config.ts

import { initializeApp, getApps, FirebaseApp } from 'firebase/app';
import { getAuth, connectAuthEmulator } from 'firebase/auth';
import { getFirestore, connectFirestoreEmulator } from 'firebase/firestore';
import { getStorage, ref, uploadBytes, getDownloadURL } from 'firebase/storage';

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  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 app
export const firebaseApp: FirebaseApp =
  getApps().length === 0 ? initializeApp(firebaseConfig) : getApps()[0];

export const auth = getAuth(firebaseApp);
export const firestore = getFirestore(firebaseApp);
export const storage = getStorage(firebaseApp);

// Enable offline persistence for Firestore
if (typeof window !== 'undefined') {
  // Only run on client side
  import('firebase/firestore').then(({ enableNetwork, disableNetwork }) => {
    // Enable network by default
    enableNetwork(firestore);
  });
}

export async function uploadFileToFirebase(file: File, folder: string): Promise<string> {
  const storageRef = ref(storage, `${folder}/${file.name}`);
  const snapshot = await uploadBytes(storageRef, file);
  return await getDownloadURL(snapshot.ref);
}