// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @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;
    }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol


// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: @openzeppelin/contracts/utils/Address.sol


// 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);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol


// 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);
}

// File: @openzeppelin/contracts/utils/Context.sol


// 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// 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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;




/**
 * @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");
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @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);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;




/**
 * @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 {}
}

// File: contracts/final/final_vault.sol



pragma solidity 0.8.12;






interface GLPRouter{
  function unstakeAndRedeemGlp(address _tokenOut, uint256 _glpAmount, uint256 _minOut, address _receiver) external returns (uint256) ;
  function mintAndStakeGlp(address _token, uint256 _amount, uint256 _minUsdg, uint256 _minGlp) external  returns (uint256);
  function claimFees() external;
  function claimEsGmx() external;
  function stakeEsGmx(uint256 _amount) external;
}

interface GDtoken is IERC20 {
    function mint(address recipient, uint256 _amount) external;
    function burn(address _from, uint256 _amount) external ;
}

interface GLPPriceFeed {

    function getGLPprice() external view returns (uint256);
    function getPrice(address _token) external  view returns (uint256) ;
}

interface IWETH is IERC20 {
    function deposit() external payable;
    function safeTransfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

contract vault is Ownable, ReentrancyGuard {

    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    
    uint256 public treasuryMintedGLP = 0;
    uint256 public slippage = 500;
    IWETH public WETH = IWETH(0x82aF49447D8a07e3bd95BD0d56f35241523fBab1);
    IERC20 public USDC = IERC20(0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8);
    IERC20 public WBTC = IERC20(0x2f2a2543B76A4166549F7aaB2e75Bef0aefC5B0f);
    IERC20 public EsGMX = IERC20(0xf42Ae1D54fd613C9bb14810b0588FaAa09a426cA);
    IERC20 public fsGLP = IERC20 (0x1aDDD80E6039594eE970E5872D247bf0414C8903);
    //IERC20 public WETH;
    //IERC20 public WBTC;
    
    GDtoken public gdUSDC;
    //IERC20 public gdWETH;
    //IERC20 public gdWBTC;
    GLPRouter public _GLPRouter = GLPRouter(0xA906F338CB21815cBc4Bc87ace9e68c87eF8d8F1); 
    address poolGLP = 0x321F653eED006AD1C29D174e17d96351BDe22649;
    GLPPriceFeed public priceFeed = GLPPriceFeed(0x06e31Ad70174D7dB1Eb06fCDa75Aa254E311BC3f);

    uint256 public compoundPercentage = 500;



    struct PoolInfo {
        IERC20 lpToken;    
        GDtoken GDlptoken; 
        uint256 EarnRateSec;     
        uint256 totalStaked; 
        uint256 lastUpdate; 
        uint256 vaultcap;
        uint256 glpFees;
        uint256 APR;
        bool stakable;
        bool withdrawable;
        bool rewardStart;
    }

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.

    constructor(GDtoken _gdUSDC, GDtoken _gdETH, GDtoken _gdBTC) { 

        poolInfo.push(PoolInfo({
            lpToken: USDC,
            GDlptoken: _gdUSDC,
            totalStaked:0,
            EarnRateSec:0,
            lastUpdate: block.timestamp,
            vaultcap: 0,
            stakable: false,
            withdrawable: false,
            rewardStart: false,
            glpFees: 500, 
            APR: 1500
            
        }));
        poolInfo.push(PoolInfo({
            lpToken: WETH,
            GDlptoken: _gdETH,
            totalStaked:0,
            EarnRateSec:0,
            lastUpdate: block.timestamp,
            vaultcap: 0,
            stakable: false,
            withdrawable: false,
            rewardStart: false,
            glpFees: 250, 
            APR: 700
            
        }));
        
        poolInfo.push(PoolInfo({
            lpToken: WBTC,
            GDlptoken: _gdBTC,
            totalStaked:0,
            EarnRateSec:0,
            lastUpdate: block.timestamp,
            vaultcap: 0,
            stakable: false,
            withdrawable: false,
            rewardStart: false,
            glpFees: 250, 
            APR: 700
            
        }));

    }

    function swapGLPto(uint256 _amount, address token, uint256 min_receive) private returns(uint256) {
        return _GLPRouter.unstakeAndRedeemGlp(token, _amount, min_receive, address(this));
    }

    function swapGLPout(uint256 _amount, address token, uint256 min_receive) external onlyOwner returns(uint256) {
        require(((fsGLP.balanceOf(address(this)) - _amount) >= GLPbackingNeeded()), "below backing");
        return _GLPRouter.unstakeAndRedeemGlp(token, _amount, min_receive, address(this));
    }

    function swaptoGLP(uint256 _amount, address token) private returns(uint256) {
        IERC20(token).safeApprove(poolGLP, _amount);
        return _GLPRouter.mintAndStakeGlp(token, _amount,0, 0);
    }

    function treasuryMint(uint _amount, address _token) public onlyOwner  {
        require(IERC20(_token).balanceOf(address(this)) >= _amount);
        treasuryMintedGLP = treasuryMintedGLP.add(swaptoGLP(_amount, _token));

        IERC20(_token).safeApprove(address(_GLPRouter), 0);

    }

    function cycleRewardsETHandEsGMX() external onlyOwner {

        _GLPRouter.claimEsGmx();
        _GLPRouter.stakeEsGmx(EsGMX.balanceOf(address(this)));
        _cycleRewardsETH();

    }

    function cycleRewardsETH() external onlyOwner {
            _cycleRewardsETH();

    }

    function _cycleRewardsETH() private {
        
        _GLPRouter.claimFees();
        uint256 rewards = WETH.balanceOf(address(this));
        uint256 compoundAmount = rewards.mul(compoundPercentage).div(1000);
        swaptoGLP(compoundAmount, address(WETH));
        WETH.transfer(owner(),  WETH.balanceOf(address(this)));

    }

    function setCompoundPercentage(uint256 _percent) external onlyOwner {
        require(_percent < 900 && _percent > 0, "not in range");
        compoundPercentage = _percent;
    }

    // Unlocks the staked + gained USDC and burns xUSDC
    function updatePool(uint256 _pid) internal {
        uint256 timepass = block.timestamp.sub(poolInfo[_pid].lastUpdate);
        poolInfo[_pid].lastUpdate = block.timestamp;
        uint256 reward = poolInfo[_pid].EarnRateSec.mul(timepass);
        poolInfo[_pid].totalStaked = poolInfo[_pid].totalStaked.add(reward);
        
    }

    function currentPoolTotal(uint256 _pid) public view returns (uint256) {
        uint reward =0;
        if (poolInfo[_pid].rewardStart) {
            uint256 timepass = block.timestamp.sub(poolInfo[_pid].lastUpdate);
            reward = poolInfo[_pid].EarnRateSec.mul(timepass);
        }
        return poolInfo[_pid].totalStaked.add(reward);
    }

    function updatePoolRate(uint256 _pid) internal {
        poolInfo[_pid].EarnRateSec =  poolInfo[_pid].totalStaked.mul(poolInfo[_pid].APR).div(10**4).div(365 days);
    }


    function setPoolCap(uint256 _pid, uint256 _vaultcap) external onlyOwner {
        poolInfo[_pid].vaultcap = _vaultcap;
    }

    function setAPR(uint256 _pid, uint256 _apr) external onlyOwner {
        require(_apr > 500 && _apr < 1600, " apr not in range");
        poolInfo[_pid].APR = _apr;
        if (poolInfo[_pid].rewardStart){
            updatePool(_pid);
        }
        updatePoolRate(_pid);
    }

    function openVault(uint256 _pid) external onlyOwner {

        poolInfo[_pid].stakable = true;
        poolInfo[_pid].withdrawable = false;
        
    }

    function openAllVault() external onlyOwner {
        for (uint256 _pid = 0; _pid < poolInfo.length; ++ _pid){
            poolInfo[_pid].stakable = true;
            poolInfo[_pid].withdrawable = false; 
        }
        
    }

    function startReward(uint256 _pid) external onlyOwner {
        require(!poolInfo[_pid].rewardStart, "already started");
        poolInfo[_pid].rewardStart = true;
        poolInfo[_pid].lastUpdate = block.timestamp;
        
    }

    function pauseReward(uint256 _pid) external onlyOwner {
        require(poolInfo[_pid].rewardStart, "not started");

        updatePool(_pid);
        poolInfo[_pid].rewardStart = false;
        poolInfo[_pid].lastUpdate = block.timestamp;
        
    }

    function openWithdraw(uint256 _pid) external onlyOwner {

        poolInfo[_pid].stakable = false;
        poolInfo[_pid].withdrawable = true;
    }

    function openAllWithdraw() external onlyOwner {

        for (uint256 _pid = 0; _pid < poolInfo.length; ++ _pid){
            poolInfo[_pid].stakable = false;
            poolInfo[_pid].withdrawable = true;
        }
    }

    function setSlippage(uint256 _slippage) external onlyOwner{

        require(_slippage >= 200 && _slippage <= 1000, "not in range");
        slippage = _slippage;
    }

    function checkDuplicate(GDtoken _GDlptoken) internal view returns(bool) {
        
        for (uint256 i = 0; i < poolInfo.length; ++i){
            if (poolInfo[i].GDlptoken == _GDlptoken){
                return false;
            }        
        }
        return true;
    }

    function addPool(IERC20 _lptoken, GDtoken _GDlptoken, uint256 _fees, uint256 _apr) external onlyOwner{
            
            require(_fees <= 700, "out of range. Fees too high");
            require(_apr > 500 && _apr < 1600, " apr not in range");
            require(checkDuplicate(_GDlptoken), "pool already created");

            poolInfo.push(PoolInfo({
            lpToken: _lptoken,
            GDlptoken: _GDlptoken,
            totalStaked:0,
            EarnRateSec:0,
            lastUpdate: block.timestamp,
            vaultcap: 0,
            stakable: false,
            withdrawable: false,
            rewardStart: false, 
            glpFees: _fees,
            APR: _apr
            
        }));
    }

    function enterETH(uint256 _pid) external payable nonReentrant {

        require(msg.value > 0, "RewardRouter: invalid msg.value");

        uint256 _amountin = msg.value;
        IERC20 StakedToken = poolInfo[_pid].lpToken;
        require(address(StakedToken) == address(WETH), "not eth pool");
        
 
        uint256 _amount = _amountin;

        GDtoken GDT = poolInfo[_pid].GDlptoken;

        require(poolInfo[_pid].stakable, "not stakable");
        require((poolInfo[_pid].totalStaked + _amount) <= poolInfo[_pid].vaultcap, "cant deposit more than vault cap");

        if (poolInfo[_pid].rewardStart){
            updatePool(_pid);
        }
        
        // Gets the amount of USDC locked in the contract
        uint256 totalStakedTokens = poolInfo[_pid].totalStaked;
        // Gets the amount of gdUSDC in existence
        uint256 totalShares = GDT.totalSupply();

        uint256 balanceMultipier = 100000 - poolInfo[_pid].glpFees;
        uint256 amountAfterFee = _amount.mul(balanceMultipier).div(100000);
        // If no gdUSDC exists, mint it 1:1 to the amount put in
        if (totalShares == 0 || totalStakedTokens == 0) {
            GDT.mint(msg.sender, amountAfterFee);
        } 
        // Calculate and mint the amount of gdUSDC the USDC is worth. The ratio will change overtime
        else {
            uint256 what = amountAfterFee.mul(totalShares).div(totalStakedTokens);
            GDT.mint(msg.sender, what);
        }
        
        poolInfo[_pid].totalStaked = poolInfo[_pid].totalStaked.add(amountAfterFee);

        updatePoolRate(_pid);
        WETH.deposit{value: _amountin}();   
        swaptoGLP(_amountin, address(StakedToken));
        StakedToken.safeApprove(address(_GLPRouter), 0);

    }

    function leaveETH(uint256 _share, uint256 _pid) external payable nonReentrant{

        GDtoken GDT = poolInfo[_pid].GDlptoken;
        IERC20 StakedToken = poolInfo[_pid].lpToken;

        require(_share <= GDT.balanceOf(msg.sender), "balance too low");
        require(poolInfo[_pid].withdrawable, "withdraw window not opened");

        if (poolInfo[_pid].rewardStart){
            updatePool(_pid);
        }


        // Gets the amount of xUSDC in existence
        uint256 totalShares = GDT.totalSupply();
        // Calculates the amount of USDC the xUSDC is worth
        uint256 amountOut = _share.mul(poolInfo[_pid].totalStaked).div(totalShares);

        poolInfo[_pid].totalStaked = poolInfo[_pid].totalStaked.sub(amountOut);
        updatePoolRate(_pid);
        GDT.burn(msg.sender, _share);

        uint256 amountSendOut = amountOut;

        uint256 percentage = 100000 - slippage;

        uint256 glpPrice = priceFeed.getGLPprice().mul(percentage).div(100000);
        uint256 tokenPrice = priceFeed.getPrice(address(StakedToken));

        uint256 glpOut = amountOut.mul(10**12).mul(tokenPrice).div(glpPrice).div(10**30); //amount *glp price after decimals handled
        swapGLPto(glpOut, address(StakedToken), amountSendOut);
        
        require(address(StakedToken) == address(WETH), "not eth pool");
        WETH.withdraw(amountSendOut);

        (bool success, ) = payable(msg.sender).call{value: amountSendOut}("");
        require(success, "Failed to send Ether");

    }
    receive() external payable {}
    

    function enter(uint256 _amountin, uint256 _pid) public nonReentrant {

        uint256 _amount = _amountin;
        
        //usdc decimals handling
        if (_pid == 0){
            _amount = _amountin.mul(10**12);
        }

        //btc decimals handling
        if (_pid == 2){
            _amount = _amountin.mul(10**10);
        }

        GDtoken GDT = poolInfo[_pid].GDlptoken;
        IERC20 StakedToken = poolInfo[_pid].lpToken;


        require(_amountin <= StakedToken.balanceOf(msg.sender), "balance too low" );
        require(poolInfo[_pid].stakable, "not stakable");
        require((poolInfo[_pid].totalStaked + _amount) <= poolInfo[_pid].vaultcap, "cant deposit more than vault cap");

        if (poolInfo[_pid].rewardStart){
            updatePool(_pid);
        }
        
        // Gets the amount of USDC locked in the contract
        uint256 totalStakedTokens = poolInfo[_pid].totalStaked;
        // Gets the amount of gdUSDC in existence
        uint256 totalShares = GDT.totalSupply();

        uint256 balanceMultipier = 100000 - poolInfo[_pid].glpFees;
        uint256 amountAfterFee = _amount.mul(balanceMultipier).div(100000);
        // If no gdUSDC exists, mint it 1:1 to the amount put in
        if (totalShares == 0 || totalStakedTokens == 0) {
            GDT.mint(msg.sender, amountAfterFee);
        } 
        // Calculate and mint the amount of gdUSDC the USDC is worth. The ratio will change overtime
        else {
            uint256 what = amountAfterFee.mul(totalShares).div(totalStakedTokens);
            GDT.mint(msg.sender, what);
        }
        
        poolInfo[_pid].totalStaked = poolInfo[_pid].totalStaked.add(amountAfterFee);

        updatePoolRate(_pid);
        
        StakedToken.safeTransferFrom(msg.sender, address(this), _amountin);
        
        swaptoGLP(_amountin, address(StakedToken));
        StakedToken.safeApprove(address(_GLPRouter), 0);
    }

    function leave(uint256 _share, uint256 _pid) public  nonReentrant returns(uint256){

        GDtoken GDT = poolInfo[_pid].GDlptoken;
        IERC20 StakedToken = poolInfo[_pid].lpToken;

        require(_share <= GDT.balanceOf(msg.sender), "balance too low");
        require(poolInfo[_pid].withdrawable, "withdraw window not opened");

        if (poolInfo[_pid].rewardStart){
            updatePool(_pid);
        }


        // Gets the amount of xUSDC in existence
        uint256 totalShares = GDT.totalSupply();
        // Calculates the amount of USDC the xUSDC is worth
        uint256 amountOut = _share.mul(poolInfo[_pid].totalStaked).div(totalShares);



        poolInfo[_pid].totalStaked = poolInfo[_pid].totalStaked.sub(amountOut);
        updatePoolRate(_pid);
        GDT.burn(msg.sender, _share);

        uint256 amountSendOut = amountOut;

        //usdc decimals handling
        if (_pid == 0){
            amountSendOut = amountOut.div(10**12); //handle usdc decimals 
        }
        
        //btc decimals handling
        if (_pid == 2){
             amountSendOut = amountOut.div(10**10);
        }

        uint256 percentage = 100000 - slippage;

        uint256 glpPrice = priceFeed.getGLPprice().mul(percentage).div(100000);
        uint256 tokenPrice = priceFeed.getPrice(address(StakedToken));

        uint256 glpOut = amountOut.mul(10**12).mul(tokenPrice).div(glpPrice).div(10**30); //amount *glp price after decimals handled
        swapGLPto(glpOut, address(StakedToken), amountSendOut);
        
        StakedToken.safeTransfer(msg.sender, amountSendOut);
        
        return amountSendOut;
    }

    function displayStakedBalance(address _address, uint256 _pid) public view returns(uint256) {

        GDtoken GDT = poolInfo[_pid].GDlptoken;
        uint256 totalShares = GDT.totalSupply();
        // Calculates the amount of USDC the xUSDC is worth
        uint256 amountOut = GDT.balanceOf(_address).mul(currentPoolTotal(_pid)).div(totalShares);
        return amountOut;
    }

    function GDpriceToStakedtoken(uint256 _pid) public view returns(uint256) {

        GDtoken GDT = poolInfo[_pid].GDlptoken;
        uint256 totalShares = GDT.totalSupply();
        // Calculates the amount of USDC the xUSDC is worth
        uint256 amountOut = (currentPoolTotal(_pid)).mul(10**18).div(totalShares);
        return amountOut;
    }


    function convertDust(address _token) external onlyOwner  {
        swaptoGLP(IERC20(_token).balanceOf(address(this)), _token);
    }

    //Recover treasury tokens from contract if needed 

    function recoverTreasuryTokensFromGLP(address _token, uint256 GLPamount) external onlyOwner {

        //only allow to recover treasury tokens and not drain the vault
        require(((fsGLP.balanceOf(address(this)) - GLPamount) >= GLPbackingNeeded()), "below backing");
   
        swapGLPto(GLPamount, _token, 0);
        IERC20(_token).safeTransfer(msg.sender,  IERC20(_token).balanceOf(address(this)));
        
    }

    
    function recoverTreasuryTokens(address _token, uint256 _amount) external onlyOwner {

        //cant drain glp
        require(_token != address(fsGLP), "no glp draining");
   
        IERC20(_token).safeTransfer(msg.sender, _amount);
        
    }

    function totalUSDvault(uint256 _pid) public view returns(uint256) {
         IERC20 StakedToken = poolInfo[_pid].lpToken;
         uint256 tokenPrice = priceFeed.getPrice(address(StakedToken));
         uint256 totalStakedTokens = currentPoolTotal(_pid);
         uint256 totalUSD = tokenPrice.mul(totalStakedTokens).div(10**30);

         return totalUSD;
    }

    function totalUSDvaults() public view returns(uint256) {

         uint256 total = 0;
         for (uint256 i = 0; i < poolInfo.length; ++i){
            total = total.add(totalUSDvault(i));
         }

         return total;
    }

    function GLPbackingNeeded() public view returns(uint256) {

        uint256 glpPrice = priceFeed.getGLPprice();

        return totalUSDvaults().mul(10**12).div(glpPrice);
    }

    function GLPinVault() public view returns(uint256) {

        return fsGLP.balanceOf(address(this));
    }

}

{
  "compilationTarget": {
    "vault.sol": "vault"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}