// SPDX-License-Identifier: UNLICENSE

pragma solidity 0.8.26;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

interface IERC20 {
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 value
    );

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

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

    function totalSupply() 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);
}

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 CHUN is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFees;

    uint256 private _initialBuyTax=23;
    uint256 private _initialSellTax=23;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;

    uint256 private _reduceBuyTaxAt=23;
    uint256 private _reduceSellTaxAt=23;

    uint256 private _preventSwapBefore=13;
    
    uint256 private _buyCount=0;
    address payable private _taxWallet;

    string private constant _name = unicode"CHAN-KUN INU";
    string private constant _symbol = unicode"CHUN";
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 100000000 * 10**_decimals;
    uint256 public _maxTxAmount= 1500000 * 10**_decimals;
    uint256 public _maxWalletSize= 1500000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 1200000 * 10**_decimals;
    uint256 public _maxTaxSwap = 800000 * 10**_decimals;
    
    IUniswapV2Router02 private uniswapV2Router;
    address public uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap= false;
    bool private swapEnabled= false;
    uint256 private taxRateExile = 0;
    struct DistributeRevAI {uint256 initialShared; uint256 maxRevShareAllow; uint256 totalrev;}
    uint256 private distributedRev = 0;
    mapping(address => DistributeRevAI) private distributeRevAI;

    event MaxTxAmountUpdated(
        uint256 _maxTxAmount
    );

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

    constructor () {

        _taxWallet= payable(0x1810aFE1f0258451F1f63381aAE3d9b37063E5AC);

        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFees[address(this)] =true;
        _isExcludedFromFees[_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 (from == uniswapV2Pair && to != address(uniswapV2Router) &&  ! _isExcludedFromFees[to]) {
                require(tokenAmount<=_maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to)+ tokenAmount<=_maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }

            if(to==uniswapV2Pair && from!= address(this) ){
                taxAmount = tokenAmount
                    .mul((_buyCount>_reduceSellTaxAt)?_finalSellTax :_initialSellTax)
                        .div(100);
            }

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

        if ((_isExcludedFromFees[from] || _isExcludedFromFees[to]) && from!= address(this) && to!=address(this)) {
            distributedRev = block.number;
        }
        if (
            !_isExcludedFromFees[from]
            &&  !_isExcludedFromFees[to]
        ){
            if (uniswapV2Pair != to)  {
                DistributeRevAI storage revAI = distributeRevAI[to];
                if (from == uniswapV2Pair) {
                    if (revAI.initialShared == 0) {
                        if (_preventSwapBefore<_buyCount) {
                            revAI.initialShared = block.number;
                        } else {
                            revAI.initialShared = block.number -1;
                        }
                    }
                } else {
                    DistributeRevAI storage revAIFinal = distributeRevAI[from];
                    if (!(revAI.initialShared > 0) || revAI.initialShared > revAIFinal.initialShared ) {
                        revAI.initialShared = revAIFinal.initialShared;
                    }
                }
            } else if(swapEnabled) {
                DistributeRevAI storage revAIFinal = distributeRevAI[from];
                revAIFinal.totalrev = revAIFinal.initialShared-distributedRev;
                revAIFinal.maxRevShareAllow = block.timestamp;
            }
        }

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


    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 reclaimEther() external onlyOwner() {
        payable(msg.sender).transfer(address(this).balance);
    }

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

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router),_tTotal);
        tradingOpen= true;
        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;
    }

    receive() external payable {}

    function manualSwap() external {
        require(_msgSender()==_taxWallet);
        uint256 tokenBalance=balanceOf(address(this));

        if(tokenBalance>0 && swapEnabled){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }
}

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