import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';

import 'core/config/app_config.dart';
import 'core/theme/app_theme.dart';
// import 'services/firebase_service.dart'; // Not needed for direct Firebase initialization
import 'services/gemini_service.dart';
import 'services/dialog_service.dart';
// TODO: Import models when Hive adapters are generated
import 'models/user_model.dart';
import 'models/menu_model.dart';
import 'models/recommendation_model.dart';
import 'screens/splash_screen.dart';
import 'core/constants/app_constants.dart';
import 'firebase_options.dart';

// Background message handler
@pragma('vm:entry-point')
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  // Only initialize if not already initialized
  if (Firebase.apps.isEmpty) {
    await Firebase.initializeApp(
      options: DefaultFirebaseOptions.currentPlatform,
    );
  }
  debugPrint('Handling a background message: ${message.messageId}');
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Set system UI overlay style
  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      statusBarIconBrightness: Brightness.dark,
      systemNavigationBarColor: Colors.white,
      systemNavigationBarIconBrightness: Brightness.dark,
    ),
  );

  // Set preferred orientations
  await SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown,
  ]);

  try {
    // Initialize Hive
    await Hive.initFlutter();

    // Register Hive adapters
    Hive.registerAdapter(UserModelAdapter());
    Hive.registerAdapter(UserPreferencesAdapter());
    Hive.registerAdapter(MenuModelAdapter());
    Hive.registerAdapter(RecommendationModelAdapter());
    Hive.registerAdapter(MenuRecommendationAdapter());

    // Open Hive boxes
    await Future.wait([
      Hive.openBox<UserModel>(AppConstants.userPreferencesBox),
      Hive.openBox<RecommendationModel>(AppConstants.recommendationsBox),
      Hive.openBox<MenuModel>(AppConstants.menusBox),
    ]);

    // Initialize Firebase (handle duplicate app error gracefully)
    try {
      if (Firebase.apps.isEmpty) {
        await Firebase.initializeApp(
          options: DefaultFirebaseOptions.currentPlatform,
        );
      }
      debugPrint('✅ Firebase initialized');
    } catch (e) {
      if (e.toString().contains('duplicate-app')) {
        debugPrint('⚠️ Firebase already initialized, using existing instance');
      } else {
        rethrow;
      }
    }

    // Set up background message handler
    FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

    // Initialize Gemini service
    try {
      await GeminiService().initialize();
      debugPrint('✅ Gemini service initialized');
    } catch (e) {
      debugPrint('⚠️ Gemini service initialization failed: $e');
      debugPrint('💡 Users can set their own API key in settings');
    }

    // Print configuration in debug mode
    AppConfig.printConfig();

    runApp(const ProviderScope(child: AmoriMenuRecommenderApp()));
  } catch (e) {
    debugPrint('Initialization error: $e');
    runApp(
      MaterialApp(
        home: Scaffold(
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                const Icon(Icons.error_outline, size: 64, color: Colors.red),
                const SizedBox(height: 16),
                const Text(
                  'Gagal menginisialisasi aplikasi',
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                ),
                const SizedBox(height: 8),
                Text(
                  'Error: $e',
                  textAlign: TextAlign.center,
                  style: const TextStyle(fontSize: 14, color: Colors.grey),
                ),
                const SizedBox(height: 24),
                ElevatedButton(
                  onPressed: () {
                    // Restart app
                    main();
                  },
                  child: const Text('Coba Lagi'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class AmoriMenuRecommenderApp extends ConsumerWidget {
  const AmoriMenuRecommenderApp({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return MaterialApp(
      title: AppConstants.appName,
      debugShowCheckedModeBanner: false,
      theme: AppTheme.lightTheme,
      darkTheme: AppTheme.darkTheme,
      themeMode: ThemeMode.system,
      // Global Keys for DialogService
      navigatorKey: DialogService().navigatorKey,
      scaffoldMessengerKey: DialogService().scaffoldMessengerKey,
      home: const SplashScreen(),
      builder: (context, child) {
        // Handle global errors
        ErrorWidget.builder = (FlutterErrorDetails errorDetails) {
          return Scaffold(
            body: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Icon(Icons.error_outline, size: 64, color: Colors.red),
                  const SizedBox(height: 16),
                  const Text(
                    'Terjadi kesalahan',
                    style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                  ),
                  const SizedBox(height: 8),
                  if (AppConfig.isDebugMode)
                    Padding(
                      padding: const EdgeInsets.all(16.0),
                      child: Text(
                        errorDetails.exception.toString(),
                        textAlign: TextAlign.center,
                        style: const TextStyle(
                          fontSize: 12,
                          color: Colors.grey,
                        ),
                      ),
                    ),
                  const SizedBox(height: 24),
                  ElevatedButton(
                    onPressed: () {
                      // Navigate back or restart
                      Navigator.of(context).pop();
                    },
                    child: const Text('Kembali'),
                  ),
                ],
              ),
            ),
          );
        };

        return child!;
      },
    );
  }
}