<?php

	define('hBEFORE',1);
	define('hAFTER',2);

	class kEventManager extends kDBBase {
		
		
		/**
		 * Cache of QueryString parameters
		 * from config, that are represented
		 * in enviroment variable
		 *
		 * @var Array
		 */
		var $queryMaps=Array();
		
		/**
		 * Build events registred for
		 * pseudo classes. key - pseudo class
		 * value - event name
		 *
		 * @var Array
		 * @access private
		 */
		var $buildEvents=Array();
		
		/**
		 * Holds before hooks
		 * key - prefix.event (to link to)
		 * value - hooked event info
		 *
		 * @var Array
		 * @access private
		 */
		var $beforeHooks=Array();
		
		/**
		 * Holds after hooks
		 * key - prefix.event (to link to)
		 * value - hooked event info
		 *
		 * @var Array
		 * @access private
		 */
		var $afterHooks=Array();
		
		/**
		 * Set's new enviroment parameter mappings
		 * between their names as application vars
		 *
		 * @param Array $new_query_maps
		 * @access public
		 */
		function setQueryMaps($new_query_maps)
		{
			$this->queryMaps=$new_query_maps;
		}
		
		function registerBuildEvent($pseudo_class,$build_event_name)
		{
			$this->buildEvents[$pseudo_class]=$build_event_name;
		}
		
		/**
		 * Returns build event by pseudo class
		 * name if any defined in config
		 *
		 * @param string $pseudo_class
		 * @return kEvent
		 * @access public
		 */
		function &getBuildEvent($pseudo_class)
		{
			if( !isset($this->buildEvents[$pseudo_class]) ) return false;
			
			$event = new kEvent();
			$event->Name=$this->buildEvents[$pseudo_class];
			$event->MasterEvent=null;
			return $event;
		}
		
		/**
		 * Allows to process any type of event
		 *
		 * @param kEvent $event
		 * @access public
		 */
		function HandleEvent(&$event)
		{
			$event_handler =& $this->Application->recallObject($event->Prefix.'_EventHandler');
			$event_handler->processEvent(&$event);
		}
		
		function ProcessRequest()
		{
			// 1. get events from $_POST
			$events=$this->Application->GetVar('events');
			if($events===false) $events=Array();
			// 2. if nothing there, then try to find them in $_GET
			if($this->queryMaps && !$events) 
			{
				// if we got $_GET type submit (links, not javascript)
				foreach($this->queryMaps as $prefix_special => $query_map)
				{
					$query_map=array_flip($query_map);
					if(isset($query_map['event']))
					{
						$events[$prefix_special]=$this->Application->GetVar($prefix_special.'_event');	
					}
				}
			}
			
			//print_pre($events);
			foreach($events as $prefix_special => $event_name)
			{
				if(!$event_name) continue;
				$event = new kEvent();
				$event->Name=$event_name;
				$event->Prefix_Special=$prefix_special;
				
				$prefix_special=explode('.',$prefix_special);
				$event->Prefix=$prefix_special[0];
				$event->Special=isset($prefix_special[1])?$prefix_special[1]:'';
				
				$event->redirect=$this->Application->RecallVar('redirect_to');
				$this->HandleEvent(&$event);
			}
		}
		
		function registerHook($hookto_unit, $hookto_event_name, $mode, $do_unit, $do_event_name)
		{
			
			
		}
		
		function processHooks(&$event, $mode)
		{
			
			
		}
		
		/**
		 * Set's new event for $prefix_special
		 * passed
		 *
		 * @param string $prefix_special
		 * @param string $event_name
		 * @access public
		 */
		function setEvent($prefix_special,$event_name)
		{
			$actions =& $this->Application->recallObject('kActions');
			$actions->Set('events['.$prefix_special.']',$event_name);
		}

	}


?>