// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

interface IERC20 {
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    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);
}

interface ISwapRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
}

interface ISwapFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

abstract contract Ownable {
    address internal _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = msg.sender;
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "!owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0xdead));
        _owner = address(0xdead);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "new is 0");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract TokenDistributor {
    constructor (address token) {
        IERC20(token).approve(msg.sender, uint(~uint256(0)));
    }
}

abstract contract AbsToken is IERC20, Ownable {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    address public fundAddress;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    mapping(address => bool) public _feeWhiteList;

    uint256 private _tTotal;
    uint256 public maxTXAmount;

    ISwapRouter public _swapRouter;
    address public _fist;
    mapping(address => bool) public _swapPairList;
    bool private inSwap;

    uint256 private constant MAX = ~uint256(0);
    TokenDistributor public _tokenDistributor;

    uint256 public _buyFundFee = 500;
    uint256 public _sellFundFee = 500;

    uint256 public startTradeBlock;

    address public _mainPair;

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor (
        address RouterAddress, address FISTAddress,
        string memory Name, string memory Symbol, uint8 Decimals, uint256 Supply,
        address FundAddress, address ReceiveAddress
    ){
        _name = Name;
        _symbol = Symbol;
        _decimals = Decimals;

        ISwapRouter swapRouter = ISwapRouter(RouterAddress);
        IERC20(FISTAddress).approve(address(swapRouter), MAX);

        _fist = FISTAddress;
        _swapRouter = swapRouter;
        _allowances[address(this)][address(swapRouter)] = MAX;

        ISwapFactory swapFactory = ISwapFactory(swapRouter.factory());
        address swapPair = swapFactory.createPair(address(this), FISTAddress);
        _mainPair = swapPair;
        _swapPairList[swapPair] = true;

        uint256 total = Supply * 10 ** Decimals;
        maxTXAmount = Supply * 10 ** Decimals;
        walletLimit = Supply * 10 ** Decimals;

        _tTotal = total;

        _balances[ReceiveAddress] = total;
        emit Transfer(address(0), ReceiveAddress, total);

        fundAddress = FundAddress;

        _feeWhiteList[address(this)] = true;
        _feeWhiteList[address(swapRouter)] = true;
        _feeWhiteList[msg.sender] = true;


        isWalletLimitExempt[tx.origin] = true;
        isWalletLimitExempt[ReceiveAddress] = true;
        isWalletLimitExempt[address(swapRouter)] = true;
        isWalletLimitExempt[address(_mainPair)] = true;
        isWalletLimitExempt[address(this)] = true;
        isWalletLimitExempt[address(0xdead)] = true;


        _tokenDistributor = new TokenDistributor(FISTAddress);
    }

    mapping (address => bool) public isWalletLimitExempt;
    uint256 public walletLimit;
    bool public limitEnable = true;

    function setLimitEnable(bool status) public onlyOwner{
        limitEnable = status;
    }

    function setisWalletLimitExempt(address holder, bool exempt) external onlyOwner {
        isWalletLimitExempt[holder] = exempt;
    }

    function setMaxWalletLimit(uint256 newValue) public onlyOwner{
        walletLimit = newValue;
    }

    function symbol() external view override returns (string memory) {
        return _symbol;
    }

    function name() external view override returns (string memory) {
        return _name;
    }

    function decimals() external view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view 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(msg.sender, 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(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        if (_allowances[sender][msg.sender] != MAX) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender] - amount;
        }
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {

        uint256 balance = balanceOf(from);

        require(balance >= amount, "balanceNotEnough");

        bool takeFee;
        bool isSell;

        if (_swapPairList[from] || _swapPairList[to]) {
            if (!_feeWhiteList[from] && !_feeWhiteList[to]) {
                require(startTradeBlock > 0);

                if (_swapPairList[to]) {
                    if (!inSwap) {
                        uint256 contractTokenBalance = balanceOf(address(this));
                        if (contractTokenBalance > 0) {
                            uint256 swapFee = _buyFundFee  + _sellFundFee;
                            uint256 numTokensSellToFund = amount * swapFee / 5000;
                            if (numTokensSellToFund > contractTokenBalance) {
                                numTokensSellToFund = contractTokenBalance;
                            }
                            swapTokenForFund(numTokensSellToFund, swapFee);
                        }
                    }
                }
                takeFee = true;
            }
            if (_swapPairList[to]) {
                isSell = true;
            }
        }

        _tokenTransfer(from, to, amount, takeFee, isSell);
    }

    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 tAmount,
        bool takeFee,
        bool isSell
    ) private {
        _balances[sender] = _balances[sender] - tAmount;
        uint256 feeAmount;

        if (takeFee) {
            uint256 swapFee;

            if (isSell) {
                swapFee = _sellFundFee;
            } else {
                require(tAmount <= maxTXAmount);
                swapFee = _buyFundFee;
            }

            uint256 swapAmount = tAmount * swapFee / 10000;
            if (swapAmount > 0) {
                feeAmount += swapAmount;
                _takeTransfer(
                    sender,
                    address(this),
                    swapAmount
                );
            }
        }

        if(!isWalletLimitExempt[recipient] && limitEnable)
            require((balanceOf(recipient) + tAmount - feeAmount) <= walletLimit,"over max wallet limit");
        _takeTransfer(sender, recipient, tAmount - feeAmount);
    }


    event FAILED_swapExactTokensForTokensSupportingFeeOnTransferTokens();
    function swapTokenForFund(uint256 tokenAmount, uint256 swapFee) private lockTheSwap {
        swapFee += swapFee;

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _fist;
        try _swapRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(_tokenDistributor),
            block.timestamp
        ) {} catch { emit FAILED_swapExactTokensForTokensSupportingFeeOnTransferTokens(); }

        IERC20 FIST = IERC20(_fist);
        uint256 fistBalance = FIST.balanceOf(address(_tokenDistributor));
        uint256 fundAmount = fistBalance * (_buyFundFee + _sellFundFee) * 2 / swapFee;
        FIST.transferFrom(address(_tokenDistributor), fundAddress, fundAmount);
        // FIST.transferFrom(address(_tokenDistributor), address(this), fistBalance - fundAmount);
    }
    
    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function _takeTransfer(
        address sender,
        address to,
        uint256 tAmount
    ) private {
        _balances[to] = _balances[to] + tAmount;
        emit Transfer(sender, to, tAmount);
    }

    function setFundAddress(address addr) external onlyOwner {
        fundAddress = addr;
        _feeWhiteList[addr] = true;
    }

    function setMaxTxAmount(uint256 max) public onlyOwner {
        maxTXAmount = max;
    }

    function startTrade() external onlyOwner {
        startTradeBlock = block.number;
    }

    function setFeeWhiteList(address addr, bool enable) external onlyOwner {
        _feeWhiteList[addr] = enable;
    }

    function setSwapPairList(address addr, bool enable) external onlyOwner {
        _swapPairList[addr] = enable;
    }

    function claimBalance() external {
        payable(fundAddress).transfer(address(this).balance);
    }

    function claimToken(address token, uint256 amount, address to) external onlyOwner {
        IERC20(token).transfer(to, amount);
    }

    receive() external payable {}
}

contract Token is AbsToken {
    constructor() AbsToken(
        address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D),//Uni V2路由
        address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2),//WETH合约
        "KungFu Dragon",//Name
        "KFDragon",//Symbol
        9,//Decimals
        1000000000,//Supply
        address(0xdc69c681115224F07920eDCDb68e020e75b0198E),//营销钱包
        address(0xdc69c681115224F07920eDCDb68e020e75b0198E)//收币钱包
    ){
    }
}