feat: Add repository/interactor for get label changes

lib/features/labels/domain/model/label_changes_result.dart

@@ -0,0 +1,26 @@
+import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/state.dart';
+import 'package:labels/model/label.dart';
+
+class LabelChangesResult with EquatableMixin {
+  final List<Label> createdLabels;
+  final List<Label> updatedLabels;
+  final List<Id> destroyedLabelIds;
+  final State? newState;
+
+  LabelChangesResult({
+    required this.createdLabels,
+    required this.updatedLabels,
+    required this.destroyedLabelIds,
+    required this.newState,
+  });
+
+  @override
+  List<Object?> get props => [
+    createdLabels,
+    updatedLabels,
+    destroyedLabelIds,
+    newState,
+  ];
+}

lib/features/labels/domain/repository/label_repository.dart

@@ -1,6 +1,9 @@
 import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/session/session.dart';
+import 'package:jmap_dart_client/jmap/core/state.dart';
 import 'package:labels/model/label.dart';
 import 'package:tmail_ui_user/features/labels/domain/model/edit_label_request.dart';
+import 'package:tmail_ui_user/features/labels/domain/model/label_changes_result.dart';
 
 abstract class LabelRepository {
   Future<List<Label>> getAllLabels(AccountId accountId);
@@ -10,4 +13,10 @@ abstract class LabelRepository {
   Future<Label> editLabel(AccountId accountId, EditLabelRequest labelRequest);
 
   Future<void> deleteLabel(AccountId accountId, Label label);
+
+  Future<LabelChangesResult> getLabelChanges(
+    Session session,
+    AccountId accountId,
+    State sinceState,
+  );
 }

lib/features/labels/domain/state/get_label_changes_state.dart

@@ -0,0 +1,18 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:tmail_ui_user/features/labels/domain/model/label_changes_result.dart';
+
+class GettingLabelChanges extends LoadingState {}
+
+class GetLabelChangesSuccess extends UIState {
+  final LabelChangesResult changesResult;
+
+  GetLabelChangesSuccess(this.changesResult);
+
+  @override
+  List<Object> get props => [changesResult];
+}
+
+class GetLabelChangesFailure extends FeatureFailure {
+  GetLabelChangesFailure(dynamic exception) : super(exception: exception);
+}

lib/features/labels/domain/usecases/get_label_changes_interactor.dart

@@ -0,0 +1,32 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart' hide State;
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/session/session.dart';
+import 'package:jmap_dart_client/jmap/core/state.dart';
+import 'package:tmail_ui_user/features/labels/domain/repository/label_repository.dart';
+import 'package:tmail_ui_user/features/labels/domain/state/get_label_changes_state.dart';
+
+class GetLabelChangesInteractor {
+  final LabelRepository _labelRepository;
+
+  GetLabelChangesInteractor(this._labelRepository);
+
+  Stream<Either<Failure, Success>> execute(
+    Session session,
+    AccountId accountId,
+    State sinceState,
+  ) async* {
+    try {
+      yield Right(GettingLabelChanges());
+      final changesResult = await _labelRepository.getLabelChanges(
+        session,
+        accountId,
+        sinceState,
+      );
+      yield Right(GetLabelChangesSuccess(changesResult));
+    } catch (e) {
+      yield Left(GetLabelChangesFailure(e));
+    }
+  }
+}