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

/// @title  bunker mode
/// @notice Fixed-supply ERC-20. No owner. No tax. No mint. No blacklist.
///         No trading switch. Pair is BUNKER/STRK on Uniswap v3, fee 1%.
///         This token is not STRK, not Starknet, and not StarkWare.
contract Bunker {
    string public constant name = "bunker STRK";
    string public constant symbol = "BUNKER";
    uint8 public constant decimals = 18;
    uint256 public constant totalSupply = 1_000_000_000 ether;

    string public constant pair = "BUNKER/STRK";
    address public constant STRK = 0xCa14007Eff0dB1f8135f4C25B34De49AB0d42766;
    string public constant subject = "https://x.com/EliBenSasson/status/2108110129572741426";

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);

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

    function transfer(address to, uint256 amount) external returns (bool) {
        _transfer(msg.sender, to, 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 from, address to, uint256 amount) external returns (bool) {
        uint256 allowed = allowance[from][msg.sender];
        if (allowed != type(uint256).max) {
            require(allowed >= amount, "allowance");
            allowance[from][msg.sender] = allowed - amount;
        }
        _transfer(from, to, amount);
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(to != address(0), "zero");
        require(balanceOf[from] >= amount, "balance");
        balanceOf[from] -= amount;
        balanceOf[to] += amount;
        emit Transfer(from, to, amount);
    }
}