<?php

	class TopicsEventHandler extends kCatDBEventHandler {

		/**
		 * Created url part for this module
		 *
		 * @param kEvent $event
		 */
		function BuildEnv(&$event)
		{
			$prefix_special = $event->getPrefixSpecial();
			$url_params = $event->getEventParam('url_params');
			$pass_events = $event->getEventParam('pass_events');

			$query_vars = $this->Application->getUnitOption($event->Prefix, 'QueryString');
			
			$event_key = array_search('event', $query_vars);
			if ($event_key) {
				// pass through event of this prefix
				unset($query_vars[$event_key]);
			}
			
			if (!getArrayValue($url_params, $prefix_special.'_event')) {
				// if empty event, then remove it from url
				unset( $url_params[$prefix_special.'_event'] );
			}
			
			//if pass events is off and event is not implicity passed
			if ( !$pass_events && !isset($url_params[$prefix_special.'_event']) )
			{
				unset($url_params[$prefix_special.'_event']); // remove event from url if requested
				//otherwise it will use value from get_var
			}

			if(!$query_vars) return true;

			$processed_params = Array();
			foreach($query_vars as $index => $var_name)
			{
				//if value passed in params use it, otherwise use current from application
				$var_name = $prefix_special.'_'.$var_name;
				$processed_params[$var_name] =  isset( $url_params[$var_name] ) ? $url_params[$var_name] : $this->Application->GetVar($var_name);
				if ( isset($url_params[$var_name]) ) unset( $url_params[$var_name] );
			}

			$ret = '';
			
			// topic		
			if($processed_params[$prefix_special.'_id'])
			{
				// this allows to fill 3 cache records with one query (see this method for details)
				$category_id = isset($url_params['m_cat_id']) ? $url_params['m_cat_id'] : $this->Application->GetVar('m_cat_id');
				$category_filename = $this->Application->getFilename('c', $category_id);
				
				// if template is also item template of category, then remove template
				$template = getArrayValue($url_params, 't');
				$item_template = $this->Application->getCache('item_templates', $category_id);
				if ($template == $item_template || strtolower($template) == '__default__') {
					unset($url_params['t']);
				}
				
				$ret .= $processed_params[$prefix_special.'_id'].'/';
			}

			if($processed_params[$prefix_special.'_Page'] > 1)
			{
				if ($processed_params[$prefix_special.'_Page']) $ret = rtrim($ret, '/');
				$ret .= '_'.$processed_params[$prefix_special.'_Page'].'/';
			}

			// post
			if($processed_params[$prefix_special.'_post_id'])
			{
				$ret .= $processed_params[$prefix_special.'_post_id'].'/';
			}

			if($processed_params[$prefix_special.'_Post_Page'] > 1)
			{
				if ($processed_params[$prefix_special.'_post_id']) $ret = rtrim($ret, '/');
				$ret .= '_'.$processed_params[$prefix_special.'_Post_Page'].'/';
			}

			// private message
			if($processed_params[$prefix_special.'_pm_id'])
			{
				$ret .= 'pm_'.$processed_params[$prefix_special.'_pm_id'].'/';
			}

			if($processed_params[$prefix_special.'_pm_Page'] > 1)
			{
				if ($processed_params[$prefix_special.'_pm_id']) $ret = rtrim($ret, '/');
				$ret .= '_'.$processed_params[$prefix_special.'_pm_Page'].'/';
			}

			$event->setEventParam('url_params', $url_params);
			$event->setEventParam('env_string', strtolower($ret) );
		}

		/**
		 * Process mod_rewrite url part left after previous parser
		 *
		 * @param kEvent $event
		 */
		function ParseEnv(&$event)
		{
			// <topic_id>_<topic_page>/<post_id>_<post_page>/<pm_id>_<pm_page>

			$url_parts = $event->getEventParam('url_parts');

			$defaults = Array('id' => 0, 'Page' => 1, 'Reviews_Page' => 1, 'post_id' => 0, 'Post_Page' => 1, 'pm_id' => 0, 'pm_Page' => 1);
			foreach ($defaults as $var_name => $var_value)
			{
				$this->Application->SetVar($event->getPrefixSpecial().'_'.$var_name, $var_value);
			}
			if (!$url_parts) {
				return false;
			}

			$ret = '';
			$url_part = array_shift($url_parts);

			if($url_part && substr($url_part,0,3) != 'pm_')
			{
				// match topic page
				if( preg_match('/(.*)_([\d]+)$/', $url_part, $rets) )
				{
					$url_part = $rets[1];
					$this->Application->SetVar( $event->getPrefixSpecial().'_Page', $rets[2]);
				}

				if (is_numeric($url_part)) {
					// match topic id (we don't use names here)
				$this->Application->SetVar($event->getPrefixSpecial().'_id', $url_part);
				$url_part = $url_parts ? array_shift($url_parts) : '';
			}
			}

			if($url_part && substr($url_part,0,3) != 'pm_')
			{
				// match post page
				if( preg_match('/(.*)_([\d]+)$/', $url_part, $rets) )
				{
					$url_part = $rets[1];
					$this->Application->SetVar( $event->getPrefixSpecial().'_Post_Page', $rets[2]);
				}

				if (is_numeric($url_part)) {
				// match post id
				$this->Application->SetVar($event->getPrefixSpecial().'_post_id', $url_part);
				$url_part = $url_parts ? array_shift($url_parts) : '';
			}
			}

			if($url_part && substr($url_part,0,3) == 'pm_')
			{
				$url_part = substr($url_part, 3, strlen($url_part) );
				// match private message page
				if( preg_match('/(.*)_([\d]+)$/', $url_part, $rets) )
				{
					$url_part = $rets[1];
					$this->Application->SetVar( $event->getPrefixSpecial().'_pm_Page', $rets[2]);
				}

				if (is_numeric($url_part)) {
				// match private message id
				$this->Application->SetVar($event->getPrefixSpecial().'_pm_id', $url_part);
				$url_part = $url_parts ? array_shift($url_parts) : '';
			}
			}
			
			if ($url_part) {
				array_unshift($url_parts, $url_part);
			}
			
			$event->setEventParam('url_parts', $url_parts);
		}
		
		/**
		 * Lock or unlock topic
		 *
		 * @param kEvent $event
		 */
		function OnToggleLock(&$event)
		{
			$object =& $event->getObject();
			
			$new_type = $object->GetDBField('TopicType') ? 0 : 1;
			$object->SetDBField('TopicType', $new_type);
			$object->Update();
		}
	}

?>