TF-439 Implement get firebase subscription

lib/features/push_notification/domain/exceptions/fcm_exception.dart

@@ -4,4 +4,6 @@ class NotSupportFCMException implements Exception {}
 
 class NotFoundStateToRefreshException implements Exception {}
 
-class NotFoundEmailDeliveryStateException implements Exception {}
+class NotFoundEmailDeliveryStateException implements Exception {}
+
+class NotFoundFirebaseSubscriptionException implements Exception {}

lib/features/push_notification/domain/state/get_firebase_subscription_state.dart

@@ -0,0 +1,25 @@
+
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:fcm/model/firebase_subscription.dart';
+
+class GetFirebaseSubscriptionLoading extends UIState {}
+
+class GetFirebaseSubscriptionSuccess extends UIState {
+
+  final FirebaseSubscription firebaseSubscription;
+
+  GetFirebaseSubscriptionSuccess(this.firebaseSubscription);
+
+  @override
+  List<Object> get props => [firebaseSubscription];
+}
+
+class GetFirebaseSubscriptionFailure extends FeatureFailure {
+  final dynamic exception;
+
+  GetFirebaseSubscriptionFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

lib/features/push_notification/domain/usecases/get_firebase_subscription_interactor.dart

@@ -0,0 +1,23 @@
+
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart';
+import 'package:tmail_ui_user/features/push_notification/domain/repository/fcm_repository.dart';
+import 'package:tmail_ui_user/features/push_notification/domain/state/get_firebase_subscription_state.dart';
+
+class GetFirebaseSubscriptionInteractor {
+
+  final FCMRepository _fcmRepository;
+
+  GetFirebaseSubscriptionInteractor(this._fcmRepository);
+
+  Stream<Either<Failure, Success>> execute(String deviceId) async* {
+    try {
+      yield Right<Failure, Success>(GetFirebaseSubscriptionLoading());
+      final firebaseSubscription = await _fcmRepository.getFirebaseSubscriptionByDeviceId(deviceId);
+      yield Right<Failure, Success>(GetFirebaseSubscriptionSuccess(firebaseSubscription));
+    } catch (e) {
+      yield Left<Failure, Success>(GetFirebaseSubscriptionFailure(e));
+    }
+  }
+}