import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:flux/features/attachments/data/attachments_repository.dart';
import 'package:flux/features/auth/bloc/auth_cubit.dart';
import 'package:flux/features/operations/data/operations_repository.dart';
import 'package:flux/l10n/app_localizations.dart';
import 'package:get_it/get_it.dart';
import 'package:go_router/go_router.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:supabase_flutter/supabase_flutter.dart';
import 'package:flux/core/blocs/session/session_cubit.dart';
import 'package:flux/core/data/core_repository.dart';
import 'package:flux/core/routes/app_router.dart';
import 'package:flux/core/theme/theme.dart';
import 'package:flux/core/theme/bloc/theme_bloc.dart';
import 'package:flux/features/customers/blocs/customers_cubit.dart';
import 'package:flux/features/customers/data/customer_repository.dart';
import 'package:flux/features/master_data/products/blocs/product_cubit.dart';
import 'package:flux/features/master_data/products/data/product_repository.dart';
import 'package:flux/features/master_data/providers/blocs/provider_cubit.dart';
import 'package:flux/features/master_data/providers/data/provider_repository.dart';
import 'package:flux/features/master_data/staff/blocs/staff_cubit.dart';
import 'package:flux/features/master_data/staff/data/staff_repository.dart';
import 'package:flux/features/master_data/store/bloc/store_cubit.dart';
import 'package:flux/features/master_data/store/data/store_repository.dart';
import 'package:flux/features/operations/blocs/operations_cubit.dart';
import 'package:flux/features/settings/settings.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await dotenv.load(fileName: ".env");

  // Inizializza le dipendenze PRIMA di lanciare l'app
  await setupLocator();

  runApp(
    MultiBlocProvider(
      providers: [
        BlocProvider<AuthCubit>(create: (context) => AuthCubit()),
        BlocProvider<ThemeBloc>(
          create: (context) => ThemeBloc()..add(LoadThemeEvent()),
        ),
        // Il Vigile Urbano viene inizializzato!
        BlocProvider<SessionCubit>(create: (_) => GetIt.I<SessionCubit>()),

        // Cubit delle feature
        BlocProvider<StoreCubit>(create: (_) => StoreCubit()),
        BlocProvider<CustomersCubit>(create: (_) => CustomersCubit()),
        BlocProvider<ProductsCubit>(create: (_) => ProductsCubit()),
        BlocProvider<StaffCubit>(create: (_) => StaffCubit()),
        BlocProvider<OperationsCubit>(create: (_) => OperationsCubit()),
        BlocProvider<ProvidersCubit>(create: (_) => ProvidersCubit()),
      ],
      child: const FluxApp(),
    ),
  );
}

Future<void> setupLocator() async {
  final GetIt getIt = GetIt.instance;

  getIt.registerSingleton<SharedPreferences>(
    await SharedPreferences.getInstance(),
  );

  await Supabase.initialize(
    url: dotenv.env['SUPABASE_URL'] ?? '',
    anonKey: dotenv.env['SUPABASE_ANON_KEY'] ?? '',
  );
  //await Supabase.instance.client.auth.signOut();
  getIt.registerSingleton<SupabaseClient>(Supabase.instance.client);

  // Settings
  getIt.registerLazySingleton<AppSettings>(() => AppSettings());

  // Repositories
  getIt.registerLazySingleton<CoreRepository>(
    () => CoreRepository(),
  ); // <-- NUOVO
  getIt.registerLazySingleton<StoreRepository>(() => StoreRepository());
  getIt.registerLazySingleton<CustomerRepository>(() => CustomerRepository());
  getIt.registerLazySingleton<ProductRepository>(() => ProductRepository());
  getIt.registerLazySingleton<StaffRepository>(() => StaffRepository());
  getIt.registerLazySingleton<OperationsRepository>(
    () => OperationsRepository(),
  );
  getIt.registerLazySingleton<ProviderRepository>(() => ProviderRepository());
  getIt.registerLazySingleton<AttachmentsRepository>(
    () => AttachmentsRepository(),
  );

  // NOTA: CompanyRepository l'ho tolto perché la logica della Company
  // ora è gestita dal CoreRepository durante l'Onboarding.
  // Se ti serve per altro, rimettilo pure!

  // Inizializziamo il SessionCubit (che prende CoreRepository e SharedPreferences)
  // Usiamo registerSingleton così viene creato subito e inizia ad ascoltare Supabase Auth.
  getIt.registerSingleton<SessionCubit>(
    SessionCubit(getIt<CoreRepository>(), getIt<SharedPreferences>()),
  );
}

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

  @override
  State<FluxApp> createState() => _FluxAppState();
}

class _FluxAppState extends State<FluxApp> {
  late final GoRouter _router;

  @override
  void initState() {
    super.initState();
    // Creiamo il router passandogli il Cubit per i redirect
    _router = AppRouter.createRouter(context.read<SessionCubit>());
    GetIt.I.get<SessionCubit>().setIsMobileDevice(isMobileDevice(context));
  }

  bool isMobileDevice(BuildContext context) {
    if (kIsWeb) {
      return false; // Il web non lo consideriamo "mobile nativo" per i deep link
    }
    return Platform.isAndroid || Platform.isIOS;
  }

  @override
  Widget build(BuildContext context) {
    // Il BlocConsumer unisce Listener e Builder in un colpo solo!
    return BlocConsumer<SessionCubit, SessionState>(
      // --- PARTE LISTENER (Il colpo di clacson in background) ---
      listenWhen: (previous, current) =>
          previous.status != SessionStatus.authenticated &&
          current.status == SessionStatus.authenticated,
      listener: (context, state) {
        // BAM! L'utente è dentro. Pre-carichiamo i Cubit leggeri.
        context.read<StoreCubit>().loadStores();
        context.read<StaffCubit>().loadAllStaff();
        context.read<ProvidersCubit>().loadProviders();
      },

      // --- PARTE BUILDER (La UI che viene disegnata a schermo) ---
      builder: (context, sessionState) {
        if (sessionState.status == SessionStatus.initial) {
          return _buildLoadingScreen();
        }

        return BlocBuilder<ThemeBloc, ThemeState>(
          builder: (context, themeState) {
            return MaterialApp.router(
              title: 'FLUX Gestionale',
              debugShowCheckedModeBanner: false,
              theme: fluxLightTheme,
              darkTheme: fluxDarkTheme,
              themeMode: themeState.currentTheme.themeMode,
              routerConfig: _router,
              localizationsDelegates: AppLocalizations.localizationsDelegates,
              supportedLocales: AppLocalizations.supportedLocales,
              locale: const Locale('it'),
            );
          },
        );
      },
    );
  }

  Widget _buildLoadingScreen() {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Icon(Icons.bolt, size: 64, color: Colors.blue),
              const SizedBox(height: 24),
              const CircularProgressIndicator(),
              const SizedBox(height: 16),
              const Text(
                "Inizializzazione sessione...",
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                  color: Colors.grey,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}