/**
 Website : Wenrefund.vip
 Twitter : http://Twitter.com/WENRFD
 Telegram :  https://t.me/wen_refund
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

interface IUniswapV2Factory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

interface IUniswapV2Router {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
}

interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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);
    }
}

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;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() external view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() external view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @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() external view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(
        address to,
        uint256 amount
    ) external virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(
        address spender,
        uint256 amount
    ) external virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        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
    ) external 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 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
    ) external virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /** @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");

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(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");

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(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);
            }
        }
    }

    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");

        uint256 fromBalance = _balances[from];
        require(
            fromBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);
    }
}

contract Refund is ERC20, Ownable {
    mapping(address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _sniper;

    address public _marketingWallet = 0x8f2Ed001f92fd4507E352C931DF4b62A82275B0f;
    address public _devWallet = 0x8f2Ed001f92fd4507E352C931DF4b62A82275B0f;

    uint256 public feesBuy = 2000;

    uint256 public _feesM = 5000;
    uint256 public _feesLp = 0;
    uint256 public _feesDev = 0;
    uint256 public feesSellTotal = _feesLp + _feesM + _feesDev;

    uint256 public _maxWallet;
    uint256 public _minTokensBeforeSwapping = 600;

    IUniswapV2Router public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
   
    bool public started;
    bool inSwapAndLiquify;

    modifier lockTheSwap() {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }

    constructor() ERC20("Wen Refund", "$WENRFD") {
        uint256 startSupply = 420e9 * 10 ** decimals();
        _mint(msg.sender, (startSupply));

        IUniswapV2Router _uniswapV2Router = IUniswapV2Router(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;

        _isExcludedFromFee[address(uniswapV2Router)] = true;
        _isExcludedFromFee[msg.sender] = true;

        _maxWallet = startSupply / 100;
        
        _approve(msg.sender, address(uniswapV2Router), type(uint256).max);
        _approve(address(this), address(uniswapV2Router), type(uint256).max);
    }

    function openTrading() external onlyOwner {
        started = true;
    }

    function removeSnipers(address[] calldata accounts) external onlyOwner {
        for (uint256 i = 0; i < accounts.length; i++) {
            _sniper[accounts[i]] = false;
        }
    }

    function addSnipers(address[] calldata accounts) external onlyOwner {
        uint256 len = accounts.length;
        for(uint256 i = 0; i < len;) {
            _sniper[accounts[i]] = true;
            unchecked {
                i++;
            }
        }
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(!_sniper[from], "Sniper rejected");
        if (
            _isExcludedFromFee[from] ||
            _isExcludedFromFee[to] ||
            inSwapAndLiquify
        ) {
            super._transfer(from, to, amount);
        } else {
            require(started, "Not open yet");
            uint taxAmount;
            if (to == uniswapV2Pair) {
                uint256 bal = balanceOf(address(this));
                uint256 threshold = balanceOf(uniswapV2Pair) * _minTokensBeforeSwapping / 10000;
                if (
                    bal >= threshold
                ) {
                    if (bal >= 3 * threshold) bal = 3 * threshold;
                    _swapAndLiquify(bal);
                }
                taxAmount = amount * feesSellTotal / 10000;
            } else if (from == uniswapV2Pair) {
                taxAmount = amount * feesBuy / 10000;
                require(
                    balanceOf(to) + amount - taxAmount <= _maxWallet,
                    "Transfer amount exceeds max wallet"
                );
            } else {
                require(
                    balanceOf(to) + amount <= _maxWallet,
                    "Transfer amount exceeds max wallet"
                );
            }
            super._transfer(from, to, amount - taxAmount);
            if (taxAmount > 0) {
                super._transfer(from, address(this), taxAmount);
            }
        }
    }

    function _swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        uint256 _feesSellTotal = feesSellTotal;
        if (_feesSellTotal == 0) return;
        uint256 feeTotal = _feesSellTotal - _feesLp / 2;
        uint256 toSell = contractTokenBalance * feeTotal / _feesSellTotal;

        _swapTokensForEth(toSell);
        uint256 balance = address(this).balance;

        uint256 toDev = balance * _feesDev / feeTotal;
        uint256 toMarketing = balance * _feesM / feeTotal;
        
        if (_feesLp > 0) {
            _addLiquidity(
                contractTokenBalance - toSell,
                balance - toDev - toMarketing
            );
        }
        if (toMarketing > 0) {
            payable(_marketingWallet).transfer(toMarketing);
        }

        if (address(this).balance > 0) {
            payable(_devWallet).transfer(address(this).balance);
        }
    }

    function _swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            (block.timestamp)
        );
    }

    function _addLiquidity(
        uint256 tokenAmount,
        uint256 ethAmount
    ) private lockTheSwap {
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            owner(),
            block.timestamp
        );
    }

    function getStatus(address a) external view returns(bool) {
        return _sniper[a];
    }

    function setDevWallet(address newWallet) external onlyOwner {
        _devWallet = newWallet;
    }

    function setMarketingWallet(address newWallet) external onlyOwner {
        _marketingWallet = newWallet;
    }

    function setMinTokens(uint256 newValue) external onlyOwner {
        _minTokensBeforeSwapping = newValue;
    }

    function excludeFromFees(address[] calldata addresses)
        external
        onlyOwner
    {
        for (uint256 i = 0; i < addresses.length; i++) {
            _isExcludedFromFee[addresses[i]] = true;
        }
    }

    function includeInFees(address[] calldata addresses)
        external
        onlyOwner
    {
        for (uint256 i = 0; i < addresses.length; i++) {
            _isExcludedFromFee[addresses[i]] = false;
        }
    }

    function editBuyFees(uint256 newValue) external onlyOwner {
        feesBuy = newValue;
    }

    function editSellFees(
        uint256 __feesDev,
        uint256 __feesLp,
        uint256 __feesM
    ) external onlyOwner {
        _feesDev = __feesDev;
        _feesLp = __feesLp;
        _feesM = __feesM;
        feesSellTotal = __feesDev + __feesLp + __feesM;
    }

    function setMaxWallet(uint256 __maxWallet) external onlyOwner {
        _maxWallet = __maxWallet;
    }

    function getStuckETH() external onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }

    function getStuckTokens(
        IERC20 tokenAddress,
        address walletAddress,
        uint256 amt
    ) external onlyOwner {
        uint256 bal = tokenAddress.balanceOf(address(this));
        IERC20(tokenAddress).transfer(
            walletAddress,
            amt > bal ? bal : amt
        );
    }

    receive() external payable {}
}