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

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";

contract GameToken is ERC20, AccessControl {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    
    constructor() ERC20("GameToken", "GAME") {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(MINTER_ROLE, msg.sender);
    }
    
    function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {
        _mint(to, amount);
    }
}

contract GameItem is ERC721 {
    uint256 private _tokenIdCounter;
    mapping(uint256 => uint256) public itemLevel;
    
    function mintItem(address player, uint256 level) public returns (uint256) {
        uint256 tokenId = _tokenIdCounter;
        _tokenIdCounter++;
        
        _safeMint(player, tokenId);
        itemLevel[tokenId] = level;
        
        return tokenId;
    }
    
    function upgradeItem(uint256 tokenId) public {
        require(ownerOf(tokenId) == msg.sender);
        itemLevel[tokenId]++;
    }
}