<?php
	/**
	 * Elgg statistics library.
	 * This file contains a number of functions for obtaining statistics about the running system.
	 * These statistics are mainly used by the administration pages.
	 * 
	 * @package Elgg
	 * @subpackage Core
	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
	 * @author Marcus Povey
	 * @copyright Curverider Ltd 2008
	 * @link http://elgg.org/
	 */


	// number of users
	
	// Number of objects broken down into type
		
	// who' s online now
	
	/**
	 * Return an array reporting the number of various entities in the system.
	 * 
	 * @return array
	 */
	function get_entity_statistics()
	{
		global $CONFIG;
		
		$entity_stats = array();
		
		// Get a list of major types
		$types = get_data("SELECT distinct e.type,s.subtype,e.subtype as subtype_id from {$CONFIG->dbprefix}entities e left join {$CONFIG->dbprefix}entity_subtypes s on e.subtype=s.id");
		foreach ($types as $type) {
			if (!is_array($entity_stats[$type->type])) 
				$entity_stats[$type->type] = array(); // assume there are subtypes for now
			
			$query = "SELECT count(*) as count from {$CONFIG->dbprefix}entities where type='{$type->type}'";
			if ($type->subtype) $query.= " and subtype={$type->subtype_id}";
			$subtype_cnt = get_data($query);
			
			if ($type->subtype)
				$entity_stats[$type->type][$type->subtype] = $subtype_cnt->count;
			else
				$entity_stats[$type->type]['__base__'] = $subtype_cnt->count;	
		}
		
		return $entity_stats;
	}
?>