<?php if (!defined('VB_ENTRY')) die('Access denied.');
/*========================================================================*\
|| ###################################################################### ||
|| # vBulletin 5.4.0 Release Candidate 1 - Nulled by xFWarez.is
|| # ------------------------------------------------------------------ # ||
|| # Copyright 2000-2018 vBulletin Solutions Inc. All Rights Reserved.  # ||
|| # This file may not be redistributed in whole or significant part.   # ||
|| # ----------------- VBULLETIN IS NOT FREE SOFTWARE ----------------- # ||
|| # http://www.vbulletin.com | http://www.vbulletin.com/license.html   # ||
|| ###################################################################### ||
\*========================================================================*/

/**
 * vB_Api_Search
 *
 * @package vBApi
 * @access public
 */
class vB_Api_Search extends vB_Api
{
	private static $badwords;
	private static $allbadwords;
	private static $goodwords;
	protected $search_json;
	protected $criteria;
	protected $channelCache = null;
	const FILTER_STARTER_ONLY = 'starter_only';
	const FILTER_LASTVISIT = 'lastVisit';
	const FILTER_TOPICAGE = 'topicAge';
	const FILTER_CHANNELAGE = 'channelAge';
	const FILTER_LASTDAY = 'lastDay';
	const FILTER_LASTWEEK = 'lastWeek';
	const FILTER_LASTMONTH = 'lastMonth';
	const FILTER_LASTYEAR = 'lastYear';
	const FILTER_DATEALL = 'all';
//	const FILTER_VIEW_CHANNEL = 'channel';
	const FILTER_VIEW_ACTIVITY = 'activity';
	const FILTER_VIEW_TOPIC = 'topic';
	const FILTER_VIEW_CONVERSATION_THREAD = 'conversation_thread';
	const FILTER_VIEW_CONVERSATION_THREAD_SEARCH = 'conversation_thread_search';
	const FILTER_VIEW_CONVERSATION_STREAM = 'conversation_stream';
	const FILTER_FOLLOWING_USERS = 'followMembers';
	const FILTER_FOLLOWING_CHANNEL = 'followChannel';
	const FILTER_FOLLOWING_ALL = 'followAll';
	const FILTER_FOLLOWING_BOTH = 'followBoth';
	const FILTER_FOLLOWING_CONTENT = 'followContent';
	const FILTER_FOLLOW = 'follow';
	// FILTER_MARKED_READ is unimplemented. To implement this, add a JSON->filter translation
	// in json2criteria(), & add the filter in DB & sphinx searches. For an ex., see the
	// FILTER_MARKED_UNREAD implementation.
	const FILTER_MARKED_READ = 'read';
	const FILTER_MARKED_UNREAD = 'unread';
	const FILTER_SHOW_TEXT = 'vBForum_Text';
	const FILTER_SHOW_GALLERY = 'vBForum_Gallery';
	const FILTER_SHOW_VIDEO = 'vBForum_Video';
	const FILTER_SHOW_LINK = 'vBForum_Link';
	const FILTER_SHOW_POLL = 'vBForum_Poll';
	const FILTER_SHOW_EVENT = 'vBForum_Event';

	const SEARCH_TYPE_SYSTEM = 0; // for system searches
	const SEARCH_TYPE_USER = 1; // for user request searches
	const IGNORE_CACHE = false;
	protected static $cache_ttl_sec;

	protected static $showFilterList = array(
		vB_Api_Search::FILTER_SHOW_TEXT,
		vB_Api_Search::FILTER_SHOW_GALLERY,
		vB_Api_Search::FILTER_SHOW_VIDEO,
		vB_Api_Search::FILTER_SHOW_LINK,
		vB_Api_Search::FILTER_SHOW_POLL,
		vB_Api_Search::FILTER_SHOW_EVENT,
	);

	/**
	 * Returns the cache ttl in seconds
	 *
	 * @return	int		time in seconds
	 */
	public static function getCacheTTL()
	{
		if (!isset(self::$cache_ttl_sec))
		{
			self::$cache_ttl_sec = vB::getDatastore()->getOption('search_cache_ttl');
		}
		return self::$cache_ttl_sec;
	}
	/**
	 * Search for nodes
	 * @param string|array|object $search_json list of parameters that can be encoded in a json string
	 * @param int $searchType
	 * @return int result_id
	 */

	// TODO: $searchType shouldn't have a default value, but be explicitely declared in each call
	public function getSearchResult($search_json, $searchType = 0)
	{
		if (!is_string($search_json))
		{
			$search_json = json_encode($search_json);
		}
		$criteria = $this->json2criteria($search_json);
		//there's an error in the json criteria, not doing a search
		if (!empty($search_json['error']))
		{
			$return_structure = vB_Search_Core::instance()->cacheResults(array(), $criteria, 0, $searchType);
			$return_structure['ignored_keywords'] = $criteria->get_ignored_keywords();
			$return_structure['totalRecords'] = 0;
			return $return_structure;
		}
		elseif (!$criteria->getIgnoreCache())
		{
			//check if there is a cached result set with this criteria
			$searchlog = vB_Search_Core::instance()->getFromCache($criteria, $search_json);
			if ($searchlog !== false)
			{
				//found a cached result set, no need to do a new search
				return $searchlog;
			}
		}
		// this searchJSON will contain the custom fields
		if (!empty($search_json['custom']))
		{
			$criteria->setJSON($search_json);
		}

		return $this->getSearchResultsCriteria($criteria, $searchType);
	}

	/**
	 * Search for nodes
	 * @param vB_Search_Criteria $criteria a criteria object
	 * @return int result_id
	 */
	protected function getSearchResultsCriteria(vB_Search_Criteria $criteria, $searchType)
	{
		//first let's see if this is valid.
		$userdata = vB::getUserContext()->getReadChannels();

		if (empty($userdata['canRead']) AND empty($userdata['selfOnly']))
		{
			throw new vB_Exception_Api('no_permission');
		}

		$json = $criteria->getJSON();
		$results = array();
		$records_nr = 0;

		$time_before = $time_after = microtime(true);

		if ($searchType == self::SEARCH_TYPE_USER)
		{
			// user requested this search, so we need to check flooding
			vB_Search_Core::instance()->floodCheck();
		}

		if (empty($json['error']))
		{
			$results = vB_Search_Core::instance()->getResults($criteria);
			$time_after = microtime(true);
		}

		$return_structure = vB_Search_Core::instance()->cacheResults($results, $criteria, $time_after - $time_before, $searchType);

		//need to duplicate the cache so it can be picked up in case the custom field is not provided.
		//having a custom field generated a different hash but has the same results
		if (!empty($json['custom']))
		{
			unset($json['custom']);
			$criteria->setJSON($json);
			vB_Search_Core::instance()->cacheResults($results, $criteria, $time_after - $time_before, $searchType);
		}

		$return_structure['ignored_keywords'] = $criteria->get_ignored_keywords();
		$return_structure['totalRecords'] = count($results);

		return $return_structure;
	}

	/**
	 * Search for nodeids and returns the resultid as well as the page value
	 *
	 * (avoids having to make a call for the resultid and immediately make another to fetch the page value)
	 *
	 * @param string|array|object $search_json list of parameters that can be encoded in a json string
	 * @param int $pagenumber pagination - the page number
	 * @param int $perpage pagination - the number of results per page
	 * @return array node_ids
	 */
	public function getInitialNodes($search_json, $perpage = false, $pagenumber = false, $getStarterInfo = false)
	{
		if (!is_string($search_json))
		{
			$search_json = json_encode($search_json);
		}

		$result = $this->getSearchResult($search_json);

		return $this->getMoreNodes($result, $perpage, $pagenumber, $getStarterInfo);
	}

	/**
	 * Search for nodes and returns the resultid as well as the page value
	 *
	 * (avoids having to make a call for the resultid and immediately make another to fetch the page value)
	 *
	 * @param string|array|object $search_json list of parameters that can be encoded in a json string
	 * @param int $perpage pagination - the number of results per page
	 * @param int $pagenumber pagination - the page number
	 * @param bool $getStarterInfo
	 * @param int $searchType
	 * @return array search_result_structure
	 */
	public function getInitialResults($search_json, $perpage = false, $pagenumber = false, $getStarterInfo = false, $searchType = 0)
	{
		if (!is_string($search_json))
		{
			$search_json = json_encode($search_json);
		}

		// this returns the nodeids in $result['results']
		$result = $this->getSearchResult($search_json, $searchType);

		try
		{
			// this adds all the actual node information based on nodeids
			return $this->getMoreResults($result, $perpage, $pagenumber, $getStarterInfo);
		}
		catch (vB_Exception_NodePermission $e)
		{
			if (!empty($result['from_cache']))
			{
				vB_Library::instance('search')->purgeCacheForCurrentUser();
				// for the second attempt, we consider it a system search request (no need to perform flood check again)
				return $this->getInitialResults($search_json, $perpage, $pagenumber, $getStarterInfo, self::SEARCH_TYPE_SYSTEM);
			}
			else
			{
				$nodeid = $e->getNodeId();
				if (empty($nodeid) OR !is_numeric($nodeid))
				{
					throw $e;
				}

				$newSet = vB_Search_Core::instance()->removeNodeFromResult($nodeid, $result, $perpage, $pagenumber, $getStarterInfo);

				if ($newSet === false)
				{
					throw $e;
				}
				else
				{
					return $newSet;
				}
			}
		}
	}

	/**
	 * Get the node_ids from a search resultId
	 * @param int $resultId id of the search result
	 * @param int $perpage pagination - the number of results per page
	 * @param int $pagenumber pagination - the page number
	 * @return array result structure without node content (only nodeids)
	 */
	public function getMoreNodes($resultId, $perpage = false, $pagenumber = false)
	{
		$cacheLife = self::getCacheTTL();

		if (is_array($resultId))
		{
			$cache = $resultId;
			$resultId = $cache['resultId'];
			if (!is_numeric($resultId))
			{
				throw new vB_Exception_Api('invalid_search_syntax');
			}
		}

		if (is_numeric($resultId))
		{
			$cache = vB_Search_Core::instance()->getCache($resultId);
			if (empty($cache))
			{
				throw new vB_Exception_Api('invalid_search_resultid');
			}

			//remember $cacheLife is minutes and everything else is seconds.
			if ($cache['dateline'] < vB::getRequest()->getTimeNow() - ($cacheLife * 60))
			{
				$json = json_decode($cache['json'], true);
				$json['sort'] = array($cache['sortby'] => $cache['sortorder']);
				$cache['json'] = json_encode($json);
				return $this->getInitialNodes($cache['json'], $perpage, $pagenumber);
			}
		}
		else
		{
			throw new vB_Exception_Api('invalid_search_syntax', array($resultId));
		}

		$return_structure['resultId'] = $resultId;
		$pagenumber = intval($pagenumber);
		$return_structure['pagenumber'] = $pagenumber;

		$return_structure['totalRecords'] = $cache['results_count'];
		$return_structure['searchJSON'] = $cache['json'];
		$return_structure['searchJSONStructure'] = json_decode($cache['json'],true);
		$return_structure['searchtime'] = vb_number_format($cache['searchtime'], 4);
		$return_structure['hasMore'] = false;

		$perpage = intval($perpage);
		if (!empty($perpage))
		{
			$return_structure['perpage'] = $perpage;
			$pagenumber = max($pagenumber, 1);
			$return_structure['totalpages'] = ceil($return_structure['totalRecords']/$perpage);
			$return_structure['pagenumber'] = min($pagenumber, $return_structure['totalpages']);
			$start = (($return_structure['pagenumber'] - 1) * $perpage);
			$return_structure['from'] = $start+1;
		}
		else
		{
			$return_structure['perpage'] = $return_structure['totalRecords'];
			$return_structure['totalpages'] = 1;
			$return_structure['pagenumber'] = 1;
			$return_structure['from'] = 1;
			$start = 0;
		}

		$return_structure['nodeIds'] = array();
		if (!empty($cache['results']))
		{
			$return_structure['nodeIds'] = explode(',', $cache['results']);
		}
		if (!empty($cache['ignored_keywords']))
		{
			$return_structure['ignored_keywords'] = $cache['ignored_keywords'];
		}
		$return_structure['hasMore'] = count($return_structure['nodeIds']) > ($return_structure['from'] - 1 + $return_structure['perpage']);

		if ($start > count($return_structure['nodeIds']))
		{
			return $return_structure;
			//throw new Exception('no_more_results');
		}
		if (!empty($return_structure['nodeIds']))
		{
			$return_structure['nodeIds'] = array_slice($return_structure['nodeIds'], $start, $return_structure['perpage']);
			$return_structure['nodeIds'] = array_combine($return_structure['nodeIds'], $return_structure['nodeIds']);
		}

		$return_structure['to'] = $start + count($return_structure['nodeIds']);

		$nextUrl = $prevUrl = '';
		$baseurl = vB::getDatastore()->getOption('frontendurl');
		$search_params = array (
			'r' => $resultId
		);
		$url = $baseurl . vB5_Route::buildUrl('search', array(),$search_params);

		if ($return_structure['pagenumber'] < $return_structure['totalpages'])
		{
			$search_params['p'] = $return_structure['pagenumber'] + 1;
			$nextUrl = $baseurl . vB5_Route::buildUrl('search', array(),$search_params);
		}
		if ($return_structure['pagenumber'] > 1)
		{
			$search_params['p'] = $return_structure['pagenumber'] - 1;
			$prevUrl = $baseurl . vB5_Route::buildUrl('search', array(),$search_params);
		}

		$return_structure['pagination'] = array(
			'startcount' => $return_structure['from'],
			'endcount' => $return_structure['to'],
			'totalcount' => $return_structure['totalRecords'],
			'currentpage' => $return_structure['pagenumber'],
			'prevurl' => $prevUrl,
			'nexturl' => $nextUrl,
			"baseurl" => $url,
			'totalpages' =>$return_structure['totalpages']
		);

		return $return_structure;
	}

	/**
	 * Get the nodes from a search resultId
	 *
	 * @param  int   $resultId id of the search result
	 * @param  int   $perpage pagination - the number of results per page
	 * @param  int   $pagenumber pagination - the page number
	 *
	 * @return array List of nodes in the resultId
	 */
	public function getMoreResults($resultId, $perpage = false, $pagenumber = false, $getStarterInfo = false)
	{
		$return_structure = $this->getMoreNodes($resultId, $perpage, $pagenumber);

		$return_structure['results'] = vB_Library::instance('Node')->getFullContentforNodes($return_structure['nodeIds'], array('withParent' => $getStarterInfo, 'showVM' => 1));
		//note that getFullContentforNodes returns an element ['content']['permissions']['canviewthreads']

		foreach($return_structure['results'] AS $key => $result)
		{
			$return_structure['results'][$key] = vB_Api_Content::getContentApi($result['contenttypeid'])->cleanPreviewContent($return_structure['results'][$key]);
		}

		return $return_structure;
	}

	public function getInfo($resultId)
	{
		$assertor = vB::getDbAssertor();
		$cache = vB_Search_Core::instance()->getCache($resultId);
		$return_structure['resultId'] = $resultId;
		if (empty($cache))
		{
			throw new Exception('results_not_found');
		}
		$return_structure['totalRecords'] = $cache['results_count'];
		$return_structure['searchJSONStructure'] = $searchJSONStructure = json_decode($cache['json'], true);
		$re_encode = false;
		if (isset($searchJSONStructure['ignored_words']))
		{
			unset($searchJSONStructure['ignored_words']);
			$re_encode = true;
		}
		if (isset($searchJSONStructure['original_keywords']))
		{
			$searchJSONStructure['keywords'] = $searchJSONStructure['original_keywords'];
			unset($searchJSONStructure['original_keywords']);
			$re_encode = true;

		}
		if (isset($searchJSONStructure['error']))
		{
			unset($searchJSONStructure['error']);
			$re_encode = true;
		}

		$return_structure['searchJSON'] = $re_encode ? json_encode($searchJSONStructure) : $cache['json'];
		return $return_structure;
	}

	/**
	 * Get the page number where the specified node is at on the node list.
	 * @param int $nodeid			The node id
	 * @param array $starter	The starter array
	 * @param int $perpage 			The number of nodes per page the node list is using
	 * @param int $depth			The depth - 0 means no stopping, otherwise 1= direct child, 2= grandchild, etc
	 * @param string $sort			The sort order of the node list, 'asc' or 'desc'
	 * @param bool $include_starter	The flag to indicate if the starter node should be included in the node list or not
	 * @param string $type			The content type filter to use. Must be one of the strings defined in self::$showFilterList
	 * @return int					The page number of the specified node. 0 means the node was not found.
	 */
	public function getPageNumber($nodeid, $starter, $perpage = 20, $depth = 0, $sort = 'asc', $include_starter = true, $type = '')
	{
		if (!is_array($starter))
		{
			 throw new vB_Exception_Api('invalid_data_w_x_y_z', array($starter, 'starter', __CLASS__, __FUNCTION__));
		}

		$pagenum = 0;
		/* 	since comments' nodeid don't reflect what page they are on, we need to check
		 *	the closure table then return the page number of its parent instead if it's a
		 * 	comment. For forums, depth = 1 returns its parent, and the depth between thread
		 * 	starter and the comment is 2. So we return the parent & use that node if it's not
		 * 	the starter node
		 * 	since blog comments are akin to forum replies, we don't have to worry about them
		 */
		$closureQry = vB::getDbAssertor()->getRow('vBForum:closure',
			array(	vB_dB_Query::TYPE_KEY => vB_dB_Query::QUERY_SELECT,
					'depth' => 1, 'child' => $nodeid,
					vB_dB_Query::COLUMNS_KEY => array('parent')
			));

		// if the parent is not the starter, it's a comment. Use parent's nodeid to get the page it lives on
		if ( isset($closureQry['parent']) AND ($starter['nodeid'] != $closureQry['parent']) )
		{
			$nodeid = intval($closureQry['parent']);
		}

		if (intval($nodeid) > 0 AND !empty($starter) AND intval($starter['nodeid']) > 0)
		{
			$node = vB_Library::instance('node')->getNodeBare($nodeid);
			if (!empty($node))
			{
				//fetch records that fall between the starter's publishdate and the target node's publishdate
				//sort in asc order so that the last record is the node we're looking for
				//then from that, we can calculate the page number of the target node against the total nodes in the starter
				//it is important to have 'nolimit' to get the correct 'totalpages'
				$searchParams = array(
					'channel'			=> $starter['nodeid'],
					'depth'				=> $depth,
					'include_starter'	=> $include_starter,
					'date'				=> array(
						'from'			=> ($include_starter) ? $starter['publishdate'] : $starter['publishdate'] + 1,
						'to'			=> $node['publishdate'],
					),
					'sort'				=> array(
						'created'		=> 'asc',
					),
					'nolimit'			=> 1,
				);

				// add the $type to the search json
				if (in_array($type, self::$showFilterList))
				{
					$searchParams['type'] = $type;
				}

				$search_json = json_encode($searchParams);
				if ($perpage <= 0 )
				{
					$perpage = 20;
				}

				$results = $this->getInitialResults($search_json, $perpage, 1);
				if (!empty($results) AND $results['totalpages'] > 0)
				{
					$pagenum = 	$results['totalpages'];

					//when sort is desc, the page number should be reversed and should be relative to the actual overall count of nodes in the starter
					if (strtolower($sort) == 'desc')
					{
						$totalrecords = ($depth == 1) ? $starter['textcount_1'] : $starter['totalcount_1']; //_1 means it includes the starter node itself
						$totalpages = ceil($totalrecords/$perpage);
						$searchtotal = $results['totalRecords'];
						$remainder = $totalrecords % $perpage;
						if ($remainder > 0)
						{
							$searchtotal -= $remainder;
							$pagenum = ceil($searchtotal/$perpage) + 1;
						}
						$pagenum = $totalpages - $pagenum + 1;
					}
				}
			}
		}

		return $pagenum;
	}


	/**
	 * Returns the Channel structure
	 * @param bool	flat				(optional) If supplied, the return structure will be flattened
	 * @param array queryOptions		(optional) filters for query. Available values:
	 *					- exclude_categories
	 *					- include_protected
	 * @param bool	skipcache			(optional) If supplied will skip cache & query the DB
	 * @param int 	topLevelChannel		(optional) If supplied will return the structure for the specified top level channel only.
	 *
	 * @return array channel structure
	 */
	public function getChannels(
		$flat = false,
		$queryOptions = array('exclude_categories' => false, 'include_protected' => false),
		$skipcache = false,
		$topLevelChannel = 0
	)
	{
		$no_perm_check = false;

		// admincp needs to display all the channels, regardless of the permissions
		if (!empty($queryOptions['no_perm_check']) AND vB::getUserContext()->hasAdminPermission('canadminpermissions'))
		{
			$no_perm_check = true;
		}

		if ($this->channelCache === null OR $skipcache OR $no_perm_check)
		{
			$rootid = (int) vB_Api::instanceInternal('content_channel')->fetchChannelIdByGUID(vB_Channel::MAIN_CHANNEL);

			$this->channelCache = vB::getDbAssertor()->getRows(
				'vBForum:getChannel',
				array(
					'channel' => $rootid,
					'include_parent'			=> 1,
					'includeProtected'			=> 1,
					'contenttypeid'				=> vB_Types::instance()->getContentTypeId('vBForum_Channel'),
					vB_dB_Query::PARAM_LIMIT	=> vB::getDatastore()->getOption('maxresults'),
					'no_limit'					=> true,
					'no_perm_check'				=> $no_perm_check,
					'sort' => array(
						'parentid'			=> 'asc',
						'displayorder'		=>	'asc'
					)
				)
			);

			foreach($this->channelCache AS $key => $channel)
			{
				unset($this->channelCache[$key]['ipaddress']);
			}
		}

		if (empty($this->channelCache))
		{
			return $this->channelCache;
		}

		if (!empty($queryOptions['exclude_categories']))
		{
			$categoryIds = $channelIds = array();
			foreach($this->channelCache AS $channel)
			{
				$channelIds[] = $channel['nodeid'];
			}
			if (!empty($channelIds))
			{
				$categories = vB::getDbAssertor()->assertQuery('vBForum:channel', array(
					vB_dB_Query::TYPE_KEY => vB_dB_Query::QUERY_SELECT,
					vB_dB_Query::COLUMNS_KEY => array('nodeid'),
					vB_dB_Query::CONDITIONS_KEY => array(
						array('field' => 'nodeid', 'value' => $channelIds),
						array('field' => 'category', 'value' => 1)
					)
				));

				if ($categories)
				{
					foreach($categories AS $category)
					{
						$categoryIds[] = $category['nodeid'];
					}
				}
			}
		}

		if (empty($queryOptions['include_protected']))
		{
			$protectedIds = $channelIds = array();
			foreach($this->channelCache AS $channel)
			{
				$channelIds[] = $channel['nodeid'];
			}
			if (!empty($channelIds))
			{
				$protected = vB::getDbAssertor()->assertQuery('vBForum:node', array(
					vB_dB_Query::TYPE_KEY => vB_dB_Query::QUERY_SELECT,
					vB_dB_Query::COLUMNS_KEY => array('nodeid'),
					vB_dB_Query::CONDITIONS_KEY => array(
						array('field' => 'nodeid', 'value' => $channelIds),
						array('field' => 'protected', 'value' => 1)
					)
				));

				if ($protected)
				{
					foreach($protected as $prot)
					{
						$protectedIds[] = $prot['nodeid'];
					}
				}
			}
		}

		$results = array();
		$resultsTree = array();
		$excluded = array();
		foreach ($this->channelCache AS $channel)
		{
			$channel['displayorder'] = intval($channel['displayorder']);
			if (!empty($queryOptions['exclude_categories']) AND in_array($channel['nodeid'], $categoryIds))
			{
				$excluded[] = $channel['nodeid'];
				continue;
			}
			if (empty($queryOptions['include_protected']) AND in_array($channel['nodeid'], $protectedIds))
			{
				$excluded[] = $channel['nodeid'];
				continue;
			}
			if (!empty($results[$channel['nodeid']]['channels']))
			{
				$channel['channels'] = $results[$channel['nodeid']]['channels'];
			}

			$results[$channel['nodeid']] = $channel;

			if ($channel['depth'] != 0 AND !in_array($channel['parentid'], $excluded))
			{
				$results[$channel['parentid']]['channels'][$channel['nodeid']] = &$results[$channel['nodeid']];
			}
			else
			{
				$resultsTree[$channel['nodeid']] = &$results[$channel['nodeid']];
			}
		}

		if ($topLevelChannel)
		{
			$root = vB_Library::instance('Content_Channel')->getMainChannel();

			if (isset($resultsTree[$root['nodeid']]['channels'][$topLevelChannel]))
			{
				$temp = $resultsTree[$root['nodeid']]['channels'][$topLevelChannel];
				$resultsTree = array();
				$resultsTree[$topLevelChannel] = $temp;
				unset($temp);
			}
			else
			{
				// find the specified $topLevelChannel if it's somewhere deeper in the results tree.
				$temp = $this->getChannelFromTree($resultsTree, $topLevelChannel);
				if ($temp !== null)
				{
					$resultsTree = array();
					$resultsTree[$topLevelChannel] = $temp;
				}
				unset($temp);
			}
		}

		if ($flat)
		{
			return self::flattenTree($resultsTree, 'channels');
		}

		return $resultsTree;
	}

	/**
	 * This takes the channel tree produced by getChannels, finds the specified channel
	 * recursively, then returns that channel's sub tree.  Used internally by getChannels.
	 *
	 * @param	array	Results tree
	 * @param	int	The nodeid to find
	 *
	 * @param	mixed	Subtree array or null if $topLevelChannel was not found.
	 */
	protected function getChannelFromTree($resultsTree, $topLevelChannel)
	{
		foreach ($resultsTree AS $nodeid => $channel)
		{
			if ($nodeid == $topLevelChannel)
			{
				return $channel;
			}
			else if (isset($channel['channels']))
			{
				$temp = $this->getChannelFromTree($channel['channels'], $topLevelChannel);
				if ($temp !== null)
				{
					return $temp;
				}
			}
		}

		return null;
	}

	private function flattenTree($tree, $branchName)
	{
		$leaves = array();
		foreach ($tree as $key => $branches)
		{
			$branch = array();
			if (!empty($branches[$branchName]))
			{
				$branch = $branches[$branchName];
			}
			$leaves[$key] = $branches;
			if (!empty($branch))
			{
				$templeaves = self::flattenTree($branch,$branchName);
				foreach ($templeaves as $index => $leaf)
				{
					$leaves[$index] = $leaf;
				}
			}
		}
		return $leaves;
	}

	public function getForumChannels($flat = false, $queryOptions = array('exclude_categories' => false), $skipcache = false)
	{
		$root = vB_Library::instance('Content_Channel')->getForumHomeChannel();
		return $this->getChannels($flat, $queryOptions, $skipcache, $root['nodeid']);
	}

	public function getSearchableContentTypes()
	{
		return vB_Types::instance()->getSearchableContentTypes();
	}

	private function json2criteria(&$json)
	{
		if (is_string($json))
		{
			$search_structure = json_decode($json, true);

			//$json is inherently utf-8, but our tags are not
			//we'll assume that if it comes in as an array, everything is fine.
			if(isset($search_structure['tag']))
			{
				$search_structure['tag'] = vB::getString()->toDefault($search_structure['tag'], 'utf-8');
			}
		}
		else
		{
			$search_structure = $json;
		}

		if (empty($search_structure) OR !is_array($search_structure))
		{
			throw new vB_Exception_Api('invalid_search_syntax', array($json));
		}

		$criteria = new vB_Search_Criteria();

		$def_sort_field = 'created';
		$def_sort_dir = 'DESC';

		$currentUserId = vB::getCurrentSession()->get('userid');

		$criteria->setUser($currentUserId);

		$normalized_criteria = array();
		if (!empty($search_structure['keywords']))
		{
			$words = $criteria->add_keyword_filter($search_structure['keywords'], !empty($search_structure['title_only']));
			$def_sort_field = 'lastcontent';
			if (!empty($words))
			{
				$normalized_criteria['keywords'] = '';
				$separator = '';
				foreach ($words as $word)
				{
					if (!empty($word['joiner']))
					{
						$normalized_criteria['keywords'] .= $separator . strtoupper($word['joiner']);
						$separator = ' ';
					}
					$normalized_criteria['keywords'] .= $separator . $word['word'];
					$separator = ' ';
				}
				if (!empty($search_structure['title_only']))
				{
					$normalized_criteria['title_only'] = 1;
				}
			}
			else
			{
				$normalized_criteria['error']= 'ignored_search_keywords';
			}
			$ignored_words = $criteria->get_ignored_keywords();
			if (!empty($ignored_words))
			{
				$normalized_criteria['ignored_words'] = $ignored_words;
				$normalized_criteria['original_keywords'] = $search_structure['keywords'];
			}
		}

		// events_during - enhanced calendar feature. Find events with either the startdate or enddate
		// inside the events_during range.
		if (!empty($search_structure['events_during']) AND
			is_array($search_structure['events_during']) AND
			!empty($search_structure['events_during']['from']) AND
			!empty($search_structure['events_during']['to'])
		)
		{
			$vboptions = vB::getDatastore()->getValue('options');
			// Make sure event_max_duration is at least 1 day
			$maxDurationSeconds = max($vboptions['event_max_duration'], 1) * 86400;
			$__rangeStart = $this->computeDateLine($search_structure['events_during']['from']);
			$__rangeEnd = $this->computeDateLine($search_structure['events_during']['to']);

			if ($__rangeStart < $__rangeEnd)
			{
				/*
				(RS - 31 < ES AND RE > ES AND RS < EE AND RE + 31 > EE)

				(
				RS - 31 < ES AND
				RE      > ES AND
				=> RS - 31 < ES < RE
				RS      < EE AND
				RE + 31 > EE
				=> RS < EE < RE + 31
				)
				 */
				$search_structure['eventstartdate'] = array(
					'from' => $__rangeStart - $maxDurationSeconds,
					'to' => $__rangeEnd,
				);
				$search_structure['eventenddate'] = array(
					'from' => $__rangeStart,
					'to' => $__rangeEnd + $maxDurationSeconds,
				);
			}
		}



		// eventenddate. Currently, we only support this in conjunction with eventstartdate for the "events_during"
		// complex filter. If we want to support the simple/single filter & the "future" filters, refactor the eventstartdate
		// code after this block to reduce code duplication.
		if (!empty($search_structure['eventenddate']) AND is_array($search_structure['eventenddate']))
		{
			$__dateline = 0;
			if ( !empty($search_structure['eventenddate']['from']) )
			{
				$__dateline = $this->computeDateLine($search_structure['eventenddate']['from']);
				if(!empty($__dateline))
				{
					$criteria->add_filter('eventenddate', vB_Search_Core::OP_GT, $__dateline);
					$normalized_criteria['eventenddate']['from'] = $search_structure['eventenddate']['from'];
				}
			}

			if ( !empty($search_structure['eventenddate']['to']) )
			{
				$__dateline = $this->computeDateLine($search_structure['eventenddate']['to']);
				if(!empty($__dateline))
				{
					$criteria->add_filter('eventenddate', vB_Search_Core::OP_LT, $__dateline);
					$normalized_criteria['eventenddate']['to'] = $search_structure['eventenddate']['to'];
				}
			}
			unset($__dateline);

			/*
				this filter's processing explicitly filters contenttypeid, so trying to find
				an event type & filter by another (or the same) contenttype makes no sense.
				Unset the contenttypeid filter.
			 */
			unset($search_structure['contenttypeid']);

			// when searching for events, sort them by end date by default. note that if both eventstardate &
			// eventenddate are filtered, the startdate sorting will override enddate sorting.
			$def_sort_field = 'eventstartdate';
			$def_sort_dir = 'ASC';
		}


		// eventstartdate
		if (!empty($search_structure['eventstartdate']))
		{
			$__dateline = 0;
			if (is_array($search_structure['eventstartdate']))
			{
				if ( !empty($search_structure['eventstartdate']['from']) )
				{
					$__dateline = $this->computeDateLine($search_structure['eventstartdate']['from']);
					if(!empty($__dateline))
					{
						$criteria->add_filter('eventstartdate', vB_Search_Core::OP_GT, $__dateline);
						$normalized_criteria['eventstartdate']['from'] = $search_structure['eventstartdate']['from'];
					}
				}

				if ( !empty($search_structure['eventstartdate']['to']) )
				{
					$__dateline = $this->computeDateLine($search_structure['eventstartdate']['to']);
					if(!empty($__dateline))
					{
						$criteria->add_filter('eventstartdate', vB_Search_Core::OP_LT, $__dateline);
						$normalized_criteria['eventstartdate']['to'] = $search_structure['eventstartdate']['to'];
					}
				}
			}
			else if ($search_structure['eventstartdate'] == 'future')
			{
				// convenience method to return all future/upcoming events
				$__dateline = vB::getRequest()->getTimeNow();
				// Note, OP_GT is >=, not >
				$criteria->add_filter('eventstartdate', vB_Search_Core::OP_GT, $__dateline);
				$normalized_criteria['eventstartdate'] = $__dateline;
			}
			else
			{
				$__dateline = intval($search_structure['eventstartdate']);
				if(!empty($__dateline))
				{
					// Note, OP_GT is >=, not >
					$criteria->add_filter('eventstartdate', vB_Search_Core::OP_GT, $__dateline);
					$normalized_criteria['eventstartdate'] = $__dateline;
				}
			}
			unset($__dateline);

			/*
				this filter's processing explicitly filters contenttypeid, so trying to find
				an event type & filter by another (or the same) contenttype makes no sense.
				Unset the contenttypeid filter.
			 */
			unset($search_structure['contenttypeid']);

			// when searching for events, sort them by start date by default
			$def_sort_field = 'eventstartdate';
			$def_sort_dir = 'ASC';
		}

		if (!empty($search_structure['contenttypeid']))
		{
			$search_structure['type'] = vB_Types::instance()->getContentTypeClasses($search_structure['contenttypeid']);
			if (count($search_structure['type']) == 1)
			{
				$search_structure['type'] = array_pop($search_structure['type']);
			}
			unset($search_structure['contenttypeid']);
		}

		if(!empty($search_structure['type']))
		{
			$contentypeids = $criteria->add_contenttype_filter($search_structure['type']);
			$normalized_criteria['type'] = $search_structure['type'];
			$pmcontentypeid = vB_Types::instance()->getContentTypeID('vBForum_PrivateMessage');
			if (in_array($pmcontentypeid, $contentypeids))
			{
				if (count($contentypeids) == 1)
				{
					$search_structure['private_messages_only'] = 1;
				}
				else
				{
					$search_structure['include_private_messages'] = 1;
				}
			}
			$vmcontentypeid = vB_Types::instance()->getContentTypeID('vBForum_VisitorMessage');
			if (in_array($vmcontentypeid, $contentypeids))
			{
				if (count($contentypeids) == 1)
				{
					$search_structure['visitor_messages_only'] = 1;
				}
				else
				{
					$search_structure['include_visitor_messages'] = 1;
				}
			}
			$photocontentypeid = vB_Api::instanceInternal('contenttype')->fetchContentTypeIdFromClass('Photo');
			if (in_array($photocontentypeid, $contentypeids))
			{
				$search_structure['include_attach'] = 1;
			}
		}
		elseif (
				empty($search_structure['exclude_type'])
				OR (is_string($search_structure['exclude_type']) AND $search_structure['exclude_type'] != 'vBForum_PrivateMessage')
				OR (is_array($search_structure['exclude_type']) AND !in_array('vBForum_PrivateMessage',$search_structure['exclude_type']))
			)
		{
			$search_structure['include_private_messages'] = 1;
		}
		elseif(
				!empty($search_structure['exclude_type'])
				AND (
						(is_string($search_structure['exclude_type']) AND $search_structure['exclude_type'] == 'vBForum_VisitorMessage')
						OR (is_array($search_structure['exclude_type']) AND in_array('vBForum_VisitorMessage',$search_structure['exclude_type']))
					)
			)
		{
			$search_structure['exclude_visitor_messages'] = 1;
		}

		if (empty($search_structure['type'])
			AND
			empty($search_structure['exclude_visitor_messages'])
			AND
			(
				empty($search_structure['exclude_type'])
				OR (is_string($search_structure['exclude_type']) AND $search_structure['exclude_type'] != 'vBForum_VisitorMessage')
				OR (is_array($search_structure['exclude_type']) AND !in_array('vBForum_VisitorMessage',$search_structure['exclude_type']))
			)
		)
		{
			$search_structure['include_visitor_messages'] = 1;
		}

		// author by username
		if (!empty($search_structure['author']))
		{
			//reducing users from array to single
			if (is_array($search_structure['author']) AND count($search_structure['author']) == 1)
			{
				$search_structure['author'] = array_pop($search_structure['author']);
				$search_structure['exactname'] = 1;
			}

			// only one username
			if (is_string($search_structure['author']))
			{
				// it's an exact username - no partial match
				if (!empty($search_structure['exactname']))
				{
					$search_structure['author'] = trim($search_structure['author']);
					switch ($search_structure['author'])
					{
						case 'myFriends':
							$userid = array();
							if (!empty($currentUserId))
							{
								$userid = vB::getDbAssertor()->getColumn('userlist', 'relationid',array(
										'userid' => $currentUserId,
										'friend' => 'yes'
									),
									false,
									'relationid'
								);
							}
							if($userid)
							{
								$criteria->add_filter('userid', vB_Search_Core::OP_EQ, $userid, true);
							}
							else
							{
								$criteria->add_null_filter('no friends found');
							}
							break;
						case 'iFollow':
							if (empty($search_structure[self::FILTER_FOLLOW]))
							{
								$search_structure[self::FILTER_FOLLOW] = self::FILTER_FOLLOWING_USERS;
							}
							elseif ($search_structure[self::FILTER_FOLLOW] == self::FILTER_FOLLOWING_CHANNEL)
							{
								$search_structure[self::FILTER_FOLLOW] = self::FILTER_FOLLOWING_BOTH;
							}
							break;
						case 'currentUser':
							$criteria->add_filter('userid', vB_Search_Core::OP_EQ, $currentUserId, true);
							break;
						default:
							$criteria->add_user_filter($search_structure['author'], !empty($search_structure['exactname']));
							break;
					}
					$normalized_criteria['author'] = strtolower($search_structure['author']);
					$normalized_criteria['exactname'] = 1;
				}
				// this is a partial match - need more than 3 chars
				elseif (vb_String::vbStrlen($search_structure['author']) >= 3)
				{
					$criteria->add_user_filter($search_structure['author'], !empty($search_structure['exactname']));
					$normalized_criteria['author'] = strtolower($search_structure['author']);
				}
			}
			// this is a list of usernames
			elseif (is_array($search_structure['author']))
			{
				$user_names = array();
				foreach ($search_structure['author'] as $author)
				{
					$author = vB_String::htmlSpecialCharsUni($author);
					$user = vB_Api::instanceInternal("User")->fetchByUsername($author);
					$userid = false;
					if (!empty($user['userid']))
					{
						$user_ids[] = $user['userid'];
						$user_names[] = $user['username'];
					}
				}
				if (!empty($user_ids))
				{
					$criteria->add_filter('userid', vB_Search_Core::OP_EQ, $user_ids, true);
				}
				else
				{
					$criteria->add_null_filter('no record matches usernames');
				}
				sort($user_names);
				$normalized_criteria['author'] = $user_names;
			}
		}

		// author by userid
		if (!empty($search_structure['authorid']))
		{
			//reducing users from array to single
			if (is_array($search_structure['authorid']) AND count($search_structure['authorid']) == 1)
			{
				$search_structure['authorid'] = array_pop($search_structure['authorid']);
			}

			if (is_numeric($search_structure['authorid']))
			{

				if (!empty($search_structure['visitor_messages_only']))
				{
					$criteria->add_filter('visitor_messages_only', vB_Search_Core::OP_EQ, $search_structure['authorid']);
					$normalized_criteria['visitor_messages_only'] = 1;
				}
				elseif (!empty($search_structure['include_visitor_messages']))
				{
					$criteria->add_filter('include_visitor_messages', vB_Search_Core::OP_EQ, $search_structure['authorid']);
					$normalized_criteria['include_visitor_messages'] = 1;
				}
				else
				{
					$criteria->add_filter('userid', vB_Search_Core::OP_EQ, $search_structure['authorid'], true);
				}

				if (!empty($search_structure['exclude_visitor_messages']))
				{
					$criteria->add_filter('exclude_visitor_messages', vB_Search_Core::OP_EQ, $search_structure['authorid']);
					$normalized_criteria['exclude_visitor_messages'] = 1;
				}

				$normalized_criteria['authorid'] = $search_structure['authorid'];
			}
			elseif (is_array($search_structure['authorid']))
			{
				$user_ids = array();
				foreach ($search_structure['authorid'] as $author)
				{
					if (is_numeric($author))
					{
						$user_ids[] = intval($author);
					}
				}
				$criteria->add_filter('userid', vB_Search_Core::OP_EQ, $user_ids, true);
				sort($user_ids);
				$normalized_criteria['authorid'] = $user_ids;
			}
		}
		else if (!empty($search_structure['exclude_visitor_messages']))
		{
			$criteria->add_filter('exclude_visitor_messages', vB_Search_Core::OP_EQ, 0);
			$normalized_criteria['exclude_visitor_messages'] = 1;
		}

		if(!empty($search_structure['trending']))
		{
			$criteria->add_filter('trending',  vB_Search_Core::OP_EQ, 1);
			$normalized_criteria['trending'] = 1;
		}

		// channel owner filter
		if (!empty($search_structure['my_channels']))
		{
			$temp = array();
			// restrict 'type' to string 'blog' or 'group', else default to 'blog'
			if (isset($search_structure['my_channels']['type'])
				AND (
					$search_structure['my_channels']['type'] == 'blog' OR
					$search_structure['my_channels']['type'] == 'group'
				)
			)
			{
				$temp['type'] = $search_structure['my_channels']['type'];
			}
			else
			{
				$temp['type'] = 'blog';
			}

			$normalized_criteria['my_channels'] = $temp;
			$criteria->add_filter('my_channels', vB_Search_Core::OP_EQ, $temp);
			unset($temp);
		}


		if (!empty($search_structure['private_messages_only']))
		{
			$criteria->add_filter('private_messages_only', vB_Search_Core::OP_EQ, $currentUserId);
			$normalized_criteria['private_messages_only'] = 1;
		}

		// visitor message recipient
		if (!empty($search_structure['sentto']))
		{
			//reducing users from array to single
			if (is_array($search_structure['sentto']) AND count($search_structure['sentto']) == 1)
			{
				$search_structure['sentto'] = array_pop($search_structure['sentto']);
			}

			if (is_numeric($search_structure['sentto']))
			{
				$criteria->add_filter('sentto', vB_Search_Core::OP_EQ, intval($search_structure['sentto']));
				$normalized_criteria['visitor_messages_only'] = 1;
				$normalized_criteria['sentto'] = intval($search_structure['sentto']);
			}
			elseif (is_array($search_structure['sentto']))
			{
				$user_ids = array_map('intval', $search_structure['sentto']);
				sort($user_ids);
				$criteria->add_filter('sentto', vB_Search_Core::OP_EQ, $user_ids);
				$normalized_criteria['visitor_messages_only'] = 1;
				$normalized_criteria['sentto'] = $user_ids;
			}
		}

		if (!empty($search_structure['tag']))
		{

			if (is_array($search_structure['tag']))
			{
				foreach ($search_structure['tag'] AS $index => $tag)
				{
					$search_structure['tag'][$index] = vB_String::htmlSpecialCharsUni(trim($tag));
				}
			}
			else
			{
				$search_structure['tag'] = vB_String::htmlSpecialCharsUni(trim($search_structure['tag']));
			}
			$existing_tags = $criteria->add_tag_filter($search_structure['tag']);
			$normalized_criteria['tag'] = array_keys($existing_tags);
			vB_Api::instanceInternal('Tags')->logSearchTags($existing_tags);
		}

		if (!empty($search_structure['date']))
		{
			if ($search_structure['date'] == self::FILTER_LASTVISIT)
			{
				$current_user = vB::getCurrentSession()->fetch_userinfo();
				$dateline = $current_user['lastvisit'];

				if(empty($dateline))
				{
					$dateline = vB::getRequest()->getTimeNow() - (86400 * 14);
				}
				$criteria->add_date_filter(vB_Search_Core::OP_GT, $dateline);
				$normalized_criteria['date'] = self::FILTER_LASTVISIT;
			}
			if ($search_structure['date'] == self::FILTER_TOPICAGE)
			{
				$age = vB::getDatastore()->getOption('max_age_topic');
				if ((intval($age) == 0) )
				{
					$age = 60;
				}
				$criteria->add_date_filter(vB_Search_Core::OP_GT, vB::getRequest()->getTimeNow() - (86400 * $age));
				$normalized_criteria['date'] = self::FILTER_TOPICAGE;
			}
			if ($search_structure['date'] == self::FILTER_CHANNELAGE)
			{
				$age = vB::getDatastore()->getOption('max_age_channel');
				if ((intval($age) == 0) )
				{
					$age = 60;
				}
				$criteria->add_date_filter(vB_Search_Core::OP_GT, vB::getRequest()->getTimeNow() - (86400 * $age));
				$normalized_criteria['date'] = self::FILTER_CHANNELAGE;
			}

			// forcing to get the whole date spectrum; activity stream view enforces a date range so this is the workaround
			if (!empty($search_structure['date']) AND is_string($search_structure['date']) AND $search_structure['date'] == self::FILTER_DATEALL)
			{
				$criteria->add_date_filter(vB_Search_Core::OP_EQ, self::FILTER_DATEALL);
				$normalized_criteria['date'] = self::FILTER_DATEALL;
			}

			if (is_array($search_structure['date']) AND !empty($search_structure['date']['from']))
			{
				$dateline = $this->computeDateLine($search_structure['date']['from']);
				if(!empty($dateline))
				{
					$criteria->add_date_filter(vB_Search_Core::OP_GT, $dateline);
					$normalized_criteria['date']['from'] = $search_structure['date']['from'];
				}
			}

			if (is_array($search_structure['date']) AND !empty($search_structure['date']['to']))
			{
				$dateline = $this->computeDateLine($search_structure['date']['to'], true);
				if(!empty($dateline))
				{
					$criteria->add_date_filter(vB_Search_Core::OP_LT, $dateline);
					$normalized_criteria['date']['to'] = $search_structure['date']['to'];
				}
			}
		}

		if (!empty($search_structure['last']))
		{

			if (is_array($search_structure['last']) AND !empty($search_structure['last']['from']))
			{
				$dateline = $this->computeDateLine($search_structure['last']['from']);
				if(!empty($dateline))
				{
					$criteria->add_last_filter(vB_Search_Core::OP_GT, $dateline);
					$normalized_criteria['last']['from'] = $search_structure['last']['from'];
				}
			}


			if (is_array($search_structure['last']) AND !empty($search_structure['last']['to']))
			{
				$dateline = $this->computeDateLine($search_structure['last']['to'], true);
				if(!empty($dateline))
				{
					$criteria->add_last_filter(vB_Search_Core::OP_LT, $dateline);
					$normalized_criteria['last']['to'] = $search_structure['last']['to'];
				}
			}
		}

		if (!empty($search_structure['exclude']))
		{
			$criteria->add_exclude_filter($search_structure['exclude']);
			$normalized_criteria['exclude'] = $search_structure['exclude'];
		}

		// ----- Sort order -----

		if (empty($search_structure['sort']))
		{
			$search_structure['sort'] = array($def_sort_field => $def_sort_dir);
		}

		if (!is_array($search_structure['sort']))
		{
			$sort_dir = $def_sort_dir;
			if (strtolower($search_structure['sort']) == 'title')
			{
				$sort_dir = 'ASC';
			}
			$search_structure['sort'] = array($search_structure['sort'] => $sort_dir);
		}

		foreach ($search_structure['sort'] as $sort_field => $sort_dir)
		{
			$criteria->set_sort($sort_field, strtoupper($sort_dir));
		}

		if ($sort_field != $def_sort_field OR $sort_dir != $def_sort_dir)
		{
			$normalized_criteria['sort'] = array($sort_field => strtoupper($sort_dir));
		}

		// ----- View / display -----

		if (!empty($search_structure['view']))
		{
			if ($search_structure['view'] == vB_Api_Search::FILTER_VIEW_CONVERSATION_STREAM AND !empty($search_structure['channel']))
			{
				$search_structure['depth'] = 2;
				$search_structure['include_starter'] = true;
			}
			elseif ($search_structure['view'] == vB_Api_Search::FILTER_VIEW_CONVERSATION_THREAD AND !empty($search_structure['channel']))
			{
				$search_structure['depth'] = 1;
				$search_structure['include_starter'] = true;
			}
			else
			{
				$criteria->add_view_filter($search_structure['view']);
				$normalized_criteria['view'] = $search_structure['view'];
			}
		}

		if (!empty($search_structure['starter_only']))
		{
			$criteria->add_filter('starter_only', vB_Search_Core::OP_EQ, true);
			$search_structure['include_starter'] = true;
			$normalized_criteria['starter_only'] = 1;
		}

		if (!empty($search_structure['reply_only']))
		{
			$criteria->add_filter('reply_only', vB_Search_Core::OP_EQ, true);
			$search_structure['include_starter'] = false;
			$normalized_criteria['reply_only'] = 1;
		}

		if (!empty($search_structure['comment_only']))
		{
			$criteria->add_filter('comment_only', vB_Search_Core::OP_EQ, true);
			$search_structure['include_starter'] = false;
			$normalized_criteria['comment_only'] = 1;
		}

		// this is kind of tacky, but let's just hook into the existing channel search by converting the GUID to channelid.
		if (!empty($search_structure['channelguid']))
		{
			$channel = vB_Library::instance('content_channel')->fetchChannelByGUID($search_structure['channelguid']);
			if (!empty($channel['nodeid']))
			{
				$search_structure['channel'] = $channel['nodeid'];
			}
		}


		if (!empty($search_structure['channel']))
		{
			$criteria->add_channel_filter(
					$search_structure['channel'],
					empty($search_structure['depth']) ? false : $search_structure['depth'],
					empty($search_structure['include_starter']) ? false : true,
					empty($search_structure['depth_exact']) ? false : true
			);

			$normalized_criteria['channel'] = $search_structure['channel'];

			if (!empty($search_structure['depth']))
			{
				$normalized_criteria['depth'] = $search_structure['depth'];
			}

			if (!empty($search_structure['depth_exact']))
			{
				$normalized_criteria['depth_exact'] = true;
			}

			if (!empty($search_structure['include_starter']))
			{
				$normalized_criteria['include_starter'] = 1;
			}
		}

		if (!empty($search_structure['featured']))
		{
			$criteria->add_filter('featured', vB_Search_Core::OP_EQ, $search_structure['featured']);
			$normalized_criteria['featured'] = 1;
		}

		if (!empty($search_structure[self::FILTER_FOLLOW]))
		{
			if (is_string($search_structure[self::FILTER_FOLLOW]) AND !empty($currentUserId))
			{
				$criteria->add_follow_filter($search_structure[self::FILTER_FOLLOW], $currentUserId);
				$normalized_criteria[self::FILTER_FOLLOW] = $search_structure[self::FILTER_FOLLOW];
			}
			elseif (is_array($search_structure[self::FILTER_FOLLOW]))
			{
				$userid = reset($search_structure[self::FILTER_FOLLOW]);
				$type = key($search_structure[self::FILTER_FOLLOW]);
				$criteria->add_follow_filter($type, $userid);
				$normalized_criteria[self::FILTER_FOLLOW] = $search_structure[self::FILTER_FOLLOW];
			}
		}

		if (!empty($search_structure['my_following']) AND !empty($currentUserId))
		{
			$criteria->add_follow_filter(self::FILTER_FOLLOWING_CHANNEL, $currentUserId);
			$normalized_criteria['my_following'] = $search_structure['my_following'];
		}

		if (!empty($search_structure['exclude_type']))
		{
			$criteria->add_contenttype_filter($search_structure['exclude_type'], vB_Search_Core::OP_NEQ);
			$normalized_criteria['exclude_type'] = $search_structure['exclude_type'];
		}

		if (!empty($search_structure['sticky_only']))
		{
			$criteria->add_filter('sticky', vB_Search_Core::OP_EQ, '1');
			$normalized_criteria['sticky_only'] = 1;
		}

		if (!empty($search_structure['exclude_sticky']))
		{
			$criteria->add_filter('sticky', vB_Search_Core::OP_NEQ, '1');
			$normalized_criteria['exclude_sticky'] = 1;
		}

		if (!empty($search_structure['include_sticky']))
		{
			$criteria->set_include_sticky();
			$normalized_criteria['include_sticky'] = 1;
		}

		if (empty($search_structure['include_blocked']) OR empty($currentUserId) OR !vB::getUserContext()->hasPermission('moderatorpermissions', 'canbanusers'))
		{
			//block people on the global ignore list.
			$globalignore = trim(vB::getDatastore()->getOption('globalignore'));
			if (!empty($globalignore))
			{
				$blocked = preg_split('#\s+#s', $globalignore, -1, PREG_SPLIT_NO_EMPTY);
				//the user can always see their own posts, so if they are in the blocked list we remove them
				if (!empty($currentUserId))
				{
					$bbuserkey = array_search($currentUserId , $blocked);

					if ($bbuserkey !== FALSE AND $bbuserkey !== NULL)
					{
						unset($blocked["$bbuserkey"]);
					}
				}
				//Make sure we didn't just empty the list
				if (!empty($blocked))
				{
					$criteria->add_filter('userid', vB_Search_Core::OP_NEQ, $blocked, false, true);
				}
			}
		}
		elseif (!empty($currentUserId) AND vB::getUserContext()->hasPermission('moderatorpermissions', 'canbanusers'))
		{
			$normalized_criteria['include_blocked'] = 1;
		}

		if (empty($search_structure['include_blocked']) AND !empty($currentUserId))
		{
			$currentUserInfo = vB_User::fetchUserinfo($currentUserId);
			if (!empty($currentUserInfo['ignorelist']))
			{
				$criteria->add_filter('userid', vB_Search_Core::OP_NEQ, explode(' ', $currentUserInfo['ignorelist']), false, true);
			}
		}

		if (!empty($search_structure['ignore_protected']))
		{
			$criteria->add_filter('protected', vB_Search_Core::OP_NEQ, '1');
			$normalized_criteria['ignore_protected'] = 1;
		}

		if (!empty($search_structure['deleted_only']) AND !empty($currentUserId) AND vB::getUserContext()->hasPermission('moderatorpermissions', 'canremoveposts'))
		{
			$criteria->add_filter('showpublished', vB_Search_Core::OP_EQ, '0');
			$criteria->add_filter('deleteuserid', vB_Search_Core::OP_NEQ, '0');
			$normalized_criteria['deleted_only'] = 1;
		}

		if (!empty($search_structure['exclude_deleted']))
		{
			$criteria->add_filter('showpublished', vB_Search_Core::OP_EQ, '1');
			$normalized_criteria['exclude_deleted'] = 1;
		}


		if (empty($search_structure['include_attach']))
		{
			$criteria->add_filter('inlist', vB_Search_Core::OP_EQ, 1);
		}
		else
		{
			$normalized_criteria['include_attach'] = 1;
		}

		if (!empty($search_structure['unapproved_only']) AND !empty($currentUserId) AND vB::getUserContext()->hasPermission('moderatorpermissions', 'canmanagethreads'))
		{
			$criteria->add_filter('approved', vB_Search_Core::OP_NEQ, '1');
			$normalized_criteria['unapproved_only'] = 1;
		}
		if (!empty($search_structure['unread_only']) AND !empty($currentUserId) AND vB::getDatastore()->getOption('threadmarking') > 0)
		{
			$criteria->add_filter('marked', vB_Search_Core::OP_EQ, self::FILTER_MARKED_UNREAD);
			$normalized_criteria['unread_only'] = 1;
		}

		if (!empty($search_structure['specific']))
		{
			$criteria->add_filter('nodeid', vB_Search_Core::OP_EQ, $search_structure['specific']);
			$normalized_criteria['specific'] = $search_structure['specific'];
		}

		if (!empty($search_structure['prefix']))
		{
			$normalized_criteria['prefix'] = $search_structure['prefix'];
			$criteria->add_filter('prefixid', vB_Search_Core::OP_EQ, $search_structure['prefix']);
		}

		if (!empty($search_structure['has_prefix']))
		{
			$normalized_criteria['has_prefix'] = 1;
			$criteria->add_filter('prefixid', vB_Search_Core::OP_NEQ, '');
		}

		if (!empty($search_structure['no_prefix']))
		{
			$normalized_criteria['no_prefix'] = 0;
			$criteria->add_filter('prefixid', vB_Search_Core::OP_EQ, '');
		}

		// private messages are included by default. Use the exclude_type filter to exlude them
		// they are not included if a specific channel is requested OR looking for visitor messages
		if (
				!empty($search_structure['include_private_messages'])
				AND empty($normalized_criteria['private_messages_only'])
				AND empty($normalized_criteria['sentto'])
				AND (
						empty($normalized_criteria['channel'])
						OR (
								is_numeric($normalized_criteria['channel'])
								AND !in_array($normalized_criteria['channel'], array(vB_Channel::MAIN_CHANNEL, vB_Channel::DEFAULT_CHANNEL_PARENT, vB_Channel::PRIVATEMESSAGE_CHANNEL))
						)
						OR (
								is_array($normalized_criteria['channel'])
								AND count(array_intersect($normalized_criteria['channel'], array(vB_Channel::MAIN_CHANNEL, vB_Channel::DEFAULT_CHANNEL_PARENT, vB_Channel::PRIVATEMESSAGE_CHANNEL))) == 0
						)
				)
				AND empty($normalized_criteria['my_channels'])
		)
		{
			$criteria->add_filter('include_private_messages', vB_Search_Core::OP_EQ, $currentUserId);
		}

		if (
				!empty($search_structure['nolimit'])
				AND !empty($normalized_criteria['channel'])
				AND (empty($normalized_criteria['view']) OR $normalized_criteria['view'] != self::FILTER_VIEW_ACTIVITY)
				AND empty($search_structure['author'])
				AND empty($search_structure['authorid'])
				AND empty($search_structure['keywords'])
				AND empty($search_structure['sentto'])
				AND empty($search_structure['private_messages_only'])
				AND empty($search_structure['tag'])
				AND empty($search_structure['featured'])
				AND empty($search_structure['my_following'])
				AND empty($search_structure['unapproved_only'])
				AND empty($search_structure['unread_only'])
			)
		{
			$normalized_criteria['nolimit'] = 1;
			$criteria->setNoLimit();
		}

		// Two pass caching can be disabled by either ignore_cache which
		// also disabled the searchlog table or by specifying 'disable_two_pass'
		// Two pass caching can be forced on when 'ignore_cache' has been called
		// by specifying 'force_two_pass' (for unit testing the two pass cache functionality itself)

		if (!empty($search_structure['ignore_cache']) OR self::IGNORE_CACHE)
		{
			$normalized_criteria['disable_two_pass'] = 1;
			$criteria->setIgnoreCache(true);
		}

		if (!empty($search_structure['disable_two_pass']))
		{
			$normalized_criteria['disable_two_pass'] = 1;
		}

		if (!empty($search_structure['force_two_pass']) AND !empty($normalized_criteria['disable_two_pass']))
		{
			unset($normalized_criteria['disable_two_pass']);
		}

		//checking for a restrictive filter
		if (
				empty($normalized_criteria['keywords'])
				AND empty($normalized_criteria['authorid'])
				AND empty($normalized_criteria['author'])
				AND empty($normalized_criteria['private_messages_only'])
				AND empty($normalized_criteria['visitor_messages_only'])
				AND empty($normalized_criteria['sentto'])
				AND empty($normalized_criteria['tag'])
				AND (empty($normalized_criteria['date']) OR (is_string($normalized_criteria['date']) AND $normalized_criteria['date'] == self::FILTER_DATEALL))
				AND (empty($normalized_criteria['last']) OR (is_string($normalized_criteria['last']) AND $normalized_criteria['last'] == self::FILTER_DATEALL))
				AND empty($normalized_criteria['channel'])
				AND empty($normalized_criteria['featured'])
				AND empty($normalized_criteria[self::FILTER_FOLLOW])
				AND empty($normalized_criteria['my_following'])
				AND empty($normalized_criteria['sticky_only'])
				AND empty($normalized_criteria['deleted_only'])
				AND empty($normalized_criteria['unapproved_only'])
				AND empty($normalized_criteria['unread_only'])
				AND empty($normalized_criteria['specific'])
				AND empty($normalized_criteria['prefix'])
				AND empty($normalized_criteria['has_prefix'])
				AND empty($normalized_criteria['no_prefix'])
				AND empty($normalized_criteria['my_channels'])
				AND empty($normalized_criteria['eventstartdate'])
		)
		{
			//temporary solution for VBV-10061
			if ($normalized_criteria['view'] == self::FILTER_VIEW_ACTIVITY)
			{
				$dateline = $this->computeDateLine(self::FILTER_LASTMONTH);
				if(!empty($dateline))
				{
					$criteria->add_date_filter(vB_Search_Core::OP_GT, $dateline);
				}
			}
			else
			//end of temporary solution
			{
				throw new vB_Exception_Api('criteria_not_restrictive', array($normalized_criteria));
			}
		}
		$criteria->setJSON($normalized_criteria);
		$json = $normalized_criteria;
		// allow the clients to send custom fields that will be preserved
		if (!empty($search_structure['custom']))
		{
			$json['custom'] = $search_structure['custom'];
		}

		return $criteria;
	}

	private function computeDateLine($date, $round_to_eod = false)
	{
		$dateline = false;
		$timeNow = vB::getRequest()->getTimeNow();
		if (is_numeric($date))
		{
			if($date >= 100000000)//unix timestamp
			{
				$dateline = $date;
			}
			else
			{
				$dateline = $timeNow - ($date * 86400); //24 x 60 x 60 = 1 day
			}
		}
		elseif (is_string($date))
		{
			switch ($date){
				case self::FILTER_LASTDAY :
					$dateline = $timeNow - 86400; //24 x 60 x 60 = 1 day
				break;
				case self::FILTER_LASTWEEK :
					$dateline = $timeNow - 604800; //7 x 24 x 60 x 60 = 7 days
				break;
				case self::FILTER_LASTMONTH :
					$dateline = strtotime('-1 month', $timeNow);
				break;
				case self::FILTER_LASTYEAR :
					$dateline = strtotime('-1 year', $timeNow);
				break;
				default:
					if ($parseddate = strtotime($date))
					{
						if ($round_to_eod)
						{
							$h = date('G', $parseddate);
							$m = intval(date('i', $parseddate));
							$s = intval(date('s', $parseddate));
							if (empty($h) AND empty($m) AND empty($s))
							{
								$parseddate += 86399; // end of the day
							}
						}
						$dateline = $parseddate;
					}
				break;
			}
		}
		return $dateline;
	}

	public static function is_index_word($word, $isLower = false)
	{
		$badwords = self::get_all_bad_words();
		$goodwords = self::get_good_words();

		if (!$isLower)
		{
			$word = vB_String::vBStrToLower($word);
		}
		// is the word in the goodwords array?
		if (in_array($word, $goodwords))
		{
			return 1;
		}
		else
		{
			// is the word outside the min/max char lengths for indexing?
			$wordlength = vB_String::vbStrlen($word);
			$options = vB::getDatastore()->get_value('options');
			if ($wordlength < $options['minsearchlength'] OR $wordlength > $options['maxsearchlength'])
			{
				return 0;
			}
			// is the word a common/bad word?
			else if (in_array($word, $badwords))
			{
				return false;
			}
			// word is good
			else
			{
				return 1;
			}
		}
	}

	public static function get_good_words()
	{
		if (!isset(self::$goodwords))
		{
			$options = vB::getDatastore()->get_value('options');
			$goodwords = trim($options['goodwords']);
			if (!empty($goodwords))
			{
				self::$goodwords = preg_split('#[ \r\n\t]+#s', strtolower($goodwords), -1, PREG_SPLIT_NO_EMPTY);
			}
			else
			{
				self::$goodwords = array();
			}
		}
		return self::$goodwords;
	}

	public static function get_all_bad_words()
	{
		if (!isset(self::$allbadwords))
		{
			$options = vB::getDatastore()->get_value('options');
			self::$allbadwords = array_merge(self::get_bad_words(), preg_split('/\s+/s', $options['badwords'], -1, PREG_SPLIT_NO_EMPTY));
		}
		return self::$allbadwords;
	}

	public static function get_bad_words()
	{
		if (!isset(self::$badwords))
		{
			$badwords = array(
				'&amp',
				'&quot',
				'a',
				'able',
				'about',
				'above',
				'according',
				'accordingly',
				'across',
				'actually',
				'after',
				'afterwards',
				'again',
				'against',
				'aint',
				'all',
				'allow',
				'allows',
				'almost',
				'alone',
				'along',
				'already',
				'also',
				'although',
				'always',
				'am',
				'among',
				'amongst',
				'an',
				'and',
				'another',
				'any',
				'anybody',
				'anyhow',
				'anyone',
				'anything',
				'anyway',
				'anyways',
				'anywhere',
				'apart',
				'appear',
				'appreciate',
				'appropriate',
				'are',
				'arent',
				'around',
				'as',
				'aside',
				'ask',
				'asking',
				'associated',
				'at',
				'available',
				'away',
				'awfully',
				'b',
				'be',
				'became',
				'because',
				'become',
				'becomes',
				'becoming',
				'been',
				'before',
				'beforehand',
				'behind',
				'being',
				'believe',
				'below',
				'beside',
				'besides',
				'best',
				'better',
				'between',
				'beyond',
				'both',
				'brief',
				'but',
				'by',
				'c',
				'came',
				'can',
				'cannot',
				'cant',
				'cause',
				'causes',
				'certain',
				'certainly',
				'changes',
				'clearly',
				'cmon',
				'co',
				'com',
				'come',
				'comes',
				'concerning',
				'consequently',
				'consider',
				'considering',
				'contain',
				'containing',
				'contains',
				'corresponding',
				'could',
				'couldnt',
				'course',
				'cs',
				'currently',
				'd',
				'definitely',
				'described',
				'despite',
				'did',
				'didnt',
				'different',
				'do',
				'does',
				'doesnt',
				'doing',
				'done',
				'dont',
				'down',
				'downwards',
				'during',
				'e',
				'each',
				'edu',
				'eg',
				'eight',
				'either',
				'else',
				'elsewhere',
				'enough',
				'entirely',
				'especially',
				'et',
				'etc',
				'even',
				'ever',
				'every',
				'everybody',
				'everyone',
				'everything',
				'everywhere',
				'ex',
				'exactly',
				'example',
				'except',
				'f',
				'far',
				'few',
				'fifth',
				'first',
				'five',
				'followed',
				'following',
				'follows',
				'for',
				'former',
				'formerly',
				'forth',
				'four',
				'from',
				'further',
				'furthermore',
				'g',
				'get',
				'gets',
				'getting',
				'given',
				'gives',
				'go',
				'goes',
				'going',
				'gone',
				'got',
				'gotten',
				'greetings',
				'h',
				'had',
				'hadnt',
				'happens',
				'hardly',
				'has',
				'hasnt',
				'have',
				'havent',
				'having',
				'he',
				'hello',
				'help',
				'hence',
				'her',
				'here',
				'heres',
				'hereafter',
				'hereby',
				'herein',
				'hereupon',
				'hers',
				'herself',
				'hes',
				'hi',
				'him',
				'himself',
				'his',
				'hither',
				'hopefully',
				'how',
				'howbeit',
				'however',
				'i',
				'id',
				'ie',
				'if',
				'ignored',
				'ill',
				'im',
				'immediate',
				'in',
				'inasmuch',
				'inc',
				'indeed',
				'indicate',
				'indicated',
				'indicates',
				'inner',
				'insofar',
				'instead',
				'into',
				'inward',
				'is',
				'isnt',
				'ist',
				'it',
				'itd',
				'itll',
				'its',
				'itself',
				'ive',
				'j',
				'just',
				'k',
				'keep',
				'keeps',
				'kept',
				'know',
				'knows',
				'known',
				'l',
				'last',
				'lately',
				'later',
				'latter',
				'latterly',
				'least',
				'less',
				'lest',
				'let',
				'lets',
				'like',
				'liked',
				'likely',
				'little',
				'look',
				'looking',
				'looks',
				'ltd',
				'm',
				'mainly',
				'many',
				'may',
				'maybe',
				'me',
				'mean',
				'meanwhile',
				'merely',
				'might',
				'more',
				'moreover',
				'most',
				'mostly',
				'much',
				'must',
				'my',
				'myself',
				'n',
				'name',
				'namely',
				'nd',
				'near',
				'nearly',
				'necessary',
				'need',
				'needs',
				'neither',
				'never',
				'nevertheless',
				'new',
				'next',
				'nine',
				'no',
				'nobody',
				'non',
				'none',
				'noone',
				'nor',
				'normally',
				'not',
				'nothing',
				'novel',
				'now',
				'nowhere',
				'o',
				'obviously',
				'of',
				'off',
				'often',
				'oh',
				'ok',
				'okay',
				'old',
				'on',
				'once',
				'one',
				'ones',
				'only',
				'onto',
				'or',
				'originally',
				'other',
				'others',
				'otherwise',
				'ought',
				'our',
				'ours',
				'ourselves',
				'out',
				'outside',
				'over',
				'overall',
				'own',
				'p',
				'particular',
				'particularly',
				'per',
				'perhaps',
				'placed',
				'please',
				'plus',
				'possible',
				'posted',
				'presumably',
				'probably',
				'provides',
				'q',
				'que',
				'quite',
				'quote',
				'qv',
				'r',
				'rather',
				'rd',
				're',
				'really',
				'reasonably',
				'regarding',
				'regardless',
				'regards',
				'relatively',
				'respectively',
				'right',
				's',
				'said',
				'same',
				'saw',
				'say',
				'saying',
				'says',
				'second',
				'secondly',
				'see',
				'seeing',
				'seem',
				'seemed',
				'seeming',
				'seems',
				'seen',
				'self',
				'selves',
				'sensible',
				'sent',
				'seriously',
				'seven',
				'several',
				'shall',
				'she',
				'should',
				'shouldnt',
				'since',
				'six',
				'so',
				'some',
				'somebody',
				'somehow',
				'someone',
				'something',
				'sometime',
				'sometimes',
				'somewhat',
				'somewhere',
				'soon',
				'sorry',
				'specified',
				'specify',
				'specifying',
				'still',
				'sub',
				'such',
				'sup',
				'sure',
				't',
				'take',
				'taken',
				'tell',
				'tends',
				'th',
				'than',
				'thank',
				'thanks',
				'thanx',
				'that',
				'thats',
				'the',
				'their',
				'theirs',
				'them',
				'themselves',
				'then',
				'thence',
				'there',
				'theres',
				'thereafter',
				'thereby',
				'therefore',
				'therein',
				'theres',
				'thereupon',
				'these',
				'they',
				'theyd',
				'theyll',
				'theyre',
				'theyve',
				'think',
				'third',
				'this',
				'thorough',
				'thoroughly',
				'those',
				'though',
				'three',
				'through',
				'throughout',
				'thru',
				'thus',
				'to',
				'together',
				'too',
				'took',
				'toward',
				'towards',
				'tried',
				'tries',
				'truly',
				'try',
				'trying',
				'ts',
				'twice',
				'two',
				'u',
				'un',
				'under',
				'unfortunately',
				'unless',
				'unlikely',
				'until',
				'unto',
				'up',
				'upon',
				'us',
				'use',
				'used',
				'useful',
				'uses',
				'using',
				'usually',
				'v',
				'value',
				'various',
				'very',
				'via',
				'viz',
				'vs',
				'w',
				'want',
				'wants',
				'was',
				'wasnt',
				'way',
				'we',
				'wed',
				'welcome',
				'well',
				'went',
				'were',
				'weve',
				'werent',
				'what',
				'whats',
				'whatever',
				'when',
				'whence',
				'whenever',
				'where',
				'whereafter',
				'whereas',
				'whereby',
				'wherein',
				'whereupon',
				'wherever',
				'wheres',
				'whether',
				'which',
				'while',
				'whither',
				'who',
				'whoever',
				'whole',
				'whom',
				'whos',
				'whose',
				'why',
				'will',
				'willing',
				'wish',
				'with',
				'within',
				'without',
				'wonder',
				'wont',
				'would',
				'would',
				'wouldnt',
				'x',
				'y',
				'yes',
				'yet',
				'you',
				'youd',
				'youll',
				'your',
				'youre',
				'yours',
				'yourself',
				'yourselves',
				'youve',
				'z',
				'zero'
			);
			// Legacy Hook 'search_stopwords' Removed //
			self::$badwords = $badwords;
		}
		return self::$badwords;
	}
}

/*=========================================================================*\
|| #######################################################################
|| # Downloaded: 10:32, Fri Feb 2nd 2018
|| # CVS: $RCSfile$ - $Revision: 96330 $
|| #######################################################################
\*=========================================================================*/
