send notification to mention user

internal/service/letter_service.go

@@ -510,7 +510,6 @@ func (s *LetterServiceImpl) CreateDiscussion(ctx context.Context, letterID uuid.
 		
 		// Log activity for discussion creation
 		if s.activityLogger != nil && result != nil {
-			// Create a simple activity log
 			if err := s.activityLogger.LogLetterDispositionStatusUpdate(txCtx, letterID, userID, "discussion_created"); err != nil {
 				// Don't fail the transaction for logging errors
 			}
@@ -523,6 +522,11 @@ func (s *LetterServiceImpl) CreateDiscussion(ctx context.Context, letterID uuid.
 		return nil, err
 	}
 	
+	// Send notifications to mentioned users asynchronously
+	if s.notificationProcessor != nil && req.Mentions != nil {
+		go s.sendDiscussionMentionNotifications(context.Background(), letterID, userID, req.Mentions, req.Message)
+	}
+	
 	return result, nil
 }
 
@@ -590,3 +594,68 @@ func (s *LetterServiceImpl) BulkArchiveIncomingLetters(ctx context.Context, lett
 		ArchivedCount: int(archivedCount),
 	}, nil
 }
+
+func (s *LetterServiceImpl) sendDiscussionMentionNotifications(ctx context.Context, letterID uuid.UUID, senderUserID uuid.UUID, mentions map[string]interface{}, message string) {
+	// Extract user_ids from mentions
+	userIDs := s.extractUserIDsFromMentions(mentions)
+	if len(userIDs) == 0 {
+		return
+	}
+	
+	// Get letter details for notification
+	letter, err := s.processor.GetIncomingLetterByID(ctx, letterID)
+	if err != nil {
+		return
+	}
+	
+	// Get sender user name (you might need to implement this)
+	appContext := appcontext.FromGinContext(ctx)
+	senderName := appContext.UserName // or get from user service
+	
+	// Send notification to each mentioned user
+	for _, mentionedUserID := range userIDs {
+		// Don't send notification to the sender themselves
+		if mentionedUserID == senderUserID {
+			continue
+		}
+		
+		subject := "Anda Disebutkan dalam Diskusi"
+		notificationMessage := fmt.Sprintf("%s menyebutkan Anda dalam diskusi surat: %s", senderName, letter.Subject)
+		
+		err := s.notificationProcessor.SendIncomingLetterNotification(
+			ctx,
+			letterID,
+			mentionedUserID,
+			subject,
+			notificationMessage)
+		
+		if err != nil {
+			// Log error but continue with other notifications
+		}
+	}
+}
+
+func (s *LetterServiceImpl) extractUserIDsFromMentions(mentions map[string]interface{}) []uuid.UUID {
+	userIDs := make([]uuid.UUID, 0)
+	
+	if userIDsInterface, exists := mentions["user_ids"]; exists {
+		switch userIDsValue := userIDsInterface.(type) {
+		case []interface{}:
+			for _, userIDInterface := range userIDsValue {
+				if userIDStr, ok := userIDInterface.(string); ok {
+					if userID, err := uuid.Parse(userIDStr); err == nil {
+						userIDs = append(userIDs, userID)
+					}
+				}
+			}
+		case []string:
+			for _, userIDStr := range userIDsValue {
+				if userID, err := uuid.Parse(userIDStr); err == nil {
+					userIDs = append(userIDs, userID)
+				}
+			}
+		}
+	}
+	
+	return userIDs
+}