together_mobile/lib/use_notification.dart

import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_timezone/flutter_timezone.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:timezone/timezone.dart' as tz;
import 'package:timezone/data/latest_all.dart' as tz;
import 'package:together_mobile/notification_api.dart';

Future<void> main() async {
  // needed if you intend to initialize in `main` function
  WidgetsFlutterBinding.ensureInitialized();

  final NotificationAppLaunchDetails? notificationAppLaunchDetails = !kIsWeb &&
          Platform.isLinux
      ? null
      : await flutterLocalNotificationsPlugin.getNotificationAppLaunchDetails();

  const AndroidInitializationSettings initializationSettingsAndroid =
      AndroidInitializationSettings('app_icon');

  final List<DarwinNotificationCategory> darwinNotificationCategories = [
    DarwinNotificationCategory(
      darwinNotificationCategoryText,
      actions: [
        DarwinNotificationAction.text(
          'text_1',
          'Action 1',
          buttonTitle: 'Send',
          placeholder: 'Placeholder',
        ),
      ],
    ),
    DarwinNotificationCategory(
      darwinNotificationCategoryPlain,
      actions: <DarwinNotificationAction>[
        DarwinNotificationAction.plain('id_1', 'Action 1'),
        DarwinNotificationAction.plain(
          'id_2',
          'Action 2 (destructive)',
          options: <DarwinNotificationActionOption>{
            DarwinNotificationActionOption.destructive,
          },
        ),
        DarwinNotificationAction.plain(
          navigationActionId,
          'Action 3 (foreground)',
          options: <DarwinNotificationActionOption>{
            DarwinNotificationActionOption.foreground,
          },
        ),
        DarwinNotificationAction.plain(
          'id_4',
          'Action 4 (auth required)',
          options: <DarwinNotificationActionOption>{
            DarwinNotificationActionOption.authenticationRequired,
          },
        ),
      ],
      options: <DarwinNotificationCategoryOption>{
        DarwinNotificationCategoryOption.hiddenPreviewShowTitle,
      },
    ),
  ];

  final DarwinInitializationSettings initializationSettingsDarwin =
      DarwinInitializationSettings(
    requestAlertPermission: false,
    requestBadgePermission: false,
    requestSoundPermission: false,
    onDidReceiveLocalNotification: (id, title, body, payload) async {
      didReceiveLocalNotificationStream.add(
        ReceivedNotification(
          id: id,
          title: title,
          body: body,
          payload: payload,
        ),
      );
    },
    notificationCategories: darwinNotificationCategories,
  );

  final LinuxInitializationSettings initializationSettingsLinux =
      LinuxInitializationSettings(
    defaultActionName: 'Open notification',
    defaultIcon: AssetsLinuxIcon('icons/app_icon.png'),
  );

  final InitializationSettings initializationSettings = InitializationSettings(
    android: initializationSettingsAndroid,
    iOS: initializationSettingsDarwin,
    macOS: initializationSettingsDarwin,
    linux: initializationSettingsLinux,
  );

  await flutterLocalNotificationsPlugin.initialize(
    initializationSettings,
    onDidReceiveNotificationResponse:
        (NotificationResponse notificationResponse) {
      switch (notificationResponse.notificationResponseType) {
        case NotificationResponseType.selectedNotification:
          selectNotificationStream.add(notificationResponse.payload);
          break;
        case NotificationResponseType.selectedNotificationAction:
          if (notificationResponse.actionId == navigationActionId) {
            selectNotificationStream.add(notificationResponse.payload);
          }
          break;
      }
    },
    onDidReceiveBackgroundNotificationResponse: notificationTapBackground,
  );

  String initialRoute = HomePage.routeName;

  runApp(
    MaterialApp(
      initialRoute: initialRoute,
      routes: <String, WidgetBuilder>{
        HomePage.routeName: (_) => HomePage(notificationAppLaunchDetails),
        SecondPage.routeName: (_) => SecondPage(selectedNotificationPayload),
      },
    ),
  );
}

Future<void> _configureLocalTimeZone() async {
  if (kIsWeb || Platform.isLinux) {
    return;
  }
  tz.initializeTimeZones();
  final String timeZoneName = await FlutterTimezone.getLocalTimezone();
  tz.setLocalLocation(tz.getLocation(timeZoneName));
}

class PaddedElevatedButton extends StatelessWidget {
  const PaddedElevatedButton({
    required this.buttonText,
    required this.onPressed,
    Key? key,
  }) : super(key: key);

  final String buttonText;
  final VoidCallback onPressed;

  @override
  Widget build(BuildContext context) => Padding(
        padding: const EdgeInsets.fromLTRB(0, 0, 0, 8),
        child: ElevatedButton(
          onPressed: onPressed,
          child: Text(buttonText),
        ),
      );
}

class HomePage extends StatefulWidget {
  const HomePage(this.notificationAppLaunchDetails, {Key? key})
      : super(key: key);

  static String routeName = '/';

  final NotificationAppLaunchDetails? notificationAppLaunchDetails;

  bool get didNotificationLaunchApp =>
      notificationAppLaunchDetails?.didNotificationLaunchApp ?? false;

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  bool _notificationsEnabled = false;

  @override
  void initState() {
    super.initState();
    _isAndroidPermissionGranted();
    _requestPermissions();
    _configureDidReceivelocalNotificationSubject();
    _configureSelectNotificationSubject();
  }

  Future<void> _isAndroidPermissionGranted() async {
    if (Platform.isAndroid) {
      final bool granted = await flutterLocalNotificationsPlugin
              .resolvePlatformSpecificImplementation<
                  AndroidFlutterLocalNotificationsPlugin>()
              ?.areNotificationsEnabled() ??
          false;

      setState(() {
        _notificationsEnabled = granted;
      });
    }
  }

  Future<void> _requestPermissions() async {
    if (Platform.isIOS || Platform.isMacOS) {
      await flutterLocalNotificationsPlugin
          .resolvePlatformSpecificImplementation<
              IOSFlutterLocalNotificationsPlugin>()
          ?.requestPermissions(
            alert: true,
            badge: true,
            sound: true,
          );

      await flutterLocalNotificationsPlugin
          .resolvePlatformSpecificImplementation<
              MacOSFlutterLocalNotificationsPlugin>()
          ?.requestPermissions(
            alert: true,
            badge: true,
            sound: true,
          );
    } else if (Platform.isAndroid) {
      final AndroidFlutterLocalNotificationsPlugin? androidImplementation =
          flutterLocalNotificationsPlugin.resolvePlatformSpecificImplementation<
              AndroidFlutterLocalNotificationsPlugin>();

      final bool? granted = await androidImplementation?.requestPermission();

      setState(() {
        _notificationsEnabled = granted ?? false;
      });
    }
  }

  void _configureDidReceiveLocalNotificationSubject() {
    didReceiveLocalNotificationStream.stream
        .listen((ReceivedNotification receivedNotification) async {
      await showDialog(
        context: context,
        builder: (BuildContext context) => CupertinoAlertDialog(
          title: receivedNotification.title != null
              ? Text(receivedNotification.title!)
              : null,
          content: receivedNotification.body != null
              ? Text(receivedNotification.body!)
              : null,
          actions: <Widget>[
            CupertinoDialogAction(
              isDefaultAction: true,
              onPressed: () async {
                Navigator.of(context, rootNavigator: true).pop();
                await Navigator.of(context).push(
                  MaterialPageRoute<void>(
                    builder: (BuildContext context) =>
                        SecondPage(receivedNotification.payload),
                  ),
                );
              },
              child: const Text('Ok'),
            )
          ],
        ),
      );
    });
  }


  @override
  Widget build(BuildContext context) {
    return const Placeholder();
  }
}