refactor(mobile): services and providers (#9232)

* refactor(mobile): services and provider

* providers

mobile/lib/providers/notification_permission.provider.dart

@@ -0,0 +1,46 @@
+import 'dart:io';
+
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:permission_handler/permission_handler.dart';
+
+class NotificationPermissionNotifier extends StateNotifier<PermissionStatus> {
+  NotificationPermissionNotifier()
+      : super(
+          Platform.isAndroid
+              ? PermissionStatus.granted
+              : PermissionStatus.restricted,
+        ) {
+    // Sets the initial state
+    getNotificationPermission().then((p) => state = p);
+  }
+
+  /// Requests the notification permission
+  /// Note: In Android, this is always granted
+  Future<PermissionStatus> requestNotificationPermission() async {
+    final permission = await Permission.notification.request();
+    state = permission;
+    return permission;
+  }
+
+  /// Whether the user has the permission or not
+  /// Note: In Android, this is always true
+  Future<bool> hasNotificationPermission() {
+    return Permission.notification.isGranted;
+  }
+
+  Future<PermissionStatus> getNotificationPermission() async {
+    final status = await Permission.notification.status;
+    state = status;
+    return status;
+  }
+
+  /// Either the permission was granted already or else ask for the permission
+  Future<bool> hasOrAskForNotificationPermission() {
+    return requestNotificationPermission().then((p) => p.isGranted);
+  }
+}
+
+final notificationPermissionProvider =
+    StateNotifierProvider<NotificationPermissionNotifier, PermissionStatus>(
+  (ref) => NotificationPermissionNotifier(),
+);