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	diff --git a/plugins/calendar/TODO b/plugins/calendar/TODO
	index aefb61d3..35d5e0ae 100644
	--- a/plugins/calendar/TODO
	+++ b/plugins/calendar/TODO
	@@ -1,47 +1,47 @@
	+ Edit: 3.12: Subject
	+ Edit: 3.13: Location
	+ Edit: 3.14: Start / End / All Day
	+ Edit: 3.15: Show time as: Busy, Free, Out of office
	+ Edit: 3.16: Reminder set
	+ Edit: 3.17: Priority: High/Low
	+ Edit: 3.18: Recurrence (in line with Kontact)
	+ Edit: 3.19: Attachment Upload
	+ Edit: 3.20: Print
	+ Add/Manage Attendees
	+ Edit: 3.21: Required / Optional / Resource specification
	+ Edit: 3.22: Conflict Handling (Free/Busy Check for attendees)
	+ View: 3.3: Display modes (agenda / day / week / month)
	+ Day / Week / Month
	+ List (Agenda) view
	- Add selection for date range
	- Individual days selection
	+ Show list of calendars in a (hideable) drawer
	+ View: 3.1: Folder list
	+ View: 3.2: Add / Remove / Rename / Share Folders
	+ View: 3.6: Combined calendar view (Turn calendars on/off)
	+ View: 3.7: Small month overview calendar
	+ View: 3.5: Search
	- Filter by categories (similar to mail)
	+ View: 3.9: Alter event with drag/drop
	+ Option: 4.12: Set default reminder time
	+ Option: 3.23: Specify folder for new event (prefs)
	-- Option: Set date/time format in prefs
	++ Option: Set date/time format in prefs
	+ Receive: 1.20: Invitation handling
	- Jump to calendar view from mail ("Show event")
	- Allow to re-send invitations
	- Implement iTIP delegation

	-- View: 3.4: Fish-Eye View For Busy Days
	++ View: 3.4: Fish-Eye View For Busy Days
	+ View: 3.8: Color according to calendar and category (similar to Kontact)

	+ Support for multiple calendars (replace categories)
	+ Allow user to create/edit/delete calendars
	+ Colors for calendars should be user-configurable
	+ ICS parser/generator (http://code.google.com/p/qcal/)

	- Export with attachments
	-- Importing ICS files (upload, drag & drop)
	- Remember last visited view
	- Create/manage invdividual views
	-- Support for tasks/todos with task list view (ordered by date/time)
	++ Importing ICS files (upload, drag & drop)
	+

	diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
	index 75333a01..f7683cff 100644
	--- a/plugins/calendar/calendar_ui.js
	+++ b/plugins/calendar/calendar_ui.js
	@@ -1,2734 +1,2734 @@
	/**
	* Client UI Javascript for the Calendar plugin
	*
	* @version @package_version@
	* @author Lazlo Westerhof <hello@lazlo.me>
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
	* Copyright (C) 2012, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	// Roundcube calendar UI client class
	function rcube_calendar_ui(settings)
	{
	// extend base class
	rcube_calendar.call(this, settings);

	/* member vars */
	this.is_loading = false;
	this.selected_event = null;
	this.selected_calendar = null;
	this.search_request = null;
	this.saving_lock = null;


	/* private vars */
	var DAY_MS = 86400000;
	var HOUR_MS = 3600000;
	var me = this;
	var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone \|\| 0) - (settings.dst \|\| 0);
	var client_timezone = new Date().getTimezoneOffset();
	var day_clicked = day_clicked_ts = 0;
	var ignore_click = false;
	var event_defaults = { free_busy:'busy' };
	var event_attendees = [];
	var attendees_list;
	var freebusy_ui = { workinhoursonly:false, needsupdate:false };
	var freebusy_data = {};
	var current_view = null;
	var exec_deferred = bw.ie6 ? 5 : 1;
	var sensitivitylabels = { 0:rcmail.gettext('public','calendar'), 1:rcmail.gettext('private','calendar'), 2:rcmail.gettext('confidential','calendar') };
	var ui_loading = rcmail.set_busy(true, 'loading');

	// general datepicker settings
	var datepicker_settings = {
	// translate from fullcalendar format to datepicker format
	dateFormat: settings['date_format'].replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
	firstDay : settings['first_day'],
	dayNamesMin: settings['days_short'],
	monthNames: settings['months'],
	monthNamesShort: settings['months'],
	changeMonth: false,
	showOtherMonths: true,
	selectOtherMonths: true
	};


	/* private methods */

	var Q = this.quote_html;

	var text2html = function(str, maxlen, maxlines)
	{
	var html = Q(String(str));

	// limit visible text length
	if (maxlen) {
	var morelink = ' <a href="#more" onclick="$(this).hide().next().show();return false" class="morelink">'+rcmail.gettext('showmore','calendar')+'</a><span style="display:none">',
	lines = html.split(/\r?\n/),
	words, out = '', len = 0;

	for (var i=0; i < lines.length; i++) {
	len += lines[i].length;
	if (maxlines && i == maxlines - 1) {
	out += lines[i] + '\n' + morelink;
	maxlen = html.length * 2;
	}
	else if (len > maxlen) {
	len = out.length;
	words = lines[i].split(' ');
	for (var j=0; j < words.length; j++) {
	len += words[j].length + 1;
	out += words[j] + ' ';
	if (len > maxlen) {
	out += morelink;
	maxlen = html.length * 2;
	}
	}
	out += '\n';
	}
	else
	out += lines[i] + '\n';
	}

	if (maxlen > str.length)
	out += '</span>';

	html = out;
	}

	// simple link parser (similar to rcube_string_replacer class in PHP)
	var utf_domain = '[^?&@"\'/\$\$\\s\\r\\t\\n]+\\.([^\x00-\x2f\x3b-\x40\x5b-\x60\x7b-\x7f]{2,}\|xn--[a-z0-9]{2,})';
	var url1 = '.:;,', url2 = 'a-z0-9%=#@+?&/_~\\[\\]-';
	var link_pattern = new RegExp('([hf]t+ps?://)('+utf_domain+'(['+url1+']?['+url2+']+)*)?', 'ig');
	var mailto_pattern = new RegExp('([^\\s\\n\$\$;]+@'+utf_domain+')', 'ig');

	return html
	.replace(link_pattern, '<a href="$1$2" target="_blank">$1$2</a>')
	.replace(mailto_pattern, '<a href="mailto:$1">$1</a>')
	.replace(/(mailto:)([^"]+)"/g, '$1$2" onclick="rcmail.command(\'compose\', \'$2\');return false"')
	.replace(/\n/g, "<br/>");
	};

	// same as str.split(delimiter) but it ignores delimiters within quoted strings
	var explode_quoted_string = function(str, delimiter)
	{
	var result = [],
	strlen = str.length,
	q, p, i, char, last;

	for (q = p = i = 0; i < strlen; i++) {
	char = str.charAt(i);
	if (char == '"' && last != '\\') {
	q = !q;
	}
	else if (!q && char == delimiter) {
	result.push(str.substring(p, i));
	p = i + 1;
	}
	last = char;
	}

	result.push(str.substr(p));
	return result;
	};

	// from time and date strings to a real date object
	var parse_datetime = function(time, date)
	{
	// we use the utility function from datepicker to parse dates
	var date = date ? $.datepicker.parseDate(datepicker_settings.dateFormat, date, datepicker_settings) : new Date();

	var time_arr = time.replace(/\s[ap][.m]/i, '').replace(/0([0-9])/g, '$1').split(/[:.]/);
	if (!isNaN(time_arr[0])) {
	date.setHours(time_arr[0]);
	if (time.match(/p[.m]*/i) && date.getHours() < 12)
	date.setHours(parseInt(time_arr[0]) + 12);
	else if (time.match(/a[.m]*/i) && date.getHours() == 12)
	date.setHours(0);
	}
	if (!isNaN(time_arr[1]))
	date.setMinutes(time_arr[1]);

	return date;
	};

	// clone the given date object and optionally adjust time
	var clone_date = function(date, adjust)
	{
	var d = new Date(date.getTime());

	// set time to 00:00
	if (adjust == 1) {
	d.setHours(0);
	d.setMinutes(0);
	}
	// set time to 23:59
	else if (adjust == 2) {
	d.setHours(23);
	d.setMinutes(59);
	}

	return d;
	};

	// convert the given Date object into a unix timestamp respecting browser's and user's timezone settings
	var date2unixtime = function(date)
	{
	var dst_offset = (client_timezone - date.getTimezoneOffset()) * 60; // adjust DST offset
	return Math.round(date.getTime()/1000 + gmt_offset * 3600 + dst_offset);
	};

	var fromunixtime = function(ts)
	{
	ts -= gmt_offset * 3600;
	var date = new Date(ts * 1000),
	dst_offset = (client_timezone - date.getTimezoneOffset()) * 60;
	if (dst_offset) // adjust DST offset
	date.setTime((ts + 3600) * 1000);
	return date;
	};

	// determine whether the given date is on a weekend
	var is_weekend = function(date)
	{
	return date.getDay() == 0 \|\| date.getDay() == 6;
	};

	var is_workinghour = function(date)
	{
	if (settings['work_start'] > settings['work_end'])
	return date.getHours() >= settings['work_start'] \|\| date.getHours() < settings['work_end'];
	else
	return date.getHours() >= settings['work_start'] && date.getHours() < settings['work_end'];
	};

	// check if the event has 'real' attendees, excluding the current user
	var has_attendees = function(event)
	{
	return (event.attendees && (event.attendees.length > 1 \|\| event.attendees[0].email != settings.identity.email));
	};

	// check if the current user is an attendee of this event
	var is_attendee = function(event, role)
	{
	for (var i=0; event.attendees && i < event.attendees.length; i++) {
	if ((!role \|\| event.attendees[i].role == role) && event.attendees[i].email && settings.identity.emails.indexOf(';'+event.attendees[i].email) >= 0)
	return true;
	}
	return false;
	};

	// check if the current user is the organizer
	var is_organizer = function(event)
	{
	return is_attendee(event, 'ORGANIZER') \|\| !event.id;
	};

	// create a nice human-readable string for the date/time range
	var event_date_text = function(event)
	{
	var fromto, duration = event.end.getTime() / 1000 - event.start.getTime() / 1000;
	if (event.allDay)
	fromto = $.fullCalendar.formatDate(event.start, settings['date_format']) + (duration > 86400 \|\| event.start.getDay() != event.end.getDay() ? ' — ' + $.fullCalendar.formatDate(event.end, settings['date_format']) : '');
	else if (duration < 86400 && event.start.getDay() == event.end.getDay())
	fromto = $.fullCalendar.formatDate(event.start, settings['date_format']) + ' ' + $.fullCalendar.formatDate(event.start, settings['time_format']) + ' — '
	+ $.fullCalendar.formatDate(event.end, settings['time_format']);
	else
	fromto = $.fullCalendar.formatDate(event.start, settings['date_format']) + ' ' + $.fullCalendar.formatDate(event.start, settings['time_format']) + ' — '
	+ $.fullCalendar.formatDate(event.end, settings['date_format']) + ' ' + $.fullCalendar.formatDate(event.end, settings['time_format']);

	return fromto;
	};

	var load_attachment = function(event, att)
	{
	var qstring = '_id='+urlencode(att.id)+'&_event='+urlencode(event.recurrence_id\|\|event.id)+'&_cal='+urlencode(event.calendar);

	// open attachment in frame if it's of a supported mimetype
	if (id && att.mimetype && $.inArray(att.mimetype, rcmail.mimetypes)>=0) {
	rcmail.attachment_win = window.open(rcmail.env.comm_path+'&_action=get-attachment&'+qstring+'&_frame=1', 'rcubeeventattachment');
	if (rcmail.attachment_win) {
	window.setTimeout(function() { rcmail.attachment_win.focus(); }, 10);
	return;
	}
	}

	rcmail.goto_url('get-attachment', qstring+'&_download=1', false);
	};

	// build event attachments list
	var event_show_attachments = function(list, container, event, edit)
	{
	var i, id, len, img, content, li, elem,
	ul = document.createElement('UL');
	ul.className = 'attachmentslist';

	for (i=0, len=list.length; i<len; i++) {
	elem = list[i];
	li = document.createElement('LI');
	li.className = elem.classname;

	if (edit) {
	rcmail.env.attachments[elem.id] = elem;
	// delete icon
	content = document.createElement('A');
	content.href = '#delete';
	content.title = rcmail.gettext('delete');
	content.className = 'delete';
	$(content).click({id: elem.id}, function(e) { remove_attachment(this, e.data.id); return false; });

	if (!rcmail.env.deleteicon)
	content.innerHTML = rcmail.gettext('delete');
	else {
	img = document.createElement('IMG');
	img.src = rcmail.env.deleteicon;
	img.alt = rcmail.gettext('delete');
	content.appendChild(img);
	}

	li.appendChild(content);
	}

	// name/link
	content = document.createElement('A');
	content.innerHTML = elem.name;
	content.className = 'file';
	content.href = '#load';
	$(content).click({event: event, att: elem}, function(e) {
	load_attachment(e.data.event, e.data.att); return false; });
	li.appendChild(content);

	ul.appendChild(li);
	}

	if (edit && rcmail.gui_objects.attachmentlist) {
	ul.id = rcmail.gui_objects.attachmentlist.id;
	rcmail.gui_objects.attachmentlist = ul;
	}

	container.empty().append(ul);
	};

	var remove_attachment = function(elem, id)
	{
	$(elem.parentNode).hide();
	rcmail.env.deleted_attachments.push(id);
	delete rcmail.env.attachments[id];
	};

	// event details dialog (show only)
	var event_show_dialog = function(event)
	{
	var $dialog = $("#eventshow").dialog('close').removeClass().addClass('uidialog');
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:false };
	me.selected_event = event;

	$dialog.find('div.event-section, div.event-line').hide();
	$('#event-title').html(Q(event.title)).show();

	if (event.location)
	$('#event-location').html('@ ' + text2html(event.location)).show();
	if (event.description)
	$('#event-description').show().children('.event-text').html(text2html(event.description, 300, 6));

	// render from-to in a nice human-readable way
	// -> now shown in dialog title
	// $('#event-date').html(Q(me.event_date_text(event))).show();

	if (event.recurrence && event.recurrence_text)
	$('#event-repeat').show().children('.event-text').html(Q(event.recurrence_text));

	if (event.alarms && event.alarms_text)
	$('#event-alarm').show().children('.event-text').html(Q(event.alarms_text));

	if (calendar.name)
	$('#event-calendar').show().children('.event-text').html(Q(calendar.name)).removeClass().addClass('event-text').addClass('cal-'+calendar.id);
	if (event.categories)
	$('#event-category').show().children('.event-text').html(Q(event.categories)).removeClass().addClass('event-text cat-'+String(event.categories).replace(rcmail.identifier_expr, ''));
	if (event.free_busy)
	$('#event-free-busy').show().children('.event-text').html(Q(rcmail.gettext(event.free_busy, 'calendar')));
	if (event.priority > 0) {
	var priolabels = [ '', rcmail.gettext('highest'), rcmail.gettext('high'), '', '', rcmail.gettext('normal'), '', '', rcmail.gettext('low'), rcmail.gettext('lowest') ];
	$('#event-priority').show().children('.event-text').html(Q(event.priority+' '+priolabels[event.priority]));
	}

	if (event.sensitivity != 0) {
	var sensitivityclasses = { 0:'public', 1:'private', 2:'confidential' };
	$('#event-sensitivity').show().children('.event-text').html(Q(sensitivitylabels[event.sensitivity]));
	$dialog.addClass('sensitivity-'+sensitivityclasses[event.sensitivity]);
	}

	// create attachments list
	if ($.isArray(event.attachments)) {
	event_show_attachments(event.attachments, $('#event-attachments').children('.event-text'), event);
	if (event.attachments.length > 0) {
	$('#event-attachments').show();
	}
	}
	else if (calendar.attachments) {
	// fetch attachments, some drivers doesn't set 'attachments' prop of the event?
	}

	// list event attendees
	if (calendar.attendees && event.attendees) {
	var data, dispname, organizer = false, rsvp = false, html = '';
	for (var j=0; j < event.attendees.length; j++) {
	data = event.attendees[j];
	dispname = Q(data.name \|\| data.email);
	if (data.email) {
	dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink">' + dispname + '</a>';
	if (data.role == 'ORGANIZER')
	organizer = true;
	else if ((data.status == 'NEEDS-ACTION' \|\| data.status == 'TENTATIVE') && settings.identity.emails.indexOf(';'+data.email) >= 0)
	rsvp = data.status.toLowerCase();
	}
	html += '<span class="attendee ' + String(data.role == 'ORGANIZER' ? 'organizer' : data.status).toLowerCase() + '">' + dispname + '</span> ';

	// stop listing attendees
	if (j == 7 && event.attendees.length >= 7) {
	html += ' <em>' + rcmail.gettext('andnmore', 'calendar').replace('$nr', event.attendees.length - j - 1) + '</em>';
	break;
	}
	}

	if (html && (event.attendees.length > 1 \|\| !organizer)) {
	$('#event-attendees').show()
	.children('.event-text')
	.html(html)
	.find('a.mailtolink').click(function(e) { rcmail.redirect(rcmail.url('mail/compose', { _to:this.href.substr(7) })); return false; });
	}

	$('#event-rsvp')[(rsvp?'show':'hide')]();
	$('#event-rsvp .rsvp-buttons input').prop('disabled', false).filter('input[rel='+rsvp+']').prop('disabled', true);
	}

	var buttons = {};
	if (calendar.editable && event.editable !== false) {
	buttons[rcmail.gettext('edit', 'calendar')] = function() {
	event_edit_dialog('edit', event);
	};
	buttons[rcmail.gettext('remove', 'calendar')] = function() {
	me.delete_event(event);
	$dialog.dialog('close');
	};
	}
	else {
	buttons[rcmail.gettext('close', 'calendar')] = function(){
	$dialog.dialog('close');
	};
	}

	// open jquery UI dialog
	$dialog.dialog({
	modal: false,
	resizable: !bw.ie6,
	closeOnEscape: (!bw.ie6 && !bw.ie7), // disable for performance reasons
	title: Q(me.event_date_text(event)),
	close: function() {
	$dialog.dialog('destroy').hide();
	},
	buttons: buttons,
	minWidth: 320,
	width: 420
	}).show();

	// set dialog size according to content
	me.dialog_resize($dialog.get(0), $dialog.height(), 420);
	/*
	// add link for "more options" drop-down
	$('<a>')
	.attr('href', '#')
	.html('More Options')
	.addClass('dropdown-link')
	.click(function(){ return false; })
	.insertBefore($dialog.parent().find('.ui-dialog-buttonset').children().first());
	*/
	};

	// bring up the event dialog (jquery-ui popup)
	var event_edit_dialog = function(action, event)
	{
	// close show dialog first
	$("#eventshow").dialog('close');

	var $dialog = $('<div>');
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:action=='new' };
	me.selected_event = $.extend($.extend({}, event_defaults), event); // clone event object (with defaults)
	event = me.selected_event; // change reference to clone
	freebusy_ui.needsupdate = false;

	// reset dialog first
	$('#eventtabs').get(0).reset();

	// event details
	var title = $('#edit-title').val(event.title \|\| '');
	var location = $('#edit-location').val(event.location \|\| '');
	var description = $('#edit-description').html(event.description \|\| '');
	var categories = $('#edit-categories').val(event.categories);
	var calendars = $('#edit-calendar').val(event.calendar);
	var freebusy = $('#edit-free-busy').val(event.free_busy);
	var priority = $('#edit-priority').val(event.priority);
	var sensitivity = $('#edit-sensitivity').val(event.sensitivity);

	var duration = Math.round((event.end.getTime() - event.start.getTime()) / 1000);
	var startdate = $('#edit-startdate').val($.fullCalendar.formatDate(event.start, settings['date_format'])).data('duration', duration);
	var starttime = $('#edit-starttime').val($.fullCalendar.formatDate(event.start, settings['time_format'])).show();
	var enddate = $('#edit-enddate').val($.fullCalendar.formatDate(event.end, settings['date_format']));
	var endtime = $('#edit-endtime').val($.fullCalendar.formatDate(event.end, settings['time_format'])).show();
	var allday = $('#edit-allday').get(0);
	var notify = $('#edit-attendees-donotify').get(0);
	var invite = $('#edit-attendees-invite').get(0);
	notify.checked = has_attendees(event), invite.checked = true;

	if (event.allDay) {
	starttime.val("12:00").hide();
	endtime.val("13:00").hide();
	allday.checked = true;
	}
	else {
	allday.checked = false;
	}

	// set alarm(s)
	// TODO: support multiple alarm entries
	if (event.alarms) {
	if (typeof event.alarms == 'string')
	event.alarms = event.alarms.split(';');

	for (var alarm, i=0; i < event.alarms.length; i++) {
	alarm = String(event.alarms[i]).split(':');
	if (!alarm[1] && alarm[0]) alarm[1] = 'DISPLAY';
	$('select.edit-alarm-type').val(alarm[1]);

	if (alarm[0].match(/@(\d+)/)) {
	var ondate = fromunixtime(parseInt(RegExp.$1));
	$('select.edit-alarm-offset').val('@');
	$('input.edit-alarm-date').val($.fullCalendar.formatDate(ondate, settings['date_format']));
	$('input.edit-alarm-time').val($.fullCalendar.formatDate(ondate, settings['time_format']));
	}
	else if (alarm[0].match(/([-+])(\d+)([MHD])/)) {
	$('input.edit-alarm-value').val(RegExp.$2);
	$('select.edit-alarm-offset').val(''+RegExp.$1+RegExp.$3);
	}
	}
	}
	// set correct visibility by triggering onchange handlers
	$('select.edit-alarm-type, select.edit-alarm-offset').change();

	// enable/disable alarm property according to backend support
	$('#edit-alarms')[(calendar.alarms ? 'show' : 'hide')]();

	// check categories drop-down: add value if not exists
	if (event.categories && !categories.find("option[value='"+event.categories+"']").length) {
	$('<option>').attr('value', event.categories).text(event.categories).appendTo(categories).prop('selected', true);
	}

	// set recurrence form
	var recurrence, interval, rrtimes, rrenddate;
	var load_recurrence_tab = function()
	{
	recurrence = $('#edit-recurrence-frequency').val(event.recurrence ? event.recurrence.FREQ : '').change();
	interval = $('select.edit-recurrence-interval').val(event.recurrence ? event.recurrence.INTERVAL : 1);
	rrtimes = $('#edit-recurrence-repeat-times').val(event.recurrence ? event.recurrence.COUNT : 1);
	rrenddate = $('#edit-recurrence-enddate').val(event.recurrence && event.recurrence.UNTIL ? $.fullCalendar.formatDate(new Date(event.recurrence.UNTIL*1000), settings['date_format']) : '');
	$('input.edit-recurrence-until:checked').prop('checked', false);

	var weekdays = ['SU','MO','TU','WE','TH','FR','SA'];
	var rrepeat_id = '#edit-recurrence-repeat-forever';
	if (event.recurrence && event.recurrence.COUNT) rrepeat_id = '#edit-recurrence-repeat-count';
	else if (event.recurrence && event.recurrence.UNTIL) rrepeat_id = '#edit-recurrence-repeat-until';
	$(rrepeat_id).prop('checked', true);

	if (event.recurrence && event.recurrence.BYDAY && event.recurrence.FREQ == 'WEEKLY') {
	var wdays = event.recurrence.BYDAY.split(',');
	$('input.edit-recurrence-weekly-byday').val(wdays);
	}
	if (event.recurrence && event.recurrence.BYMONTHDAY) {
	$('input.edit-recurrence-monthly-bymonthday').val(String(event.recurrence.BYMONTHDAY).split(','));
	$('input.edit-recurrence-monthly-mode').val(['BYMONTHDAY']);
	}
	if (event.recurrence && event.recurrence.BYDAY && (event.recurrence.FREQ == 'MONTHLY' \|\| event.recurrence.FREQ == 'YEARLY')) {
	var byday, section = event.recurrence.FREQ.toLowerCase();
	if ((byday = String(event.recurrence.BYDAY).match(/(-?[1-4])([A-Z]+)/))) {
	$('#edit-recurrence-'+section+'-prefix').val(byday[1]);
	$('#edit-recurrence-'+section+'-byday').val(byday[2]);
	}
	$('input.edit-recurrence-'+section+'-mode').val(['BYDAY']);
	}
	else if (event.start) {
	$('#edit-recurrence-monthly-byday').val(weekdays[event.start.getDay()]);
	}
	if (event.recurrence && event.recurrence.BYMONTH) {
	$('input.edit-recurrence-yearly-bymonth').val(String(event.recurrence.BYMONTH).split(','));
	}
	else if (event.start) {
	$('input.edit-recurrence-yearly-bymonth').val([String(event.start.getMonth()+1)]);
	}
	};

	// show warning if editing a recurring event
	if (event.id && event.recurrence) {
	$('#edit-recurring-warning').show();
	$('input.edit-recurring-savemode[value="all"]').prop('checked', true);
	}
	else
	$('#edit-recurring-warning').hide();

	// init attendees tab
	var organizer = !event.attendees \|\| is_organizer(event);
	event_attendees = [];
	attendees_list = $('#edit-attendees-table > tbody').html('');
	$('#edit-attendees-notify')[(notify.checked && organizer ? 'show' : 'hide')]();
	$('#edit-localchanges-warning')[(has_attendees(event) && !organizer ? 'show' : 'hide')]();

	var load_attendees_tab = function()
	{
	if (event.attendees) {
	for (var j=0; j < event.attendees.length; j++)
	add_attendee(event.attendees[j], !organizer);
	}

	$('#edit-attendees-form')[(organizer?'show':'hide')]();
	$('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
	};

	// attachments
	var load_attachments_tab = function()
	{
	rcmail.enable_command('remove-attachment', !calendar.readonly);
	rcmail.env.deleted_attachments = [];
	// we're sharing some code for uploads handling with app.js
	rcmail.env.attachments = [];
	rcmail.env.compose_id = event.id; // for rcmail.async_upload_form()

	if ($.isArray(event.attachments)) {
	event_show_attachments(event.attachments, $('#edit-attachments'), event, true);
	}
	else {
	$('#edit-attachments > ul').empty();
	// fetch attachments, some drivers doesn't set 'attachments' array for event?
	}
	};


	// init dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('save', 'calendar')] = function() {
	var start = parse_datetime(allday.checked ? '12:00' : starttime.val(), startdate.val());
	var end = parse_datetime(allday.checked ? '13:00' : endtime.val(), enddate.val());

	// basic input validatetion
	if (start.getTime() > end.getTime()) {
	alert(rcmail.gettext('invalideventdates', 'calendar'));
	return false;
	}

	// post data to server
	var data = {
	calendar: event.calendar,
	start: date2unixtime(start),
	end: date2unixtime(end),
	allday: allday.checked?1:0,
	title: title.val(),
	description: description.val(),
	location: location.val(),
	categories: categories.val(),
	free_busy: freebusy.val(),
	priority: priority.val(),
	sensitivity: sensitivity.val(),
	recurrence: '',
	alarms: '',
	attendees: event_attendees,
	deleted_attachments: rcmail.env.deleted_attachments,
	attachments: []
	};

	// serialize alarm settings
	// TODO: support multiple alarm entries
	var alarm = $('select.edit-alarm-type').val();
	if (alarm) {
	var val, offset = $('select.edit-alarm-offset').val();
	if (offset == '@')
	data.alarms = '@' + date2unixtime(parse_datetime($('input.edit-alarm-time').val(), $('input.edit-alarm-date').val())) + ':' + alarm;
	else if ((val = parseInt($('input.edit-alarm-value').val())) && !isNaN(val) && val >= 0)
	data.alarms = offset[0] + val + offset[1] + ':' + alarm;
	}

	// uploaded attachments list
	for (var i in rcmail.env.attachments)
	if (i.match(/^rcmfile(.+)/))
	data.attachments.push(RegExp.$1);

	// read attendee roles
	$('select.edit-attendee-role').each(function(i, elem){
	if (data.attendees[i])
	data.attendees[i].role = $(elem).val();
	});

	// don't submit attendees if only myself is added as organizer
	if (data.attendees.length == 1 && data.attendees[0].role == 'ORGANIZER' && data.attendees[0].email == settings.identity.email)
	data.attendees = [];

	// tell server to send notifications
	if (data.attendees.length && organizer && ((event.id && notify.checked) \|\| (!event.id && invite.checked))) {
	data._notify = 1;
	}

	// gather recurrence settings
	var freq;
	if ((freq = recurrence.val()) != '') {
	data.recurrence = {
	FREQ: freq,
	INTERVAL: $('#edit-recurrence-interval-'+freq.toLowerCase()).val()
	};

	var until = $('input.edit-recurrence-until:checked').val();
	if (until == 'count')
	data.recurrence.COUNT = rrtimes.val();
	else if (until == 'until')
	data.recurrence.UNTIL = date2unixtime(parse_datetime(endtime.val(), rrenddate.val()));

	if (freq == 'WEEKLY') {
	var byday = [];
	$('input.edit-recurrence-weekly-byday:checked').each(function(){ byday.push(this.value); });
	if (byday.length)
	data.recurrence.BYDAY = byday.join(',');
	}
	else if (freq == 'MONTHLY') {
	var mode = $('input.edit-recurrence-monthly-mode:checked').val(), bymonday = [];
	if (mode == 'BYMONTHDAY') {
	$('input.edit-recurrence-monthly-bymonthday:checked').each(function(){ bymonday.push(this.value); });
	if (bymonday.length)
	data.recurrence.BYMONTHDAY = bymonday.join(',');
	}
	else
	data.recurrence.BYDAY = $('#edit-recurrence-monthly-prefix').val() + $('#edit-recurrence-monthly-byday').val();
	}
	else if (freq == 'YEARLY') {
	var byday, bymonth = [];
	$('input.edit-recurrence-yearly-bymonth:checked').each(function(){ bymonth.push(this.value); });
	if (bymonth.length)
	data.recurrence.BYMONTH = bymonth.join(',');
	if ((byday = $('#edit-recurrence-yearly-byday').val()))
	data.recurrence.BYDAY = $('#edit-recurrence-yearly-prefix').val() + byday;
	}
	}

	data.calendar = calendars.val();

	if (event.id) {
	data.id = event.id;
	if (event.recurrence)
	data._savemode = $('input.edit-recurring-savemode:checked').val();
	if (data.calendar && data.calendar != event.calendar)
	data._fromcalendar = event.calendar;
	}

	update_event(action, data);
	$dialog.dialog("close");
	};

	if (event.id) {
	buttons[rcmail.gettext('remove', 'calendar')] = function() {
	me.delete_event(event);
	$dialog.dialog('close');
	};
	}

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	// show/hide tabs according to calendar's feature support
	$('#edit-tab-attendees')[(calendar.attendees?'show':'hide')]();
	$('#edit-tab-attachments')[(calendar.attachments?'show':'hide')]();

	// activate the first tab
	$('#eventtabs').tabs('select', 0);

	// hack: set task to 'calendar' to make all dialog actions work correctly
	var comm_path_before = rcmail.env.comm_path;
	rcmail.env.comm_path = comm_path_before.replace(/_task=[a-z]+/, '_task=calendar');

	var editform = $("#eventedit");

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: (!bw.ie6 && !bw.ie7), // disable for performance reasons
	closeOnEscape: false,
	title: rcmail.gettext((action == 'edit' ? 'edit_event' : 'new_event'), 'calendar'),
	close: function() {
	editform.hide().appendTo(document.body);
	$dialog.dialog("destroy").remove();
	rcmail.ksearch_blur();
	rcmail.ksearch_destroy();
	freebusy_data = {};
	rcmail.env.comm_path = comm_path_before; // restore comm_path
	},
	buttons: buttons,
	minWidth: 500,
	width: 580
	}).append(editform.show()); // adding form content AFTERWARDS massively speeds up opening on IE6

	// set dialog size according to form content
	me.dialog_resize($dialog.get(0), editform.height() + (bw.ie ? 20 : 0), 530);

	title.select();

	// init other tabs asynchronously
	window.setTimeout(load_recurrence_tab, exec_deferred);
	if (calendar.attendees)
	window.setTimeout(load_attendees_tab, exec_deferred);
	if (calendar.attachments)
	window.setTimeout(load_attachments_tab, exec_deferred);
	};

	// open a dialog to display detailed free-busy information and to find free slots
	var event_freebusy_dialog = function()
	{
	var $dialog = $('#eventfreebusy').dialog('close');
	var event = me.selected_event;

	if (!event_attendees.length)
	return false;

	// set form elements
	var allday = $('#edit-allday').get(0);
	var duration = Math.round((event.end.getTime() - event.start.getTime()) / 1000);
	freebusy_ui.startdate = $('#schedule-startdate').val($.fullCalendar.formatDate(event.start, settings['date_format'])).data('duration', duration);
	freebusy_ui.starttime = $('#schedule-starttime').val($.fullCalendar.formatDate(event.start, settings['time_format'])).show();
	freebusy_ui.enddate = $('#schedule-enddate').val($.fullCalendar.formatDate(event.end, settings['date_format']));
	freebusy_ui.endtime = $('#schedule-endtime').val($.fullCalendar.formatDate(event.end, settings['time_format'])).show();

	if (allday.checked) {
	freebusy_ui.starttime.val("12:00").hide();
	freebusy_ui.endtime.val("13:00").hide();
	event.allDay = true;
	}

	// read attendee roles from drop-downs
	$('select.edit-attendee-role').each(function(i, elem){
	if (event_attendees[i])
	event_attendees[i].role = $(elem).val();
	});

	// render time slots
	var now = new Date(), fb_start = new Date(), fb_end = new Date();
	fb_start.setTime(event.start);
	fb_start.setHours(0); fb_start.setMinutes(0); fb_start.setSeconds(0); fb_start.setMilliseconds(0);
	fb_end.setTime(fb_start.getTime() + DAY_MS);

	freebusy_data = { required:{}, all:{} };
	freebusy_ui.loading = 1; // prevent render_freebusy_grid() to load data yet
	freebusy_ui.numdays = Math.max(allday.checked ? 14 : 1, Math.ceil(duration * 2 / 86400));
	freebusy_ui.interval = allday.checked ? 1440 : 60;
	freebusy_ui.start = fb_start;
	freebusy_ui.end = new Date(freebusy_ui.start.getTime() + DAY_MS * freebusy_ui.numdays);
	render_freebusy_grid(0);

	// render list of attendees
	freebusy_ui.attendees = {};
	var domid, dispname, data, role_html, list_html = '';
	for (var i=0; i < event_attendees.length; i++) {
	data = event_attendees[i];
	dispname = Q(data.name \|\| data.email);
	domid = String(data.email).replace(rcmail.identifier_expr, '');
	role_html = '<a class="attendee-role-toggle" id="rcmlia' + domid + '" title="' + Q(rcmail.gettext('togglerole', 'calendar')) + '"> </a>';
	list_html += '<div class="attendee ' + String(data.role).toLowerCase() + '" id="rcmli' + domid + '">' + role_html + dispname + '</div>';

	// clone attendees data for local modifications
	freebusy_ui.attendees[i] = freebusy_ui.attendees[domid] = $.extend({}, data);
	}

	// add total row
	list_html += '<div class="attendee spacer"> </div>';
	list_html += '<div class="attendee total">' + rcmail.gettext('reqallattendees','calendar') + '</div>';

	$('#schedule-attendees-list').html(list_html)
	.unbind('click.roleicons')
	.bind('click.roleicons', function(e){
	// toggle attendee status upon click on icon
	if (e.target.id && e.target.id.match(/rcmlia(.+)/)) {
	var attendee, domid = RegExp.$1, roles = [ 'REQ-PARTICIPANT', 'OPT-PARTICIPANT', 'CHAIR' ];
	if ((attendee = freebusy_ui.attendees[domid]) && attendee.role != 'ORGANIZER') {
	var req = attendee.role != 'OPT-PARTICIPANT';
	var j = $.inArray(attendee.role, roles);
	j = (j+1) % roles.length;
	attendee.role = roles[j];
	$(e.target).parent().removeClass().addClass('attendee '+String(attendee.role).toLowerCase());

	// update total display if required-status changed
	if (req != (roles[j] != 'OPT-PARTICIPANT')) {
	compute_freebusy_totals();
	update_freebusy_display(attendee.email);
	}
	}
	}

	return false;
	});

	// enable/disable buttons
	$('#shedule-find-prev').button('option', 'disabled', (fb_start.getTime() < now.getTime()));

	// dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('select', 'calendar')] = function() {
	$('#edit-startdate').val(freebusy_ui.startdate.val());
	$('#edit-starttime').val(freebusy_ui.starttime.val());
	$('#edit-enddate').val(freebusy_ui.enddate.val());
	$('#edit-endtime').val(freebusy_ui.endtime.val());

	// write role changes back to main dialog
	$('select.edit-attendee-role').each(function(i, elem){
	if (event_attendees[i] && freebusy_ui.attendees[i]) {
	event_attendees[i].role = freebusy_ui.attendees[i].role;
	$(elem).val(event_attendees[i].role);
	}
	});

	if (freebusy_ui.needsupdate)
	update_freebusy_status(me.selected_event);
	freebusy_ui.needsupdate = false;
	$dialog.dialog("close");
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	$dialog.dialog({
	modal: true,
	resizable: true,
	closeOnEscape: (!bw.ie6 && !bw.ie7),
	title: rcmail.gettext('scheduletime', 'calendar'),
	close: function() {
	if (bw.ie6)
	$("#edit-attendees-table").css('visibility','visible');
	$dialog.dialog("destroy").hide();
	},
	resizeStop: function() {
	render_freebusy_overlay();
	},
	buttons: buttons,
	minWidth: 640,
	width: 850
	}).show();

	// hide edit dialog on IE6 because of drop-down elements
	if (bw.ie6)
	$("#edit-attendees-table").css('visibility','hidden');

	// adjust dialog size to fit grid without scrolling
	var gridw = $('#schedule-freebusy-times').width();
	var overflow = gridw - $('#attendees-freebusy-table td.times').width() + 1;
	me.dialog_resize($dialog.get(0), $dialog.height() + (bw.ie ? 20 : 0), 800 + Math.max(0, overflow));

	// fetch data from server
	freebusy_ui.loading = 0;
	load_freebusy_data(freebusy_ui.start, freebusy_ui.interval);
	};

	// render an HTML table showing free-busy status for all the event attendees
	var render_freebusy_grid = function(delta)
	{
	if (delta) {
	freebusy_ui.start.setTime(freebusy_ui.start.getTime() + DAY_MS * delta);
	// skip weekends if in workinhoursonly-mode
	if (Math.abs(delta) == 1 && freebusy_ui.workinhoursonly) {
	while (is_weekend(freebusy_ui.start))
	freebusy_ui.start.setTime(freebusy_ui.start.getTime() + DAY_MS * delta);
	}

	freebusy_ui.end = new Date(freebusy_ui.start.getTime() + DAY_MS * freebusy_ui.numdays);
	}

	var dayslots = Math.floor(1440 / freebusy_ui.interval);
	var date_format = 'ddd '+ (dayslots <= 2 ? settings.date_short : settings.date_format);
	var lastdate, datestr, css,
	curdate = new Date(),
	allday = (freebusy_ui.interval == 1440),
	times_css = (allday ? 'allday ' : ''),
	dates_row = '<tr class="dates">',
	times_row = '<tr class="times">',
	slots_row = '';
	for (var s = 0, t = freebusy_ui.start.getTime(); t < freebusy_ui.end.getTime(); s++) {
	curdate.setTime(t);
	datestr = fc.fullCalendar('formatDate', curdate, date_format);
	if (datestr != lastdate) {
	dates_row += '<th colspan="' + dayslots + '" class="boxtitle date' + $.fullCalendar.formatDate(curdate, 'ddMMyyyy') + '">' + Q(datestr) + '</th>';
	lastdate = datestr;
	}

	// set css class according to working hours
	css = is_weekend(curdate) \|\| (freebusy_ui.interval <= 60 && !is_workinghour(curdate)) ? 'offhours' : 'workinghours';
	times_row += '<td class="' + times_css + css + '" id="t-' + Math.floor(t/1000) + '">' + Q(allday ? rcmail.gettext('all-day','calendar') : $.fullCalendar.formatDate(curdate, settings['time_format'])) + '</td>';
	slots_row += '<td class="' + css + ' unknown"> </td>';

	t += freebusy_ui.interval * 60000;
	}
	dates_row += '</tr>';
	times_row += '</tr>';

	// render list of attendees
	var domid, data, list_html = '', times_html = '';
	for (var i=0; i < event_attendees.length; i++) {
	data = event_attendees[i];
	domid = String(data.email).replace(rcmail.identifier_expr, '');
	times_html += '<tr id="fbrow' + domid + '">' + slots_row + '</tr>';
	}

	// add line for all/required attendees
	times_html += '<tr class="spacer"><td colspan="' + (dayslots * freebusy_ui.numdays) + '"> </td>';
	times_html += '<tr id="fbrowall">' + slots_row + '</tr>';

	var table = $('#schedule-freebusy-times');
	table.children('thead').html(dates_row + times_row);
	table.children('tbody').html(times_html);

	// initialize event handlers on grid
	if (!freebusy_ui.grid_events) {
	freebusy_ui.grid_events = true;
	table.children('thead').click(function(e){
	// move event to the clicked date/time
	if (e.target.id && e.target.id.match(/t-(\d+)/)) {
	var newstart = new Date(RegExp.$1 * 1000);
	// set time to 00:00
	if (me.selected_event.allDay) {
	newstart.setMinutes(0);
	newstart.setHours(0);
	}
	update_freebusy_dates(newstart, new Date(newstart.getTime() + freebusy_ui.startdate.data('duration') * 1000));
	render_freebusy_overlay();
	}
	})
	}

	// if we have loaded free-busy data, show it
	if (!freebusy_ui.loading) {
	if (date2unixtime(freebusy_ui.start) < freebusy_data.start \|\| date2unixtime(freebusy_ui.end) > freebusy_data.end \|\| freebusy_ui.interval != freebusy_data.interval) {
	load_freebusy_data(freebusy_ui.start, freebusy_ui.interval);
	}
	else {
	for (var email, i=0; i < event_attendees.length; i++) {
	if ((email = event_attendees[i].email))
	update_freebusy_display(email);
	}
	}
	}

	// render current event date/time selection over grid table
	// use timeout to let the dom attributes (width/height/offset) be set first
	window.setTimeout(function(){ render_freebusy_overlay(); }, 10);
	};

	// render overlay element over the grid to visiualize the current event date/time
	var render_freebusy_overlay = function()
	{
	var overlay = $('#schedule-event-time');
	if (me.selected_event.end.getTime() <= freebusy_ui.start.getTime() \|\| me.selected_event.start.getTime() >= freebusy_ui.end.getTime()) {
	overlay.draggable('disable').hide();
	}
	else {
	var table = $('#schedule-freebusy-times'),
	width = 0,
	pos = { top:table.children('thead').height(), left:0 },
	eventstart = date2unixtime(clone_date(me.selected_event.start, me.selected_event.allDay?1:0)),
	eventend = date2unixtime(clone_date(me.selected_event.end, me.selected_event.allDay?2:0)) - 60,
	slotstart = date2unixtime(freebusy_ui.start),
	slotsize = freebusy_ui.interval * 60,
	slotend, fraction, $cell;

	// iterate through slots to determine position and size of the overlay
	table.children('thead').find('td').each(function(i, cell){
	slotend = slotstart + slotsize - 1;
	// event starts in this slot: compute left
	if (eventstart >= slotstart && eventstart <= slotend) {
	fraction = 1 - (slotend - eventstart) / slotsize;
	pos.left = Math.round(cell.offsetLeft + cell.offsetWidth * fraction);
	}
	// event ends in this slot: compute width
	if (eventend >= slotstart && eventend <= slotend) {
	fraction = 1 - (slotend - eventend) / slotsize;
	width = Math.round(cell.offsetLeft + cell.offsetWidth * fraction) - pos.left;
	}

	slotstart = slotstart + slotsize;
	});

	if (!width)
	width = table.width() - pos.left;

	// overlay is visible
	if (width > 0) {
	overlay.css({ width: (width-5)+'px', height:(table.children('tbody').height() - 4)+'px', left:pos.left+'px', top:pos.top+'px' }).draggable('enable').show();

	// configure draggable
	if (!overlay.data('isdraggable')) {
	overlay.draggable({
	axis: 'x',
	scroll: true,
	stop: function(e, ui){
	// convert pixels to time
	var px = ui.position.left;
	var range_p = $('#schedule-freebusy-times').width();
	var range_t = freebusy_ui.end.getTime() - freebusy_ui.start.getTime();
	var newstart = new Date(freebusy_ui.start.getTime() + px * (range_t / range_p));
	newstart.setSeconds(0); newstart.setMilliseconds(0);
	// snap to day boundaries
	if (me.selected_event.allDay) {
	if (newstart.getHours() >= 12) // snap to next day
	newstart.setTime(newstart.getTime() + DAY_MS);
	newstart.setMinutes(0);
	newstart.setHours(0);
	}
	else {
	// round to 5 minutes
	var round = newstart.getMinutes() % 5;
	if (round > 2.5) newstart.setTime(newstart.getTime() + (5 - round) * 60000);
	else if (round > 0) newstart.setTime(newstart.getTime() - round * 60000);
	}
	// update event times and display
	update_freebusy_dates(newstart, new Date(newstart.getTime() + freebusy_ui.startdate.data('duration') * 1000));
	if (me.selected_event.allDay)
	render_freebusy_overlay();
	}
	}).data('isdraggable', true);
	}
	}
	else
	overlay.draggable('disable').hide();
	}

	};


	// fetch free-busy information for each attendee from server
	var load_freebusy_data = function(from, interval)
	{
	var start = new Date(from.getTime() - DAY_MS * 2); // start 1 days before event
	var end = new Date(start.getTime() + DAY_MS * Math.max(14, freebusy_ui.numdays + 7)); // load min. 14 days
	freebusy_ui.numrequired = 0;
	freebusy_data.all = [];
	freebusy_data.required = [];

	// load free-busy information for every attendee
	var domid, email;
	for (var i=0; i < event_attendees.length; i++) {
	if ((email = event_attendees[i].email)) {
	domid = String(email).replace(rcmail.identifier_expr, '');
	$('#rcmli' + domid).addClass('loading');
	freebusy_ui.loading++;

	$.ajax({
	type: 'GET',
	dataType: 'json',
	url: rcmail.url('freebusy-times'),
	data: { email:email, start:date2unixtime(clone_date(start, 1)), end:date2unixtime(clone_date(end, 2)), interval:interval, _remote:1 },
	success: function(data) {
	freebusy_ui.loading--;

	// find attendee
	var attendee = null;
	for (var i=0; i < event_attendees.length; i++) {
	if (freebusy_ui.attendees[i].email == data.email) {
	attendee = freebusy_ui.attendees[i];
	break;
	}
	}

	// copy data to member var
	var req = attendee.role != 'OPT-PARTICIPANT';
	var ts = data.start - 0;
	freebusy_data.start = ts;
	freebusy_data[data.email] = {};
	for (var i=0; i < data.slots.length; i++) {
	freebusy_data[data.email][ts] = data.slots[i];

	// set totals
	if (!freebusy_data.required[ts])
	freebusy_data.required[ts] = [0,0,0,0];
	if (req)
	freebusy_data.required[ts][data.slots[i]]++;

	if (!freebusy_data.all[ts])
	freebusy_data.all[ts] = [0,0,0,0];
	freebusy_data.all[ts][data.slots[i]]++;

	ts += data.interval * 60;
	}
	freebusy_data.end = ts;
	freebusy_data.interval = data.interval;

	// hide loading indicator
	var domid = String(data.email).replace(rcmail.identifier_expr, '');
	$('#rcmli' + domid).removeClass('loading');

	// update display
	update_freebusy_display(data.email);
	}
	});

	// count required attendees
	if (freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT')
	freebusy_ui.numrequired++;
	}
	}
	};

	// re-calculate total status after role change
	var compute_freebusy_totals = function()
	{
	freebusy_ui.numrequired = 0;
	freebusy_data.all = [];
	freebusy_data.required = [];

	var email, req, status;
	for (var i=0; i < event_attendees.length; i++) {
	if (!(email = event_attendees[i].email))
	continue;

	req = freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT';
	if (req)
	freebusy_ui.numrequired++;

	for (var ts in freebusy_data[email]) {
	if (!freebusy_data.required[ts])
	freebusy_data.required[ts] = [0,0,0,0];
	if (!freebusy_data.all[ts])
	freebusy_data.all[ts] = [0,0,0,0];

	status = freebusy_data[email][ts];
	freebusy_data.all[ts][status]++;

	if (req)
	freebusy_data.required[ts][status]++;
	}
	}
	};

	// update free-busy grid with status loaded from server
	var update_freebusy_display = function(email)
	{
	var status_classes = ['unknown','free','busy','tentative','out-of-office'];
	var domid = String(email).replace(rcmail.identifier_expr, '');
	var row = $('#fbrow' + domid);
	var rowall = $('#fbrowall').children();
	var ts = date2unixtime(freebusy_ui.start);
	var fbdata = freebusy_data[email];

	if (fbdata && fbdata[ts] !== undefined && row.length) {
	row.children().each(function(i, cell){
	cell.className = cell.className.replace('unknown', fbdata[ts] ? status_classes[fbdata[ts]] : 'unknown');

	// also update total row if all data was loaded
	if (freebusy_ui.loading == 0 && freebusy_data.all[ts] && (cell = rowall.get(i))) {
	var workinghours = cell.className.indexOf('workinghours') >= 0;
	var all_status = freebusy_data.all[ts][2] ? 'busy' : 'unknown';
	req_status = freebusy_data.required[ts][2] ? 'busy' : 'free';
	for (var j=1; j < status_classes.length; j++) {
	if (freebusy_ui.numrequired && freebusy_data.required[ts][j] >= freebusy_ui.numrequired)
	req_status = status_classes[j];
	if (freebusy_data.all[ts][j] == event_attendees.length)
	all_status = status_classes[j];
	}

	cell.className = (workinghours ? 'workinghours ' : 'offhours ') + req_status + ' all-' + all_status;
	}

	ts += freebusy_ui.interval * 60;
	});
	}
	};

	// write changed event date/times back to form fields
	var update_freebusy_dates = function(start, end)
	{
	if (me.selected_event.allDay) {
	start.setHours(12);
	start.setMinutes(0);
	end.setHours(13);
	end.setMinutes(0);
	}
	me.selected_event.start = start;
	me.selected_event.end = end;
	freebusy_ui.startdate.val($.fullCalendar.formatDate(start, settings['date_format']));
	freebusy_ui.starttime.val($.fullCalendar.formatDate(start, settings['time_format']));
	freebusy_ui.enddate.val($.fullCalendar.formatDate(end, settings['date_format']));
	freebusy_ui.endtime.val($.fullCalendar.formatDate(end, settings['time_format']));
	freebusy_ui.needsupdate = true;
	};

	// attempt to find a time slot where all attemdees are available
	var freebusy_find_slot = function(dir)
	{
	var event = me.selected_event,
	eventstart = date2unixtime(event.start), // calculate with unixtimes
	eventend = date2unixtime(event.end),
	duration = eventend - eventstart,
	sinterval = freebusy_data.interval * 60,
	intvlslots = 1,
	numslots = Math.ceil(duration / sinterval),
	checkdate, slotend, email, curdate;

	// shift event times to next possible slot
	eventstart += sinterval * intvlslots * dir;
	eventend += sinterval * intvlslots * dir;

	// iterate through free-busy slots and find candidates
	var candidatecount = 0, candidatestart = candidateend = success = false;
	for (var slot = dir > 0 ? freebusy_data.start : freebusy_data.end - sinterval; (dir > 0 && slot < freebusy_data.end) \|\| (dir < 0 && slot >= freebusy_data.start); slot += sinterval * dir) {
	slotend = slot + sinterval;
	if ((dir > 0 && slotend <= eventstart) \|\| (dir < 0 && slot >= eventend)) // skip
	continue;

	// respect workingours setting
	if (freebusy_ui.workinhoursonly) {
	curdate = fromunixtime(dir > 0 \|\| !candidateend ? slot : (candidateend - duration));
	if (is_weekend(curdate) \|\| (freebusy_data.interval <= 60 && !is_workinghour(curdate))) { // skip off-hours
	candidatestart = candidateend = false;
	candidatecount = 0;
	continue;
	}
	}

	if (!candidatestart)
	candidatestart = slot;

	// check freebusy data for all attendees
	for (var i=0; i < event_attendees.length; i++) {
	if (freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT' && (email = freebusy_ui.attendees[i].email) && freebusy_data[email] && freebusy_data[email][slot] > 1) {
	candidatestart = candidateend = false;
	break;
	}
	}

	// occupied slot
	if (!candidatestart) {
	slot += Math.max(0, intvlslots - candidatecount - 1) * sinterval * dir;
	candidatecount = 0;
	continue;
	}

	// set candidate end to slot end time
	candidatecount++;
	if (dir < 0 && !candidateend)
	candidateend = slotend;

	// if candidate is big enough, this is it!
	if (candidatecount == numslots) {
	if (dir > 0) {
	event.start = fromunixtime(candidatestart);
	event.end = fromunixtime(candidatestart + duration);
	}
	else {
	event.end = fromunixtime(candidateend);
	event.start = fromunixtime(candidateend - duration);
	}
	success = true;
	break;
	}
	}

	// update event date/time display
	if (success) {
	update_freebusy_dates(event.start, event.end);

	// move freebusy grid if necessary
	var offset = Math.ceil((event.start.getTime() - freebusy_ui.end.getTime()) / DAY_MS);
	if (event.start.getTime() >= freebusy_ui.end.getTime())
	render_freebusy_grid(Math.max(1, offset));
	else if (event.end.getTime() <= freebusy_ui.start.getTime())
	render_freebusy_grid(Math.min(-1, offset));
	else
	render_freebusy_overlay();

	var now = new Date();
	$('#shedule-find-prev').button('option', 'disabled', (event.start.getTime() < now.getTime()));
	}
	else {
	alert(rcmail.gettext('noslotfound','calendar'));
	}
	};


	// update event properties and attendees availability if event times have changed
	var event_times_changed = function()
	{
	if (me.selected_event) {
	var allday = $('#edit-allday').get(0);
	me.selected_event.allDay = allday.checked;
	me.selected_event.start = parse_datetime(allday.checked ? '12:00' : $('#edit-starttime').val(), $('#edit-startdate').val());
	me.selected_event.end = parse_datetime(allday.checked ? '13:00' : $('#edit-endtime').val(), $('#edit-enddate').val());
	if (event_attendees)
	freebusy_ui.needsupdate = true;
	$('#edit-startdate').data('duration', Math.round((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / 1000));
	}
	};

	// add the given list of participants
	var add_attendees = function(names)
	{
	names = explode_quoted_string(names.replace(/,\s*$/, ''), ',');

	// parse name/email pairs
	var item, email, name, success = false;
	for (var i=0; i < names.length; i++) {
	email = name = '';
	item = $.trim(names[i]);

	if (!item.length) {
	continue;
	} // address in brackets without name (do nothing)
	else if (item.match(/^<[^@]+@[^>]+>$/)) {
	email = item.replace(/[<>]/g, '');
	} // address without brackets and without name (add brackets)
	else if (rcube_check_email(item)) {
	email = item;
	} // address with name
	else if (item.match(/([^\s<@]+@[^>]+)>*$/)) {
	email = RegExp.$1;
	name = item.replace(email, '').replace(/^["\s<>]+/, '').replace(/["\s<>]+$/, '');
	}

	if (email) {
	add_attendee({ email:email, name:name, role:'REQ-PARTICIPANT', status:'NEEDS-ACTION' });
	success = true;
	}
	else {
	alert(rcmail.gettext('noemailwarning'));
	}
	}

	return success;
	};

	// add the given attendee to the list
	var add_attendee = function(data, readonly)
	{
	// check for dupes...
	var exists = false;
	$.each(event_attendees, function(i, v){ exists \|= (v.email == data.email); });
	if (exists)
	return false;

	var dispname = Q(data.name \|\| data.email);
	if (data.email)
	dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink">' + dispname + '</a>';

	// role selection
	var organizer = data.role == 'ORGANIZER';
	var opts = {};
	if (organizer)
	opts.ORGANIZER = rcmail.gettext('calendar.roleorganizer');
	opts['REQ-PARTICIPANT'] = rcmail.gettext('calendar.rolerequired');
	opts['OPT-PARTICIPANT'] = rcmail.gettext('calendar.roleoptional');
	opts['CHAIR'] = rcmail.gettext('calendar.roleresource');

	var select = '<select class="edit-attendee-role"' + (organizer \|\| readonly ? ' disabled="true"' : '') + '>';
	for (var r in opts)
	select += '<option value="'+ r +'" class="' + r.toLowerCase() + '"' + (data.role == r ? ' selected="selected"' : '') +'>' + Q(opts[r]) + '</option>';
	select += '</select>';

	// availability
	var avail = data.email ? 'loading' : 'unknown';

	// delete icon
	var icon = rcmail.env.deleteicon ? '<img src="' + rcmail.env.deleteicon + '" alt="" />' : rcmail.gettext('delete');
	var dellink = '<a href="#delete" class="deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';

	var html = '<td class="role">' + select + '</td>' +
	'<td class="name">' + dispname + '</td>' +
	'<td class="availability"><img src="./program/blank.gif" class="availabilityicon ' + avail + '" /></td>' +
	'<td class="confirmstate"><span class="' + String(data.status).toLowerCase() + '">' + Q(data.status) + '</span></td>' +
	'<td class="options">' + (organizer \|\| readonly ? '' : dellink) + '</td>';

	var tr = $('<tr>')
	.addClass(String(data.role).toLowerCase())
	.html(html)
	.appendTo(attendees_list);

	tr.find('a.deletelink').click({ id:(data.email \|\| data.name) }, function(e) { remove_attendee(this, e.data.id); return false; });
	tr.find('a.mailtolink').click(function(e) { rcmail.redirect(rcmail.url('mail/compose', { _to:this.href.substr(7) })); return false; });

	// check free-busy status
	if (avail == 'loading') {
	check_freebusy_status(tr.find('img.availabilityicon'), data.email, me.selected_event);
	}

	event_attendees.push(data);
	};

	// iterate over all attendees and update their free-busy status display
	var update_freebusy_status = function(event)
	{
	var icons = attendees_list.find('img.availabilityicon');
	for (var i=0; i < event_attendees.length; i++) {
	if (icons.get(i) && event_attendees[i].email)
	check_freebusy_status(icons.get(i), event_attendees[i].email, event);
	}

	freebusy_ui.needsupdate = false;
	};

	// load free-busy status from server and update icon accordingly
	var check_freebusy_status = function(icon, email, event)
	{
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { freebusy:false };
	if (!calendar.freebusy) {
	$(icon).removeClass().addClass('availabilityicon unknown');
	return;
	}

	icon = $(icon).removeClass().addClass('availabilityicon loading');

	$.ajax({
	type: 'GET',
	dataType: 'html',
	url: rcmail.url('freebusy-status'),
	data: { email:email, start:date2unixtime(clone_date(event.start, event.allDay?1:0)), end:date2unixtime(clone_date(event.end, event.allDay?2:0)), _remote: 1 },
	success: function(status){
	icon.removeClass('loading').addClass(String(status).toLowerCase());
	},
	error: function(){
	icon.removeClass('loading').addClass('unknown');
	}
	});
	};

	// remove an attendee from the list
	var remove_attendee = function(elem, id)
	{
	$(elem).closest('tr').remove();
	event_attendees = $.grep(event_attendees, function(data){ return (data.name != id && data.email != id) });
	};

	// when the user accepts or declines an event invitation
	var event_rsvp = function(response)
	{
	if (me.selected_event && me.selected_event.attendees && response) {
	// update attendee status
	for (var data, i=0; i < me.selected_event.attendees.length; i++) {
	data = me.selected_event.attendees[i];
	if (settings.identity.emails.indexOf(';'+data.email) >= 0)
	data.status = response.toUpperCase();
	}
	event_show_dialog(me.selected_event);

	// submit status change to server
	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('event', { action:'rsvp', e:me.selected_event, status:response });
	}
	}

	// post the given event data to server
	var update_event = function(action, data)
	{
	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('calendar/event', { action:action, e:data });

	// render event temporarily into the calendar
	if ((data.start && data.end) \|\| data.id) {
	var event = data.id ? $.extend(fc.fullCalendar('clientEvents', data.id)[0], data) : data;
	if (data.start)
	event.start = fromunixtime(data.start);
	if (data.end)
	event.end = fromunixtime(data.end);
	if (data.allday !== undefined)
	event.allDay = data.allday;
	event.editable = false;
	event.temp = true;
	event.className = 'fc-event-cal-'+data.calendar+' fc-event-temp';
	fc.fullCalendar(data.id ? 'updateEvent' : 'renderEvent', event);
	}
	};

	// mouse-click handler to check if the show dialog is still open and prevent default action
	var dialog_check = function(e)
	{
	var showd = $("#eventshow");
	if (showd.is(':visible') && !$(e.target).closest('.ui-dialog').length) {
	showd.dialog('close');
	e.stopImmediatePropagation();
	ignore_click = true;
	return false;
	}
	else if (ignore_click) {
	window.setTimeout(function(){ ignore_click = false; }, 20);
	return false;
	}
	return true;
	};

	// display confirm dialog when modifying/deleting an event
	var update_event_confirm = function(action, event, data)
	{
	if (!data) data = event;
	var decline = false, notify = false, html = '', cal = me.calendars[event.calendar];

	// event has attendees, ask whether to notify them
	if (has_attendees(event)) {
	if (is_organizer(event)) {
	notify = true;
	html += '<div class="message">' +
	'<label><input class="confirm-attendees-donotify" type="checkbox" checked="checked" value="1" name="notify" /> ' +
	rcmail.gettext((action == 'remove' ? 'sendcancellation' : 'sendnotifications'), 'calendar') +
	'</label></div>';
	}
	else if (action == 'remove' && is_attendee(event)) {
	decline = true;
	html += '<div class="message">' +
	'<label><input class="confirm-attendees-decline" type="checkbox" checked="checked" value="1" name="decline" /> ' +
	rcmail.gettext('itipdeclineevent', 'calendar') +
	'</label></div>';
	}
	else {
	html += '<div class="message">' + rcmail.gettext('localchangeswarning', 'calendar') + '</div>';
	}
	}

	// recurring event: user needs to select the savemode
	if (event.recurrence) {
	html += '<div class="message"><span class="ui-icon ui-icon-alert"></span>' +
	rcmail.gettext((action == 'remove' ? 'removerecurringeventwarning' : 'changerecurringeventwarning'), 'calendar') + '</div>' +
	'<div class="savemode">' +
	'<a href="#current" class="button">' + rcmail.gettext('currentevent', 'calendar') + '</a>' +
	'<a href="#future" class="button">' + rcmail.gettext('futurevents', 'calendar') + '</a>' +
	'<a href="#all" class="button">' + rcmail.gettext('allevents', 'calendar') + '</a>' +
	(action != 'remove' ? '<a href="#new" class="button">' + rcmail.gettext('saveasnew', 'calendar') + '</a>' : '') +
	'</div>';
	}

	// show dialog
	if (html) {
	var $dialog = $('<div>').html(html);

	$dialog.find('a.button').button().click(function(e){
	data._savemode = String(this.href).replace(/.+#/, '');
	if ($dialog.find('input.confirm-attendees-donotify').get(0))
	data._notify = notify && $dialog.find('input.confirm-attendees-donotify').get(0).checked ? 1 : 0;
	if (decline && $dialog.find('input.confirm-attendees-decline:checked'))
	data.decline = 1;
	update_event(action, data);
	$dialog.dialog("destroy").hide();
	return false;
	});

	var buttons = [{
	text: rcmail.gettext('cancel', 'calendar'),
	click: function() {
	$(this).dialog("close");
	}
	}];

	if (!event.recurrence) {
	buttons.push({
	text: rcmail.gettext((action == 'remove' ? 'remove' : 'save'), 'calendar'),
	click: function() {
	data._notify = notify && $dialog.find('input.confirm-attendees-donotify').get(0).checked ? 1 : 0;
	data.decline = decline && $dialog.find('input.confirm-attendees-decline:checked').length ? 1 : 0;
	update_event(action, data);
	$(this).dialog("close");
	}
	});
	}

	$dialog.dialog({
	modal: true,
	width: 460,
	dialogClass: 'warning',
	title: rcmail.gettext((action == 'remove' ? 'removeeventconfirm' : 'changeeventconfirm'), 'calendar'),
	buttons: buttons,
	close: function(){
	$dialog.dialog("destroy").hide();
	if (!rcmail.busy)
	fc.fullCalendar('refetchEvents');
	}
	}).addClass('event-update-confirm').show();

	return false;
	}
	// show regular confirm box when deleting
	else if (action == 'remove' && !cal.undelete) {
	if (!confirm(rcmail.gettext('deleteventconfirm', 'calendar')))
	return false;
	}

	// do update
	update_event(action, data);

	return true;
	};

	var update_agenda_toolbar = function()
	{
	$('#agenda-listrange').val(fc.fullCalendar('option', 'listRange'));
	$('#agenda-listsections').val(fc.fullCalendar('option', 'listSections'));
	}

	/* fullcalendar event handlers */

	var fc_event_render = function(event, element, view) {
	if (view.name != 'list' && view.name != 'table') {
	var prefix = event.sensitivity != 0 ? String(sensitivitylabels[event.sensitivity]).toUpperCase()+': ' : '';
	element.attr('title', prefix + event.title);
	}
	if (view.name != 'month') {
	if (event.location) {
	element.find('div.fc-event-title').after('<div class="fc-event-location">@ ' + Q(event.location) + '</div>');
	}
	if (event.sensitivity != 0)
	element.find('div.fc-event-time').append('<i class="fc-icon-sensitive"></i>');
	if (event.recurrence)
	element.find('div.fc-event-time').append('<i class="fc-icon-recurring"></i>');
	if (event.alarms)
	element.find('div.fc-event-time').append('<i class="fc-icon-alarms"></i>');
	}
	};


	/* public methods */

	// opens calendar day-view in a popup
	this.fisheye_view = function(date)
	{
	$('#fish-eye-view').dialog('close');

	// create list of active event sources
	var src, cals = {}, sources = [];
	for (var id in this.calendars) {
	src = $.extend({}, this.calendars[id]);
	src.editable = false;
	src.url = null;
	src.events = [];

	if (src.active) {
	cals[id] = src;
	sources.push(src);
	}
	}

	// copy events already loaded
	var events = fc.fullCalendar('clientEvents');
	for (var event, i=0; i< events.length; i++) {
	event = events[i];
	if (event.source && (src = cals[event.source.id])) {
	src.events.push(event);
	}
	}

	var h = $(window).height() - 50;
	var dialog = $('<div>')
	.attr('id', 'fish-eye-view')
	.dialog({
	modal: true,
	width: 680,
	height: h,
	title: $.fullCalendar.formatDate(date, 'dddd ' + settings['date_long']),
	close: function(){
	dialog.dialog("destroy");
	me.fisheye_date = null;
	}
	})
	.fullCalendar({
	header: { left: '', center: '', right: '' },
	height: h - 50,
	defaultView: 'agendaDay',
	date: date.getDate(),
	month: date.getMonth(),
	year: date.getFullYear(),
	ignoreTimezone: true, // will treat the given date strings as in local (browser's) timezone
	eventSources: sources,
	monthNames : settings['months'],
	monthNamesShort : settings['months_short'],
	dayNames : settings['days'],
	dayNamesShort : settings['days_short'],
	firstDay : settings['first_day'],
	firstHour : settings['first_hour'],
	slotMinutes : 60/settings['timeslots'],
	timeFormat: { '': settings['time_format'] },
	axisFormat : settings['time_format'],
	columnFormat: { day: 'dddd ' + settings['date_short'] },
	titleFormat: { day: 'dddd ' + settings['date_long'] },
	allDayText: rcmail.gettext('all-day', 'calendar'),
	currentTimeIndicator: settings.time_indicator,
	eventRender: fc_event_render,
	eventClick: function(event) {
	event_show_dialog(event);
	}
	});

	this.fisheye_date = date;
	};

	//public method to show the print dialog.
	this.print_calendars = function(view)
	{
	if (!view) view = fc.fullCalendar('getView').name;
	var date = fc.fullCalendar('getDate') \|\| new Date();
	var range = fc.fullCalendar('option', 'listRange');
	var sections = fc.fullCalendar('option', 'listSections');
	var printwin = window.open(rcmail.url('print', { view: view, date: date2unixtime(date), range: range, sections: sections, search: this.search_query }), "rc_print_calendars", "toolbar=no,location=yes,menubar=yes,resizable=yes,scrollbars=yes,width=800");
	window.setTimeout(function(){ printwin.focus() }, 50);
	};

	// public method to bring up the new event dialog
	this.add_event = function(templ) {
	if (this.selected_calendar) {
	var now = new Date();
	var date = fc.fullCalendar('getDate');
	if (typeof date != 'Date')
	date = now;
	date.setHours(now.getHours()+1);
	date.setMinutes(0);
	var end = new Date(date.getTime());
	end.setHours(date.getHours()+1);
	event_edit_dialog('new', $.extend({ start:date, end:end, allDay:false, calendar:this.selected_calendar }, templ \|\| {}));
	}
	};

	// delete the given event after showing a confirmation dialog
	this.delete_event = function(event) {
	// show confirm dialog for recurring events, use jquery UI dialog
	return update_event_confirm('remove', event, { id:event.id, calendar:event.calendar, attendees:event.attendees });
	};

	// opens a jquery UI dialog with event properties (or empty for creating a new calendar)
	this.calendar_edit_dialog = function(calendar)
	{
	// close show dialog first
	var $dialog = $("#calendarform").dialog('close');

	if (!calendar)
	calendar = { name:'', color:'cc0000', editable:true, showalarms:true };

	var form, name, color, alarms;

	$dialog.html(rcmail.get_label('loading'));
	$.ajax({
	type: 'GET',
	dataType: 'html',
	url: rcmail.url('calendar'),
	data: { action:(calendar.id ? 'form-edit' : 'form-new'), c:{ id:calendar.id } },
	success: function(data) {
	$dialog.html(data);
	// resize and reposition dialog window
	form = $('#calendarpropform');
	me.dialog_resize('#calendarform', form.height(), form.width());
	name = $('#calendar-name').prop('disabled', !calendar.editable).val(calendar.editname \|\| calendar.name);
	color = $('#calendar-color').val(calendar.color).miniColors({ value: calendar.color, colorValues:rcmail.env.mscolors });
	alarms = $('#calendar-showalarms').prop('checked', calendar.showalarms).get(0);
	name.select();
	}
	});

	// dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('save', 'calendar')] = function() {
	// form is not loaded
	if (!form \|\| !form.length)
	return;

	// TODO: do some input validation
	if (!name.val() \|\| name.val().length < 2) {
	alert(rcmail.gettext('invalidcalendarproperties', 'calendar'));
	name.select();
	return;
	}

	// post data to server
	var data = form.serializeJSON();
	if (data.color)
	data.color = data.color.replace(/^#/, '');
	if (calendar.id)
	data.id = calendar.id;
	if (alarms)
	data.showalarms = alarms.checked ? 1 : 0;

	me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
	rcmail.http_post('calendar', { action:(calendar.id ? 'edit' : 'new'), c:data });
	$dialog.dialog("close");
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: true,
	closeOnEscape: false,
	title: rcmail.gettext((calendar.id ? 'editcalendar' : 'createcalendar'), 'calendar'),
	close: function() {
	$dialog.html('').dialog("destroy").hide();
	},
	buttons: buttons,
	minWidth: 400,
	width: 420
	}).show();

	};

	this.calendar_remove = function(calendar)
	{
	if (confirm(rcmail.gettext('deletecalendarconfirm', 'calendar'))) {
	rcmail.http_post('calendar', { action:'remove', c:{ id:calendar.id } });
	return true;
	}
	return false;
	};

	this.calendar_destroy_source = function(id)
	{
	if (this.calendars[id]) {
	fc.fullCalendar('removeEventSource', this.calendars[id]);
	$(rcmail.get_folder_li(id, 'rcmlical')).remove();
	$('#edit-calendar option[value="'+id+'"]').remove();
	delete this.calendars[id];
	}
	};

	// open a dialog to upload an .ics file with events to be imported
	this.import_events = function(calendar)
	{
	// close show dialog first
	var $dialog = $("#eventsimport").dialog('close');
	var form = rcmail.gui_objects.importform;

	$('#event-import-calendar').val(calendar.id);

	var buttons = {};
	buttons[rcmail.gettext('import', 'calendar')] = function() {
	if (form && form.elements._data.value) {
	rcmail.async_upload_form(form, 'import_events', function(e) {
	rcmail.set_busy(false, null, me.saving_lock);
	});

	// display upload indicator
	me.saving_lock = rcmail.set_busy(true, 'uploading');
	}
	};

	buttons[rcmail.gettext('cancel', 'calendar')] = function() {
	$dialog.dialog("close");
	};

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: false,
	closeOnEscape: false,
	title: rcmail.gettext('importevents', 'calendar'),
	close: function() {
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	width: 520
	}).show();

	};

	// callback from server if import succeeded
	this.import_success = function(p)
	{
	$("#eventsimport").dialog('close');
	rcmail.set_busy(false, null, me.saving_lock);
	rcmail.gui_objects.importform.reset();

	if (p.refetch)
	this.refresh(p);
	};

	// show URL of the given calendar in a dialog box
	this.showurl = function(calendar)
	{
	var $dialog = $('#calendarurlbox').dialog('close');

	if (calendar.feedurl) {
	$dialog.dialog({
	resizable: true,
	closeOnEscape: true,
	title: rcmail.gettext('showurl', 'calendar'),
	close: function() {
	$dialog.dialog("destroy").hide();
	},
	width: 520
	}).show();

	$('#calfeedurl').val(calendar.feedurl).select();
	}
	};

	// refresh the calendar view after saving event data
	this.refresh = function(p)
	{
	var source = me.calendars[p.source];

	if (source && (p.refetch \|\| (p.update && !source.active))) {
	// activate event source if new event was added to an invisible calendar
	if (!source.active) {
	source.active = true;
	fc.fullCalendar('addEventSource', source);
	$('#' + rcmail.get_folder_li(source.id, 'rcmlical').id + ' input').prop('checked', true);
	}
	else
	fc.fullCalendar('refetchEvents', source);
	}
	// add/update single event object
	else if (source && p.update) {
	var event = p.update;
	event.temp = false;
	event.editable = source.editable;
	var existing = fc.fullCalendar('clientEvents', event.id);
	if (existing.length) {
	$.extend(existing[0], event);
	fc.fullCalendar('updateEvent', existing[0]);
	}
	else {
	event.source = source; // link with source
	fc.fullCalendar('renderEvent', event);
	}
	// refresh fish-eye view
	if (me.fisheye_date)
	me.fisheye_view(me.fisheye_date);
	}

	// remove temp events
	fc.fullCalendar('removeEvents', function(e){ return e.temp; });
	};


	/* event searching */

	// execute search
	this.quicksearch = function()
	{
	if (rcmail.gui_objects.qsearchbox) {
	var q = rcmail.gui_objects.qsearchbox.value;
	if (q != '') {
	var id = 'search-'+q;
	var sources = [];

	if (this._search_message)
	rcmail.hide_message(this._search_message);

	for (var sid in this.calendars) {
	if (this.calendars[sid]) {
	this.calendars[sid].url = this.calendars[sid].url.replace(/&q=.+/, '') + '&q='+escape(q);
	sources.push(sid);
	}
	}
	id += '@'+sources.join(',');

	// ignore if query didn't change
	if (this.search_request == id) {
	return;
	}
	// remember current view
	else if (!this.search_request) {
	this.default_view = fc.fullCalendar('getView').name;
	}

	this.search_request = id;
	this.search_query = q;

	// change to list view
	fc.fullCalendar('option', 'listSections', 'month')
	.fullCalendar('option', 'listRange', Math.max(60, settings['agenda_range']))
	.fullCalendar('changeView', 'table');

	update_agenda_toolbar();

	// refetch events with new url (if not already triggered by changeView)
	if (!this.is_loading)
	fc.fullCalendar('refetchEvents');
	}
	else // empty search input equals reset
	this.reset_quicksearch();
	}
	};

	// reset search and get back to normal event listing
	this.reset_quicksearch = function()
	{
	$(rcmail.gui_objects.qsearchbox).val('');

	if (this._search_message)
	rcmail.hide_message(this._search_message);

	if (this.search_request) {
	// hide bottom links of agenda view
	fc.find('.fc-list-content > .fc-listappend').hide();

	// restore original event sources and view mode from fullcalendar
	fc.fullCalendar('option', 'listSections', settings['agenda_sections'])
	.fullCalendar('option', 'listRange', settings['agenda_range']);

	update_agenda_toolbar();

	for (var sid in this.calendars) {
	if (this.calendars[sid])
	this.calendars[sid].url = this.calendars[sid].url.replace(/&q=.+/, '');
	}
	if (this.default_view)
	fc.fullCalendar('changeView', this.default_view);

	if (!this.is_loading)
	fc.fullCalendar('refetchEvents');

	this.search_request = this.search_query = null;
	}
	};

	// callback if all sources have been fetched from server
	this.events_loaded = function(count)
	{
	var addlinks, append = '';

	// enhance list view when searching
	if (this.search_request) {
	if (!count) {
	this._search_message = rcmail.display_message(rcmail.gettext('searchnoresults', 'calendar'), 'notice');
	append = '<div class="message">' + rcmail.gettext('searchnoresults', 'calendar') + '</div>';
	}
	append += '<div class="fc-bottomlinks formlinks"></div>';
	addlinks = true;
	}

	if (fc.fullCalendar('getView').name == 'table') {
	var container = fc.find('.fc-list-content > .fc-listappend');
	if (append) {
	if (!container.length)
	container = $('<div class="fc-listappend"></div>').appendTo(fc.find('.fc-list-content'));
	container.html(append).show();
	}
	else if (container.length)
	container.hide();

	// add links to adjust search date range
	if (addlinks) {
	var lc = container.find('.fc-bottomlinks');
	$('<a>').attr('href', '#').html(rcmail.gettext('searchearlierdates', 'calendar')).appendTo(lc).click(function(){
	fc.fullCalendar('incrementDate', 0, -1, 0);
	});
	lc.append(" ");
	$('<a>').attr('href', '#').html(rcmail.gettext('searchlaterdates', 'calendar')).appendTo(lc).click(function(){
	var range = fc.fullCalendar('option', 'listRange');
	if (range < 90) {
	fc.fullCalendar('option', 'listRange', fc.fullCalendar('option', 'listRange') + 30).fullCalendar('render');
	update_agenda_toolbar();
	}
	else
	fc.fullCalendar('incrementDate', 0, 1, 0);
	});
	}
	}

	if (this.fisheye_date)
	this.fisheye_view(this.fisheye_date);
	};

	// resize and reposition (center) the dialog window
	this.dialog_resize = function(id, height, width)
	{
	var win = $(window), w = win.width(), h = win.height();
	$(id).dialog('option', { height: Math.min(h-20, height+130), width: Math.min(w-20, width+50) })
	.dialog('option', 'position', ['center', 'center']); // only works in a separate call (!?)
	};

	// adjust calendar view size
	this.view_resize = function()
	{
	var footer = fc.fullCalendar('getView').name == 'table' ? $('#agendaoptions').outerHeight() : 0;
	fc.fullCalendar('option', 'height', $('#calendar').height() - footer);
	};


	/* startup code */

	// create list of event sources AKA calendars
	this.calendars = {};
	var li, cal, active, event_sources = [];
	for (var id in rcmail.env.calendars) {
	cal = rcmail.env.calendars[id];
	this.calendars[id] = $.extend({
	url: "./?_task=calendar&_action=load_events&source="+escape(id),
	editable: !cal.readonly,
	className: 'fc-event-cal-'+id,
	id: id
	}, cal);

	this.calendars[id].color = settings.event_coloring % 2 ? '' : '#' + cal.color;

	if ((active = cal.active \|\| false)) {
	event_sources.push(this.calendars[id]);
	}

	// init event handler on calendar list checkbox
	if ((li = rcmail.get_folder_li(id, 'rcmlical'))) {
	$('#'+li.id+' input').click(function(e){
	var id = $(this).data('id');
	if (me.calendars[id]) { // add or remove event source on click
	var action;
	if (this.checked) {
	action = 'addEventSource';
	me.calendars[id].active = true;
	}
	else {
	action = 'removeEventSource';
	me.calendars[id].active = false;
	}

	// add/remove event source
	fc.fullCalendar(action, me.calendars[id]);
	rcmail.http_post('calendar', { action:'subscribe', c:{ id:id, active:me.calendars[id].active?1:0 } });
	}
	}).data('id', id).get(0).checked = active;

	$(li).click(function(e){
	var id = $(this).data('id');
	rcmail.select_folder(id, 'rcmlical');
	rcmail.enable_command('calendar-edit', true);
	rcmail.enable_command('calendar-remove', 'events-import', 'calendar-showurl', true);
	me.selected_calendar = id;
	})
	.dblclick(function(){ me.calendar_edit_dialog(me.calendars[me.selected_calendar]); })
	.data('id', id);
	}

	if (!cal.readonly && !this.selected_calendar) {
	this.selected_calendar = id;
	rcmail.enable_command('addevent', true);
	}
	}

	// select default calendar
	if (settings.default_calendar && this.calendars[settings.default_calendar] && !this.calendars[settings.default_calendar].readonly)
	this.selected_calendar = settings.default_calendar;

	var viewdate = new Date();
	if (rcmail.env.date)
	viewdate.setTime(fromunixtime(rcmail.env.date));

	// initalize the fullCalendar plugin
	var fc = $('#calendar').fullCalendar({
	header: {
	left: 'prev,next today',
	center: 'title',
	right: 'agendaDay,agendaWeek,month,table'
	},
	aspectRatio: 1,
	date: viewdate.getDate(),
	month: viewdate.getMonth(),
	year: viewdate.getFullYear(),
	ignoreTimezone: true, // will treat the given date strings as in local (browser's) timezone
	height: $('#calendar').height(),
	eventSources: event_sources,
	monthNames : settings['months'],
	monthNamesShort : settings['months_short'],
	dayNames : settings['days'],
	dayNamesShort : settings['days_short'],
	firstDay : settings['first_day'],
	firstHour : settings['first_hour'],
	slotMinutes : 60/settings['timeslots'],
	timeFormat: {
	'': settings['time_format'],
	agenda: settings['time_format'] + '{ - ' + settings['time_format'] + '}',
	list: settings['time_format'] + '{ - ' + settings['time_format'] + '}',
	table: settings['time_format'] + '{ - ' + settings['time_format'] + '}'
	},
	axisFormat : settings['time_format'],
	columnFormat: {
	month: 'ddd', // Mon
	week: 'ddd ' + settings['date_short'], // Mon 9/7
	day: 'dddd ' + settings['date_short'], // Monday 9/7
	table: settings['date_agenda']
	},
	titleFormat: {
	month: 'MMMM yyyy',
	week: settings['dates_long'],
	day: 'dddd ' + settings['date_long'],
	table: settings['dates_long']
	},
	listPage: 1, // advance one day in agenda view
	listRange: settings['agenda_range'],
	listSections: settings['agenda_sections'],
	tableCols: ['handle', 'date', 'time', 'title', 'location'],
	defaultView: rcmail.env.view \|\| settings['default_view'],
	allDayText: rcmail.gettext('all-day', 'calendar'),
	buttonText: {
	prev: (bw.ie6 ? ' << ' : ' ◄ '),
	next: (bw.ie6 ? ' >> ' : ' ► '),
	today: settings['today'],
	day: rcmail.gettext('day', 'calendar'),
	week: rcmail.gettext('week', 'calendar'),
	month: rcmail.gettext('month', 'calendar'),
	table: rcmail.gettext('agenda', 'calendar')
	},
	listTexts: {
	until: rcmail.gettext('until', 'calendar'),
	past: rcmail.gettext('pastevents', 'calendar'),
	today: rcmail.gettext('today', 'calendar'),
	tomorrow: rcmail.gettext('tomorrow', 'calendar'),
	thisWeek: rcmail.gettext('thisweek', 'calendar'),
	nextWeek: rcmail.gettext('nextweek', 'calendar'),
	thisMonth: rcmail.gettext('thismonth', 'calendar'),
	nextMonth: rcmail.gettext('nextmonth', 'calendar'),
	future: rcmail.gettext('futureevents', 'calendar'),
	week: rcmail.gettext('weekofyear', 'calendar')
	},
	selectable: true,
	selectHelper: false,
	currentTimeIndicator: settings.time_indicator,
	loading: function(isLoading) {
	me.is_loading = isLoading;
	this._rc_loading = rcmail.set_busy(isLoading, 'loading', this._rc_loading);
	// trigger callback
	if (!isLoading)
	me.events_loaded($(this).fullCalendar('clientEvents').length);
	},
	// event rendering
	eventRender: fc_event_render,
	// render element indicating more (invisible) events
	overflowRender: function(data, element) {
	element.html(rcmail.gettext('andnmore', 'calendar').replace('$nr', data.count))
	.click(function(e){ me.fisheye_view(data.date); });
	},
	// callback for date range selection
	select: function(start, end, allDay, e, view) {
	var range_select = (!allDay \|\| start.getDate() != end.getDate())
	if (dialog_check(e) && range_select)
	event_edit_dialog('new', { start:start, end:end, allDay:allDay, calendar:me.selected_calendar });
	if (range_select \|\| ignore_click)
	view.calendar.unselect();
	},
	// callback for clicks in all-day box
	dayClick: function(date, allDay, e, view) {
	var now = new Date().getTime();
	if (now - day_clicked_ts < 400 && day_clicked == date.getTime()) { // emulate double-click on day
	var enddate = new Date(); enddate.setTime(date.getTime() + DAY_MS - 60000);
	return event_edit_dialog('new', { start:date, end:enddate, allDay:allDay, calendar:me.selected_calendar });
	}

	if (!ignore_click) {
	view.calendar.gotoDate(date);
	if (day_clicked && new Date(day_clicked).getMonth() != date.getMonth())
	view.calendar.select(date, date, allDay);
	}
	day_clicked = date.getTime();
	day_clicked_ts = now;
	},
	// callback when a specific event is clicked
	eventClick: function(event) {
	if (!event.temp)
	event_show_dialog(event);
	},
	// callback when an event was dragged and finally dropped
	eventDrop: function(event, dayDelta, minuteDelta, allDay, revertFunc) {
	if (event.end == null \|\| event.end.getTime() < event.start.getTime()) {
	event.end = new Date(event.start.getTime() + (allDay ? DAY_MS : HOUR_MS));
	}
	// moved to all-day section: set times to 12:00 - 13:00
	- if (allDay && !event.allday) {
	+ if (allDay && !event.allDay) {
	event.start.setHours(12);
	event.start.setMinutes(0);
	event.start.setSeconds(0);
	event.end.setHours(13);
	event.end.setMinutes(0);
	event.end.setSeconds(0);
	}
	// moved from all-day section: set times to working hours
	- else if (event.allday && !allDay) {
	+ else if (event.allDay && !allDay) {
	var newstart = event.start.getTime();
	revertFunc(); // revert to get original duration
	var numdays = Math.max(1, Math.round((event.end.getTime() - event.start.getTime()) / DAY_MS)) - 1;
	event.start = new Date(newstart);
	event.end = new Date(newstart + numdays * DAY_MS);
	event.end.setHours(settings['work_end'] \|\| 18);
	event.end.setMinutes(0);

	if (event.end.getTime() < event.start.getTime())
	event.end = new Date(newstart + HOUR_MS);
	}

	// send move request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2unixtime(event.start),
	end: date2unixtime(event.end),
	allday: allDay?1:0
	};
	update_event_confirm('move', event, data);
	},
	// callback for event resizing
	eventResize: function(event, delta) {
	// sanitize event dates
	if (event.allDay)
	event.start.setHours(12);
	if (!event.end \|\| event.end.getTime() < event.start.getTime())
	event.end = new Date(event.start.getTime() + HOUR_MS);

	// send resize request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2unixtime(event.start),
	end: date2unixtime(event.end)
	};
	update_event_confirm('resize', event, data);
	},
	viewDisplay: function(view) {
	$('#agendaoptions')[view.name == 'table' ? 'show' : 'hide']();
	if (minical) {
	window.setTimeout(function(){ minical.datepicker('setDate', fc.fullCalendar('getDate')); }, exec_deferred);
	if (view.name != current_view)
	me.view_resize();
	current_view = view.name;
	}
	},
	viewRender: function(view) {
	if (fc && view.name == 'month')
	fc.fullCalendar('option', 'maxHeight', Math.floor((view.element.parent().height()-18) / 6) - 35);
	}
	});

	// format time string
	var formattime = function(hour, minutes, start) {
	var time, diff, unit, duration = '', d = new Date();
	d.setHours(hour);
	d.setMinutes(minutes);
	time = $.fullCalendar.formatDate(d, settings['time_format']);
	if (start) {
	diff = Math.floor((d.getTime() - start.getTime()) / 60000);
	if (diff > 0) {
	unit = 'm';
	if (diff >= 60) {
	unit = 'h';
	diff = Math.round(diff / 3) / 20;
	}
	duration = ' (' + diff + unit + ')';
	}
	}
	return [time, duration];
	};

	var autocomplete_times = function(p, callback) {
	/* Time completions */
	var result = [];
	var now = new Date();
	var st, start = (String(this.element.attr('id')).indexOf('endtime') > 0
	&& (st = $('#edit-starttime').val())
	&& $('#edit-startdate').val() == $('#edit-enddate').val())
	? parse_datetime(st, '') : null;
	var full = p.term - 1 > 0 \|\| p.term.length > 1;
	var hours = start ? start.getHours() :
	(full ? parse_datetime(p.term, '') : now).getHours();
	var step = 15;
	var minutes = hours * 60 + (full ? 0 : now.getMinutes());
	var min = Math.ceil(minutes / step) * step % 60;
	var hour = Math.floor(Math.ceil(minutes / step) * step / 60);
	// list hours from 0:00 till now
	for (var h = start ? start.getHours() : 0; h < hours; h++)
	result.push(formattime(h, 0, start));
	// list 15min steps for the next two hours
	for (; h < hour + 2 && h < 24; h++) {
	while (min < 60) {
	result.push(formattime(h, min, start));
	min += step;
	}
	min = 0;
	}
	// list the remaining hours till 23:00
	while (h < 24)
	result.push(formattime((h++), 0, start));

	return callback(result);
	};

	var autocomplete_open = function(event, ui) {
	// scroll to current time
	var $this = $(this);
	var widget = $this.autocomplete('widget');
	var menu = $this.data('autocomplete').menu;
	var amregex = /^(.+)(a[.m]*)/i;
	var pmregex = /^(.+)(a[.m]*)/i;
	var val = $(this).val().replace(amregex, '0:$1').replace(pmregex, '1:$1');
	var li, html;
	widget.css('width', '10em');
	widget.children().each(function(){
	li = $(this);
	html = li.children().first().html().replace(/\s+$.+$$/, '').replace(amregex, '0:$1').replace(pmregex, '1:$1');
	if (html == val)
	menu.activate($.Event({ type:'keypress' }), li);
	});
	};

	// if start date is changed, shift end date according to initial duration
	var shift_enddate = function(dateText) {
	var newstart = parse_datetime('0', dateText);
	var newend = new Date(newstart.getTime() + $('#edit-startdate').data('duration') * 1000);
	$('#edit-enddate').val($.fullCalendar.formatDate(newend, me.settings['date_format']));
	event_times_changed();
	};


	var minical;
	var init_calendar_ui = function()
	{
	// initialize small calendar widget using jQuery UI datepicker
	minical = $('#datepicker').datepicker($.extend(datepicker_settings, {
	inline: true,
	showWeek: true,
	changeMonth: false, // maybe enable?
	changeYear: false, // maybe enable?
	onSelect: function(dateText, inst) {
	ignore_click = true;
	var d = minical.datepicker('getDate'); //parse_datetime('0:0', dateText);
	fc.fullCalendar('gotoDate', d).fullCalendar('select', d, d, true);
	},
	onChangeMonthYear: function(year, month, inst) {
	minical.data('year', year).data('month', month);
	},
	beforeShowDay: function(date) {
	var view = fc.fullCalendar('getView');
	var active = view.visStart && date.getTime() >= view.visStart.getTime() && date.getTime() < view.visEnd.getTime();
	return [ true, (active ? 'ui-datepicker-activerange ui-datepicker-active-' + view.name : ''), ''];
	}
	})) // set event handler for clicks on calendar week cell of the datepicker widget
	.click(function(e) {
	var cell = $(e.target);
	if (e.target.tagName == 'TD' && cell.hasClass('ui-datepicker-week-col')) {
	var base_date = minical.datepicker('getDate');
	if (minical.data('month'))
	base_date.setMonth(minical.data('month')-1);
	if (minical.data('year'))
	base_date.setYear(minical.data('year'));
	base_date.setHours(12);
	var day_off = base_date.getDay() - 1;
	if (day_off < 0) day_off = 6;
	var base_kw = $.datepicker.iso8601Week(base_date);
	var kw = parseInt(cell.html());
	var diff = (kw - base_kw) * 7 * DAY_MS;
	// select monday of the chosen calendar week
	var date = new Date(base_date.getTime() - day_off * DAY_MS + diff);
	fc.fullCalendar('gotoDate', date).fullCalendar('setDate', date).fullCalendar('changeView', 'agendaWeek');
	minical.datepicker('setDate', date);
	}
	});

	// init event dialog
	$('#eventtabs').tabs({
	show: function(event, ui) {
	if (ui.panel.id == 'event-tab-3') {
	$('#edit-attendee-name').select();
	// update free-busy status if needed
	if (freebusy_ui.needsupdate && me.selected_event)
	update_freebusy_status(me.selected_event);
	// add current user as organizer if non added yet
	if (!event_attendees.length) {
	add_attendee($.extend({ role:'ORGANIZER' }, settings.identity));
	$('#edit-attendees-form .attendees-invitebox').show();
	}
	}
	}
	});
	$('#edit-enddate, input.edit-alarm-date').datepicker(datepicker_settings);
	$('#edit-startdate').datepicker(datepicker_settings).datepicker('option', 'onSelect', shift_enddate).change(function(){ shift_enddate(this.value); });
	$('#edit-enddate').datepicker('option', 'onSelect', event_times_changed).change(event_times_changed);
	$('#edit-allday').click(function(){ $('#edit-starttime, #edit-endtime')[(this.checked?'hide':'show')](); event_times_changed(); });

	// configure drop-down menu on time input fields based on jquery UI autocomplete
	$('#edit-starttime, #edit-endtime, input.edit-alarm-time')
	.attr('autocomplete', "off")
	.autocomplete({
	delay: 100,
	minLength: 1,
	source: autocomplete_times,
	open: autocomplete_open,
	change: event_times_changed,
	select: function(event, ui) {
	$(this).val(ui.item[0]);
	return false;
	}
	})
	.click(function() { // show drop-down upon clicks
	$(this).autocomplete('search', $(this).val() ? $(this).val().replace(/\D.*/, "") : " ");
	}).each(function(){
	$(this).data('autocomplete')._renderItem = function(ul, item) {
	return $('<li>')
	.data('item.autocomplete', item)
	.append('<a>' + item[0] + item[1] + '</a>')
	.appendTo(ul);
	};
	});

	// register events on alarm fields
	$('select.edit-alarm-type').change(function(){
	$(this).parent().find('span.edit-alarm-values')[(this.selectedIndex>0?'show':'hide')]();
	});
	$('select.edit-alarm-offset').change(function(){
	var mode = $(this).val() == '@' ? 'show' : 'hide';
	$(this).parent().find('.edit-alarm-date, .edit-alarm-time')[mode]();
	$(this).parent().find('.edit-alarm-value').prop('disabled', mode == 'show');
	});

	// toggle recurrence frequency forms
	$('#edit-recurrence-frequency').change(function(e){
	var freq = $(this).val().toLowerCase();
	$('.recurrence-form').hide();
	if (freq)
	$('#recurrence-form-'+freq+', #recurrence-form-until').show();
	});
	$('#edit-recurrence-enddate').datepicker(datepicker_settings).click(function(){ $("#edit-recurrence-repeat-until").prop('checked', true) });
	$('#edit-recurrence-repeat-times').change(function(e){ $('#edit-recurrence-repeat-count').prop('checked', true); });

	// init attendees autocompletion
	var ac_props;
	// parallel autocompletion
	if (rcmail.env.autocomplete_threads > 0) {
	ac_props = {
	threads: rcmail.env.autocomplete_threads,
	sources: rcmail.env.autocomplete_sources
	};
	}
	rcmail.init_address_input_events($('#edit-attendee-name'), ac_props);
	rcmail.addEventListener('autocomplete_insert', function(e){ $('#edit-attendee-add').click(); });

	$('#edit-attendee-add').click(function(){
	var input = $('#edit-attendee-name');
	rcmail.ksearch_blur();
	if (add_attendees(input.val())) {
	input.val('');
	}
	});

	// keep these two checkboxes in sync
	$('#edit-attendees-donotify, #edit-attendees-invite').click(function(){
	$('#edit-attendees-donotify, #edit-attendees-invite').prop('checked', this.checked);
	});

	$('#edit-attendee-schedule').click(function(){
	event_freebusy_dialog();
	});

	$('#shedule-freebusy-prev').html(bw.ie6 ? '<<' : '◄').button().click(function(){ render_freebusy_grid(-1); });
	$('#shedule-freebusy-next').html(bw.ie6 ? '>>' : '►').button().click(function(){ render_freebusy_grid(1); }).parent().buttonset();

	$('#shedule-find-prev').button().click(function(){ freebusy_find_slot(-1); });
	$('#shedule-find-next').button().click(function(){ freebusy_find_slot(1); });

	$('#schedule-freebusy-workinghours').click(function(){
	freebusy_ui.workinhoursonly = this.checked;
	$('#workinghourscss').remove();
	if (this.checked)
	$('<style type="text/css" id="workinghourscss"> td.offhours { opacity:0.3; filter:alpha(opacity=30) } </style>').appendTo('head');
	});

	$('#event-rsvp input.button').click(function(){
	event_rsvp($(this).attr('rel'))
	})

	$('#agenda-listrange').change(function(e){
	settings['agenda_range'] = parseInt($(this).val());
	fc.fullCalendar('option', 'listRange', settings['agenda_range']).fullCalendar('render');
	// TODO: save new settings in prefs
	}).val(settings['agenda_range']);

	$('#agenda-listsections').change(function(e){
	settings['agenda_sections'] = $(this).val();
	fc.fullCalendar('option', 'listSections', settings['agenda_sections']).fullCalendar('render');
	// TODO: save new settings in prefs
	}).val(fc.fullCalendar('option', 'listSections'));

	// hide event dialog when clicking somewhere into document
	$(document).bind('mousedown', dialog_check);

	rcmail.set_busy(false, 'loading', ui_loading);
	}

	// initialize more UI elements (deferred)
	window.setTimeout(init_calendar_ui, exec_deferred);

	// add proprietary css styles if not IE
	if (!bw.ie)
	$('div.fc-content').addClass('rcube-fc-content');

	// IE supresses 2nd click event when double-clicking
	if (bw.ie && bw.vendver < 9) {
	$('div.fc-content').bind('dblclick', function(e){
	if (!$(this).hasClass('fc-widget-header') && fc.fullCalendar('getView').name != 'table') {
	var date = fc.fullCalendar('getDate');
	var enddate = new Date(); enddate.setTime(date.getTime() + DAY_MS - 60000);
	event_edit_dialog('new', { start:date, end:enddate, allDay:true, calendar:me.selected_calendar });
	}
	});
	}
	} // end rcube_calendar class


	/* calendar plugin initialization */
	window.rcmail && rcmail.addEventListener('init', function(evt) {

	// configure toolbar buttons
	rcmail.register_command('addevent', function(){ cal.add_event(); }, true);
	rcmail.register_command('print', function(){ cal.print_calendars(); }, true);

	// configure list operations
	rcmail.register_command('calendar-create', function(){ cal.calendar_edit_dialog(null); }, true);
	rcmail.register_command('calendar-edit', function(){ cal.calendar_edit_dialog(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('calendar-remove', function(){ cal.calendar_remove(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('events-import', function(){ cal.import_events(cal.calendars[cal.selected_calendar]); }, false);
	rcmail.register_command('calendar-showurl', function(){ cal.showurl(cal.calendars[cal.selected_calendar]); }, false);

	// search and export events
	rcmail.register_command('export', function(){ rcmail.goto_url('export_events', { source:cal.selected_calendar }); }, true);
	rcmail.register_command('search', function(){ cal.quicksearch(); }, true);
	rcmail.register_command('reset-search', function(){ cal.reset_quicksearch(); }, true);

	// register callback commands
	rcmail.addEventListener('plugin.display_alarms', function(alarms){ cal.display_alarms(alarms); });
	rcmail.addEventListener('plugin.destroy_source', function(p){ cal.calendar_destroy_source(p.id); });
	rcmail.addEventListener('plugin.unlock_saving', function(p){ rcmail.set_busy(false, null, cal.saving_lock); });
	rcmail.addEventListener('plugin.refresh_calendar', function(p){ cal.refresh(p); });
	rcmail.addEventListener('plugin.import_success', function(p){ cal.import_success(p); });

	// let's go
	var cal = new rcube_calendar_ui(rcmail.env.calendar_settings);

	$(window).resize(function(e) {
	// check target due to bugs in jquery
	// http://bugs.jqueryui.com/ticket/7514
	// http://bugs.jquery.com/ticket/9841
	if (e.target == window) {
	cal.view_resize();
	}
	}).resize();

	// show calendars list when ready
	$('#calendars').css('visibility', 'inherit');

	// show toolbar
	$('#toolbar').show();

	});
	diff --git a/plugins/calendar/drivers/kolab/kolab_calendar.php b/plugins/calendar/drivers/kolab/kolab_calendar.php
	index ade85e9b..ea08224f 100644
	--- a/plugins/calendar/drivers/kolab/kolab_calendar.php
	+++ b/plugins/calendar/drivers/kolab/kolab_calendar.php
	@@ -1,562 +1,508 @@
	<?php

	/**
	* Kolab calendar storage class
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2012, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/


	class kolab_calendar
	{
	const COLOR_KEY_SHARED = '/shared/vendor/kolab/color';
	const COLOR_KEY_PRIVATE = '/shared/vendor/kolab/color';

	public $id;
	public $ready = false;
	public $readonly = true;
	public $attachments = true;
	public $alarms = false;
	public $categories = array();
	public $storage;

	private $cal;
	private $events;
	private $id2uid;
	private $imap_folder = 'INBOX/Calendar';
	private $search_fields = array('title', 'description', 'location', '_attendees');
	private $sensitivity_map = array('public', 'private', 'confidential');


	/**
	* Default constructor
	*/
	public function __construct($imap_folder, $calendar)
	{
	$this->cal = $calendar;

	if (strlen($imap_folder))
	$this->imap_folder = $imap_folder;

	// ID is derrived from folder name
	$this->id = kolab_storage::folder_id($this->imap_folder);

	// fetch objects from the given IMAP folder
	$this->storage = kolab_storage::get_folder($this->imap_folder);
	- $this->ready = !PEAR::isError($this->storage);
	+ $this->ready = $this->storage && !PEAR::isError($this->storage);

	// Set readonly and alarms flags according to folder permissions
	if ($this->ready) {
	if ($this->get_owner() == $_SESSION['username']) {
	$this->readonly = false;
	$this->alarms = true;
	}
	else {
	$rights = $this->storage->get_acl();
	- if (!PEAR::isError($rights)) {
	+ if ($rights && !PEAR::isError($rights)) {
	if (strpos($rights, 'i') !== false)
	$this->readonly = false;
	}
	}

	// user-specific alarms settings win
	$prefs = $this->cal->rc->config->get('kolab_calendars', array());
	if (isset($prefs[$this->id]['showalarms']))
	$this->alarms = $prefs[$this->id]['showalarms'];
	}
	}


	/**
	* Getter for a nice and human readable name for this calendar
	* See http://wiki.kolab.org/UI-Concepts/Folder-Listing for reference
	*
	* @return string Name of this calendar
	*/
	public function get_name()
	{
	$folder = kolab_storage::object_name($this->imap_folder, $this->namespace);
	return $folder;
	}


	/**
	* Getter for the IMAP folder name
	*
	* @return string Name of the IMAP folder
	*/
	public function get_realname()
	{
	return $this->imap_folder;
	}


	/**
	* Getter for the IMAP folder owner
	*
	* @return string Name of the folder owner
	*/
	public function get_owner()
	{
	return $this->storage->get_owner();
	}


	/**
	* Getter for the name of the namespace to which the IMAP folder belongs
	*
	* @return string Name of the namespace (personal, other, shared)
	*/
	public function get_namespace()
	{
	return $this->storage->get_namespace();
	}


	/**
	* Getter for the top-end calendar folder name (not the entire path)
	*
	* @return string Name of this calendar
	*/
	public function get_foldername()
	{
	$parts = explode('/', $this->imap_folder);
	return rcube_charset::convert(end($parts), 'UTF7-IMAP');
	}

	/**
	* Return color to display this calendar
	*/
	public function get_color()
	{
	// color is defined in folder METADATA
	$metadata = $this->storage->get_metadata(array(self::COLOR_KEY_PRIVATE, self::COLOR_KEY_SHARED));
	if (($color = $metadata[self::COLOR_KEY_PRIVATE]) \|\| ($color = $metadata[self::COLOR_KEY_SHARED])) {
	return $color;
	}

	// calendar color is stored in user prefs (temporary solution)
	$prefs = $this->cal->rc->config->get('kolab_calendars', array());

	if (!empty($prefs[$this->id]) && !empty($prefs[$this->id]['color']))
	return $prefs[$this->id]['color'];

	return 'cc0000';
	}

	/**
	* Return the corresponding kolab_storage_folder instance
	*/
	public function get_folder()
	{
	return $this->storage;
	}

	/**
	* Getter for the attachment body
	*/
	public function get_attachment_body($id)
	{
	return $this->storage->getAttachment($id);
	}


	/**
	* Getter for a single event object
	*/
	public function get_event($id)
	{
	$this->_fetch_events();

	// event not found, maybe a recurring instance is requested
	if (!$this->events[$id]) {
	$master_id = preg_replace('/-\d+$/', '', $id);
	if ($this->events[$master_id] && $this->events[$master_id]['recurrence']) {
	$master = $this->events[$master_id];
	$this->_get_recurring_events($master, $master['start'], $master['start'] + 86400 * 365 * 10, $id);
	}
	}

	return $this->events[$id];
	}


	/**
	* @param integer Event's new start (unix timestamp)
	* @param integer Event's new end (unix timestamp)
	* @param string Search query (optional)
	* @param boolean Strip virtual events (optional)
	* @return array A list of event records
	*/
	public function list_events($start, $end, $search = null, $virtual = 1)
	{
	$this->_fetch_events();

	if (!empty($search))
	$search = mb_strtolower($search);

	$events = array();
	foreach ($this->events as $id => $event) {
	// remember seen categories
	if ($event['categories'])
	$this->categories[$event['categories']]++;

	// filter events by search query
	if (!empty($search)) {
	$hit = false;
	foreach ($this->search_fields as $col) {
	$sval = is_array($col) ? $event[$col[0]][$col[1]] : $event[$col];
	if (empty($sval))
	continue;

	// do a simple substring matching (to be improved)
	$val = mb_strtolower($sval);
	if (strpos($val, $search) !== false) {
	$hit = true;
	break;
	}
	}

	if (!$hit) // skip this event if not match with search term
	continue;
	}

	// list events in requested time window
	if ($event['start'] <= $end && $event['end'] >= $start) {
	unset($event['_attendees']);
	$events[] = $event;
	}

	// resolve recurring events
	if ($event['recurrence'] && $virtual == 1) {
	unset($event['_attendees']);
	$events = array_merge($events, $this->_get_recurring_events($event, $start, $end));
	}
	}

	return $events;
	}


	/**
	* Create a new event record
	*
	* @see calendar_driver::new_event()
	*
	* @return mixed The created record ID on success, False on error
	*/
	public function insert_event($event)
	{
	if (!is_array($event))
	return false;

	//generate new event from RC input
	$object = $this->_from_rcube_event($event);
	$saved = $this->storage->save($object, 'event');

	- if (PEAR::isError($saved)) {
	+ if (!$saved \|\| PEAR::isError($saved)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving event object to Kolab server:" . $saved->getMessage()),
	true, false);
	$saved = false;
	}
	else {
	$event['id'] = $event['uid'];
	$this->events[$event['uid']] = $event;
	}

	return $saved;
	}

	/**
	* Update a specific event record
	*
	* @see calendar_driver::new_event()
	* @return boolean True on success, False on error
	*/

	public function update_event($event)
	{
	$updated = false;
	- $old = $this->storage->getObject($event['id']);
	- if (PEAR::isError($old))
	+ $old = $this->storage->get_object($event['id']);
	+ if (!$old \|\| PEAR::isError($old))
	return false;

	$old['recurrence'] = ''; # clear old field, could have been removed in new, too
	$object = $this->_from_rcube_event($event, $old);
	$saved = $this->storage->save($object, 'event', $event['id']);

	- if (PEAR::isError($saved)) {
	+ if (!$saved \|\| PEAR::isError($saved)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving event object to Kolab server:" . $saved->getMessage()),
	true, false);
	}
	else {
	$updated = true;
	$this->events[$event['id']] = $this->_to_rcube_event($object);
	}

	return $updated;
	}

	/**
	* Delete an event record
	*
	* @see calendar_driver::remove_event()
	* @return boolean True on success, False on error
	*/
	public function delete_event($event, $force = true)
	{
	- $deleted = false;
	+ $deleted = $this->storage->delete($event['id'], $force);

	- if (!$force) {
	- // Get IMAP object ID
	- $imap_uid = $this->storage->_getStorageId($event['id']);
	- }
	-
	- $deleteme = $this->storage->delete($event['id'], $force);
	-
	- if (PEAR::isError($deleteme)) {
	+ if (!$deleted \|\| PEAR::isError($deleted)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	- 'message' => "Error deleting event object from Kolab server:" . $deleteme->getMessage()),
	+ 'message' => "Error deleting event object from Kolab server"),
	true, false);
	}
	- else {
	- // Save IMAP object ID in session, will be used for restore action
	- if ($imap_uid)
	- $_SESSION['kolab_delete_uids'][$event['id']] = $imap_uid;
	-
	- $deleted = true;
	- }

	return $deleted;
	}

	/**
	* Restore deleted event record
	*
	* @see calendar_driver::undelete_event()
	* @return boolean True on success, False on error
	*/
	public function restore_event($event)
	{
	- $imap_uid = $_SESSION['kolab_delete_uids'][$event['id']];
	-
	- if (!$imap_uid)
	- return false;
	-
	- $session = &Horde_Kolab_Session::singleton();
	- $imap = &$session->getImap();
	-
	- if (is_object($imap) && is_a($imap, 'PEAR_Error')) {
	- $error = $imap;
	- }
	- else {
	- $result = $imap->select($this->imap_folder);
	- if (is_object($result) && is_a($result, 'PEAR_Error')) {
	- $error = $result;
	- }
	- else {
	- $result = $imap->undeleteMessages($imap_uid);
	- if (is_object($result) && is_a($result, 'PEAR_Error')) {
	- $error = $result;
	- }
	- else {
	- // re-sync the cache
	- $this->storage->synchronize();
	- }
	- }
	- }
	-
	- if ($error) {
	- raise_error(array(
	- 'code' => 600, 'type' => 'php',
	- 'file' => __FILE__, 'line' => __LINE__,
	- 'message' => "Error undeleting an event object(s) from the Kolab server:" . $error->getMessage()),
	- true, false);
	-
	- return false;
	- }
	-
	- $rcmail = rcmail::get_instance();
	- $rcmail->session->remove('kolab_delete_uids');
	-
	- return true;
	+ // TODO: re-implement this with new kolab_storege backend
	+ return false;
	}

	/**
	* Simply fetch all records and store them in private member vars
	* We thereby rely on cahcing done by the Horde classes
	*/
	private function _fetch_events()
	{
	if (!isset($this->events)) {
	$this->events = array();

	foreach ((array)$this->storage->get_objects() as $record) {
	$event = $this->_to_rcube_event($record);
	$this->events[$event['id']] = $event;
	}
	}
	}


	/**
	* Create instances of a recurring event
	*/
	public function _get_recurring_events($event, $start, $end, $event_id = null)
	{
	// include library class
	require_once($this->cal->home . '/lib/calendar_recurrence.php');

	$recurrence = new calendar_recurrence($this->cal, $event);

	$events = array();
	$duration = $event['end'] - $event['start'];
	$i = 0;
	while ($rec_start = $recurrence->next_start()) {
	$rec_end = $rec_start + $duration;
	$rec_id = $event['id'] . '-' . ++$i;

	// add to output if in range
	if (($rec_start <= $end && $rec_end >= $start) \|\| ($event_id && $rec_id == $event_id)) {
	$rec_event = $event;
	$rec_event['id'] = $rec_id;
	$rec_event['recurrence_id'] = $event['id'];
	$rec_event['start'] = $rec_start;
	$rec_event['end'] = $rec_end;
	$rec_event['_instance'] = $i;
	$events[] = $rec_event;

	if ($rec_id == $event_id) {
	$this->events[$rec_id] = $rec_event;
	break;
	}
	}
	else if ($rec_start > $end) // stop loop if out of range
	break;
	}

	return $events;
	}

	/**
	* Convert from Kolab_Format to internal representation
	*/
	private function _to_rcube_event($record)
	{
	$record['id'] = $record['uid'];
	$record['calendar'] = $this->id;

	// convert from DateTime to unix timestamp
	if (is_a($record['start'], 'DateTime'))
	$record['start'] = $record['start']->format('U');
	if (is_a($record['end'], 'DateTime'))
	$record['end'] = $record['end']->format('U');

	// all-day events go from 12:00 - 13:00
	if ($record['end'] <= $record['start'] && $record['allday'])
	$record['end'] = $record['start'] + 3600;

	if (!empty($rec['_attachments'])) {
	foreach ($rec['_attachments'] as $name => $attachment) {
	// @TODO: 'type' and 'key' are the only supported (no 'size')
	$attachments[] = array(
	'id' => $attachment['key'],
	'mimetype' => $attachment['type'],
	'name' => $name,
	);
	}
	}

	$sensitivity_map = array_flip($this->sensitivity_map);
	$record['sensitivity'] = intval($sensitivity_map[$record['sensitivity']]);

	// Roundcube only supports one category assignment
	if (is_array($record['categories']))
	$record['categories'] = $record['categories'][0];

	// remove internals
	unset($record['_mailbox'], $record['_msguid'], $record['_formatobj'], $record['_attachments']);

	return $record;
	}

	/**
	* Convert the given event record into a data structure that can be passed to Kolab_Storage backend for saving
	* (opposite of self::_to_rcube_event())
	*/
	private function _from_rcube_event($event, $old = array())
	{
	$object = &$event;

	// in Horde attachments are indexed by name
	$object['_attachments'] = array();
	if (!empty($event['attachments'])) {
	$collisions = array();
	foreach ($event['attachments'] as $idx => $attachment) {
	// Roundcube ID has nothing to do with Horde ID, remove it
	if ($attachment['content'])
	unset($attachment['id']);

	// Horde code assumes that there will be no more than
	// one file with the same name: make filenames unique
	$filename = $attachment['name'];
	if ($collisions[$filename]++) {
	$ext = preg_match('/(\.[a-z0-9]{1,6})$/i', $filename, $m) ? $m[1] : null;
	$attachment['name'] = basename($filename, $ext) . '-' . $collisions[$filename] . $ext;
	}

	// set type parameter
	if ($attachment['mimetype'])
	$attachment['type'] = $attachment['mimetype'];

	$object['_attachments'][$attachment['name']] = $attachment;
	unset($event['attachments'][$idx]);
	}
	}

	// translate sensitivity property
	$event['sensitivity'] = $this->sensitivity_map[$event['sensitivity']];

	// set current user as ORGANIZER
	$identity = $this->cal->rc->user->get_identity();
	if (empty($event['attendees']) && $identity['email'])
	$event['attendees'] = array(array('role' => 'ORGANIZER', 'name' => $identity['name'], 'email' => $identity['email']));

	$event['_owner'] = $identity['email'];

	// copy meta data (starting with _) from old object
	foreach ((array)$old as $key => $val) {
	if (!isset($event[$key]) && $key[0] == '_')
	$event[$key] = $val;
	}

	return $event;
	}


	}
	diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
	index a29edccf..62f34b8c 100644
	--- a/plugins/calendar/drivers/kolab/kolab_driver.php
	+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
	@@ -1,1228 +1,1224 @@
	<?php

	/**
	* Kolab driver for the Calendar plugin
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2012, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	require_once(dirname(__FILE__) . '/kolab_calendar.php');

	class kolab_driver extends calendar_driver
	{
	// features this backend supports
	public $alarms = true;
	public $attendees = true;
	public $freebusy = true;
	public $attachments = true;
	public $undelete = true;
	public $alarm_types = array('DISPLAY','EMAIL');
	public $categoriesimmutable = true;

	private $rc;
	private $cal;
	private $calendars;
	private $has_writeable = false;

	/**
	* Default constructor
	*/
	public function __construct($cal)
	{
	$this->cal = $cal;
	$this->rc = $cal->rc;
	$this->_read_calendars();

	$this->cal->register_action('push-freebusy', array($this, 'push_freebusy'));
	$this->cal->register_action('calendar-acl', array($this, 'calendar_acl'));
	}


	/**
	* Read available calendars from server
	*/
	private function _read_calendars()
	{
	// already read sources
	if (isset($this->calendars))
	return $this->calendars;

	// get all folders that have "event" type
	$folders = kolab_storage::get_folders('event');
	$this->calendars = array();

	if (PEAR::isError($folders)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Failed to list calendar folders from Kolab server:" . $folders->getMessage()),
	true, false);
	}
	else {
	// convert to UTF8 and sort
	$names = array();
	foreach ($folders as $folder)
	$names[$folder->name] = rcube_charset::convert($folder->name, 'UTF7-IMAP');

	asort($names, SORT_LOCALE_STRING);

	foreach ($names as $utf7name => $name) {
	$calendar = new kolab_calendar($utf7name, $this->cal);
	$this->calendars[$calendar->id] = $calendar;
	if (!$calendar->readonly)
	$this->has_writeable = true;
	}
	}

	return $this->calendars;
	}


	/**
	* Get a list of available calendars from this source
	*/
	public function list_calendars()
	{
	// attempt to create a default calendar for this user
	if (!$this->has_writeable) {
	if ($this->create_calendar(array('name' => 'Calendar', 'color' => 'cc0000'))) {
	unset($this->calendars);
	$this->_read_calendars();
	}
	}

	$calendars = $names = array();

	foreach ($this->calendars as $id => $cal) {
	if ($cal->ready) {
	$name = $origname = $cal->get_name();

	// find folder prefix to truncate (the same code as in kolab_addressbook plugin)
	for ($i = count($names)-1; $i >= 0; $i--) {
	if (strpos($name, $names[$i].' » ') === 0) {
	$length = strlen($names[$i].' » ');
	$prefix = substr($name, 0, $length);
	$count = count(explode(' » ', $prefix));
	$name = str_repeat('  ', $count-1) . '» ' . substr($name, $length);
	break;
	}
	}

	$names[] = $origname;

	$calendars[$cal->id] = array(
	'id' => $cal->id,
	'name' => $name,
	'editname' => $cal->get_foldername(),
	'color' => $cal->get_color(),
	'readonly' => $cal->readonly,
	'showalarms' => $cal->alarms,
	'class_name' => $cal->get_namespace(),
	'active' => $cal->storage->is_subscribed(kolab_storage::SERVERSIDE_SUBSCRIPTION),
	);
	}
	}

	return $calendars;
	}


	/**
	* Create a new calendar assigned to the current user
	*
	* @param array Hash array with calendar properties
	* name: Calendar name
	* color: The color of the calendar
	* @return mixed ID of the calendar on success, False on error
	*/
	public function create_calendar($prop)
	{
	$folder = $this->folder_update($prop);

	if ($folder === false) {
	return false;
	}

	// subscribe to new calendar by default
	- $storage = $this->rc->get_storage();
	- $storage->subscribe($folder);
	+ $storage = kolab_storage::get_folder($folder);
	+ $storage->subscribe($prop['active'], kolab_storage::SERVERSIDE_SUBSCRIPTION);

	// create ID
	$id = kolab_storage::folder_id($folder);

	// save color in user prefs (temp. solution)
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());

	if (isset($prop['color']))
	$prefs['kolab_calendars'][$id]['color'] = $prop['color'];
	if (isset($prop['showalarms']))
	$prefs['kolab_calendars'][$id]['showalarms'] = $prop['showalarms'] ? true : false;

	if ($prefs['kolab_calendars'][$id])
	$this->rc->user->save_prefs($prefs);

	return $id;
	}


	/**
	* Update properties of an existing calendar
	*
	* @see calendar_driver::edit_calendar()
	*/
	public function edit_calendar($prop)
	{
	if ($prop['id'] && ($cal = $this->calendars[$prop['id']])) {
	$oldfolder = $cal->get_realname();
	$newfolder = $this->folder_update($prop);

	if ($newfolder === false) {
	return false;
	}

	// create ID
	$id = kolab_storage::folder_id($newfolder);

	// fallback to local prefs
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());
	unset($prefs['kolab_calendars'][$prop['id']]);

	if (isset($prop['color']))
	$prefs['kolab_calendars'][$id]['color'] = $prop['color'];
	if (isset($prop['showalarms']))
	$prefs['kolab_calendars'][$id]['showalarms'] = $prop['showalarms'] ? true : false;

	if ($prefs['kolab_calendars'][$id])
	$this->rc->user->save_prefs($prefs);

	return true;
	}

	return false;
	}


	/**
	* Set active/subscribed state of a calendar
	*
	* @see calendar_driver::subscribe_calendar()
	*/
	public function subscribe_calendar($prop)
	{
	if ($prop['id'] && ($cal = $this->calendars[$prop['id']])) {
	- $storage = $this->rc->get_storage();
	- if ($prop['active'])
	- return $storage->subscribe($cal->get_realname());
	- else
	- return $storage->unsubscribe($cal->get_realname());
	+ return $cal->storage->subscribe($prop['active'], kolab_storage::SERVERSIDE_SUBSCRIPTION);
	}
	-
	+
	return false;
	}


	/**
	* Rename or Create a new IMAP folder
	*
	* @param array Hash array with calendar properties
	*
	* @return mixed New folder name or False on failure
	*/
	private function folder_update(&$prop)
	{
	$folder = rcube_charset::convert($prop['name'], RCMAIL_CHARSET, 'UTF7-IMAP');
	$oldfolder = $prop['oldname']; // UTF7
	$parent = $prop['parent']; // UTF7
	$storage = $this->rc->get_storage();
	$delimiter = $storage->get_hierarchy_delimiter();

	if (strlen($oldfolder)) {
	$options = $storage->folder_info($oldfolder);
	}

	if (!empty($options) && ($options['norename'] \|\| $options['protected'])) {
	}
	// sanity checks (from steps/settings/save_folder.inc)
	else if (!strlen($folder)) {
	$this->last_error = 'Invalid folder name';
	return false;
	}
	else if (strlen($folder) > 128) {
	$this->last_error = 'Folder name too long';
	return false;
	}
	else {
	// these characters are problematic e.g. when used in LIST/LSUB
	foreach (array($delimiter, '%', '*') as $char) {
	if (strpos($folder, $delimiter) !== false) {
	$this->last_error = 'Invalid folder name';
	return false;
	}
	}
	}

	if (!empty($options) && ($options['protected'] \|\| $options['norename'])) {
	$folder = $oldfolder;
	}
	else if (strlen($parent)) {
	$folder = $parent . $delimiter . $folder;
	}
	else {
	// add namespace prefix (when needed)
	$folder = $storage->mod_folder($folder, 'in');
	}

	// Check access rights to the parent folder
	if (strlen($parent) && (!strlen($oldfolder) \|\| $oldfolder != $folder)) {
	$parent_opts = $storage->folder_info($parent);
	if ($parent_opts['namespace'] != 'personal'
	&& (empty($parent_opts['rights']) \|\| !preg_match('/[ck]/', implode($parent_opts)))
	) {
	$this->last_error = 'No permission to create folder';
	return false;
	}
	}

	// update the folder name
	if (strlen($oldfolder)) {
	if ($oldfolder != $folder) {
	if (!($result = kolab_storage::folder_rename($oldfolder, $folder)))
	$this->last_error = kolab_storage::$last_error;
	}
	else
	$result = true;
	}
	// create new folder
	else {
	if (!($result = kolab_storage::folder_create($folder, 'event', false)))
	$this->last_error = kolab_storage::$last_error;
	}

	// save color in METADATA
	// TODO: also save 'showalarams' and other properties here

	if ($result && $prop['color']) {
	if (!($meta_saved = $storage->set_metadata(array(kolab_calendar::COLOR_KEY_SHARED => $prop['color'])))) // try in shared namespace
	$meta_saved = $storage->set_metadata(array(kolab_calendar::COLOR_KEY_PRIVATE => $prop['color'])); // try in private namespace
	if ($meta_saved)
	unset($prop['color']); // unsetting will prevent fallback to local user prefs
	}

	return $result ? $folder : false;
	}


	/**
	* Delete the given calendar with all its contents
	*
	* @see calendar_driver::remove_calendar()
	*/
	public function remove_calendar($prop)
	{
	if ($prop['id'] && ($cal = $this->calendars[$prop['id']])) {
	$folder = $cal->get_realname();
	if (kolab_storage::folder_delete($folder)) {
	// remove color in user prefs (temp. solution)
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());
	unset($prefs['kolab_calendars'][$prop['id']]);

	$this->rc->user->save_prefs($prefs);
	return true;
	}
	else
	$this->last_error = kolab_storage::$last_error;
	}

	return false;
	}


	/**
	* Fetch a single event
	*
	* @see calendar_driver::get_event()
	* @return array Hash array with event properties, false if not found
	*/
	public function get_event($event, $writeable = null)
	{
	if (is_array($event)) {
	$id = $event['id'] ? $event['id'] : $event['uid'];
	$cal = $event['calendar'];
	}
	else {
	$id = $event;
	}

	if ($cal && ($storage = $this->calendars[$cal])) {
	return $storage->get_event($id);
	}
	// iterate over all calendar folders and search for the event ID
	else if (!$cal) {
	foreach ($this->calendars as $storage) {
	if ($writeable && $storage->readonly)
	continue;
	if ($result = $storage->get_event($id)) {
	return $result;
	}
	}
	}

	return false;
	}

	/**
	* Add a single event to the database
	*
	* @see calendar_driver::new_event()
	*/
	public function new_event($event)
	{
	$cid = $event['calendar'] ? $event['calendar'] : reset(array_keys($this->calendars));
	if ($storage = $this->calendars[$cid]) {
	// handle attachments to add
	if (!empty($event['attachments'])) {
	foreach ($event['attachments'] as $idx => $attachment) {
	// we'll read file contacts into memory, Horde/Kolab classes does the same
	// So we cannot save memory, rcube_imap class can do this better
	$event['attachments'][$idx]['content'] = $attachment['data'] ? $attachment['data'] : file_get_contents($attachment['path']);
	}
	}

	$GLOBALS['conf']['kolab']['no_triggering'] = true;
	$success = $storage->insert_event($event);

	if ($success)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	return false;
	}

	/**
	* Update an event entry with the given data
	*
	* @see calendar_driver::new_event()
	* @return boolean True on success, False on error
	*/
	public function edit_event($event)
	{
	return $this->update_event($event);
	}

	/**
	* Move a single event
	*
	* @see calendar_driver::move_event()
	* @return boolean True on success, False on error
	*/
	public function move_event($event)
	{
	if (($storage = $this->calendars[$event['calendar']]) && ($ev = $storage->get_event($event['id'])))
	return $this->update_event($event + $ev);

	return false;
	}

	/**
	* Resize a single event
	*
	* @see calendar_driver::resize_event()
	* @return boolean True on success, False on error
	*/
	public function resize_event($event)
	{
	if (($storage = $this->calendars[$event['calendar']]) && ($ev = $storage->get_event($event['id'])))
	return $this->update_event($event + $ev);

	return false;
	}

	/**
	* Remove a single event
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* @param boolean Remove record(s) irreversible (mark as deleted otherwise)
	*
	* @return boolean True on success, False on error
	*/
	public function remove_event($event, $force = true)
	{
	$success = false;
	$_savemode = $event['_savemode'];

	if (($storage = $this->calendars[$event['calendar']]) && ($event = $storage->get_event($event['id']))) {
	$event['_savemode'] = $_savemode;
	$savemode = 'all';
	$master = $event;

	$this->rc->session->remove('calendar_restore_event_data');
	$GLOBALS['conf']['kolab']['no_triggering'] = true;

	// read master if deleting a recurring event
	if ($event['recurrence'] \|\| $event['recurrence_id']) {
	$master = $event['recurrence_id'] ? $storage->get_event($event['recurrence_id']) : $event;
	$savemode = $event['_savemode'];
	}

	switch ($savemode) {
	case 'current':
	$_SESSION['calendar_restore_event_data'] = $master;

	// removing the first instance => just move to next occurence
	if ($master['id'] == $event['id']) {
	$recurring = reset($storage->_get_recurring_events($event, $event['start'], $event['end'] + 86400 * 370, $event['id'].'-1'));
	$master['start'] = $recurring['start'];
	$master['end'] = $recurring['end'];
	if ($master['recurrence']['COUNT'])
	$master['recurrence']['COUNT']--;
	}
	else { // add exception to master event
	$master['recurrence']['EXDATE'][] = $event['start'];
	}
	$success = $storage->update_event($master);
	break;

	case 'future':
	if ($master['id'] != $event['id']) {
	$_SESSION['calendar_restore_event_data'] = $master;

	// set until-date on master event
	$master['recurrence']['UNTIL'] = $event['start'] - 86400;
	unset($master['recurrence']['COUNT']);
	$success = $storage->update_event($master);
	break;
	}

	default: // 'all' is default
	$success = $storage->delete_event($master, $force);
	break;
	}
	}

	if ($success)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	/**
	* Restore a single deleted event
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* @return boolean True on success, False on error
	*/
	public function restore_event($event)
	{
	if ($storage = $this->calendars[$event['calendar']]) {
	if (!empty($_SESSION['calendar_restore_event_data']))
	$success = $storage->update_event($_SESSION['calendar_restore_event_data']);
	else
	$success = $storage->restore_event($event);

	if ($success)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	return false;
	}

	/**
	* Wrapper to update an event object depending on the given savemode
	*/
	private function update_event($event)
	{
	if (!($storage = $this->calendars[$event['calendar']]))
	return false;

	// move event to another folder/calendar
	if ($event['_fromcalendar'] && $event['_fromcalendar'] != $event['calendar']) {
	if (!($fromcalendar = $this->calendars[$event['_fromcalendar']]))
	return false;

	if ($event['_savemode'] != 'new') {
	if (!$fromcalendar->storage->move($event['id'], $storage->get_realname()))
	return false;

	$fromcalendar = $storage;
	}
	}
	else
	$fromcalendar = $storage;

	$success = false;
	$savemode = 'all';
	$attachments = array();
	$old = $master = $fromcalendar->get_event($event['id']);

	// delete existing attachment(s)
	if (!empty($event['deleted_attachments'])) {
	foreach ($event['deleted_attachments'] as $attachment) {
	if (!empty($old['attachments'])) {
	foreach ($old['attachments'] as $idx => $att) {
	if ($att['id'] == $attachment) {
	unset($old['attachments'][$idx]);
	}
	}
	}
	}
	}

	// handle attachments to add
	if (!empty($event['attachments'])) {
	foreach ($event['attachments'] as $attachment) {
	// skip entries without content (could be existing ones)
	if (!$attachment['data'] && !$attachment['path'])
	continue;
	// we'll read file contacts into memory, Horde/Kolab classes does the same
	// So we cannot save memory, rcube_imap class can do this better
	$attachments[] = array(
	'name' => $attachment['name'],
	'type' => $attachment['mimetype'],
	'content' => $attachment['data'] ? $attachment['data'] : file_get_contents($attachment['path']),
	);
	}
	}

	$event['attachments'] = array_merge((array)$old['attachments'], $attachments);

	// modify a recurring event, check submitted savemode to do the right things
	if ($old['recurrence'] \|\| $old['recurrence_id']) {
	$master = $old['recurrence_id'] ? $fromcalendar->get_event($old['recurrence_id']) : $old;
	$savemode = $event['_savemode'];
	}

	// keep saved exceptions (not submitted by the client)
	if ($old['recurrence']['EXDATE'])
	$event['recurrence']['EXDATE'] = $old['recurrence']['EXDATE'];

	$GLOBALS['conf']['kolab']['no_triggering'] = true;

	switch ($savemode) {
	case 'new':
	// save submitted data as new (non-recurring) event
	$event['recurrence'] = array();
	$event['uid'] = $this->cal->generate_uid();

	// copy attachment data to new event
	foreach ((array)$event['attachments'] as $idx => $attachment) {
	if (!$attachment['data'])
	$attachment['data'] = $fromcalendar->get_attachment_body($attachment['id']);
	}

	$success = $storage->insert_event($event);
	break;

	case 'current':
	// add exception to master event
	$master['recurrence']['EXDATE'][] = $old['start'];
	$storage->update_event($master);

	// insert new event for this occurence
	$event += $old;
	$event['recurrence'] = array();
	$event['uid'] = $this->cal->generate_uid();
	$success = $storage->insert_event($event);
	break;

	case 'future':
	if ($master['id'] != $event['id']) {
	// set until-date on master event
	$master['recurrence']['UNTIL'] = $old['start'] - 86400;
	unset($master['recurrence']['COUNT']);
	$storage->update_event($master);

	// save this instance as new recurring event
	$event += $old;
	$event['uid'] = $this->cal->generate_uid();

	// if recurrence COUNT, update value to the correct number of future occurences
	if ($event['recurrence']['COUNT']) {
	$event['recurrence']['COUNT'] -= $old['_instance'];
	}

	// remove fixed weekday, will be re-set to the new weekday in kolab_calendar::insert_event()
	if (strlen($event['recurrence']['BYDAY']) == 2)
	unset($event['recurrence']['BYDAY']);
	if ($master['recurrence']['BYMONTH'] == gmdate('n', $master['start']))
	unset($event['recurrence']['BYMONTH']);

	$success = $storage->insert_event($event);
	break;
	}

	default: // 'all' is default
	$event['id'] = $master['id'];
	$event['uid'] = $master['uid'];

	// use start date from master but try to be smart on time or duration changes
	$old_start_date = date('Y-m-d', $old['start']);
	$old_start_time = date('H:i', $old['start']);
	$old_duration = $old['end'] - $old['start'];

	$new_start_date = date('Y-m-d', $event['start']);
	$new_start_time = date('H:i', $event['start']);
	$new_duration = $event['end'] - $event['start'];

	$diff = $old_start_date != $new_start_date \|\| $old_start_time != $new_start_time \|\| $old_duration != $new_duration;

	// shifted or resized
	if ($diff && ($old_start_date == $new_start_date \|\| $old_duration == $new_duration)) {
	$event['start'] = $master['start'] + ($event['start'] - $old['start']);
	$event['end'] = $event['start'] + $new_duration;

	// remove fixed weekday, will be re-set to the new weekday in kolab_calendar::update_event()
	if ($old_start_date != $new_start_date) {
	if (strlen($event['recurrence']['BYDAY']) == 2)
	unset($event['recurrence']['BYDAY']);
	if ($old['recurrence']['BYMONTH'] == gmdate('n', $old['start']))
	unset($event['recurrence']['BYMONTH']);
	}
	}

	$success = $storage->update_event($event);
	break;
	}

	if ($success)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	/**
	* Get events from source.
	*
	* @param integer Event's new start (unix timestamp)
	* @param integer Event's new end (unix timestamp)
	* @param string Search query (optional)
	* @param mixed List of calendar IDs to load events from (either as array or comma-separated string)
	* @param boolean Strip virtual events (optional)
	* @return array A list of event records
	*/
	public function load_events($start, $end, $search = null, $calendars = null, $virtual = 1)
	{
	if ($calendars && is_string($calendars))
	$calendars = explode(',', $calendars);

	$events = $categories = array();
	foreach ($this->calendars as $cid => $calendar) {
	if ($calendars && !in_array($cid, $calendars))
	continue;

	$events = array_merge($events, $this->calendars[$cid]->list_events($start, $end, $search, $virtual));
	$categories += $this->calendars[$cid]->categories;
	}

	// add new categories to user prefs
	$old_categories = $this->rc->config->get('calendar_categories', array());
	if ($newcats = array_diff(array_map('strtolower', array_keys($categories)), array_map('strtolower', array_keys($old_categories)))) {
	foreach ($newcats as $category)
	$old_categories[$category] = ''; // no color set yet
	$this->rc->user->save_prefs(array('calendar_categories' => $old_categories));
	}

	return $events;
	}

	/**
	* Get a list of pending alarms to be displayed to the user
	*
	* @see calendar_driver::pending_alarms()
	*/
	public function pending_alarms($time, $calendars = null)
	{
	$interval = 300;
	$time -= $time % 60;

	$slot = $time;
	$slot -= $slot % $interval;

	$last = $time - max(60, $this->rc->session->get_keep_alive());
	$last -= $last % $interval;

	// only check for alerts once in 5 minutes
	if ($last == $slot)
	return false;

	if ($calendars && is_string($calendars))
	$calendars = explode(',', $calendars);

	$time = $slot + $interval;

	$events = array();
	foreach ($this->calendars as $cid => $calendar) {
	// skip calendars with alarms disabled
	if (!$calendar->alarms \|\| ($calendars && !in_array($cid, $calendars)))
	continue;

	foreach ($calendar->list_events($time, $time + 86400 * 365) as $e) {
	// add to list if alarm is set
	if ($e['_alarm'] && ($notifyat = $e['start'] - $e['_alarm'] * 60) <= $time) {
	$id = $e['id'];
	$events[$id] = $e;
	$events[$id]['notifyat'] = $notifyat;
	}
	}
	}

	// get alarm information stored in local database
	if (!empty($events)) {
	$event_ids = array_map(array($this->rc->db, 'quote'), array_keys($events));
	$result = $this->rc->db->query(sprintf(
	"SELECT * FROM kolab_alarms
	WHERE event_id IN (%s)",
	join(',', $event_ids),
	$this->rc->db->now()
	));

	while ($result && ($e = $this->rc->db->fetch_assoc($result))) {
	$dbdata[$e['event_id']] = $e;
	}
	}

	$alarms = array();
	foreach ($events as $id => $e) {
	// skip dismissed
	if ($dbdata[$id]['dismissed'])
	continue;

	// snooze function may have shifted alarm time
	$notifyat = $dbdata[$id]['notifyat'] ? strtotime($dbdata[$id]['notifyat']) : $e['notifyat'];
	if ($notifyat <= $time)
	$alarms[] = $e;
	}

	return $alarms;
	}

	/**
	* Feedback after showing/sending an alarm notification
	*
	* @see calendar_driver::dismiss_alarm()
	*/
	public function dismiss_alarm($event_id, $snooze = 0)
	{
	// set new notifyat time or unset if not snoozed
	$notifyat = $snooze > 0 ? date('Y-m-d H:i:s', time() + $snooze) : null;

	$query = $this->rc->db->query(
	"REPLACE INTO kolab_alarms
	(event_id, dismissed, notifyat)
	VALUES(?, ?, ?)",
	$event_id,
	$snooze > 0 ? 0 : 1,
	$notifyat
	);

	return $this->rc->db->affected_rows($query);
	}

	/**
	* List attachments from the given event
	*/
	public function list_attachments($event)
	{
	if (!($storage = $this->calendars[$event['calendar']]))
	return false;

	$event = $storage->get_event($event['id']);

	return $event['attachments'];
	}

	/**
	* Get attachment properties
	*/
	public function get_attachment($id, $event)
	{
	if (!($storage = $this->calendars[$event['calendar']]))
	return false;

	$event = $storage->get_event($event['id']);

	if ($event && !empty($event['attachments'])) {
	foreach ($event['attachments'] as $att) {
	if ($att['id'] == $id) {
	return $att;
	}
	}
	}

	return null;
	}

	/**
	* Get attachment body
	*/
	public function get_attachment_body($id, $event)
	{
	if (!($storage = $this->calendars[$event['calendar']]))
	return false;

	return $storage->get_attachment_body($id);
	}

	/**
	* List availabale categories
	* The default implementation reads them from config/user prefs
	*/
	public function list_categories()
	{
	// FIXME: complete list with categories saved in config objects (KEP:12)
	return $this->rc->config->get('calendar_categories', array());
	}

	/**
	* Fetch free/busy information from a person within the given range
	*/
	public function get_freebusy_list($email, $start, $end)
	{
	require_once('Horde/iCalendar.php');

	if (empty($email)/* \|\| $end < time()*/)
	return false;

	// map vcalendar fbtypes to internal values
	$fbtypemap = array(
	'FREE' => calendar::FREEBUSY_FREE,
	'BUSY-TENTATIVE' => calendar::FREEBUSY_TENTATIVE,
	'X-OUT-OF-OFFICE' => calendar::FREEBUSY_OOF,
	'OOF' => calendar::FREEBUSY_OOF);

	// ask kolab server first
	$fbdata = @file_get_contents(kolab_storage::get_freebusy_url($email));

	// get free-busy url from contacts
	if (!$fbdata) {
	$fburl = null;
	foreach ((array)$this->rc->config->get('autocomplete_addressbooks', 'sql') as $book) {
	$abook = $this->rc->get_address_book($book);

	if ($result = $abook->search(array('email'), $email, true, true, true/, 'freebusyurl'/)) {
	while ($contact = $result->iterate()) {
	if ($fburl = $contact['freebusyurl']) {
	$fbdata = @file_get_contents($fburl);
	break;
	}
	}
	}

	if ($fbdata)
	break;
	}
	}

	// parse free-busy information using Horde classes
	if ($fbdata) {
	$fbcal = new Horde_iCalendar;
	$fbcal->parsevCalendar($fbdata);
	if ($fb = $fbcal->findComponent('vfreebusy')) {
	$result = array();
	$params = $fb->getExtraParams();
	foreach ($fb->getBusyPeriods() as $from => $to) {
	if ($to == null) // no information, assume free
	break;
	$type = $params[$from]['FBTYPE'];
	$result[] = array($from, $to, isset($fbtypemap[$type]) ? $fbtypemap[$type] : calendar::FREEBUSY_BUSY);
	}

	// set period from $start till the begin of the free-busy information as 'unknown'
	if (($fbstart = $fb->getStart()) && $start < $fbstart) {
	array_unshift($result, array($start, $fbstart, calendar::FREEBUSY_UNKNOWN));
	}
	// pad period till $end with status 'unknown'
	if (($fbend = $fb->getEnd()) && $fbend < $end) {
	$result[] = array($fbend, $end, calendar::FREEBUSY_UNKNOWN);
	}
	return $result;
	}
	}

	return false;
	}

	/**
	* Handler to push folder triggers when sent from client.
	* Used to push free-busy changes asynchronously after updating an event
	*/
	public function push_freebusy()
	{
	// make shure triggering completes
	set_time_limit(0);
	ignore_user_abort(true);

	$cal = get_input_value('source', RCUBE_INPUT_GPC);
	if (!($cal = $this->calendars[$cal]))
	return false;

	// trigger updates on folder
	$trigger = $cal->storage->trigger();
	if (is_object($trigger) && is_a($trigger, 'PEAR_Error')) {
	raise_error(array(
	'code' => 900, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Failed triggering folder. Error was " . $trigger->getMessage()),
	true, false);
	}

	exit;
	}

	/**
	* Callback function to produce driver-specific calendar create/edit form
	*
	* @param string Request action 'form-edit\|form-new'
	* @param array Calendar properties (e.g. id, color)
	* @param array Edit form fields
	*
	* @return string HTML content of the form
	*/
	public function calendar_form($action, $calendar, $formfields)
	{
	if ($calendar['id'] && ($cal = $this->calendars[$calendar['id']])) {
	$folder = $cal->get_realname(); // UTF7
	$color = $cal->get_color();
	}
	else {
	$folder = '';
	$color = '';
	}

	$hidden_fields[] = array('name' => 'oldname', 'value' => $folder);

	$storage = $this->rc->get_storage();
	$delim = $storage->get_hierarchy_delimiter();
	$form = array();

	if (strlen($folder)) {
	$path_imap = explode($delim, $folder);
	array_pop($path_imap); // pop off name part
	$path_imap = implode($path_imap, $delim);

	$options = $storage->folder_info($folder);
	}
	else {
	$path_imap = '';
	}

	// General tab
	$form['props'] = array(
	'name' => $this->rc->gettext('properties'),
	);

	// Disable folder name input
	if (!empty($options) && ($options['norename'] \|\| $options['protected'])) {
	$input_name = new html_hiddenfield(array('name' => 'name', 'id' => 'calendar-name'));
	$formfields['name']['value'] = Q(str_replace($delimiter, ' » ', kolab_storage::object_name($folder)))
	. $input_name->show($folder);
	}

	// calendar name (default field)
	$form['props']['fieldsets']['location'] = array(
	'name' => $this->rc->gettext('location'),
	'content' => array(
	'name' => $formfields['name']
	),
	);

	if (!empty($options) && ($options['norename'] \|\| $options['protected'])) {
	// prevent user from moving folder
	$hidden_fields[] = array('name' => 'parent', 'value' => $path_imap);
	}
	else {
	$select = kolab_storage::folder_selector('event', array('name' => 'parent'), $folder);
	$form['props']['fieldsets']['location']['content']['path'] = array(
	'label' => $this->cal->gettext('parentcalendar'),
	'value' => $select->show(strlen($folder) ? $path_imap : ''),
	);
	}

	// calendar color (default field)
	$form['props']['fieldsets']['settings'] = array(
	'name' => $this->rc->gettext('settings'),
	'content' => array(
	'color' => $formfields['color'],
	'showalarms' => $formfields['showalarms'],
	),
	);


	if ($action != 'form-new') {
	$form['sharing'] = array(
	'name' => Q($this->cal->gettext('tabsharing')),
	'content' => html::tag('iframe', array(
	'src' => $this->cal->rc->url(array('_action' => 'calendar-acl', 'id' => $calendar['id'], 'framed' => 1)),
	'width' => '100%',
	'height' => 350,
	'border' => 0,
	'style' => 'border:0'),
	''),
	);
	}

	$this->form_html = '';
	if (is_array($hidden_fields)) {
	foreach ($hidden_fields as $field) {
	$hiddenfield = new html_hiddenfield($field);
	$this->form_html .= $hiddenfield->show() . "\n";
	}
	}

	// Create form output
	foreach ($form as $tab) {
	if (!empty($tab['fieldsets']) && is_array($tab['fieldsets'])) {
	$content = '';
	foreach ($tab['fieldsets'] as $fieldset) {
	$subcontent = $this->get_form_part($fieldset);
	if ($subcontent) {
	$content .= html::tag('fieldset', null, html::tag('legend', null, Q($fieldset['name'])) . $subcontent) ."\n";
	}
	}
	}
	else {
	$content = $this->get_form_part($tab);
	}

	if ($content) {
	$this->form_html .= html::tag('fieldset', null, html::tag('legend', null, Q($tab['name'])) . $content) ."\n";
	}
	}

	// Parse form template for skin-dependent stuff
	$this->rc->output->add_handler('calendarform', array($this, 'calendar_form_html'));
	return $this->rc->output->parse('calendar.kolabform', false, false);
	}

	/**
	* Handler for template object
	*/
	public function calendar_form_html()
	{
	return $this->form_html;
	}

	/**
	* Helper function used in calendar_form_content(). Creates a part of the form.
	*/
	private function get_form_part($form)
	{
	$content = '';

	if (is_array($form['content']) && !empty($form['content'])) {
	$table = new html_table(array('cols' => 2));
	foreach ($form['content'] as $col => $colprop) {
	$colprop['id'] = '_'.$col;
	$label = !empty($colprop['label']) ? $colprop['label'] : rcube_label($col);

	$table->add('title', sprintf('<label for="%s">%s</label>', $colprop['id'], Q($label)));
	$table->add(null, $colprop['value']);
	}
	$content = $table->show();
	}
	else {
	$content = $form['content'];
	}

	return $content;
	}


	/**
	* Handler to render ACL form for a calendar folder
	*/
	public function calendar_acl()
	{
	$this->rc->output->add_handler('folderacl', array($this, 'calendar_acl_form'));
	$this->rc->output->send('calendar.kolabacl');
	}

	/**
	* Handler for ACL form template object
	*/
	public function calendar_acl_form()
	{
	$calid = get_input_value('_id', RCUBE_INPUT_GPC);
	if ($calid && ($cal = $this->calendars[$calid])) {
	$folder = $cal->get_realname(); // UTF7
	$color = $cal->get_color();
	}
	else {
	$folder = '';
	$color = '';
	}

	$hidden_fields[] = array('name' => 'oldname', 'value' => $folder);

	$storage = $this->rc->get_storage();
	$delim = $storage->get_hierarchy_delimiter();
	$form = array();

	if (strlen($folder)) {
	$path_imap = explode($delim, $folder);
	array_pop($path_imap); // pop off name part
	$path_imap = implode($path_imap, $delim);

	$options = $storage->folder_info($folder);

	// Allow plugins to modify the form content (e.g. with ACL form)
	$plugin = $this->rc->plugins->exec_hook('calendar_form_kolab',
	array('form' => $form, 'options' => $options, 'name' => $folder));
	}

	if (!$plugin['form']['sharing']['content'])
	$plugin['form']['sharing']['content'] = html::div('hint', $this->cal->gettext('aclnorights'));

	return $plugin['form']['sharing']['content'];
	}


	/**
	* Return a (limited) list of color values to be used for calendar and category coloring
	*
	* @return mixed List for colors as hex values or false if no presets should be shown
	*/
	public function get_color_values()
	{
	// selection from http://msdn.microsoft.com/en-us/library/aa358802%28v=VS.85%29.aspx
	return array('000000','006400','2F4F4F','800000','808000','008000',
	'008080','000080','800080','4B0082','191970','8B0000','008B8B',
	'00008B','8B008B','556B2F','8B4513','228B22','6B8E23','2E8B57',
	'B8860B','483D8B','A0522D','0000CD','A52A2A','00CED1','696969',
	'20B2AA','9400D3','B22222','C71585','3CB371','D2691E','DC143C',
	'DAA520','00FA9A','4682B4','7CFC00','9932CC','FF0000','FF4500',
	'FF8C00','FFA500','FFD700','FFFF00','9ACD32','32CD32','00FF00',
	'00FF7F','00FFFF','5F9EA0','00BFFF','0000FF','FF00FF','808080',
	'708090','CD853F','8A2BE2','778899','FF1493','48D1CC','1E90FF',
	'40E0D0','4169E1','6A5ACD','BDB76B','BA55D3','CD5C5C','ADFF2F',
	'66CDAA','FF6347','8FBC8B','DA70D6','BC8F8F','9370DB','DB7093',
	'FF7F50','6495ED','A9A9A9','F4A460','7B68EE','D2B48C','E9967A',
	'DEB887','FF69B4','FA8072','F08080','EE82EE','87CEEB','FFA07A',
	'F0E68C','DDA0DD','90EE90','7FFFD4','C0C0C0','87CEFA','B0C4DE',
	'98FB98','ADD8E6','B0E0E6','D8BFD8','EEE8AA','AFEEEE','D3D3D3',
	'FFDEAD');
	}

	}
	diff --git a/plugins/calendar/package.xml b/plugins/calendar/package.xml
	index ed42622a..742e6e74 100644
	--- a/plugins/calendar/package.xml
	+++ b/plugins/calendar/package.xml
	@@ -1,189 +1,190 @@
	<?xml version="1.0" encoding="UTF-8"?>
	<package xmlns="http://pear.php.net/dtd/package-2.0" xmlns:tasks="http://pear.php.net/dtd/tasks-1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" packagerversion="1.9.0" version="2.0" xsi:schemaLocation="http://pear.php.net/dtd/tasks-1.0
	http://pear.php.net/dtd/tasks-1.0.xsd
	http://pear.php.net/dtd/package-2.0
	http://pear.php.net/dtd/package-2.0.xsd">
	<name>calendar</name>
	<uri>http://git.kolab.org/roundcube-plugins-kolab/</uri>
	<summary>Calendar plugin</summary>
	<description>-</description>
	<lead>
	<name>Thomas Bruederli</name>
	<user>bruederli</user>
	<email>bruederli@kolabsys.com</email>
	<active>yes</active>
	</lead>
	<developer>
	<name>Alensader Machniak</name>
	<user>machniak</user>
	<email>machniak@kolabsys.com</email>
	<active>yes</active>
	</developer>
	<date>2011-11-01</date>
	<version>
	<release>0.8</release>
	<api>0.8</api>
	</version>
	<stability>
	<release>stable</release>
	<api>stable</api>
	</stability>
	<license uri="http://www.gnu.org/licenses/agpl.html">GNU AGPLv3</license>
	<notes>-</notes>
	<contents>
	<dir baseinstalldir="/" name="/">
	<file name="calendar.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="calendar_base.js" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="calendar_ui.js" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="print.js" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/calendar_ical.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/calendar_itip.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/calendar_recurrence.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/calendar_ui.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/Horde_Date_Recurrence.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/fullcalendar-rc.patch" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/js/fullcalendar.js" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="lib/jquery.miniColors.min.js" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/calendar_driver.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/kolab/kolab_calendar.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/kolab/kolab_driver.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/database/database_driver.php" role="php">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/database/SQL/mysql.sql" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/database/SQL/postgresql.sql" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/database/SQL/sqlite.sql" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>
	<file name="drivers/kolab/SQL/mysql.sql" role="data">
	<tasks:replace from="@name@" to="name" type="package-info"/>
	<tasks:replace from="@package_version@" to="version" type="package-info"/>
	</file>


	<file name="skins/default/calendar.css" role="data"></file>
	<file name="skins/default/fullcalendar.css" role="data"></file>
	<file name="skins/default/fullcalendar.print.css" role="data"></file>
	<file name="skins/default/iehacks.css" role="data"></file>
	<file name="skins/default/jquery.miniColors.css" role="data"></file>
	<file name="skins/default/print.css" role="data"></file>
	<file name="skins/default/print.iehacks.css" role="data"></file>
	<file name="skins/default/images/attendee-status.gif" role="data"></file>
	<file name="skins/default/images/badge_confidential.gif" role="data"></file>
	<file name="skins/default/images/badge_confidential.png" role="data"></file>
	<file name="skins/default/images/badge_private.gif" role="data"></file>
	<file name="skins/default/images/badge_private.png" role="data"></file>
	<file name="skins/default/images/calendar-blue.png" role="data"></file>
	<file name="skins/default/images/calendar.gif" role="data"></file>
	<file name="skins/default/images/calendar.png" role="data"></file>
	<file name="skins/default/images/calendars.gif" role="data"></file>
	<file name="skins/default/images/calendars.png" role="data"></file>
	<file name="skins/default/images/eventicons.gif" role="data"></file>
	<file name="skins/default/images/export.png" role="data"></file>
	<file name="skins/default/images/freebusy-colors.gif" role="data"></file>
	<file name="skins/default/images/freebusy-colors.png" role="data"></file>
	<file name="skins/default/images/invitation.png" role="data"></file>
	<file name="skins/default/images/listheader.gif" role="data"></file>
	<file name="skins/default/images/loading_blue.gif" role="data"></file>
	<file name="skins/default/images/minicolors-all.png" role="data"></file>
	<file name="skins/default/images/minicolors-handles.gif" role="data"></file>
	<file name="skins/default/images/preview.png" role="data"></file>
	<file name="skins/default/images/print.png" role="data"></file>
	<file name="skins/default/images/spacer.gif" role="data"></file>
	<file name="skins/default/images/toggle.gif" role="data"></file>
	<file name="skins/default/images/toolbar.gif" role="data"></file>
	<file name="skins/default/images/toolbar.png" role="data"></file>
	<file name="skins/default/templates/attachment.html" role="data"></file>
	<file name="skins/default/templates/calendar.html" role="data"></file>
	<file name="skins/default/templates/eventedit.html" role="data"></file>
	<file name="skins/default/templates/freebusylegend.html" role="data"></file>
	<file name="skins/default/templates/itipattend.html" role="data"></file>
	<file name="skins/default/templates/kolabacl.html" role="data"></file>
	<file name="skins/default/templates/kolabform.html" role="data"></file>
	<file name="skins/default/templates/print.html" role="data"></file>

	<file name="config.inc.php.dist" role="data"></file>
	<file name="LICENSE" role="data"></file>
	+ <file name="README" role="data"></file>
	<file name="TODO" role="data"></file>

	<file name="localization/bg_BG.inc" role="data"></file>
	<file name="localization/cs_CZ.inc" role="data"></file>
	<file name="localization/de_CH.inc" role="data"></file>
	<file name="localization/de_DE.inc" role="data"></file>
	<file name="localization/en_US.inc" role="data"></file>
	<file name="localization/es_ES.inc" role="data"></file>
	<file name="localization/fr_FR.inc" role="data"></file>
	<file name="localization/hu_HU.inc" role="data"></file>
	<file name="localization/it_IT.inc" role="data"></file>
	<file name="localization/nl_NL.inc" role="data"></file>
	<file name="localization/pl_PL.inc" role="data"></file>
	<file name="localization/pt_BR.inc" role="data"></file>
	<file name="localization/ru_RU.inc" role="data"></file>
	</dir>
	<!-- / -->
	</contents>
	<dependencies>
	<required>
	<php>
	<min>5.2.1</min>
	</php>
	<pearinstaller>
	<min>1.7.0</min>
	</pearinstaller>
	</required>
	</dependencies>
	<phprelease/>
	</package>

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