calendar.js
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calendar.js
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	/*
	+-------------------------------------------------------------------------+
	\| Javascript for the Calendar Plugin \|
	\| Version 0.3 beta \|
	\| \|
	\| This program is free software; you can redistribute it and/or modify \|
	\| it under the terms of the GNU General Public License version 2 \|
	\| as published by the Free Software Foundation. \|
	\| \|
	\| 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 General Public License for more details. \|
	\| \|
	\| You should have received a copy of the GNU General Public License along \|
	\| with this program; if not, write to the Free Software Foundation, Inc., \|
	\| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. \|
	\| \|
	+-------------------------------------------------------------------------+
	\| Author: Lazlo Westerhof <hello@lazlo.me> \|
	\| Thomas Bruederli <roundcube@gmail.com> \|
	+-------------------------------------------------------------------------+
	*/

	// Roundcube calendar client class
	function rcube_calendar(settings)
	{
	/* member vars */
	this.settings = settings;
	this.alarm_ids = [];
	this.alarm_dialog = null;
	this.snooze_popup = null;
	this.dismiss_link = null;
	this.selected_event = null;
	this.selected_calendar = null;
	this.search_request = null;
	this.search_source = null;
	this.eventcount = [];


	/* private vars */
	var me = this;
	var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone \|\| 0);
	var day_clicked = day_clicked_ts = 0;
	var ignore_click = false;

	// 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 */

	// quote html entities
	var Q = function(str)
	{
	return String(str).replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"');
	};
	// php equivalent
	var nl2br = function(str)
	{
	return String(str).replace(/\n/g, "<br/>");
	};

	// 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 = $.datepicker.parseDate(datepicker_settings.dateFormat, date, datepicker_settings);
	var time_arr = time.split(/[:.]/);
	if (!isNaN(time_arr[0])) date.setHours(time_arr[0]);
	if (!isNaN(time_arr[1])) date.setMinutes(time_arr[1]);
	return date;
	};

	// convert the given Date object into a unix timestamp respecting browser's and user's timezone settings
	var date2unixtime = function(date) {
	return date.getTime()/1000 + gmt_offset;
	};

	var fromunixtime = function(ts) {
	ts -= gmt_offset;
	return new Date(ts * 1000);
	}

	// 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;
	};

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

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

	if (event.location)
	$('#event-location').html('@ ' + Q(event.location)).show();
	if (event.description)
	$('#event-description').show().children('.event-text').html(nl2br(Q(event.description))); // TODO: format HTML with clickable links and stuff

	// render from-to in a nice human-readable way
	$('#event-date').html(Q(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 '+event.className);
	if (event.free_busy)
	$('#event-free-busy').show().children('.event-text').html(Q(rcmail.gettext(event.free_busy, 'calendar')));
	if (event.priority != 1) {
	var priolabels = { 0:rcmail.gettext('low'), 1:rcmail.gettext('normal'), 2:rcmail.gettext('high') };
	$('#event-priority').show().children('.event-text').html(Q(priolabels[event.priority]));
	}
	if (event.sensitivity != 0) {
	var sensitivitylabels = { 0:rcmail.gettext('public'), 1:rcmail.gettext('private'), 2:rcmail.gettext('confidential') };
	$('#event-sensitivity').show().children('.event-text').html(Q(sensitivitylabels[event.sensitivity]));
	}

	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: true,
	title: null,
	close: function() {
	$dialog.dialog('destroy').hide();
	},
	buttons: buttons,
	minWidth: 320,
	width: 420
	}).show();
	/*
	// 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 = $("#eventedit");
	var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:action=='new' };
	me.selected_event = event;

	// reset dialog first, enable/disable fields according to editable state
	$('#eventtabs').get(0).reset();
	$('#calendar-select')[(action == 'new' ? 'show' : 'hide')]();

	// event details
	var title = $('#edit-title').val(event.title);
	var location = $('#edit-location').val(event.location);
	var description = $('#edit-description').val(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);

	if (event.allDay) {
	starttime.val("00:00").hide();
	endtime.val("23:59").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')]();

	// set recurrence form
	var recurrence = $('#edit-recurrence-frequency').val(event.recurrence ? event.recurrence.FREQ : '').change();
	var interval = $('select.edit-recurrence-interval').val(event.recurrence ? event.recurrence.INTERVAL : 1);
	var rrtimes = $('#edit-recurrence-repeat-times').val(event.recurrence ? event.recurrence.COUNT : 1);
	var 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();

	// buttons
	var buttons = {};

	buttons[rcmail.gettext('save', 'calendar')] = function() {
	var start = parse_datetime(starttime.val(), startdate.val());
	var end = parse_datetime(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: ''
	};

	// 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;
	}

	// 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;
	}
	}

	if (event.id) {
	data.id = event.id;
	if (event.recurrence)
	data.savemode = $('input.edit-recurring-savemode:checked').val();
	}
	else
	data.calendar = calendars.val();

	rcmail.http_post('event', { action:action, e: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);

	// open jquery UI dialog
	$dialog.dialog({
	modal: true,
	resizable: true,
	title: rcmail.gettext((action == 'edit' ? 'edit_event' : 'new_event'), 'calendar'),
	close: function() {
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	minWidth: 440,
	width: 480
	}).show();

	title.select();
	};

	// 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 a recurring event where the user needs to select the savemode
	var recurring_edit_confirm = function(event, action) {
	var $dialog = $('<div>').addClass('edit-recurring-warning');
	$dialog.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>');

	$dialog.find('a.button').button().click(function(e){
	event.savemode = String(this.href).replace(/.+#/, '');
	rcmail.http_post('event', { action:action, e:event });
	$dialog.dialog("destroy").hide();
	return false;
	});

	$dialog.dialog({
	modal: true,
	width: 420,
	dialogClass: 'warning',
	title: rcmail.gettext((action == 'remove' ? 'removerecurringevent' : 'changerecurringevent'), 'calendar'),
	buttons: [
	{
	text: rcmail.gettext('cancel', 'calendar'),
	click: function() {
	$(this).dialog("close");
	}
	}
	],
	close: function(){
	$dialog.dialog("destroy").hide();
	fc.fullCalendar('refetchEvents');
	}
	}).show();

	return true;
	};


	/* public methods */

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

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

	// send remove request to plugin
	if (confirm(rcmail.gettext('deleteventconfirm', 'calendar'))) {
	rcmail.http_post('event', { action:'remove', e:{ id:event.id, calendar:event.calendar } });
	return true;
	}

	return false;
	};

	// display a notification for the given pending alarms
	this.display_alarms = function(alarms) {
	// clear old alert first
	if (this.alarm_dialog)
	this.alarm_dialog.dialog('destroy');

	this.alarm_dialog = $('<div>').attr('id', 'alarm-display');

	var actions, adismiss, asnooze, alarm, html, event_ids = [];
	for (var actions, html, alarm, i=0; i < alarms.length; i++) {
	alarm = alarms[i];
	alarm.start = $.fullCalendar.parseISO8601(alarm.start, true);
	alarm.end = $.fullCalendar.parseISO8601(alarm.end, true);
	event_ids.push(alarm.id);

	html = '<h3 class="event-title">' + Q(alarm.title) + '</h3>';
	html += '<div class="event-section">' + Q(alarm.location) + '</div>';
	html += '<div class="event-section">' + Q(event_date_text(alarm)) + '</div>';

	adismiss = $('<a href="#" class="alarm-action-dismiss"></a>').html(rcmail.gettext('dismiss','calendar')).click(function(){
	me.dismiss_link = $(this);
	me.dismiss_alarm(me.dismiss_link.data('id'), 0);
	});
	asnooze = $('<a href="#" class="alarm-action-snooze"></a>').html(rcmail.gettext('snooze','calendar')).click(function(){
	me.snooze_dropdown($(this));
	});
	actions = $('<div>').addClass('alarm-actions').append(adismiss.data('id', alarm.id)).append(asnooze.data('id', alarm.id));

	$('<div>').addClass('alarm-item').html(html).append(actions).appendTo(this.alarm_dialog);
	}

	var buttons = {};
	buttons[rcmail.gettext('dismissall','calendar')] = function() {
	// submit dismissed event_ids to server
	me.dismiss_alarm(me.alarm_ids.join(','), 0);
	$(this).dialog('close');
	};

	this.alarm_dialog.appendTo(document.body).dialog({
	modal: false,
	resizable: true,
	closeOnEscape: false,
	dialogClass: 'alarm',
	title: '<span class="ui-icon ui-icon-alert" style="float:left; margin:0 4px 0 0"></span>' + rcmail.gettext('alarmtitle', 'calendar'),
	buttons: buttons,
	close: function() {
	$('#alarm-snooze-dropdown').hide();
	$(this).dialog('destroy').remove();
	me.alarm_dialog = null;
	me.alarm_ids = null;
	},
	drag: function(event, ui) {
	$('#alarm-snooze-dropdown').hide();
	}
	});
	this.alarm_ids = event_ids;
	};

	// show a drop-down menu with a selection of snooze times
	this.snooze_dropdown = function(link)
	{
	if (!this.snooze_popup) {
	this.snooze_popup = $('#alarm-snooze-dropdown');
	$('#alarm-snooze-dropdown a').click(function(e){
	var time = String(this.href).replace(/.+#/, '');
	me.dismiss_alarm($('#alarm-snooze-dropdown').data('id'), time);
	return false;
	});
	}

	// hide visible popup
	if (this.snooze_popup.is(':visible') && this.snooze_popup.data('id') == link.data('id')) {
	this.snooze_popup.hide();
	this.dismiss_link = null;
	}
	else { // open popup below the clicked link
	var pos = link.offset();
	pos.top += link.height() + 2;
	this.snooze_popup.data('id', link.data('id')).css({ top:Math.floor(pos.top)+'px', left:Math.floor(pos.left)+'px' }).show();
	this.dismiss_link = link;
	}
	};

	// dismiss or snooze alarms for the given event
	this.dismiss_alarm = function(id, snooze)
	{
	$('#alarm-snooze-dropdown').hide();
	rcmail.http_post('event', { action:'dismiss', e:{ id:id, snooze:snooze } });

	// remove dismissed alarm from list
	if (this.dismiss_link) {
	this.dismiss_link.closest('div.alarm-item').hide();
	var new_ids = jQuery.grep(this.alarm_ids, function(v){ return v != id; });
	if (new_ids.length)
	this.alarm_ids = new_ids;
	else
	this.alarm_dialog.dialog('close');
	}

	this.dismiss_link = null;
	};

	// 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' };

	// reset form first
	var form = $('#calendarform > form');
	form.get(0).reset();

	var name = $('#calendar-name').val(calendar.editname \|\| calendar.name);
	var color = $('#calendar-color').val(calendar.color).miniColors('value', calendar.color);

	// dialog buttons
	var buttons = {};

	buttons[rcmail.gettext('save', 'calendar')] = function() {
	// 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 = {
	name: name.val(),
	color: color.val().replace(/^#/, '')
	};
	if (calendar.id)
	data.id = calendar.id;

	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,
	title: rcmail.gettext((calendar.id ? 'editcalendar' : 'createcalendar'), 'calendar'),
	close: function() {
	$dialog.dialog("destroy").hide();
	},
	buttons: buttons,
	minWidth: 400,
	width: 420
	}).show();

	name.select();
	};

	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];
	}
	};


	/* 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].active) {
	fc.fullCalendar('removeEventSource', this.calendars[sid]);
	sources.push(sid);
	}
	}
	id += '@'+sources.join(',');

	// just refetch events if query didn't change
	if (this.search_request == id) {
	fc.fullCalendar('refetchEvents');
	return;
	}
	// remove old search results
	else if (this.search_source) {
	fc.fullCalendar('removeEventSource', this.search_source);
	}
	else {
	this.default_view = fc.fullCalendar('getView').name;
	}

	// replace event source from fullcalendar
	this.search_request = id;
	this.search_source = {
	url: "./?_task=calendar&_action=search_events&q="+escape(q)+'&source='+escape(sources.join(',')),
	editable: false
	};

	fc.fullCalendar('option', 'listSections', 'month');
	fc.fullCalendar('addEventSource', this.search_source);
	fc.fullCalendar('changeView', 'table');
	}
	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) {
	// restore original event sources and view mode from fullcalendar
	fc.fullCalendar('option', 'listSections', 'smart');
	fc.fullCalendar('removeEventSource', this.search_source);
	for (var sid in this.calendars) {
	if (this.calendars[sid] && this.calendars[sid].active)
	fc.fullCalendar('addEventSource', this.calendars[sid]);
	}
	if (this.default_view)
	fc.fullCalendar('changeView', this.default_view);

	this.search_request = this.search_source = null;
	}
	};

	// callback if all sources have been fetched from server
	this.events_loaded = function(count)
	{
	if (this.search_request && !count)
	this._search_message = rcmail.display_message(rcmail.gettext('searchnoresults', 'calendar'), 'notice');
	}


	/* 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);

	if ((active = ($.inArray(String(id), settings.hidden_calendars) < 0))) {
	this.calendars[id].active = true;
	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;
	settings.hidden_calendars = $.map(settings.hidden_calendars, function(v){ return v == id ? null : v; });
	}
	else {
	action = 'removeEventSource';
	me.calendars[id].active = false;
	settings.hidden_calendars.push(id);
	}
	// just trigger search again (don't save prefs?)
	if (me.search_request) {
	me.quicksearch();
	}
	else { // add/remove event source
	fc.fullCalendar(action, me.calendars[id]);
	rcmail.save_pref({ name:'hidden_calendars', value:settings.hidden_calendars.join(',') });
	}
	}
	}).data('id', id).get(0).checked = active;

	$(li).click(function(e){
	var id = $(this).data('id');
	rcmail.select_folder(id, me.selected_calendar, 'rcmlical');
	rcmail.enable_command('calendar-edit','calendar-remove', !me.calendars[id].readonly);
	me.selected_calendar = id;
	}).data('id', id);
	}

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

	// initalize the fullCalendar plugin
	var fc = $('#calendar').fullCalendar({
	header: {
	left: 'prev,next today',
	center: 'title',
	right: 'agendaDay,agendaWeek,month,table'
	},
	aspectRatio: 1,
	ignoreTimezone: true, // will treat the given date strings as in local (browser's) timezone
	height: $('#main').height(),
	eventSources: event_sources,
	monthNames : settings['months'],
	monthNamesShort : settings['months_short'],
	dayNames : settings['days'],
	dayNamesShort : settings['days_short'],
	firstDay : settings['first_day'],
	firstHour : settings['first_hour'],
	slotMinutes : 60/settings['timeslots'],
	timeFormat: {
	'': settings['time_format'],
	agenda: settings['time_format'] + '{ - ' + settings['time_format'] + '}',
	list: settings['time_format'] + '{ - ' + settings['time_format'] + '}',
	table: settings['time_format'] + '{ - ' + settings['time_format'] + '}'
	},
	axisFormat : settings['time_format'],
	columnFormat: {
	month: 'ddd', // Mon
	week: 'ddd ' + settings['date_short'], // Mon 9/7
	day: 'dddd ' + settings['date_short'], // Monday 9/7
	list: settings['date_agenda'],
	table: settings['date_agenda']
	},
	titleFormat: {
	month: 'MMMM yyyy',
	week: settings['date_long'].replace(/ yyyy/, '[ yyyy]') + "{ '—' " + settings['date_long'] + "}",
	day: 'dddd ' + settings['date_long'],
	list: settings['date_long'],
	table: settings['date_long']
	},
	listSections: 'smart',
	listRange: 60, // show 60 days in list view
	tableCols: ['handle', 'date', 'time', 'title', 'location'],
	defaultView: settings['default_view'],
	allDayText: rcmail.gettext('all-day', 'calendar'),
	buttonText: {
	today: settings['today'],
	day: rcmail.gettext('day', 'calendar'),
	week: rcmail.gettext('week', 'calendar'),
	month: rcmail.gettext('month', 'calendar'),
	table: rcmail.gettext('agenda', 'calendar')
	},
	selectable: true,
	selectHelper: true,
	loading: function(isLoading) {
	this._rc_loading = rcmail.set_busy(isLoading, 'loading', this._rc_loading);
	// trigger callback
	if (!isLoading && me.search_request)
	me.events_loaded($(this).fullCalendar('clientEvents').length);
	},
	// event rendering
	eventRender: function(event, element, view) {
	if (view.name != 'list' && view.name != 'table')
	element.attr('title', event.title);
	if (view.name == 'month') {
	/* attempt to limit the number of events displayed
	(could also be used to init fish-eye-view)
	var max = 4; // to be derrived from window size
	var sday = event.start.getMonth()*12 + event.start.getDate();
	var eday = event.end.getMonth()*12 + event.end.getDate();
	if (!me.eventcount[sday]) me.eventcount[sday] = 1;
	else me.eventcount[sday]++;
	if (!me.eventcount[eday]) me.eventcount[eday] = 1;
	else if (eday != sday) me.eventcount[eday]++;

	if (me.eventcount[sday] > max \|\| me.eventcount[eday] > max)
	return false;
	*/
	}
	else {
	if (event.location) {
	element.find('div.fc-event-title').after('<div class="fc-event-location">@ ' + Q(event.location) + '</div>');
	}
	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>');
	}
	},
	// 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
	return event_edit_dialog('new', { start:date, end:date, allDay:allDay, calendar:me.selected_calendar });

	if (!ignore_click) {
	view.calendar.gotoDate(date);
	fullcalendar_update();
	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) {
	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 = event.start;
	}
	// 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
	};
	if (event.recurrence)
	recurring_edit_confirm(data, 'move');
	else
	rcmail.http_post('event', { action:'move', e:data });
	},
	// callback for event resizing
	eventResize: function(event, delta) {
	// send resize request to server
	var data = {
	id: event.id,
	calendar: event.calendar,
	start: date2unixtime(event.start),
	end: date2unixtime(event.end),
	};
	if (event.recurrence)
	recurring_edit_confirm(data, 'resize');
	else
	rcmail.http_post('event', { action:'resize', e:data });
	},
	viewDisplay: function(view) {
	me.eventcount = [];
	window.setTimeout(function(){ $('div.fc-content').css('overflow', view.name == 'month' ? 'auto' : 'hidden') }, 10);
	},
	windowResize: function(view) {
	me.eventcount = [];
	}
	});


	// event handler for clicks on calendar week cell of the datepicker widget
	var init_week_events = function(){
	$('#datepicker table.ui-datepicker-calendar td.ui-datepicker-week-col').click(function(e){
	var base_date = minical.datepicker('getDate');
	var day_off = base_date.getDay() - 1;
	if (day_off < 0) day_off = 6;
	var base_kw = $.datepicker.iso8601Week(base_date);
	var kw = parseInt($(this).html());
	var diff = (kw - base_kw) * 7 * 86400000;
	// select monday of the chosen calendar week
	var date = new Date(base_date.getTime() - day_off * 86400000 + diff);
	fc.fullCalendar('gotoDate', date).fullCalendar('setDate', date).fullCalendar('changeView', 'agendaWeek');
	minical.datepicker('setDate', date);
	window.setTimeout(init_week_events, 10);
	}).css('cursor', 'pointer');
	};

	// initialize small calendar widget using jQuery UI datepicker
	var 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);
	window.setTimeout(init_week_events, 10);
	},
	onChangeMonthYear: function(year, month, inst) {
	window.setTimeout(init_week_events, 10);
	var d = minical.datepicker('getDate');
	d.setYear(year);
	d.setMonth(month - 1);
	minical.data('year', year).data('month', month);
	//fc.fullCalendar('gotoDate', d).fullCalendar('setDate', d);
	},
	}));
	window.setTimeout(init_week_events, 10);

	// react on fullcalendar buttons
	var fullcalendar_update = function() {
	var d = fc.fullCalendar('getDate');
	minical.datepicker('setDate', d);
	window.setTimeout(init_week_events, 10);
	};
	$("#calendar .fc-button-prev").click(fullcalendar_update);
	$("#calendar .fc-button-next").click(fullcalendar_update);
	$("#calendar .fc-button-today").click(fullcalendar_update);

	// format time string
	var formattime = function(hour, minutes) {
	return ((hour < 10) ? "0" : "") + hour + ((minutes < 10) ? ":0" : ":") + minutes;
	};

	// 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']));
	};

	// init event dialog
	$('#eventtabs').tabs();
	$('#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-allday').click(function(){ $('#edit-starttime, #edit-endtime')[(this.checked?'hide':'show')](); });

	// 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: function(p, callback) {
	/* Time completions */
	var result = [];
	var now = new Date();
	var full = p.term - 1 > 0 \|\| p.term.length > 1;
	var hours = full? p.term - 0 : 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 = 0; h < hours; h++)
	result.push(formattime(h, 0));
	// list 15min steps for the next two hours
	for (; h < hour + 2; h++) {
	while (min < 60) {
	result.push(formattime(h, min));
	min += step;
	}
	min = 0;
	}
	// list the remaining hours till 23:00
	while (h < 24)
	result.push(formattime((h++), 0));
	return callback(result);
	},
	open: function(event, ui) {
	// scroll to current time
	var widget = $(this).autocomplete('widget');
	var menu = $(this).data('autocomplete').menu;
	var val = $(this).val();
	var li, html, offset = 0;
	widget.children().each(function(){
	li = $(this);
	html = li.children().first().html();
	if (html < val)
	offset += li.height();
	if (html == val)
	menu.activate($.Event({ type: 'mouseenter' }), li);
	});
	widget.scrollTop(offset - 1);
	}
	})
	.click(function() { // show drop-down upon clicks
	$(this).autocomplete('search', $(this).val() ? $(this).val().replace(/\D.*/, "") : " ");
	});

	// 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) });

	$('#calendar-color').miniColors();

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

	} // end rcube_calendar class


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

	// configure toobar buttons
	rcmail.register_command('addevent', function(){ cal.add_event(); }, 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);

	// 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.reload_calendar', function(p){ $('#calendar').fullCalendar('refetchEvents', cal.calendars[p.source]); });
	rcmail.addEventListener('plugin.destroy_source', function(p){ cal.calendar_destroy_source(p.id); });


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

	$(window).resize(function() {
	$('#calendar').fullCalendar('option', 'height', $('#main').height());
	}).resize();

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

	});

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