firebase.js

// Import the functions you need from the SDKs you need
import { initializeApp, getApps, getApp } from "firebase/app";
import { getAuth } from "firebase/auth";
import { getDatabase } from "firebase/database";
// import { getAnalytics } from "firebase/analytics"; // Descomenta si usarás Analytics

// Your web app's Firebase configuration
const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL,
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_FIREBASE_MEASUREMENT_ID
};

// Initialize Firebase
// Evita la reinicialización en Next.js (HMR)
const app = !getApps().length ? initializeApp(firebaseConfig) : getApp();
const auth = getAuth(app);
const db = getDatabase(app);
// const analytics = getAnalytics(app); // Descomenta si usarás Analytics

// Exporta los servicios que necesitas
export { app, auth, db };