// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

/**
 * @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;
    }
}

/**
 * @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);
    }
}

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);
}

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);
}

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 {}
}

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;
        }
    }
}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r,
                    bytes32 s) external;

    event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out,
               uint256 amount1Out, address indexed to);
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1,
                                                  uint32 blockTimestampLast);

    function price0CumulativeLast() external view returns (uint256);
    function price1CumulativeLast() external view returns (uint256);
    function kLast() external view returns (uint256);

    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;

    function skim(address to) external;
    function sync() external;
    function initialize(address, address) external;
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(address tokenA, address tokenB, uint256 amountADesired, uint256 amountBDesired,
                          uint256 amountAMin, uint256 amountBMin, address to, uint256 deadline)
                          external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    function addLiquidityETH(address token, uint256 amountTokenDesired, uint256 amountTokenMin,
                             uint256 amountETHMin, address to, uint256 deadline)
                             external payable returns (uint256 amountToken, uint256 amountETH,
                             uint256 liquidity);

    function removeLiquidity(address tokenA, address tokenB, uint256 liquidity, uint256 amountAMin,
                             uint256 amountBMin, address to, uint256 deadline) 
                             external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(address token, uint256 liquidity, uint256 amountTokenMin,
                                uint256 amountETHMin, address to, uint256 deadline) 
                                external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(address tokenA, address tokenB, uint256 liquidity,
                                       uint256 amountAMin, uint256 amountBMin, address to,
                                       uint256 deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s) 
                                       external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(address token, uint256 liquidity, uint256 amountTokenMin,
                                          uint256 amountETHMin, address to, uint256 deadline,
                                          bool approveMax, uint8 v, bytes32 r, bytes32 s) 
                                          external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(uint256 amountIn, uint256 amountOutMin, address[] calldata path,
                                      address to, uint256 deadline) 
                                      external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(uint256 amountOut, uint256 amountInMax, address[] calldata path,
                                      address to, uint256 deadline) 
                                      external returns (uint256[] memory amounts);

    function swapExactETHForTokens(uint256 amountOutMin, address[] calldata path, address to,
                                   uint256 deadline) 
                                   external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(uint256 amountOut, uint256 amountInMax, address[] calldata path,
                                   address to, uint256 deadline) 
                                   external returns (uint256[] memory amounts);

    function swapExactTokensForETH(uint256 amountIn, uint256 amountOutMin, address[] calldata path,
                                   address to, uint256 deadline) 
                                   external returns (uint256[] memory amounts);

    function swapETHForExactTokens(uint256 amountOut, address[] calldata path, address to,
                                   uint256 deadline) 
                                   external payable returns (uint256[] memory amounts);

    function quote(uint256 amountA, uint256 reserveA, uint256 reserveB) 
                   external pure returns (uint256 amountB);

    function getAmountOut(uint256 amountIn, uint256 reserveIn, uint256 reserveOut) 
                          external pure returns (uint256 amountOut);

    function getAmountIn(uint256 amountOut, uint256 reserveIn, uint256 reserveOut) 
                         external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
                           external view returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
                          external view returns (uint256[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(address token, uint256 liquidity,
        uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline) 
        external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(address token, uint256 liquidity,
        uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline, bool approveMax,
        uint8 v, bytes32 r, bytes32 s) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(uint256 amountIn, uint256 amountOutMin,
        address[] calldata path, address to, uint256 deadline) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(uint256 amountOutMin,
        address[] calldata path, address to, uint256 deadline) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(uint256 amountIn, uint256 amountOutMin,
        address[] calldata path, address to, uint256 deadline) external;
}

contract Superman is ERC20, Ownable { 
    using SafeMath for uint256;

    IUniswapV2Router02 public uniswapV2Router;

    address public uniswapV2Pair;
    address public DEAD = 0x000000000000000000000000000000000000dEaD;
    bool private swapping;
    bool public tradingEnabled = false;

    uint256 internal sellAmount = 1;
    uint256 internal buyAmount = 1;

    address payable public marketingWallet; 
  
    uint256 public swapTokensAtAmount;
    uint256 public sellMarketingFees;
    uint256 public buyMarketingFees;

    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) public automatedMarketMakerPairs;
    mapping(address => bool) private canTransferBeforeTradingIsEnabled;

    event SetPreSaleWallet(address wallet);
    event updateMarketingWallet(address wallet);
    event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress);
    event TradingEnabled();

    event Airdrop(address holder, uint256 amount);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event SendDividends(uint256 opAmount, bool success);

    constructor() ERC20("Superman", "$SUP") { 
        marketingWallet = payable(0x4A7Ccd75a4cE2F7BD39547e33a7E6584f5542557);  
        address router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; 
        
        buyMarketingFees = 2;
        sellMarketingFees = 2;

        uniswapV2Router = IUniswapV2Router02(router);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this), uniswapV2Router.WETH());

        _setAutomatedMarketMakerPair(uniswapV2Pair, true);

        _isExcludedFromFees[address(this)] = true;
        _isExcludedFromFees[msg.sender] = true;
        _isExcludedFromFees[marketingWallet] = true;

        // TOTAL SUPPLY IS SET HERE
        uint _totalSupply = 300_000_000 ether;
        _mint(owner(), _totalSupply); // only time internal mint function is ever called is to create supply
        swapTokensAtAmount = _totalSupply / 1000;
        canTransferBeforeTradingIsEnabled[owner()] = true;
        canTransferBeforeTradingIsEnabled[address(this)] = true;
    }

    // to allow the contract to receive eth back from the swap
    receive() external payable {}

    // for enable trading cannot stop trading once enabled
    function enableTrading() external onlyOwner {
        require(!tradingEnabled);
        tradingEnabled = true;
        emit TradingEnabled();
    }
    
    // for updating the marketing wallet
    function setMarketingWallet(address wallet) external onlyOwner {
        _isExcludedFromFees[wallet] = true;
        marketingWallet = payable(wallet);
        emit updateMarketingWallet(wallet);
    }

    // use for pre sale wallet, adds all exclusions to it
    function setPresaleWallet(address wallet) external onlyOwner {
        canTransferBeforeTradingIsEnabled[wallet] = true;
        _isExcludedFromFees[wallet] = true;
        emit SetPreSaleWallet(wallet);
    }     
    
    // to exclude or include a wallet from fees
    function setExcludeFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    // to recover bnb sent to contract by mistake
    function Sweep() external onlyOwner {
        uint256 amountBNB = address(this).balance;
        payable(msg.sender).transfer(amountBNB);
    }

    // for setting the token amount to trigger the swap
    function setSwapTriggerAmount(uint256 amount) public onlyOwner {
        swapTokensAtAmount = amount * (10**18);
    }

    // for setting additional pairs for taxes to be taken
    function setAutomatedMarketMakerPair(address pair, bool value) public onlyOwner {
        _setAutomatedMarketMakerPair(pair, value);
    }

    // sets the pairs
    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;

        emit SetAutomatedMarketMakerPair(pair, value);
    }

    // for checking if a wallet is excluded from fees
    function isExcludedFromFees(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }

    // controls all token movement
    function _transfer(address from, address to, uint256 amount) internal override {

        require(from != address(0), "IERC20: transfer from the zero address");
        require(to != address(0), "IERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        uint256 marketingFees;

        if (!canTransferBeforeTradingIsEnabled[from]) {
            require(tradingEnabled, "Trading has not yet been enabled");          
        }
        
        if (!swapping && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
            bool isSelling = automatedMarketMakerPairs[to];
            bool isBuying = automatedMarketMakerPairs[from];            
            
            if (!isBuying && !isSelling) {
                super._transfer(from, to, amount);
                return;
            }            
            
            else if (isSelling) {
                marketingFees = sellMarketingFees;
            } 
            
            else if (isBuying) {
                marketingFees = buyMarketingFees;
            }
            
            uint256 totalFees = marketingFees;

            uint256 contractTokenBalance = balanceOf(address(this));

            bool canSwap = contractTokenBalance >= swapTokensAtAmount;

            if (canSwap && isSelling && marketingFees > 0) {
                swapping = true;
                
                uint256 swapBalance = balanceOf(address(this));
                swapAndSendDividends(swapBalance);
                buyAmount = 1;
                sellAmount = 1;
                swapping = false;
            }

            uint256 fees = amount.mul(totalFees).div(100);

            amount = amount.sub(fees);

            if (isSelling) {
                sellAmount = sellAmount.add(fees);
            } else {
                buyAmount = buyAmount.add(fees);
            }

            super._transfer(from, address(this), fees);
            
        }

        super._transfer(from, to, amount);

    }

    // swaps collected tokens for eth for taxes
    function swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    // manual function to trigger the swap of collected tokens from taxes
    function forceSwapAndSendDividends(uint256 tokens) public onlyOwner {
        tokens = tokens * (10**18);
        uint256 totalAmount = buyAmount.add(sellAmount);
        uint256 fromBuy = tokens.mul(buyAmount).div(totalAmount);
        uint256 fromSell = tokens.mul(sellAmount).div(totalAmount);

        swapAndSendDividends(tokens);

        buyAmount = buyAmount.sub(fromBuy);
        sellAmount = sellAmount.sub(fromSell);
    }

    // sends the eth out to tax wallet
    function swapAndSendDividends(uint256 tokens) private {
        if (tokens == 0) {
            return;
        }
        swapTokensForEth(tokens);

        bool success = true;
        
        uint256 _completeFees = sellMarketingFees + buyMarketingFees;

        uint256 feePortions;
        if (_completeFees > 0) {
            feePortions = address(this).balance.div(_completeFees);
        }
        uint256 marketingPayout = buyMarketingFees.add(sellMarketingFees) * feePortions;
        
        if (marketingPayout > 0) {
            (success, ) = address(marketingWallet).call{value: marketingPayout}("");
        }

        emit SendDividends(
            marketingPayout,
            success
        );
    }
    
    // for airdrops to investors limited to 200 wallets at a time
    function airdropToWallets(
        address[] memory airdropWallets,
        uint256[] memory amount
    ) external onlyOwner {
        require(airdropWallets.length == amount.length, "Arrays must be the same length");
        require(airdropWallets.length <= 200, "Wallets list length must be <= 200");
        for (uint256 i = 0; i < airdropWallets.length; i++) {
            address wallet = airdropWallets[i];
            uint256 airdropAmount = amount[i] * (10**18);
            super._transfer(msg.sender, wallet, airdropAmount);
        }
    }
}