/**
 * Firebase Native Implementation
 * Uses @react-native-firebase for Android/iOS
 */
import { Platform } from "react-native";
import auth, { FirebaseAuthTypes } from "@react-native-firebase/auth";
import firestore from "@react-native-firebase/firestore";
import messaging from "@react-native-firebase/messaging";
import functions from "@react-native-firebase/functions";
import {
  GoogleSignin,
  statusCodes,
} from "@react-native-google-signin/google-signin";

// Web Client ID from google-services.json
const WEB_CLIENT_ID =
  "613864011564-78d915g0hm9sbveskkfcch6mrd8atktb.apps.googleusercontent.com";

// iOS Client ID from GoogleService-Info.plist
const IOS_CLIENT_ID =
  "613864011564-atsg9nau8hicla4td6dedcab15g7qr04.apps.googleusercontent.com";

// Configure Google Sign-In for native
GoogleSignin.configure({
  webClientId: WEB_CLIENT_ID,
  iosClientId: Platform.OS === "ios" ? IOS_CLIENT_ID : undefined,
  offlineAccess: true,
});

// Export types
export type { FirebaseAuthTypes };
export { statusCodes };

// Auth exports
export const firebaseAuth = auth;
export const getAuthInstance = () => auth();
export const onAuthStateChanged = (
  callback: (user: FirebaseAuthTypes.User | null) => void
) => {
  return auth().onAuthStateChanged(callback);
};

// Firestore exports
export const firebaseFirestore = firestore;
export const getFirestoreInstance = () => firestore();
export const FieldValue = firestore.FieldValue;
export const Timestamp = firestore.Timestamp;

// Collection helpers
export const collection = (path: string) => firestore().collection(path);
export const doc = (collectionPath: string, docId: string) =>
  firestore().collection(collectionPath).doc(docId);

// Messaging exports
export const firebaseMessaging = messaging;
export const getMessagingInstance = () => messaging();
export const AuthorizationStatus = messaging.AuthorizationStatus;

// Functions exports
export const firebaseFunctions = functions;
export const getFunctionsInstance = () => functions();
export const httpsCallable = (name: string) => functions().httpsCallable(name);

// Google Sign-In (Native)
export const signInWithGoogle = async (): Promise<{
  user: FirebaseAuthTypes.User | null;
  isNewUser: boolean;
  error?: string;
}> => {
  try {
    // Check if device supports Google Play Services (Android only)
    if (Platform.OS === "android") {
      await GoogleSignin.hasPlayServices({
        showPlayServicesUpdateDialog: true,
      });
    }

    // Sign out first to always show account picker
    try {
      await GoogleSignin.signOut();
    } catch (e) {
      // Ignore sign out errors
    }

    // Sign in with Google
    const signInResult = await GoogleSignin.signIn();
    const idToken = signInResult.data?.idToken;

    if (!idToken) {
      return {
        user: null,
        isNewUser: false,
        error: "No ID token received from Google",
      };
    }

    // Create credential and sign in to Firebase
    const googleCredential = auth.GoogleAuthProvider.credential(idToken);
    const userCredential = await auth().signInWithCredential(googleCredential);
    const isNewUser = userCredential.additionalUserInfo?.isNewUser ?? false;

    return { user: userCredential.user, isNewUser };
  } catch (error: any) {
    console.error("Google Sign-In error:", error);

    if (error.code === statusCodes.SIGN_IN_CANCELLED) {
      return { user: null, isNewUser: false, error: "Sign in was cancelled" };
    } else if (error.code === statusCodes.IN_PROGRESS) {
      return {
        user: null,
        isNewUser: false,
        error: "Sign in is already in progress",
      };
    } else if (error.code === statusCodes.PLAY_SERVICES_NOT_AVAILABLE) {
      return {
        user: null,
        isNewUser: false,
        error: "Google Play Services not available",
      };
    }

    // Handle iOS-specific errors
    if (Platform.OS === "ios" && error.message?.includes("simulator")) {
      return {
        user: null,
        isNewUser: false,
        error:
          "Google Sign-In may not work on iOS Simulator. Please test on a real device.",
      };
    }

    return {
      user: null,
      isNewUser: false,
      error: error.message || "Google Sign-In failed",
    };
  }
};

export const signOutFromGoogle = async (): Promise<void> => {
  try {
    await GoogleSignin.signOut();
  } catch (error) {
    console.error("Google Sign-Out error:", error);
  }
};

// Phone Auth (Native)
export const signInWithPhoneNumber = async (phoneNumber: string) => {
  return auth().signInWithPhoneNumber(phoneNumber);
};

// Email/Password Authentication (Native)
export const createUserWithEmailAndPassword = async (
  email: string,
  password: string
): Promise<{ user: FirebaseAuthTypes.User | null; error?: string }> => {
  try {
    const userCredential = await auth().createUserWithEmailAndPassword(
      email,
      password
    );
    return { user: userCredential.user };
  } catch (error: any) {
    console.error('Email/Password signup error:', error);
    return {
      user: null,
      error: error.message || 'Failed to create account',
    };
  }
};

export const signInWithEmailAndPassword = async (
  email: string,
  password: string
): Promise<{ user: FirebaseAuthTypes.User | null; error?: string }> => {
  try {
    const userCredential = await auth().signInWithEmailAndPassword(
      email,
      password
    );
    return { user: userCredential.user };
  } catch (error: any) {
    console.error('Email/Password signin error:', error);
    return {
      user: null,
      error: error.message || 'Failed to sign in',
    };
  }
};

// Firebase Auth sign out
export const signOut = async (): Promise<void> => {
  await signOutFromGoogle();
  await auth().signOut();
};

// Platform identifier
export const isNative = true;
export const isWeb = false;