import { initializeApp, getApps } from "firebase/app";
import { getAuth } from "firebase/auth";
import { getDatabase } from "firebase/database";

// As variáveis de ambiente devem ser configuradas no Vercel e no ficheiro .env.local
const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY || "AIzaSyCPz7Pd3tJj3QkF7fV_vudCJythNsyR57k",
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN || "namesa-429c1.firebaseapp.com",
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID || "namesa-429c1",
  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET || "namesa-429c1.firebasestorage.app",
  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID || "476421715902",
  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID || "1:476421715902:web:placeholder", // placeholder needed for web client SDK
  // Nota importante: Como verificado na codebase Android, 
  // O ReservaMesa usa Realtime Database e não Firestore.
  databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL || "https://namesa-429c1-default-rtdb.firebaseio.com"
};

// Initialize Firebase only if there are no apps initialized yet
const app = getApps().length === 0 ? initializeApp(firebaseConfig) : getApps()[0];

export const auth = getAuth(app);
export const db = getDatabase(app);
export default app;