import 'dart:io';

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:provider/provider.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:simplecloudnotifier/api/api_client.dart';
import 'package:simplecloudnotifier/models/channel.dart';
import 'package:simplecloudnotifier/models/client.dart';
import 'package:simplecloudnotifier/models/scn_message.dart';
import 'package:simplecloudnotifier/nav_layout.dart';
import 'package:simplecloudnotifier/pages/channel_view/channel_view.dart';
import 'package:simplecloudnotifier/pages/message_view/message_view.dart';
import 'package:simplecloudnotifier/settings/app_settings.dart';
import 'package:simplecloudnotifier/state/app_bar_state.dart';
import 'package:simplecloudnotifier/state/app_events.dart';
import 'package:simplecloudnotifier/state/app_theme.dart';
import 'package:simplecloudnotifier/state/application_log.dart';
import 'package:simplecloudnotifier/state/fb_message.dart';
import 'package:simplecloudnotifier/state/globals.dart';
import 'package:simplecloudnotifier/state/request_log.dart';
import 'package:simplecloudnotifier/state/app_auth.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:simplecloudnotifier/state/scn_data_cache.dart';
import 'package:simplecloudnotifier/utils/navi.dart';
import 'package:simplecloudnotifier/utils/notifier.dart';
import 'package:toastification/toastification.dart';
import 'firebase_options.dart';

void main() async {
  print('[INIT] Application starting...');

  print('[INIT] Ensure WidgetsFlutterBinding...');

  WidgetsFlutterBinding.ensureInitialized();

  print('[INIT] Init Globals...');

  await Globals().init();

  print('[INIT] Init Hive...');

  await Hive.initFlutter();

  Hive.registerAdapter(SCNRequestAdapter());
  Hive.registerAdapter(SCNLogAdapter());
  Hive.registerAdapter(SCNLogLevelAdapter());
  Hive.registerAdapter(SCNMessageAdapter());
  Hive.registerAdapter(ChannelAdapter());
  Hive.registerAdapter(FBMessageAdapter());

  print('[INIT] Load Hive<scn-logs>...');

  try {
    await Hive.openBox<SCNLog>('scn-logs');
  } catch (exc, trace) {
    Hive.deleteBoxFromDisk('scn-logs');
    await Hive.openBox<SCNLog>('scn-logs');
    ApplicationLog.error('Failed to open Hive-Box: scn-logs: ' + exc.toString(), trace: trace);
  }

  print('[INIT] Load Hive<scn-requests>...');

  try {
    await Hive.openBox<SCNRequest>('scn-requests');
  } catch (exc, trace) {
    Hive.deleteBoxFromDisk('scn-requests');
    await Hive.openBox<SCNRequest>('scn-requests');
    ApplicationLog.error('Failed to open Hive-Box: scn-requests: ' + exc.toString(), trace: trace);
  }

  print('[INIT] Load Hive<scn-message-cache>...');

  try {
    await Hive.openBox<SCNMessage>('scn-message-cache');
  } catch (exc, trace) {
    Hive.deleteBoxFromDisk('scn-message-cache');
    await Hive.openBox<SCNMessage>('scn-message-cache');
    ApplicationLog.error('Failed to open Hive-Box: scn-message-cache' + exc.toString(), trace: trace);
  }

  print('[INIT] Load Hive<scn-channel-cache>...');

  try {
    await Hive.openBox<Channel>('scn-channel-cache');
  } catch (exc, trace) {
    Hive.deleteBoxFromDisk('scn-channel-cache');
    await Hive.openBox<Channel>('scn-channel-cache');
    ApplicationLog.error('Failed to open Hive-Box: scn-channel-cache' + exc.toString(), trace: trace);
  }

  print('[INIT] Load Hive<scn-fb-messages>...');

  try {
    await Hive.openBox<FBMessage>('scn-fb-messages');
  } catch (exc, trace) {
    Hive.deleteBoxFromDisk('scn-fb-messages');
    await Hive.openBox<FBMessage>('scn-fb-messages');
    ApplicationLog.error('Failed to open Hive-Box: scn-fb-messages' + exc.toString(), trace: trace);
  }

  print('[INIT] Load AppAuth...');

  final appAuth = AppAuth(); // ensure UserAccount is loaded

  if (appAuth.isAuth()) {
    // load user+client in background
    () async {
      try {
        await appAuth.loadUser();
      } catch (exc, trace) {
        ApplicationLog.error('Failed to load user (background load on startup): ' + exc.toString(), trace: trace);
      }
      try {
        await appAuth.loadClient();
      } catch (exc, trace) {
        ApplicationLog.error('Failed to load user (background load on startup): ' + exc.toString(), trace: trace);
      }
    }();
  }

  if (!Platform.isLinux) {
    print('[INIT] Init Firebase...');
    await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);

    print('[INIT] Request Notification permissions...');
    await FirebaseMessaging.instance.requestPermission(provisional: true);

    FirebaseMessaging.instance.onTokenRefresh.listen((fcmToken) {
      try {
        setFirebaseToken(fcmToken);
      } catch (exc, trace) {
        ApplicationLog.error('Failed to set firebase token: ' + exc.toString(), trace: trace);
      }
    }).onError((dynamic err) {
      ApplicationLog.error('Failed to listen to token refresh events: ' + (err?.toString() ?? ''));
    });

    try {
      print('[INIT] Query firebase token...');
      final fcmToken = await FirebaseMessaging.instance.getToken();
      if (fcmToken != null) {
        setFirebaseToken(fcmToken);
      }
    } catch (exc, trace) {
      ApplicationLog.error('Failed to get+set firebase token: ' + exc.toString(), trace: trace);
    }

    FirebaseMessaging.onBackgroundMessage(_onBackgroundMessage);
    FirebaseMessaging.onMessage.listen(_onForegroundMessage);
  } else {
    print('[INIT] Skip Firebase init (Platform == Linux)...');
  }

  print('[INIT] Load Notifications...');

  final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
  final flutterLocalNotificationsPluginImpl = flutterLocalNotificationsPlugin.resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>();
  if (flutterLocalNotificationsPluginImpl == null) {
    ApplicationLog.error('Failed to get AndroidFlutterLocalNotificationsPlugin', trace: StackTrace.current);
  } else {
    flutterLocalNotificationsPluginImpl.requestNotificationsPermission();

    final initializationSettingsAndroid = AndroidInitializationSettings('ic_notification_white');
    final initializationSettingsDarwin = DarwinInitializationSettings(
      requestAlertPermission: true,
      requestBadgePermission: true,
      requestSoundPermission: true,
      onDidReceiveLocalNotification: _receiveLocalDarwinNotification,
      notificationCategories: getDarwinNotificationCategories(),
    );
    final initializationSettingsLinux = LinuxInitializationSettings(defaultActionName: 'Open notification');
    final initializationSettings = InitializationSettings(
      android: initializationSettingsAndroid,
      iOS: initializationSettingsDarwin,
      linux: initializationSettingsLinux,
    );
    flutterLocalNotificationsPlugin.initialize(
      initializationSettings,
      onDidReceiveNotificationResponse: _receiveLocalNotification,
      onDidReceiveBackgroundNotificationResponse: _notificationTapBackground,
    );

    final appLaunchNotification = await flutterLocalNotificationsPlugin.getNotificationAppLaunchDetails();
    if (appLaunchNotification != null) {
      // Use has launched SCN by clicking on a loca notifiaction, if it was a summary or message notifiaction open the corresponding screen
      // This is android only
      //TODO same on iOS, somehow??
      ApplicationLog.info('App launched by notification: ${appLaunchNotification.notificationResponse?.id}');

      _handleNotificationClickAction(appLaunchNotification.notificationResponse?.payload, Duration(milliseconds: 600));
    }
  }

  ApplicationLog.debug('[INIT] Application started');

  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (context) => AppAuth(), lazy: false),
        ChangeNotifierProvider(create: (context) => AppTheme(), lazy: false),
        ChangeNotifierProvider(create: (context) => AppBarState(), lazy: false),
        ChangeNotifierProvider(create: (context) => AppSettings(), lazy: false),
      ],
      child: SCNApp(),
    ),
  );
}

class SCNApp extends StatelessWidget {
  SCNApp({super.key});

  static var materialKey = GlobalKey<NavigatorState>();

  @override
  Widget build(BuildContext context) {
    return ToastificationWrapper(
      config: ToastificationConfig(
        itemWidth: 440,
        marginBuilder: (alignment) => EdgeInsets.symmetric(vertical: 64),
        animationDuration: Duration(milliseconds: 200),
      ),
      child: Consumer<AppTheme>(
        builder: (context, appTheme, child) => MaterialApp(
          navigatorKey: SCNApp.materialKey,
          title: 'SimpleCloudNotifier',
          navigatorObservers: [Navi.routeObserver, Navi.modalRouteObserver],
          theme: ThemeData(
            //TODO color settings
            colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue, brightness: appTheme.darkMode ? Brightness.dark : Brightness.light),
            useMaterial3: true,
          ),
          home: SCNNavLayout(),
        ),
      ),
    );
  }
}

@pragma('vm:entry-point')
void _notificationTapBackground(NotificationResponse notificationResponse) {
  // I think only iOS triggers this, TODO
  ApplicationLog.info('Received local notification<vm:entry-point>: ${notificationResponse.id}');
}

void setFirebaseToken(String fcmToken) async {
  final acc = AppAuth();

  final oldToken = Globals().getPrefFCMToken();

  await Globals().setPrefFCMToken(fcmToken);

  ApplicationLog.info('New firebase token received', additional: 'Token: $fcmToken (old: $oldToken)');

  if (!acc.isAuth()) return;

  Client? client;
  try {
    client = await acc.loadClient(forceIfOlder: Duration(seconds: 60));
  } catch (exc, trace) {
    ApplicationLog.error('Failed to get client: ' + exc.toString(), trace: trace);
    return;
  }

  if (oldToken != null && oldToken == fcmToken && client != null && client.fcmToken == fcmToken) {
    ApplicationLog.info('Firebase token unchanged - do nothing', additional: 'Token: $fcmToken');
    return;
  }

  if (client == null) {
    // should not really happen - perhaps someone externally deleted the client?
    final newClient = await APIClient.addClient(acc, fcmToken, Globals().deviceModel, Globals().version, Globals().hostname, Globals().clientType);
    acc.setClientAndClientID(newClient);
    await acc.save();
  } else {
    final newClient = await APIClient.updateClient(acc, client.clientID, fcmToken, Globals().deviceModel, Globals().hostname, Globals().version);
    acc.setClientAndClientID(newClient);
    await acc.save();
  }
}

@pragma('vm:entry-point')
Future<void> _onBackgroundMessage(RemoteMessage message) async {
  // a firebase message was received while the app was in the background or terminated
  await _receiveMessage(message, false);
}

@pragma('vm:entry-point')
void _onForegroundMessage(RemoteMessage message) {
  // a firebase message was received while the app was in the foreground
  _receiveMessage(message, true);
}

Future<void> _receiveMessage(RemoteMessage message, bool foreground) async {
  try {
    // ensure globals init
    if (!Globals().isInitialized) {
      print('[LATE-INIT] Init Globals() - to ensure working _receiveMessage($foreground)...');
      await Globals().init();
    }

    // ensure hive init
    if (!Hive.isBoxOpen('scn-logs')) {
      print('[LATE-INIT] Init Hive - to ensure working _receiveMessage($foreground)...');

      await Hive.initFlutter();
      Hive.registerAdapter(SCNRequestAdapter());
      Hive.registerAdapter(SCNLogAdapter());
      Hive.registerAdapter(SCNLogLevelAdapter());
      Hive.registerAdapter(SCNMessageAdapter());
      Hive.registerAdapter(ChannelAdapter());
      Hive.registerAdapter(FBMessageAdapter());
    }

    print('[LATE-INIT] Ensure hive boxes are open for _receiveMessage($foreground)...');

    await Hive.openBox<SCNLog>('scn-logs');
    await Hive.openBox<FBMessage>('scn-fb-messages');
    await Hive.openBox<SCNMessage>('scn-message-cache');
    await Hive.openBox<SCNRequest>('scn-requests');
  } catch (exc, trace) {
    ApplicationLog.error('Failed to init hive:' + exc.toString(), trace: trace);
    Notifier.showLocalNotification("", "@ERROR", "@ERROR", 'Error Channel', "Error", "Failed to receive SCN message (init failed)", null);
    return;
  }

  ApplicationLog.info('Received FB message (${foreground ? 'foreground' : 'background'}): ${message.messageId ?? 'NULL'}');

  String scn_msg_id;

  try {
    scn_msg_id = message.data['scn_msg_id'] as String;

    final timestamp = DateTime.fromMillisecondsSinceEpoch(int.parse(message.data['timestamp'] as String) * 1000);
    final title = message.data['title'] as String;
    final channel = message.data['channel'] as String;
    final channel_id = message.data['channel_id'] as String;
    final body = message.data['body'] as String;

    Notifier.showLocalNotification(scn_msg_id, channel_id, channel, 'Channel: ${channel}', title, body, timestamp);
  } catch (exc, trace) {
    ApplicationLog.error('Failed to decode received FB message' + exc.toString(), trace: trace);
    Notifier.showLocalNotification("", "@ERROR", "@ERROR", 'Error Channel', "Error", "Failed to receive SCN message (decode failed)", null);
    return;
  }

  try {
    FBMessageLog.insert(message);
  } catch (exc, trace) {
    ApplicationLog.error('Failed to persist received FB message' + exc.toString(), trace: trace);
    Notifier.showLocalNotification("", "@ERROR", "@ERROR", 'Error Channel', "Error", "Failed to receive SCN message (persist failed)", null);
    return;
  }

  try {
    final msg = await APIClient.getMessage(AppAuth(), scn_msg_id);
    SCNDataCache().addToMessageCache([msg]);
    if (foreground) AppEvents().notifyMessageReceivedListeners(msg);
  } catch (exc, trace) {
    ApplicationLog.error('Failed to query+persist message' + exc.toString(), trace: trace);
    return;
  }
}

void _receiveLocalDarwinNotification(int id, String? title, String? body, String? payload) {
  //TODO iOS?
  ApplicationLog.info('Received local notification<darwin>: $id -> [$title]');
}

void _receiveLocalNotification(NotificationResponse details) {
  // User has tapped a flutter_local notification, while the app was running
  ApplicationLog.info('Tapped local notification: [[${details.id} | ${details.actionId} | ${details.input} | ${details.notificationResponseType} | ${details.payload}]]');

  _handleNotificationClickAction(details.payload, Duration.zero);
}

void _handleNotificationClickAction(String? payload, Duration delay) {
  final parts = payload?.split('\n') ?? [];

  if (parts.length == 4 && parts[0] == '@SCN_MESSAGE') {
    final messageID = parts[1];
    () async {
      await Future.delayed(delay);

      SchedulerBinding.instance.addPostFrameCallback((_) {
        ApplicationLog.info('Handle notification action @SCN_MESSAGE --> ${messageID}');
        Navi.push(SCNApp.materialKey.currentContext!, () => MessageViewPage(messageID: messageID, preloadedData: null));
      });
    }();
  } else if (parts.length == 3 && parts[0] == '@SCN_MESSAGE_SUMMARY') {
    final channelID = parts[1];
    () async {
      await Future.delayed(delay);

      SchedulerBinding.instance.addPostFrameCallback((_) {
        ApplicationLog.info('Handle notification action @SCN_MESSAGE_SUMMARY --> ${channelID}');
        Navi.push(SCNApp.materialKey.currentContext!, () => ChannelViewPage(channelID: channelID, preloadedData: null, needsReload: null));
      });
    }();
  }
}

List<DarwinNotificationCategory> getDarwinNotificationCategories() {
  return <DarwinNotificationCategory>[
    //TODO ?!?
  ];
}