import { Analytics, getAnalytics } from "firebase/analytics";
import { FirebaseApp, getApp, getApps, initializeApp } from "firebase/app";
import { Auth, connectAuthEmulator, getAuth } from "firebase/auth";
import {
  Firestore,
  connectFirestoreEmulator,
  getFirestore,
} from "firebase/firestore";
import {
  Functions,
  connectFunctionsEmulator,
  getFunctions,
} from "firebase/functions";
import {
  FirebaseStorage,
  connectStorageEmulator,
  getStorage,
} from "firebase/storage";

const isEmulator = () => {
  const useEmulator = process.env.NEXT_PUBLIC_USE_FIREBASE_EMULATOR;
  return !!(useEmulator && useEmulator === "true");
};

export 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,
};

if (!getApps()?.length) {
  initializeApp(firebaseConfig);
}

export const firebaseApp = getApp();
export const firebaseAnalytics =
  typeof window !== "undefined" ? getAnalytics() : undefined;
export const firebaseStore = getFirestore();
export const firebaseStorage = getStorage();
export const firebaseAuth = getAuth();
export const firebaseFuncions = getFunctions();

// emulatorを使う場合はここで設定
if (isEmulator()) {
  connectAuthEmulator(firebaseAuth, "http://localhost:9099");
  connectFunctionsEmulator(firebaseFuncions, "localhost", 5001);
  connectFirestoreEmulator(firebaseStore, "localhost", 8080);
  connectStorageEmulator(firebaseStorage, "localhost", 9199);
}

type FirebaseClient = {
  firebaseApp: FirebaseApp;
  firebaseStore: Firestore;
  firebaseStorage: FirebaseStorage;
  firebaseAuth: Auth;
  firebaseFuncions: Functions;
  firebaseAnalytics?: Analytics;
};

export const firebaseClient: FirebaseClient = {
  firebaseApp,
  firebaseAnalytics,
  firebaseStore,
  firebaseStorage,
  firebaseAuth,
  firebaseFuncions,
};