<?php
/***************************************************************
 *  Copyright notice
 *
 *  (c) 2010-2011 Workspaces Team (http://forge.typo3.org/projects/show/typo3v4-workspaces)
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
 *  free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *  A copy is found in the textfile GPL.txt and important notices to the license
 *  from the author is found in LICENSE.txt distributed with these scripts.
 *
 *
 *  This script is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/

/**
 * @author Workspaces Team (http://forge.typo3.org/projects/show/typo3v4-workspaces)
 * @package Workspaces
 * @subpackage Service
 */
class Tx_Workspaces_Service_Workspaces implements t3lib_Singleton {
	/**
	 * @var array
	 */
	protected $pageCache = array();

	const TABLE_WORKSPACE = 'sys_workspace';
	const SELECT_ALL_WORKSPACES = -98;
	const LIVE_WORKSPACE_ID = 0;

	/**
	 * retrieves the available workspaces from the database and checks whether
	 * they're available to the current BE user
	 *
	 * @return	array	array of worspaces available to the current user
	 */
	public function getAvailableWorkspaces() {
		$availableWorkspaces = array();

			// add default workspaces
		if ($GLOBALS['BE_USER']->checkWorkspace(array('uid' => (string) self::LIVE_WORKSPACE_ID))) {
			$availableWorkspaces[self::LIVE_WORKSPACE_ID] = self::getWorkspaceTitle(self::LIVE_WORKSPACE_ID);
		}

			// add custom workspaces (selecting all, filtering by BE_USER check):
		$customWorkspaces = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows('uid, title, adminusers, members', 'sys_workspace', 'pid = 0' . t3lib_BEfunc::deleteClause('sys_workspace'), '', 'title');
		if (count($customWorkspaces)) {
			foreach ($customWorkspaces as $workspace) {
				if ($GLOBALS['BE_USER']->checkWorkspace($workspace)) {
					$availableWorkspaces[$workspace['uid']] = htmlspecialchars($workspace['title']);
				}
			}
		}

		return $availableWorkspaces;
	}

	/**
	 * Gets the current workspace ID.
	 *
	 * @return integer The current workspace ID
	 */
	public function getCurrentWorkspace() {
		$workspaceId = $GLOBALS['BE_USER']->workspace;
		if ($GLOBALS['BE_USER']->isAdmin()) {
			$activeId = $GLOBALS['BE_USER']->getSessionData('tx_workspace_activeWorkspace');
			$workspaceId = $activeId !== NULL ? $activeId : $workspaceId;
		}
		return $workspaceId;
	}

	/**
	 * Find the title for the requested workspace.
	 *
	 * @param integer $wsId
	 * @return string
	 */
	public static function getWorkspaceTitle($wsId) {
		$title = FALSE;
		switch ($wsId) {
			case self::LIVE_WORKSPACE_ID:
				$title = $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_misc.xml:shortcut_onlineWS');
				break;
			default:
				$labelField = $GLOBALS['TCA']['sys_workspace']['ctrl']['label'];
				$wsRecord = t3lib_beFunc::getRecord('sys_workspace', $wsId, 'uid,' . $labelField);
				if (is_array($wsRecord)) {
					$title = $wsRecord[$labelField];
				}
		}

		if ($title === FALSE) {
			throw new InvalidArgumentException('No such workspace defined');
		}

		return $title;
	}


	/**
	 * Building tcemain CMD-array for swapping all versions in a workspace.
	 *
	 * @param	integer		Real workspace ID, cannot be ONLINE (zero).
	 * @param	boolean		If set, then the currently online versions are swapped into the workspace in exchange for the offline versions. Otherwise the workspace is emptied.
	 * @param	integer		$pageId: ...
	 * @return	array		Command array for tcemain
	 */
	public function getCmdArrayForPublishWS($wsid, $doSwap, $pageId = 0) {

		$wsid = intval($wsid);
		$cmd = array();

		if ($wsid >= -1 && $wsid!==0) {

				// Define stage to select:
			$stage = -99;
			if ($wsid > 0) {
				$workspaceRec = t3lib_BEfunc::getRecord('sys_workspace', $wsid);
				if ($workspaceRec['publish_access'] & 1) {
					$stage = Tx_Workspaces_Service_Stages::STAGE_PUBLISH_ID;
				}
			}

				// Select all versions to swap:
			$versions = $this->selectVersionsInWorkspace($wsid, 0, $stage, ($pageId ? $pageId : -1), 0, 'tables_modify');

				// Traverse the selection to build CMD array:
			foreach ($versions as $table => $records) {
				foreach ($records as $rec) {
						// Build the cmd Array:
					$cmd[$table][$rec['t3ver_oid']]['version'] = array('action' => 'swap', 'swapWith' => $rec['uid'], 'swapIntoWS' => $doSwap ? 1 : 0);
				}
			}
		}
		return $cmd;
	}


	/**
	 * Building tcemain CMD-array for releasing all versions in a workspace.
	 *
	 * @param	integer		Real workspace ID, cannot be ONLINE (zero).
	 * @param	boolean		Run Flush (TRUE) or ClearWSID (FALSE) command
	 * @param	integer		$pageId: ...
	 * @return	array		Command array for tcemain
	 */
	public function getCmdArrayForFlushWS($wsid, $flush = TRUE, $pageId = 0) {

		$wsid = intval($wsid);
		$cmd = array();

		if ($wsid >= -1 && $wsid!==0) {
				// Define stage to select:
			$stage = -99;

				// Select all versions to swap:
			$versions = $this->selectVersionsInWorkspace($wsid, 0, $stage, ($pageId ? $pageId : -1), 0, 'tables_modify');

				// Traverse the selection to build CMD array:
			foreach ($versions as $table => $records) {
				foreach ($records as $rec) {
					// Build the cmd Array:
					$cmd[$table][$rec['uid']]['version'] = array('action' => ($flush ? 'flush' : 'clearWSID'));
				}
			}
		}
		return $cmd;
	}


	/**
	 * Select all records from workspace pending for publishing
	 * Used from backend to display workspace overview
	 * User for auto-publishing for selecting versions for publication
	 *
	 * @param	integer		Workspace ID. If -99, will select ALL versions from ANY workspace. If -98 will select all but ONLINE. >=-1 will select from the actual workspace
	 * @param	integer		Lifecycle filter: 1 = select all drafts (never-published), 2 = select all published one or more times (archive/multiple), anything else selects all.
	 * @param	integer		Stage filter: -99 means no filtering, otherwise it will be used to select only elements with that stage. For publishing, that would be "10"
	 * @param	integer		Page id: Live page for which to find versions in workspace!
	 * @param	integer		Recursion Level - select versions recursive - parameter is only relevant if $pageId != -1
	 * @param	string		How to collect records for "listing" or "modify" these tables. Support the permissions of each type of record (@see t3lib_userAuthGroup::check).
	 * @return	array		Array of all records uids etc. First key is table name, second key incremental integer. Records are associative arrays with uid, t3ver_oid and t3ver_swapmode fields. The pid of the online record is found as "livepid" the pid of the offline record is found in "wspid"
	 */
	public function selectVersionsInWorkspace($wsid, $filter = 0, $stage = -99, $pageId = -1, $recursionLevel = 0, $selectionType = 'tables_select') {

		$wsid = intval($wsid);
		$filter = intval($filter);
		$output = array();

			// Contains either nothing or a list with live-uids
		if ($pageId != -1 && $recursionLevel > 0) {
			$pageList = $this->getTreeUids($pageId, $wsid, $recursionLevel);
		} elseif ($pageId != -1) {
			$pageList = $pageId;
		} else {
			$pageList = '';
		}

			// Traversing all tables supporting versioning:
		foreach ($GLOBALS['TCA'] as $table => $cfg) {

				// we do not collect records from tables without permissions on them.
			if (! $GLOBALS['BE_USER']->check($selectionType, $table)) {
				continue;
			}

			if ($GLOBALS['TCA'][$table]['ctrl']['versioningWS']) {

				$recs = $this->selectAllVersionsFromPages($table, $pageList, $wsid, $filter, $stage);
				if (intval($GLOBALS['TCA'][$table]['ctrl']['versioningWS']) === 2) {
					$moveRecs = $this->getMoveToPlaceHolderFromPages($table, $pageList, $wsid, $filter, $stage);
					$recs = array_merge($recs, $moveRecs);
				}
				$recs = $this->filterPermittedElements($recs, $table);
				if (count($recs)) {
					$output[$table] = $recs;
				}
			}
		}
		return $output;
	}

	/**
	 * Find all versionized elements except moved records.
	 *
	 * @param string $table
	 * @param string $pageList
	 * @param integer $wsid
	 * @param integer $filter
	 * @param integer $stage
	 * @return array
	 */
	protected function selectAllVersionsFromPages($table, $pageList, $wsid, $filter, $stage) {

		$fields = 'A.uid, A.t3ver_oid, A.t3ver_stage, ' . ($table==='pages' ? ' A.t3ver_swapmode,' : '') . 'B.pid AS wspid, B.pid AS livepid';
		if (t3lib_BEfunc::isTableLocalizable($table)) {
			$fields .= ', A.' . $GLOBALS['TCA'][$table]['ctrl']['languageField'];
		}
		$from = $table . ' A,' . $table . ' B';

			// Table A is the offline version and pid=-1 defines offline
		$where = 'A.pid=-1 AND A.t3ver_state!=4';
		if ($pageList) {
			$pidField = ($table==='pages' ? 'uid' : 'pid');
			$pidConstraint = strstr($pageList, ',') ? ' IN (' . $pageList . ')' : '=' . $pageList;
			$where .= ' AND B.' . $pidField . $pidConstraint;
		}

		/**
		 * For "real" workspace numbers, select by that.
		 * If = -98, select all that are NOT online (zero).
		 * Anything else below -1 will not select on the wsid and therefore select all!
		 */
		if ($wsid > self::SELECT_ALL_WORKSPACES) {
			$where .= ' AND A.t3ver_wsid=' . $wsid;
		} elseif ($wsid === self::SELECT_ALL_WORKSPACES) {
			$where .= ' AND A.t3ver_wsid!=0';
		}

		/**
		 * lifecycle filter:
		 * 1 = select all drafts (never-published),
		 * 2 = select all published one or more times (archive/multiple)
		 */
		if ($filter===1 || $filter===2) {
			$where .= ' AND A.t3ver_count ' . ($filter === 1 ? '= 0' : '> 0');
		}

		if ($stage != -99) {
			$where .= ' AND A.t3ver_stage=' . intval($stage);
		}

			// Table B (online) must have PID >= 0 to signify being online.
		$where .= ' AND B.pid>=0';
			// ... and finally the join between the two tables.
		$where .= ' AND A.t3ver_oid=B.uid';
		$where .= t3lib_BEfunc::deleteClause($table, 'A');
		$where .= t3lib_BEfunc::deleteClause($table, 'B');

		/**
		 * Select all records from this table in the database from the workspace
		 * This joins the online version with the offline version as tables A and B
		 * Order by UID, mostly to have a sorting in the backend overview module which doesn't "jump around" when swapping.
		 */
		$res = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows($fields, $from, $where, '', 'B.uid');
		return is_array($res) ? $res : array();
	}

	/**
	 *	Find all moved records at their new position.
	 *
	 * @param string $table
	 * @param string $pageList
	 * @param integer $wsid
	 * @return array
	 */
	protected function getMoveToPlaceHolderFromPages($table, $pageList, $wsid, $filter, $stage) {

		/**
		 * Aliases:
		 * A - moveTo placeholder
		 * B - online record
		 * C - moveFrom placeholder
		 */
		$fields = 'A.pid AS wspid, B.uid AS t3ver_oid, C.uid AS uid, B.pid AS livepid';
		$from = $table . ' A, ' . $table . ' B,' . $table . ' C';
		$where = 'A.t3ver_state=3 AND B.pid>0 AND B.t3ver_state=0 AND B.t3ver_wsid=0 AND C.pid=-1 AND C.t3ver_state=4';

		if ($wsid > self::SELECT_ALL_WORKSPACES) {
			$where .= ' AND A.t3ver_wsid=' . $wsid . ' AND C.t3ver_wsid=' . $wsid;
		} elseif ($wsid === self::SELECT_ALL_WORKSPACES) {
			$where .= ' AND A.t3ver_wsid!=0 AND C.t3ver_wsid!=0 ';
		}

		/**
		 * lifecycle filter:
		 * 1 = select all drafts (never-published),
		 * 2 = select all published one or more times (archive/multiple)
		 */
		if ($filter===1 || $filter===2) {
			$where .= ' AND C.t3ver_count ' . ($filter === 1 ? '= 0' : '> 0');
		}

		if ($stage != -99) {
			$where .= ' AND C.t3ver_stage=' . intval($stage);
		}

		if ($pageList) {
			$pidField = ($table==='pages' ? 'B.uid' : 'A.pid');
			$pidConstraint = strstr($pageList, ',') ? ' IN (' . $pageList . ')' : '=' . $pageList;
			$where .= ' AND ' . $pidField . $pidConstraint;
		}

		$where .= ' AND A.t3ver_move_id = B.uid AND B.uid = C.t3ver_oid';
		$where .= t3lib_BEfunc::deleteClause($table, 'A');
		$where .= t3lib_BEfunc::deleteClause($table, 'B');
		$where .= t3lib_BEfunc::deleteClause($table, 'C');
		$res = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows($fields, $from, $where, '', 'A.uid');

		return is_array($res) ? $res : array();
	}


	/**
	 * Find all page uids recursive starting from a specific page
	 *
	 * @param	 integer	$pageId
	 * @param	 integer	$wsid
	 * @param	 integer	$recursionLevel
	 * @return	string	Comma sep. uid list
	 */
	protected function getTreeUids($pageId, $wsid, $recursionLevel) {
		/**
		 * Reusing existing functionality with the drawback that
		 * mount points are not covered yet
		 **/
		$perms_clause = $GLOBALS['BE_USER']->getPagePermsClause(1);
		$searchObj = t3lib_div::makeInstance('t3lib_fullsearch');
		$pageList = FALSE;
		if ($pageId > 0) {
			$pageList = $searchObj->getTreeList($pageId, $recursionLevel, 0, $perms_clause);
		} else {
			$mountPoints = $GLOBALS['BE_USER']->uc['pageTree_temporaryMountPoint'];
			if (!is_array($mountPoints) || empty($mountPoints)) {
				$mountPoints = array_map('intval', $GLOBALS['BE_USER']->returnWebmounts());
				$mountPoints = array_unique($mountPoints);
			}
			$newList = array();
			foreach($mountPoints as $mountPoint) {
				$newList[] = $searchObj->getTreeList($mountPoint, $recursionLevel, 0, $perms_clause);
			}
			$pageList = implode(',', $newList);
		}

		unset($searchObj);
		if (intval($GLOBALS['TCA']['pages']['ctrl']['versioningWS']) === 2 && $pageList) {
				// Remove the "subbranch" if a page was moved away
			$movedAwayPages = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows(
				'uid, pid, t3ver_move_id',
				'pages',
				't3ver_move_id IN (' . $pageList . ') AND t3ver_wsid=' . intval($wsid) . t3lib_BEfunc::deleteClause('pages'),
				'',
				'uid',
				'',
				't3ver_move_id'
			);
			$pageIds = t3lib_div::intExplode(',', $pageList, TRUE);

				// move all pages away
			$newList = array_diff($pageIds, array_keys($movedAwayPages));

				// keep current page in the list
			$newList[] = $pageId;
				// move back in if still connected to the "remaining" pages
			do {
				$changed = FALSE;
				foreach ($movedAwayPages as $uid => $rec) {
					if (in_array($rec['pid'], $newList) && !in_array($uid, $newList)) {
						$newList[] = $uid;
						$changed = TRUE;
					}
				}
			} while ($changed);
			$pageList = implode(',', $newList);

				// In case moving pages is enabled we need to replace all move-to pointer with their origin
			$pages = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows(
				'uid, t3ver_move_id',
				'pages',
				'uid IN (' . $pageList . ')' . t3lib_BEfunc::deleteClause('pages'),
				'',
				'uid',
				'',
				'uid'
			);

			$newList = array();
			$pageIds = t3lib_div::intExplode(',', $pageList, TRUE);
			if (!in_array($pageId, $pageIds)) {
				$pageIds[] = $pageId;
			}
			foreach ($pageIds as $pageId) {
				if (intval($pages[$pageId]['t3ver_move_id']) > 0) {
					$newList[] = intval($pages[$pageId]['t3ver_move_id']);
				} else {
					$newList[] = $pageId;
				}
			}
			$pageList = implode(',', $newList);
		}
		return $pageList;
	}

	/**
	 * Remove all records which are not permitted for the user
	 *
	 * @param array $recs
	 * @param string $table
	 * @return array
	 */
	protected function filterPermittedElements($recs, $table) {
		$checkField = ($table == 'pages') ? 'uid' : 'wspid';
		$permittedElements = array();
		if (is_array($recs)) {
			foreach ($recs as $rec) {
				$page = t3lib_beFunc::getRecord('pages', $rec[$checkField], 'uid,pid,perms_userid,perms_user,perms_groupid,perms_group,perms_everybody');
				if ($GLOBALS['BE_USER']->doesUserHaveAccess($page, 1) && $this->isLanguageAccessibleForCurrentUser($table, $rec)) {
					$permittedElements[] = $rec;
				}
			}
		}
		return $permittedElements;
	}

	/**
	* Check current be users language access on given record.
	*
	* @param string $table Name of the table
	* @param array $record Record row to be checked
	* @return boolean
	*/
	protected function isLanguageAccessibleForCurrentUser($table, array $record) {
		$languageUid = 0;

		if (t3lib_BEfunc::isTableLocalizable($table)) {
			$languageUid = $record[$GLOBALS['TCA'][$table]['ctrl']['languageField']];
		} else {
			return TRUE;
		}

		return $GLOBALS['BE_USER']->checkLanguageAccess($languageUid);
	}

	/**
	 * Trivial check to see if the user already migrated his workspaces
	 * to the new style (either manually or with the migrator scripts)
	 *
	 * @return bool
	 */
	public static function isOldStyleWorkspaceUsed() {
		$oldStyleWorkspaceIsUsed = FALSE;
		$cacheKey = 'workspace-oldstyleworkspace-notused';
		$cacheResult = $GLOBALS['BE_USER']->getSessionData($cacheKey);
		if (!$cacheResult) {
			$where = 'adminusers != "" AND adminusers NOT LIKE "%be_users%" AND adminusers NOT LIKE "%be_groups%" AND deleted=0';
			$count = $GLOBALS['TYPO3_DB']->exec_SELECTcountRows('uid', 'sys_workspace', $where);
			$oldStyleWorkspaceIsUsed = $count > 0;
			$GLOBALS['BE_USER']->setAndSaveSessionData($cacheKey, !$oldStyleWorkspaceIsUsed);
		} else {
			$oldStyleWorkspaceIsUsed = !$cacheResult;
		}
		return $oldStyleWorkspaceIsUsed;
	}

	/**
	 * Determine whether a specific page is new and not yet available in the LIVE workspace
	 *
	 * @static
	 * @param $id Primary key of the page to check
	 * @param $language Language for which to check the page
	 * @return bool
	 */
	public static function isNewPage($id, $language = 0) {
		$isNewPage = FALSE;
			// If the language is not default, check state of overlay
		if ($language > 0) {
			$whereClause = 'pid = ' . $id;
			$whereClause .= ' AND ' .$GLOBALS['TCA']['pages_language_overlay']['ctrl']['languageField'] . ' = ' . $language;
			$whereClause .= ' AND t3ver_wsid = ' . $GLOBALS['BE_USER']->workspace;
			$whereClause .= t3lib_BEfunc::deleteClause('pages_language_overlay');
			$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery('t3ver_state', 'pages_language_overlay', $whereClause);
			if (($row = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res))) {
				$isNewPage = (int) $row['t3ver_state'] === 1;
			}

			// Otherwise check state of page itself
		} else {
			$rec = t3lib_BEfunc::getRecord('pages', $id, 't3ver_state');
			if (is_array($rec)) {
				$isNewPage = (int) $rec['t3ver_state'] === 1;
			}
		}
		return $isNewPage;
	}

	/**
	 * Generates a view link for a page.
	 *
	 * @static
	 * @param  $table
	 * @param  $uid
	 * @param  $record
	 * @return string
	 */
	public static function viewSingleRecord($table, $uid, $record=NULL) {
		$viewUrl = '';
		if ($table == 'pages') {
			$viewUrl = t3lib_BEfunc::viewOnClick(t3lib_BEfunc::getLiveVersionIdOfRecord('pages', $uid));
		} elseif ($table == 'pages_language_overlay' || $table == 'tt_content') {
			$elementRecord = is_array($record) ? $record : t3lib_BEfunc::getLiveVersionOfRecord($table, $uid);
			$viewUrl = t3lib_BEfunc::viewOnClick($elementRecord['pid']);
		} else {
			if (isset($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['workspaces']['viewSingleRecord'])) {
				$_params = array('table' => $table, 'uid' => $uid, 'record' => $record);
				$_funcRef = $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['workspaces']['viewSingleRecord'];
				$null = NULL;
				$viewUrl = t3lib_div::callUserFunction($_funcRef, $_params, $null);
			}
		}
		return $viewUrl;
	}

	/**
	 * Determine whether this page for the current
	 *
	 * @param  $pageUid
	 * @param  $workspaceUid
	 * @return void
	 */
	public function canCreatePreviewLink($pageUid, $workspaceUid) {
		$result = TRUE;
		if ($pageUid > 0 && $workspaceUid > 0) {
			$pageRecord = t3lib_BEfunc::getRecord('pages', $pageUid);
			t3lib_BEfunc::workspaceOL('pages', $pageRecord, $workspaceUid);
			if (!t3lib_div::inList($GLOBALS['TYPO3_CONF_VARS']['FE']['content_doktypes'], $pageRecord['doktype'])) {
				$result = FALSE;
			}
		} else {
			$result = FALSE;
		}
		return $result;
	}

	/**
	 * Generates a workspace preview link.
	 *
	 * @param integer $uid The ID of the record to be linked
	 * @return string the full domain including the protocol http:// or https://, but without the trailing '/'
	 */
	public function generateWorkspacePreviewLink($uid) {
		$previewObject = t3lib_div::makeInstance('Tx_Version_Preview');
		$timeToLiveHours = $previewObject->getPreviewLinkLifetime();
		$previewKeyword = $previewObject->compilePreviewKeyword('', $GLOBALS['BE_USER']->user['uid'], ($timeToLiveHours*3600), $this->getCurrentWorkspace());

		$linkParams = array(
			'ADMCMD_prev' => $previewKeyword,
			'id' => $uid
		);
		return t3lib_BEfunc::getViewDomain($uid) . '/index.php?' . t3lib_div::implodeArrayForUrl('', $linkParams);
	}

	/**
	 * Generates a workspace splitted preview link.
	 *
	 * @param integer $uid The ID of the record to be linked
	 * @param boolean $addDomain Parameter to decide if domain should be added to the generated link, FALSE per default
	 * @return string the preview link without the trailing '/'
	 */
	public function generateWorkspaceSplittedPreviewLink($uid, $addDomain = FALSE) {
			// In case a $pageUid is submitted we need to make sure it points to a live-page
		if ($uid >  0) {
			$uid = $this->getLivePageUid($uid);
		}

		$objectManager = t3lib_div::makeInstance('Tx_Extbase_Object_ObjectManager');
		/** @var $uriBuilder Tx_Extbase_MVC_Web_Routing_UriBuilder */
		$uriBuilder = $objectManager->create('Tx_Extbase_MVC_Web_Routing_UriBuilder');
		/**
		 *  This seems to be very harsh to set this directly to "/typo3 but the viewOnClick also
		 *  has /index.php as fixed value here and dealing with the backPath is very error-prone
		 *
		 *  @todo make sure this would work in local extension installation too
		 */
		$backPath = '/' . TYPO3_mainDir;
		$redirect = $backPath . 'index.php?redirect_url=';
			// @todo why do we need these additional params? the URIBuilder should add the controller, but he doesn't :(
		$additionalParams = '&tx_workspaces_web_workspacesworkspaces%5Bcontroller%5D=Preview&M=web_WorkspacesWorkspaces&id=';
		$viewScript = $backPath . $uriBuilder->setArguments(array('tx_workspaces_web_workspacesworkspaces' => array('previewWS' => $GLOBALS['BE_USER']->workspace)))
												->uriFor('index', array(), 'Tx_Workspaces_Controller_PreviewController', 'workspaces', 'web_workspacesworkspaces') . $additionalParams;

		if ($addDomain === TRUE) {
			return t3lib_BEfunc::getViewDomain($uid) . $redirect . urlencode($viewScript) . $uid;
		} else {
			return $viewScript;
		}
	}

	/**
	 * Find the Live-Uid for a given page,
	 * the results are cached at run-time to avoid too many database-queries
	 *
	 * @throws InvalidArgumentException
	 * @param integer $uid
	 * @return integer
	 */
	public function getLivePageUid($uid) {
		if (!isset($this->pageCache[$uid])) {
			$pageRecord = t3lib_beFunc::getRecord('pages', $uid);
			if (is_array($pageRecord)) {
				$this->pageCache[$uid] = ($pageRecord['t3ver_oid'] ? $pageRecord['t3ver_oid'] : $uid);
			} else {
				throw new InvalidArgumentException('uid is supposed to point to an existing page - given value was:' . $uid, 1290628113);
			}
		}

		return $this->pageCache[$uid];
	}
}


if (defined('TYPO3_MODE') && isset($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['ext/workspaces/Classes/Service/Workspaces.php'])) {
	include_once($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['ext/workspaces/Classes/Service/Workspaces.php']);
}
?>