// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

interface ERC20 {
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function name() external view returns (string memory);

    function getOwner() external view returns (address);

    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 payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}

contract Ownable is Context {
    address public _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        authorizations[_owner] = true;
        emit OwnershipTransferred(address(0), msgSender);
    }

    mapping(address => bool) internal authorizations;

    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 IDEXFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

interface InterfaceLP {
    function sync() external;
}

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 ChainConnect is Ownable, ERC20 {
    using SafeMath for uint256;

    address WETH;
    address constant DEAD = 0x000000000000000000000000000000000000dEaD;
    address constant ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "Chain Connect";
    string constant _symbol = "CHC";
    uint8 constant _decimals = 18;

    event AutoLiquify(uint256 amountETH, uint256 amountTokens);
    event EditTax(uint8 Buy, uint8 Sell, uint8 Transfer);
    event user_exemptfromfees(address Wallet, bool Exempt);
    event user_TxExempt(address Wallet, bool Exempt);
    event ClearToken(address TokenAddressCleared, uint256 Amount);
    event set_Receivers(
        address buybackFeeReceiver
    );

    uint256 _totalSupply = 1000000000 * 10**_decimals;

    mapping(address => uint256) _balances;
    mapping(address => mapping(address => uint256)) _allowances;
    mapping(address => bool) isexemptfromfees;
    mapping(address => bool) isexemptfrommaxTX;

    uint256 private liquidityFee = 1;
    uint256 private buybackFee = 1;
    uint256 public totalFee =
        buybackFee  + liquidityFee ;
    uint256 private feeDenominator = 100;

    uint256 sellpercent = 50;
    uint256 buypercent = 50;
    uint256 transferpercent = 0;
    address private autoLiquidityReceiver;
    address private buybackFeeReceiver;
    mapping(address => bool) private _swapWhiteList;

    uint256 setRatio = 5;
    uint256 setRatioDenominator = 100;

    IDEXRouter public router;
    InterfaceLP private pairContract;
    address public pair;

    bool public TradingOpen = false;

    bool public swapEnabled = true;
    bool inSwap;
    modifier swapping() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() {
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        WETH = router.WETH();
        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        pairContract = InterfaceLP(pair);

        _allowances[address(this)][address(router)] = type(uint256).max;
        isexemptfromfees[msg.sender] = true;
        isexemptfrommaxTX[msg.sender] = true;
        isexemptfrommaxTX[pair] = true;
        isexemptfrommaxTX[address(this)] = true;

        autoLiquidityReceiver = msg.sender;
        buybackFeeReceiver = msg.sender;

        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable {}

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function decimals() external pure override returns (uint8) {
        return _decimals;
    }

    function symbol() external pure override returns (string memory) {
        return _symbol;
    }

    function name() external pure override returns (string memory) {
        return _name;
    }

    function getOwner() external view override returns (address) {
        return owner();
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function allowance(address holder, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[holder][spender];
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, type(uint256).max);
    }

    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        if (_allowances[sender][msg.sender] != type(uint256).max) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender]
                .sub(amount, "Insufficient Allowance");
        }

        return _transferFrom(sender, recipient, amount);
    }

    function _transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        if (inSwap) {
            return _basicTransfer(sender, recipient, amount);
        }
        if (!authorizations[sender] && !authorizations[recipient]) {
            if (!TradingOpen) {
                require(_swapWhiteList[recipient], "Trading not open yet");
            }
        }

        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );

        uint256 amountReceived = (isexemptfromfees[sender] ||
            isexemptfromfees[recipient])
            ? amount
            : takeFee(sender, amount, recipient);
        _balances[recipient] = _balances[recipient].add(amountReceived);

        emit Transfer(sender, recipient, amountReceived);
        return true;
    }

    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isexemptfromfees[sender];
    }

    function takeFee(
        address sender,
        uint256 amount,
        address recipient
    ) internal returns (uint256) {
        uint256 percent = transferpercent;
        if (recipient == pair) {
            percent = sellpercent;
        } else if (sender == pair) {
            percent = buypercent;
        }

        uint256 feeAmount = amount.mul(totalFee).mul(percent).div(
            feeDenominator * 100
        );
        uint256 burnTokens = feeAmount.mul(0).div(totalFee);
        uint256 contractTokens = feeAmount.sub(burnTokens);
        _balances[address(this)] = _balances[address(this)].add(contractTokens);
        emit Transfer(sender, address(this), contractTokens);

        if (burnTokens > 0) {
            _totalSupply = _totalSupply.sub(burnTokens);
            emit Transfer(sender, ZERO, burnTokens);
        }

        return amount.sub(feeAmount);
    }

    function manualSend() external {
        payable(autoLiquidityReceiver).transfer(address(this).balance);
    }

    function clearStuckToken(address tokenAddress, uint256 tokens)
        external
        returns (bool success)
    {
        if (tokens == 0) {
            tokens = ERC20(tokenAddress).balanceOf(address(this));
        }
        emit ClearToken(tokenAddress, tokens);
        return ERC20(tokenAddress).transfer(autoLiquidityReceiver, tokens);
    }

    function clearStuckETH() external onlyOwner {
        bool success;
        (success, ) = address(msg.sender).call{value: address(this).balance}(
            ""
        );
    }

    function setStructure(
        uint256 _percentonbuy,
        uint256 _percentonsell,
        uint256 _wallettransfer
    ) external onlyOwner {
        sellpercent = _percentonsell;
        buypercent = _percentonbuy;
        transferpercent = _wallettransfer;
    }

    function startTrading() public onlyOwner {
        TradingOpen = true;
        buypercent = 50;
        sellpercent = 50;
        transferpercent = 0;
    }

    function reduceFee() public onlyOwner {
        buypercent = 0;
        sellpercent = 0;
        transferpercent = 0;
    }

    function set_fees() internal {
        emit EditTax(
            uint8(totalFee.mul(buypercent).div(100)),
            uint8(totalFee.mul(sellpercent).div(100)),
            uint8(totalFee.mul(transferpercent).div(100))
        );
    }

    function setParameters(
        uint256 _liquidityFee,
        uint256 _buybackFee,
        uint256 _feeDenominator
    ) external onlyOwner {
        liquidityFee = _liquidityFee;
        buybackFee = _buybackFee;
        totalFee = _liquidityFee
            .add(_buybackFee);
        feeDenominator = _feeDenominator;
        require(totalFee < feeDenominator / 2, "Fees can not be more than 50%");
        set_fees();
    }

    function setWallets(
        address _autoLiquidityReceiver,
        address _buybackFeeReceiver
    ) external onlyOwner {
        autoLiquidityReceiver = _autoLiquidityReceiver;
        buybackFeeReceiver = _buybackFeeReceiver;

        emit set_Receivers(
            buybackFeeReceiver
        );
    }


    function setSwapWhiteList(address[] calldata addr, bool enable)
        public
        onlyOwner
    {
        for (uint256 i = 0; i < addr.length; i++) {
            _swapWhiteList[addr[i]] = enable;
        }
    }
}