<?php

	class CustomDataEventHandler extends kDBEventHandler {

		/**
		 * [HOOK] Allows to apply custom fields functionality to specific config
		 * When main item is created, then cdata config is cloned
		 *
		 * @param kEvent $event
		 */
		function OnDefineCustomFields(&$event)
		{
			// 1. clone customdata table
			$clones = $this->Application->getUnitOption('cdata', 'Clones');
			$clones[$event->MasterEvent->Prefix.'-cdata'] = Array (
				'ParentPrefix' => $event->MasterEvent->Prefix,
				'TableName' => $this->Application->getUnitOption($event->MasterEvent->Prefix, 'TableName').'CustomData',
			);
			$this->Application->setUnitOption('cdata', 'Clones', $clones);

			// 2. add custom field information to main item
			$this->createCustomFields($event->MasterEvent->Prefix);
		}

		function scanCustomFields($prefix)
		{
			if (defined('IS_INSTALL') && IS_INSTALL && !$this->Application->TableFound('CustomField')) {
				return false;
			}

			if (!$prefix) {
				// prefix not specified
				return false;
			}

			$item_type = $this->Application->getUnitOption($prefix, 'ItemType');
			if (!$item_type) {
				// no main config of such type
				return false;
			}

			// get custom field information
			$sql = 'SELECT *
					FROM '.TABLE_PREFIX.'CustomField
					WHERE Type = '.$item_type.'
					ORDER BY CustomFieldId';
			$custom_fields = $this->Conn->Query($sql, 'CustomFieldId');
			if (!$custom_fields) {
				// config doesn't have custom fields
				return false;
			}

			return $custom_fields;
		}

		/**
		 * Fills cloned cdata config with data from it's parent
		 *
		 * @param kEvent $event
		 */
		function OnAfterConfigRead(&$event)
		{
			$main_prefix = $this->Application->getUnitOption($event->Prefix, 'ParentPrefix');

			$custom_fields = $this->scanCustomFields($main_prefix);
			if (!$custom_fields) {
				return false;
			}

			// 2. create fields (for customdata item)
			$fields = $this->Application->getUnitOption($event->Prefix, 'Fields', Array());
			$field_options = Array('type' => 'string', 'formatter' => 'kMultiLanguage', 'db_type' => 'text', 'default' => '');
			foreach ($custom_fields as $custom_id => $custom_params) {
				if (isset($fields['cust_'.$custom_id])) continue;
				$fields['cust_'.$custom_id] = $field_options;
				$fields['cust_'.$custom_id]['force_primary'] = !$custom_params['MultiLingual'];
			}
			$this->Application->setUnitOption($event->Prefix, 'Fields', $fields);
		}

		/**
		 * Creates "cust_<custom_name>" virtual fields for main item
		 *
		 * @param string $prefix
		 */
		function createCustomFields($prefix)
		{
			$custom_fields = $this->scanCustomFields($prefix);
			if (!$custom_fields) {
				return false;
			}

			$calculated_fields = Array();
			$virtual_fields = $this->Application->getUnitOption($prefix, 'VirtualFields', Array());

			$cf_helper =& $this->Application->recallObject('InpCustomFieldsHelper');
			$field_options = Array('type' => 'string', 'not_null' => 1, 'default' => '');
			$ml_formatter =& $this->Application->recallObject('kMultiLanguage');
			/* @var $ml_formatter kMultiLanguage */

			foreach ($custom_fields as $custom_id => $custom_params) {
				switch ($custom_params['ElementType']) {
					case 'date':
					case 'datetime':
						unset($field_options['options']);
						$field_options['formatter'] = 'kDateFormatter';
						break;

					case 'select':
					case 'multiselect':
					case 'radio':
						if ($custom_params['ValueList']) {
							$field_options['options'] = $cf_helper->GetValuesHash($custom_params['ValueList']);
							$field_options['formatter'] = 'kOptionsFormatter';
						}
						break;

					default:
						unset($field_options['options'], $field_options['formatter']);
						break;
				}

				$custom_name = $custom_params['FieldName'];
				$calculated_fields['cust_'.$custom_name] = 'cust.'.$ml_formatter->LangFieldName('cust_'.$custom_id, !$custom_params['MultiLingual']);
				if (!isset($virtual_fields['cust_'.$custom_name])) {
					$virtual_fields['cust_'.$custom_name] = Array();
				}
				$virtual_fields['cust_'.$custom_name] = array_merge_recursive2($field_options, $virtual_fields['cust_'.$custom_name]);
				$custom_fields[$custom_id] = $custom_name;
			}

			$config_calculated_fields = $this->Application->getUnitOption($prefix, 'CalculatedFields', Array());
			foreach ($config_calculated_fields as $special => $special_fields) {
				$config_calculated_fields[$special] = array_merge_recursive2($config_calculated_fields[$special], $calculated_fields);
			}
			$this->Application->setUnitOption($prefix, 'CalculatedFields', $config_calculated_fields);

			$this->Application->setUnitOption($prefix, 'CustomFields', $custom_fields);
			$this->Application->setUnitOption($prefix, 'VirtualFields', $virtual_fields);
		}
	}
?>