Add domain layer for GetEmailContent

lib/features/email/domain/extensions/email_extension.dart

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+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:model/email/email_content.dart';
+
+extension EmailExtension on Email {
+
+  EmailContent toEmailContent() {
+    return EmailContent(
+      id,
+      htmlBody: htmlBody,
+      attachments: attachments,
+      bodyValues: bodyValues
+    );
+  }
+}

lib/features/email/domain/extensions/presentation_email_extension.dart

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+import 'package:intl/intl.dart';
+import 'package:model/model.dart';
+import 'package:core/core.dart';
+
+extension PresentationEmailExtension on PresentationEmail {
+
+  String getTimeSentEmail(String locale) {
+    if (sentAt != null) {
+      if (sentAt!.value.isToday()) {
+        return DateFormat('h:mm a', locale).format(sentAt!.value);
+      } else if (sentAt!.value.isYesterday()) {
+        return DateFormat('EEE', locale).format(sentAt!.value);
+      } else if (sentAt!.value.isThisYear()) {
+        return DateFormat('MMMd', locale).format(sentAt!.value);
+      } else {
+        return DateFormat('yMMMd', locale).format(sentAt!.value);
+      }
+    } else {
+      return '';
+    }
+  }
+}

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

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+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+
+abstract class EmailRepository {
+  Future<Email> getEmailContent(AccountId accountId, EmailId emailId);
+}

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

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+import 'package:core/core.dart';
+import 'package:model/email/email_content.dart';
+
+class GetEmailContentSuccess extends UIState {
+  final EmailContent? emailContent;
+
+  GetEmailContentSuccess(this.emailContent);
+
+  @override
+  List<Object?> get props => [emailContent];
+}
+
+class GetEmailContentFailure extends FeatureFailure {
+  final exception;
+
+  GetEmailContentFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

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

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+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:tmail_ui_user/features/email/domain/repository/email_repository.dart';
+import 'package:tmail_ui_user/features/email/domain/state/get_email_content_state.dart';
+import 'package:tmail_ui_user/features/email/domain/extensions/email_extension.dart';
+
+class GetEmailContentInteractor {
+  final EmailRepository emailRepository;
+
+  GetEmailContentInteractor(this.emailRepository);
+
+  Stream<Either<Failure, Success>> execute(AccountId accountId, EmailId emailId) async* {
+    try {
+      yield Right<Failure, Success>(UIState.loading);
+      final email = await emailRepository.getEmailContent(accountId, emailId);
+      yield Right<Failure, Success>(GetEmailContentSuccess(email.toEmailContent()));
+    } catch (e) {
+      yield Left(GetEmailContentFailure(e));
+    }
+  }
+}