JUJU (JUJU)

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

contract JujuToken {
    // --- ERC20 basics ---
    string public constant name = "JUJU";
    string public constant symbol = "JUJU";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;

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

    // --- Owner / Minter ---
    address public owner;
    mapping(address => bool) public isMinter;

    // --- Events ---
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event MinterGranted(address indexed minter);
    event MinterRevoked(address indexed minter);

    // --- Modifiers ---
    modifier onlyOwner() { require(msg.sender == owner, "not owner"); _; }
    modifier onlyMinter() { require(isMinter[msg.sender], "not minter"); _; }

    constructor() {
        owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    // --- Owner controls ---
    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "zero");
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

    function grantMinter(address m) external onlyOwner {
        isMinter[m] = true;
        emit MinterGranted(m);
    }

    function revokeMinter(address m) external onlyOwner {
        isMinter[m] = false;
        emit MinterRevoked(m);
    }

    // --- ERC20 ---
    function _transfer(address from, address to, uint256 amount) internal {
        require(to != address(0), "to zero");
        uint256 bal = balanceOf[from];
        require(bal >= amount, "bal");
        unchecked { balanceOf[from] = bal - amount; }
        balanceOf[to] += amount;
        emit Transfer(from, to, amount);
    }

    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];
        require(allowed >= amount, "allow");
        if (allowed != type(uint256).max) {
            unchecked { allowance[from][msg.sender] = allowed - amount; }
        }
        _transfer(from, to, amount);
        return true;
    }

    // --- Mint (only splitter will call) ---
    function mint(address to, uint256 amount) external onlyMinter {
        totalSupply += amount;
        balanceOf[to] += amount;
        emit Transfer(address(0), to, amount);
    }
}