import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:workmanager/workmanager.dart';
import 'app/app_bootstrap.dart';
import 'features/homes/services/geofence_notifications_service.dart';
import 'screens/homes_screen.dart';
import 'screens/remote_screen.dart';
import 'services/geofence_worker.dart';

/// Top-level callback для workmanager (выполняется в отдельном изоляте).
@pragma('vm:entry-point')
void callbackDispatcher() {
  DartPluginRegistrant.ensureInitialized();

  Workmanager().executeTask((taskName, inputData) async {
    if (taskName == geofenceTaskName) {
      return await executeGeofenceCheck();
    }
    return true;
  });
}

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await GeofenceNotificationsService().initialize();

  // Инициализация workmanager
  Workmanager().initialize(callbackDispatcher);

  runApp(const ProviderScope(child: IgnisApp()));
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Ignis',
      debugShowCheckedModeBanner: false,
      theme: ThemeData.dark(useMaterial3: true).copyWith(
        scaffoldBackgroundColor: const Color(0xFF0E0E0E),
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepOrange,
          brightness: Brightness.dark,
        ),
        appBarTheme: const AppBarTheme(
          backgroundColor: Color(0xFF1A1A1A),
          elevation: 0,
          centerTitle: true,
        ),
        cardTheme: CardThemeData(
          color: const Color(0xFF1E1E1E),
          elevation: 2,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
          ),
        ),
        sliderTheme: const SliderThemeData(
          trackHeight: 4,
          thumbShape: RoundSliderThumbShape(enabledThumbRadius: 8),
        ),
      ),
      home: const MainGate(),
    );
  }
}

/// Стартовый экран -- проверяет наличие домов и перенаправляет
class MainGate extends ConsumerStatefulWidget {
  const MainGate({super.key});

  @override
  ConsumerState<MainGate> createState() => _MainGateState();
}

class _MainGateState extends ConsumerState<MainGate> {
  @override
  void initState() {
    super.initState();
    Future.microtask(_bootstrap);
  }

  Future<void> _bootstrap() async {
    await ref.read(appBootstrapProvider.notifier).bootstrap();
    if (!mounted) return;

    final bootstrap = ref.read(appBootstrapProvider);
    switch (bootstrap.status) {
      case AppBootstrapStatus.ready:
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (_) => const RemoteScreen()),
        );
        break;
      case AppBootstrapStatus.noHomes:
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (_) => const HomesScreen()),
        );
        break;
      case AppBootstrapStatus.bootstrapping:
      case AppBootstrapStatus.authFailed:
      case AppBootstrapStatus.networkFailed:
      case AppBootstrapStatus.invalidConfig:
      case AppBootstrapStatus.failed:
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
    final bootstrap = ref.watch(appBootstrapProvider);
    final message = bootstrap.message;

    if (!bootstrap.isBootstrapping && message != null) {
      return Scaffold(
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(24),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                const Icon(
                  Icons.warning_amber_rounded,
                  color: Colors.deepOrange,
                  size: 56,
                ),
                const SizedBox(height: 16),
                const Text(
                  'Не удалось запустить приложение',
                  textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                ),
                const SizedBox(height: 8),
                Text(
                  message,
                  textAlign: TextAlign.center,
                  style: const TextStyle(color: Colors.white54),
                ),
                const SizedBox(height: 20),
                FilledButton.icon(
                  onPressed: _bootstrap,
                  icon: const Icon(Icons.refresh),
                  label: const Text('Повторить'),
                ),
                TextButton(
                  onPressed: () => Navigator.of(context).pushReplacement(
                    MaterialPageRoute(builder: (_) => const HomesScreen()),
                  ),
                  child: const Text('Открыть список домов'),
                ),
              ],
            ),
          ),
        ),
      );
    }

    return const Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            CircularProgressIndicator(color: Colors.deepOrange),
            SizedBox(height: 20),
            Text("Загрузка...", style: TextStyle(color: Colors.white54)),
          ],
        ),
      ),
    );
  }
}