import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:insparkspokalen_ui/login/startPage.dart';
// import 'package:shared_preferences/shared_preferences.dart';
import '../layout/adminHomePage.dart';
import '../layout/userHomePage.dart';
import 'userService.dart';
import 'package:insparkspokalen_ui/models/userModel.dart';
import 'package:insparkspokalen_ui/services/teamUserSyncService.dart';
/*

  För att kräva login gör såhär:
  Lägg till detta paket i klassen ->
  import 'package:insparkspokalen_ui/services/googleAuthService.dart';

  Sedan lägg till följande för alla knappar som kräver att användaren är inloggad ->
  onPressed:() async {
            final isAuthenticated = await GoogleAuthService.ensureLoggedIn(context);
            if (!isAuthenticated) return;
          },

  Kör appen med detta kommando då vår konsol endast släpper in redirects från port 8080 via webben för tillfället
  flutter run -d chrome --web-port=8080
   */
class GoogleAuthService {
  // Singleton pattern for consistency
  static final GoogleAuthService _instance = GoogleAuthService._internal();
  factory GoogleAuthService() => _instance;
  GoogleAuthService._internal();

  // Current user state
  static UserModel? _currentUser;
  static UserModel? get currentUser => _currentUser;

  // Team sync service integration
  static final TeamUserSyncService _syncService = TeamUserSyncService();

  static final GoogleSignIn _googleSignIn = GoogleSignIn(
    clientId: '278095802777-40qt28sou07o3qb58pcoccl0eolas3k0.apps.googleusercontent.com', //web
    // clientId: '278095802777-8tj05ph2nbb8117abl1k4nlnq4ukd7ao.apps.googleusercontent.com', //android
    scopes: <String>['email', 'profile'],
  );

  // todo review this after final login solution is done
  static String? accessToken;

   // Getter for current user with null safety
  static UserModel? getCurrentUser() {
    return _currentUser;
  }

  // Set current user and sync with TeamUserSyncService
  static void setCurrentUser(UserModel user) {
    _currentUser = user;
    // Also update the sync service to maintain consistency
    _syncService.setCurrentUser(user);
  }

  static Future<void> signInWithGoogle(BuildContext context) async {
    try {
      await _googleSignIn.signOut(); // Optional: force fresh sign-in
      final account = await _googleSignIn.signIn();
      if (account == null) return;

      final auth = await account.authentication;
      accessToken = auth.accessToken;

      if (accessToken == null) {
        print("Missing access token.");
        return;
      }

      // Create or fetch user from backend
      await UserService.createOrFetchUser(account);

      //Fetch role from backend
      final email = account.email;
      final role = await UserService.getUserRole(email);

      // Creating a current user without photoURL 
      _currentUser = UserModel(
        email,
        account.displayName ?? "Unknown",
      );

      //Naviages to correct page based on role when you log in
      if (role == 'ADMIN') {
        Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => const AdminHomePage()));
      } else if (role == 'USER') {
        Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => const UserHomePage()));
      } else {
        print("Unknown role: $role");
      }
    } catch (e) {
      print("Google Sign-In failed: $e");
      // Show friendly error message to user
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Sign in failed. Please try again.')),
      );
    }
  }

  static Future<void> logout(BuildContext context) async {
    await _googleSignIn.signOut();

    // Clear cache when user logs out removed for now something went wrong with loading the cache
    // final prefs = await SharedPreferences.getInstance();
    // await prefs.remove('user');

    Navigator.pushAndRemoveUntil(
      context,
      MaterialPageRoute(builder: (_) => const StartPage()), // Import StartPage
          (route) => false,
    );
    accessToken = null;
  }
  
  static Future<bool> ensureLoggedIn(BuildContext context) async {
    if (!isLoggedIn()) {
      await signInWithGoogle(context);
    }
    return isLoggedIn();
  }
  static bool isLoggedIn() => accessToken != null;


  // Public method to get current google account 
  static GoogleSignInAccount? getCurrentGoogleAccount() {
    return _googleSignIn.currentUser;
  }

    // Method to refresh user data and team info
  static Future<void> refreshUserData() async {
    if (_currentUser != null) {
      // Trigger team data refresh in the sync service
      await _syncService.syncUserTeamData(_currentUser!.email);
    }
  }
}