import AsyncStorage from "@react-native-async-storage/async-storage";
import {
  getReactNativePersistence,
  initializeAuth,
} from "firebase/auth/react-native";
import firebase from "firebase/compat/app";
import "firebase/compat/auth";
import "firebase/compat/firestore";
import "firebase/compat/functions";
import "firebase/compat/storage";
import { Platform } from "react-native";

const functionsInstances = {};
const emulatorConfigured = {};
const emulatorHost = Platform.OS === "web" ? "localhost" : "192.168.1.103";
const USE_FUNCTIONS_EMULATOR = false; // Toggle to route functions traffic to the local emulator.

const configureFunctionsEmulator = (instance, regionKey = "us-central1") => {
  const shouldUseEmulator = USE_FUNCTIONS_EMULATOR && instance?.useEmulator;

  if (!shouldUseEmulator || emulatorConfigured[regionKey]) {
    return;
  }

  try {
    instance.useEmulator(emulatorHost, 5001);
    emulatorConfigured[regionKey] = true;
  } catch (error) {
    console.warn(
      `[firebase] Unable to set functions emulator for region ${regionKey}`,
      error?.message
    );
  }
};

export const firebaseConfig = {
  apiKey: "AIzaSyCuHJHdwVN_F-VmUG4Hd7bGiMRqj6rPlLo",
  authDomain: "musicland-d33f9.firebaseapp.com",
  projectId: "musicland-d33f9",
  storageBucket: "musicland-d33f9.firebasestorage.app",
  messagingSenderId: "305598753437",
  appId: "1:305598753437:web:9930f10af59e5cf7f28274",
  measurementId: "G-RV4MS1SVTT",
};

if (!firebase?.apps?.filter(({ name_ }) => name_ === "[DEFAULT]").length) {
  const defaultApp = firebase.initializeApp(firebaseConfig);

  initializeAuth(defaultApp, {
    persistence: getReactNativePersistence(AsyncStorage),
  });

  // if (__DEV__) {
  //   firebase.functions().useEmulator("localhost", 5001);
  // }
  const defaultFunctions = firebase.functions();
  functionsInstances["us-central1"] = defaultFunctions;
  configureFunctionsEmulator(defaultFunctions, "us-central1");
  console.log("Firebase init");
}

// Firestore settings for React Native/iOS: avoid streaming transport issues
const firestore = firebase.firestore();
try {
  // Prefer auto-detect; disable fetch streams for RN iOS stability
  firebase.firestore().settings({
    experimentalAutoDetectLongPolling: true,
    useFetchStreams: false,
    ignoreUndefinedProperties: true,
  });
} catch (e) {
  // Ignore if settings were already set elsewhere
}

export const usersRef = firestore.collection("users");
export const projectsRef = firestore.collection("projects");
export const tasksRef = firestore.collection("tasks");
export const playlistsRef = firestore.collection("playlists");
export const chatsRef = firestore.collection("chats");
export const videosRef = firestore.collection("videos");
export const notificationsRef = firestore.collection("notifications");
export const reportsRef = firestore.collection("reports");

export const { arrayUnion, arrayRemove, increment, serverTimestamp } =
  firebase.firestore.FieldValue;
export const deleteField = firebase.firestore.FieldValue.delete;

export const getFunctionsClient = (region = "us-central1") => {
  const regionKey = region || "us-central1";

  if (!functionsInstances[regionKey]) {
    functionsInstances[regionKey] = firebase.app().functions(regionKey);
  }

  const instance = functionsInstances[regionKey];

  configureFunctionsEmulator(instance, regionKey);

  return instance;
};

export default firebase;