// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;
pragma experimental ABIEncoderV2;

abstract contract Ownable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _owner = msg.sender;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function transferOwner(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner shouldn't be zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    function ownershipRenounce() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}

library SafeERC20 {
    function safeTransfer(address token, address to, uint256 value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: INTERNAL TRANSFER_FAILED');
    }
}

interface IERC20 {
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external;
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline) external;

    function addLiquidityETH(address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
}

contract OpenServ is Ownable {
    string private constant _name = unicode"OpenServ";
    string private constant _symbol = unicode"SERV";
    uint256 private constant _totalSupply = 1_000_000_000 * 1e18;

    uint256 public maxTransactionAmount = 50_000 * 1e18; // 0.005%
    uint256 public maxWallet = 2_000_000 * 1e18;         // 0.20%
    uint256 public SwapTokensAtAmount = 200_000 * 1e18;  // 0.02%

    address private treasuryWallet = 0x8dB4ab33B7091d458F068A23A0Be88cF6fCd00F6;

    address private constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    uint8 public buyTotalFees = 50;
    uint8 public sellTotalFees = 50;

    uint8 public treasuryFee = 100;

    bool private swapping;
    bool public limitsInEffect = true;
    bool private launched;

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) private _isExcludedMaxTransactionAmount;
    mapping(address => bool) private automatedMarketMakerPairs;
    mapping (address => bool) public isBlackListed;

    event SwapAndLiquify(uint256 tokensSwapped, uint256 TreasuryETH);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event AddressBlackListed(address indexed account, bool isBlackListed);

    IUniswapV2Router02 public constant uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address public immutable uniswapV2Pair;

    constructor() {
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), WETH);
        automatedMarketMakerPairs[uniswapV2Pair] = true;

        setExcludedFromFees(owner(), true);
        setExcludedFromFees(address(this), true);
        setExcludedFromFees(address(0xdead), true);
        setExcludedFromFees(treasuryWallet, true);

        setExcludedFromMaxTransaction(owner(), true);
        setExcludedFromMaxTransaction(address(this), true);
        setExcludedFromMaxTransaction(address(uniswapV2Router), true);
        setExcludedFromMaxTransaction(address(0xdead), true);
        setExcludedFromMaxTransaction(address(uniswapV2Pair), true);
        setExcludedFromMaxTransaction(treasuryWallet, true);
        
        _balances[address(this)] = (_totalSupply * 25) / 100;
        _balances[address(treasuryWallet)] = (_totalSupply * 75) / 100;
        emit Transfer(address(0), address(this), _balances[address(this)]);
        emit Transfer(address(0), address(treasuryWallet), _balances[address(treasuryWallet)]);

        _approve(address(this), address(uniswapV2Router), type(uint256).max);
    }

    receive() external payable {}

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return 18;
    }

    function totalSupply() public pure returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        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);
    }

    function transfer(address recipient, uint256 amount) external returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
        uint256 currentAllowance = _allowances[sender][msg.sender];
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
            unchecked {
                _approve(sender, msg.sender, currentAllowance - amount);
            }
        }

        _transfer(sender, recipient, amount);

        return true;
    }

    function _transfer(address from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if (!launched && (from != owner() && from != address(this) && to != owner())) {
            revert("Trading not enabled");
        }

        if (isBlackListed[from] || isBlackListed[to]) {
            revert("Address is blacklisted");
        }

        if (limitsInEffect) {
            if (from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !swapping) {
                if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
                    require(amount <= maxTransactionAmount, "Buy transfer amount exceeds the maxTx");
                    require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
                } else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
                    require(amount <= maxTransactionAmount,"Sell transfer amount exceeds the maxTx");
                } else if (!_isExcludedMaxTransactionAmount[to]) {
                    require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
                }
            }
        }

        bool canSwap = balanceOf(address(this)) >= SwapTokensAtAmount;

        if (canSwap && !swapping && !automatedMarketMakerPairs[from] && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
            swapping = true;
            swapBack();
            swapping = false;
        }

        bool takeFee = !swapping;

        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }

        uint256 senderBalance = _balances[from];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");

        uint256 fees = 0;
        if (takeFee) {
            if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
                fees = (amount * sellTotalFees) / 1000;
            } else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
                fees = (amount * buyTotalFees) / 1000;
            }

            if (fees > 0) {
                unchecked {
                    amount = amount - fees;
                    _balances[from] -= fees;
                    _balances[address(this)] += fees;
                }
                emit Transfer(from, address(this), fees);
            }
        }
        unchecked {
            _balances[from] -= amount;
            _balances[to] += amount;
        }
        emit Transfer(from, to, amount);
    }

    function removeLimits() external onlyOwner {
        limitsInEffect = false;
    }

    function setDistributionFees(uint8 _TreasuryFee) external onlyOwner {
        treasuryFee = _TreasuryFee;
        require((treasuryFee) == 100, "Distribution have to be equal to 100%");
    }

    function setFees(uint8 _buyTotalFees, uint8 _sellTotalFees) external onlyOwner {
        require(_buyTotalFees <= 50, "Buy fees must be less than or equal to 5%");
        require(_sellTotalFees <= 50, "Sell fees must be less than or equal to 5%");
        buyTotalFees = _buyTotalFees;
        sellTotalFees = _sellTotalFees;
    }

    function setExcludedFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
    }

    function setExcludedFromMaxTransaction(address account, bool excluded) public onlyOwner {
        _isExcludedMaxTransactionAmount[account] = excluded;
    }

    function openTrade() external onlyOwner {
        require(!launched, "Already launched");
        launched = true;
    }

    function closeTrade() external onlyOwner {
        require(launched, "Already closed");
        launched = false;
    }

    function BlackListAddress(address account, bool blacklist) external onlyOwner {
        require(account != address(0), "Cannot blacklist zero address");
        require(account != owner(), "Cannot blacklist owner");
        isBlackListed[account] = blacklist;
        emit AddressBlackListed(account, blacklist);
    }

    function addLiquidity() external payable onlyOwner {
        require(!launched, "Already launched");
        uniswapV2Router.addLiquidityETH{value: msg.value}(
            address(this),
            _balances[address(this)],
            0,
            0,
            treasuryWallet,
            block.timestamp
        );
    }

    function setAutomatedMarketMakerPair(address pair, bool value) external onlyOwner {
        require(pair != uniswapV2Pair, "The pair cannot be removed");
        automatedMarketMakerPairs[pair] = value;
    }

    function setSwapAtAmount(uint256 newSwapAmount) external onlyOwner {
        require(newSwapAmount >= (totalSupply() * 1) / 100000, "Swap amount cannot be lower than 0.001% of the supply");
        require(newSwapAmount <= (totalSupply() * 5) / 1000, "Swap amount cannot be higher than 0.5% of the supply");
        SwapTokensAtAmount = newSwapAmount;
    }

    function setMaxTxnAmount(uint256 newMaxTx) external onlyOwner {
        require(newMaxTx >= ((totalSupply() * 1) / 10000) / 1e18, "Cannot set max transaction lower than 0.01%");
        maxTransactionAmount = newMaxTx * (10**18);
    }

    function setMaxWalletAmount(uint256 newMaxWallet) external onlyOwner {
        require(newMaxWallet >= ((totalSupply() * 1) / 1000) / 1e18, "Cannot set max wallet lower than 0.1%");
        maxWallet = newMaxWallet * (10**18);
    }

    function updateTreasuryWallet(address newAddress) external onlyOwner {
        require(newAddress != address(0), "Address cannot be zero");
        treasuryWallet = newAddress;
    }

    function excludedFromFee(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }

    function withdrawStuckToken(address token, address to) external onlyOwner {
        uint256 _contractBalance = IERC20(token).balanceOf(address(this));
        SafeERC20.safeTransfer(token, to, _contractBalance);
    }

    function withdrawStuckETH(address addr) external onlyOwner {
        require(addr != address(0), "Invalid address");

        (bool success, ) = addr.call{value: address(this).balance}("");
        require(success, "Withdrawal failed");
    }

    function swapBack() private {
        uint256 swapThreshold = SwapTokensAtAmount;
        bool success;

        if (balanceOf(address(this)) > SwapTokensAtAmount * 20) {
            swapThreshold = SwapTokensAtAmount * 20;
        }

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(swapThreshold, 0, path, address(this), block.timestamp);

        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            uint256 ethForTreasury = ethBalance;

            (success, ) = address(treasuryWallet).call{value: ethForTreasury}("");

            emit SwapAndLiquify(swapThreshold, ethForTreasury);
        }
    }
}

{
  "compilationTarget": {
    "OpenServ.sol": "OpenServ"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}