// SPDX-License-Identifier: Unlicensed

/**
POWERING THE DEMAND FOR NEXT GEN AI.

Website: https://www.nodeai.pro
Telegram: https://t.me/ainode_erc
Twitter: https://twitter.com/ainode_erc 
**/

pragma solidity 0.8.21;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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;
    }
}

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
    );
}

contract Ownable is Context {
    address private _owner;
    address private _preiousOwner;
    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);
    }

    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 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 GPU is Context, IERC20, Ownable {

    using SafeMath for uint256;

    string private constant _name = unicode"Node AI";
    string private constant _symbol = unicode"GPU";

    mapping(address => uint256) private _rOwnedBalance;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedAddress;
    uint8 private constant _decimals = 9;
    uint256 private constant MAXNUMBER = 10 ** 30;
    uint256 private constant _tTotal = 10 ** 9 * 10**9;
    uint256 private _rTotal = (MAXNUMBER - (MAXNUMBER % _tTotal));
    uint256 private _feeTotal;
    uint256 private _redisBuyTaxFee = 0;
    uint256 private _buyTaxFee = 23;
    uint256 private _redisSellTaxFee = 0;
    uint256 private _sellTaxFee = 23;

    uint256 private _redisFee = _redisSellTaxFee;
    uint256 private _taxFee = _sellTaxFee;

    uint256 private _prevRedisTaxFee = _redisFee;
    uint256 private _prevTaxFee = _taxFee;

    address payable private feeAddress1 = payable(0x1de260a00Db0d3be481EFEBAe57A0B5743f84E6a);
    address payable private feeAddress2 = payable(0x1de260a00Db0d3be481EFEBAe57A0B5743f84E6a);

    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    bool private isTradeOpened;
    bool private inswaps = false;
    bool private swapTaxActivated = true;

    uint256 public maxTxAmounts = 25 * 10 ** 6 * 10**9;
    uint256 public maxWalletAmounts = 25 * 10 ** 6 * 10**9;
    uint256 public minmumTaxSwap = 10 ** 4 * 10**9;

    event MaxTxAmountUpdated(uint256 maxTxAmounts);
    modifier lockTheSwap {
        inswaps = true;
        _;
        inswaps = false;
    }

    constructor() {

        _rOwnedBalance[_msgSender()] = _rTotal;

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);//
        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        _isExcludedAddress[owner()] = true;
        _isExcludedAddress[feeAddress1] = true;
        _isExcludedAddress[feeAddress2] = 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 tokenFromReflection(_rOwnedBalance[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 _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

    function restoreAllFee() private {
        _redisFee = _prevRedisTaxFee;
        _taxFee = _prevTaxFee;
    }

    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 removeLimits() external onlyOwner {
        maxTxAmounts = _rTotal;
        maxWalletAmounts = _rTotal;
        _redisBuyTaxFee = 0;
        _buyTaxFee = 3;
        _redisSellTaxFee = 0;
        _sellTaxFee = 3;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if (from != owner() && to != owner()) {
            if (!isTradeOpened) {
                require(from == owner(), "TOKEN: This account cannot send tokens until trading is enabled");
            }

            require(amount <= maxTxAmounts, "TOKEN: Max Transaction Limit");

            if(to != uniswapV2Pair) {
                require(balanceOf(to) + amount <= maxWalletAmounts, "TOKEN: Balance exceeds wallet size!");
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            bool canSwap = contractTokenBalance >= minmumTaxSwap;

            if(contractTokenBalance >= maxTxAmounts)
            {
                contractTokenBalance = maxTxAmounts;
            }

            if (canSwap && !inswaps && to == uniswapV2Pair && swapTaxActivated && !_isExcludedAddress[from] && amount > minmumTaxSwap) {
                swapTokensToETH(contractTokenBalance);
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }
        bool takeFee = true;
        if ((_isExcludedAddress[from] || _isExcludedAddress[to]) || (from != uniswapV2Pair && to != uniswapV2Pair)) {
            takeFee = false;
        } else {
            if(from == uniswapV2Pair && to != address(uniswapV2Router)) {
                _redisFee = _redisBuyTaxFee;
                _taxFee = _buyTaxFee;
            }

            //Set Fee for Sells
            if (to == uniswapV2Pair && from != address(uniswapV2Router)) {
                _redisFee = _redisSellTaxFee;
                _taxFee = _sellTaxFee;
            }

        }

        _basicTransfer(from, to, amount, takeFee);
    }

    function swapTokensToETH(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 sendETHToFee(uint256 amount) private {
        feeAddress2.transfer(amount);
    }

    function startTrade() public onlyOwner {
        isTradeOpened = true;
    }
    
    function removeAllFee() private {
        if (_redisFee == 0 && _taxFee == 0) return;

        _prevRedisTaxFee = _redisFee;
        _prevTaxFee = _taxFee;

        _redisFee = 0;
        _taxFee = 0;
    }

    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount,
        bool takeFee
    ) private {
        if (!takeFee) removeAllFee();
        _internalTransfer(sender, recipient, amount);
        if (!takeFee) restoreAllFee();
    }

    function _internalTransfer(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rFee,
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tTeam
        ) = _getValues(tAmount);
        if (!_isExcludedAddress[sender] || !isTradeOpened) {
            _rOwnedBalance[sender] = _rOwnedBalance[sender].sub(rAmount);
        }
        _rOwnedBalance[recipient] = _rOwnedBalance[recipient].add(rTransferAmount);
        _takeTeam(tTeam);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _takeTeam(uint256 tTeam) private {
        uint256 currentRate = _getRate();
        uint256 rTeam = tTeam.mul(currentRate);
        _rOwnedBalance[address(this)] = _rOwnedBalance[address(this)].add(rTeam);
    }

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _feeTotal = _feeTotal.add(tFee);
    }

    receive() external payable {}
    
    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 tokenFromReflection(uint256 rAmount)
        private
        view
        returns (uint256)
    {
        uint256 currentRate = _getRate();
        return rAmount.div(currentRate);
    }

    function _getValues(uint256 tAmount)
        private
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        (uint256 tTransferAmount, uint256 tFee, uint256 tTeam) =
            _getTValues(tAmount, _redisFee, _taxFee);
        uint256 currentRate = _getRate();
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) =
            _getRValues(tAmount, tFee, tTeam, currentRate);
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tTeam);
    }

    function _getTValues(
        uint256 tAmount,
        uint256 redisFee,
        uint256 taxFee
    )
        private
        pure
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 tFee = tAmount.mul(redisFee).div(100);
        uint256 tTeam = tAmount.mul(taxFee).div(100);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tTeam);
        return (tTransferAmount, tFee, tTeam);
    }

    function _getRValues(
        uint256 tAmount,
        uint256 tFee,
        uint256 tTeam,
        uint256 currentRate
    )
        private
        pure
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rTeam = tTeam.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rTeam);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns (uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }
}