feat(conversations): finish message mutation parity

internal/repository/message_repo.go

@@ -51,6 +51,49 @@ func (r *MessageRepo) FindByConversation(ctx context.Context, conversationID uin
 	return messages, total, err
 }
 
+// FindByConversationFinder mirrors Chatwoot's MessageFinder before/after windows.
+func (r *MessageRepo) FindByConversationFinder(ctx context.Context, conversationID uint, after, before uint, filterInternal bool) ([]model.Message, int64, error) {
+	query := r.db.WithContext(ctx).Model(&model.Message{}).Where("conversation_id = ?", conversationID)
+	if filterInternal {
+		query = query.Where("NOT (private = ? OR message_type = ?)", true, model.MessageTypeActivity)
+	}
+
+	var total int64
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	var messages []model.Message
+	switch {
+	case after != 0 && before != 0:
+		err := query.Where("id >= ? AND id < ?", after, before).Order("created_at ASC, id ASC").Limit(1000).Find(&messages).Error
+		return messages, total, err
+	case before != 0:
+		err := query.Where("id < ?", before).Order("created_at DESC, id DESC").Limit(20).Find(&messages).Error
+		if err != nil {
+			return nil, 0, err
+		}
+		reverseMessages(messages)
+		return messages, total, nil
+	case after != 0:
+		err := query.Where("id > ?", after).Order("created_at ASC, id ASC").Limit(100).Find(&messages).Error
+		return messages, total, err
+	default:
+		err := query.Order("created_at DESC, id DESC").Limit(20).Find(&messages).Error
+		if err != nil {
+			return nil, 0, err
+		}
+		reverseMessages(messages)
+		return messages, total, nil
+	}
+}
+
+func reverseMessages(messages []model.Message) {
+	for i, j := 0, len(messages)-1; i < j; i, j = i+1, j-1 {
+		messages[i], messages[j] = messages[j], messages[i]
+	}
+}
+
 // FindByAccountAndID retrieves a message scoped to an account.
 func (r *MessageRepo) FindByAccountAndID(ctx context.Context, accountID, id uint) (*model.Message, error) {
 	var message model.Message
@@ -201,4 +244,4 @@ func (r *MessageRepo) FindLastIncomingByConversation(ctx context.Context, conver
 		return nil, err
 	}
 	return &message, nil
-}
+}