OpenContacts/lib/clients/notification_client.dart

import 'dart:convert';

import 'package:collection/collection.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart' as fln;
import 'package:recon/auxiliary.dart';
import 'package:recon/models/message.dart';
import 'package:recon/models/session.dart';

class NotificationChannel {
  final String id;
  final String name;
  final String description;

  const NotificationChannel({required this.name, required this.id, required this.description});
}

class NotificationClient {
  static const NotificationChannel _messageChannel = NotificationChannel(
    id: "messages",
    name: "Messages",
    description: "Messages received from your friends",
  );

  final fln.FlutterLocalNotificationsPlugin _notifier = fln.FlutterLocalNotificationsPlugin()
    ..initialize(const fln.InitializationSettings(
      android: fln.AndroidInitializationSettings("ic_notification"),
      iOS: fln.DarwinInitializationSettings(),
      macOS: fln.DarwinInitializationSettings(),
      linux: fln.LinuxInitializationSettings(defaultActionName: "Open ReCon"),
    ));

  Future<void> showUnreadMessagesNotification(Iterable<Message> messages) async {
    if (messages.isEmpty) return;

    final bySender = groupBy(messages, (p0) => p0.senderId);

    for (final entry in bySender.entries) {
      final uname = entry.key.stripUid();
      await _notifier.show(
        uname.hashCode,
        null,
        null,
        fln.NotificationDetails(
          android: fln.AndroidNotificationDetails(
            _messageChannel.id,
            _messageChannel.name,
            channelDescription: _messageChannel.description,
            importance: fln.Importance.high,
            priority: fln.Priority.max,
            actions: [], //TODO: Make clicking message notification open chat of specified user.
            styleInformation: fln.MessagingStyleInformation(
              fln.Person(
                name: uname,
                bot: false,
              ),
              groupConversation: false,
              messages: entry.value.map((message) {
                String content;
                switch (message.type) {
                  case MessageType.unknown:
                    content = "Unknown Message Type";
                    break;
                  case MessageType.text:
                    content = message.content;
                    break;
                  case MessageType.sound:
                    content = "Audio Message";
                    break;
                  case MessageType.sessionInvite:
                    try {
                      final session = Session.fromMap(jsonDecode(message.content));
                      content = "Session Invite to ${session.name}";
                    } catch (e) {
                      content = "Session Invite";
                    }
                    break;
                  case MessageType.object:
                    content = "Asset";
                    break;
                }
                return fln.Message(
                  content,
                  message.sendTime.toLocal(),
                  fln.Person(
                    name: uname,
                    bot: false,
                  ),
                );
              }).toList(),
            ),
          ),
        ),
      );
    }
  }
}