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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

/**
 * @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. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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/extensions/IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/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/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/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;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    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");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation 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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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/utils/Context.sol



// 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;
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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: contracts/DoughV1Dsa.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

import {IDoughV1Index, IAaveV3Pool, IAaveV3DataProvider, IAaveV3Oracle, IWETH, IUniswapV2Router, IDoughV1Flashloan} from "./Interfaces.sol";

contract DoughV1Dsa {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    /* ========== CONSTANTS ========== */
    address private constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address private constant WBTC = 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599;
    address private constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;

    address private constant AAVE_V3_POOL = 0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2;
    address private constant AAVE_V3_DATA_PROVIDER = 0x7B4EB56E7CD4b454BA8ff71E4518426369a138a3;
    address private constant AAVE_V3_ORACLE = 0x54586bE62E3c3580375aE3723C145253060Ca0C2;

    address private constant UNISWAP_V2_ROUTER = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    IUniswapV2Router private uniswap_v2_router = IUniswapV2Router(UNISWAP_V2_ROUTER);

    /* ========== STATE VARIABLES ========== */
    address public owner;
    address public DoughV1Index = address(0);
    address public doughFlashloan = address(0);

    /* ========== CONSTRUCTOR ========== */
    constructor(address _owner, address _DoughV1Index, address _doughFlashloan) {
        owner = _owner;
        DoughV1Index = _DoughV1Index;
        doughFlashloan = _doughFlashloan;
    }

    receive() external payable {}

    /* ========== Modifier ========== */
    modifier onlyOwner() {
        require(owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    modifier onlyAble() {
        require(msg.sender != address(0), "msg.sender is zero address");
        require(owner == msg.sender || IDoughV1Index(DoughV1Index).SHIELD_EXECUTOR() == msg.sender, "caller is not the owner or dough shield contract");
        _;
    }

    /* ========== VIEWS ========== */
    function balanceOfEth() external view returns (uint256) {
        return address(this).balance;
    }

    function balanceOfToken(address _tokenAddr) external view returns (uint256) {
        return IERC20(_tokenAddr).balanceOf(address(this));
    }

    function getUserData() external view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 totalCollateralBase, uint256 totalDebtBase, uint256 availableBorrowsBase, uint256 currentLiquidationThreshold, uint256 ltv, uint256 healthFactor) = IAaveV3Pool(AAVE_V3_POOL).getUserAccountData(address(this));
        return (totalCollateralBase, totalDebtBase, availableBorrowsBase, currentLiquidationThreshold, ltv, healthFactor);
    }

    function getPosition(address asset) external view returns (uint256, uint256, uint256) {
        (uint256 currentATokenBalance, uint256 currentStableDebt, uint256 currentVariableDebt, , , , , , ) = IAaveV3DataProvider(AAVE_V3_DATA_PROVIDER).getUserReserveData(asset, address(this));
        return (currentATokenBalance, currentStableDebt, currentVariableDebt);
    }

    function getAssetsPrices() external view returns (uint256, uint256, uint256) {
        uint256 price_weth = IAaveV3Oracle(AAVE_V3_ORACLE).getAssetPrice(WETH);
        uint256 price_wbtc = IAaveV3Oracle(AAVE_V3_ORACLE).getAssetPrice(WBTC);
        uint256 price_usdc = IAaveV3Oracle(AAVE_V3_ORACLE).getAssetPrice(USDC);
        return (price_weth, price_wbtc, price_usdc);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */
    function depositEthToDsa() external payable onlyOwner {
        require(msg.value > 0, "must be greater than zero");
        IWETH(WETH).deposit{value: msg.value}();
    }

    function depositTokenToDsa(address _tokenAddr, uint256 _amount) external onlyOwner {
        require(_amount > 0, "must be greater than zero");
        IERC20(_tokenAddr).transferFrom(owner, address(this), _amount);
    }

    function withdrawEthFromDsa(uint256 _amount) external onlyOwner {
        require(_amount > 0, "must be greater than zero");
        require(_amount <= address(this).balance, "must be less than balance of ETH");
        payable(owner).transfer(_amount);
    }

    function withdrawTokenFromDsa(address _tokenAddr, uint256 _amount) external onlyOwner {
        require(_amount > 0, "must be greater than zero");
        require(_amount <= IERC20(_tokenAddr).balanceOf(address(this)), "must be less than balance of token");
        if (_tokenAddr == WETH) {
            IWETH(WETH).withdraw(_amount);
            payable(owner).transfer(_amount);
        } else {
            IERC20(_tokenAddr).transfer(owner, _amount);
        }
    }

    function supplyToAaveV3(address asset, uint256 amount) external onlyOwner {
        IERC20(asset).approve(AAVE_V3_POOL, amount);
        IAaveV3Pool(AAVE_V3_POOL).supply(asset, amount, address(this), 0);
    }

    function withdrawFromAaveV3(address asset, uint256 amount, bool isClose) external onlyOwner {
        uint256 withdrawAmount = amount;
        if (isClose) {
            (withdrawAmount, , , , , , , , ) = IAaveV3DataProvider(AAVE_V3_DATA_PROVIDER).getUserReserveData(asset, address(this));
        }
        IAaveV3Pool(AAVE_V3_POOL).withdraw(asset, withdrawAmount, address(this));
    }

    function borrowFromAaveV3(address asset, uint256 amount) external onlyOwner {
        IAaveV3Pool(AAVE_V3_POOL).borrow(asset, amount, 2, 0, address(this));
    }

    function repayToAaveV3(address asset, uint256 amount, bool isClose) external onlyOwner returns (uint256) {
        uint256 repayAmount = amount;
        if (isClose) {
            (, , repayAmount, , , , , , ) = IAaveV3DataProvider(AAVE_V3_DATA_PROVIDER).getUserReserveData(asset, address(this));
        }
        IERC20(asset).approve(AAVE_V3_POOL, repayAmount);
        return IAaveV3Pool(AAVE_V3_POOL).repay(asset, repayAmount, 2, address(this));
    }

    function swapByUniswapV2(address assetIn, uint256 amountIn, address assetOut, uint256 amountOutMin) external onlyOwner returns (uint256) {
        IERC20(assetIn).approve(address(uniswap_v2_router), amountIn);
        address[] memory path;
        path = new address[](2);
        path[0] = assetIn;
        path[1] = assetOut;
        uint[] memory amounts = uniswap_v2_router.swapExactTokensForTokens(amountIn, amountOutMin, path, address(this), block.timestamp);
        return amounts[1];
    }

    function _calcFeeAmount(address _doughV1Index, uint256 amount) private view returns (uint256) {
        return (amount * IDoughV1Index(_doughV1Index).FLASHLOAN_FEE_TOTAL()) / 10000;
    }

    function flashloanForLoop(address loanToken, uint256 leverage) external onlyAble {
        require(loanToken == WETH || loanToken == WBTC, "invalid token.");
        require(leverage > 110, "must be greater than 110(1.1x)"); // decimals 2
        (uint256 currentATokenBalance, , , , , , , , ) = IAaveV3DataProvider(AAVE_V3_DATA_PROVIDER).getUserReserveData(loanToken, address(this));
        require(currentATokenBalance > 0, "supply first");

        uint256 loanAmountForLoop = (currentATokenBalance * (leverage - 100)) / 100;

        uint256 flashLoanFeeAmount = _calcFeeAmount(DoughV1Index, loanAmountForLoop);

        require(flashLoanFeeAmount < IERC20(loanToken).balanceOf(address(this)), "deploy token");
        IERC20(loanToken).approve(doughFlashloan, flashLoanFeeAmount);
        IDoughV1Flashloan(doughFlashloan).flashloanReq(loanToken, loanAmountForLoop, flashLoanFeeAmount, 0);
    }

    function flashloanForDeloop(address loanToken, uint256 loanAmount, bool isClose) external onlyAble {
        require(loanToken == WETH || loanToken == WBTC, "invalid token.");
        (, , uint256 currentVariableDebt, , , , , , ) = IAaveV3DataProvider(AAVE_V3_DATA_PROVIDER).getUserReserveData(loanToken, address(this));
        require(currentVariableDebt > 0, "Loop first");
        require(loanAmount <= currentVariableDebt, "loanAmount must be less than Debt");
        uint256 loanAmountForDeloop = loanAmount;
        if (isClose) {
            loanAmountForDeloop = currentVariableDebt;
        }

        uint256 flashLoanFeeAmount = _calcFeeAmount(DoughV1Index, loanAmountForDeloop);

        require(flashLoanFeeAmount < IERC20(loanToken).balanceOf(address(this)), "deploy token");
        IERC20(loanToken).approve(doughFlashloan, flashLoanFeeAmount);
        IDoughV1Flashloan(doughFlashloan).flashloanReq(loanToken, currentVariableDebt, flashLoanFeeAmount, 1);
    }

    function executeAction(address loanToken, uint256 loanAmount, uint256 funcId) external {
        require(msg.sender == doughFlashloan, "wrong doughFlashloan");
        IERC20(loanToken).transferFrom(doughFlashloan, address(this), loanAmount);
        IERC20(loanToken).approve(AAVE_V3_POOL, loanAmount);
        if (funcId == 0) {
            // Loop
            IAaveV3Pool(AAVE_V3_POOL).supply(loanToken, loanAmount, address(this), 0);
            IAaveV3Pool(AAVE_V3_POOL).borrow(loanToken, loanAmount, 2, 0, address(this));
        } else {
            // Deloop
            IERC20(loanToken).approve(AAVE_V3_POOL, loanAmount);
            IAaveV3Pool(AAVE_V3_POOL).repay(loanToken, loanAmount, 2, address(this));
            IAaveV3Pool(AAVE_V3_POOL).withdraw(loanToken, loanAmount, address(this));
        }
        IERC20(loanToken).approve(doughFlashloan, loanAmount);
    }
}

// File: contracts/DoughV1Index.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";

import "./DoughV1Dsa.sol";

contract DoughV1Index is Ownable {
    using Address for address;

    /* ========== CONSTANTS ========== */
    address private deadAddress = address(0x000000000000000000000000000000000000dEaD);

    /* ========== STATE VARIABLES ========== */
    address public TREASURY = address(0);
    uint256 public FLASHLOAN_FEE_TOTAL = 100; // 1 %

    mapping(address => address) private _DoughV1DsaList;

    address public doughV1Flashloan = address(0);

    address public doughV1Shield = address(0);
    address public SHIELD_EXECUTOR = address(0);
    uint256 public SHIELD_FEE_TOTAL = 500; // 5 %

    /* ========== CONSTRUCTOR ========== */
    constructor(address _treasury) {
        TREASURY = _treasury;
    }

    /* ========== VIEWS ========== */
    function getDoughV1Dsa(address _owner) external view returns (address) {
        return _DoughV1DsaList[_owner];
    }

    /* ========== MUTATIVE FUNCTIONS ========== */
    function withdrawToken(address _tokenAddr, uint256 _amount) external onlyOwner {
        require(_amount > 0, "must be greater than zero");
        uint256 balanceOfToken = IERC20(_tokenAddr).balanceOf(address(this));
        uint256 transAmount = _amount;
        if (_amount > balanceOfToken) {
            transAmount = balanceOfToken;
        }
        IERC20(_tokenAddr).transfer(owner(), transAmount);
    }

    function setTreasury(address _treasury) external onlyOwner {
        require(_treasury != deadAddress && _treasury != address(0), "treasury account error");
        TREASURY = _treasury;
    }

    function setShieldExecutor(address _shieldExecutor) external onlyOwner {
        require(_shieldExecutor != deadAddress && _shieldExecutor != address(0), "shieldExecutor account error");
        SHIELD_EXECUTOR = _shieldExecutor;
    }

    function setDoughFlashloan(address _doughV1Flashloan) external onlyOwner {
        require(_doughV1Flashloan != deadAddress && _doughV1Flashloan != address(0), "_doughV1Flashloan account error");
        doughV1Flashloan = _doughV1Flashloan;
    }

    function setDoughShield(address _doughV1Shield) external onlyOwner {
        require(_doughV1Shield != deadAddress && _doughV1Shield != address(0), "_doughV1Shield account error");
        doughV1Shield = _doughV1Shield;
    }

    function setFlashloanFeeTotal(uint256 _flashloanFee) external onlyOwner {
        // _flashloanFee > FLASHLOAN_PREMIUM_TOTAL ( in Aave V3 : 0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2)
        require(_flashloanFee > 0, "must be greater than zero.");
        FLASHLOAN_FEE_TOTAL = _flashloanFee;
    }

    function setShieldFeeTotal(uint256 _shieldoanFee) external onlyOwner {
        require(_shieldoanFee > 0, "must be greater than zero.");
        SHIELD_FEE_TOTAL = _shieldoanFee;
    }

    function buildDoughV1Dsa() external returns (address) {
        require(doughV1Flashloan != address(0), "_doughV1Flashloan account error");
        require(_DoughV1DsaList[msg.sender] == address(0), "created already");
        DoughV1Dsa newDoughV1Dsa = new DoughV1Dsa(msg.sender, address(this), doughV1Flashloan);
        _DoughV1DsaList[msg.sender] = address(newDoughV1Dsa);
        return address(newDoughV1Dsa);
    }
}

// File: contracts/Interfaces.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IWETH is IERC20 {
    function deposit() external payable;

    function withdraw(uint amount) external;
}

interface IDoughV1Index {
    function TREASURY() external view returns (address);

    function FLASHLOAN_FEE_TOTAL() external view returns (uint256);

    function SHIELD_EXECUTOR() external view returns (address);

    function SHIELD_FEE_TOTAL() external view returns (uint256);

    function doughV1Shield() external view returns (address);

    function owner() external view returns (address);
}

interface IDoughV1Dsa {
    function TREASURY() external view returns (address);

    function SHIELD_EXECUTOR() external view returns (address);

    function DoughV1Index() external view returns (address);

    function executeAction(address loanToken, uint256 loanAmount, uint256 funcId) external;
}

interface IAaveV3DataProvider {
    function getUserReserveData(
        address asset,
        address user
    ) external view returns (uint256 currentATokenBalance, uint256 currentStableDebt, uint256 currentVariableDebt, uint256 principalStableDebt, uint256 scaledVariableDebt, uint256 stableBorrowRate, uint256 liquidityRate, uint40 stableRateLastUpdated, bool usageAsCollateralEnabled);
}

interface IAaveV3Pool {
    function FLASHLOAN_PREMIUM_TOTAL() external view returns (uint128);

    function supply(address asset, uint256 amount, address onBehalfOf, uint16 referralCode) external;

    function withdraw(address asset, uint256 amount, address to) external;

    function borrow(address asset, uint256 amount, uint256 interestRateMode, uint16 referralCode, address onBehalfOf) external;

    function repay(address asset, uint256 amount, uint256 interestRateMode, address onBehalfOf) external returns (uint256);

    function getUserAccountData(address user) external view returns (uint256 totalCollateralBase, uint256 totalDebtBase, uint256 availableBorrowsBase, uint256 currentLiquidationThreshold, uint256 ltv, uint256 healthFactor);
}

interface IAaveV3Oracle {
    function getAssetPrice(address asset) external view returns (uint256);
}

interface IUniswapV2Router {
    function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts);
}

interface IDoughV1Flashloan {
    function flashloanReq(address loanToken, uint256 loanAmount, uint256 feeAmount, uint256 funcId) external;
}