import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'login_view.dart';
import 'jobs_view.dart';
import 'cargo_items_view.dart';
import 'chats_view.dart';
import 'chat_details_view.dart';
import 'settings_view.dart';
import 'models/job.dart';
import 'models/chat.dart';
import 'services/database_service.dart';
import 'services/chat_service.dart';
import 'app_state.dart';
import 'navigation_observer.dart';
import 'services/notification_service.dart';
import 'services/websocket_service.dart';
import 'l10n/app_localizations.dart';

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

  // Initialize SQLite database
  await DatabaseService().initialize();

  // Load data from database
  await AppState().loadLoginFromDatabase();

  // Load language preference
  await AppState().loadLanguagePreference();

  // Load jobs from database to trigger message type logging at startup
  await AppState().refreshJobsFromDatabase();

  // Prepare chat service before WebSocket events start flowing
  await ChatService().initialize();

  // Initialize notification service for local notifications with sound
  await NotificationService().initialize();

  // Note: WebSocket connection is initiated from the view that needs it:
  // - If userId exists: JobsView initiates connection on startup
  // - If no userId: LoginView initiates connection when login button is clicked

  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
  static const Duration _resumeReconnectThreshold = Duration(seconds: 30);
  final AppState _appState = AppState();
  final WebSocketService _webSocketService = WebSocketService();
  DateTime? _lastPausedAt;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.paused) {
      _lastPausedAt = DateTime.now();
      return;
    }

    if (state == AppLifecycleState.resumed) {
      final pausedAt = _lastPausedAt;
      _lastPausedAt = null;
      if (pausedAt == null) {
        return;
      }

      final standbyDuration = DateTime.now().difference(pausedAt);
      if (standbyDuration < _resumeReconnectThreshold ||
          !_appState.isLoggedIn) {
        return;
      }

      _webSocketService.reconnectForAppResume();
    }
  }

  @override
  Widget build(BuildContext context) {
    // Check if user is already logged in
    final initialRoute = _appState.isLoggedIn ? '/jobs' : '/login';

    return ValueListenableBuilder<Locale>(
      valueListenable: localeNotifier,
      builder: (context, locale, child) {
        return MaterialApp(
          title: 'VotianLT App',
          debugShowCheckedModeBanner: false,
          theme: ThemeData(
            colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
            useMaterial3: true,
          ),
          // Localization configuration
          locale: locale,
          localizationsDelegates: const [
            AppLocalizations.delegate,
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
            GlobalCupertinoLocalizations.delegate,
          ],
          supportedLocales:
              supportedLanguageCodes.map((code) => Locale(code)).toList(),
          navigatorObservers: [routeObserver],
          initialRoute: initialRoute,
          onGenerateRoute: (settings) {
            switch (settings.name) {
              case '/login':
                final arg = settings.arguments;
                final suppress = (arg is bool) ? arg : false;
                return MaterialPageRoute(
                  builder: (_) => LoginView(suppressConnectionSnack: suppress),
                );
              case '/jobs':
                return MaterialPageRoute(builder: (_) => const JobsView());
              case '/cargo_items':
                final job = settings.arguments as Job;
                return MaterialPageRoute(
                  builder: (_) => CargoItemsView(job: job),
                );
              case '/chats':
                return MaterialPageRoute(builder: (_) => const ChatsView());
              case '/chat_details':
                final chat = settings.arguments as Chat;
                return MaterialPageRoute(
                  builder: (_) => ChatDetailsView(chat: chat),
                );
              case '/settings':
                return MaterialPageRoute(builder: (_) => const SettingsView());
              default:
                return MaterialPageRoute(
                  builder:
                      (_) => const LoginView(suppressConnectionSnack: false),
                );
            }
          },
        );
      },
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('You have pushed the button this many times:'),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}