import 'package:provider/provider.dart';
import 'package:twonly/globals.dart';
import 'package:twonly/src/components/connection_state.dart';
import 'package:twonly/src/providers/settings_change_provider.dart';
import 'package:twonly/src/utils/storage.dart';
import 'package:twonly/src/views/onboarding/onboarding_view.dart';
import 'package:twonly/src/views/home_view.dart';
import 'package:twonly/src/views/onboarding/register_view.dart';
import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'dart:async';

// these global function can be called from anywhere to update
// the ui when something changed. The callbacks will be set by
// MyApp widget.

// this callback is called by the apiProvider
Function(bool) globalCallbackConnectionState = (a) {};
bool globalIsAppInBackground = true;

// these two callbacks are called on updated to the corresponding database

/// The Widget that configures your application.
class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
  bool _isConnected = false;
  bool wasPaused = false;

  @override
  void initState() {
    super.initState();
    globalIsAppInBackground = false;
    WidgetsBinding.instance.addObserver(this);

    // register global callbacks to the widget tree
    globalCallbackConnectionState = (isConnected) {
      setState(() {
        _isConnected = isConnected;
      });
    };

    // WidgetsBinding.instance.addPostFrameCallback((_) {
    //   _requestPermissions();
    //   _initService();
    // });
    initAsync();
  }

  Future initAsync() async {
    // make sure the front end service will be killed
    // FlutterForegroundTask.sendDataToTask("");
    // await FlutterForegroundTask.stopService();
    // connect async to the backend api
    apiProvider.connect();
  }

  // Future<void> _requestPermissions() async {
  //   // Android 13+, you need to allow notification permission to display foreground service notification.
  //   //
  //   // iOS: If you need notification, ask for permission.
  //   final NotificationPermission notificationPermission =
  //       await FlutterForegroundTask.checkNotificationPermission();
  //   if (notificationPermission != NotificationPermission.granted) {
  //     await FlutterForegroundTask.requestNotificationPermission();
  //   }

  //   if (Platform.isAndroid) {
  //     // Android 12+, there are restrictions on starting a foreground service.
  //     //
  //     // To restart the service on device reboot or unexpected problem, you need to allow below permission.
  //     if (!await FlutterForegroundTask.isIgnoringBatteryOptimizations) {
  //       // This function requires `android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS` permission.
  //       await FlutterForegroundTask.requestIgnoreBatteryOptimization();
  //     }

  //     // Use this utility only if you provide services that require long-term survival,
  //     // such as exact alarm service, healthcare service, or Bluetooth communication.
  //     //
  //     // This utility requires the "android.permission.SCHEDULE_EXACT_ALARM" permission.
  //     // Using this permission may make app distribution difficult due to Google policy.
  //     // if (!await FlutterForegroundTask.canScheduleExactAlarms) {
  //     // When you call this function, will be gone to the settings page.
  //     // So you need to explain to the user why set it.
  //     // await FlutterForegroundTask.openAlarmsAndRemindersSettings();
  //     // }
  //   }
  // }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    if (state == AppLifecycleState.resumed) {
      if (wasPaused) {
        globalIsAppInBackground = false;
        apiProvider.connect();
        // _stopService();
      }
    } else if (state == AppLifecycleState.paused) {
      wasPaused = true;
      globalIsAppInBackground = true;

      // apiProvider.close(() {
      // use this only when uploading an image
      // _startService();
      // });
    }
  }

  @override
  void dispose() {
    // apiProvider.close(() {});
    WidgetsBinding.instance.removeObserver(this);
    // disable globalCallbacks to the flutter tree
    globalCallbackConnectionState = (a) {};
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // var isConnected = context.watch<ApiProvider>().isConnected;
    // Glue the SettingsController to the MaterialApp.
    //
    // The ListenableBuilder Widget listens to the SettingsController for changes.
    // Whenever the user updates their settings, the MaterialApp is rebuilt.
    return ListenableBuilder(
      listenable: context.watch<SettingsChangeProvider>(),
      builder: (BuildContext context, Widget? child) {
        return MaterialApp(
          restorationScopeId: 'app',
          localizationsDelegates: const [
            AppLocalizations.delegate,
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
            GlobalCupertinoLocalizations.delegate,
          ],
          supportedLocales: const [
            Locale('en', ''),
            Locale('de', ''),
          ],
          onGenerateTitle: (BuildContext context) => "twonly",
          theme: ThemeData(
              colorScheme:
                  ColorScheme.fromSeed(seedColor: const Color(0xFF57CC99)),
              inputDecorationTheme:
                  const InputDecorationTheme(border: OutlineInputBorder())),
          darkTheme: ThemeData.dark().copyWith(
            colorScheme: ColorScheme.fromSeed(
              brightness: Brightness.dark, // <-- the only line added
              seedColor: const Color(0xFF57CC99),
            ),
            inputDecorationTheme: const InputDecorationTheme(
              border: OutlineInputBorder(),
            ),
          ),
          themeMode: context.watch<SettingsChangeProvider>().themeMode,
          initialRoute: '/',
          routes: {
            "/": (context) =>
                MyAppMainWidget(isConnected: _isConnected, initialPage: 0),
            "/chats": (context) =>
                MyAppMainWidget(isConnected: _isConnected, initialPage: 1)
            // home: MyAppMainWidget(isConnected: _isConnected, initialPage: 0),
          },
        );
      },
    );
  }
}

class MyAppMainWidget extends StatefulWidget {
  const MyAppMainWidget(
      {super.key, required this.isConnected, required this.initialPage});

  final bool isConnected;
  final int initialPage;

  @override
  State<MyAppMainWidget> createState() => _MyAppMainWidgetState();
}

class _MyAppMainWidgetState extends State<MyAppMainWidget> {
  Future<bool> _isUserCreated = isUserCreated();
  bool _showOnboarding = true;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        FutureBuilder<bool>(
          future: _isUserCreated,
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              if (snapshot.data!) {
                return HomeView(initialPage: widget.initialPage);
              }

              if (_showOnboarding) {
                return OnboardingView(
                  callbackOnSuccess: () {
                    setState(() {
                      _showOnboarding = false;
                    });
                  },
                );
              }

              return RegisterView(
                callbackOnSuccess: () {
                  setState(() {
                    _isUserCreated = isUserCreated();
                  });
                },
              );
            } else {
              return Center(child: Container());
            }
          },
        ),
        if (!widget.isConnected) ConnectionInfo()
      ],
    );
  }
}