TF-4404 Fix missing subject when perform Mail to attendees action in event email

lib/features/composer/presentation/extensions/email_action_type_extension.dart

@@ -7,12 +7,10 @@ import 'package:model/email/email_action_type.dart';
 import 'package:model/email/presentation_email.dart';
 import 'package:model/extensions/list_email_address_extension.dart';
 import 'package:model/extensions/utc_date_extension.dart';
+import 'package:tmail_ui_user/features/email/presentation/utils/email_utils.dart';
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
 
 extension EmailActionTypeExtension on EmailActionType {
-  static const String _defaultReplyPrefix = 'Re:';
-  static const String _defaultForwardPrefix = 'Fwd:';
-
   String getSubjectComposer(BuildContext? context, String subject) {
     final l10n = context != null ? AppLocalizations.of(context) : null;
 
@@ -20,15 +18,15 @@ extension EmailActionTypeExtension on EmailActionType {
       case EmailActionType.reply:
       case EmailActionType.replyToList:
       case EmailActionType.replyAll:
-        return _applyPrefix(
+        return EmailUtils.applyPrefix(
           subject: subject,
-          defaultPrefix: _defaultReplyPrefix,
+          defaultPrefix: EmailUtils.defaultReplyPrefix,
           localizedPrefix: l10n?.prefix_reply_email,
         );
       case EmailActionType.forward:
-        return _applyPrefix(
+        return EmailUtils.applyPrefix(
           subject: subject,
-          defaultPrefix: _defaultForwardPrefix,
+          defaultPrefix: EmailUtils.defaultForwardPrefix,
           localizedPrefix: l10n?.prefix_forward_email,
         );
       case EmailActionType.editDraft:
@@ -43,29 +41,6 @@ extension EmailActionTypeExtension on EmailActionType {
     }
   }
 
-  String _applyPrefix({
-    required String subject,
-    required String defaultPrefix,
-    String? localizedPrefix,
-  }) {
-    final trimmed = subject.trim();
-    final lowerSubject = trimmed.toLowerCase();
-
-    final prefixes = <String>[
-      defaultPrefix.toLowerCase(),
-      if (localizedPrefix != null) localizedPrefix.toLowerCase(),
-    ];
-
-    final hasPrefix = prefixes.any(lowerSubject.startsWith);
-
-    if (hasPrefix) {
-      return subject;
-    }
-
-    final prefix = localizedPrefix ?? defaultPrefix;
-    return '$prefix $subject';
-  }
-
   String getToastMessageMoveToMailboxSuccess(BuildContext context, {String? destinationPath}) {
     switch(this) {
       case EmailActionType.archiveMessage:

lib/features/email/presentation/controller/single_email_controller.dart

@@ -1499,7 +1499,11 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     );
   }
 
-  void handleMailToAttendees(CalendarOrganizer? organizer, List<CalendarAttendee>? attendees) {
+  void handleMailToAttendees(
+    CalendarOrganizer? organizer,
+    List<CalendarAttendee>? attendees,
+    String? eventTitle,
+  ) {
     List<EmailAddress> listEmailAddressAttendees = [];
 
     if (organizer != null) {
@@ -1516,7 +1520,10 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
         listEmailAddressAttendees.removeInvalidEmails(ownEmailAddress);
     log('SingleEmailController::handleMailToAttendees: listEmailAddressMailTo = $listEmailAddressMailTo');
     mailboxDashBoardController.openComposer(
-      ComposerArguments.fromMailtoUri(listEmailAddress: listEmailAddressMailTo)
+      ComposerArguments.fromMailtoUri(
+        listEmailAddress: listEmailAddressMailTo,
+        subject: eventTitle,
+      )
     );
   }
 

lib/features/email/presentation/extensions/calendar_event_extension.dart

@@ -21,6 +21,7 @@ import 'package:jmap_dart_client/jmap/mail/calendar/properties/event_id.dart';
 import 'package:jmap_dart_client/jmap/mail/calendar/properties/event_method.dart';
 import 'package:jmap_dart_client/jmap/mail/calendar/properties/recurrence_rule/recurrence_rule.dart';
 import 'package:tmail_ui_user/features/email/domain/model/event_action.dart';
+import 'package:tmail_ui_user/features/email/presentation/utils/email_utils.dart';
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
 import 'package:tmail_ui_user/main/utils/app_utils.dart';
 
@@ -495,4 +496,12 @@ extension CalendarEventExtension on CalendarEvent {
       excludedCalendarEvents: excludedCalendarEvents ?? this.excludedCalendarEvents,
     );
   }
+
+  String getMailToAttendeesEventTitle(AppLocalizations appLocalizations) {
+    return EmailUtils.applyPrefix(
+      subject: title ?? '',
+      defaultPrefix: EmailUtils.defaultReplyPrefix,
+      localizedPrefix: appLocalizations.prefix_reply_email,
+    );
+  }
 }

lib/features/email/presentation/utils/email_utils.dart

@@ -29,9 +29,34 @@ class EmailUtils {
   static const double attachmentItemHeight = 36;
   static const double attachmentIcon = 20;
   static const int maxMobileVisibleAttachments = 3;
+  static const String defaultReplyPrefix = 'Re:';
+  static const String defaultForwardPrefix = 'Fwd:';
 
   EmailUtils._();
 
+  static String applyPrefix({
+    required String subject,
+    required String defaultPrefix,
+    String? localizedPrefix,
+  }) {
+    final trimmed = subject.trim();
+    final lowerSubject = trimmed.toLowerCase();
+
+    final prefixes = <String>[
+      defaultPrefix.toLowerCase(),
+      if (localizedPrefix != null) localizedPrefix.toLowerCase(),
+    ];
+
+    final hasPrefix = prefixes.any(lowerSubject.startsWith);
+
+    if (hasPrefix) {
+      return subject;
+    }
+
+    final prefix = localizedPrefix ?? defaultPrefix;
+    return '$prefix $subject';
+  }
+
   static Properties getPropertiesForEmailGetMethod(Session session, AccountId accountId) {
     if (CapabilityIdentifier.jamesCalendarEvent.isSupported(session, accountId)) {
       return ThreadConstants.propertiesCalendarEvent;

lib/features/email/presentation/widgets/calendar_event/calendar_event_detail_widget.dart

@@ -10,7 +10,11 @@ import 'package:tmail_ui_user/features/email/presentation/styles/calendar_event_
 import 'package:tmail_ui_user/features/email/presentation/widgets/calendar_event/event_body_content_widget.dart';
 import 'package:tmail_ui_user/features/email/presentation/widgets/calendar_event/event_title_widget.dart';
 
-typedef OnMailtoAttendeesAction = Function(CalendarOrganizer? organizer, List<CalendarAttendee>? participants);
+typedef OnMailtoAttendeesAction = Function(
+  CalendarOrganizer? organizer,
+  List<CalendarAttendee>? participants,
+  String? eventTitle,
+);
 
 class CalendarEventDetailWidget extends StatelessWidget {
 

lib/features/email/presentation/widgets/calendar_event/calendar_event_information_widget.dart

@@ -185,6 +185,9 @@ class CalendarEventInformationWidget extends StatelessWidget {
               onMailToAttendeesAction: () => onMailtoAttendeesAction?.call(
                 calendarEvent.organizer,
                 calendarEvent.participants,
+                calendarEvent.getMailToAttendeesEventTitle(
+                  AppLocalizations.of(context),
+                ),
               ),
             ),
         ],