TF-32 Add domain layer of download attachment for android platform

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

@@ -1,6 +1,6 @@
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
-import 'package:model/email/read_actions.dart';
+import 'package:model/model.dart';
 import 'package:tmail_ui_user/features/composer/domain/model/email_request.dart';
 
 abstract class EmailRepository {
@@ -9,4 +9,11 @@ abstract class EmailRepository {
   Future<bool> sendEmail(AccountId accountId, EmailRequest emailRequest);
 
   Future<bool> markAsRead(AccountId accountId, EmailId emailId, ReadActions readAction);
+
+  Future<List<DownloadTaskId>> downloadAttachments(
+    List<Attachment> attachments,
+    AccountId accountId,
+    String baseDownloadUrl,
+    AccountRequest accountRequest
+  );
 }

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

@@ -0,0 +1,20 @@
+import 'package:core/core.dart';
+import 'package:model/model.dart';
+
+class DownloadAttachmentsSuccess extends UIState {
+  final List<DownloadTaskId> taskIds;
+
+  DownloadAttachmentsSuccess(this.taskIds);
+
+  @override
+  List<Object> get props => [taskIds];
+}
+
+class DownloadAttachmentsFailure extends FeatureFailure {
+  final exception;
+
+  DownloadAttachmentsFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

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

@@ -0,0 +1,38 @@
+import 'package:core/core.dart';
+import 'package:model/model.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:tmail_ui_user/features/email/domain/repository/email_repository.dart';
+import 'package:tmail_ui_user/features/email/domain/state/download_attachments_state.dart';
+import 'package:tmail_ui_user/features/login/domain/repository/credential_repository.dart';
+
+class DownloadAttachmentsInteractor {
+  final EmailRepository emailRepository;
+  final CredentialRepository credentialRepository;
+
+  DownloadAttachmentsInteractor(this.emailRepository, this.credentialRepository);
+
+  Future<Either<Failure, Success>> execute(
+      List<Attachment> attachments,
+      AccountId accountId,
+      String baseDownloadUrl
+  ) async {
+    try {
+      final taskIds = await Future.wait(
+          [credentialRepository.getUserName(), credentialRepository.getPassword()],
+          eagerError: true
+      ).then((List responses) async {
+        final accountRequest = AccountRequest(responses.first, responses.last);
+        return await emailRepository.downloadAttachments(
+            attachments,
+            accountId,
+            baseDownloadUrl,
+            accountRequest);
+      });
+
+      return Right<Failure, Success>(DownloadAttachmentsSuccess(taskIds));
+    } catch (e) {
+      return Left<Failure, Success>(DownloadAttachmentsFailure(e));
+    }
+  }
+}