--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/calendar/calendar_ui.js	Sat Jan 13 08:56:12 2018 -0500
@@ -0,0 +1,4216 @@
+/**
+ * Client UI Javascript for the Calendar plugin
+ *
+ * @author Lazlo Westerhof <hello@lazlo.me>
+ * @author Thomas Bruederli <bruederli@kolabsys.com>
+ *
+ * @licstart  The following is the entire license notice for the
+ * JavaScript code in this file.
+ *
+ * Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
+ * Copyright (C) 2014-2015, 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/>.
+ *
+ * @licend  The above is the entire license notice
+ * for the JavaScript code in this file.
+ */
+
+// 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;
+    this.calendars = {};
+    this.quickview_sources = [];
+
+
+    /***  private vars  ***/
+    var DAY_MS = 86400000;
+    var HOUR_MS = 3600000;
+    var me = this;
+    var day_clicked = day_clicked_ts = 0;
+    var ignore_click = false;
+    var event_defaults = { free_busy:'busy', alarms:'' };
+    var event_attendees = [];
+    var calendars_list;
+    var calenders_search_list;
+    var calenders_search_container;
+    var search_calendars = {};
+    var attendees_list;
+    var resources_list;
+    var resources_treelist;
+    var resources_data = {};
+    var resources_index = [];
+    var resource_owners = {};
+    var resources_events_source = { url:null, editable:false };
+    var freebusy_ui = { workinhoursonly:false, needsupdate:false };
+    var freebusy_data = {};
+    var current_view = null;
+    var count_sources = [];
+    var exec_deferred = bw.ie6 ? 5 : 1;
+    var sensitivitylabels = { 'public':rcmail.gettext('public','calendar'), 'private':rcmail.gettext('private','calendar'), 'confidential':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
+    };
+
+    // global fullcalendar settings
+    var fullcalendar_defaults = {
+      aspectRatio: 1,
+      ignoreTimezone: true,  // will treat the given date strings as in local (browser's) timezone
+      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: 7,  // advance one week 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: '&nbsp;&#9668;&nbsp;',
+        next: '&nbsp;&#9658;&nbsp;',
+        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')
+      },
+      currentTimeIndicator: settings.time_indicator,
+      // event rendering
+      eventRender: function(event, element, view) {
+        if (view.name != 'list' && view.name != 'table') {
+          var prefix = event.sensitivity && event.sensitivity != 'public' ? 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">@&nbsp;' + Q(event.location) + '</div>');
+          }
+          if (event.sensitivity && event.sensitivity != 'public')
+            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 || (event.valarms && event.valarms.length))
+            element.find('div.fc-event-time').append('<i class="fc-icon-alarms"></i>');
+        }
+        if (event.status) {
+          element.addClass('cal-event-status-' + String(event.status).toLowerCase());
+        }
+
+        element.attr('aria-label', event.title + ', ' + me.event_date_text(event, true));
+      },
+      // 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 when a specific event is clicked
+      eventClick: function(event, ev, view) {
+        if (!event.temp && String(event.className).indexOf('fc-type-freebusy') < 0)
+          event_show_dialog(event, ev);
+      }
+    };
+
+    /***  imports  ***/
+    var Q = this.quote_html;
+    var text2html = this.text2html;
+    var event_date_text = this.event_date_text;
+    var parse_datetime = this.parse_datetime;
+    var date2unixtime = this.date2unixtime;
+    var fromunixtime = this.fromunixtime;
+    var parseISO8601 = this.parseISO8601;
+    var date2servertime = this.date2ISO8601;
+    var render_message_links = this.render_message_links;
+
+
+    /***  private methods  ***/
+
+    // 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, chr, last;
+
+      for (q = p = i = 0; i < strlen; i++) {
+        chr = str.charAt(i);
+        if (chr == '"' && last != '\\') {
+          q = !q;
+        }
+        else if (!q && chr == delimiter) {
+          result.push(str.substring(p, i));
+          p = i + 1;
+        }
+        last = chr;
+      }
+
+      result.push(str.substr(p));
+      return result;
+    };
+
+    // Change the first charcter to uppercase
+    var ucfirst = function(str)
+    {
+        return str.charAt(0).toUpperCase() + str.substr(1);
+    };
+
+    // 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;
+    };
+
+    // fix date if jumped over a DST change
+    var fix_date = function(date)
+    {
+      if (date.getHours() == 23)
+        date.setTime(date.getTime() + HOUR_MS);
+      else if (date.getHours() > 0)
+        date.setHours(0);
+    };
+
+    var date2timestring = function(date, dateonly)
+    {
+      return date2servertime(date).replace(/[^0-9]/g, '').substr(0, (dateonly ? 8 : 14));
+    }
+
+    var format_datetime = function(date, mode, voice)
+    {
+      return me.format_datetime(date, mode, voice);
+    }
+
+    var render_link = function(url)
+    {
+      var islink = false, href = url;
+      if (url.match(/^[fhtpsmailo]+?:\/\//i)) {
+        islink = true;
+      }
+      else if (url.match(/^[a-z0-9.-:]+(\/|$)/i)) {
+        islink = true;
+        href = 'http://' + url;
+      }
+      return islink ? '<a href="' + Q(href) + '" target="_blank">' + Q(url) + '</a>' : Q(url);
+    }
+
+    // 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'];
+    };
+
+    var load_attachment = function(event, att)
+    {
+      var query = { _id: att.id, _event: event.recurrence_id || event.id, _cal:event.calendar, _frame: 1 };
+      if (event.rev)
+        query._rev = event.rev;
+
+      if (event.calendar == "--invitation--itip")
+        $.extend(query, {_uid: event._uid, _part: event._part, _mbox: event._mbox});
+
+      // open attachment in frame if it's of a supported mimetype
+      if (id && att.mimetype && $.inArray(att.mimetype, settings.mimetypes)>=0) {
+        if (rcmail.open_window(rcmail.url('get-attachment', query), true, true)) {
+          return;
+        }
+      }
+
+      query._frame = null;
+      query._download = 1;
+      rcmail.goto_url('get-attachment', query, 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 = $('<a href="#delete" />')
+            .attr('title', rcmail.gettext('delete'))
+            .attr('aria-label', rcmail.gettext('delete') + ' ' + Q(elem.name))
+            .addClass('delete')
+            .click({id: elem.id}, function(e) { remove_attachment(this, e.data.id); return false; });
+
+          if (!rcmail.env.deleteicon)
+            content.html(rcmail.gettext('delete'));
+          else {
+            img = document.createElement('IMG');
+            img.src = rcmail.env.deleteicon;
+            img.alt = rcmail.gettext('delete');
+            content.append(img);
+          }
+
+          content.appendTo(li);
+        }
+
+        // name/link
+        content = $('<a href="#load" />')
+          .html(Q(elem.name))
+          .addClass('file')
+          .click({event: event, att: elem}, function(e) {
+            load_attachment(e.data.event, e.data.att);
+            return false;
+          })
+          .appendTo(li);
+
+        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, ev, temp)
+    {
+      var $dialog = $("#eventshow");
+      var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:false, rights:'lrs' };
+
+      if (!temp)
+        me.selected_event = event;
+
+      if ($dialog.is(':ui-dialog'))
+        $dialog.dialog('close');
+
+      // remove status-* and sensitivity-* classes
+      $dialog.removeClass(function(i, oldclass) {
+          var oldies = String(oldclass).split(' ');
+          return $.grep(oldies, function(cls) { return cls.indexOf('status-') === 0 || cls.indexOf('sensitivity-') === 0 }).join(' ');
+      });
+
+      // convert start/end dates if not done yet by fullcalendar
+      if (typeof event.start == 'string')
+        event.start = parseISO8601(event.start);
+      if (typeof event.end == 'string')
+        event.end = parseISO8601(event.end);
+
+      // allow other plugins to do actions when event form is opened
+      rcmail.triggerEvent('calendar-event-init', {o: 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));
+      if (event.vurl)
+        $('#event-url').show().children('.event-text').html(render_link(event.vurl));
+      
+      // 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.valarms && event.alarms_text)
+        $('#event-alarm').show().children('.event-text').html(Q(event.alarms_text).replace(',', ',<br>'));
+      
+      if (calendar.name)
+        $('#event-calendar').show().children('.event-text').html(Q(calendar.name)).attr('class', 'event-text cal-'+calendar.id).css('color', calendar.textColor || calendar.color || '');
+      if (event.categories)
+        $('#event-category').show().children('.event-text').html(Q(event.categories)).attr('class', 'event-text cat-'+String(event.categories).toLowerCase().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.status) {
+        var status_lc = String(event.status).toLowerCase();
+        $('#event-status').show().children('.event-text').text(rcmail.gettext('status-'+status_lc,'calendar'));
+        $('#event-status-badge > span').text(rcmail.gettext('status-'+status_lc,'calendar'));
+        $dialog.addClass('status-'+status_lc);
+      }
+      if (event.sensitivity && event.sensitivity != 'public') {
+        $('#event-sensitivity').show().children('.event-text').text(sensitivitylabels[event.sensitivity]);
+        $('#event-status-badge > span').text(sensitivitylabels[event.sensitivity]);
+        $dialog.addClass('sensitivity-'+event.sensitivity);
+      }
+      if (event.created || event.changed) {
+        var created = parseISO8601(event.created),
+          changed = parseISO8601(event.changed)
+        $('#event-created-changed .event-created').html(Q(created ? format_datetime(created) : rcmail.gettext('unknown','calendar')))
+        $('#event-created-changed .event-changed').html(Q(changed ? format_datetime(changed) : rcmail.gettext('unknown','calendar')))
+        $('#event-created-changed').show()
+      }
+
+      // create attachments list
+      if ($.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?
+      }
+
+      // build attachments list
+      $('#event-links').hide();
+      if ($.isArray(event.links) && event.links.length) {
+          render_message_links(event.links || [], $('#event-links').children('.event-text'), false, 'calendar');
+          $('#event-links').show();
+      }
+
+      // list event attendees
+      if (calendar.attendees && event.attendees) {
+        // sort resources to the end
+        event.attendees.sort(function(a,b) {
+          var j = a.cutype == 'RESOURCE' ? 1 : 0,
+              k = b.cutype == 'RESOURCE' ? 1 : 0;
+          return (j - k);
+        });
+
+        var data, mystatus = null, rsvp, line, morelink, html = '', overflow = '',
+          organizer = me.is_organizer(event);
+
+        for (var j=0; j < event.attendees.length; j++) {
+          data = event.attendees[j];
+          if (data.email) {
+            if (data.role != 'ORGANIZER' && settings.identity.emails.indexOf(';'+data.email) >= 0) {
+              mystatus = data.status.toLowerCase();
+              if (data.status == 'NEEDS-ACTION' || data.status == 'TENTATIVE' || data.rsvp)
+                rsvp = mystatus;
+            }
+          }
+
+          line = rcube_libcalendaring.attendee_html(data);
+
+          if (morelink)
+            overflow += ' ' + line;
+          else
+            html += ' ' + line;
+
+          // stop listing attendees
+          if (j == 7 && event.attendees.length >= 7) {
+            morelink = $('<a href="#more" class="morelink"></a>').html(rcmail.gettext('andnmore', 'calendar').replace('$nr', event.attendees.length - j - 1));
+          }
+        }
+
+        if (html && (event.attendees.length > 1 || !organizer)) {
+          $('#event-attendees').show()
+            .children('.event-text')
+            .html(html)
+            .find('a.mailtolink').click(event_attendee_click);
+
+          // display all attendees in a popup when clicking the "more" link
+          if (morelink) {
+            $('#event-attendees .event-text').append(morelink);
+            morelink.click(function(e){
+              rcmail.show_popup_dialog(
+                '<div id="all-event-attendees" class="event-attendees">' + html + overflow + '</div>',
+                rcmail.gettext('tabattendees','calendar'),
+                null,
+                { width:450, modal:false });
+              $('#all-event-attendees a.mailtolink').click(event_attendee_click);
+              return false;
+            })
+          }
+        }
+
+        if (mystatus && !rsvp) {
+          $('#event-partstat').show().children('.changersvp')
+            .removeClass('accepted tentative declined delegated needs-action')
+            .addClass(mystatus)
+            .children('.event-text')
+            .text(rcmail.gettext('status' + mystatus, 'libcalendaring'));
+        }
+
+        var show_rsvp = rsvp && !organizer && event.status != 'CANCELLED' && me.has_permission(calendar, 'v');
+        $('#event-rsvp')[(show_rsvp ? 'show' : 'hide')]();
+        $('#event-rsvp .rsvp-buttons input').prop('disabled', false).filter('input[rel='+mystatus+']').prop('disabled', true);
+
+        if (show_rsvp && event.comment)
+          $('#event-rsvp-comment').show().children('.event-text').html(Q(event.comment));
+
+        $('#event-rsvp a.reply-comment-toggle').show();
+        $('#event-rsvp .itip-reply-comment textarea').hide().val('');
+
+        if (event.recurrence && event.id) {
+          var sel = event._savemode || (event.thisandfuture ? 'future' : (event.isexception ? 'current' : 'all'));
+          $('#event-rsvp .rsvp-buttons').addClass('recurring');
+        }
+        else {
+          $('#event-rsvp .rsvp-buttons').removeClass('recurring');
+        }
+      }
+
+      var buttons = [];
+      if (!temp && calendar.editable && event.editable !== false) {
+        buttons.push({
+          text: rcmail.gettext('edit', 'calendar'),
+          click: function() {
+            event_edit_dialog('edit', event);
+          }
+        });
+      }
+      if (!temp && me.has_permission(calendar, 'td') && event.editable !== false) {
+        buttons.push({
+          text: rcmail.gettext('delete', 'calendar'),
+          'class': 'delete',
+          click: function() {
+            me.delete_event(event);
+            $dialog.dialog('close');
+          }
+        });
+      }
+
+      if (!buttons.length) {
+        buttons.push({
+          text: rcmail.gettext('close', 'calendar'),
+          click: 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: me.event_date_text(event),
+        open: function() {
+          $dialog.attr('aria-hidden', 'false');
+          setTimeout(function(){
+            $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
+          }, 5);
+        },
+        close: function() {
+          $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
+          rcmail.command('menu-close','eventoptionsmenu');
+          $('.libcal-rsvp-replymode').hide();
+        },
+        dragStart: function() {
+          rcmail.command('menu-close','eventoptionsmenu');
+          $('.libcal-rsvp-replymode').hide();
+        },
+        resizeStart: function() {
+          rcmail.command('menu-close','eventoptionsmenu');
+          $('.libcal-rsvp-replymode').hide();
+        },
+        buttons: buttons,
+        minWidth: 320,
+        width: 420
+      }).show();
+
+      // remember opener element (to be focused on close)
+      $dialog.data('opener', ev && rcube_event.is_keyboard(ev) ? ev.target : null);
+
+      // set voice title on dialog widget
+      $dialog.dialog('widget').removeAttr('aria-labelledby')
+        .attr('aria-label', me.event_date_text(event, true) + ', ', event.title);
+
+      // set dialog size according to content
+      me.dialog_resize($dialog.get(0), $dialog.height(), 420);
+
+      // add link for "more options" drop-down
+      if (!temp && !event.temporary && event.calendar != '_resource') {
+        $('<a>')
+          .attr('href', '#')
+          .html(rcmail.gettext('eventoptions','calendar'))
+          .addClass('dropdown-link')
+          .click(function(e) {
+            return rcmail.command('menu-open','eventoptionsmenu', this, e)
+          })
+          .appendTo($dialog.parent().find('.ui-dialog-buttonset'));
+      }
+
+      rcmail.enable_command('event-history', calendar.history)
+
+      rcmail.triggerEvent('calendar-event-dialog', {dialog: $dialog});
+    };
+
+    // event handler for clicks on an attendee link
+    var event_attendee_click = function(e)
+    {
+      var cutype = $(this).attr('data-cutype'),
+        mailto = this.href.substr(7);
+      if (rcmail.env.calendar_resources && cutype == 'RESOURCE') {
+        event_resources_dialog(mailto);
+      }
+      else {
+        rcmail.command('compose', mailto, e ? e.target : null, e);
+      }
+      return false;
+    };
+
+    // bring up the event dialog (jquery-ui popup)
+    var event_edit_dialog = function(action, event)
+    {
+      // copy opener element from show dialog
+      var op_elem = $("#eventshow:ui-dialog").data('opener');
+
+      // close show dialog first
+      $("#eventshow:ui-dialog").data('opener', null).dialog('close');
+
+      var $dialog = $('<div>');
+      var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:true, rights: action=='new' ? 'lrwitd' : 'lrs' };
+      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-panel-recurrence input, #event-panel-recurrence select, #event-panel-attachments input').prop('disabled', false);
+      $('#event-panel-recurrence, #event-panel-attachments').removeClass('disabled');
+
+      // allow other plugins to do actions when event form is opened
+      rcmail.triggerEvent('calendar-event-init', {o: event});
+
+      // event details
+      var title = $('#edit-title').val(event.title || '');
+      var location = $('#edit-location').val(event.location || '');
+      var description = $('#edit-description').text(event.description || '');
+      var vurl = $('#edit-url').val(event.vurl || '');
+      var categories = $('#edit-categories').val(event.categories);
+      var calendars = $('#edit-calendar').val(event.calendar);
+      var eventstatus = $('#edit-event-status').val(event.status);
+      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);
+      var comment = $('#edit-attendees-comment');
+
+      // make sure any calendar is selected
+      if (!calendars.val())
+        calendars.val($('option:first', calendars).attr('value'));
+
+      invite.checked = settings.itip_notify & 1 > 0;
+      notify.checked = me.has_attendees(event) && invite.checked;
+
+      if (event.allDay) {
+        starttime.val("12:00").hide();
+        endtime.val("13:00").hide();
+        allday.checked = true;
+      }
+      else {
+        allday.checked = false;
+      }
+
+      // set calendar selection according to permissions
+      calendars.find('option').each(function(i, opt) {
+        var cal = me.calendars[opt.value] || {};
+        $(opt).prop('disabled', !(cal.editable || (action == 'new' && me.has_permission(cal, 'i'))))
+      });
+
+      // set alarm(s)
+      me.set_alarms_edit('#edit-alarms', action != 'new' && event.valarms && calendar.alarms ? event.valarms : []);
+
+      // 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) {
+        $('<option>').attr('value', event.categories).text(event.categories).appendTo(categories).prop('selected', true);
+      }
+
+      if ($.isArray(event.links) && event.links.length) {
+          render_message_links(event.links, $('#edit-event-links .event-text'), true, 'calendar');
+          $('#edit-event-links').show();
+      }
+      else {
+          $('#edit-event-links').hide();
+      }
+
+      // show warning if editing a recurring event
+      if (event.id && event.recurrence) {
+        var sel = event._savemode || (event.thisandfuture ? 'future' : (event.isexception ? 'current' : 'all'));
+        $('#edit-recurring-warning').show();
+        $('input.edit-recurring-savemode[value="'+sel+'"]').prop('checked', true).change();
+      }
+      else
+        $('#edit-recurring-warning').hide();
+
+      // init attendees tab
+      var organizer = !event.attendees || me.is_organizer(event),
+        allow_invitations = organizer || (calendar.owner && calendar.owner == 'anonymous') || settings.invite_shared;
+      event_attendees = [];
+      attendees_list = $('#edit-attendees-table > tbody').html('');
+      resources_list = $('#edit-resources-table > tbody').html('');
+      $('#edit-attendees-notify')[(action != 'new' && allow_invitations && me.has_attendees(event) && (settings.itip_notify & 2) ? 'show' : 'hide')]();
+      $('#edit-localchanges-warning')[(action != 'new' && me.has_attendees(event) && !(allow_invitations || (calendar.owner && me.is_organizer(event, calendar.owner))) ? 'show' : 'hide')]();
+
+      var load_attendees_tab = function()
+      {
+        var j, data, organizer_attendee, reply_selected = 0;
+        if (event.attendees) {
+          for (j=0; j < event.attendees.length; j++) {
+            data = event.attendees[j];
+            // reset attendee status
+            if (event._savemode == 'new' && data.role != 'ORGANIZER') {
+              data.status = 'NEEDS-ACTION';
+              delete data.noreply;
+            }
+            add_attendee(data, !allow_invitations);
+            if (allow_invitations && data.role != 'ORGANIZER' && !data.noreply)
+              reply_selected++;
+
+            if (data.role == 'ORGANIZER')
+              organizer_attendee = data;
+          }
+        }
+
+        // make sure comment box is visible if at least one attendee has reply enabled
+        // or global "send invitations" checkbox is checked
+        $('#eventedit .attendees-commentbox')[(reply_selected || invite.checked ? 'show' : 'hide')]();
+
+        // select the correct organizer identity
+        var identity_id = 0;
+        $.each(settings.identities, function(i,v){
+          if (organizer && typeof organizer == 'object' && v == organizer.email) {
+            identity_id = i;
+            return false;
+          }
+        });
+
+        // In case the user is not the (shared) event organizer we'll add the organizer to the selection list
+        if (!identity_id && !organizer && organizer_attendee) {
+          var organizer_name = organizer_attendee.email;
+          if (organizer_attendee.name)
+            organizer_name = '"' + organizer_attendee.name + '" <' + organizer_name + '>';
+          $('#edit-identities-list').append($('<option value="0">').text(organizer_name));
+        }
+
+        $('#edit-identities-list').val(identity_id);
+        $('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
+        $('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
+      };
+
+      // attachments
+      var load_attachments_tab = function()
+      {
+        rcmail.enable_command('remove-attachment', calendar.editable && !event.recurrence_id);
+        rcmail.env.deleted_attachments = [];
+        // we're sharing some code for uploads handling with app.js
+        rcmail.env.attachments = [];
+        rcmail.env.compose_id = event.id; // for rcmail.async_upload_form()
+
+        if ($.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 = [];
+      
+      // save action
+      buttons.push({
+        text: rcmail.gettext('save', 'calendar'),
+        'class': 'mainaction',
+        click: 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: date2servertime(start),
+          end: date2servertime(end),
+          allday: allday.checked?1:0,
+          title: title.val(),
+          description: description.val(),
+          location: location.val(),
+          categories: categories.val(),
+          vurl: vurl.val(),
+          free_busy: freebusy.val(),
+          priority: priority.val(),
+          sensitivity: sensitivity.val(),
+          status: eventstatus.val(),
+          recurrence: me.serialize_recurrence(endtime.val()),
+          valarms: me.serialize_alarms('#edit-alarms'),
+          attendees: event_attendees,
+          links: me.selected_event.links,
+          deleted_attachments: rcmail.env.deleted_attachments,
+          attachments: []
+        };
+
+        // 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();
+        });
+
+        if (organizer)
+          data._identity = $('#edit-identities-list option:selected').val();
+
+        // per-attendee notification suppression
+        var need_invitation = false;
+        if (allow_invitations) {
+          $.each(data.attendees, function (i, v) {
+            if (v.role != 'ORGANIZER') {
+              if ($('input.edit-attendee-reply[value="' + v.email + '"]').prop('checked') || v.cutype == 'RESOURCE') {
+                need_invitation = true;
+                delete data.attendees[i]['noreply'];
+              }
+              else if (settings.itip_notify > 0) {
+                data.attendees[i].noreply = 1;
+              }
+            }
+          });
+        }
+
+        // tell server to send notifications
+        if ((data.attendees.length || (event.id && event.attendees.length)) && allow_invitations && (notify.checked || invite.checked || need_invitation)) {
+          data._notify = settings.itip_notify;
+          data._comment = comment.val();
+        }
+
+        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");
+      }  // end click:
+      });
+
+      if (event.id) {
+        buttons.push({
+          text: rcmail.gettext('delete', 'calendar'),
+          'class': 'delete',
+          click: function() {
+            me.delete_event(event);
+            $dialog.dialog('close');
+          }
+        });
+      }
+
+      buttons.push({
+        text: rcmail.gettext('cancel', 'calendar'),
+        click: function() {
+          $dialog.dialog("close");
+        }
+      });
+
+      // show/hide tabs according to calendar's feature support
+      $('#edit-tab-attendees')[(calendar.attendees?'show':'hide')]();
+      $('#edit-tab-resources')[(rcmail.env.calendar_resources?'show':'hide')]();
+      $('#edit-tab-attachments')[(calendar.attachments?'show':'hide')]();
+
+      // activate the first tab
+      $('#eventtabs').tabs('option', 'active', 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'),
+        open: function() {
+          editform.attr('aria-hidden', 'false');
+        },
+        close: function() {
+          editform.hide().attr('aria-hidden', 'true').appendTo(document.body);
+          $dialog.dialog("destroy").remove();
+          rcmail.ksearch_blur();
+          freebusy_data = {};
+          rcmail.env.comm_path = comm_path_before;  // restore comm_path
+          if (op_elem)
+            $(op_elem).focus();
+        },
+        buttons: buttons,
+        minWidth: 500,
+        width: 600
+      }).append(editform.show());  // adding form content AFTERWARDS massively speeds up opening on IE6
+
+      // set dialog size according to form content
+      me.dialog_resize($dialog.get(0), editform.height() + (bw.ie ? 20 : 0), 550);
+
+      title.select();
+
+      // init other tabs asynchronously
+      window.setTimeout(function(){ me.set_recurrence_edit(event); }, exec_deferred);
+      if (calendar.attendees)
+        window.setTimeout(load_attendees_tab, exec_deferred);
+      if (calendar.attachments)
+        window.setTimeout(load_attachments_tab, exec_deferred);
+
+      rcmail.triggerEvent('calendar-event-dialog', {dialog: $dialog});
+    };
+
+    // show event changelog in a dialog
+    var event_history_dialog = function(event)
+    {
+      if (!event.id || !window.libkolab_audittrail)
+        return false
+
+      // render dialog
+      var $dialog = libkolab_audittrail.object_history_dialog({
+        module: 'calendar',
+        container: '#eventhistory',
+        title: rcmail.gettext('objectchangelog','calendar') + ' - ' + event.title + ', ' + me.event_date_text(event),
+
+        // callback function for list actions
+        listfunc: function(action, rev) {
+          me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
+          rcmail.http_post('event', { action:action, e:{ id:event.id, calendar:event.calendar, rev: rev } }, me.loading_lock);
+        },
+
+        // callback function for comparing two object revisions
+        comparefunc: function(rev1, rev2) {
+          me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
+          rcmail.http_post('event', { action:'diff', e:{ id:event.id, calendar:event.calendar, rev1: rev1, rev2: rev2 } }, me.loading_lock);
+        }
+      });
+
+      $dialog.data('event', event);
+
+      // fetch changelog data
+      me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
+      rcmail.http_post('event', { action:'changelog', e:{ id:event.id, calendar:event.calendar } }, me.loading_lock);
+    };
+
+    // callback from server with changelog data
+    var render_event_changelog = function(data)
+    {
+      var $dialog = $('#eventhistory'),
+        event = $dialog.data('event');
+
+      if (data === false || !data.length || !event) {
+        // display 'unavailable' message
+        $('<div class="notfound-message event-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','calendar') + '</div>')
+          .insertBefore($dialog.find('.changelog-table').hide());
+        return;
+      }
+
+      data.module = 'calendar';
+      libkolab_audittrail.render_changelog(data, event, me.calendars[event.calendar]);
+
+      // set dialog size according to content
+      me.dialog_resize($dialog.get(0), $dialog.height(), 600);
+    };
+
+    // callback from server with event diff data
+    var event_show_diff = function(data)
+    {
+      var event = me.selected_event,
+        $dialog = $("#eventdiff");
+
+      $dialog.find('div.event-section, div.event-line, h1.event-title-new').hide().data('set', false).find('.index').html('');
+      $dialog.find('div.event-section.clone, div.event-line.clone').remove();
+
+      // always show event title and date
+      $('.event-title', $dialog).text(event.title).removeClass('event-text-old').show();
+      $('.event-date', $dialog).text(me.event_date_text(event)).show();
+
+      // show each property change
+      $.each(data.changes, function(i,change) {
+        var prop = change.property, r2, html = false,
+          row = $('div.event-' + prop, $dialog).first();
+
+          // special case: title
+          if (prop == 'title') {
+            $('.event-title', $dialog).addClass('event-text-old').text(change['old'] || '--');
+            $('.event-title-new', $dialog).text(change['new'] || '--').show();
+          }
+
+          // no display container for this property
+          if (!row.length) {
+            return true;
+          }
+
+          // clone row if already exists
+          if (row.data('set')) {
+            r2 = row.clone().addClass('clone').insertAfter(row);
+            row = r2;
+          }
+
+          // format dates
+          if (['start','end','changed'].indexOf(prop) >= 0) {
+            if (change['old']) change.old_ = me.format_datetime(parseISO8601(change['old']));
+            if (change['new']) change.new_ = me.format_datetime(parseISO8601(change['new']));
+          }
+          // render description text
+          else if (prop == 'description') {
+            // TODO: show real text diff
+            if (!change.diff_ && change['old']) change.old_ = text2html(change['old']);
+            if (!change.diff_ && change['new']) change.new_ = text2html(change['new']);
+            html = true;
+          }
+          // format attendees struct
+          else if (prop == 'attendees') {
+            if (change['old']) change.old_ = rcube_libcalendaring.attendee_html(change['old']);
+            if (change['new']) change.new_ = rcube_libcalendaring.attendee_html($.extend({}, change['old'] || {}, change['new']));
+            html = true;
+          }
+          // localize priority values
+          else if (prop == 'priority') {
+            var priolabels = [ '', rcmail.gettext('highest'), rcmail.gettext('high'), '', '', rcmail.gettext('normal'), '', '', rcmail.gettext('low'), rcmail.gettext('lowest') ];
+            if (change['old']) change.old_ = change['old'] + ' ' + (priolabels[change['old']] || '');
+            if (change['new']) change.new_ = change['new'] + ' ' + (priolabels[change['new']] || '');
+          }
+          // localize status
+          else if (prop == 'status') {
+            var status_lc = String(event.status).toLowerCase();
+            if (change['old']) change.old_ = rcmail.gettext(String(change['old']).toLowerCase(), 'calendar');
+            if (change['new']) change.new_ = rcmail.gettext(String(change['new']).toLowerCase(), 'calendar');
+          }
+
+          // format attachments struct
+          if (prop == 'attachments') {
+            if (change['old']) event_show_attachments([change['old']], row.children('.event-text-old'), event, false);
+            else            row.children('.event-text-old').text('--');
+            if (change['new']) event_show_attachments([$.extend({}, change['old'] || {}, change['new'])], row.children('.event-text-new'), event, false);
+            else            row.children('.event-text-new').text('--');
+            // remove click handler as we're currentyl not able to display the according attachment contents
+            $('.attachmentslist li a', row).unbind('click').removeAttr('href');
+          }
+          else if (change.diff_) {
+            row.children('.event-text-diff').html(change.diff_);
+            row.children('.event-text-old, .event-text-new').hide();
+          }
+          else {
+            if (!html) {
+              // escape HTML characters
+              change.old_ = Q(change.old_ || change['old'] || '--')
+              change.new_ = Q(change.new_ || change['new'] || '--')
+            }
+            row.children('.event-text-old').html(change.old_ || change['old'] || '--');
+            row.children('.event-text-new').html(change.new_ || change['new'] || '--');
+          }
+
+          // display index number
+          if (typeof change.index != 'undefined') {
+            row.find('.index').html('(' + change.index + ')');
+          }
+
+          row.show().data('set', true);
+
+          // hide event-date line
+          if (prop == 'start' || prop == 'end')
+            $('.event-date', $dialog).hide();
+      });
+
+      var buttons = {};
+      buttons[rcmail.gettext('close', 'calendar')] = function() {
+        $dialog.dialog('close');
+      };
+
+      // open jquery UI dialog
+      $dialog.dialog({
+        modal: false,
+        resizable: true,
+        closeOnEscape: true,
+        title: rcmail.gettext('objectdiff','calendar').replace('$rev1', data.rev1).replace('$rev2', data.rev2) + ' - ' + event.title,
+        open: function() {
+          $dialog.attr('aria-hidden', 'false');
+          setTimeout(function(){
+            $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
+          }, 5);
+        },
+        close: function() {
+          $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
+        },
+        buttons: buttons,
+        minWidth: 320,
+        width: 450
+      }).show();
+
+      // set dialog size according to content
+      me.dialog_resize($dialog.get(0), $dialog.height(), 400);
+    };
+
+    // close the event history dialog
+    var close_history_dialog = function()
+    {
+      $('#eventhistory, #eventdiff').each(function(i, elem) {
+        var $dialog = $(elem);
+        if ($dialog.is(':ui-dialog'))
+          $dialog.dialog('close');
+      });
+    }
+
+    // exports
+    this.event_show_diff = event_show_diff;
+    this.event_show_dialog = event_show_dialog;
+    this.event_history_dialog = event_history_dialog;
+    this.render_event_changelog = render_event_changelog;
+    this.close_history_dialog = close_history_dialog;
+
+    // open a dialog to display detailed free-busy information and to find free slots
+    var event_freebusy_dialog = function()
+    {
+      var $dialog = $('#eventfreebusy'),
+        event = me.selected_event;
+      
+      if ($dialog.is(':ui-dialog'))
+        $dialog.dialog('close');
+      
+      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 / (settings.timeslots || 1));
+      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')) + '">&nbsp;</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">&nbsp;</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', 'NON-PARTICIPANT', 'CHAIR' ];
+            if ((attendee = freebusy_ui.attendees[domid]) && attendee.role != 'ORGANIZER') {
+              var req = attendee.role != 'OPT-PARTICIPANT' && attendee.role != 'NON-PARTICIPANT';
+              var j = $.inArray(attendee.role, roles);
+              j = (j+1) % roles.length;
+              attendee.role = roles[j];
+              $(e.target).parent().attr('class', 'attendee '+String(attendee.role).toLowerCase());
+              
+              // update total display if required-status changed
+              if (req != (roles[j] != 'OPT-PARTICIPANT' && roles[j] != 'NON-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'),
+        open: function() {
+          rcmail.ksearch_blur();
+          $dialog.attr('aria-hidden', 'false').find('#shedule-find-next, #shedule-find-prev').not(':disabled').first().focus();
+        },
+        close: function() {
+          if (bw.ie6)
+            $("#edit-attendees-table").css('visibility','visible');
+          $dialog.dialog("destroy").attr('aria-hidden', 'true').hide();
+          // TODO: focus opener button
+        },
+        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 - $('#attendees-freebusy-table td.times').width();
+      me.dialog_resize($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);
+        fix_date(freebusy_ui.start);
+        
+        // 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);
+          fix_date(freebusy_ui.start);
+        }
+        
+        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),
+        interval = allday ? 1440 : (freebusy_ui.interval * (settings.timeslots || 1));
+        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) {
+          if (lastdate && !allday) break;
+          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 + '">&nbsp;</td>';
+        
+        t += 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 (freebusy_ui.start < freebusy_data.start || 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.hide();
+        if (overlay.data('isdraggable'))
+          overlay.draggable('disable');
+      }
+      else {
+        var i, n, 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,
+          slotnum = freebusy_ui.interval > 60 ? 1 : (60 / freebusy_ui.interval),
+          cells = table.children('thead').find('td'),
+          cell_width = cells.first().get(0).offsetWidth,
+          slotend;
+
+        // iterate through slots to determine position and size of the overlay
+        for (i=0; i < cells.length; i++) {
+          for (n=0; n < slotnum; n++) {
+            slotend = slotstart + slotsize - 1;
+            // event starts in this slot: compute left
+            if (eventstart >= slotstart && eventstart <= slotend) {
+              pos.left = Math.round(i * cell_width + (cell_width / slotnum) * n);
+            }
+            // event ends in this slot: compute width
+            if (eventend >= slotstart && eventend <= slotend) {
+              width = Math.round(i * cell_width + (cell_width / slotnum) * (n + 1)) - pos.left;
+            }
+            slotstart += slotsize;
+          }
+        }
+
+        if (!width)
+          width = table.width() - pos.left;
+
+        // overlay is visible
+        if (width > 0) {
+          overlay.css({ width: (width-4)+'px', height:(table.children('tbody').height() - 4)+'px', left:pos.left+'px', top:pos.top+'px' }).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
+                  // @TODO: round to timeslots?
+                  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('enable');
+        }
+        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 2 days before event
+      fix_date(start);
+      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:date2servertime(clone_date(start, 1)), end:date2servertime(clone_date(end, 2)), interval:interval, _remote:1 },
+            success: function(data) {
+              freebusy_ui.loading--;
+              
+              // find attendee
+              var i, attendee = null;
+              for (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 ts, status,
+                req = attendee.role != 'OPT-PARTICIPANT',
+                start = parseISO8601(data.start);
+
+              freebusy_data.start = new Date(start);
+              freebusy_data.end = parseISO8601(data.end);
+              freebusy_data.interval = data.interval;
+              freebusy_data[data.email] = {};
+
+              for (i=0; i < data.slots.length; i++) {
+                ts = date2timestring(start, data.interval > 60);
+                status = data.slots.charAt(i);
+                freebusy_data[data.email][ts] = status
+                start = new Date(start.getTime() + data.interval * 60000);
+                
+                // set totals
+                if (!freebusy_data.required[ts])
+                  freebusy_data.required[ts] = [0,0,0,0];
+                if (req)
+                  freebusy_data.required[ts][status]++;
+                
+                if (!freebusy_data.all[ts])
+                  freebusy_data.all[ts] = [0,0,0,0];
+                freebusy_data.all[ts][status]++;
+              }
+
+              // 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 = $('#fbrowall').children();
+      var dateonly = freebusy_ui.interval > 60,
+        t, ts = date2timestring(freebusy_ui.start, dateonly),
+        curdate = new Date(),
+        fbdata = freebusy_data[email];
+
+      if (fbdata && fbdata[ts] !== undefined && row.length) {
+        t = freebusy_ui.start.getTime();
+        row.children().each(function(i, cell) {
+          var j, n, attr, last, all_slots = [], slots = [],
+            all_cell = rowall.get(i),
+            cnt = dateonly ? 1 : (60 / freebusy_ui.interval),
+            percent = (100 / cnt);
+
+          for (n=0; n < cnt; n++) {
+            curdate.setTime(t);
+            ts = date2timestring(curdate, dateonly);
+            attr = {
+              'style': 'float:left; width:' + percent.toFixed(2) + '%',
+              'class': fbdata[ts] ? status_classes[fbdata[ts]] : 'unknown'
+            };
+
+            slots.push($('<div>').attr(attr));
+
+            // also update total row if all data was loaded
+            if (!freebusy_ui.loading && freebusy_data.all[ts] && all_cell) {
+              var all_status = freebusy_data.all[ts][2] ? 'busy' : 'unknown',
+                req_status = freebusy_data.required[ts][2] ? 'busy' : 'free';
+
+              for (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];
+              }
+
+              attr['class'] = req_status + ' all-' + all_status;
+
+              // these elements use some specific styling, so we want to minimize their number
+              if (last && last.attr('class') == attr['class'])
+                last.css('width', (percent + parseFloat(last.css('width').replace('%', ''))).toFixed(2) + '%');
+              else {
+                last = $('<div>').attr(attr);
+                all_slots.push(last);
+              }
+            }
+
+            t += freebusy_ui.interval * 60000;
+          }
+
+          $(cell).html('').append(slots);
+          if (all_slots.length)
+            $(all_cell).html('').append(all_slots);
+        });
+      }
+    };
+    
+    // write changed event date/times back to form fields
+    var update_freebusy_dates = function(start, end)
+    {
+      // fix all-day evebt times
+      if (me.selected_event.allDay) {
+        var numdays = Math.floor((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / DAY_MS);
+        start.setHours(12);
+        start.setMinutes(0);
+        end.setTime(start.getTime() + numdays * DAY_MS);
+        end.setHours(13);
+        end.setMinutes(0);
+      }
+      me.selected_event.start = start;
+      me.selected_event.end = end;
+      freebusy_ui.startdate.val($.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)
+    {
+      // exit if free-busy data isn't available yet
+      if (!freebusy_data || !freebusy_data.start)
+        return false;
+
+      var event = me.selected_event,
+        eventstart = clone_date(event.start, event.allDay ? 1 : 0).getTime(),  // calculate with integers
+        eventend = clone_date(event.end, event.allDay ? 2 : 0).getTime(),
+        duration = eventend - eventstart - (event.allDay ? HOUR_MS : 0),  /* make sure we don't cross day borders on DST change */
+        sinterval = freebusy_data.interval * 60000,
+        intvlslots = 1,
+        numslots = Math.ceil(duration / sinterval),
+        fb_start = freebusy_data.start.getTime(),
+        fb_end = freebusy_data.end.getTime(),
+        checkdate, slotend, email, ts, slot, slotdate = new Date(),
+        candidatecount = 0, candidatestart = false, success = false;
+
+      // shift event times to next possible slot
+      eventstart += sinterval * intvlslots * dir;
+      eventend += sinterval * intvlslots * dir;
+
+      // iterate through free-busy slots and find candidates
+      for (slot = dir > 0 ? fb_start : fb_end - sinterval;
+            (dir > 0 && slot < fb_end) || (dir < 0 && slot >= fb_start);
+            slot += sinterval * dir
+      ) {
+        slotdate.setTime(slot);
+        // fix slot if just crossed a DST change
+        if (event.allDay) {
+          fix_date(slotdate);
+          slot = slotdate.getTime();
+        }
+        slotend = slot + sinterval;
+
+        if ((dir > 0 && slotend <= eventstart) || (dir < 0 && slot >= eventend))  // skip
+          continue;
+
+        // respect workinghours setting
+        if (freebusy_ui.workinhoursonly) {
+          if (is_weekend(slotdate) || (freebusy_data.interval <= 60 && !is_workinghour(slotdate))) {  // skip off-hours
+            candidatestart = false;
+            candidatecount = 0;
+            continue;
+          }
+        }
+
+        if (!candidatestart)
+          candidatestart = slot;
+
+        ts = date2timestring(slotdate, freebusy_data.interval > 60);
+
+        // 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][ts] > 1) {
+            candidatestart = false;
+            break;
+          }
+        }
+        
+        // occupied slot
+        if (!candidatestart) {
+          slot += Math.max(0, intvlslots - candidatecount - 1) * sinterval * dir;
+          candidatecount = 0;
+          continue;
+        }
+        else if (dir < 0)
+          candidatestart = slot;
+        
+        candidatecount++;
+        
+        // if candidate is big enough, this is it!
+        if (candidatecount == numslots) {
+          event.start.setTime(candidatestart);
+          event.end.setTime(candidatestart + 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()));
+        
+        // speak new selection
+        rcmail.display_message(rcmail.gettext('suggestedslot', 'calendar') + ': ' + me.event_date_text(event, true), 'voice');
+      }
+      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;
+        $('#edit-startdate').data('duration', Math.round((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / 1000));
+      }
+    };
+
+    // add the given list of participants
+    var add_attendees = function(names, params)
+    {
+      names = explode_quoted_string(names.replace(/,\s*$/, ''), ',');
+
+      // 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($.extend({ email:email, name:name }, params));
+          success = true;
+        }
+        else {
+          alert(rcmail.gettext('noemailwarning'));
+        }
+      }
+      
+      return success;
+    };
+
+    // add the given attendee to the list
+    var add_attendee = function(data, readonly, before)
+    {
+      if (!me.selected_event)
+        return false;
+
+      // check for dupes...
+      var exists = false;
+      $.each(event_attendees, function(i, v){ exists |= (v.email == data.email); });
+      if (exists)
+        return false;
+      
+      var calendar = me.selected_event && me.calendars[me.selected_event.calendar] ? me.calendars[me.selected_event.calendar] : me.calendars[me.selected_calendar];
+
+      var dispname = Q(data.name || data.email);
+      if (data.email)
+        dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink" data-cutype="' + data.cutype + '">' + 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['NON-PARTICIPANT'] = rcmail.gettext('calendar.rolenonparticipant');
+
+      if (data.cutype != 'RESOURCE')
+        opts['CHAIR'] =  rcmail.gettext('calendar.rolechair');
+
+      if (organizer && !readonly)
+          dispname = rcmail.env['identities-selector'];
+      
+      var select = '<select class="edit-attendee-role"' + (organizer || readonly ? ' disabled="true"' : '') + ' aria-label="' + rcmail.gettext('role','calendar') + '">';
+      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="iconlink delete deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';
+      var tooltip = '', status = (data.status || '').toLowerCase(),
+        status_label = rcmail.gettext('status' + status, 'libcalendaring');
+
+      // send invitation checkbox
+      var invbox = '<input type="checkbox" class="edit-attendee-reply" value="' + Q(data.email) +'" title="' + Q(rcmail.gettext('calendar.sendinvitations')) + '" '
+        + (!data.noreply && settings.itip_notify & 1 ? 'checked="checked" ' : '') + '/>';
+
+      if (data['delegated-to'])
+        tooltip = rcmail.gettext('libcalendaring.delegatedto') + ' ' + data['delegated-to'];
+      else if (data['delegated-from'])
+        tooltip = rcmail.gettext('libcalendaring.delegatedfrom') + ' ' + data['delegated-from'];
+      else if (status)
+        tooltip = status_label;
+
+      // add expand button for groups
+      if (data.cutype == 'GROUP') {
+        dispname += ' <a href="#expand" data-email="' + Q(data.email) + '" class="iconbutton add expandlink" title="' + rcmail.gettext('expandattendeegroup','libcalendaring') + '">' +
+          rcmail.gettext('expandattendeegroup','libcalendaring') + '</a>';
+      }
+
+      var img_src = rcmail.assets_path('program/resources/blank.gif');
+      var html = '<td class="role">' + select + '</td>' +
+        '<td class="name"><span class="attendee-name">' + dispname + '</span></td>' +
+        '<td class="availability"><img src="' + img_src + '" class="availabilityicon ' + avail + '" data-email="' + data.email + '" alt="" /></td>' +
+        '<td class="confirmstate"><span class="' + status + '" title="' + Q(tooltip) + '">' + Q(status ? status_label : '') + '</span></td>' +
+        (data.cutype != 'RESOURCE' ? '<td class="invite">' + (organizer || readonly || !invbox ? '' : invbox) + '</td>' : '') +
+        '<td class="options">' + (organizer || readonly ? '' : dellink) + '</td>';
+
+      var table = rcmail.env.calendar_resources && data.cutype == 'RESOURCE' ? resources_list : attendees_list;
+      var tr = $('<tr>')
+        .addClass(String(data.role).toLowerCase())
+        .html(html);
+
+      if (before)
+        tr.insertBefore(before)
+      else
+        tr.appendTo(table);
+
+      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(event_attendee_click);
+      tr.find('a.expandlink').click(data, function(e) { me.expand_attendee_group(e, add_attendee, remove_attendee); return false; });
+      tr.find('input.edit-attendee-reply').click(function() {
+        var enabled = $('#edit-attendees-invite:checked').length || $('input.edit-attendee-reply:checked').length;
+        $('#eventedit .attendees-commentbox')[enabled ? 'show' : 'hide']();
+      });
+
+      // select organizer identity
+      if (data.identity_id)
+        $('#edit-identities-list').val(data.identity_id);
+      
+      // check free-busy status
+      if (avail == 'loading') {
+        check_freebusy_status(tr.find('img.availabilityicon'), data.email, me.selected_event);
+      }
+      
+      event_attendees.push(data);
+      return true;
+    };
+    
+    // iterate over all attendees and update their free-busy status display
+    var update_freebusy_status = function(event)
+    {
+      attendees_list.find('img.availabilityicon').each(function(i,v) {
+        var email, icon = $(this);
+        if (email = icon.attr('data-email'))
+          check_freebusy_status(icon, 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).attr('class', 'availabilityicon unknown');
+        return;
+      }
+      
+      icon = $(icon).attr('class', 'availabilityicon loading');
+      
+      $.ajax({
+        type: 'GET',
+        dataType: 'html',
+        url: rcmail.url('freebusy-status'),
+        data: { email:email, start:date2servertime(clone_date(event.start, event.allDay?1:0)), end:date2servertime(clone_date(event.end, event.allDay?2:0)), _remote: 1 },
+        success: function(status){
+          var avail = String(status).toLowerCase();
+          icon.removeClass('loading').addClass(avail).attr('alt', rcmail.gettext('avail' + avail, 'calendar'));
+        },
+        error: function(){
+          icon.removeClass('loading').addClass('unknown').attr('alt', rcmail.gettext('availunknown', 'calendar'));
+        }
+      });
+    };
+    
+    // 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) });
+    };
+
+    // open a dialog to display detailed free-busy information and to find free slots
+    var event_resources_dialog = function(search)
+    {
+      var $dialog = $('#eventresourcesdialog');
+
+      if ($dialog.is(':ui-dialog'))
+        $dialog.dialog('close');
+  
+      // dialog buttons
+      var buttons = {};
+  
+      buttons[rcmail.gettext('addresource', 'calendar')] = function() {
+        rcmail.command('add-resource');
+      };
+  
+      buttons[rcmail.gettext('close')] = function() {
+        $dialog.dialog("close");
+      };
+
+      // open jquery UI dialog
+      $dialog.dialog({
+        modal: true,
+        resizable: true,
+        closeOnEscape: true,
+        title: rcmail.gettext('findresources', 'calendar'),
+        open: function() {
+          rcmail.ksearch_blur();
+          $dialog.attr('aria-hidden', 'false');
+        },
+        close: function() {
+          $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
+        },
+        resize: function(e) {
+          var container = $(rcmail.gui_objects.resourceinfocalendar);
+          container.fullCalendar('option', 'height', container.height() + 4);
+        },
+        buttons: buttons,
+        width: 900,
+        height: 500
+      }).show();
+
+      // define add-button as main action
+      $('.ui-dialog-buttonset .ui-button', $dialog.parent()).first().addClass('mainaction').attr('id', 'rcmbtncalresadd');
+
+      me.dialog_resize($dialog.get(0), 540, Math.min(1000, $(window).width() - 50));
+
+      // set search query
+      $('#resourcesearchbox').val(search || '');
+
+      // initialize the treelist widget
+      if (!resources_treelist) {
+        resources_treelist = new rcube_treelist_widget(rcmail.gui_objects.resourceslist, {
+          id_prefix: 'rcres',
+          id_encode: rcmail.html_identifier_encode,
+          id_decode: rcmail.html_identifier_decode,
+          selectable: true,
+          save_state: true
+        });
+        resources_treelist.addEventListener('select', function(node) {
+          if (resources_data[node.id]) {
+            resource_showinfo(resources_data[node.id]);
+            rcmail.enable_command('add-resource', me.selected_event && $("#eventedit").is(':visible') ? true : false);
+          }
+          else {
+            rcmail.enable_command('add-resource', false);
+            $(rcmail.gui_objects.resourceinfo).hide();
+            $(rcmail.gui_objects.resourceownerinfo).hide();
+            $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('removeEventSource', resources_events_source);
+          }
+        });
+
+        // fetch (all) resource data from server
+        me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
+        rcmail.http_request('resources-list', {}, me.loading_lock);
+
+        // register button
+        rcmail.register_button('add-resource', 'rcmbtncalresadd', 'uibutton');
+
+        // initialize resource calendar display
+        var resource_cal = $(rcmail.gui_objects.resourceinfocalendar);
+        resource_cal.fullCalendar($.extend({}, fullcalendar_defaults, {
+          header: { left: '', center: '', right: '' },
+          height: resource_cal.height() + 4,
+          defaultView: 'agendaWeek',
+          eventSources: [],
+          slotMinutes: 60,
+          allDaySlot: false,
+          eventRender: function(event, element, view) {
+            var title = rcmail.get_label(event.status, 'calendar');
+            element.addClass('status-' + event.status);
+            element.find('.fc-event-head').hide();
+            element.find('.fc-event-title').text(title);
+            element.attr('aria-label', me.event_date_text(event, true) + ': ' + title);
+          }
+        }));
+
+        $('#resource-calendar-prev').click(function(){
+          resource_cal.fullCalendar('prev');
+          return false;
+        });
+        $('#resource-calendar-next').click(function(){
+          resource_cal.fullCalendar('next');
+          return false;
+        });
+      }
+      else if (search) {
+        resource_search();
+      }
+      else {
+        resource_render_list(resources_index);
+      }
+
+      if (me.selected_event && me.selected_event.start) {
+        $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('gotoDate', me.selected_event.start);
+      }
+    };
+
+    // render the resource details UI box
+    var resource_showinfo = function(resource)
+    {
+      // inline function to render a resource attribute
+      function render_attrib(value) {
+        if (typeof value == 'boolean') {
+          return value ? rcmail.get_label('yes') : rcmail.get_label('no');
+        }
+
+        return value;
+      }
+
+      if (rcmail.gui_objects.resourceinfo) {
+        var tr, table = $(rcmail.gui_objects.resourceinfo).show().find('tbody').html(''),
+          attribs = $.extend({ name:resource.name }, resource.attributes||{})
+          attribs.description = resource.description;
+
+        for (var k in attribs) {
+          if (typeof attribs[k] == 'undefined')
+            continue;
+          table.append($('<tr>').addClass(k)
+            .append('<td class="title">' + Q(ucfirst(rcmail.get_label(k, 'calendar'))) + '</td>')
+            .append('<td class="value">' + text2html(render_attrib(attribs[k])) + '</td>')
+          );
+        }
+
+        $(rcmail.gui_objects.resourceownerinfo).hide();
+        $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('removeEventSource', resources_events_source);
+
+        if (resource.owner) {
+          // display cached data
+          if (resource_owners[resource.owner]) {
+            resource_owner_load(resource_owners[resource.owner]);
+          }
+          else {
+            // fetch owner data from server
+            me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
+            rcmail.http_request('resources-owner', { _id: resource.owner }, me.loading_lock);
+          }
+        }
+
+        // load resource calendar
+        resources_events_source.url = "./?_task=calendar&_action=resources-calendar&_id="+urlencode(resource.ID);
+        $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('addEventSource', resources_events_source);
+      }
+    };
+
+    // callback from server for resource listing
+    var resource_data_load = function(data)
+    {
+      var resources_tree = {};
+
+      // store data by ID
+      $.each(data, function(i, rec) {
+        resources_data[rec.ID] = rec;
+
+        // assign parent-relations
+        if (rec.members) {
+          $.each(rec.members, function(j, m){
+            resources_tree[m] = rec.ID;
+          });
+        }
+      });
+
+      // walk the parent-child tree to determine the depth of each node
+      $.each(data, function(i, rec) {
+        rec._depth = 0;
+        if (resources_tree[rec.ID])
+          rec.parent_id = resources_tree[rec.ID];
+
+        var parent_id = resources_tree[rec.ID];
+        while (parent_id) {
+          rec._depth++;
+          parent_id = resources_tree[parent_id];
+        }
+      });
+
+      // sort by depth, collection and name
+      data.sort(function(a,b) {
+        var j = a._type == 'collection' ? 1 : 0,
+            k = b._type == 'collection' ? 1 : 0,
+            d = a._depth - b._depth;
+        if (!d) d = (k - j);
+        if (!d) d = b.name < a.name ? 1 : -1;
+        return d;
+      });
+
+      $.each(data, function(i, rec) {
+        resources_index.push(rec.ID);
+      });
+
+      // apply search filter...
+      if ($('#resourcesearchbox').val() != '')
+        resource_search();
+      else  // ...or render full list
+        resource_render_list(resources_index);
+
+      rcmail.set_busy(false, null, me.loading_lock);
+    };
+
+    // renders the given list of resource records into the treelist
+    var resource_render_list = function(index) {
+      var rec, link;
+
+      resources_treelist.reset();
+
+      $.each(index, function(i, dn) {
+        if (rec = resources_data[dn]) {
+          link = $('<a>').attr('href', '#')
+            .attr('rel', rec.ID)
+            .html(Q(rec.name));
+
+          resources_treelist.insert({ id:rec.ID, html:link, classes:[rec._type], collapsed:true }, rec.parent_id, false);
+        }
+      });
+    };
+
+    // callback from server for owner information display
+    var resource_owner_load = function(data)
+    {
+      if (data) {
+        // cache this!
+        resource_owners[data.ID] = data;
+
+        var table = $(rcmail.gui_objects.resourceownerinfo).find('tbody').html('');
+
+        for (var k in data) {
+          if (k == 'event' || k == 'ID')
+            continue;
+
+          table.append($('<tr>').addClass(k)
+            .append('<td class="title">' + Q(ucfirst(rcmail.get_label(k, 'calendar'))) + '</td>')
+            .append('<td class="value">' + text2html(data[k]) + '</td>')
+          );
+        }
+
+        table.parent().show();
+      }
+    }
+
+    // quick-filter the loaded resource data
+    var resource_search = function()
+    {
+      var dn, rec, dataset = [],
+        q = $('#resourcesearchbox').val().toLowerCase();
+
+      if (q.length && resources_data) {
+        // search by iterating over all resource records
+        for (dn in resources_data) {
+          rec = resources_data[dn];
+          if ((rec.name && String(rec.name).toLowerCase().indexOf(q) >= 0)
+            || (rec.email && String(rec.email).toLowerCase().indexOf(q) >= 0)
+            || (rec.description && String(rec.description).toLowerCase().indexOf(q) >= 0)
+          ) {
+            dataset.push(rec.ID);
+          }
+        }
+
+        resource_render_list(dataset);
+
+        // select single match
+        if (dataset.length == 1) {
+          resources_treelist.select(dataset[0]);
+        }
+      }
+      else {
+        $('#resourcesearchbox').val('');
+      }
+    };
+
+    // 
+    var reset_resource_search = function()
+    {
+      $('#resourcesearchbox').val('').focus();
+      resource_render_list(resources_index);
+    };
+
+    // 
+    var add_resource2event = function()
+    {
+      var resource = resources_data[resources_treelist.get_selection()];
+      if (resource) {
+        if (add_attendee($.extend({ role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' }, resource)))
+          rcmail.display_message(rcmail.get_label('resourceadded', 'calendar'), 'confirmation');
+      }
+    }
+
+    // when the user accepts or declines an event invitation
+    var event_rsvp = function(response, delegate, replymode)
+    {
+      var btn;
+      if (typeof response == 'object') {
+        btn = $(response);
+        response = btn.attr('rel')
+      }
+      else {
+        btn = $('#event-rsvp input.button[rel='+response+']');
+      }
+
+      // show menu to select rsvp reply mode (current or all)
+      if (me.selected_event && me.selected_event.recurrence && !replymode) {
+        rcube_libcalendaring.itip_rsvp_recurring(btn, function(resp, mode) {
+          event_rsvp(resp, null, mode);
+        });
+        return;
+      }
+
+      if (me.selected_event && me.selected_event.attendees && response) {
+        // bring up delegation dialog
+        if (response == 'delegated' && !delegate) {
+          rcube_libcalendaring.itip_delegate_dialog(function(data) {
+            data.rsvp = data.rsvp ? 1 : '';
+            event_rsvp('delegated', data, replymode);
+          });
+          return;
+        }
+
+        // update attendee status
+        attendees = [];
+        for (var data, i=0; i < me.selected_event.attendees.length; i++) {
+          data = me.selected_event.attendees[i];
+          if (settings.identity.emails.indexOf(';'+String(data.email).toLowerCase()) >= 0) {
+            data.status = response.toUpperCase();
+            data.rsvp = 0;  // unset RSVP flag
+
+            if (data.status == 'DELEGATED') {
+              data['delegated-to'] = delegate.to;
+              data.rsvp = delegate.rsvp
+            }
+            else {
+              if (data['delegated-to']) {
+                delete data['delegated-to'];
+                if (data.role == 'NON-PARTICIPANT' && data.status != 'DECLINED')
+                  data.role = 'REQ-PARTICIPANT';
+              }
+            }
+
+            attendees.push(i)
+          }
+          else if (response != 'DELEGATED' && data['delegated-from'] &&
+              settings.identity.emails.indexOf(';'+String(data['delegated-from']).toLowerCase()) >= 0) {
+            delete data['delegated-from'];
+          }
+
+          // set free_busy status to transparent if declined (#4425)
+          if (data.status == 'DECLINED' || data.role == 'NON-PARTICIPANT') {
+            me.selected_event.free_busy = 'free';
+          }
+          else {
+            me.selected_event.free_busy = 'busy';
+          }
+        }
+
+        // submit status change to server
+        var submit_data = $.extend({}, me.selected_event, { source:null, comment:$('#reply-comment-event-rsvp').val(), _savemode: replymode || 'all' }, (delegate || {})),
+          noreply = $('#noreply-event-rsvp:checked').length ? 1 : 0;
+
+        // import event from mail (temporary iTip event)
+        if (submit_data._mbox && submit_data._uid) {
+          me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
+          rcmail.http_post('mailimportitip', {
+            _mbox: submit_data._mbox,
+            _uid:  submit_data._uid,
+            _part: submit_data._part,
+            _status:  response,
+            _to: (delegate ? delegate.to : null),
+            _rsvp: (delegate && delegate.rsvp) ? 1 : 0,
+            _noreply: noreply,
+            _comment: submit_data.comment,
+            _instance: submit_data._instance,
+            _savemode: submit_data._savemode
+          });
+        }
+        else if (settings.invitation_calendars) {
+          update_event('rsvp', submit_data, { status:response, noreply:noreply, attendees:attendees });
+        }
+        else {
+          me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
+          rcmail.http_post('event', { action:'rsvp', e:submit_data, status:response, attendees:attendees, noreply:noreply });
+        }
+
+        event_show_dialog(me.selected_event);
+      }
+    };
+    
+    // add the given date to the RDATE list
+    var add_rdate = function(date)
+    {
+      var li = $('<li>')
+        .attr('data-value', date2servertime(date))
+        .html('<span>' + Q($.fullCalendar.formatDate(date, settings['date_format'])) + '</span>')
+        .appendTo('#edit-recurrence-rdates');
+
+      $('<a>').attr('href', '#del')
+        .addClass('iconbutton delete')
+        .html(rcmail.get_label('delete', 'calendar'))
+        .attr('title', rcmail.get_label('delete', 'calendar'))
+        .appendTo(li);
+    };
+
+    // re-sort the list items by their 'data-value' attribute
+    var sort_rdates = function()
+    {
+      var mylist = $('#edit-recurrence-rdates'),
+        listitems = mylist.children('li').get();
+      listitems.sort(function(a, b) {
+         var compA = $(a).attr('data-value');
+         var compB = $(b).attr('data-value');
+         return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
+      })
+      $.each(listitems, function(idx, item) { mylist.append(item); });
+    }
+
+    // remove the link reference matching the given uri
+    function remove_link(elem)
+    {
+      var $elem = $(elem), uri = $elem.attr('data-uri');
+
+      me.selected_event.links = $.grep(me.selected_event.links, function(link) { return link.uri != uri; });
+
+      // remove UI list item
+      $elem.hide().closest('li').addClass('deleted');
+    }
+
+    // post the given event data to server
+    var update_event = function(action, data, add)
+    {
+      me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
+      rcmail.http_post('calendar/event', $.extend({ action:action, e:data }, (add || {})));
+      
+      // render event temporarily into the calendar
+      if ((data.start && data.end) || data.id) {
+        var event = data.id ? $.extend(fc.fullCalendar('clientEvents', function(e){ return e.id == data.id; })[0], data) : data;
+        if (data.start)
+          event.start = data.start;
+        if (data.end)
+          event.end = data.end;
+        if (data.allday !== undefined)
+          event.allDay = data.allday;
+        event.editable = false;
+        event.temp = true;
+        event.className = 'fc-event-cal-'+data.calendar+' fc-event-temp';
+        fc.fullCalendar(data.id ? 'updateEvent' : 'renderEvent', event);
+
+        // mark all recurring instances as temp
+        if (event.recurrence || event.recurrence_id) {
+          var base_id = event.recurrence_id ? event.recurrence_id : String(event.id).replace(/-\d+(T\d{6})?$/, '');
+          $.each(fc.fullCalendar('clientEvents', function(e){ return e.id == base_id || e.recurrence_id == base_id; }), function(i,ev) {
+            ev.temp = true;
+            ev.editable = false;
+            event.className += ' fc-event-temp';
+            fc.fullCalendar('updateEvent', ev);
+          });
+        }
+      }
+    };
+
+    // 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 && !$(e.target).closest('.popupmenu').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)
+    {
+      // Allow other plugins to do actions here
+      // E.g. when you move/resize the event init wasn't called
+      // but we need it as some plugins may modify user identities
+      // we depend on here (kolab_delegation)
+      rcmail.triggerEvent('calendar-event-init', {o: event});
+
+      if (!data) data = event;
+      var decline = false, notify = false, html = '', cal = me.calendars[event.calendar],
+        _has_attendees = me.has_attendees(event),
+        _is_attendee = _has_attendees && me.is_attendee(event),
+        _is_organizer = me.is_organizer(event);
+
+      // event has attendees, ask whether to notify them
+      if (_has_attendees) {
+        var checked = (settings.itip_notify & 1 ? ' checked="checked"' : '');
+
+        if (action == 'remove' && cal.group != 'shared' && !_is_organizer && _is_attendee) {
+          decline = true;
+          checked = event.status != 'CANCELLED' ? checked : '';
+          html += '<div class="message">' +
+            '<label><input class="confirm-attendees-decline" type="checkbox"' + checked + ' value="1" name="decline" />&nbsp;' +
+            rcmail.gettext('itipdeclineevent', 'calendar') + 
+            '</label></div>';
+        }
+        else if (_is_organizer) {
+          notify = true;
+          if (settings.itip_notify & 2) {
+            html += '<div class="message">' +
+              '<label><input class="confirm-attendees-donotify" type="checkbox"' + checked + ' value="1" name="notify" />&nbsp;' +
+                rcmail.gettext((action == 'remove' ? 'sendcancellation' : 'sendnotifications'), 'calendar') +
+              '</label></div>';
+          }
+          else {
+            data._notify = settings.itip_notify;
+          }
+        }
+      }
+
+      // recurring event: user needs to select the savemode
+      if (event.recurrence) {
+        var future_disabled = '', message_label = (action == 'remove' ? 'removerecurringeventwarning' : 'changerecurringeventwarning');
+
+        // disable the 'future' savemode if I'm an attendee
+        // reason: no calendaring system supports the thisandfuture range parameter in iTip REPLY
+        if (action == 'remove' && !_is_organizer && _is_attendee) {
+          future_disabled = ' disabled';
+        }
+
+        html += '<div class="message"><span class="ui-icon ui-icon-alert"></span>' +
+          rcmail.gettext(message_label, 'calendar') + '</div>' +
+          '<div class="savemode">' +
+            '<a href="#current" class="button">' + rcmail.gettext('currentevent', 'calendar') + '</a>' +
+            '<a href="#future" class="button' + future_disabled + '">' + 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);
+      
+        $dialog.find('a.button').button().filter(':not(.disabled)').click(function(e) {
+          data._savemode = String(this.href).replace(/.+#/, '');
+          data._notify = settings.itip_notify;
+
+          // open event edit dialog when saving as new
+          if (data._savemode == 'new') {
+            event._savemode = 'new';
+            event_edit_dialog('edit', event);
+            fc.fullCalendar('refetchEvents');
+          }
+          else {
+            if ($dialog.find('input.confirm-attendees-donotify').length)
+              data._notify = $dialog.find('input.confirm-attendees-donotify').get(0).checked ? 1 : 0;
+            if (decline) {
+              data._decline = $dialog.find('input.confirm-attendees-decline:checked').length;
+              data._notify = 0;
+            }
+            update_event(action, data);
+          }
+
+          $dialog.dialog("close");
+          return false;
+        });
+        
+        var buttons = [];
+
+        if (!event.recurrence) {
+          buttons.push({
+            text: rcmail.gettext((action == 'remove' ? 'delete' : 'save'), 'calendar'),
+            click: function() {
+              data._notify = notify && $dialog.find('input.confirm-attendees-donotify:checked').length ? 1 : 0;
+              data._decline = decline && $dialog.find('input.confirm-attendees-decline:checked').length ? 1 : 0;
+              update_event(action, data);
+              $(this).dialog("close");
+            }
+          });
+        }
+
+        buttons.push({
+          text: rcmail.gettext('cancel', 'calendar'),
+          click: function() {
+            $(this).dialog("close");
+          }
+        });
+
+        $dialog.dialog({
+          modal: true,
+          width: 460,
+          dialogClass: 'warning',
+          title: rcmail.gettext((action == 'remove' ? 'removeeventconfirm' : 'changeeventconfirm'), 'calendar'),
+          buttons: buttons,
+          open: function() {
+            setTimeout(function(){
+              $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
+            }, 5);
+          },
+          close: function(){
+            $dialog.dialog("destroy").remove();
+            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'));
+    }
+
+
+    /*** public methods ***/
+
+    /**
+     * Remove saving lock and free the UI for new input
+     */
+    this.unlock_saving = function()
+    {
+        if (me.saving_lock)
+            rcmail.set_busy(false, null, me.saving_lock);
+    };
+
+    // opens calendar day-view in a popup
+    this.fisheye_view = function(date)
+    {
+      $('#fish-eye-view:ui-dialog').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: $.fullCalendar.formatDate(date, 'dddd ' + settings['date_long']),
+          close: function(){
+            dialog.dialog("destroy");
+            me.fisheye_date = null;
+          }
+        })
+        .fullCalendar($.extend({}, fullcalendar_defaults, {
+          defaultView: 'agendaDay',
+          header: { left: '', center: '', right: '' },
+          height: h - 50,
+          date: date.getDate(),
+          month: date.getMonth(),
+          year: date.getFullYear(),
+          eventSources: sources
+        }));
+        
+        this.fisheye_date = date;
+    };
+
+    // opens the given calendar in a popup dialog
+    this.quickview = function(id, shift)
+    {
+      var src, in_quickview = false;
+      $.each(this.quickview_sources, function(i,cal) {
+        if (cal.id == id) {
+          in_quickview = true;
+          src = cal;
+        }
+      });
+
+      // remove source from quickview
+      if (in_quickview && shift) {
+        this.quickview_sources = $.grep(this.quickview_sources, function(src) { return src.id != id; });
+      }
+      else {
+        if (!shift) {
+          // remove all current quickview event sources
+          if (this.quickview_active) {
+            fc.fullCalendar('removeEventSources');
+          }
+
+          this.quickview_sources = [];
+
+          // uncheck all active quickview icons
+          calendars_list.container.find('div.focusview')
+            .add('#calendars .searchresults div.focusview')
+            .removeClass('focusview')
+              .find('a.quickview').attr('aria-checked', 'false');
+        }
+
+        if (!in_quickview) {
+          // clone and modify calendar properties
+          src = $.extend({}, this.calendars[id]);
+          src.url += '&_quickview=1';
+          this.quickview_sources.push(src);
+        }
+      }
+
+      // disable quickview
+      if (this.quickview_active && !this.quickview_sources.length) {
+        // register regular calendar event sources
+        $.each(this.calendars, function(k, cal) {
+          if (cal.active)
+            fc.fullCalendar('addEventSource', cal);
+        });
+
+        this.quickview_active = false;
+        $('body').removeClass('quickview-active');
+
+        // uncheck all active quickview icons
+        calendars_list.container.find('div.focusview')
+          .add('#calendars .searchresults div.focusview')
+          .removeClass('focusview')
+            .find('a.quickview').attr('aria-checked', 'false');
+      }
+      // activate quickview
+      else if (!this.quickview_active) {
+        // remove regular calendar event sources
+        fc.fullCalendar('removeEventSources');
+
+        // register quickview event sources
+        $.each(this.quickview_sources, function(i, src) {
+          fc.fullCalendar('addEventSource', src);
+        });
+
+        this.quickview_active = true;
+        $('body').addClass('quickview-active');
+      }
+      // update quickview sources
+      else if (in_quickview) {
+        fc.fullCalendar('removeEventSource', src);
+      }
+      else if (src) {
+        fc.fullCalendar('addEventSource', src);
+      }
+
+      // activate quickview icon
+      if (this.quickview_active) {
+        $(calendars_list.get_item(id)).find('.calendar').first()
+          .add('#calendars .searchresults .cal-' + id)
+          [in_quickview ? 'removeClass' : 'addClass']('focusview')
+            .find('a.quickview').attr('aria-checked', in_quickview ? 'false' : 'true');
+      }
+    };
+
+    // disable quickview mode
+    function reset_quickview()
+    {
+      // remove all current quickview event sources
+      if (me.quickview_active) {
+        fc.fullCalendar('removeEventSources');
+        me.quickview_sources = [];
+      }
+
+      // register regular calendar event sources
+      $.each(me.calendars, function(k, cal) {
+        if (cal.active)
+          fc.fullCalendar('addEventSource', cal);
+      });
+
+      // uncheck all active quickview icons
+      calendars_list.container.find('div.focusview')
+        .add('#calendars .searchresults div.focusview')
+        .removeClass('focusview')
+          .find('a.quickview').attr('aria-checked', 'false');
+
+      me.quickview_active = false;
+      $('body').removeClass('quickview-active');
+    };
+
+    //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');
+      rcmail.open_window(rcmail.url('print', { view: view, date: date2unixtime(date), range: range, sections: sections, search: this.search_query }), true, true);
+    };
+
+    // 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 = $("#calendarform");
+      if ($dialog.is(':ui-dialog'))
+        $dialog.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'),
+        open: function() {
+          $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
+        },
+        close: function() {
+          $dialog.html('').dialog("destroy").hide();
+        },
+        buttons: buttons,
+        minWidth: 400,
+        width: 420
+      }).show();
+
+    };
+
+    this.calendar_remove = function(calendar)
+    {
+      this.calendar_destroy_source(calendar.id);
+      rcmail.http_post('calendar', { action:'subscribe', c:{ id:calendar.id, active:0, permanent:0, recursive:1 } });
+      return true;
+    };
+
+    this.calendar_delete = function(calendar)
+    {
+      if (confirm(rcmail.gettext(calendar.children ? 'deletecalendarconfirmrecursive' : 'deletecalendarconfirm', 'calendar'))) {
+        rcmail.http_post('calendar', { action:'delete', c:{ id:calendar.id } });
+        return true;
+      }
+      return false;
+    };
+
+    this.calendar_refresh_source = function(id)
+    {
+      // got race-conditions fc.currentFetchID when using refetchEvents,
+      // so we remove and add the source instead
+      // fc.fullCalendar('refetchEvents', me.calendars[id]);
+      fc.fullCalendar('removeEventSource', me.calendars[id]);
+      fc.fullCalendar('addEventSource', me.calendars[id]);
+    };
+
+    this.calendar_destroy_source = function(id)
+    {
+      var delete_ids = [];
+
+      if (this.calendars[id]) {
+        // find sub-calendars
+        if (this.calendars[id].children) {
+          for (var child_id in this.calendars) {
+            if (String(child_id).indexOf(id) == 0)
+              delete_ids.push(child_id);
+          }
+        }
+        else {
+          delete_ids.push(id);
+        }
+      }
+
+      // delete all calendars in the list
+      for (var i=0; i < delete_ids.length; i++) {
+        id = delete_ids[i];
+        calendars_list.remove(id);
+        fc.fullCalendar('removeEventSource', this.calendars[id]);
+        $('#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 = $("#eventsimport"),
+        form = rcmail.gui_objects.importform;
+      
+      if ($dialog.is(':ui-dialog'))
+        $dialog.dialog('close');
+      
+      if (calendar)
+        $('#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);
+            $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
+
+            // display error message if no sophisticated response from server arrived (e.g. iframe load error)
+            if (me.import_succeeded === null)
+              rcmail.display_message(rcmail.get_label('importerror', 'calendar'), 'error');
+          });
+
+          // display upload indicator (with extended timeout)
+          var timeout = rcmail.env.request_timeout;
+          rcmail.env.request_timeout = 600;
+          me.import_succeeded = null;
+          me.saving_lock = rcmail.set_busy(true, 'uploading');
+          $('.ui-dialog-buttonpane button', $dialog.parent()).button('disable');
+
+          // restore settings
+          rcmail.env.request_timeout = timeout;
+        }
+      };
+
+      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'),
+        open: function() {
+          $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
+        },
+        close: function() {
+          $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
+          $dialog.dialog("destroy").hide();
+        },
+        buttons: buttons,
+        width: 520
+      }).show();
+    };
+
+    // callback from server if import succeeded
+    this.import_success = function(p)
+    {
+      this.import_succeeded = true;
+      $("#eventsimport:ui-dialog").dialog('close');
+      rcmail.set_busy(false, null, me.saving_lock);
+      rcmail.gui_objects.importform.reset();
+
+      if (p.refetch)
+        this.refresh(p);
+    };
+
+    // callback from server to report errors on import
+    this.import_error = function(p)
+    {
+      this.import_succeeded = false;
+      rcmail.set_busy(false, null, me.saving_lock);
+      rcmail.display_message(p.message || rcmail.get_label('importerror', 'calendar'), 'error');
+    }
+
+    // open a dialog to select calendars for export
+    this.export_events = function(calendar)
+    {
+      // close show dialog first
+      var $dialog = $("#eventsexport"),
+        form = rcmail.gui_objects.exportform;
+
+      if ($dialog.is(':ui-dialog'))
+        $dialog.dialog('close');
+
+      if (calendar)
+        $('#event-export-calendar').val(calendar.id);
+
+      $('#event-export-range').change(function(e){
+        var custom = $('option:selected', this).val() == 'custom',
+          input = $('#event-export-startdate')
+        input.parent()[(custom?'show':'hide')]();
+        if (custom)
+          input.select();
+      })
+
+      var buttons = {};
+      buttons[rcmail.gettext('export', 'calendar')] = function() {
+        if (form) {
+          var start = 0, range = $('#event-export-range option:selected', this).val(),
+            source = $('#event-export-calendar option:selected').val(),
+            attachmt = $('#event-export-attachments').get(0).checked;
+
+          if (range == 'custom')
+            start = date2unixtime(parse_datetime('00:00', $('#event-export-startdate').val()));
+          else if (range > 0)
+            start = 'today -' + range + ' months';
+
+          rcmail.goto_url('export_events', { source:source, start:start, attachments:attachmt?1:0 });
+        }
+        $dialog.dialog("close");
+      };
+
+      buttons[rcmail.gettext('cancel', 'calendar')] = function() {
+        $dialog.dialog("close");
+      };
+
+      // open jquery UI dialog
+      $dialog.dialog({
+        modal: true,
+        resizable: false,
+        closeOnEscape: false,
+        title: rcmail.gettext('exporttitle', 'calendar'),
+        open: function() {
+          $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
+        },
+        close: function() {
+          $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
+          $dialog.dialog("destroy").hide();
+        },
+        buttons: buttons,
+        width: 520
+      }).show();
+    };
+
+    // download the selected event as iCal
+    this.event_download = function(event)
+    {
+      if (event && event.id) {
+        rcmail.goto_url('export_events', { source:event.calendar, id:event.id, attachments:1 });
+      }
+    };
+
+    // open the message compose step with a calendar_event parameter referencing the selected event.
+    // the server-side plugin hook will pick that up and attach the event to the message.
+    this.event_sendbymail = function(event, e)
+    {
+      if (event && event.id) {
+        rcmail.command('compose', { _calendar_event:event._id }, e ? e.target : null, e);
+      }
+    };
+
+    // display the edit dialog, request 'new' action and pass the selected event
+    this.event_copy = function(event) {
+      if (event && event.id) {
+        var copy = $.extend(true, {}, event);
+
+        delete copy.id;
+        delete copy._id;
+        delete copy.created;
+        delete copy.changed;
+        delete copy.recurrence_id;
+        delete copy.attachments; // @TODO
+
+        $.each(copy.attendees, function (k, v) {
+          if (v.role != 'ORGANIZER') {
+            v.status = 'NEEDS-ACTION';
+          }
+        })
+
+        event_edit_dialog('new', copy);
+      }
+    };
+
+    // show URL of the given calendar in a dialog box
+    this.showurl = function(calendar)
+    {
+      var $dialog = $('#calendarurlbox');
+
+      if ($dialog.is(':ui-dialog'))
+        $dialog.dialog('close');
+
+      if (calendar.feedurl) {
+        if (calendar.caldavurl) {
+          $('#caldavurl').val(calendar.caldavurl);
+          $('#calendarcaldavurl').show();
+        }
+        else {
+          $('#calendarcaldavurl').hide();
+        }
+
+        $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];
+
+      // helper function to update the given fullcalendar view
+      function update_view(view, event, source) {
+        var existing = view.fullCalendar('clientEvents', event._id);
+        if (existing.length) {
+          $.extend(existing[0], event);
+          view.fullCalendar('updateEvent', existing[0]);
+          // remove old recurrence instances
+          if (event.recurrence && !event.recurrence_id)
+            view.fullCalendar('removeEvents', function(e){ return e._id.indexOf(event._id+'-') == 0; });
+        }
+        else {
+          event.source = source;  // link with source
+          view.fullCalendar('renderEvent', event);
+        }
+      }
+
+      // remove temp events
+      fc.fullCalendar('removeEvents', function(e){ return e.temp; });
+
+      if (source && (p.refetch || (p.update && !source.active))) {
+        // activate event source if new event was added to an invisible calendar
+        if (this.quickview_active) {
+          // map source to the quickview_sources equivalent
+          $.each(this.quickview_sources, function(src) {
+            if (src.id == source.id) {
+              source = src;
+              return false;
+            }
+          });
+          fc.fullCalendar('refetchEvents', source, true);
+        }
+        else if (!source.active) {
+          source.active = true;
+          fc.fullCalendar('addEventSource', source);
+          $('#rcmlical' + source.id + ' input').prop('checked', true);
+        }
+        else
+          fc.fullCalendar('refetchEvents', source, true);
+
+        fetch_counts();
+      }
+      // add/update single event object
+      else if (source && p.update) {
+        var event = p.update;
+        event.temp = false;
+        event.editable = 0;
+
+          // update fish-eye view
+        if (this.fisheye_date)
+          update_view($('#fish-eye-view'), event, source);
+
+        // update main view
+        event.editable = source.editable;
+        update_view(fc, event, source);
+
+        // update the currently displayed event dialog
+        if ($('#eventshow').is(':visible') && me.selected_event && me.selected_event.id == event.id)
+          event_show_dialog(event)
+      }
+      // refetch all calendars
+      else if (p.refetch) {
+        fc.fullCalendar('refetchEvents', undefined, true);
+        fetch_counts();
+      }
+    };
+
+    // modify query parameters for refresh requests
+    this.before_refresh = function(query)
+    {
+      var view = fc.fullCalendar('getView');
+
+      query.start = date2unixtime(view.visStart);
+      query.end = date2unixtime(view.visEnd);
+
+      if (this.search_query)
+        query.q = this.search_query;
+
+      return query;
+    };
+
+    // callback from server providing event counts
+    this.update_counts = function(p)
+    {
+      $.each(p.counts, function(cal, count) {
+        var li = calendars_list.get_item(cal),
+          bubble = $(li).children('.calendar').find('span.count');
+
+        if (!bubble.length && count > 0) {
+          bubble = $('<span>')
+            .addClass('count')
+            .appendTo($(li).children('.calendar').first())
+        }
+
+        if (count > 0) {
+          bubble.text(count).show();
+        }
+        else {
+          bubble.text('').hide();
+        }
+      });
+    };
+
+    // callback after an iTip message event was imported
+    this.itip_message_processed = function(data)
+    {
+      // remove temporary iTip source
+      fc.fullCalendar('removeEventSource', this.calendars['--invitation--itip']);
+
+      $('#eventshow:ui-dialog').dialog('close');
+      this.selected_event = null;
+
+      // refresh destination calendar source
+      this.refresh({ source:data.calendar, refetch:true });
+
+      this.unlock_saving();
+
+      // process 'after_action' in mail task
+      if (window.opener && window.opener.rcube_libcalendaring)
+        window.opener.rcube_libcalendaring.itip_message_processed(data);
+    };
+
+    // reload the calendar view by keeping the current date/view selection
+    this.reload_view = function()
+    {
+      var query = { view: fc.fullCalendar('getView').name },
+        date = fc.fullCalendar('getDate');
+      if (date)
+        query.date = date2unixtime(date);
+      rcmail.redirect(rcmail.url('', query));
+    }
+
+    // update browser location to remember current view
+    this.update_state = function()
+    {
+      var query = { view: current_view },
+        date = fc.fullCalendar('getDate');
+      if (date)
+        query.date = date2unixtime(date);
+
+      if (window.history.replaceState)
+        window.history.replaceState({}, document.title, rcmail.url('', query).replace('&_action=', ''));
+    };
+
+    this.resource_search = resource_search;
+    this.reset_resource_search = reset_resource_search;
+    this.add_resource2event = add_resource2event;
+    this.resource_data_load = resource_data_load;
+    this.resource_owner_load = resource_owner_load;
+
+
+    /***  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 (me.quickview_active)
+            reset_quickview();
+          
+          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=' + urlencode(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);
+    };
+
+    // 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);
+    };
+
+    // mark the given calendar folder as selected
+    this.select_calendar = function(id, nolistupdate)
+    {
+      if (!nolistupdate)
+        calendars_list.select(id);
+
+      // trigger event hook
+      rcmail.triggerEvent('selectfolder', { folder:id, prefix:'rcmlical' });
+
+      this.selected_calendar = id;
+
+      rcmail.update_state({source: id});
+    };
+
+    // register the given calendar to the current view
+    var add_calendar_source = function(cal)
+    {
+      var color, brightness, select, id = cal.id;
+
+      me.calendars[id] = $.extend({
+        url: rcmail.url('calendar/load_events', { source: id }),
+        className: 'fc-event-cal-'+id,
+        id: id
+      }, cal);
+
+      // choose black text color when background is bright, white otherwise
+      if (color = settings.event_coloring % 2  ? '' : '#' + cal.color) {
+        if (/^#([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.test(color)) {
+          // use information about brightness calculation found at
+          // http://javascriptrules.com/2009/08/05/css-color-brightness-contrast-using-javascript/
+          brightness = (parseInt(RegExp.$1, 16) * 299 + parseInt(RegExp.$2, 16) * 587 + parseInt(RegExp.$3, 16) * 114) / 1000;
+          if (brightness > 125)
+            me.calendars[id].textColor = 'black';
+        }
+
+        me.calendars[id].color = color;
+      }
+
+      if (fc && (cal.active || cal.subscribed)) {
+        if (cal.active)
+          fc.fullCalendar('addEventSource', me.calendars[id]);
+
+        var submit = { id: id, active: cal.active ? 1 : 0 };
+        if (cal.subscribed !== undefined)
+            submit.permanent = cal.subscribed ? 1 : 0;
+        rcmail.http_post('calendar', { action:'subscribe', c:submit });
+      }
+
+      // insert to #calendar-select options if writeable
+      select = $('#edit-calendar');
+      if (fc && me.has_permission(cal, 'i') && select.length && !select.find('option[value="'+id+'"]').length) {
+        $('<option>').attr('value', id).html(cal.name).appendTo(select);
+      }
+    }
+
+    // fetch counts for some calendars from the server
+    var fetch_counts = function()
+    {
+      if (count_sources.length) {
+        setTimeout(function() {
+          rcmail.http_request('calendar/count', { source:count_sources });
+        }, 500);
+      }
+    };
+
+
+    /***  startup code  ***/
+
+    // create list of event sources AKA calendars
+    var id, cal, active, event_sources = [];
+    for (id in rcmail.env.calendars) {
+      cal = rcmail.env.calendars[id];
+      active = cal.active || false;
+      add_calendar_source(cal);
+
+      // check active calendars
+      $('#rcmlical'+id+' > .calendar input').prop('checked', active);
+
+      if (active) {
+        event_sources.push(this.calendars[id]);
+      }
+      if (cal.counts) {
+        count_sources.push(id);
+      }
+
+      if (cal.editable && !this.selected_calendar) {
+        this.selected_calendar = id;
+        rcmail.enable_command('addevent', true);
+      }
+    }
+
+    // initialize treelist widget that controls the calendars list
+    var widget_class = window.kolab_folderlist || rcube_treelist_widget;
+    calendars_list = new widget_class(rcmail.gui_objects.calendarslist, {
+      id_prefix: 'rcmlical',
+      selectable: true,
+      save_state: true,
+      keyboard: false,
+      searchbox: '#calendarlistsearch',
+      search_action: 'calendar/calendar',
+      search_sources: [ 'folders', 'users' ],
+      search_title: rcmail.gettext('calsearchresults','calendar')
+    });
+    calendars_list.addEventListener('select', function(node) {
+      if (node && node.id && me.calendars[node.id]) {
+        me.select_calendar(node.id, true);
+        rcmail.enable_command('calendar-edit', 'calendar-showurl', true);
+        rcmail.enable_command('calendar-delete', me.calendars[node.id].editable);
+        rcmail.enable_command('calendar-remove', me.calendars[node.id] && me.calendars[node.id].removable);
+      }
+    });
+    calendars_list.addEventListener('insert-item', function(p) {
+      var cal = p.data;
+      if (cal && cal.id) {
+        add_calendar_source(cal);
+
+        // add css classes related to this calendar to document
+        if (cal.css) {
+          $('<style type="text/css"></style>')
+            .html(cal.css)
+            .appendTo('head');
+        }
+      }
+    });
+    calendars_list.addEventListener('subscribe', function(p) {
+      var cal;
+      if ((cal = me.calendars[p.id])) {
+        cal.subscribed = p.subscribed || false;
+        rcmail.http_post('calendar', { action:'subscribe', c:{ id:p.id, active:cal.active?1:0, permanent:cal.subscribed?1:0 } });
+      }
+    });
+    calendars_list.addEventListener('remove', function(p) {
+      if (me.calendars[p.id] && me.calendars[p.id].removable) {
+        me.calendar_remove(me.calendars[p.id]);
+      }
+    });
+    calendars_list.addEventListener('search-complete', function(data) {
+      if (data.length)
+        rcmail.display_message(rcmail.gettext('nrcalendarsfound','calendar').replace('$nr', data.length), 'voice');
+      else
+        rcmail.display_message(rcmail.gettext('nocalendarsfound','calendar'), 'info');
+    });
+    calendars_list.addEventListener('click-item', function(event) {
+      // handle clicks on quickview icon: temprarily add this source and open in quickview
+      if ($(event.target).hasClass('quickview') && event.data) {
+        if (!me.calendars[event.data.id]) {
+          event.data.readonly = true;
+          event.data.active = false;
+          event.data.subscribed = false;
+          add_calendar_source(event.data);
+        }
+        me.quickview(event.data.id, event.shiftKey || event.metaKey || event.ctrlKey);
+        return false;
+      }
+    });
+
+    // init (delegate) event handler on calendar list checkboxes
+    $(rcmail.gui_objects.calendarslist).on('click', 'input[type=checkbox]', function(e) {
+      e.stopPropagation();
+
+      if (me.quickview_active) {
+        this.checked = !this.checked;
+        return false;
+      }
+
+      var id = this.value;
+      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;
+        }
+
+        // adjust checked state of original list item
+        if (calendars_list.is_search()) {
+          calendars_list.container.find('input[value="'+id+'"]').prop('checked', this.checked);
+        }
+
+        // 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 } });
+      }
+    })
+    .on('keypress', 'input[type=checkbox]', function(e) {
+        // select calendar on <Enter>
+        if (e.keyCode == 13) {
+            calendars_list.select(this.value);
+            return rcube_event.cancel(e);
+        }
+    })
+    // init (delegate) event handler on quickview links
+    .on('click', 'a.quickview', function(e) {
+      var id = $(this).closest('li').attr('id').replace(/^rcmlical/, '');
+
+      if (calendars_list.is_search())
+        id = id.replace(/--xsR$/, '');
+
+      if (me.calendars[id])
+        me.quickview(id, e.shiftKey || e.metaKey || e.ctrlKey);
+
+      if (!rcube_event.is_keyboard(e) && this.blur)
+        this.blur();
+
+      e.stopPropagation();
+      return false;
+    });
+
+    // register dbl-click handler to open calendar edit dialog
+    $(rcmail.gui_objects.calendarslist).on('dblclick', ':not(.virtual) > .calname', function(e){
+      var id = $(this).closest('li').attr('id').replace(/^rcmlical/, '');
+      me.calendar_edit_dialog(me.calendars[id]);
+    });
+
+    // select default calendar
+    if (rcmail.env.source && this.calendars[rcmail.env.source])
+      this.selected_calendar = rcmail.env.source;
+    else if (settings.default_calendar && this.calendars[settings.default_calendar] && this.calendars[settings.default_calendar].editable)
+      this.selected_calendar = settings.default_calendar;
+    
+    if (this.selected_calendar)
+      this.select_calendar(this.selected_calendar);
+    
+    var viewdate = new Date();
+    if (rcmail.env.date)
+      viewdate.setTime(fromunixtime(rcmail.env.date));
+
+    // add source with iTip event data for rendering
+    if (rcmail.env.itip_events && rcmail.env.itip_events.length) {
+      me.calendars['--invitation--itip'] = {
+        events: rcmail.env.itip_events,
+        className: 'fc-event-cal---invitation--itip',
+        color: '#fff',
+        textColor: '#333',
+        editable: false,
+        rights: 'lrs',
+        attendees: true
+      };
+      event_sources.push(me.calendars['--invitation--itip']);
+    }
+
+    // initalize the fullCalendar plugin
+    var fc = $('#calendar').fullCalendar($.extend({}, fullcalendar_defaults, {
+      header: {
+        right: 'prev,next today',
+        center: 'title',
+        left: 'agendaDay,agendaWeek,month,table'
+      },
+      date: viewdate.getDate(),
+      month: viewdate.getMonth(),
+      year: viewdate.getFullYear(),
+      height: $('#calendar').height(),
+      eventSources: event_sources,
+      selectable: true,
+      selectHelper: false,
+      loading: function(isLoading) {
+        me.is_loading = isLoading;
+        this._rc_loading = rcmail.set_busy(isLoading, 'loading', this._rc_loading);
+        // trigger callback
+        if (!isLoading)
+          me.events_loaded($(this).fullCalendar('clientEvents').length);
+      },
+      // 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 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) {
+          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) {
+          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: date2servertime(event.start),
+          end: date2servertime(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: date2servertime(event.start),
+          end: date2servertime(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;
+          me.update_state();
+        }
+      },
+      viewRender: function(view) {
+        if (fc && view.name == 'month')
+          fc.fullCalendar('option', 'maxHeight', Math.floor((view.element.parent().height()-18) / 6) - 35);
+      }
+    }));
+
+    // 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();
+    };
+
+    // Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
+    // Uses the default $.datepicker.iso8601Week() function but takes firstDay setting into account.
+    // This is a temporary fix until http://bugs.jqueryui.com/ticket/8420 is resolved.
+    var iso8601Week = datepicker_settings.calculateWeek = function(date) {
+      var mondayOffset = Math.abs(1 - datepicker_settings.firstDay);
+      return $.datepicker.iso8601Week(new Date(date.getTime() + mondayOffset * 86400000));
+    };
+
+    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: true,
+        changeYear: true,
+        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
+        .on('click', 'td.ui-datepicker-week-col', function(e) {
+          var cell = $(e.target);
+          if (e.target.tagName == 'TD') {
+            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);
+            base_date.setDate(base_date.getDate() - ((base_date.getDay() + 6) % 7) + datepicker_settings.firstDay);
+            var base_kw = iso8601Week(base_date),
+              target_kw = parseInt(cell.html()),
+              wdiff = target_kw - base_kw;
+            if (wdiff > 10)  // year jump
+              base_date.setYear(base_date.getFullYear() - 1);
+            else if (wdiff < -10)
+              base_date.setYear(base_date.getFullYear() + 1);
+            // select monday of the chosen calendar week
+            var day_off = base_date.getDay() - datepicker_settings.firstDay,
+              date = new Date(base_date.getTime() - day_off * DAY_MS + wdiff * 7 * DAY_MS);
+            fc.fullCalendar('gotoDate', date).fullCalendar('setDate', date).fullCalendar('changeView', 'agendaWeek');
+            minical.datepicker('setDate', date);
+          }
+        });
+
+      minical.find('.ui-datepicker-inline').attr('aria-labelledby', 'aria-label-minical');
+
+      if (rcmail.env.date) {
+        var viewdate = new Date();
+        viewdate.setTime(fromunixtime(rcmail.env.date));
+        minical.datepicker('setDate', viewdate);
+      }
+
+      // init event dialog
+      $('#eventtabs').tabs({
+        activate: function(event, ui) {
+          // newPanel.selector for jQuery-UI 1.10, newPanel.attr('id') for jQuery-UI 1.12
+          var tab = String(ui.newPanel.selector || ui.newPanel.attr('id'))
+              .replace(/^#?event-panel-/, '').replace(/s$/, '');
+
+          var has_real_attendee = function(attendees) {
+              for (var i=0; i < (attendees ? attendees.length : 0); i++) {
+                if (attendees[i].cutype != 'RESOURCE')
+                  return true;
+              }
+            };
+
+          if (tab == 'attendee' || tab == 'resource') {
+            if (!rcube_event.is_keyboard(event))
+              $('#edit-'+tab+'-name').select();
+            // update free-busy status if needed
+            if (freebusy_ui.needsupdate && me.selected_event)
+              update_freebusy_status(me.selected_event);
+            // add current user as organizer if non added yet
+            if (tab == 'attendee' && !has_real_attendee(event_attendees)) {
+              add_attendee($.extend({ role:'ORGANIZER' }, settings.identity));
+              $('#edit-attendees-form .attendees-invitebox').show();
+            }
+          }
+          // reset autocompletion on tab change (#3389)
+          rcmail.ksearch_blur();
+        }
+      });
+      $('#edit-enddate').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, #eventedit input.edit-alarm-time').each(function() {
+        me.init_time_autocomplete(this, {
+          container: '#eventedit',
+          change: event_times_changed
+        });
+      });
+
+      // adjust end time when changing start
+      $('#edit-starttime').change(function(e) {
+        var dstart = $('#edit-startdate'),
+          newstart = parse_datetime(this.value, dstart.val()),
+          newend = new Date(newstart.getTime() + dstart.data('duration') * 1000);
+        $('#edit-endtime').val($.fullCalendar.formatDate(newend, me.settings['time_format']));
+        $('#edit-enddate').val($.fullCalendar.formatDate(newend, me.settings['date_format']));
+        event_times_changed();
+      });
+
+      // register events on alarms and recurrence fields
+      me.init_alarms_edit('#edit-alarms');
+      me.init_recurrence_edit('#eventedit');
+
+      // reload free-busy status when changing the organizer identity
+      $('#eventedit').on('change', '#edit-identities-list', function(e) {
+        var email = settings.identities[$(this).val()],
+          icon = $(this).closest('tr').find('img.availabilityicon');
+
+        if (email && icon.length) {
+          icon.attr('data-email', email);
+          check_freebusy_status(icon, email, me.selected_event);
+        }
+      });
+
+      $('#event-export-startdate').datepicker(datepicker_settings);
+
+      // init attendees autocompletion
+      var ac_props;
+      // parallel autocompletion
+      if (rcmail.env.autocomplete_threads > 0) {
+        ac_props = {
+          threads: rcmail.env.autocomplete_threads,
+          sources: rcmail.env.autocomplete_sources
+        };
+      }
+      rcmail.init_address_input_events($('#edit-attendee-name'), ac_props);
+      rcmail.addEventListener('autocomplete_insert', function(e) {
+        var success = false;
+        if (e.field.name == 'participant') {
+          success = add_attendees(e.insert, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:(e.data && e.data.type == 'group' ? 'GROUP' : 'INDIVIDUAL') });
+        }
+        else if (e.field.name == 'resource' && e.data && e.data.email) {
+          success = add_attendee($.extend(e.data, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' }));
+        }
+        if (e.field && success) {
+          e.field.value = '';
+        }
+      });
+
+      $('#edit-attendee-add').click(function(){
+        var input = $('#edit-attendee-name');
+        rcmail.ksearch_blur();
+        if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'INDIVIDUAL' })) {
+          input.val('');
+        }
+      });
+
+      rcmail.init_address_input_events($('#edit-resource-name'), { action:'calendar/resources-autocomplete' });
+
+      $('#edit-resource-add').click(function(){
+        var input = $('#edit-resource-name');
+        rcmail.ksearch_blur();
+        if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' })) {
+          input.val('');
+        }
+      });
+      
+      $('#edit-resource-find').click(function(){
+        event_resources_dialog();
+        return false;
+      });
+
+      // handle change of "send invitations" checkbox
+      $('#edit-attendees-invite').change(function() {
+        $('#edit-attendees-donotify,input.edit-attendee-reply').prop('checked', this.checked);
+        // hide/show comment field
+        $('#eventedit .attendees-commentbox')[this.checked ? 'show' : 'hide']();
+      });
+
+      // delegate change event to "send invitations" checkbox
+      $('#edit-attendees-donotify').change(function() {
+        $('#edit-attendees-invite').click();
+        return false;
+      });
+
+      $('#edit-attendee-schedule').click(function(){
+        event_freebusy_dialog();
+      });
+
+      $('#shedule-freebusy-prev').html(bw.ie6 ? '&lt;&lt;' : '&#9668;').button().click(function(){ render_freebusy_grid(-1); });
+      $('#shedule-freebusy-next').html(bw.ie6 ? '&gt;&gt;' : '&#9658;').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(e) {
+        event_rsvp(this)
+      });
+
+      $('#eventedit input.edit-recurring-savemode').change(function(e) {
+        var sel = $('input.edit-recurring-savemode:checked').val(),
+          disabled = sel == 'current' || sel == 'future';
+        $('#event-panel-recurrence input, #event-panel-recurrence select, #event-panel-attachments input').prop('disabled', disabled);
+        $('#event-panel-recurrence, #event-panel-attachments')[(disabled?'addClass':'removeClass')]('disabled');
+      })
+
+      $('#eventshow .changersvp').click(function(e) {
+        var d = $('#eventshow'),
+          h = -$(this).closest('.event-line').toggle().height();
+        $('#event-rsvp').slideDown(300, function() {
+          h += $(this).height();
+          me.dialog_resize(d.get(0), d.height() + h, d.outerWidth() - 50);
+        });
+        return false;
+      })
+
+      // register click handler for message links
+      $('#edit-event-links, #event-links').on('click', 'li a.messagelink', function(e) {
+        rcmail.open_window(this.href);
+        if (!rcube_event.is_keyboard(e) && this.blur)
+          this.blur();
+        return false;
+      });
+
+      // register click handler for message delete buttons
+      $('#edit-event-links').on('click', 'li a.delete', function(e) {
+          remove_link(e.target);
+          return false;
+      });
+
+      $('#agenda-listrange').change(function(e){
+        settings['agenda_range'] = parseInt($(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);
+
+    // fetch counts for some calendars
+    fetch_counts();
+
+    // 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('calendar-delete', function(){ cal.calendar_delete(cal.calendars[cal.selected_calendar]); }, false);
+  rcmail.register_command('events-import', function(){ cal.import_events(cal.calendars[cal.selected_calendar]); }, true);
+  rcmail.register_command('calendar-showurl', function(){ cal.showurl(cal.calendars[cal.selected_calendar]); }, false);
+  rcmail.register_command('event-download', function(){ cal.event_download(cal.selected_event); }, true);
+  rcmail.register_command('event-sendbymail', function(p, obj, e){ cal.event_sendbymail(cal.selected_event, e); }, true);
+  rcmail.register_command('event-copy', function(){ cal.event_copy(cal.selected_event); }, true);
+  rcmail.register_command('event-history', function(p, obj, e){ cal.event_history_dialog(cal.selected_event); }, false);
+
+  // search and export events
+  rcmail.register_command('export', function(){ cal.export_events(cal.calendars[cal.selected_calendar]); }, true);
+  rcmail.register_command('search', function(){ cal.quicksearch(); }, true);
+  rcmail.register_command('reset-search', function(){ cal.reset_quicksearch(); }, true);
+
+  // resource invitation dialog
+  rcmail.register_command('search-resource', function(){ cal.resource_search(); }, true);
+  rcmail.register_command('reset-resource-search', function(){ cal.reset_resource_search(); }, true);
+  rcmail.register_command('add-resource', function(){ cal.add_resource2event(); }, false);
+
+  // register callback commands
+  rcmail.addEventListener('plugin.refresh_source', function(data) { cal.calendar_refresh_source(data); });
+  rcmail.addEventListener('plugin.destroy_source', function(p){ cal.calendar_destroy_source(p.id); });
+  rcmail.addEventListener('plugin.unlock_saving', function(p){ cal.unlock_saving(); });
+  rcmail.addEventListener('plugin.refresh_calendar', function(p){ cal.refresh(p); });
+  rcmail.addEventListener('plugin.import_success', function(p){ cal.import_success(p); });
+  rcmail.addEventListener('plugin.import_error', function(p){ cal.import_error(p); });
+  rcmail.addEventListener('plugin.update_counts', function(p){ cal.update_counts(p); });
+  rcmail.addEventListener('plugin.reload_view', function(p){ cal.reload_view(p); });
+  rcmail.addEventListener('plugin.resource_data', function(p){ cal.resource_data_load(p); });
+  rcmail.addEventListener('plugin.resource_owner', function(p){ cal.resource_owner_load(p); });
+  rcmail.addEventListener('plugin.render_event_changelog', function(data){ cal.render_event_changelog(data); });
+  rcmail.addEventListener('plugin.event_show_diff', function(data){ cal.event_show_diff(data); });
+  rcmail.addEventListener('plugin.close_history_dialog', function(data){ cal.close_history_dialog(); });
+  rcmail.addEventListener('plugin.event_show_revision', function(data){ cal.event_show_dialog(data, null, true); });
+  rcmail.addEventListener('plugin.itip_message_processed', function(data){ cal.itip_message_processed(data); });
+  rcmail.addEventListener('requestrefresh', function(q){ return cal.before_refresh(q); });
+
+  // let's go
+  var cal = new rcube_calendar_ui($.extend(rcmail.env.calendar_settings, rcmail.env.libcal_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();
+
+});