<?php

	/**
	 * Elgg calendar / entity / event functions.
	 * 
	 * @package Elgg
	 * @subpackage Core
	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
	 * @author Curverider Ltd
	 * @copyright Curverider Ltd 2008
	 * @link http://elgg.org/
	 */

	/**
	 * Calendar interface for events.
	 *
	 */
	interface Noteable {
	
		/**
		 * Calendar functionality.
		 * This function sets the time of an object on a calendar listing.
		 *
		 * @param int $hour If ommitted, now is assumed.
		 * @param int $minute If ommitted, now is assumed.
		 * @param int $second If ommitted, now is assumed.
		 * @param int $day If ommitted, now is assumed.
		 * @param int $month If ommitted, now is assumed.
		 * @param int $year If ommitted, now is assumed.
		 * @param int $duration Duration of event, remainder of the day is assumed.
		 */
		public function setCalendarTimeAndDuration($hour = NULL, $minute = NULL, $second = NULL, $day = NULL, $month = NULL, $year = NULL, $duration = NULL);
		
		/**
		 * Return the start timestamp.
		 */
		public function getCalendarStartTime();
		
		/**
		 * Return the end timestamp.
		 */
		public function getCalendarEndTime();
	}
	
	
	
	// All of these should either implemented in existing functions (with extra params) or new funcs
		// get entities by time 
		// get entities by metadata
		// get entities by relationship
		
	// Implement get/set via metadata
	
	
	/**
	 * Return a timestamp for the start of a given day (defaults today).
	 *
	 */
	function get_day_start($day = null, $month = null, $year = null) { return mktime(0,0,0,$month,$day,$year); }
	
	/**
	 * Return a timestamp for the end of a given day (defaults today).
	 *
	 */
	function get_day_end($day = null, $month = null, $year = null) { return mktime(23,59,59,$month,$day,$year); }
	
	/**
	 * Return the notable entities for a given time period.
	 *
	 * @param int $start_time The start time as a unix timestamp.
	 * @param int $end_time The end time as a unix timestamp.
	 * @param string $type The type of entity (eg "user", "object" etc)
	 * @param string $subtype The arbitrary subtype of the entity
	 * @param int $owner_guid The GUID of the owning user
	 * @param string $order_by The field to order by; by default, time_created desc
	 * @param int $limit The number of entities to return; 10 by default
	 * @param int $offset The indexing offset, 0 by default
	 * @param boolean $count Set to true to get a count rather than the entities themselves (limits and offsets don't apply in this context). Defaults to false.
	 * @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
	 * @param int|array $container_guid The container or containers to get entities from (default: all containers).
	 */
	function get_notable_entities($start_time, $end_time, $type = "", $subtype = "", $owner_guid = 0, $order_by = "asc", $limit = 10, $offset = 0, $count = false, $site_guid = 0, $container_guid = null)
	{
		global $CONFIG;
		
		if ($subtype === false || $subtype === null || $subtype === 0)
			return false;

		$start_time = (int)$start_time;
		$end_time = (int)$end_time;
		$order_by = sanitise_string($order_by);
		$limit = (int)$limit;
		$offset = (int)$offset;
		$site_guid = (int) $site_guid;
		if ($site_guid == 0)
			$site_guid = $CONFIG->site_guid;
			
		$where = array();
		
		if (is_array($type)) {			
			$tempwhere = "";
			if (sizeof($type))
			foreach($type as $typekey => $subtypearray) {
				foreach($subtypearray as $subtypeval) {
					$typekey = sanitise_string($typekey);
					if (!empty($subtypeval)) {
						$subtypeval = (int) get_subtype_id($typekey, $subtypeval);
					} else {
						$subtypeval = 0;
					}
					if (!empty($tempwhere)) $tempwhere .= " or ";
					$tempwhere .= "(e.type = '{$typekey}' and e.subtype = {$subtypeval})";
				}								
			}
			if (!empty($tempwhere)) $where[] = "({$tempwhere})";
			
		} else {
		
			$type = sanitise_string($type);
			$subtype = get_subtype_id($type, $subtype);
			
			if ($type != "")
				$where[] = "e.type='$type'";
			if ($subtype!=="")
				$where[] = "e.subtype=$subtype";
				
		}

		if ($owner_guid != "") {
			if (!is_array($owner_guid)) {
				$owner_array = array($owner_guid);
				$owner_guid = (int) $owner_guid;
				$where[] = "e.owner_guid = '$owner_guid'";
			} else if (sizeof($owner_guid) > 0) {
				$owner_array = array_map('sanitise_int', $owner_guid);
				// Cast every element to the owner_guid array to int
				$owner_guid = implode(",",$owner_guid); //
				$where[] = "e.owner_guid in ({$owner_guid})" ; //
			}
			if (is_null($container_guid)) {
				$container_guid = $owner_array;
			}
		}
		
		if ($site_guid > 0)
			$where[] = "e.site_guid = {$site_guid}";
			
		if (!is_null($container_guid)) {
			if (is_array($container_guid)) {
				foreach($container_guid as $key => $val) $container_guid[$key] = (int) $val;
				$where[] = "e.container_guid in (" . implode(",",$container_guid) . ")";
			} else {
				$container_guid = (int) $container_guid;
				$where[] = "e.container_guid = {$container_guid}";
			}
		}	
	
		// Add the calendar stuff
		$cal_join = "
			JOIN {$CONFIG->dbprefix}metadata cal_start on e.guid=cal_start.entity_guid
			JOIN {$CONFIG->dbprefix}metastrings cal_start_name on cal_start.name_id=cal_start_name.id
			JOIN {$CONFIG->dbprefix}metastrings cal_start_value on cal_start.value_id=cal_start_value.id
			
			JOIN {$CONFIG->dbprefix}metadata cal_end on e.guid=cal_end.entity_guid
			JOIN {$CONFIG->dbprefix}metastrings cal_end_name on cal_end.name_id=cal_end_name.id
			JOIN {$CONFIG->dbprefix}metastrings cal_end_value on cal_end.value_id=cal_end_value.id
		";	
		$where[] = "cal_start_name.string='calendar_start'";
		$where[] = "cal_start_value.string>=$start_time";
		$where[] = "cal_end_name.string='calendar_end'";
		$where[] = "cal_end_value.string <= $end_time";
		
		
		if (!$count) {
			$query = "SELECT e.* from {$CONFIG->dbprefix}entities e $cal_join where ";
		} else {
			$query = "SELECT count(e.guid) as total from {$CONFIG->dbprefix}entities e $cal_join where ";
		}
		foreach ($where as $w)
			$query .= " $w and ";
			
		$query .= get_access_sql_suffix('e'); // Add access controls
		
		if (!$count) {
			$query .= " order by n.calendar_start $order_by";
			if ($limit) $query .= " limit $offset, $limit"; // Add order and limit
			$dt = get_data($query, "entity_row_to_elggstar");
			return $dt;
		} else {
			$total = get_data_row($query);
			return $total->total;
		}
		
	}
	
	/**
	 * Return the notable entities for a given time period based on an item of metadata.
	 *
	 * @param int $start_time The start time as a unix timestamp.
	 * @param int $end_time The end time as a unix timestamp.
	 * @param mixed $meta_name 
	 * @param mixed $meta_value
	 * @param string $entity_type The type of entity to look for, eg 'site' or 'object'
	 * @param string $entity_subtype The subtype of the entity.
	 * @param int $limit 
	 * @param int $offset
	 * @param string $order_by Optional ordering.
	 * @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
	 * @param true|false $count If set to true, returns the total number of entities rather than a list. (Default: false)
	 * 
	 * @return int|array A list of entities, or a count if $count is set to true
	 */
	function get_notable_entities_from_metadata($start_time, $end_time, $meta_name, $meta_value = "", $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0, $count = false)
	{
		global $CONFIG;
		
		$meta_n = get_metastring_id($meta_name);
		$meta_v = get_metastring_id($meta_value);
			
		$start_time = (int)$start_time;
		$end_time = (int)$end_time;
		$entity_type = sanitise_string($entity_type);
		$entity_subtype = get_subtype_id($entity_type, $entity_subtype);
		$limit = (int)$limit;
		$offset = (int)$offset;
		if ($order_by == "") $order_by = "e.time_created desc";
		$order_by = sanitise_string($order_by);
		$site_guid = (int) $site_guid;
		if ((is_array($owner_guid) && (count($owner_guid)))) {
			foreach($owner_guid as $key => $guid) {
				$owner_guid[$key] = (int) $guid;
			}
		} else {
			$owner_guid = (int) $owner_guid;
		}
		if ($site_guid == 0)
			$site_guid = $CONFIG->site_guid;
			
		//$access = get_access_list();
			
		$where = array();
		
		if ($entity_type!="")
			$where[] = "e.type='$entity_type'";
		if ($entity_subtype)
			$where[] = "e.subtype=$entity_subtype";
		if ($meta_name!="")
			$where[] = "m.name_id='$meta_n'";
		if ($meta_value!="")
			$where[] = "m.value_id='$meta_v'";
		if ($site_guid > 0)
			$where[] = "e.site_guid = {$site_guid}";
		if (is_array($owner_guid)) {
			$where[] = "e.container_guid in (".implode(",",$owner_guid).")";
		} else if ($owner_guid > 0)
			$where[] = "e.container_guid = {$owner_guid}";
			
		// Add the calendar stuff
		$cal_join = "
			JOIN {$CONFIG->dbprefix}metadata cal_start on e.guid=cal_start.entity_guid
			JOIN {$CONFIG->dbprefix}metastrings cal_start_name on cal_start.name_id=cal_start_name.id
			JOIN {$CONFIG->dbprefix}metastrings cal_start_value on cal_start.value_id=cal_start_value.id
			
			JOIN {$CONFIG->dbprefix}metadata cal_end on e.guid=cal_end.entity_guid
			JOIN {$CONFIG->dbprefix}metastrings cal_end_name on cal_end.name_id=cal_end_name.id
			JOIN {$CONFIG->dbprefix}metastrings cal_end_value on cal_end.value_id=cal_end_value.id
		";	
		$where[] = "cal_start_name.string='calendar_start'";
		$where[] = "cal_start_value.string>=$start_time";
		$where[] = "cal_end_name.string='calendar_end'";
		$where[] = "cal_end_value.string <= $end_time";
		
		if (!$count) {
			$query = "SELECT distinct e.* "; 
		} else {
			$query = "SELECT count(distinct e.guid) as total ";
		}
			
		$query .= "from {$CONFIG->dbprefix}entities e $cal_join JOIN {$CONFIG->dbprefix}metadata m on e.guid = m.entity_guid where";
		foreach ($where as $w)
			$query .= " $w and ";
		$query .= get_access_sql_suffix("e"); // Add access controls
		$query .= ' and ' . get_access_sql_suffix("m"); // Add access controls
		
		if (!$count) {
			$query .= " order by $order_by limit $offset, $limit"; // Add order and limit
			return get_data($query, "entity_row_to_elggstar");
		} else {
			if ($row = get_data_row($query))
				return $row->total;
		}
		return false;
		
	}
	
	/**
	 * Return the notable entities for a given time period based on their relationship.
	 *
	 * @param int $start_time The start time as a unix timestamp.
	 * @param int $end_time The end time as a unix timestamp.
	 * @param string $relationship The relationship eg "friends_of"
	 * @param int $relationship_guid The guid of the entity to use query
	 * @param bool $inverse_relationship Reverse the normal function of the query to instead say "give me all entities for whome $relationship_guid is a $relationship of"
	 * @param string $type 
	 * @param string $subtype
	 * @param int $owner_guid
	 * @param string $order_by
	 * @param int $limit
	 * @param int $offset
	 * @param boolean $count Set to true if you want to count the number of entities instead (default false)
	 * @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
	 * @return array|int|false An array of entities, or the number of entities, or false on failure
	 */
	function get_noteable_entities_from_relationship($start_time, $end_time, $relationship, $relationship_guid, $inverse_relationship = false, $type = "", $subtype = "", $owner_guid = 0, $order_by = "", $limit = 10, $offset = 0, $count = false, $site_guid = 0)
	{
		$start_time = (int)$start_time;
		$end_time = (int)$end_time;
	}
	
	/**
	 * Get all entities for today.
	 *
	 * @param string $type The type of entity (eg "user", "object" etc)
	 * @param string $subtype The arbitrary subtype of the entity
	 * @param int $owner_guid The GUID of the owning user
	 * @param string $order_by The field to order by; by default, time_created desc
	 * @param int $limit The number of entities to return; 10 by default
	 * @param int $offset The indexing offset, 0 by default
	 * @param boolean $count Set to true to get a count rather than the entities themselves (limits and offsets don't apply in this context). Defaults to false.
	 * @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
	 * @param int|array $container_guid The container or containers to get entities from (default: all containers).
	 */
	function get_todays_entities($type = "", $subtype = "", $owner_guid = 0, $order_by = "", $limit = 10, $offset = 0, $count = false, $site_guid = 0, $container_guid = null)
	{
		$day_start = get_day_start();
		$day_end = get_day_end();
		
		return get_notable_entities($day_start, $day_end, $type, $subtype, $owner_guid, $order_by, $limit, $offset, $count, $site_guid, $container_guid);
	}
	
	/**
	 * Get entities for today from metadata.
	 *
	 * @param mixed $meta_name 
	 * @param mixed $meta_value
	 * @param string $entity_type The type of entity to look for, eg 'site' or 'object'
	 * @param string $entity_subtype The subtype of the entity.
	 * @param int $limit 
	 * @param int $offset
	 * @param string $order_by Optional ordering.
	 * @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
	 * @param true|false $count If set to true, returns the total number of entities rather than a list. (Default: false)
	 * 
	 * @return int|array A list of entities, or a count if $count is set to true
	 */
	function get_todays_entities_from_metadata($meta_name, $meta_value = "", $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0, $count = false)
	{
		$day_start = get_day_start();
		$day_end = get_day_end();
		
		return get_notable_entities_from_metadata($day_start, $day_end, $meta_name, $meta_value, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, $order_by, $site_guid, $count);
	}
	
	/**
	 * Get entities for today from a relationship
	 *
	 * @param string $relationship The relationship eg "friends_of"
	 * @param int $relationship_guid The guid of the entity to use query
	 * @param bool $inverse_relationship Reverse the normal function of the query to instead say "give me all entities for whome $relationship_guid is a $relationship of"
	 * @param string $type 
	 * @param string $subtype
	 * @param int $owner_guid
	 * @param string $order_by
	 * @param int $limit
	 * @param int $offset
	 * @param boolean $count Set to true if you want to count the number of entities instead (default false)
	 * @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
	 * @return array|int|false An array of entities, or the number of entities, or false on failure
	 */
	function get_todays_entities_from_relationship($relationship, $relationship_guid, $inverse_relationship = false, $type = "", $subtype = "", $owner_guid = 0, $order_by = "", $limit = 10, $offset = 0, $count = false, $site_guid = 0)
	{
		$day_start = get_day_start();
		$day_end = get_day_end();
		
		return get_notable_entities_from_relationship($day_start, $day_end, $relationship, $relationship_guid, $inverse_relationship, $type, $subtype, $owner_guid, $order_by, $limit, $offset, $count, $site_guid);
	}
?>