<?php
	class CustomFieldsEventHandler extends InpDBEventHandler {
	
		/**
		 * Apply any custom changes to list's sql query
		 *
		 * @param kEvent $event
		 * @access protected
		 * @see OnListBuild
		 */
		function SetCustomQuery(&$event)
		{
			$object =& $event->getObject();
			
			$item_type=$this->Application->GetVar('cf_type');
			$object->addFilter('itemtype_filter', '%1$s.Type = '.$item_type);
			//$object->AddOrderField('DisplayOrder', 'ASC');
		}
		
		/**
		 * Prevents from duplicate item creation
		 *
		 * @param kEvent $event
		 */
		function OnBeforeItemCreate(&$event)
		{
			$object =& $event->getObject();
			
			$live_table = $this->Application->getUnitOption($event->Prefix, 'TableName');
			$sql = 'SELECT COUNT(*)
					FROM '.$live_table.'
					WHERE FieldName = '.$this->Conn->qstr($object->GetDBField('FieldName')).' AND Type = '.$object->GetDBField('Type');
			$found = $this->Conn->GetOne($sql);
		
			if ($found) {
				$event->status = erFAIL;
				$object->SetError('FieldName', 'duplicate', 'la_error_CustomExists');
			}
		}
		
		/**
		 * Occurse after deleting item, id of deleted item
		 * is stored as 'id' param of event
		 *
		 * @param kEvent $event
		 * @access public
		 */
		function OnAfterItemDelete(&$event)
		{
			$object =& $event->getObject();
			$custom_field_id=$event->getEventParam('id');
			$this->Application->SetVar('cf_id', '');
			
			$sql='DELETE FROM '.TABLE_PREFIX.'CustomMetaData WHERE CustomFieldId = '.$custom_field_id;
			$this->Conn->Query($sql);
		}
		
		function OnMassDelete(&$event)
		{
			parent::OnMassDelete($event);
			$event->redirect_params = Array('opener' => 's');
		}
		
		/**
		 * Prepare temp tables for creating new item
		 * but does not create it. Actual create is
		 * done in OnPreSaveCreated
		 *
		 * @param kEvent $event
		 */
		function OnPreCreate(&$event)
		{
			parent::OnPreCreate($event);

			$object =& $event->getObject();
			$object->SetDBField('Type', $this->Application->GetVar('cf_type'));
		}
	}
?>