feat(crm): align shared attachment payloads

internal/service/contact_service.go

@@ -1230,3 +1230,35 @@ func (s *ContactService) GetContactableInboxes(ctx context.Context, accountID, c
 
 	return result, nil
 }
+
+// ListAttachments returns a contact's message attachments across account-scoped conversations.
+// Reference: Chatwoot Api::V1::Accounts::Contacts::AttachmentsController#index.
+func (s *ContactService) ListAttachments(ctx context.Context, accountID, contactID uint, offset, limit int) ([]model.Attachment, int64, error) {
+	if _, err := s.repo.FindByAccountAndID(ctx, accountID, contactID); err != nil {
+		return nil, 0, errors.New("contact not found")
+	}
+
+	if limit <= 0 {
+		limit = 100
+	}
+	db := s.repo.DB()
+	scope := db.WithContext(ctx).
+		Where("account_id = ? AND message_id IN (SELECT messages.id FROM messages JOIN conversations ON conversations.id = messages.conversation_id WHERE conversations.account_id = ? AND conversations.contact_id = ?)", accountID, accountID, contactID)
+
+	var total int64
+	if err := scope.Model(&model.Attachment{}).Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	var attachments []model.Attachment
+	if err := scope.
+		Preload("Message").
+		Order("created_at DESC, id DESC").
+		Offset(offset).
+		Limit(limit).
+		Find(&attachments).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return attachments, total, nil
+}

internal/service/message_service.go

@@ -529,23 +529,22 @@ func (s *MessageService) ListAttachments(ctx context.Context, accountID, convers
 	var total int64
 
 	db := s.repo.DB()
-	err := db.WithContext(ctx).
-		Where("account_id = ? AND message_id IN (SELECT id FROM messages WHERE conversation_id = ?)", accountID, conversationID).
-		Order("id ASC").
-		Find(&attachments).Error
-	if err != nil {
+	scope := db.WithContext(ctx).
+		Where("account_id = ? AND message_id IN (SELECT id FROM messages WHERE conversation_id = ?)", accountID, conversationID)
+	if err := scope.Model(&model.Attachment{}).Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+	if limit <= 0 {
+		limit = 100
+	}
+	if err := scope.
+		Preload("Message").
+		Order("created_at DESC, id DESC").
+		Offset(offset).
+		Limit(limit).
+		Find(&attachments).Error; err != nil {
 		return nil, 0, err
 	}
 
-	total = int64(len(attachments))
-	start := offset
-	if start > len(attachments) {
-		start = len(attachments)
-	}
-	end := start + limit
-	if end > len(attachments) {
-		end = len(attachments)
-	}
-
-	return attachments[start:end], total, nil
+	return attachments, total, nil
 }