multiplayer.js

import { initializeApp } from 'firebase/app';
import { getDatabase, ref, set, onValue } from 'firebase/database';

export function initMultiplayer(car) {
    const firebaseConfig = {
        apiKey: "YOUR_API_KEY",
        databaseURL: "https://YOUR_PROJECT.firebaseio.com"
    };
    
    const app = initializeApp(firebaseConfig);
    const db = getDatabase(app);
    
    // Update player position in Firebase
    function updatePosition() {
        set(ref(db, 'players/player1'), {
            x: car.position.x,
            y: car.position.y,
            z: car.position.z
        });
    }
    
    // Listen for other players
    onValue(ref(db, 'players'), (snapshot) => {
        const data = snapshot.val();
        // Update other cars in-game
    });
}