import 'dart:async';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/services.dart';
import 'package:flutter/material.dart';
import 'services/mattermost_auth_service.dart';
import 'services/push_notification_background.dart';
import 'services/push_notification_service.dart';
import 'services/workspace_launcher.dart';
import 'screens/workspace_home_page.dart';

final _navigatorKey = GlobalKey<NavigatorState>();
final _pushService = PushNotificationService();
final _launcher = WorkspaceLauncher();

Future<void> _applyFullscreenMode() async {
  await SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky);
  SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
    statusBarColor: Colors.transparent,
    systemNavigationBarColor: Colors.transparent,
    systemNavigationBarDividerColor: Colors.transparent,
  ));
}

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

  await _applyFullscreenMode();

  await Firebase.initializeApp();

  FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);

  _pushService.init();

  // Mattermost 자동 로그인 + FCM 토큰 서버 등록
  final authService = MattermostAuthService(_pushService);
  try {
    await authService.autoLoginAndRegister();
  } catch (e) {
    print('[Main] Mattermost auto-login failed: $e');
  }

  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'nomadcode-app',
      navigatorKey: _navigatorKey,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepPurple,
          brightness: Brightness.dark,
        ),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'nomadcode-app'),
      builder: (context, child) {
        _pushService.onNavigateToChannel = (serverUrl, channelId) {
          print('[Nav] Navigate to channel: $channelId on $serverUrl');
        };
        _pushService.onNavigateToThread = (serverUrl, rootId) {
          print('[Nav] Navigate to thread: $rootId on $serverUrl');
        };
        return child!;
      },
    );
  }
}

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

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

class _MyHomePageState extends State<MyHomePage> {
  StreamSubscription? _notifSub;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _applyFullscreenMode();
    });
    _notifSub = _pushService.onNotification.listen((data) {
      if (data['type'] != 'message') return;
      final message = data['message'] as String? ?? '';
      final channel = data['channel_name'] as String? ?? '';
      final sender = data['sender_name'] as String? ?? '';
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            sender.isNotEmpty ? '[$channel] $sender: $message' : message,
            maxLines: 2,
            overflow: TextOverflow.ellipsis,
          ),
          duration: const Duration(seconds: 4),
          behavior: SnackBarBehavior.floating,
        ),
      );
    });
  }

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

  @override
  Widget build(BuildContext context) {
    return WorkspaceHomePage(
      onLaunchCodeServer: (project) async {
        return _launcher.openCodeServer(project);
      },
    );
  }
}