TF-4195 Add Label to Thread

lib/features/email/domain/repository/email_repository.dart

@@ -168,4 +168,11 @@ abstract class EmailRepository {
     EmailId emailId,
     KeyWordIdentifier labelKeyword,
   );
+
+  Future<void> addLabelToThread(
+    Session session,
+    AccountId accountId,
+    List<EmailId> emailIds,
+    KeyWordIdentifier labelKeyword,
+  );
 }

lib/features/email/domain/state/add_a_label_to_an_thread_state.dart

@@ -0,0 +1,29 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
+
+class AddingALabelToAThread extends LoadingState {}
+
+class AddALabelToAThreadSuccess extends UIState {
+  final List<EmailId> emailIds;
+  final KeyWordIdentifier labelKeyword;
+  final String labelDisplay;
+
+  AddALabelToAThreadSuccess(this.emailIds, this.labelKeyword, this.labelDisplay);
+
+  @override
+  List<Object> get props => [emailIds, labelKeyword, labelDisplay];
+}
+
+class AddALabelToAThreadFailure extends FeatureFailure {
+  final String labelDisplay;
+
+  AddALabelToAThreadFailure({
+    dynamic exception,
+    required this.labelDisplay,
+  }) : super(exception: exception);
+
+  @override
+  List<Object?> get props => [...super.props, labelDisplay];
+}

lib/features/email/domain/usecases/add_a_label_to_a_thread_interactor.dart

@@ -0,0 +1,43 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart';
+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/mail/email/email.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
+import 'package:tmail_ui_user/features/email/domain/repository/email_repository.dart';
+import 'package:tmail_ui_user/features/email/domain/state/add_a_label_to_an_thread_state.dart';
+
+class AddALabelToAThreadInteractor {
+  final EmailRepository _emailRepository;
+
+  AddALabelToAThreadInteractor(this._emailRepository);
+
+  Stream<Either<Failure, Success>> execute(
+    Session session,
+    AccountId accountId,
+    List<EmailId> emailIds,
+    KeyWordIdentifier labelKeyword,
+    String labelDisplay,
+  ) async* {
+    try {
+      yield Right(AddingALabelToAThread());
+      await _emailRepository.addLabelToThread(
+        session,
+        accountId,
+        emailIds,
+        labelKeyword,
+      );
+      yield Right(AddALabelToAThreadSuccess(
+        emailIds,
+        labelKeyword,
+        labelDisplay,
+      ));
+    } catch (e) {
+      yield Left(AddALabelToAThreadFailure(
+        exception: e,
+        labelDisplay: labelDisplay,
+      ));
+    }
+  }
+}