egroupware/calendar/inc/class.calendar_uiforms.inc.php

<?php
/**
 * EGroupware - Calendar's forms of the UserInterface
 *
 * @link http://www.egroupware.org
 * @package calendar
 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
 * @copyright (c) 2004-11 by RalfBecker-At-outdoor-training.de
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @version $Id$
 */

/**
 * calendar UserInterface forms: view and edit events, freetime search
 *
 * The new UI, BO and SO classes have a strikt definition, in which time-zone they operate:
 *  UI only operates in user-time, so there have to be no conversation at all !!!
 *  BO's functions take and return user-time only (!), they convert internaly everything to servertime, because
 *  SO operates only on server-time
 *
 * The state of the UI elements is managed in the uical class, which all UI classes extend.
 *
 * All permanent debug messages of the calendar-code should done via the debug-message method of the bocal class !!!
 */
class calendar_uiforms extends calendar_ui
{
	var $public_functions = array(
		'freetimesearch'  => True,
		'edit' => true,
		'process_edit' => true,
		'export' => true,
		'import' => true,
		'cat_acl' => true,
		'meeting' => true,
	);

	/**
	 * Standard durations used in edit and freetime search
	 *
	 * @var array
	 */
	var $durations = array();

	/**
	 * default locking time for entries, that are opened by another user
	 *
	 * @var locktime in seconds
	 */
	var $locktime_default=1;

	/**
	 * Constructor
	 */
	function __construct()
	{
		parent::__construct(true);	// call the parent's constructor

		for ($n=15; $n <= 8*60; $n+=($n < 60 ? 15 : ($n < 240 ? 30 : 60)))
		{
			$this->durations[$n*60] = sprintf('%d:%02d',$n/60,$n%60);
		}
	}

	/**
	 * Create a default event (adding a new event) by evaluating certain _GET vars
	 *
	 * @return array event-array
	 */
	function &default_add_event()
	{
		$extra_participants = $_GET['participants'] ? explode(',',$_GET['participants']) : array();

		if (isset($_GET['owner']))
		{
			$owner = $_GET['owner'];
		}
		// dont set the planner start group as owner/participants if called from planner
		elseif ($this->view != 'planner' || $this->owner != $this->cal_prefs['planner_start_with_group'])
		{
			$owner = $this->owner;
		}

		if (!$owner || !is_numeric($owner) || $GLOBALS['egw']->accounts->get_type($owner) != 'u' ||
			!$this->bo->check_perms(EGW_ACL_ADD,0,$owner))
		{
			if ($owner)	// make an owner who is no user or we have no add-rights a participant
			{
				// if we come from ressources we don't need any users selected in calendar
				if (!isset($_GET['participants']) || $_GET['participants'][0] != 'r')
				{
					foreach(explode(',',$owner) as $uid)
					{
						// only add users or a single ressource, not all ressources displayed by a category
						if (is_numeric($uid) || $owner == $uid)
						{
							$extra_participants[] = $uid;
						}
					}
				}
			}
			$owner = $this->user;
		}
		//echo "<p>this->owner=$this->owner, _GET[owner]=$_GET[owner], user=$this->user => owner=$owner, extra_participants=".implode(',',$extra_participants)."</p>\n";

		// by default include the owner as participant (the user can remove him)
		$extra_participants[] = $owner;

		$start = $this->bo->date2ts(array(
			'full' => isset($_GET['date']) && (int) $_GET['date'] ? (int) $_GET['date'] : $this->date,
			'hour' => (int) (isset($_GET['hour']) && (int) $_GET['hour'] ? $_GET['hour'] : $this->bo->cal_prefs['workdaystarts']),
			'minute' => (int) $_GET['minute'],
		));
		//echo "<p>_GET[date]=$_GET[date], _GET[hour]=$_GET[hour], _GET[minute]=$_GET[minute], this->date=$this->date ==> start=$start=".date('Y-m-d H:i',$start)."</p>\n";

		$participant_types['u'] = $participant_types = $participants = array();
		foreach($extra_participants as $uid)
		{
			if (isset($participants[$uid])) continue;	// already included

			if (!$this->bo->check_acl_invite($uid)) continue;	// no right to invite --> ignored

			if (is_numeric($uid))
			{
				$participants[$uid] = $participant_types['u'][$uid] =
					calendar_so::combine_status($uid == $this->user ? 'A' : 'U',1,
					($uid == $this->user || ($uid == $owner && $this->bo->check_perms(EGW_ACL_ADD,0,$owner))) ? 'CHAIR' : 'REQ-PARTICIPANT');
			}
			elseif (is_array($this->bo->resources[$uid[0]]))
			{
				// if contact is a user, use the user instead (as the GUI)
				if ($uid[0] == 'c' && ($account_id = $GLOBALS['egw']->accounts->name2id(substr($uid,1),'person_id')))
				{
					$uid = $account_id;
					$participants[$uid] = $participant_types['u'][$uid] =
						calendar_so::combine_status($uid == $this->user ? 'A' : 'U',1,
						($uid == $this->user || ($uid == $owner && $this->bo->check_perms(EGW_ACL_ADD,0,$owner))) ? 'CHAIR' : 'REQ-PARTICIPANT');
					continue;
				}
				$res_data = $this->bo->resources[$uid[0]];
				list($id,$quantity) = explode(':',substr($uid,1));
				if (($status = $res_data['new_status'] ? ExecMethod($res_data['new_status'],$id) : 'U'))
				{
					$participants[$uid] = $participant_types[$uid[0]][$id] =
						calendar_so::combine_status($status,$quantity,'REQ-PARTICIPANT');
				}
			}
		}
		if (!$participants)	// if all participants got removed, include current user
		{
			$participants[$this->user] = $participant_types['u'][$this->user] = calendar_so::combine_status('A',1,'CHAIR');
		}
		return array(
			'participant_types' => $participant_types,
			'participants' => $participants,
			'owner' => $owner,
			'start' => $start,
			'end'   => $start + (int) $this->bo->cal_prefs['defaultlength']*60,
			'tzid'  => $this->bo->common_prefs['tz'],
			'priority' => 2,	// normal
			'public'=> $this->cal_prefs['default_private'] ? 0 : 1,
			'alarm' => array(),
		);
	}

	/**
	 * Process the edited event and evtl. call edit to redisplay it
	 *
	 * @param array $content posted eTemplate content
	 * @ToDo add conflict check / available quantity of resources when adding participants
	 */
	function process_edit($content)
	{
		if (!is_array($content))	// redirect from etemplate, if POST empty
		{
			return $this->edit(null,null,strip_tags($_GET['msg']));
		}
		$messages = null;
		$msg_permission_denied_added = false;
		list($button) = @each($content['button']);
		if (!$button && $content['action']) $button = $content['action'];	// action selectbox
		unset($content['button']); unset($content['action']);

		$view = $content['view'];
		if ($button == 'ical')
		{
			$msg = $this->export($content['id'],true);
		}
		// delete a recur-exception
		if ($content['recur_exception']['delete_exception'])
		{
			list($date) = each($content['recur_exception']['delete_exception']);
			unset($content['recur_exception']['delete_exception']);
			if (($key = array_search($date,$content['recur_exception'])) !== false)
			{
				// propagate the exception to a single event
				$recur_exceptions = $this->bo->so->get_related($content['uid']);
				foreach ($recur_exceptions as $id)
				{
					if (!($exception = $this->bo->read($id)) ||
							$exception['recurrence'] != $content['recur_exception'][$key]) continue;
					$exception['uid'] = common::generate_uid('calendar', $id);
					$exception['reference'] = $exception['recurrence'] = 0;
					$this->bo->update($exception, true, true,false,true,$message,$content['no_notifications']);
					break;
				}
				unset($content['recur_exception'][$key]);
				$content['recur_exception'] = array_values($content['recur_exception']);
			}
		}
		// delete an alarm
		if ($content['alarm']['delete_alarm'])
		{
			list($id) = each($content['alarm']['delete_alarm']);
			//echo "delete alarm $id"; _debug_array($content['alarm']['delete_alarm']);

			if ($content['id'])
			{
				if ($this->bo->delete_alarm($id))
				{
					$msg = lang('Alarm deleted');
					unset($content['alarm'][$id]);
					$js = "opener.location.search += (opener.location.search?'&msg=':'?msg=')+'".
						addslashes($msg)."';";
				}
				else
				{
					$msg = lang('Permission denied');
				}
			}
			else
			{
				unset($content['alarm'][$id]);
			}
		}
		if ($content['duration'])
		{
			$content['end'] = $content['start'] + $content['duration'];
		}
		$event = $content;
		unset($event['new_alarm']);
		unset($event['alarm']['delete_alarm']);
		unset($event['duration']);

		if (in_array($button,array('ignore','freetime','reedit')))
		{
			// no conversation necessary, event is already in the right format
		}
		else
		{
			// convert content => event
			if ($content['whole_day'])
			{
				$event['start'] = $this->bo->date2array($event['start']);
				$event['start']['hour'] = $event['start']['minute'] = 0; unset($event['start']['raw']);
				$event['start'] = $this->bo->date2ts($event['start']);
				$event['end'] = $this->bo->date2array($event['end']);
				$event['end']['hour'] = 23; $event['end']['minute'] = $event['end']['second'] = 59; unset($event['end']['raw']);
				$event['end'] = $this->bo->date2ts($event['end']);
			}
			// some checks for recurrences, if you give a date, make it a weekly repeating event and visa versa
			if ($event['recur_type'] == MCAL_RECUR_NONE && $event['recur_data']) $event['recur_type'] = MCAL_RECUR_WEEKLY;
			if ($event['recur_type'] == MCAL_RECUR_WEEKLY && !$event['recur_data'])
			{
				$event['recur_data'] = 1 << (int)date('w',$event['start']);
			}
			if (isset($content['participants']))
			{

				$event['participants'] = $event['participant_types'] = array();

				foreach($content['participants'] as $key => $data)
				{
					switch($key)
					{
						case 'delete':		// handled in default
						case 'quantity':	// handled in new_resource
						case 'role':		// handled in add, account or resource
						case 'cal_resources':
						case 'status_date':
							break;

						case 'add':
							// email or rfc822 addresse (eg. "Ralf Becker <ralf@domain.com>") in the search field
							// ToDo: get eTemplate to return that field
							if (($email = $_POST['exec']['participants']['resource']['query']) &&
									(preg_match('/^(.*<)?([a-z0-9_.-]+@[a-z0-9_.-]{5,})>?$/i',$email,$matches)))
							{
								$status = calendar_so::combine_status('U',$content['participants']['quantity'],$content['participants']['role']);
								// check if email belongs to account or contact --> prefer them over just emails (if we are allowed to invite him)
								if (($data = $GLOBALS['egw']->accounts->name2id($matches[2],'account_email')) && $this->bo->check_acl_invite($data))
								{
									$event['participants'][$data] = $event['participant_types']['u'][$data] = $status;
								}
								elseif ((list($data) = ExecMethod2('addressbook.addressbook_bo.search',array(
									'email' => $matches[2],
									'email_home' => $matches[2],
								),true,'','','',false,'OR')))
								{
									$event['participants']['c'.$data['id']] = $event['participant_types']['c'][$data['id']] = $status;
								}
								else
								{
									$event['participants']['e'.$email] = $event['participant_types']['e'][$email] = $status;
								}
							}
							elseif (!$content['participants']['account'] && !$content['participants']['resource'])
							{
								$msg = lang('You need to select an account, contact or resource first!');
							}
							break;

						case 'resource':
							if (is_array($data))	// if $data['current'] is NOT set --> $app==''
							{
								list($app,$id) = explode(':',$data['current']);
							}
							else
							{
								list($app,$id) = explode(':',$data);
							}
							foreach($this->bo->resources as $type => $data) if ($data['app'] == $app) break;
							$uid = $this->bo->resources[$type]['app'] == $app ? $type.$id : false;
							if ($app == 'home-accounts')
							{
								$data = $id;
							}
							// check if new entry is no account (or contact entry of an account)
							elseif ($app != 'addressbook' || !($data = $GLOBALS['egw']->accounts->name2id($id,'person_id')) || !$this->bo->check_acl_invite($data))
							{
								if ($uid && $id)
								{
									$status = isset($this->bo->resources[$type]['new_status']) ? ExecMethod($this->bo->resources[$type]['new_status'],$id) : 'U';
									if ($status)
									{
										$res_info = $this->bo->resource_info($uid);
										// todo check real availability = maximum - already booked quantity
										if (isset($res_info['useable']) && $content['participants']['quantity'] > $res_info['useable'])
										{
											$msg .= lang('Maximum available quantity of %1 exceeded!',$res_info['useable']);
											foreach(array('quantity','resource','role') as $n)
											{
												$event['participants'][$n] = $content['participants'][$n];
											}
										}
										else
										{
											$event['participants'][$uid] = $event['participant_types'][$type][$id] =
												calendar_so::combine_status($status,$content['participants']['quantity'],$content['participants']['role']);
										}
									}
									elseif(!$msg_permission_denied_added)
									{
										$msg .= lang('Permission denied!');
										$msg_permission_denied_added = true;
									}
								}
								break;
							}
							// fall-through for accounts entered as contact
						case 'account':
							foreach(is_array($data) ? $data : explode(',',$data) as $uid)
							{
								if ($uid && $this->bo->check_acl_invite($uid))
								{
									$event['participants'][$uid] = $event['participant_types']['u'][$uid] =
										calendar_so::combine_status($uid == $this->bo->user ? 'A' : 'U',1,$content['participants']['role']);
								}
								elseif($uid && !$msg_permission_denied_added)
								{
									$msg .= lang('Permission denied!');
									$msg_permission_denied_added = true;
								}
							}
							break;

						default:		// existing participant row
							foreach(array('uid','status','quantity','role') as $name)
							{
								$$name = $data[$name];
							}
							if ($content['participants']['delete'][$uid] || $content['participants']['delete'][md5($uid)])
							{
								$uid = false;	// entry has been deleted
							}
							elseif ($uid)
							{
								if (is_numeric($uid))
								{
									$id = $uid;
									$type = 'u';
								}
								else
								{
									$id = substr($uid,1);
									$type = $uid[0];
								}
								if ($data['old_status'] != $status && !(!$data['old_status'] && $status == 'G'))
								{
									//echo "<p>$uid: status changed '$data[old_status]' --> '$status<'/p>\n";
									$new_status = calendar_so::combine_status($status, $quantity, $role);
									if ($this->bo->set_status($event['id'],$uid,$new_status,isset($content['edit_single']) ? $content['participants']['status_date'] : 0, false, true, $content['no_notifications']))
									{
										// refreshing the calendar-view with the changed participant-status
										if($event['recur_type'] != MCAL_RECUR_NONE)
										{
											$msg = lang('Status for all future scheduled days changed');
										}
										else
										{
											if(isset($content['edit_single']))
											{
												$msg = lang('Status for this particular day changed');
												// prevent accidentally creating a real exception afterwards
												$view = true;
												$hide_delete = true;
											}
											else
											{
												$msg = lang('Status changed');
											}
										}
										if (!$content['no_popup'])
										{
											$js = "opener.location.search += (opener.location.search?'&msg=':'?msg=')+'".
												addslashes($msg)."';";
										}
									}
								}
								if ($uid && $status != 'G')
								{
									$event['participants'][$uid] = $event['participant_types'][$type][$id] =
										calendar_so::combine_status($status,$quantity,$role);
								}
							}
							break;
					}
				}
			}
		}
		$preserv = array(
			'view'			=> $view,
			'hide_delete'	=> $hide_delete,
			'edit_single'	=> $content['edit_single'],
			'reference'		=> $content['reference'],
			'recurrence'	=> $content['recurrence'],
			'actual_date'	=> $content['actual_date'],
			'no_popup'		=> $content['no_popup'],
			'tabs'			=> $content['tabs'],
			'template'      => $content['template'],
		);
		$noerror=true;

		//error_log(__METHOD__.$button.'#'.array2string($content['edit_single']).'#');

		$ignore_conflicts = $edit_series_confirmed = $status_reset_to_unknown = false;

		switch((string)$button)
		{
			case 'ignore':
				$ignore_conflicts = true;
				$button = $event['button_was'];	// save or apply
				unset($event['button_was']);
				break;

			case 'confirm_edit_series':
				$edit_series_confirmed = true;
				$button = $event['button_was'];	// save or apply
				unset($event['button_was']);
		}

		switch((string)$button)
		{
		case 'exception':	// create an exception in a recuring event
			$msg = $this->_create_exception($event,$preserv);
			break;

		case 'copy':	// create new event with copied content, some content need to be unset to make a "new" event
			unset($event['id']);
			unset($event['uid']);
			unset($event['alarm']);
			unset($event['reference']);
			unset($event['recurrence']);
			unset($event['recur_exception']);
			unset($event['edit_single']);	// in case it has been set
			unset($event['modified']);
			unset($event['modifier']);
			unset($event['caldav_name']);
			$event['owner'] = !(int)$this->owner || !$this->bo->check_perms(EGW_ACL_ADD,0,$this->owner) ? $this->user : $this->owner;

			// Clear participant stati
			foreach($event['participant_types'] as $type => &$participants)
			{
				foreach($participants as $id => &$response)
				{
					if($type == 'u' && $id == $event['owner']) continue;
					calendar_so::split_status($status, $quantity, $role);
					$response = calendar_so::combine_status('U',$quantity,$role);
				}
			}
			$preserv['view'] = $preserv['edit_single'] = false;
			$msg = lang('Event copied - the copy can now be edited');
			$event['title'] = lang('Copy of:').' '.$event['title'];
			break;

		case 'mail':
		case 'sendrequest':
		case 'save':
		case 'print':
		case 'apply':
			if ($event['id'] && !$this->bo->check_perms(EGW_ACL_EDIT,$event))
			{
				switch ($button)
				{
					case 'sendrequest':
					case 'mail':	// just mail without edit-rights is ok
						$js = $this->custom_mail($event,false,($button=='sendrequest'));
						break 2;
					case 'print':	// just print without edit-rights is ok
						$js = $this->custom_print($event,false);
						break 2;
				}
				$msg = lang('Permission denied');
				$button = '';
				break;
			}
			if ($event['start'] > $event['end'])
			{
				$msg = lang('Error: Starttime has to be before the endtime !!!');
				$button = '';
				break;
			}
			if ($event['recur_type'] != MCAL_RECUR_NONE && $event['recur_enddate'] && $event['start'] > $event['recur_enddate'])
			{
				$msg = lang('repetition').': '.lang('Error: Starttime has to be before the endtime !!!');
				$button = '';
				break;
			}
			if (!$event['participants'])
			{
				$msg = lang('Error: no participants selected !!!');
				$button = '';
				break;
			}
			// if private event with ressource reservation is forbidden
			if (!$event['public'] && $GLOBALS['egw_info']['server']['no_ressources_private'])
			{
				foreach ($event['participants'] as $uid => $value)
				{
					if ($uid[0] == 'r') //ressource detection
					{
						$msg = lang('Error: ressources reservation in private events is not allowed!!!');
						$button = '';
						break 2; //break foreach and case
					}
				}
			}
			if ($content['edit_single'])	// we edited a single event from a series
			{
				$event['reference'] = $event['id'];
				$event['recurrence'] = $content['edit_single'];
				unset($event['id']);
				// modifiy alarms for the exception, unsetting alarm-id to create new alarms
				foreach($event['alarm'] as $n => &$alarm)
				{
					unset($alarm['id']);
				}
				$conflicts = $this->bo->update($event,$ignore_conflicts,true,false,true,$messages,$content['no_notifications']);
				if (!is_array($conflicts) && $conflicts)
				{
					// now we need to add the original start as recur-execption to the series
					$recur_event = $this->bo->read($event['reference']);
					$recur_event['recur_exception'][] = $content['edit_single'];
					unset($recur_event['start']); unset($recur_event['end']);	// no update necessary
					unset($recur_event['alarm']);	// unsetting alarms too, as they cant be updated without start!
					$this->bo->update($recur_event,true);	// no conflict check here
					unset($recur_event);
					unset($event['edit_single']);			// if we further edit it, it's just a single event
					unset($preserv['edit_single']);
				}
				else	// conflict or error, we need to reset everything to the state befor we tried to save it
				{
					$event['id'] = $event['reference'];
					unset($event['reference']);
					$event['uid'] = $content['uid'];
				}
			}
			else	// we edited a non-reccuring event or the whole series
			{
				if (($old_event = $this->bo->read($event['id'])))
				{
					if ($event['recur_type'] != MCAL_RECUR_NONE)
					{
						// we edit a existing series event
						if ($event['start'] != $old_event['start'] ||
							$event['whole_day'] != $old_event['whole_day'])
						{
							if(!($next_occurrence = $this->bo->read($event['id'], $this->bo->now_su + 1, true)))
							{
								$msg = lang("Error: You can't shift a series from the past!");
								$noerror = false;
								break;
							}
							// splitting of series confirmed or first event clicked (no confirmation necessary)
							if ($edit_series_confirmed || $old_event['start'] == $event['actual_date'])
							{
								$edit_series_confirmed = true;
								$orig_event = $event;

								// calculate offset against old series start or clicked recurrance,
								// depending on which is smaller
								$offset = $event['start'] - $old_event['start'];
								if (abs($offset) > abs($off2 = $event['start'] - $event['actual_date']))
								{
									$offset = $off2;
								}
								// base start-date of new series on actual / clicked date
								$actual_date = $event['actual_date'];
								$event['start'] = $actual_date + $offset;
								if ($content['duration'])
								{
									$event['end'] = $event['start'] + $content['duration'];
								}
								elseif($event['end'] < $event['start'])
								{
									$event['end'] = $event['start'] + $event['end'] - $actual_date;
								}
								//echo "<p>".__LINE__.": event[start]=$event[start]=".egw_time::to($event['start']).", duration=$content[duration], event[end]=$event[end]=".egw_time::to($event['end']).", offset=$offset</p>\n";
								$event['participants'] = $old_event['participants'];
								foreach ($old_event['recur_exception'] as $key => $exdate)
								{
									if ($exdate > $actual_date)
									{
										unset($old_event['recur_exception'][$key]);
										$event['recur_exception'][$key] += $offset;
									}
									else
									{
										unset($event['recur_exception'][$key]);
									}
								}
								$old_alarms = $old_event['alarm'];
								if ($old_event['start'] < $actual_date)
								{
									unset($orig_event);
									// copy event by unsetting the id(s)
									unset($event['id']);
									unset($event['uid']);
									unset($event['caldav_name']);

									// set enddate of existing event
									$rriter = calendar_rrule::event2rrule($old_event, true);
									$rriter->rewind();
									$last = $rriter->current();
									do
									{
										$rriter->next_no_exception();
										$occurrence = $rriter->current();
									}
									while ($rriter->valid() &&
											egw_time::to($occurrence, 'ts') < $actual_date &&
											($last = $occurrence));
									$last->setTime(0, 0, 0);
									$old_event['recur_enddate'] = egw_time::to($last, 'ts');
									if (!$this->bo->update($old_event,true,true,false,true,$dummy=null,$content['no_notifications']))
									{
										$msg .= ($msg ? ', ' : '') .lang('Error: the entry has been updated since you opened it for editing!').'<br />'.
											lang('Copy your changes to the clipboard, %1reload the entry%2 and merge them.','<a href="'.
												htmlspecialchars(egw::link('/index.php',array(
													'menuaction' => 'calendar.calendar_uiforms.edit',
													'cal_id'    => $content['id'],
													'referer'    => $referer,
												))).'">','</a>');
										$noerror = false;
										$event = $orig_event;
										break;
									}
									$event['alarm'] = array();
								}
							}
							else
							{
								$event['button_was'] = $button;	// remember for confirm
								$preserv['duration'] = $content['duration'];
								return $this->confirm_edit_series($event,$preserv);
							}
						}
					}
					else
					{
						if ($old_event['start'] != $event['start'] ||
							$old_event['end'] != $event['end'] ||
							$event['whole_day'] != $old_event['whole_day'])
						{
							$sameday = (date('Ymd', $old_event['start']) == date('Ymd', $event['start']));
							foreach((array)$event['participants'] as $uid => $status)
							{
								calendar_so::split_status($status,$q,$r);
								if ($uid[0] != 'c' && $uid[0] != 'e' && $uid != $this->bo->user && $status != 'U')
								{
									$preferences = CreateObject('phpgwapi.preferences',$uid);
									$part_prefs = $preferences->read_repository();
									switch ($part_prefs['calendar']['reset_stati'])
									{
										case 'no':
											break;
										case 'startday':
											if ($sameday) break;
										default:
											$status_reset_to_unknown = true;
											$event['participants'][$uid] = calendar_so::combine_status('U',$q,$r);
											// todo: report reset status to user
									}
								}
							}
						}
					}
				}
				$conflicts = $this->bo->update($event,$ignore_conflicts,true,false,true,$messages,$content['no_notifications']);
				unset($event['ignore']);
			}
			if (is_array($conflicts))
			{
				$event['button_was'] = $button;	// remember for ignore
				return $this->conflicts($event,$conflicts,$preserv);
			}
			// check if there are messages from update, eg. removed participants or categories because of missing rights
			if ($messages)
			{
				$msg  .= ($msg ? ', ' : '').implode(', ',$messages);
			}
			if ($conflicts === 0)
			{
				$msg .= ($msg ? ', ' : '') .lang('Error: the entry has been updated since you opened it for editing!').'<br />'.
							lang('Copy your changes to the clipboard, %1reload the entry%2 and merge them.','<a href="'.
								htmlspecialchars(egw::link('/index.php',array(
								'menuaction' => 'calendar.calendar_uiforms.edit',
								'cal_id'    => $content['id'],
							))).'">','</a>');
				$noerror = false;
			}
			elseif ($conflicts > 0)
			{
				if ($edit_series_confirmed)	// series moved by splitting in two
				{
					foreach ($old_alarms as $alarm)
					{
						// check if alarms still needed in old event, if not delete it
						$event_time = $alarm['time'] + $alarm['offset'];
						if ($event_time >= $actual_date)
						{
							$this->bo->delete_alarm($alarm['id']);
						}
						$alarm['time'] += $offset;
						unset($alarm['id']);
						// if alarm would be in the past (eg. event moved back) --> move to next possible recurrence
						if ($alarm['time'] < $this->bo->now_su)
						{
							if (($next_occurrence = $this->bo->read($event['id'], $this->bo->now_su+$alarm['offset'], true)))
							{
								$alarm['time'] =  $next_occurrence['start'] - $alarm['offset'];
							}
							else
							{
								$alarm = false;	// no (further) recurence found --> ignore alarm
							}
						}
						// alarm is currently on a previous recurrence --> set for first recurrence of new series
						elseif ($event_time < $event['start'])
						{
							$alarm['time'] =  $event['start'] - $alarm['offset'];
						}
						if ($alarm)
						{
							$alarm['id'] = $this->bo->save_alarm($event['id'], $alarm);
							$event['alarm'][$alarm['id']] = $alarm;
						}
					}
					// attach all future exceptions to the new series
					$events =& $this->bo->search(array(
						'query' => array('cal_uid' => $old_event['uid']),
						'filter' => 'owner',  // return all possible entries
						'daywise' => false,
						'date_format' => 'ts',
					));
					foreach ((array)$events as $exception)
					{
						if ($exception['recurrence'] > $actual_date)
						{
							$exception['recurrence'] += $offset;
							$exception['reference'] = $event['id'];
							$exception['uid'] = $event['uid'];
							$exception['start'] += $offset;
							$exception['end'] += $offset;
							$exception['whole_day'] = $event['whole_day'];
							$alarms = array();
							foreach ($exception['alarm'] as $id => &$alarm)
							{
								$alarm['time'] = $exception['start'] - $alarm['offset'];
								$alarms[] = $alarm;
							}
							$event['alarm'] = $alarms;
							$this->bo->update($exception, true, true, true, true, $msg=null, $content['no_notifications']);
						}
					}
				}

				$message = lang('Event saved');
				if ($status_reset_to_unknown)
				{
					foreach((array)$event['participants'] as $uid => $status)
					{
						if ($uid[0] != 'c' && $uid[0] != 'e' && $uid != $this->bo->user)
						{
							calendar_so::split_status($status,$q,$r);
							$status = calendar_so::combine_status('U',$q,$r);
							$this->bo->set_status($event['id'], $uid, $status, 0, true);
						}
					}
					$message .= lang(', stati of participants reset');
				}

				$msg = $message . ($msg ? ', ' . $msg : '');

				// writing links for new entry, existing ones are handled by the widget itself
				if (!$content['id'] && is_array($content['link_to']['to_id']))
				{
					egw_link::link('calendar',$event['id'],$content['link_to']['to_id']);
				}
				$js = "opener.location.search += (opener.location.search?'&msg=':'?msg=')+'".
					addslashes($msg)."';";

				if ($button == 'print')
				{
					$js = $this->custom_print($event,!$content['id'])."\n".$js;	// first open the new window and then update the view
				}

				if ($button == 'mail' || $button == 'sendrequest')
				{
					$js = $this->custom_mail($event,!$content['id'],($button=='sendrequest'))."\n".$js;	// first open the new window and then update the view
				}
			}
			else
			{
				$msg = lang('Error: saving the event !!!');
			}
			break;

		case 'cancel':
			if($content['cancel_needs_refresh'])
			{
				$js = "opener.location.search += (opener.location.search?'&msg=':'?msg=')+'".
					addslashes($msg)."';";
			}
			break;

		case 'delete':					// delete of regular event
		case 'delete_keep_exceptions':	// series and user selected to keep the exceptions
		case 'delete_exceptions':		// series and user selected to delete the exceptions too
			if ($this->bo->delete($event['id'],(int)$content['edit_single']))
			{
				if ($event['recur_type'] != MCAL_RECUR_NONE && $content['reference'] == 0 && !$content['edit_single'])
				{
					$msg = lang('Series deleted');
					$delete_exceptions = $button == 'delete_exceptions';
					$exceptions_kept = false;
					// Handle the exceptions
					$recur_exceptions = $this->bo->so->get_related($event['uid']);
					foreach ($recur_exceptions as $id)
					{
						if ($delete_exceptions)
						{
							$this->bo->delete($id);
						}
						else
						{
							if (!($exception = $this->bo->read($id))) continue;
							$exception['uid'] = common::generate_uid('calendar', $id);
							$exception['reference'] = $exception['recurrence'] = 0;
							$this->bo->update($exception, true,true,false,true,$msg=null,$content['no_notifications']);
							$exceptions_kept = true;
						}
					}
					if ($exceptions_kept)
					{
						$msg .= lang(', exceptions preserved');
					}
				}
				else
				{
					$msg = lang('Event deleted');
				}
				$js = "opener.location += (opener.location.search?'&msg=':'?msg=')+'".
					addslashes($msg)."';";
			}
			break;

		case 'freetime':
			// the "click" has to be in onload, to make sure the button is already created
			$GLOBALS['egw']->js->set_onload("document.getElementsByName('exec[freetime]')[0].click();");
			break;

		case 'add_alarm':
			$time = ($content['actual_date'] ? $content['actual_date'] : $content['start']);
			$offset = DAY_s * $content['new_alarm']['days'] + HOUR_s * $content['new_alarm']['hours'] + 60 * $content['new_alarm']['mins'];
			if($content['before_after']) $offset *= -1;
			if ($event['recur_type'] != MCAL_RECUR_NONE &&
				($next_occurrence = $this->bo->read($event['id'], $this->bo->now_su + $offset, true)) &&
				$time < $next_occurrence['start'])
			{
				$time = $next_occurrence['start'];
			}
			if ($this->bo->check_perms(EGW_ACL_EDIT,!$content['new_alarm']['owner'] ? $event : 0,$content['new_alarm']['owner']))
			{
				$alarm = array(
					'offset' => $offset,
					'time'   => $time - $offset,
					'all'    => !$content['new_alarm']['owner'],
					'owner'  => $content['new_alarm']['owner'] ? $content['new_alarm']['owner'] : $this->user,
				);
				if ($alarm['time'] < $this->bo->now_su)
				{
					$msg = lang("Can't add alarms in the past !!!");
				}
				elseif ($event['id'])	// save the alarm immediatly
				{
					if (($alarm_id = $this->bo->save_alarm($event['id'],$alarm)))
					{
						$alarm['id'] = $alarm_id;
						$event['alarm'][$alarm_id] = $alarm;

						$msg = lang('Alarm added');
						$js = "opener.location.search += (opener.location.search?'&msg=':'?msg=')+'".
							addslashes($msg)."';";
					}
					else
					{
						$msg = lang('Error adding the alarm');
					}
				}
				else
				{
					for($alarm['id']=1; isset($event['alarm'][$alarm['id']]); $alarm['id']++);	// get a temporary non-conflicting, numeric id
					$event['alarm'][$alarm['id']] = $alarm;
				}
			}
			else
			{
				$msg = lang('Permission denied');
			}
			break;
		}
		if (in_array($button,array('cancel','save','delete','delete_exceptions','delete_keep_exceptions')) && $noerror)
		{
			if ($content['lock_token'])	// remove an existing lock
			{
				egw_vfs::unlock(egw_vfs::app_entry_lock_path('calendar',$content['id']),$content['lock_token'],false);
			}
			if ($content['no_popup'])
			{
				egw::redirect_link('/index.php',array(
					'menuaction' => 'calendar.calendar_uiviews.index',
					'msg'        => $msg,
				));
			}
			$js .= 'window.close();';
			echo "<html><body onload=\"$js\"></body></html>\n";
			common::egw_exit();
		}
		unset($event['no_notifications']);
		return $this->edit($event,$preserv,$msg,$js,$event['id'] ? $event['id'] : $content['link_to']['to_id']);
	}

	/**
	 * Create an exception from the clicked event
	 *
	 * It's not stored to the DB unless the user saves it!
	 *
	 * @param array &$event
	 * @param array &$preserv
	 * @return string message that exception was created
	 */
	function _create_exception(&$event,&$preserv)
	{
		$event['end'] += $preserv['actual_date'] - $event['start'];
		$event['reference'] = $preserv['reference'] = $event['id'];
		$event['recurrence'] = $preserv['recurrence'] = $preserv['actual_date'];
		$event['start'] = $preserv['edit_single'] = $preserv['actual_date'];
		$event['recur_type'] = MCAL_RECUR_NONE;
		foreach(array('recur_enddate','recur_interval','recur_exception','recur_data') as $name)
		{
			unset($event[$name]);
		}
		if($this->bo->check_perms(EGW_ACL_EDIT,$event))
		{
			return lang('Save event as exception - Delete single occurrence - Edit status or alarms for this particular day');
		}
		return lang('Edit status or alarms for this particular day');
	}

	/**
	 * return javascript to open felamimail compose window with preset content to mail all participants
	 *
	 * @param array $event
	 * @param boolean $added
	 * @return string javascript window.open command
	 */
	function custom_mail($event,$added,$asrequest=false)
	{
		$to = array();

		foreach($event['participants'] as $uid => $status)
		{
			$toadd = '';
			if ($status == 'R' || $uid == $this->user) continue;

			if (is_numeric($uid) && $GLOBALS['egw']->accounts->get_type($uid) == 'u')
			{
				if (!($email = $GLOBALS['egw']->accounts->id2name($uid,'account_email'))) continue;

				$GLOBALS['egw']->accounts->get_account_name($uid,$lid,$firstname,$lastname);

				$toadd = $firstname.' '.$lastname.' <'.$email.'>';
				if (!in_array($toadd,$to)) $to[] = $toadd;
			}
			elseif ($uid < 0)
			{
				foreach($GLOBALS['egw']->accounts->members($uid,true) as $uid)
				{
					if (!($email = $GLOBALS['egw']->accounts->id2name($uid,'account_email'))) continue;

					$GLOBALS['egw']->accounts->get_account_name($uid,$lid,$firstname,$lastname);

					$toadd = $firstname.' '.$lastname.' <'.$email.'>';
					// dont add groupmembers if they already rejected the event, or are the current user
					if (!in_array($toadd,$to) && ($event['participants'][$uid] !== 'R' && $uid != $this->user)) $to[] = $toadd;
				}
			}
			elseif(($info = $this->bo->resource_info($uid)))
			{
				$to[] = $info['email'];
			}
		}
		list($subject,$body) = $this->bo->get_update_message($event,$added ? MSG_ADDED : MSG_MODIFIED);	// update-message is in TZ of the user
		#error_log(__METHOD__.print_r($event,true));
		$boical = new calendar_ical();
		$ics = $boical->exportVCal(array($event),'2.0','request',false);

		$ics_file = tempnam($GLOBALS['egw_info']['server']['temp_dir'],'ics');
		if(($f = fopen($ics_file,'w')))
		{
			fwrite($f,$ics);
			fclose($f);
		}
		$vars = array(
			'menuaction'      => 'felamimail.uicompose.compose',
			'mimeType'		  => 'plain', // force type to plain as thunderbird seems to try to be smart while parsing html messages with ics attachments
			'preset[to]'      => $to,
			'preset[subject]' => $subject,
			'preset[body]'    => $body,
			'preset[name]'    => 'event.ics',
			'preset[file]'    => $ics_file,
			'preset[type]'    => 'text/calendar'.($asrequest?'; method=request':''),
			'preset[size]'    => filesize($ics_file),
		);
		if ($asrequest) $vars['preset[msg]'] = lang('You attempt to mail a meetingrequest to the recipients above. Depending on the client this mail is opened with, the recipient may or may not see the mailbody below, but only see the meeting request attached.');
		return "window.open('".egw::link('/index.php',$vars)."','_blank','width=700,height=700,scrollbars=yes,status=no');";
	}

	/**
	 * return javascript to open compose window to print the event
	 *
	 * @param array $event
	 * @param boolean $added
	 * @return string javascript window.open command
	 */
	function custom_print($event,$added)
	{
			$vars = array(
			'menuaction'      => 'calendar.calendar_uiforms.edit',
			'cal_id'      => $event['id'],
			'print' => true,
			);
		return "window.open('".egw::link('/index.php',$vars)."','_blank','width=700,height=700,scrollbars=yes,status=no');";
	}


	/**
	 * Edit a calendar event
	 *
	 * @param array $event=null Event to edit, if not $_GET['cal_id'] contains the event-id
	 * @param array $perserv=null following keys:
	 *	view boolean view-mode, if no edit-access we automatic fallback to view-mode
	 *	hide_delete boolean hide delete button
	 *	no_popup boolean use a popup or not
	 *	edit_single int timestamp of single event edited, unset/null otherwise
	 * @param string $msg='' msg to display
	 * @param string $js='window.focus();' javascript to include in the page
	 * @param mixed $link_to_id='' $content from or for the link-widget
	 */
	function edit($event=null,$preserv=null,$msg='',$js = 'window.focus();',$link_to_id='')
	{
		$sel_options = array(
			'recur_type' => &$this->bo->recur_types,
			'status'     => $this->bo->verbose_status,
			'duration'   => $this->durations,
			'role'       => $this->bo->roles,
			'before_after'=>array(0 => lang('Before'), 1 => lang('After')),
			'action'     => array(
				'copy' => array('label' => 'Copy', 'title' => 'Copy this event'),
				'ical' => array('label' => 'Export', 'title' => 'Download this event as iCal'),
				'print' => array('label' => 'Print', 'title' => 'Print this event'),
				'mail' => array('label' => 'Mail all participants', 'title' => 'compose a mail to all participants after the event is saved'),
				'sendrequest' => array('label' => 'Send meetingrequest to all participants', 'title' => 'Send meetingrequest to all participants after the event is saved'),
			),
		);
		unset($sel_options['status']['G']);
		if (!is_array($event))
		{
			$preserv = array(
				'no_popup' => isset($_GET['no_popup']),
				'template' => isset($_GET['template']) ? $_GET['template'] : (isset($_REQUEST['print']) ? 'calendar.print' : 'calendar.edit'),
			);
			$cal_id = (int) $_GET['cal_id'];
			if (!empty($_GET['ical']) || !empty($_GET['ical_vfs']) && egw_vfs::file_exists($_GET['ical_vfs']))
			{
				$ical = new calendar_ical();
				$ical_string = !empty($_GET['ical']) ? $_GET['ical'] : file_get_contents(egw_vfs::PREFIX.$_GET['ical_vfs']);
				if (!($events = $ical->icaltoegw($ical_string, '', 'utf-8')) || count($events) != 1)
				{
					error_log(__METHOD__."('$_GET[ical]') error parsing iCal!");
					$msg = lang('Error: importing the iCal');
					$event =& $this->default_add_event();
				}
				else
				{
					$event = array_shift($events);
					if (($existing_event = $this->bo->read($event['uid'])))
					{
						$event = $existing_event;
					}
					else
					{
						$event['participant_types'] = array();
						foreach($event['participants'] as $uid => $status)
						{
							calendar_so::split_user($uid, $user_type, $user_id);
							$event['participant_types'][$user_type][$user_id] = $status;
						}
					}
					//error_log(__METHOD__."(...) parsed as ".array2string($event));
				}
				unset($ical);
				unset($ical_string);
			}
			elseif (!$cal_id || $cal_id && !($event = $this->bo->read($cal_id)))
			{
				if ($cal_id)
				{
					if (!$preserv['no_popup'])
					{
						$js = "alert('".lang('Permission denied')."'); window.close();";
					}
					else
					{
						$GLOBALS['egw']->framework->render('<p class="redItalic" align="center">'.lang('Permission denied')."</p>\n",null,true);
						common::egw_exit();
					}
				}
				$event =& $this->default_add_event();
			}
			else
			{
				$preserv['actual_date'] = $event['start'];		// remember the date clicked
				if ($event['recur_type'] != MCAL_RECUR_NONE)
				{
					if (empty($event['whole_day']))
					{
						$date = $_GET['date'];
					}
					else
					{
						$date = new egw_time($_GET['date'], egw_time::$user_timezone);
						$date =& $this->bo->so->startOfDay($date);
						$date->setUser();
					}
					$event = $this->bo->read($cal_id, $date, true);
					$preserv['actual_date'] = $event['start'];		// remember the date clicked
					if ($_GET['exception'])
					{
						$msg = $this->_create_exception($event,$preserv);
					}
					else
					{
						$event = $this->bo->read($cal_id, null, true);
					}
				}
			}
			// set new start and end if given by $_GET
			if(isset($_GET['start'])) { $event['start'] = $_GET['start']; }
			if(isset($_GET['end'])) { $event['end'] = $_GET['end']; }
			// check if the event is the whole day
			$start = $this->bo->date2array($event['start']);
			$end = $this->bo->date2array($event['end']);
			$event['whole_day'] = !$start['hour'] && !$start['minute'] && $end['hour'] == 23 && $end['minute'] == 59;

			$link_to_id = $event['id'];
			if (!$add_link && !$event['id'] && isset($_REQUEST['link_app']) && isset($_REQUEST['link_id']))
			{
				$link_ids = is_array($_REQUEST['link_id']) ? $_REQUEST['link_id'] : array($_REQUEST['link_id']);
				foreach(is_array($_REQUEST['link_app']) ? $_REQUEST['link_app'] : array($_REQUEST['link_app']) as $n => $link_app)
				{
					$link_id = $link_ids[$n];
					$app_entry = array();
					if(!preg_match('/^[a-z_0-9-]+:[:a-z_0-9-]+$/i',$link_app.':'.$link_id))	// guard against XSS
					{
						continue;
					}
					if(!$n)
					{
						$event['title'] = egw_link::title($link_app,$link_id);
						// ask first linked app via "calendar_set" hook, for further data to set, incl. links
						if (($set = $GLOBALS['egw']->hooks->single($event+array('location'=>'calendar_set','entry_id'=>$link_id),$link_app)))
						{
							foreach((array)$set['link_app'] as $i => $l_app)
							{
								if (($l_id=$set['link_id'][$i])) egw_link::link('calendar',$content['link_to']['to_id'],$l_app,$l_id);
							}
							unset($set['link_app']);
							unset($set['link_id']);

							$event = array_merge($event,$set);
						}
					}
					egw_link::link('calendar',$link_to_id,$link_app,$link_id);
				}
			}
		}
		$etpl = new etemplate();
		if (!$etpl->read($preserv['template']))
		{
			$etpl->read($preserv['template'] = 'calendar.edit');
		}
		$view = $preserv['view'] = $preserv['view'] || $event['id'] && !$this->bo->check_perms(EGW_ACL_EDIT,$event);
		//echo "view=$view, event="; _debug_array($event);
		// shared locking of entries to edit
		if (!$view && ($locktime = $GLOBALS['egw_info']['server']['Lock_Time_Calender']) && $event['id'])
		{
			$lock_path = egw_vfs::app_entry_lock_path('calendar',$event['id']);
			$lock_owner = 'mailto:'.$GLOBALS['egw_info']['user']['account_email'];

			if (($preserv['lock_token'] = $content['lock_token']))		// already locked --> refresh the lock
			{
				egw_vfs::lock($lock_path,$preserv['lock_token'],$locktime,$lock_owner,$scope='shared',$type='write',true,false);
			}
			if (($lock = egw_vfs::checkLock($lock_path)) && $lock['owner'] != $lock_owner)
			{
				$msg .= ' '.lang('This entry is currently opened by %1!',
					(($lock_uid = $GLOBALS['egw']->accounts->name2id(substr($lock['owner'],7),'account_email')) ?
					common::grab_owner_name($lock_uid) : $lock['owner']));
			}
			elseif($lock)
			{
				$preserv['lock_token'] = $lock['token'];
			}
			elseif(egw_vfs::lock($lock_path,$preserv['lock_token'],$locktime,$lock_owner,$scope='shared',$type='write',false,false))
			{
                // install ajax handler to unlock the entry again, if the window get's closed by the user (X of window or our [Close] button)
                $GLOBALS['egw']->js->set_onunload("if (do_onunload) xajax_doXMLHTTPsync('calendar.calendar_uiforms.ajax_unlock',$event[id],'$preserv[lock_token]');");
                $GLOBALS['egw']->js->set_onload("replace_eTemplate_onsubmit();");

                // overwrite submit method of eTemplate form AND onSubmit event, to switch off onUnload handler for regular form submits
                // selectboxes use onchange(this.form.submit()) which does not fire onSubmit event --> need to overwrite submit() method
                // regular submit buttons dont call submit(), but trigger onSubmit event --> need to overwrite onSubmit event
                $GLOBALS['egw_info']['flags']['java_script'] .= '
<script>
var do_onunload = true;
function replace_eTemplate_onsubmit()
{
    document.eTemplate.old_submit = document.eTemplate.submit;
    document.eTemplate.submit = function()
    {
        do_onunload = false;
        this.old_submit();
    }
    document.eTemplate.old_onsubmit = document.eTemplate.onsubmit;
    document.eTemplate.onsubmit = function()
    {
        do_onunload = false;
        this.old_onsubmit();
    }
}
</script>
';
			}
			else
			{
				$msg .= ' '.lang("Can't aquire lock!");		// eg. an exclusive lock via CalDAV ...
				$view = true;
			}
			//echo "<p>lock_path=$lock_path, lock_owner=$lock_owner, lock_token=$preserv[lock_token], msg=$msg</p>\n";
		}
		$content = array_merge($event,array(
			'link_to' => array(
				'to_id'  => $link_to_id,
				'to_app' => 'calendar',
			),
			'edit_single' => $preserv['edit_single'],	// need to be in content too, as it is used in the template
			'tabs'   => $preserv['tabs'],
			'view' => $view,
			'msg' => $msg,
			'query_delete_exceptions' => (int)($event['recur_type'] && $event['recur_exception']),
		));
		$content['duration'] = $content['end'] - $content['start'];
		if (isset($this->durations[$content['duration']])) $content['end'] = '';

		$row = 2;
		$readonlys = $content['participants'] = $preserv['participants'] = array();
		// preserve some ui elements, if set eg. under error-conditions
		foreach(array('quantity','resource','role') as $n)
		{
			if (isset($event['participants'][$n])) $content['participants'][$n] = $event['participants'][$n];
		}
		foreach($event['participant_types'] as $type => $participants)
		{
			$name = 'accounts';
			if (isset($this->bo->resources[$type]))
			{
				$name = $this->bo->resources[$type]['app'];
			}
			foreach($participants as $id => $status)
			{
				$uid = $type == 'u' ? $id : $type.$id;
				calendar_so::split_status($status,$quantity,$role);
				$preserv['participants'][$row] = $content['participants'][$row] = array(
					'app'      => $name == 'accounts' ? ($GLOBALS['egw']->accounts->get_type($id) == 'g' ? 'Group' : 'User') : $name,
					'uid'      => $uid,
					'status'   => $status,
					'old_status' => $status,
					'quantity' => $quantity > 1 || $uid[0] == 'r' ? $quantity : '',	// only display quantity for resources or if > 1
					'role'     => $role,
				);
				// replace iCal roles with a nicer label and remove regular REQ-PARTICIPANT
				if (isset($this->bo->roles[$role]))
				{
					$content['participants'][$row]['role_label'] = lang($this->bo->roles[$role]);
				}
				// allow third party apps to use categories for roles
				elseif(substr($role,0,6) == 'X-CAT-')
				{
					$content['participants'][$row]['role_label'] = $GLOBALS['egw']->categories->id2name(substr($role,6));
				}
				else
				{
					$content['participants'][$row]['role_label'] = lang(str_replace('X-','',$role));
				}
				$content['participants'][$row]['delete_id'] = strpbrk($uid,'"\'<>') !== false ? md5($uid) : $uid;
				//echo "<p>$uid ($quantity): $role --> {$content['participants'][$row]['role']}</p>\n";
				$readonlys[$row.'[status]'] = !$this->bo->check_status_perms($uid,$event);
				$readonlys["delete[$uid]"] = $preserv['hide_delete'] || !$this->bo->check_perms(EGW_ACL_EDIT,$event);
				// todo: make the participants available as links with email as title
				if ($name == 'accounts')
				{
					$content['participants'][$row++]['title'] = common::grab_owner_name($id);
				}
				elseif (($info = $this->bo->resource_info($uid)))
				{
					$content['participants'][$row++]['title'] = $info['name'] ? $info['name'] : $info['email'];
				}
				else
				{
					$content['participants'][$row++]['title'] = '#'.$uid;
				}
				// enumerate group-invitations, so people can accept/reject them
				if ($name == 'accounts' && $GLOBALS['egw']->accounts->get_type($id) == 'g' &&
					($members = $GLOBALS['egw']->accounts->members($id,true)))
				{
					$sel_options['status']['G'] = lang('Select one');
					foreach($members as $member)
					{
						if (!isset($participants[$member]) && $this->bo->check_perms(EGW_ACL_READ,0,$member))
						{
							$preserv['participants'][$row] = $content['participants'][$row] = array(
								'app'      => 'Group invitation',
								'uid'      => $member,
								'status'   => 'G',
							);
							$readonlys[$row.'[quantity]'] = $readonlys["delete[$member]"] = true;
							// read access is enough to invite participants, but you need edit rights to change status
							$readonlys[$row.'[status]'] = !$this->bo->check_perms(EGW_ACL_EDIT,0,$member);
							$content['participants'][$row++]['title'] = common::grab_owner_name($member);
						}
					}
				}
			}
			// resouces / apps we shedule, atm. resources and addressbook
			$content['participants']['cal_resources'] = '';
			foreach($this->bo->resources as $data)
			{
				$content['participants']['cal_resources'] .= ','.$data['app'];
			}
			// adding extra content for the resource link-entry widget to
			// * select resources or addressbook as a default selection on the app selectbox based on prefs
			$content['participants']['resource']['default_sel'] = $this->cal_prefs['defaultresource_sel'];
			// * get informations from the event on the ajax callback
			if (in_array($content['participants']['resource']['default_sel'],array('resources_conflict','resources_without_conflict')))
			{
				// fix real app string
				$content['participants']['resource']['default_sel'] = 'resources';
				// this will be used to get reservation information on the resource select list
				$content['participants']['resource']['extra'] = "values2url(this.form,'start,end,duration,participants,recur_type,whole_day')".
					"+'&exec[event_id]=".$content['id']."'"."+'&exec[show_conflict]=".
					(($this->cal_prefs['defaultresource_sel'] == 'resources_without_conflict')? '0':'1')."'";
			}
		}
		$content['participants']['status_date'] = $preserv['actual_date'];
		$preserv = array_merge($preserv,$content);

		if ($event['alarm'])
		{
			// makes keys of the alarm-array starting with 1
			$content['alarm'] = array(false);
			if (!$content['edit_single'])
			{
				foreach(array_values($event['alarm']) as $id => $alarm)
				{
					if (!$alarm['all'] && !$this->bo->check_perms(EGW_ACL_READ,0,$alarm['owner']))
					{
						continue;	// no read rights to the calendar of the alarm-owner, dont show the alarm
					}
					$alarm['all'] = (int) $alarm['all'];
					$after = false;
					if($alarm['offset'] < 0)
					{
						$after = true;
						$alarm['offset'] = -1 * $alarm['offset'];
					}
					$days = (int) ($alarm['offset'] / DAY_s);
					$hours = (int) (($alarm['offset'] % DAY_s) / HOUR_s);
					$minutes = (int) (($alarm['offset'] % HOUR_s) / 60);
					$label = array();
					if ($days) $label[] = $days.' '.lang('days');
					if ($hours) $label[] = $hours.' '.lang('hours');
					if ($minutes) $label[] = $minutes.' '.lang('Minutes');
					$alarm['offset'] = implode(', ',$label) . ' ' . ($after ? lang('after') : lang('before'));
					$content['alarm'][] = $alarm;

					$readonlys['delete_alarm['.$alarm['id'].']'] = !$this->bo->check_perms(EGW_ACL_EDIT,$alarm['all'] ? $event : 0,$alarm['owner']);
				}
			}
			else
			{
				// hide the alarm tab for newly created exceptions
				$readonlys['tabs']['alarms'] = true;

				// disable the alarm tab functionality
				$readonlys['button[add_alarm]'] = true;
				$readonlys['new_alarm[days]'] = true;
				$readonlys['new_alarm[hours]'] = true;
				$readonlys['new_alarm[mins]'] = true;
				$readonlys['new_alarm[owner]'] = true;
			}
			if (count($content['alarm']) == 1)
			{
				$content['alarm'] = false; // no alarms added to content array
			}
		}
		else
		{
			$content['alarm'] = false;
		}
		$content['msg'] = $msg;

		if ($view)
		{
			$readonlys['__ALL__'] = true;	// making everything readonly, but widgets set explicitly to false
			$readonlys['alarm'] = $readonlys['button[cancel]'] = $readonlys['action'] =
				$readonlys['before_after'] = $readonlys['button[add_alarm]'] = $readonlys['new_alarm[owner]'] =
				$readonlys['new_alarm[days]'] = $readonlys['new_alarm[hours]'] = $readonlys['new_alarm[mins]'] = false;

			$content['participants']['no_add'] = true;

			// respect category permissions
			if(!empty($event['category']))
			{
				$content['category'] = $this->categories->check_list(EGW_ACL_READ, $event['category']);
			}
		}
		else
		{
			//Add the check_recur_type function to onload, which disables recur_data function
			//if recur_type is not repeat weekly.
			$onload = "check_recur_type('recur_type',2);";
			// We hide the enddate if one of our predefined durations fits
			// the call to set_style_by_class has to be in onload, to make sure the function and the element is already created
			$onload .= " set_style_by_class('table','end_hide','display','".($content['duration'] && isset($sel_options['duration'][$content['duration']]) ? 'none' : 'block')."');";

			$GLOBALS['egw']->js->set_onload($onload);

			$readonlys['recur_exception'] = true;

			if ($event['recur_type'] != MCAL_RECUR_NONE)
			{
				$readonlys['recur_exception'] = !count($content['recur_exception']);	// otherwise we get a delete button
				$onclick =& $etpl->get_cell_attribute('button[delete]','onclick');
				$onclick = str_replace('Delete this event','Delete this series of recuring events',$onclick);
			}
			elseif ($event['reference'] != 0)
			{
				$readonlys['recur_type'] = $readonlys['recur_enddate'] = true;
				$readonlys['recur_interval'] = $readonlys['recur_data'] = true;
			}
		}
		// disabling the custom fields tab, if there are none
		$readonlys['tabs'] = array(
			'custom' => !count($this->bo->config['customfields']),
			'participants' => $this->accountsel->account_selection == 'none',
		);
		if (!isset($GLOBALS['egw_info']['user']['apps']['felamimail']))	// no mail without mail-app
		{
			unset($sel_options['action']['mail']);
			unset($sel_options['action']['sendmeetingrequest']);
		}
		if (!$event['id'])	// no ical export for new (not saved) events
		{
			$readonlys['action'] = true;
		}
		if (!($readonlys['button[exception]'] = !$this->bo->check_perms(EGW_ACL_EDIT,$event) || $event['recur_type'] == MCAL_RECUR_NONE))
		{
			$content['exception_label'] = $this->bo->long_date($preserv['actual_date']);
		}
		$readonlys['button[delete]'] = !$event['id'] || $preserv['hide_delete'] || !$this->bo->check_perms(EGW_ACL_DELETE,$event);

		if (!$event['id'] || $this->bo->check_perms(EGW_ACL_EDIT,$event))	// new event or edit rights to the event ==> allow to add alarm for all users
		{
			$sel_options['owner'][0] = lang('All participants');
		}
		if (isset($event['participant_types']['u'][$this->user]))
		{
			$sel_options['owner'][$this->user] = $this->bo->participant_name($this->user);
		}
		foreach((array) $event['participant_types']['u'] as $uid => $status)
		{
			if ($uid != $this->user && $status != 'R' && $this->bo->check_perms(EGW_ACL_EDIT,0,$uid))
			{
				$sel_options['owner'][$uid] = $this->bo->participant_name($uid);
			}
		}
		$content['no_add_alarm'] = !count($sel_options['owner']);	// no rights to set any alarm
		if (!$event['id'])
		{
			$etpl->set_cell_attribute('button[new_alarm]','type','checkbox');
		}
		if ($preserv['no_popup'])
		{
			$etpl->set_cell_attribute('button[cancel]','onclick','');
		}

		// Allow admins to restore deleted events
		if($GLOBALS['egw_info']['server']['calendar_delete_history'] && $event['deleted'] )
		{
			$content['deleted'] = $preserv['deleted'] = null;
			$etpl->set_cell_attribute('button[save]', 'label', 'Recover');
			$etpl->set_cell_attribute('button[apply]', 'disabled', true);
		}
		// Allow users to prevent notifications?
		$etpl->set_cell_attribute('no_notifications', 'disabled', !$GLOBALS['egw_info']['server']['calendar_allow_no_notification']);

		// Setup history tab
		$this->setup_history($content, $sel_options);

		//echo "content="; _debug_array($content);
		//echo "preserv="; _debug_array($preserv);
 		//echo "readonlys="; _debug_array($readonlys);
 		//echo "sel_options="; _debug_array($sel_options);
		$GLOBALS['egw_info']['flags']['app_header'] = lang('calendar') . ' - '
			. (!$event['id'] ? lang('Add')
				: ($view ? ($content['edit_single'] ? lang('View exception') : ($content['recur_type'] ? lang('View series') : lang('View')))
					: ($content['edit_single'] ? lang('Create exception') : ($content['recur_type'] ? lang('Edit series') : lang('Edit')))));

		//Function for disabling the recur_data multiselect box
		$js .=
			"\nfunction check_recur_type(_id, _ind)\n{\negw_set_checkbox_multiselect_enabled('recur_data',".
			"document.getElementById('exec['+_id+']').selectedIndex == _ind);\n}\n";

		$GLOBALS['egw_info']['flags']['java_script'] .= "<script>\n$js\n</script>\n";

		$content['cancel_needs_refresh'] = (bool)$_GET['cancel_needs_refresh'];

		// non_interactive==true from $_GET calls immediate save action without displaying the edit form
		if(isset($_GET['non_interactive']) && (bool)$_GET['non_interactive'] === true)
		{
			unset($_GET['non_interactive']);	// prevent process_exec <--> edit loops
			$content['button']['save'] = true;
			$this->process_edit(array_merge($content,$preserv));
		}
		else
		{
			$etpl->exec('calendar.calendar_uiforms.process_edit',$content,$sel_options,$readonlys,$preserv,$preserv['no_popup'] ? 0 : 2);
		}
	}

	/**
	 * Remove (shared) lock via ajax, when edit popup get's closed
	 *
	 * @param int $id
	 * @param string $token
	 */
	function ajax_unlock($id,$token)
	{
		$lock_path = egw_vfs::app_entry_lock_path('calendar',$id);
		$lock_owner = 'mailto:'.$GLOBALS['egw_info']['user']['account_email'];

		if (($lock = egw_vfs::checkLock($lock_path)) && $lock['owner'] == $lock_owner || $lock['token'] == $token)
		{
			egw_vfs::unlock($lock_path,$token,false);
		}
		$response = new xajaxResponse();
		$response->addScript('window.close();');
		return $response->getXML();
	}

	/**
	 * Display a meeting request (iCal) for FMail and allow to accept, tentative or reject it
	 *
	 * @todo Handle situation when user is NOT invited, but eg. can view that mail ...
	 * @param array $event=null
	 * @param string $msg=''
	 */
	function meeting(array $event=null, $msg='')
	{
		$user = $GLOBALS['egw_info']['user']['account_id'];

		if (!is_array($event))
		{
			$ical_charset = 'utf-8';
			$ical_string = $_GET['ical'];
			if ($ical_string == 'session')
			{
				$session_data = egw_cache::getSession('calendar', 'ical');
				$ical_string = $session_data['attachment'];
				$ical_charset = $session_data['charset'];
				unset($session_data);
			}
			$ical = new calendar_ical();
			if (!($events = $ical->icaltoegw($ical_string, '', $ical_charset)) || count($events) != 1)
			{
				error_log(__METHOD__."('$_GET[ical]') error parsing iCal!");
				$GLOBALS['egw']->framework->render(html::fieldset('<pre>'.htmlspecialchars($ical_string).'</pre>',
					lang('Error: importing the iCal')));
				return;
			}
			$event = array_shift($events);
			if (($existing_event = $this->bo->read($event['uid'])) && !$existing_event['deleted'])
			{
				$event = $existing_event;
				foreach((array)$event['participants'] as $uid => $status)
				{
					calendar_so::split_status($status, $quantity, $role);
					if ($role == 'CHAIR')
					{
						$event['organizer'] = $this->bo->participant_name($uid,false,true);
						break;
					}
				}
				if (empty($event['organizer']))
				{
					$event['organizer'] = $this->bo->participant_name($event['owner'],false,true);
				}
				$msg = lang('Using already existing event on server.');
			}
			else
			{
				$event['participant_types'] = array();
				foreach($event['participants'] as $uid => $status)
				{
					calendar_so::split_user($uid, $user_type, $user_id);
					$event['participant_types'][$user_type][$user_id] = $status;
				}
			}
			//error_log(__METHOD__."(...) parsed as ".array2string($event));
			$event['recure'] = $this->bo->recure2string($event);
			$event['all_participants'] = implode(",\n",$this->bo->participants($event, true));

			if (!isset($event['participants'][$user]))
			{
				$msg .= ($msg ? "\n" : '').lang('You are not invited to that event!');
				if ($event['id'])
				{
					$readonlys['button[accept]'] = $readonlys['button[tentativ]'] = $readonlys['button[reject]'] = true;
				}
			}
			// ignore events in the past
			if ($this->bo->date2ts($event['start']) < $this->bo->now_su)
			{
				$msg = lang('Requested meeting is in the past!');
				$readonlys['button[accept]'] = $readonlys['button[tentativ]'] = $readonlys['button[reject]'] = true;
			}
		}
		else
		{
			//_debug_array($event);
			list($button) = each($event['button']);
			unset($event['button']);

			switch($button)
			{
				case 'reject':
					if (!$event['id'])
					{
						// send reply to organizer
						$this->bo->send_update(MSG_REJECTED,array('e'.$event['organizer'] => 'DCHAIR'),$event);
						break;	// no need to store rejected event
					}
					// fall-through
				case 'accept':
				case 'tentativ':
					$status = strtoupper($button[0]);	// A, R or T
					if (!$event['id'])
					{
						// store event without notifications!
						if (($event['id'] = $this->bo->update($event, $ignore_conflicts=true, true, false, true, $msg, true)))
						{
							$msg = lang('Event saved');
						}
						else
						{
							$msg = lang('Error: saving the event !!!');
							break;
						}
					}
					// set status and send notification / meeting response
					if ($this->bo->set_status($event, $user, $status))
					{
						if (!$msg) $msg = lang('Status changed');
					}
					break;
			}
		}
		$event['msg'] = $msg;
		$readonlys['button[edit]'] = !$event['id'];

		$tpl = new etemplate('calendar.meeting');
		$tpl->exec('calendar.calendar_uiforms.meeting', $event, $sel_options, $readonlys, $event, 2);
	}

	/**
	 * displays a sheduling conflict
	 *
	 * @param array $event
	 * @param array $conflicts array with conflicting events, the events are not garantied to be readable by the user!
	 * @param array $preserv data to preserv
	 */
	function conflicts($event,$conflicts,$preserv)
	{
		$etpl = CreateObject('etemplate.etemplate','calendar.conflicts');

		foreach($conflicts as $k => $conflict)
		{
			$is_readable = $this->bo->check_perms(EGW_ACL_READ,$conflict);

			$conflicts[$k] += array(
				'icon_participants' => $is_readable ? (count($conflict['participants']) > 1 ? 'users' : 'single') : 'private',
				'tooltip_participants' => $is_readable ? implode(', ',$this->bo->participants($conflict)) : '',
				'time' => $this->bo->long_date($conflict['start'],$conflict['end'],true),
				'conflicting_participants' => implode(",\n",$this->bo->participants(array(
					'participants' => array_intersect_key($conflict['participants'],$event['participants']),
				),true,true)),	// show group invitations too
				'icon_recur' => $conflict['recur_type'] != MCAL_RECUR_NONE ? 'recur' : '',
				'text_recur' => $conflict['recur_type'] != MCAL_RECUR_NONE ? lang('Recurring event') : ' ',
			);
		}
		$content = $event + array(
			'conflicts' => array_values($conflicts),	// conflicts have id-start as key
		);
		$GLOBALS['egw_info']['flags']['app_header'] = lang('calendar') . ' - ' . lang('Scheduling conflict');

		$etpl->exec('calendar.calendar_uiforms.process_edit',$content,false,false,array_merge($event,$preserv),$preserv['no_popup'] ? 0 : 2);
	}

	/**
	 * displays a confirmation window for changed start dates of series events
	 *
	 * @param array $event
	 * @param array $preserv data to preserv
	 */
	function confirm_edit_series($event,$preserv)
	{
		$etpl = CreateObject('etemplate.etemplate','calendar.confirm_edit_series');

		$GLOBALS['egw_info']['flags']['app_header'] = lang('calendar') . ' - ' . lang('Start of Series Event Changed');

		$etpl->exec('calendar.calendar_uiforms.process_edit',$content,false,false,array_merge($event,$preserv),$preserv['no_popup'] ? 0 : 2);
	}

	/**
	 * Callback for freetimesearch button in edit
	 *
	 * It stores the data of the submitted form in the session under 'freetimesearch_args_'.$edit_content['id'],
	 * for later retrival of the freetimesearch method, called by the returned window.open() command.
	 *
	 * @param array $edit_content
	 * @return string with xajaxResponse
	 */
	function ajax_freetimesearch(array $edit_content)
	{
		$response = new xajaxResponse();
		//$response->addAlert(__METHOD__.'('.array2string($edit_content).')');

		if ($edit_content['duration'])
		{
			$edit_content['end'] = $edit_content['start'] + $edit_content['duration'];
		}
		if ($edit_content['whole_day'])
		{
			$arr = $this->bo->date2array($edit_content['start']);
			$arr['hour'] = $arr['minute'] = $arr['second'] = 0; unset($arr['raw']);
			$edit_content['start'] = $this->bo->date2ts($arr);
			$arr = $this->bo->date2array($edit_content['end']);
			$arr['hour'] = 23; $arr['minute'] = $arr['second'] = 59; unset($arr['raw']);
			$edit_content['end'] = $this->bo->date2ts($arr);
		}
		$content = array(
			'start'    => $edit_content['start'],
			'duration' => $edit_content['end'] - $edit_content['start'],
			'end'      => $edit_content['end'],
			'cal_id'   => $edit_content['id'],
			'recur_type'   => $edit_content['recur_type'],
			'participants' => array(),
		);
		foreach($edit_content['participants'] as $key => $data)
		{
			if (is_numeric($key) && !$edit_content['participants']['delete'][$data['uid']] &&
				!$edit_content['participants']['delete'][md5($data['uid'])])
			{
				$content['participants'][] = $data['uid'];
			}
			elseif ($key == 'account' && !is_array($data) && $data)
			{
				$content['participants'][] = $data;
			}
		}
		// default search parameters
		$content['start_time'] = $edit_content['whole_day'] ? 0 : $this->cal_prefs['workdaystarts'];
		$content['end_time'] = $this->cal_prefs['workdayends'];
		if ($this->cal_prefs['workdayends']*HOUR_s < $this->cal_prefs['workdaystarts']*HOUR_s+$content['duration'])
		{
			$content['end_time'] = 0;	// no end-time limit, as duration would never fit
		}
		$content['weekdays'] = MCAL_M_WEEKDAYS;

		$content['search_window'] = 7 * DAY_s;

		// store content in session
		egw_cache::setSession('calendar','freetimesearch_args_'.(int)$edit_content['id'],$content);

		//menuaction=calendar.calendar_uiforms.freetimesearch&values2url('start,end,duration,participants,recur_type,whole_day'),ft_search,700,500
		$link = egw::link('/index.php',array(
			'menuaction' => 'calendar.calendar_uiforms.freetimesearch',
			'cal_id'     => $edit_content['id'],
		));

		$response->addScriptCall('egw_openWindowCentered2',$link,'ft_search',700,500);

		return $response->getXML();
	}

	/**
	 * Freetime search
	 *
	 * As the function is called in a popup via javascript, parametes get initialy transfered via the url
	 * @param array $content=null array with parameters or false (default) to use the get-params
	 * @param string start[str] start-date
	 * @param string start[hour] start-hour
	 * @param string start[min] start-minutes
	 * @param string end[str] end-date
	 * @param string end[hour] end-hour
	 * @param string end[min] end-minutes
	 * @param string participants ':' delimited string of user-id's
	 */
	function freetimesearch($content = null)
	{
		$etpl = new etemplate('calendar.freetimesearch');

		$sel_options['search_window'] = array(
			7*DAY_s		=> lang('one week'),
			14*DAY_s	=> lang('two weeks'),
			31*DAY_s	=> lang('one month'),
			92*DAY_s	=> lang('three month'),
			365*DAY_s	=> lang('one year'),
		);
		if (!is_array($content))
		{
			// get content from session (and delete it immediatly)
			$content = egw_cache::getSession('calendar','freetimesearch_args_'.(int)$_GET['cal_id']);
			egw_cache::unsetSession('calendar','freetimesearch_args_'.(int)$_GET['cal_id']);

			// pick a searchwindow fitting the duration (search for a 10 day slot in a one week window never succeeds)
			foreach($sel_options['search_window'] as $window => $label)
			{
				if ($window > $content['duration'])
				{
					$content['search_window'] = $window;
					break;
				}
			}
		}
		else
		{
			if (!$content['duration']) $content['duration'] = $content['end'] - $content['start'];

			if (is_array($content['freetime']['select']))
			{
				list($selected) = each($content['freetime']['select']);
				//echo "$selected = ".date('D d.m.Y H:i',$content['freetime'][$selected]['start']);
				$start = (int) $content['freetime'][$selected]['start'];
				$end = $start + $content['duration'];
				/**
				 * ToDo: make this an eTemplate function to transmit content back to the opener
				 */
				$fields_to_set = array(
					'exec[start][str]'	=> date($this->common_prefs['dateformat'],$start),
					'exec[start][i]'	=> (int) date('i',$start),
					'exec[end][str]'	=> date($this->common_prefs['dateformat'],$end),
					'exec[end][i]'		=> (int) date('i',$end),
					'exec[duration]'    => $content['duration'],
				);
				if ($this->common_prefs['timeformat'] == 12)
				{
					$fields_to_set += array(
						'exec[start][H]'	=> date('h',$start),
						'exec[start][a]'	=> date('a',$start),
						'exec[end][H]'		=> date('h',$end),
						'exec[end][a]'		=> date('a',$end),
					);
				}
				else
				{
					$fields_to_set += array(
						'exec[start][H]'	=> (int) date('H',$start),
						'exec[end][H]'		=> (int) date('H',$end),
					);
				}
				echo "<html>
<script>
	var fields = Array('".implode("','",array_keys($fields_to_set))."');
	var values = Array('".implode("','",$fields_to_set)."');
	for (i=0; i < fields.length; ++i) {
		elements = opener.document.getElementsByName(fields[i]);
		if (elements) {
			if (elements.length == 1)
				elements[0].value = values[i];
			else
				for (n=0; n < elements.length; ++n) {
					if (elements[n].value == values[i]) elements[n].checked = true;
				}
		}
	}
	window.close();
</script>
</html>\n";
				exit;
			}
		}
		if ($content['recur_type'])
		{
			$content['msg'] .= lang('Only the initial date of that recuring event is checked!');
		}
		$content['freetime'] = $this->freetime($content['participants'],$content['start'],$content['start']+$content['search_window'],$content['duration'],$content['cal_id']);
		$content['freetime'] = $this->split_freetime_daywise($content['freetime'],$content['duration'],$content['weekdays'],$content['start_time'],$content['end_time'],$sel_options);

		//echo "<pre>".print_r($content,true)."</pre>\n";
		$GLOBALS['egw_info']['flags']['app_header'] = lang('calendar') . ' - ' . lang('freetime search');
		// let the window popup, if its already there
		$GLOBALS['egw_info']['flags']['java_script'] .= "<script>\nwindow.focus();\n</script>\n";

		if (!is_object($GLOBALS['egw']->js))
		{
			$GLOBALS['egw']->js = CreateObject('phpgwapi.javascript');
		}
		$sel_options['duration'] = $this->durations;
		if ($content['duration'] && isset($sel_options['duration'][$content['duration']])) $content['end'] = '';
		// We hide the enddate if one of our predefined durations fits
		// the call to set_style_by_class has to be in onload, to make sure the function and the element is already created
		$GLOBALS['egw']->js->set_onload("set_style_by_class('table','end_hide','visibility','".($content['duration'] && isset($sel_options['duration'][$content['duration']]) ? 'hidden' : 'visible')."');");

		$etpl->exec('calendar.calendar_uiforms.freetimesearch',$content,$sel_options,'',array(
				'participants'	=> $content['participants'],
				'cal_id'		=> $content['cal_id'],
				'recur_type'	=> $content['recur_type'],
			),2);
	}

	/**
	 * calculate the freetime of given $participants in a certain time-span
	 *
	 * @param array $participants user-id's
	 * @param int $start start-time timestamp in user-time
	 * @param int $end end-time timestamp in user-time
	 * @param int $duration min. duration in sec, default 1
	 * @param int $cal_id own id for existing events, to exclude them from being busy-time, default 0
	 * @return array of free time-slots: array with start and end values
	 */
	function freetime($participants,$start,$end,$duration=1,$cal_id=0)
	{
		if ($this->debug > 2) $this->bo->debug_message('uiforms::freetime(participants=%1, start=%2, end=%3, duration=%4, cal_id=%5)',true,$participants,$start,$end,$duration,$cal_id);

		$busy = $this->bo->search(array(
			'start' => $start,
			'end'	=> $end,
			'users'	=> $participants,
			'ignore_acl' => true,	// otherwise we get only events readable by the user
		));
		$busy[] = array(	// add end-of-search-date as event, to cope with empty search and get freetime til that date
			'start'	=> $end,
			'end'	=> $end,
		);
		$ft_start = $start;
		$freetime = array();
		$n = 0;
		foreach($busy as $event)
		{
			if ((int)$cal_id && $event['id'] == (int)$cal_id) continue;	// ignore our own event

 			if ($event['non_blocking']) continue; // ignore non_blocking events

			if ($this->debug)
			{
				echo "<p>ft_start=".date('D d.m.Y H:i',$ft_start)."<br>\n";
				echo "event[title]=$event[title]<br>\n";
				echo "event[start]=".date('D d.m.Y H:i',$event['start'])."<br>\n";
				echo "event[end]=".date('D d.m.Y H:i',$event['end'])."<br>\n";
			}
			// $events ends before our actual position ==> ignore it
			if ($event['end'] < $ft_start)
			{
				//echo "==> event ends before ft_start ==> continue<br>\n";
				continue;
			}
			// $events starts before our actual position ==> set start to it's end and go to next event
			if ($event['start'] < $ft_start)
			{
				//echo "==> event starts before ft_start ==> set ft_start to it's end & continue<br>\n";
				$ft_start = $event['end'];
				continue;
			}
			$ft_end = $event['start'];

			// only show slots equal or bigger to min_length
			if ($ft_end - $ft_start >= $duration)
			{
				$freetime[++$n] = array(
					'start'	=> $ft_start,
					'end'	=> $ft_end,
				);
				if ($this->debug > 1) echo "<p>freetime: ".date('D d.m.Y H:i',$ft_start)." - ".date('D d.m.Y H:i',$ft_end)."</p>\n";
			}
			$ft_start = $event['end'];
		}
		if ($this->debug > 0) $this->bo->debug_message('uiforms::freetime(participants=%1, start=%2, end=%3, duration=%4, cal_id=%5) freetime=%6',true,$participants,$start,$end,$duration,$cal_id,$freetime);

		return $freetime;
	}

	/**
	 * split the freetime in daywise slot, taking into account weekdays, start- and stop-times
	 *
	 * If the duration is bigger then the difference of start- and end_time, the end_time is ignored
	 *
	 * @param array $freetime free time-slots: array with start and end values
	 * @param int $duration min. duration in sec
	 * @param int $weekdays allowed weekdays, bitfield of MCAL_M_...
	 * @param int $start_time minimum start-hour 0-23
	 * @param int $end_time maximum end-hour 0-23, or 0 for none
	 * @param array $sel_options on return options for start-time selectbox
	 * @return array of free time-slots: array with start and end values
	 */
	function split_freetime_daywise($freetime,$duration,$weekdays,$start_time,$end_time,&$sel_options)
	{
		if ($this->debug > 1) $this->bo->debug_message('uiforms::split_freetime_daywise(freetime=%1, duration=%2, start_time=%3, end_time=%4)',true,$freetime,$duration,$start_time,$end_time);

		$freetime_daywise = array();
		if (!is_array($sel_options)) $sel_options = array();
		$time_format = $this->common_prefs['timeformat'] == 12 ? 'h:i a' : 'H:i';

		$start_time = (int) $start_time;	// ignore leading zeros
		$end_time   = (int) $end_time;

		// ignore the end_time, if duration would never fit
		if (($end_time - $start_time)*HOUR_s < $duration)
		{
			$end_time = 0;
			if ($this->debug > 1) $this->bo->debug_message('uiforms::split_freetime_daywise(, duration=%2, start_time=%3,..) end_time set to 0, it never fits durationn otherwise',true,$duration,$start_time);
		}
		$n = 0;
		foreach($freetime as $ft)
		{
			$daybegin = $this->bo->date2array($ft['start']);
			$daybegin['hour'] = $daybegin['minute'] = $daybegin['second'] = 0;
			unset($daybegin['raw']);
			$daybegin = $this->bo->date2ts($daybegin);

			for($t = $daybegin; $t < $ft['end']; $t += DAY_s,$daybegin += DAY_s)
			{
				$dow = date('w',$daybegin+DAY_s/2);	// 0=Sun, .., 6=Sat
				$mcal_dow = pow(2,$dow);
				if (!($weekdays & $mcal_dow))
				{
					//echo "wrong day of week $dow<br>\n";
					continue;	// wrong day of week
				}
				$start = $t < $ft['start'] ? $ft['start'] : $t;

				if ($start-$daybegin < $start_time*HOUR_s)	// start earlier then start_time
				{
					$start = $daybegin + $start_time*HOUR_s;
				}
				// if end_time given use it, else the original slot's end
				$end = $end_time ? $daybegin + $end_time*HOUR_s : $ft['end'];
				if ($end > $ft['end']) $end = $ft['end'];

				// slot to small for duration
				if ($end - $start < $duration)
				{
					//echo "slot to small for duration=$duration<br>\n";
					continue;
				}
				$freetime_daywise[++$n] = array(
					'start'	=> $start,
					'end'	=> $end,
				);
				$times = array();
				for ($s = $start; $s+$duration <= $end && $s < $daybegin+DAY_s; $s += 60*$this->cal_prefs['interval'])
				{
					$e = $s + $duration;
					$end_date = $e-$daybegin > DAY_s ? lang(date('l',$e)).' '.date($this->common_prefs['dateformat'],$e).' ' : '';
					$times[$s] = date($time_format,$s).' - '.$end_date.date($time_format,$e);
				}
				$sel_options[$n.'[start]'] = $times;
			}
		}
		return $freetime_daywise;
	}

	/**
	 * Export events as vCalendar version 2.0 files (iCal)
	 *
	 * @param int|array $content=0 numeric cal_id or submitted content from etempalte::exec
	 * @param boolean $return_error=false should an error-msg be returned or a regular page with it generated (default)
	 * @return string error-msg if $return_error
	 */
	function export($content=0,$return_error=false)
	{
        $boical = new calendar_ical();
		#error_log(__METHOD__.print_r($content,true));
		if (is_numeric($cal_id = $content ? $content : $_REQUEST['cal_id']))
		{
			if (!($ical =& $boical->exportVCal(array($cal_id),'2.0','PUBLISH',false)))
			{
				$msg = lang('Permission denied');

				if ($return_error) return $msg;
			}
			else
			{
				html::content_header('event.ics','text/calendar',bytes($ical));
				echo $ical;
				common::egw_exit();
			}
		}
		if (is_array($content))
		{
			$events =& $this->bo->search(array(
				'start' => $content['start'],
				'end'   => $content['end'],
				'enum_recuring' => false,
				'daywise'       => false,
				'owner'         => $this->owner,
				'date_format'   => 'server',	// timestamp in server time for boical class
			));
			if (!$events)
			{
				$msg = lang('No events found');
			}
			else
			{
				$ical =& $boical->exportVCal($events,'2.0','PUBLISH',false);
				html::content_header($content['file'] ? $content['file'] : 'event.ics','text/calendar',bytes($ical));
				echo $ical;
				common::egw_exit();
			}
		}
		if (!is_array($content))
		{
			$view = $GLOBALS['egw']->session->appsession('view','calendar');

			$content = array(
				'start' => $this->bo->date2ts($_REQUEST['start'] ? $_REQUEST['start'] : $this->date),
				'end'   => $this->bo->date2ts($_REQUEST['end'] ? $_REQUEST['end'] : $this->date),
				'file'  => 'event.ics',
				'version' => '2.0',
			);
		}
		$content['msg'] = $msg;

		$GLOBALS['egw_info']['flags']['app_header'] = lang('calendar') . ' - ' . lang('iCal Export');
		$etpl = new etemplate('calendar.export');
		$etpl->exec('calendar.calendar_uiforms.export',$content);
	}

	/**
	 * Import events as vCalendar version 2.0 files (iCal)
	 *
	 * @param array $content=null submitted content from etempalte::exec
	 */
	function import($content=null)
	{
		if (is_array($content))
		{
			if (is_array($content['ical_file']) && is_uploaded_file($content['ical_file']['tmp_name']))
			{
				@set_time_limit(0);	// try switching execution time limit off
				$start = microtime(true);

				$calendar_ical = new calendar_ical;
				$calendar_ical->setSupportedFields('file', '');
				if (!$calendar_ical->importVCal($f=fopen($content['ical_file']['tmp_name'],'r')))
				{
					$msg = lang('Error: importing the iCal');
				}
				else
				{
					$msg = lang('iCal successful imported').' '.lang('(%1 events in %2 seconds)',
						$calendar_ical->events_imported,number_format(microtime(true)-$start,1));
				}
				if ($f) fclose($f);
			}
			else
			{
				$msg = lang('You need to select an iCal file first');
			}
		}
		$content = array(
			'msg' => $msg,
		);
		$GLOBALS['egw_info']['flags']['app_header'] = lang('calendar') . ' - ' . lang('iCal Import');
		$etpl = new etemplate('calendar.import');

		$etpl->exec('calendar.calendar_uiforms.import',$content);
	}

	/**
	 * Edit category ACL (admin only)
	 *
	 * @param array $content=null
	 */
	function cat_acl(array $content=null)
	{
		if (!$GLOBALS['egw_info']['user']['apps']['admin'])
		{
			throw new egw_exception_no_permission_admin();
		}
		if ($content)
		{
			list($button) = each($content['button']);
			unset($content['button']);
			if ($button != 'cancel')	// store changed acl
			{
				foreach($content['rows'] as $data)
				{
					if (!($cat_id = $data['cat_id'])) continue;
					foreach(array_merge((array)$data['add'],(array)$data['status'],array_keys((array)$data['old'])) as $account_id)
					{
						$rights = 0;
						if (in_array($account_id,(array)$data['add'])) $rights |= calendar_boupdate::CAT_ACL_ADD;
						if (in_array($account_id,(array)$data['status'])) $rights |= calendar_boupdate::CAT_ACL_STATUS;
						if ($account_id) $this->bo->set_cat_rights($cat_id,$account_id,$rights);
					}
				}
			}
			if ($button != 'apply')	// end dialog
			{
				egw::redirect_link('/index.php',array('menuaction' => $this->view_menuaction));
			}
		}
		$content['rows'] = $preserv['rows'] = array();
		$n = 1;
		foreach($this->bo->get_cat_rights() as $Lcat_id => $data)
		{
			$cat_id = (int)substr($Lcat_id,1);
			$row = array(
				'cat_id' => $cat_id,
				'add' => array(),
				'status' => array(),
			);
			foreach($data as $account_id => $rights)
			{
				if ($rights & calendar_boupdate::CAT_ACL_ADD) $row['add'][] = $account_id;
				if ($rights & calendar_boupdate::CAT_ACL_STATUS) $row['status'][] = $account_id;
			}
			$content['rows'][$n] = $row;
			$preserv['rows'][$n] = array(
				'cat_id' => $cat_id,
				'old' => $data,
			);
			$readonlys[$n.'[cat_id]'] = true;
			++$n;
		}
		// add empty row for new entries
		$content['rows'][] = array('cat_id' => '');

		$GLOBALS['egw_info']['flags']['app_header'] = lang('Calendar').' - '.lang('Category ACL');
		$tmp = new etemplate('calendar.cat_acl');
		$tmp->exec('calendar.calendar_uiforms.cat_acl',$content,null,$readonlys,$preserv);
	}

	/**
	* Set up the required fields to get the history tab
	*/
	public function setup_history(&$content, &$sel_options)
	{
		$status = 'history_status';

		$content['history'] = array(
			'id'    =>      $content['id'],
			'app'   =>      'calendar',
			'status-widgets' => array(
				'owner'        => 'select-account',
				'creator'      => 'select-account',
				'category'     => 'select-cat',
				'non_blocking' => array(''=>lang('No'), 1=>lang('Yes')),
				'public'       => array(''=>lang('No'), 1=>lang('Yes')),

				'start'		   => 'date-time',
				'end'		   => 'date-time',
				'tz_id'        => 'select-timezone',

				// Participants
				'participants'	=>	array(
					'select-account',
					$sel_options['status'],
					$sel_options['role']
				),
				'participants-c'	=>	array(
					'link:addressbook',
					$sel_options['status'],
					'label',
					$sel_options['role']
				),
				'participants-r'	=>	array(
					'link:resources',
					$sel_options['status'],
					'label',
					$sel_options['role']
				),
			),
		);


		// Get participants for only this one, if it's recurring.  The date is on the end of the value.
		if($content['recur_type'] || $content['recurrence'])
		{
			$content['history']['filter'] = array(
				'(history_status NOT LIKE \'participants%\' OR (history_status LIKE \'participants%\' AND (
					history_new_value LIKE \'%' . bo_tracking::ONE2N_SEPERATOR . $content['recurrence'] . '\' OR
					history_old_value LIKE \'%' . bo_tracking::ONE2N_SEPERATOR . $content['recurrence'] . '\')))'
			);
		}

		// Translate labels
		$tracking = new calendar_tracking();
		foreach($tracking->field2label as $field => $label)
		{
			$sel_options[$status][$field] = lang($label);
		}
		// custom fields are now "understood" directly by historylog widget
	}
}