import { initializeApp, getApps, type FirebaseApp } from "firebase/app";
import { getAuth } from "firebase/auth";
import { getFirestore } from "firebase/firestore";
import { getStorage, type FirebaseStorage } from "firebase/storage";

const measurementId = process.env.NEXT_PUBLIC_FIREBASE_MEASUREMENT_ID;

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 ? { measurementId } : {}),
};

export const firebaseConfigured = Boolean(
  firebaseConfig.apiKey &&
    firebaseConfig.projectId &&
    firebaseConfig.appId
);

let app: FirebaseApp | null = null;

export function getFirebaseApp(): FirebaseApp | null {
  if (!firebaseConfigured) return null;
  if (!app) {
    app = getApps().length ? getApps()[0]! : initializeApp(firebaseConfig);
  }
  return app;
}

export function getFirebaseAuth() {
  const a = getFirebaseApp();
  return a ? getAuth(a) : null;
}

export function getDb() {
  const a = getFirebaseApp();
  return a ? getFirestore(a) : null;
}

export function getStorageBucket(): FirebaseStorage | null {
  const a = getFirebaseApp();
  return a ? getStorage(a) : null;
}