// Contract: Behodler
// Target function: function depositToAndCall(address to, bytes calldata data) external override payable returns (bool success)
 wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @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 sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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 mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function decimals() external returns (uint8);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}


interface IERC2612 {
    /**
     * @dev Sets `amount` 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:
     *
     * - `owner` cannot be the zero address.
     * - `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 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;

    /**
     * @dev Returns the current ERC2612 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);
}

interface IERC3156FlashBorrower {

    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param fee The additional amount of tokens to repay.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan"
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);
}


interface IERC3156FlashLender {

    /**
     * @dev The amount of currency available to be lended.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(
        address token
    ) external view returns (uint256);

    /**
     * @dev The fee to be charged for a given loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @return The amount of `token` to be charged for the loan, on top of the returned principal.
     */
    function flashFee(
        address token,
        uint256 amount
    ) external view returns (uint256);

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

/// @dev Wrapped Ether v10 (WETH10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain an WETH10 balance which can then be operated as an ERC-20 token. You can
/// `withdraw` ETH from WETH10, which will then burn WETH10 token in your wallet. The amount of WETH10 token in any wallet is always identical to the
/// balance of ETH deposited minus the ETH withdrawn with that specific wallet.
interface IWETH10 is IERC20, IERC2612, IERC3156FlashLender {

    /// @dev Returns current amount of flash-minted WETH10 token.
    function flashMinted() external view returns(uint256);

    /// @dev `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance.
    /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from zero address to caller account.
    function deposit() external payable;

    /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance.
    /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from zero address to `to` account.
    function depositTo(address to) external payable;

    /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to the same.
    /// Emits {Transfer} event to reflect WETH10 token burn of `value` to zero address from caller account. 
    /// Requirements:
    ///   - caller account must have at least `value` balance of WETH10 token.
    function withdraw(uint256 value) external;

    /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to account (`to`).
    /// Emits {Transfer} event to reflect WETH10 token burn of `value` to zero address from caller account.
    /// Requirements:
    ///   - caller account must have at least `value` balance of WETH10 token.
    function withdrawTo(address payable to, uint256 value) external;

    /// @dev Burn `value` WETH10 token from account (`from`) and withdraw matching ETH to account (`to`).
    /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`),
    /// unless allowance is set to `type(uint256).max`
    /// Emits {Transfer} event to reflect WETH10 token burn of `value` to zero address from account (`from`).
    /// Requirements:
    ///   - `from` account must have at least `value` balance of WETH10 token.
    ///   - `from` account must have approved caller to spend at least `value` of WETH10 token, unless `from` and caller are the same account.
    function withdrawFrom(address from, address payable to, uint256 value) external;

    /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance,
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// For more information on *transferAndCall* format, see https://github.com/ethereum/EIPs/issues/677.
    function depositToAndCall(address to, bytes calldata data) external payable returns (bool);

    /// @dev Sets `value` as allowance of `spender` account over caller account's WETH10 token,
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// For more information on approveAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);

    /// @dev Moves `value` WETH10 token from caller's account to account (`to`), 
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WETH10 token.
    /// For more information on transferAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function transferAndCall(address to, uint value, bytes calldata data) external returns (bool);
}

interface ITransferReceiver {
    function onTokenTransfer(address, uint, bytes calldata) external returns (bool);
}

interface IApprovalReceiver {
    function onTokenApproval(address, uint, bytes calldata) external returns (bool);
}

/// @dev Wrapped Ether v10 (WETH10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain an WETH10 balance which can then be operated as an ERC-20 token. You can
/// `withdraw` ETH from WETH10, which will then burn WETH10 token in your wallet. The amount of WETH10 token in any wallet is always identical to the
/// balance of ETH deposited minus the ETH withdrawn with that specific wallet.
contract WETH10 is IWETH10 {

    string public constant name = "WETH10";
    string public constant symbol = "WETH10";
    uint8  public override constant decimals = 18;

    bytes32 public immutable CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan");
    bytes32 public immutable PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    /// @dev Records amount of WETH10 token owned by account.
    mapping (address => uint256) public override balanceOf;

    /// @dev Records current ERC2612 nonce for account. This value must be included whenever signature is generated for {permit}.
    /// Every successful call to {permit} increases account's nonce by one. This prevents signature from being used multiple times.
    mapping (address => uint256) public override nonces;

    /// @dev Records number of WETH10 token that account (second) will be allowed to spend on behalf of another account (first) through {transferFrom}.
    mapping (address => mapping (address => uint256)) public override allowance;

    /// @dev Current amount of flash-minted WETH10 token.
    uint256 public override flashMinted;
    
    /// @dev Returns the total supply of WETH10 token as the ETH held in this contract.
    function totalSupply() external view override returns(uint256) {
        return address(this).balance + flashMinted;
    }

    /// @dev Fallback, `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance.
    /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from zero address to caller account.
    receive() external payable {
        // _mintTo(msg.sender, msg.value);
        balanceOf[msg.sender] += msg.value;
        emit Transfer(address(0), msg.sender, msg.value);
    }

    /// @dev `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance.
    /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from zero address to caller account.
    function deposit() external override payable {
        // _mintTo(msg.sender, msg.value);
        balanceOf[msg.sender] += msg.value;
        emit Transfer(address(0), msg.sender, msg.value);
    }

    /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance.
    /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from zero address to `to` account.
    function depositTo(address to) external override payable {
        // _mintTo(to, msg.value);
        balanceOf[to] += msg.value;
        emit Transfer(address(0), to, msg.value);
    }