, amountsOut);
    }

    function _scalingFactors(
        ImmutableData memory imd,
        uint256[] memory caches
    ) internal view virtual returns (uint256[] memory) {
        uint256[] memory scalingFactors = new uint256[](2);

        for (uint256 i = 0; i < 2; ++i) {
            scalingFactors[i] = imd.rawScalingFactors[i].mulDown(_priceRate(caches, i));
        }

        return scalingFactors;
    }

    function _priceRate(
        uint256[] memory caches,
        uint256 index
    ) internal view virtual returns (uint256) {
        return caches[index] == 0 ? FixedPoint.ONE : caches[index];
    }

    function _cachePriceRatesIfNecessary(
        ImmutableData memory imd
    ) internal view returns (uint256[] memory res) {
        res = new uint256[](2);
        res[0] = _cachePriceRateIfNecessary(0, imd);
        res[1] = _cachePriceRateIfNecessary(1, imd);
    }

    function _cachePriceRateIfNecessary(
        uint256 index,
        ImmutableData memory imd
    ) internal view returns (uint256 res) {
        if (!_hasRateProvider(imd, index)) return res;

        uint256 expires;
        (res, , expires) = IMetaStablePool(imd.LP).getPriceRateCache(
            IERC20(imd.poolTokens[index])
        );

        if (block.timestamp > expires) {
            res = IRateProvider(imd.rateProviders[index]).getRate();
        }
    }

    /*///////////////////////////////////////////////////////////////
                               Helpers functions
    //////////////////////////////////////////////////////////////*/

    function _upscaleArray(
        uint256[] memory amounts,
        uint256[] memory scalingFactors
    ) internal pure {
        require(amounts.length == scalingFactors.length, "Array length mismatch");

        uint256 length = amounts.length;
        for (uint256 i = 0; i < length; ++i) {
            amounts[i] = FixedPoint.mulDown(amounts[i], scalingFactors[i]);
        }
    }

    function _downscaleDownArray(
        uint256[] memory amounts,
        uint256[] memory scalingFactors
    ) internal pure {
        require(amounts.length == scalingFactors.length, "Array length mismatch");

        uint256 length = amounts.length;
        for (uint256 i = 0; i < length; ++i) {
            amounts[i] = FixedPoint.divDown(amounts[i], scalingFactors[i]);
        }
    }

    function _mutateAmounts(
        uint256[] memory toMutate,
        uint256[] memory arguments,
        function(uint256, uint256) pure returns (uint256) mutation
    ) private pure {
        for (uint256 i = 0; i < 2; ++i) {
            toMutate[i] = mutation(toMutate[i], arguments[i]);
        }
    }

    function _hasRateProvider(
        ImmutableData memory imd,
        uint256 index
    ) internal pure returns (bool) {
        return address(imd.rateProviders[index]) != address(0);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "../../../../../interfaces/Balancer/IVault.sol";
import "../../../../../interfaces/Balancer/IRateProvider.sol";
import "../../../../../interfaces/Balancer/IBasePool.sol";
import "../../../../../interfaces/Balancer/IBalancerStablePreview.sol";
import "../../../../../interfaces/ConvexCurve/IBooster.sol";
import "../../../../../interfaces/ConvexCurve/IRewards.sol";

import "./StablePoolUserData.sol";
import "../../../../libraries/ArrayLib.sol";
import "../../../SYBaseWithRewards.sol";

abstract contract PendleAuraBalancerStableLPSYV2 is SYBaseWithRewards {
    using ArrayLib for address[];

    address internal constant BAL_TOKEN = 0xba100000625a3754423978a60c9317c58a424e3D;
    address internal constant AURA_TOKEN = 0xC0c293ce456fF0ED870ADd98a0828Dd4d2903DBF;
    address internal constant AURA_BOOSTER = 0xA57b8d98dAE62B26Ec3bcC4a365338157060B234;
    address internal constant BALANCER_VAULT = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;
    uint256 internal constant DEFAULT_GAS_REENTRANCY_CHECK = 7000;

    address public immutable balLp;
    bytes32 public immutable balPoolId;

    uint256 public immutable auraPid;
    address public immutable auraRewardManager;

    IBalancerStablePreview public immutable previewHelper;

    uint256 public gasForReentrancyCheck;
    address[] public extraRewards;

    constructor(
        string memory _name,
        string memory _symbol,
        address _balLp,
        uint256 _auraPid,
        IBalancerStablePreview _previewHelper
    ) SYBaseWithRewards(_name, _symbol, _balLp) {
        balPoolId = IBasePool(_balLp).getPoolId();
        auraPid = _auraPid;

        (balLp, auraRewardManager) = _getPoolInfo(_auraPid);
        if (balLp != _balLp) revert Errors.SYBalancerInvalidPid();

        _safeApproveInf(_balLp, AURA_BOOSTER);

        address[] memory tokens = _getPoolTokenAddresses();
        for (uint256 i = 0; i < tokens.length; ++i) {
            _safeApproveInf(tokens[i], BALANCER_VAULT);
        }

        previewHelper = _previewHelper;
        gasForReentrancyCheck = DEFAULT_GAS_REENTRANCY_CHECK;
    }

    function _getPoolInfo(uint256 _auraPid)
        internal
        view
        returns (address _auraLp, address _auraRewardManager)
    {
        if (_auraPid > IBooster(AURA_BOOSTER).poolLength()) revert Errors.SYBalancerInvalidPid();
        (_auraLp, , , _auraRewardManager, , ) = IBooster(AURA_BOOSTER).poolInfo(_auraPid);
    }

    /*///////////////////////////////////////////////////////////////
                    DEPOSIT/REDEEM USING BASE TOKENS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Either wraps LP, or also joins pool using exact tokenIn
     */
    function _deposit(address tokenIn, uint256 amount)
        internal
        virtual
        override
        returns (uint256 amountSharesOut)
    {
        if (tokenIn == balLp) {
            amountSharesOut = amount;
        } else {
            amountSharesOut = _depositToBalancer(tokenIn, amount);
        }
        IBooster(AURA_BOOSTER).deposit(auraPid, amountSharesOut, true);
    }

    /**
     * @notice Either unwraps LP, or also exits pool using exact LP for only `tokenOut`
     */
    function _redeem(
        address receiver,
        address tokenOut,
        uint256 amountSharesToRedeem
    ) internal virtual override returns (uint256 amountTokenOut) {
        IRewards(auraRewardManager).withdrawAndUnwrap(amountSharesToRedeem, false);

        if (tokenOut == balLp) {
            amountTokenOut = amountSharesToRedeem;
            _transferOut(tokenOut, receiver, amountTokenOut);
        } else {
            amountTokenOut = _redeemFromBalancer(receiver, tokenOut, amountSharesToRedeem);
        }
    }

    function exchangeRate() external view override returns (uint256) {
        _checkBalancerReadOnlyReentrancy();
        return IRateProvider(balLp).getRate();
    }

    /*
    * The `manageUserBalance` function is a non-view function that includes a reentrancy guard
        in the form of `_require(_status != _ENTERED, Errors.REENTRANCY);`. To prevent
        read-only reentrancy, it's important to ensure that our `manageUserBalance` has enough gas
        to reach this check, so that it can fail if necessary.

    * On the way to the check, there's at most one `COLD_SLOAD` plus miscellaneous decoding &
        require, which we've found through testing to cost no more than 3200 gas. Therefore,
        attaching 7000 gas should guarantee that it's always possible to reach the check.

    * Once we've reached the check, one of two scenarios can occur:
    1. The call doesn't pass the check, and reverts with error `BAL#400` ⇒ `response.length = 100`.
    2. The call passes the check. Then, the call can either:
        a. continue on to set the `status` variable to 2, causing the EVM to revert (since
        the sub-call is a `staticcall`), and `response.length == 0`
        b. run out of gas, which will also lead to a revert with `response.length == 0`
    In both cases, to differentiate between 1 and 2, we check `response.length != 0`. If it's
    true, then it's a read-only reentrancy. Otherwise, we're good (and we can ignore
    differentiating between 2a and 2b).
    */
    function _checkBalancerReadOnlyReentrancy() internal view {
        IVault.UserBalanceOp[] memory noop = new IVault.UserBalanceOp[](0);

        (bool isSuccess, bytes memory response) = BALANCER_VAULT.staticcall{
            gas: gasForReentrancyCheck
        }(
            abi.encodeWithSignature(
                "manageUserBalance((uint8,address,uint256,address,address)[])",
                noop
            )
        );

        assert(!isSuccess);
        if (response.length != 0) revert Errors.SYBalancerReentrancy();
    }

    function setGasForReentrancyCheck(uint256 newGas) external onlyOwner {
        require(newGas >= DEFAULT_GAS_REENTRANCY_CHECK, "lower than default");
        gasForReentrancyCheck = newGas;
    }

    /*///////////////////////////////////////////////////////////////
                    BALANCER-RELATED FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function _depositToBalancer(address tokenIn, uint256 amountTokenToDeposit)
        internal
        virtual
        returns (uint256)
    {
        IVault.JoinPoolRequest memory request = _assembleJoinRequest(
            tokenIn,
            amountTokenToDeposit
        );
        IVault(BALANCER_VAULT).joinPool(balPoolId, address(this), address(this), request);

        // amount shares out = amount LP received
        return _selfBalance(balLp);
    }

    function _assembleJoinRequest(address tokenIn, uint256 amountTokenToDeposit)
        internal
        view
        virtual
        returns (IVault.JoinPoolRequest memory request)
    {
        // max amounts in
        address[] memory assets = _getPoolTokenAddresses();

        uint256 amountsLength = _getBPTIndex() < type(uint256).max
            ? assets.length - 1
            : assets.length;

        uint256[] memory amountsIn = new uint256[](amountsLength);
        uint256[] memory maxAmountsIn = new uint256[](assets.length);

        uint256 index = assets.find(tokenIn);
        uint256 indexSkipBPT = index > _getBPTIndex() ? index - 1 : index;
        maxAmountsIn[index] = amountsIn[indexSkipBPT] = amountTokenToDeposit;

        // encode user data
        StablePoolUserData.JoinKind joinKind = StablePoolUserData
            .JoinKind
            .EXACT_TOKENS_IN_FOR_BPT_OUT;
        uint256 minimumBPT = 0;

        bytes memory userData = abi.encode(joinKind, amountsIn, minimumBPT);

        // assemble joinpoolrequest
        request = IVault.JoinPoolRequest(assets, maxAmountsIn, userData, false);
    }

    function _redeemFromBalancer(
        address receiver,
        address tokenOut,
        uint256 amountLpToRedeem
    ) internal virtual returns (uint256) {
        uint256 balanceBefore = IERC20(tokenOut).balanceOf(receiver);

        IVault.ExitPoolRequest memory request = _assembleExitRequest(tokenOut, amountLpToRedeem);
        IVault(BALANCER_VAULT).exitPool(balPoolId, address(this), payable(receiver), request);

        // calculate amount of tokens out
        uint256 balanceAfter = IERC20(tokenOut).balanceOf(receiver);
        return balanceAfter - balanceBefore;
    }

    function _assembleExitRequest(address tokenOut, uint256 amountLpToRedeem)
        internal
        view
        virtual
        returns (IVault.ExitPoolRequest memory request)
    {
        address[] memory assets = _getPoolTokenAddresses();
        uint256[] memory minAmountsOut = new uint256[](assets.length);

        // encode user data
        StablePoolUserData.ExitKind exitKind = StablePoolUserData
            .ExitKind
            .EXACT_BPT_IN_FOR_ONE_TOKEN_OUT;
        uint256 bptAmountIn = amountLpToRedeem;
        uint256 exitTokenIndex = assets.find(tokenOut);

        // must drop BPT index as well
        exitTokenIndex = _getBPTIndex() < exitTokenIndex ? exitTokenIndex - 1 : exitTokenIndex;

        bytes memory userData = abi.encode(exitKind, bptAmountIn, exitTokenIndex);

        // assemble exitpoolrequest
        request = IVault.ExitPoolRequest(assets, minAmountsOut, userData, false);
    }

    /// @dev this should return tokens in the same order as `IVault.getPoolTokens()`
    function _getPoolTokenAddresses() internal view virtual returns (address[] memory res);

    /// @dev should be overriden if and only if BPT is one of the pool tokens
    function _getBPTIndex() internal view virtual returns (uint256) {
        return type(uint256).max;
    }

    /*///////////////////////////////////////////////////////////////
                   PREVIEW FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function _previewDeposit(address tokenIn, uint256 amountTokenToDeposit)
        internal
        view
        virtual
        override
        returns (uint256 amountSharesOut)
    {
        if (tokenIn == balLp) {
            amountSharesOut = amountTokenToDeposit;
        } else {
            IVault.JoinPoolRequest memory request = _assembleJoinRequest(
                tokenIn,
                amountTokenToDeposit
            );
            amountSharesOut = previewHelper.joinPoolPreview(
                balPoolId,
                address(this),
                address(this),
                request,
                _getImmutablePoolData()
            );
        }
    }

    function _previewRedeem(address tokenOut, uint256 amountSharesToRedeem)
        internal
        view
        virtual
        override
        returns (uint256 amountTokenOut)
    {
        if (tokenOut == balLp) {
            amountTokenOut = amountSharesToRedeem;
        } else {
            IVault.ExitPoolRequest memory request = _assembleExitRequest(
                tokenOut,
                amountSharesToRedeem
            );

            amountTokenOut = previewHelper.exitPoolPreview(
                balPoolId,
                address(this),
                address(this),
                request,
                _getImmutablePoolData()
            );
        }
    }

    function _getImmutablePoolData() internal view virtual returns (bytes memory);

    /*///////////////////////////////////////////////////////////////
                               REWARDS-RELATED
    //////////////////////////////////////////////////////////////*/

    /// @notice allows owner to add new reward tokens in in case Aura does so with their pools
    function addRewardTokens(address token) external virtual onlyOwner {
        if (token == BAL_TOKEN || token == AURA_TOKEN || extraRewards.contains(token))
            revert Errors.SYInvalidRewardToken(token);

        uint256 nRewardsAura = IRewards(auraRewardManager).extraRewardsLength();
        for (uint256 i = 0; i < nRewardsAura; i++) {
            if (token == IRewards(IRewards(auraRewardManager).extraRewards(i)).rewardToken()) {
                extraRewards.push(token);
                return;
            }
        }

        revert Errors.SYInvalidRewardToken(token);
    }

    function extraRewardsLength() external view virtual returns (uint256) {
        return extraRewards.length;
    }

    function _getRewardTokens() internal view virtual override returns (address[] memory res) {
        uint256 extraRewardsLen = extraRewards.length;
        res = new address[](2 + extraRewardsLen);
        res[0] = BAL_TOKEN;
        res[1] = AURA_TOKEN;
        for (uint256 i = 0; i < extraRewardsLen; i++) {
            res[2 + i] = extraRewards[i];
        }
    }

    /// @dev if there is no extra rewards, we can call getReward with the 2nd arg (_claimExtra) to be false
    /// which helps save even more gas
    function _redeemExternalReward() internal virtual override {
        uint256 extraRewardsLen = extraRewards.length;
        if (extraRewardsLen == 0) IRewards(auraRewardManager).getReward(address(this), false);
        else IRewards(auraRewardManager).getReward(address(this), true);
    }

    /*///////////////////////////////////////////////////////////////
                    MISC FUNCTIONS FOR METADATA
    //////////////////////////////////////////////////////////////*/

    function getTokensIn() public view virtual override returns (address[] memory res);

    function getTokensOut() public view virtual override returns (address[] memory res);

    function isValidTokenIn(address token) public view virtual override returns (bool);

    function isValidTokenOut(address token) public view virtual override returns (bool);

    function assetInfo()
        external
        view
        returns (
            AssetType assetType,
            address assetAddress,
            uint8 assetDecimals
        )
    {
        return (AssetType.LIQUIDITY, balLp, IERC20Metadata(balLp).decimals());
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.17;

library StablePoolUserData {
    enum JoinKind {
        INIT,
        EXACT_TOKENS_IN_FOR_BPT_OUT,
        TOKEN_IN_FOR_EXACT_BPT_OUT
    }
    enum ExitKind {
        EXACT_BPT_IN_FOR_ONE_TOKEN_OUT,
        BPT_IN_FOR_EXACT_TOKENS_OUT
    }

    function exactTokensInForBptOut(
        bytes memory self
    ) internal pure returns (uint256[] memory amountsIn, uint256 minBPTAmountOut) {
        (, amountsIn, minBPTAmountOut) = abi.decode(self, (JoinKind, uint256[], uint256));
    }

    function exactBptInForTokenOut(
        bytes memory self
    ) internal pure returns (uint256 bptAmountIn, uint256 tokenIndex) {
        (, bptAmountIn, tokenIndex) = abi.decode(self, (ExitKind, uint256, uint256));
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../../../../../interfaces/Balancer/IVault.sol";
import "../../../../../interfaces/Balancer/IBalancerFees.sol";
import "../../../../../interfaces/Balancer/IBalancerStablePreview.sol";

abstract contract StablePreviewBase is IBalancerStablePreview {
    address internal constant BALANCER_VAULT = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;
    address internal constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address internal constant FEE_COLLECTOR = 0xce88686553686DA562CE7Cea497CE749DA109f9F;

    enum PoolBalanceChangeKind {
        JOIN,
        EXIT
    }

    struct PoolBalanceChange {
        IAsset[] assets;
        uint256[] limits;
        bytes userData;
        bool useInternalBalance;
    }

    function joinPoolPreview(
        bytes32 poolId,
        address sender,
        address recipient,
        IVault.JoinPoolRequest memory request,
        bytes memory data
    ) external view returns (uint256 amountBptOut) {
        amountBptOut = _joinOrExit(
            PoolBalanceChangeKind.JOIN,
            poolId,
            sender,
            payable(recipient),
            _toPoolBalanceChange(request),
            data
        );
    }

    function exitPoolPreview(
        bytes32 poolId,
        address sender,
        address recipient,
        IVault.ExitPoolRequest memory request,
        bytes memory data
    ) external view returns (uint256 amountTokenOut) {
        amountTokenOut = _joinOrExit(
            PoolBalanceChangeKind.EXIT,
            poolId,
            sender,
            recipient,
            _toPoolBalanceChange(request),
            data
        );
    }

    function _joinOrExit(
        PoolBalanceChangeKind kind,
        bytes32 poolId,
        address sender,
        address recipient,
        PoolBalanceChange memory change,
        bytes memory data
    ) private view returns (uint256 amountBptOrTokensOut) {
        IERC20[] memory tokens = _translateToIERC20(change.assets);
        (uint256[] memory balances, uint256 lastChangeBlock) = _validateTokensAndGetBalances(
            poolId,
            tokens
        );

        amountBptOrTokensOut = _callPoolBalanceChange(
            kind,
            poolId,
            sender,
            recipient,
            change,
            balances,
            lastChangeBlock,
            data
        );
    }

    function _callPoolBalanceChange(
        PoolBalanceChangeKind kind,
        bytes32 poolId,
        address sender,
        address recipient,
        PoolBalanceChange memory change,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        bytes memory data
    ) private view returns (uint256 amountsChanged) {
        if (kind == PoolBalanceChangeKind.JOIN) {
            amountsChanged = onJoinPool(
                poolId,
                sender,
                recipient,
                balances,
                lastChangeBlock,
                _getProtocolSwapFeePercentage(),
                change.userData,
                data
            );
        } else {
            amountsChanged = onExitPool(
                poolId,
                sender,
                recipient,
                balances,
                lastChangeBlock,
                _getProtocolSwapFeePercentage(),
                change.userData,
                data
            );
        }
    }

    function _getProtocolSwapFeePercentage() private view returns (uint256) {
        return IBalancerFees(FEE_COLLECTOR).getSwapFeePercentage();
    }

    function _validateTokensAndGetBalances(
        bytes32 poolId,
        IERC20[] memory //expectedTokens
    ) private view returns (uint256[] memory, uint256) {
        (, uint256[] memory balances, uint256 lastChangeBlock) = IVault(BALANCER_VAULT)
            .getPoolTokens(poolId);
        return (balances, lastChangeBlock);
    }

    function _translateToIERC20(IAsset[] memory assets) internal pure returns (IERC20[] memory) {
        IERC20[] memory tokens = new IERC20[](assets.length);
        for (uint256 i = 0; i < assets.length; ++i) {
            tokens[i] = _translateToIERC20(assets[i]);
        }
        return tokens;
    }

    function _translateToIERC20(IAsset asset) internal pure returns (IERC20) {
        return address(asset) == address(0) ? IERC20(WETH) : IERC20(address(asset));
    }

    function _toPoolBalanceChange(
        IVault.JoinPoolRequest memory request
    ) private pure returns (PoolBalanceChange memory change) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            change := request
        }
    }

    function _toPoolBalanceChange(
        IVault.ExitPoolRequest memory request
    ) private pure returns (PoolBalanceChange memory change) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            change := request
        }
    }

    function onJoinPool(
        bytes32 poolId,
        address sender,
        address recipient,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        uint256 protocolSwapFeePercentage,
        bytes memory userData,
        bytes memory data
    ) internal view virtual returns (uint256 bptAmountOut);

    function onExitPool(
        bytes32 poolId,
        address sender,
        address recipient,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        uint256 protocolSwapFeePercentage,
        bytes memory userData,
        bytes memory data
    ) internal view virtual returns (uint256 amountTokenOut);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;
import "../../interfaces/IStandardizedYield.sol";

import "../erc20/PendleERC20Permit.sol";

import "../libraries/math/Math.sol";
import "../libraries/TokenHelper.sol";
import "../libraries/Errors.sol";
import "../libraries/BoringOwnableUpgradeable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

abstract contract SYBase is
    IStandardizedYield,
    PendleERC20Permit,
    TokenHelper,
    BoringOwnableUpgradeable,
    Pausable
{
    using Math for uint256;

    address public immutable yieldToken;

    constructor(
        string memory _name,
        string memory _symbol,
        address _yieldToken
    ) PendleERC20Permit(_name, _symbol, IERC20Metadata(_yieldToken).decimals()) initializer {
        yieldToken = _yieldToken;
        __BoringOwnable_init();
    }

    // solhint-disable no-empty-blocks
    receive() external payable {}

    /*///////////////////////////////////////////////////////////////
                    DEPOSIT/REDEEM USING BASE TOKENS
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev See {IStandardizedYield-deposit}
     */
    function deposit(
        address receiver,
        address tokenIn,
        uint256 amountTokenToDeposit,
        uint256 minSharesOut
    ) external payable nonReentrant returns (uint256 amountSharesOut) {
        if (!isValidTokenIn(tokenIn)) revert Errors.SYInvalidTokenIn(tokenIn);
        if (amountTokenToDeposit == 0) revert Errors.SYZeroDeposit();

        _transferIn(tokenIn, msg.sender, amountTokenToDeposit);

        amountSharesOut = _deposit(tokenIn, amountTokenToDeposit);
        if (amountSharesOut < minSharesOut)
            revert Errors.SYInsufficientSharesOut(amountSharesOut, minSharesOut);

        _mint(receiver, amountSharesOut);
        emit Deposit(msg.sender, receiver, tokenIn, amountTokenToDeposit, amountSharesOut);
    }

    /**
     * @dev See {IStandardizedYield-redeem}
     */
    function redeem(
        address receiver,
        uint256 amountSharesToRedeem,
        address tokenOut,
        uint256 minTokenOut,
        bool burnFromInternalBalance
    ) external nonReentrant returns (uint256 amountTokenOut) {
        if (!isValidTokenOut(tokenOut)) revert Errors.SYInvalidTokenOut(tokenOut);
        if (amountSharesToRedeem == 0) revert Errors.SYZeroRedeem();

        if (burnFromInternalBalance) {
            _burn(address(this), amountSharesToRedeem);
        } else {
            _burn(msg.sender, amountSharesToRedeem);
        }

        amountTokenOut = _redeem(receiver, tokenOut, amountSharesToRedeem);
        if (amountTokenOut < minTokenOut)
            revert Errors.SYInsufficientTokenOut(amountTokenOut, minTokenOut);
        emit Redeem(msg.sender, receiver, tokenOut, amountSharesToRedeem, amountTokenOut);
    }

    /**
     * @notice mint shares based on the deposited base tokens
     * @param tokenIn base token address used to mint shares
     * @param amountDeposited amount of base tokens deposited
     * @return amountSharesOut amount of shares minted
     */
    function _deposit(
        address tokenIn,
        uint256 amountDeposited
    ) internal virtual returns (uint256 amountSharesOut);

    /**
     * @notice redeems base tokens based on amount of shares to be burned
     * @param tokenOut address of the base token to be redeemed
     * @param amountSharesToRedeem amount of shares to be burned
     * @return amountTokenOut amount of base tokens redeemed
     */
    function _redeem(
        address receiver,
        address tokenOut,
        uint256 amountSharesToRedeem
    ) internal virtual returns (uint256 amountTokenOut);

    /*///////////////////////////////////////////////////////////////
                               EXCHANGE-RATE
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev See {IStandardizedYield-exchangeRate}
     */
    function exchangeRate() external view virtual override returns (uint256 res);

    /*///////////////////////////////////////////////////////////////
                               REWARDS-RELATED
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev See {IStandardizedYield-claimRewards}
     */
    function claimRewards(
        address /*user*/
    ) external virtual override returns (uint256[] memory rewardAmounts) {
        rewardAmounts = new uint256[](0);
    }

    /**
     * @dev See {IStandardizedYield-getRewardTokens}
     */
    function getRewardTokens()
        external
        view
        virtual
        override
        returns (address[] memory rewardTokens)
    {
        rewardTokens = new address[](0);
    }

    /**
     * @dev See {IStandardizedYield-accruedRewards}
     */
    function accruedRewards(
        address /*user*/
    ) external view virtual override returns (uint256[] memory rewardAmounts) {
        rewardAmounts = new uint256[](0);
    }

    function rewardIndexesCurrent() external virtual override returns (uint256[] memory indexes) {
        indexes = new uint256[](0);
    }

    function rewardIndexesStored()
        external
        view
        virtual
        override
        returns (uint256[] memory indexes)
    {
        indexes = new uint256[](0);
    }

    /*///////////////////////////////////////////////////////////////
                MISC METADATA FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function previewDeposit(
        address tokenIn,
        uint256 amountTokenToDeposit
    ) external view virtual returns (uint256 amountSharesOut) {
        if (!isValidTokenIn(tokenIn)) revert Errors.SYInvalidTokenIn(tokenIn);
        return _previewDeposit(tokenIn, amountTokenToDeposit);
    }

    function previewRedeem(
        address tokenOut,
        uint256 amountSharesToRedeem
    ) external view virtual returns (uint256 amountTokenOut) {
        if (!isValidTokenOut(tokenOut)) revert Errors.SYInvalidTokenOut(tokenOut);
        return _previewRedeem(tokenOut, amountSharesToRedeem);
    }

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }

    function _beforeTokenTransfer(
        address,
        address,
        uint256
    ) internal virtual override whenNotPaused {}

    function _previewDeposit(
        address tokenIn,
        uint256 amountTokenToDeposit
    ) internal view virtual returns (uint256 amountSharesOut);

    function _previewRedeem(
        address tokenOut,
        uint256 amountSharesToRedeem
    ) internal view virtual returns (uint256 amountTokenOut);

    function getTokensIn() public view virtual returns (address[] memory res);

    function getTokensOut() public view virtual returns (address[] memory res);

    function isValidTokenIn(address token) public view virtual returns (bool);

    function isValidTokenOut(address token) public view virtual returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "../RewardManager/RewardManager.sol";
import "./SYBase.sol";

/// NOTE: yieldToken MUST NEVER BE a rewardToken, else the rewardManager will behave erroneously
abstract contract SYBaseWithRewards is SYBase, RewardManager {
    using Math for uint256;
    using ArrayLib for address[];

    constructor(
        string memory _name,
        string memory _symbol,
        address _yieldToken
    )
        SYBase(_name, _symbol, _yieldToken) // solhint-disable-next-line no-empty-blocks
    {}

    /*///////////////////////////////////////////////////////////////
                               REWARDS-RELATED
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev See {IStandardizedYield-claimRewards}
     */
    function claimRewards(address user)
        external
        virtual
        override
        nonReentrant
        returns (uint256[] memory rewardAmounts)
    {
        _updateAndDistributeRewards(user);
        rewardAmounts = _doTransferOutRewards(user, user);

        emit ClaimRewards(user, _getRewardTokens(), rewardAmounts);
    }

    /**
     * @dev See {IStandardizedYield-getRewardTokens}
     */
    function getRewardTokens()
        external
        view
        virtual
        override
        returns (address[] memory rewardTokens)
    {
        rewardTokens = _getRewardTokens();
    }

    /**
     * @dev See {IStandardizedYield-accruedRewards}
     */
    function accruedRewards(address user)
        external
        view
        virtual
        override
        returns (uint256[] memory rewardAmounts)
    {
        address[] memory rewardTokens = _getRewardTokens();
        rewardAmounts = new uint256[](rewardTokens.length);
        for (uint256 i = 0; i < rewardTokens.length; ) {
            rewardAmounts[i] = userReward[rewardTokens[i]][user].accrued;
            unchecked {
                i++;
            }
        }
    }

    function rewardIndexesCurrent()
        external
        override
        nonReentrant
        returns (uint256[] memory indexes)
    {
        _updateRewardIndex();
        return rewardIndexesStored();
    }

    function rewardIndexesStored()
        public
        view
        virtual
        override
        returns (uint256[] memory indexes)
    {
        address[] memory rewardTokens = _getRewardTokens();
        indexes = new uint256[](rewardTokens.length);
        for (uint256 i = 0; i < rewardTokens.length; ) {
            indexes[i] = rewardState[rewardTokens[i]].index;
            unchecked {
                i++;
            }
        }
    }

    /**
     * @notice returns the total number of reward shares
     * @dev this is simply the total supply of shares, as rewards shares are equivalent to SY shares
     */
    function _rewardSharesTotal() internal view virtual override returns (uint256) {
        return totalSupply();
    }

    /**
     * @notice returns the reward shares of (`user`)
     * @dev this is simply the SY balance of (`user`), as rewards shares are equivalent to SY shares
     */
    function _rewardSharesUser(address user) internal view virtual override returns (uint256) {
        return balanceOf(user);
    }

    /*///////////////////////////////////////////////////////////////
                            TRANSFER HOOKS
    //////////////////////////////////////////////////////////////*/
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256
    ) internal virtual override whenNotPaused {
        _updateAndDistributeRewardsForTwo(from, to);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IAsset {}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IBalancerFees {
    function getSwapFeePercentage() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "./IVault.sol";

interface IBalancerStablePreview {
    function joinPoolPreview(
        bytes32 poolId,
        address sender,
        address recipient,
        IVault.JoinPoolRequest memory request,
        bytes memory data
    ) external view returns (uint256 amountBptOut);

    function exitPoolPreview(
        bytes32 poolId,
        address sender,
        address recipient,
        IVault.ExitPoolRequest memory request,
        bytes memory data
    ) external view returns (uint256 amountTokenOut);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IBasePool is IERC20 {
    function onJoinPool(
        bytes32 poolId,
        address sender,
        address recipient,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        uint256 protocolSwapFeePercentage,
        bytes memory userData
    ) external returns (uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts);

    function onExitPool(
        bytes32 poolId,
        address sender,
        address recipient,
        uint256[] memory balances,
        uint256 lastChangeBlock,
        uint256 protocolSwapFeePercentage,
        bytes memory userData
    ) external returns (uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts);

    function getPoolId() external view returns (bytes32);

    function getSwapFeePercentage() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "./IBasePool.sol";

interface IMetaStablePool is IBasePool {
    function getLastInvariant()
        external
        view
        returns (uint256 lastInvariant, uint256 lastInvariantAmp);

    function getAmplificationParameter()
        external
        view
        returns (uint256 value, bool isUpdating, uint256 precision);

    function getSwapFeePercentage() external view returns (uint256);

    function getPriceRateCache(
        IERC20 token
    ) external view returns (uint256 rate, uint256 duration, uint256 expires);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IRateProvider {
    function getRate() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IAsset.sol";

interface IVault {
    enum UserBalanceOpKind {
        DEPOSIT_INTERNAL,
        WITHDRAW_INTERNAL,
        TRANSFER_INTERNAL,
        TRANSFER_EXTERNAL
    }

    struct UserBalanceOp {
        UserBalanceOpKind kind;
        IAsset asset;
        uint256 amount;
        address sender;
        address payable recipient;
    }

    struct JoinPoolRequest {
        address[] assets;
        uint256[] maxAmountsIn;
        bytes userData;
        bool fromInternalBalance;
    }

    function joinPool(
        bytes32 poolId,
        address sender,
        address recipient,
        JoinPoolRequest memory request
    ) external payable;

    struct ExitPoolRequest {
        address[] assets;
        uint256[] minAmountsOut;
        bytes userData;
        bool toInternalBalance;
    }

    function exitPool(
        bytes32 poolId,
        address sender,
        address payable recipient,
        ExitPoolRequest memory request
    ) external;

    enum SwapKind {
        GIVEN_IN,
        GIVEN_OUT
    }

    struct SingleSwap {
        bytes32 poolId;
        SwapKind kind;
        IAsset assetIn;
        IAsset assetOut;
        uint256 amount;
        bytes userData;
    }

    struct FundManagement {
        address sender;
        bool fromInternalBalance;
        address payable recipient;
        bool toInternalBalance;
    }

    function swap(
        SingleSwap memory singleSwap,
        FundManagement memory funds,
        uint256 limit,
        uint256 deadline
    ) external payable returns (uint256);

    function getPoolTokens(bytes32 poolId)
        external
        view
        returns (
            IERC20[] memory tokens,
            uint256[] memory balances,
            uint256 lastChangeBlock
        );

    function WETH() external view returns (IERC20);

    function getPool(bytes32 poolId) external view returns (address, uint8);

    function getProtocolFeesCollector() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IBooster {
    function crv() external view returns (address);

    function poolLength() external view returns (uint256);

    function poolInfo(
        uint256
    ) external view returns (address lpToken, address, address, address, address, bool);

    function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns (bool);

    function depositAll(uint256 _pid, bool _stake) external returns (bool);

    function withdraw(uint256 _pid, uint256 _amount) external returns (bool);

    function withdrawAll(uint256 _pid) external returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IRewards {
    function operator() external view returns (address);

    function stake(address, uint256) external;

    function stakeFor(address, uint256) external;

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

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

    function exit(address) external;

    function getReward(address /*_account*/, bool /*_claimExtras*/) external;

    function getReward() external;

    function queueNewRewards(uint256) external;

    function notifyRewardAmount(uint256) external;

    function addExtraReward(address) external;

    function rewardToken() external returns (address);

    function rewardPerToken() external returns (uint256);

    function rewardPerTokenStored() external view returns (uint256);

    function extraRewardsLength() external view returns (uint256);

    function extraRewards(uint256) external returns (address);

    function stakingToken() external returns (address);

    function lastTimeRewardApplicable() external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IRewardManager {
    function userReward(
        address token,
        address user
    ) external view returns (uint128 index, uint128 accrued);
}

// SPDX-License-Identifier: GPL-3.0-or-later
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */

pragma solidity 0.8.17;
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

interface IStandardizedYield is IERC20Metadata {
    /// @dev Emitted when any base tokens is deposited to mint shares
    event Deposit(
        address indexed caller,
        address indexed receiver,
        address indexed tokenIn,
        uint256 amountDeposited,
        uint256 amountSyOut
    );

    /// @dev Emitted when any shares are redeemed for base tokens
    event Redeem(
        address indexed caller,
        address indexed receiver,
        address indexed tokenOut,
        uint256 amountSyToRedeem,
        uint256 amountTokenOut
    );

    /// @dev check `assetInfo()` for more information
    enum AssetType {
        TOKEN,
        LIQUIDITY
    }

    /// @dev Emitted when (`user`) claims their rewards
    event ClaimRewards(address indexed user, address[] rewardTokens, uint256[] rewardAmounts);

    /**
     * @notice mints an amount of shares by depositing a base token.
     * @param receiver shares recipient address
     * @param tokenIn address of the base tokens to mint shares
     * @param amountTokenToDeposit amount of base tokens to be transferred from (`msg.sender`)
     * @param minSharesOut reverts if amount of shares minted is lower than this
     * @return amountSharesOut amount of shares minted
     * @dev Emits a {Deposit} event
     *
     * Requirements:
     * - (`tokenIn`) must be a valid base token.
     */
    function deposit(
        address receiver,
        address tokenIn,
        uint256 amountTokenToDeposit,
        uint256 minSharesOut
    ) external payable returns (uint256 amountSharesOut);

    /**
     * @notice redeems an amount of base tokens by burning some shares
     * @param receiver recipient address
     * @param amountSharesToRedeem amount of shares to be burned
     * @param tokenOut address of the base token to be redeemed
     * @param minTokenOut reverts if amount of base token redeemed is lower than this
     * @param burnFromInternalBalance if true, burns from balance of `address(this)`, otherwise burns from `msg.sender`
     * @return amountTokenOut amount of base tokens redeemed
     * @dev Emits a {Redeem} event
     *
     * Requirements:
     * - (`tokenOut`) must be a valid base token.
     */
    function redeem(
        address receiver,
        uint256 amountSharesToRedeem,
        address tokenOut,
        uint256 minTokenOut,
        bool burnFromInternalBalance
    ) external returns (uint256 amountTokenOut);

    /**
     * @notice exchangeRate * syBalance / 1e18 must return the asset balance of the account
     * @notice vice-versa, if a user uses some amount of tokens equivalent to X asset, the amount of sy
     he can mint must be X * exchangeRate / 1e18
     * @dev SYUtils's assetToSy & syToAsset should be used instead of raw multiplication
     & division
     */
    function exchangeRate() external view returns (uint256 res);

    /**
     * @notice claims reward for (`user`)
     * @param user the user receiving their rewards
     * @return rewardAmounts an array of reward amounts in the same order as `getRewardTokens`
     * @dev
     * Emits a `ClaimRewards` event
     * See {getRewardTokens} for list of reward tokens
     */
    function claimRewards(address user) external returns (uint256[] memory rewardAmounts);

    /**
     * @notice get the amount of unclaimed rewards for (`user`)
     * @param user the user to check for
     * @return rewardAmounts an array of reward amounts in the same order as `getRewardTokens`
     */
    function accruedRewards(address user) external view returns (uint256[] memory rewardAmounts);

    function rewardIndexesCurrent() external returns (uint256[] memory indexes);

    function rewardIndexesStored() external view returns (uint256[] memory indexes);

    /**
     * @notice returns the list of reward token addresses
     */
    function getRewardTokens() external view returns (address[] memory);

    /**
     * @notice returns the address of the underlying yield token
     */
    function yieldToken() external view returns (address);

    /**
     * @notice returns all tokens that can mint this SY
     */
    function getTokensIn() external view returns (address[] memory res);

    /**
     * @notice returns all tokens that can be redeemed by this SY
     */
    function getTokensOut() external view returns (address[] memory res);

    function isValidTokenIn(address token) external view returns (bool);

    function isValidTokenOut(address token) external view returns (bool);

    function previewDeposit(
        address tokenIn,
        uint256 amountTokenToDeposit
    ) external view returns (uint256 amountSharesOut);

    function previewRedeem(
        address tokenOut,
        uint256 amountSharesToRedeem
    ) external view returns (uint256 amountTokenOut);

    /**
     * @notice This function contains information to interpret what the asset is
     * @return assetType the type of the asset (0 for ERC20 tokens, 1 for AMM liquidity tokens)
     * @return assetAddress the address of the asset
     * @return assetDecimals the decimals of the asset
     */
    function assetInfo()
        external
        view
        returns (AssetType assetType, address assetAddress, uint8 assetDecimals);
}

// SPDX-License-Identifier: GPL-3.0-or-later
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IWETH is IERC20 {
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);

    function deposit() external payable;

    function withdraw(uint256 wad) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "viaIR": true,
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000021a9fd7212f37c35b030e9374510f99128d59cd3000000000000000000000000000000000000000000000000000000000000001f535920616e6b724554482d574554485f42616c616e6365724c50204175726100000000000000000000000000000000000000000000000000000000000000001f53592d616e6b724554482d574554485f42616c616e6365724c50204175726100

-----Decoded View---------------
Arg [0] : _name (string): SY ankrETH-WETH_BalancerLP Aura
Arg [1] : _symbol (string): SY-ankrETH-WETH_BalancerLP Aura
Arg [2] : _previewHelper (address): 0x21a9fd7212F37c35B030e9374510F99128d59CD3

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 00000000000000000000000021a9fd7212f37c35b030e9374510f99128d59cd3
Arg [3] : 000000000000000000000000000000000000000000000000000000000000001f
Arg [4] : 535920616e6b724554482d574554485f42616c616e6365724c50204175726100
Arg [5] : 000000000000000000000000000000000000000000000000000000000000001f
Arg [6] : 53592d616e6b724554482d574554485f42616c616e6365724c50204175726100