// SPDX-License-Identifier: MIT

/**

FEW

*/

pragma solidity ^0.8.0;

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
    );
}

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;
    }
}

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);
}

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 TESTDONOTBUY 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;
    address payable private _taxWallet; // Marketing Wallet
    address private _stakingCA; // STAKING CA

    uint256 firstBlock;

    uint256 private _initialBuyTax = 20;
    uint256 private _initialSellTax = 20;
    uint256 private _finalBuyTax = 2;
    uint256 private _finalSellTax = 2;
    uint256 private _reduceBuyTaxAt = 1;
    uint256 private _reduceSellTaxAt = 1;
    uint256 private _preventSwapBefore = 1;
    uint256 private _buyCount = 0;

    uint8 private constant _decimals = 18;
    uint256 private constant _tTotal = 1000000000000 * 10 ** _decimals;
    string private constant _name =
        unicode"TESTDONOTBUY";
    string private constant _symbol = unicode"TESTDONOTBUY";
    uint256 public _maxTxAmount = 10000000000 * 10 ** _decimals;
    uint256 public _maxWalletSize = 10000000000 * 10 ** _decimals;
    uint256 public _taxSwapThreshold = 1000000 * 10 ** _decimals;
    uint256 public _maxTaxSwap = 1000000 * 10 ** _decimals;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    event ClearStuck(uint256 amount);
    event ClearToken(address TokenAddressCleared, uint256 Amount);

    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() {
        _taxWallet = payable(_msgSender());
        _balances[_msgSender()] = _tTotal - (_maxWalletSize * 5);
        _balances[address(this)] = (_maxWalletSize * 5);
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;

        emit Transfer(address(0), _msgSender(), _tTotal - (_maxWalletSize * 5));
    }

    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 _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);
        _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 _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");

        // Check for maxTxAmount and maxWalletSize
        if (from == uniswapV2Pair && !_isExcludedFromFee[to]) {
            require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
            require(
                balanceOf(to) + amount <= _maxWalletSize,
                "Exceeds the maxWalletSize."
            );

            if (firstBlock + 3 > block.number) {
                require(!isContract(to));
            }
            _buyCount++;
        } else if (to != uniswapV2Pair && !_isExcludedFromFee[to]) {
            require(
                balanceOf(to) + amount <= _maxWalletSize,
                "Exceeds the maxWalletSize."
            );
        }

        uint256 taxAmount = 0;

        // Allocating tax for marketing and staking based on buyCount
        uint256 stakingTax = 0;
        uint256 marketingTax = 0;

        if ((from != owner() && to != owner()) || to == _stakingCA) {
            if (
                from == uniswapV2Pair &&
                to != address(uniswapV2Router) &&
                !_isExcludedFromFee[to]
            ) {
                taxAmount = amount
                    .mul(
                        (_buyCount > _reduceBuyTaxAt)
                            ? _finalBuyTax
                            : _initialBuyTax
                    )
                    .div(100);
                    
            } else if (to == uniswapV2Pair && from != address(this)) {
                taxAmount = amount
                    .mul(
                        (_buyCount > _reduceSellTaxAt)
                            ? _finalSellTax
                            : _initialSellTax
                    )
                    .div(100);
            }


            if (_buyCount > _reduceBuyTaxAt && _buyCount > _reduceSellTaxAt) {
                stakingTax = taxAmount / 2;
            }
            
            marketingTax = taxAmount.sub(stakingTax);

            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 (stakingTax > 0) {
            _balances[_stakingCA] = _balances[_stakingCA].add(stakingTax);
            emit Transfer(from, _stakingCA, stakingTax);
        }

        if (marketingTax > 0) {
            _balances[address(this)] = _balances[address(this)].add(marketingTax);
            emit Transfer(from, address(this), marketingTax);
        }

        _balances[from] = _balances[from].sub(amount);

        _balances[to] = _balances[to].add(
            amount.sub(taxAmount)
        );

        emit Transfer(from, to, amount.sub(taxAmount));
    }

    function min(uint256 a, uint256 b) private pure returns (uint256) {
        return (a > b) ? b : a;
    }

    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 removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function setStakingCA(address stakingAddress) external onlyOwner {
        require(stakingAddress != address(0), "Invalid address provided");
        
        _stakingCA = stakingAddress;
        
        // Excluding staking contract from fees
        _isExcludedFromFee[_stakingCA] = true;

        // Transferring all available tokens from this contract to the staking contract
        uint256 availableTokens = _balances[address(this)];
        _balances[address(this)] = _balances[address(this)].sub(availableTokens);
        _balances[_stakingCA] = _balances[_stakingCA].add(availableTokens);

        emit Transfer(address(this), _stakingCA, availableTokens);
    }
    
    function sendETHToFee(uint256 amount) private {
        uint256 taxWalletShare = amount;
        _taxWallet.transfer(taxWalletShare);
    }

    function clearStuckToken(
        address tokenAddress,
        uint256 tokens
    ) external returns (bool success) {
        if (tokens == 0) {
            tokens = IERC20(tokenAddress).balanceOf(address(this));
        }
        emit ClearToken(tokenAddress, tokens);
        return IERC20(tokenAddress).transfer(_taxWallet, tokens);
    }

    function manualSend() external {
        require(
            address(this).balance > 0,
            "Contract balance must be greater than zero"
        );

        uint256 balance = address(this).balance; // Check
        payable(_taxWallet).transfer(balance); // Effects + Interaction
    }

    function manualSwap() external {
        uint256 tokenBalance = balanceOf(address(this));
        if (tokenBalance > 0) {
            swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            sendETHToFee(ethBalance);
        }
    }

    function openTrading() external onlyOwner {
        require(!tradingOpen, "trading is already open");
        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this),
            uniswapV2Router.WETH()
        );
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)),
            0,
            0,
            owner(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled = true;
        tradingOpen = true;
        firstBlock = block.number;
    }

    receive() external payable {}
}