Contract

// SPDX-License-Identifier: MIT

/*
https://t.me/STRC_Token
*/


pragma solidity 0.8.27;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    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
    );
}

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

    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);
}

interface IUniswapV2Pair {
    function skim(address to) external;
    function sync() external;
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
}

interface IUniswapV2Router02 {
    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
        );
}

contract Contract is Context, IERC20, Ownable {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    address payable private _taxWallet;

    uint256 private initialBuyTaxRate = 18; // INITIAL_BUY_TAX
    uint256 private initialSellTaxRate = 18; // INITIAL_SELL_TAX
    uint256 private reducedBuyTaxRate = 0;
    uint256 private reducedSellTaxRate = 0;
    uint256 private buyTaxReductionThreshold = 18;
    uint256 private sellTaxReductionThreshold = 18;
    uint256 private swapEnabledThreshold = 18;
    uint256 private _buyCount = 0;

    uint8 private constant _decimals = 18;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    string private _name;
    string private _symbol;
    uint256 public maxTransactionAmount = (_tTotal * 2) / 100;
    uint256 public maxWalletAmount = (_tTotal * 2) / 100;
    uint256 public swapTokensAtAmount = (_tTotal * 1) / 100;
    uint256 public _maxTaxSwap = (_tTotal * 1) / 100;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;
    uint8 public maxSellsPerBlock = 3;
    bool public sellLimitActive = true;
    uint256 public totalSellCount = 0;
    uint256 public sellLimitRemovalThreshold = 18;
    event MaxTxAmountUpdated(uint256 maxTransactionAmount);
    event FeesUpdated(uint256 newBuyFee, uint256 newSellFee);
    event SellLimitRemoved();
    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor(string memory name_, string memory symbol_) payable {
        _name = name_;
        _symbol = symbol_;
        _taxWallet = payable(_msgSender());
        _balances[_msgSender()] = (_tTotal * 8.0) / 100;
        _balances[address(this)] = (_tTotal * 92.0) / 100;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;

        emit Transfer(address(0), _msgSender(), (_tTotal * 8.0) / 100);
        emit Transfer(address(0), address(this), (_tTotal * 92.0) / 100);
    }

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

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

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

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

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

    function transfer(address recipient, uint256 amount)
        public
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(sender, recipient, amount);
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - 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 min(uint256 a, uint256 b) private pure returns (uint256) {
        return (a < b) ? a : b;
    }

    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");

        uint256 taxAmount = 0;

        if (from != owner() && to != owner()) {
            if (!tradingOpen && (from == uniswapV2Pair || to == uniswapV2Pair)) {
                require(_isExcludedFromFee[from] || _isExcludedFromFee[to], "Trading not enabled yet");
            }
        }

        if (
            from == uniswapV2Pair &&
            to != address(uniswapV2Router) &&
            !_isExcludedFromFee[to]
        ) {
            require(amount <= maxTransactionAmount, "Exceeds the maxTransactionAmount.");
            _buyCount++;
            uint256 buyTaxRate = (_buyCount > buyTaxReductionThreshold) ? reducedBuyTaxRate : initialBuyTaxRate;
            if (buyTaxRate > 0) {
                taxAmount = (amount * buyTaxRate) / 100;
            }
            require(
                balanceOf(to) + amount - taxAmount <= maxWalletAmount,
                "Exceeds the maxWalletAmount."
            );
        }

        if (to == uniswapV2Pair && from != address(this) && !_isExcludedFromFee[from]) {
            uint256 sellTaxRate = (_buyCount > sellTaxReductionThreshold) ? reducedSellTaxRate : initialSellTaxRate;
            if (sellTaxRate > 0) {
                taxAmount = (amount * sellTaxRate) / 100;
            }
            if (sellLimitActive) {
                if (block.number > lastSellBlock) {
                    sellCount = 0;
                    lastSellBlock = block.number;
                }
                require(sellCount < maxSellsPerBlock, "Max sells per block reached");
                sellCount++;
            }
            unchecked { 
                ++totalSellCount;
            }
            // Check for auto-disable after incrementing
            if (sellLimitActive && totalSellCount >= sellLimitRemovalThreshold) {
                sellLimitActive = false;
                emit SellLimitRemoved();
            }
        }

        uint256 contractTokenBalance = balanceOf(address(this));
        if (
            !inSwap &&
            to == uniswapV2Pair &&
            swapEnabled &&
            contractTokenBalance > swapTokensAtAmount &&
            _buyCount > swapEnabledThreshold
        ) {
            uint256 swapAmount = min(amount, _maxTaxSwap);
            if (swapAmount > contractTokenBalance) {
                swapAmount = contractTokenBalance;
            }
            swapTokensForEth(swapAmount);
            uint256 contractETHBalance = address(this).balance;
            if (contractETHBalance > 0) {
                sendETHToFee(contractETHBalance);
            }
        }

        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)] + taxAmount;
            emit Transfer(from, address(this), taxAmount);
        }
        require(_balances[from] >= amount, "ERC20: transfer amount exceeds balance");
        _balances[from] = _balances[from] - amount;
        _balances[to] = _balances[to] + amount - taxAmount;
        emit Transfer(from, to, amount - taxAmount);
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function removeLimits() external onlyOwner {
        maxTransactionAmount = _tTotal;
        maxWalletAmount = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }


    function openTrading() public payable onlyOwner {

        require(!tradingOpen, "trading is already open");

        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );

        address pair = IUniswapV2Factory(uniswapV2Router.factory())
            .getPair(address(this), uniswapV2Router.WETH());

        if (pair == address(0)) {
            pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
                address(this),
                uniswapV2Router.WETH()
            );
        }

        uniswapV2Pair = pair;

        _isExcludedFromFee[uniswapV2Pair] = true;

        {
            (uint112 r0, uint112 r1, ) = IUniswapV2Pair(uniswapV2Pair).getReserves();
            uint256 balToken = IERC20(address(this)).balanceOf(uniswapV2Pair);
            uint256 balWeth = IERC20(uniswapV2Router.WETH()).balanceOf(uniswapV2Pair);

            if (balToken > r0 || balWeth > r1) {
                IUniswapV2Pair(uniswapV2Pair).skim(owner());
            }
            IUniswapV2Pair(uniswapV2Pair).sync();
        }

        uint256 contractBalance = balanceOf(address(this));
        require(contractBalance >= 92, "No tokens in contract");
        uint256 tokensForLiquidity = (contractBalance * 87) / 92; // TOKENS_LP_PERCENTAGE

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

        uniswapV2Router.addLiquidityETH{value: msg.value}(
            address(this),
            tokensForLiquidity,
            0,
            0,
            owner(),
            block.timestamp
        );
        IUniswapV2Pair(uniswapV2Pair).sync();

        swapEnabled = true;
        tradingOpen = true;
    }

    function reduceFee(uint256 _newBuyFee, uint256 _newSellFee) external onlyOwner {
        require(_newBuyFee <= 25, "Buy fee cannot exceed 25%");
        require(_newSellFee <= 25, "Sell fee cannot exceed 25%");
        reducedBuyTaxRate = _newBuyFee;
        reducedSellTaxRate = _newSellFee;
        emit FeesUpdated(_newBuyFee, _newSellFee);
    }
    function setSellLimitRemovalThreshold(uint256 newThreshold) external onlyOwner {
        require(newThreshold > 0, "Threshold must be > 0");
        sellLimitRemovalThreshold = newThreshold;
    }
    function setMaxSellsPerBlock(uint8 newMax) external onlyOwner {
        require(newMax > 0, "Max sells must be > 0");
        maxSellsPerBlock = newMax;
    }
    function setTaxWallet(address payable newTaxWallet) external onlyOwner {
        require(newTaxWallet != address(0), "Cannot set zero address");
        _taxWallet = newTaxWallet;
        _isExcludedFromFee[newTaxWallet] = true;
    }

    function getCurrentBuyFee() public view returns (uint256) {
        return _buyCount < buyTaxReductionThreshold ? initialBuyTaxRate : reducedBuyTaxRate;
    }

    function getCurrentSellFee() public view returns (uint256) {
        return _buyCount < sellTaxReductionThreshold ? initialSellTaxRate : reducedSellTaxRate;
    }

    function getBuyCount() public view returns (uint256) {
        return _buyCount;
    }
    function getTaxWallet() public view returns (address) {
        return _taxWallet;
    }

    receive() external payable {}

    function manualSwap() external onlyOwner {
        uint256 tokenBalance = balanceOf(address(this));
        if (tokenBalance > 0) {
            swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            sendETHToFee(ethBalance);
        }
    }
}