import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:hive_flutter/hive_flutter.dart';

import 'injection.dart' as di;
import 'presentation/blocs/auth/auth_bloc.dart';
import 'presentation/blocs/auth/auth_event.dart';
import 'presentation/blocs/auth/auth_state.dart';
import 'presentation/blocs/server/server_bloc.dart';
import 'presentation/blocs/server/server_event.dart';
import 'presentation/blocs/action_mapping/action_mapping_bloc.dart';
import 'presentation/blocs/action_mapping/action_mapping_event.dart';
import 'presentation/screens/auth/login_screen.dart';
import 'presentation/screens/servers/server_list_screen.dart';
import 'presentation/screens/servers/servers_management_screen.dart';
import 'presentation/screens/servers/server_form_screen.dart';
import 'presentation/screens/action_mappings/action_mappings_list_screen.dart';
import 'presentation/screens/action_mappings/action_mapping_form_screen.dart';
import 'domain/entities/server.dart';
import 'domain/entities/action_mapping.dart';
import 'data/models/server_hive_model.dart';
import 'data/models/action_mapping_hive_model.dart';

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

  // Initialize Hive for local storage
  await Hive.initFlutter();

  // Register Hive adapters
  Hive.registerAdapter(ServerHiveModelAdapter());
  Hive.registerAdapter(ActionMappingHiveModelAdapter());

  // Initialize dependency injection
  await di.init();

  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (_) => di.sl<AuthBloc>()..add(const CheckAuthStatus()),
      child: MaterialApp.router(
        title: 'GeViAPI - Video Management System',
        debugShowCheckedModeBanner: false,
        theme: ThemeData(
          colorScheme: ColorScheme.fromSeed(
            seedColor: Colors.blue,
            brightness: Brightness.light,
          ),
          useMaterial3: true,
          appBarTheme: const AppBarTheme(
            centerTitle: false,
            elevation: 2,
          ),
          cardTheme: CardThemeData(
            elevation: 4,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(12),
            ),
          ),
          elevatedButtonTheme: ElevatedButtonThemeData(
            style: ElevatedButton.styleFrom(
              elevation: 2,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(8),
              ),
            ),
          ),
          inputDecorationTheme: InputDecorationTheme(
            border: OutlineInputBorder(
              borderRadius: BorderRadius.circular(8),
            ),
          ),
        ),
        routerConfig: _router,
      ),
    );
  }
}

final _router = GoRouter(
  routes: [
    GoRoute(
      path: '/login',
      builder: (context, state) => BlocProvider.value(
        value: context.read<AuthBloc>(),
        child: const LoginScreen(),
      ),
    ),
    GoRoute(
      path: '/',
      builder: (context, state) => BlocProvider.value(
        value: context.read<AuthBloc>(),
        child: const ServerListScreen(),
      ),
    ),
    ShellRoute(
      builder: (context, state, child) => BlocProvider(
        create: (_) => di.sl<ServerBloc>()..add(const LoadServers()),
        child: child,
      ),
      routes: [
        GoRoute(
          path: '/servers',
          builder: (context, state) => const ServersManagementScreen(),
        ),
        GoRoute(
          path: '/servers/create',
          builder: (context, state) {
            final serverType = state.uri.queryParameters['type'] == 'geviscope'
                ? ServerType.geviscope
                : ServerType.gcore;
            return ServerFormScreen(serverType: serverType);
          },
        ),
        GoRoute(
          path: '/servers/edit/:id',
          builder: (context, state) {
            final server = state.extra as Server;
            return ServerFormScreen(server: server, serverType: server.type);
          },
        ),
      ],
    ),
    ShellRoute(
      builder: (context, state, child) => BlocProvider(
        create: (_) => di.sl<ActionMappingBloc>()..add(const LoadActionMappings()),
        child: child,
      ),
      routes: [
        GoRoute(
          path: '/action-mappings',
          builder: (context, state) => const ActionMappingsListScreen(),
        ),
        GoRoute(
          path: '/action-mappings/create',
          builder: (context, state) => const ActionMappingFormScreen(),
        ),
        GoRoute(
          path: '/action-mappings/edit/:id',
          builder: (context, state) {
            final mapping = state.extra as ActionMapping;
            return ActionMappingFormScreen(mapping: mapping);
          },
        ),
      ],
    ),
  ],
  redirect: (context, state) {
    final authBloc = context.read<AuthBloc>();
    final authState = authBloc.state;

    final isLoginRoute = state.matchedLocation == '/login';

    if (authState is Authenticated) {
      // If authenticated and trying to access login, redirect to home
      if (isLoginRoute) {
        return '/';
      }
    } else {
      // If not authenticated and not on login page, redirect to login
      if (!isLoginRoute) {
        return '/login';
      }
    }

    // No redirect needed
    return null;
  },
  refreshListenable: GoRouterRefreshStream(
    di.sl<AuthBloc>().stream,
  ),
);

class GoRouterRefreshStream extends ChangeNotifier {
  GoRouterRefreshStream(Stream<dynamic> stream) {
    notifyListeners();
    _subscription = stream.asBroadcastStream().listen(
          (dynamic _) => notifyListeners(),
        );
  }

  late final StreamSubscription<dynamic> _subscription;

  @override
  void dispose() {
    _subscription.cancel();
    super.dispose();
  }
}