/**
 * Roundcube Webmail Client Script
 *
 * This file is part of the Roundcube Webmail client
 *
 * @licstart  The following is the entire license notice for the
 * JavaScript code in this file.
 *
 * Copyright (C) 2005-2014, The Roundcube Dev Team
 * Copyright (C) 2011-2014, Kolab Systems AG
 *
 * The JavaScript code in this page is free software: you can
 * redistribute it and/or modify it under the terms of the GNU
 * General Public License (GNU GPL) as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option)
 * any later version.  The code is distributed WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.
 *
 * As additional permission under GNU GPL version 3 section 7, you
 * may distribute non-source (e.g., minimized or compacted) forms of
 * that code without the copy of the GNU GPL normally required by
 * section 4, provided you include this license notice and a URL
 * through which recipients can access the Corresponding Source.
 *
 * @licend  The above is the entire license notice
 * for the JavaScript code in this file.
 *
 * @author Thomas Bruederli <roundcube@gmail.com>
 * @author Aleksander 'A.L.E.C' Machniak <alec@alec.pl>
 * @author Charles McNulty <charles@charlesmcnulty.com>
 *
 * @requires jquery.js, common.js, list.js
 */

function rcube_webmail()
{
  this.labels = {};
  this.buttons = {};
  this.buttons_sel = {};
  this.gui_objects = {};
  this.gui_containers = {};
  this.commands = {};
  this.command_handlers = {};
  this.onloads = [];
  this.messages = {};
  this.group2expand = {};
  this.http_request_jobs = {};
  this.menu_stack = [];

  // webmail client settings
  this.dblclick_time = 500;
  this.message_time = 5000;
  this.identifier_expr = /[^0-9a-z_-]/gi;

  // environment defaults
  this.env = {
    request_timeout: 180,  // seconds
    draft_autosave: 0,     // seconds
    comm_path: './',
    blankpage: 'program/resources/blank.gif',
    recipients_separator: ',',
    recipients_delimiter: ', ',
    popup_width: 1150,
    popup_width_small: 900
  };

  // create protected reference to myself
  this.ref = 'rcmail';
  var ref = this;

  // set jQuery ajax options
  $.ajaxSetup({
    cache: false,
    timeout: this.env.request_timeout * 1000,
    error: function(request, status, err){ ref.http_error(request, status, err); },
    beforeSend: function(xmlhttp){ xmlhttp.setRequestHeader('X-Roundcube-Request', ref.env.request_token); }
  });

  // unload fix
  $(window).bind('beforeunload', function() { ref.unload = true; });

  // set environment variable(s)
  this.set_env = function(p, value)
  {
    if (p != null && typeof p === 'object' && !value)
      for (var n in p)
        this.env[n] = p[n];
    else
      this.env[p] = value;
  };

  // add a localized label to the client environment
  this.add_label = function(p, value)
  {
    if (typeof p == 'string')
      this.labels[p] = value;
    else if (typeof p == 'object')
      $.extend(this.labels, p);
  };

  // add a button to the button list
  this.register_button = function(command, id, type, act, sel, over)
  {
    var button_prop = {id:id, type:type};

    if (act) button_prop.act = act;
    if (sel) button_prop.sel = sel;
    if (over) button_prop.over = over;

    if (!this.buttons[command])
      this.buttons[command] = [];

    this.buttons[command].push(button_prop);

    if (this.loaded)
      init_button(command, button_prop);
  };

  // register a specific gui object
  this.gui_object = function(name, id)
  {
    this.gui_objects[name] = this.loaded ? rcube_find_object(id) : id;
  };

  // register a container object
  this.gui_container = function(name, id)
  {
    this.gui_containers[name] = id;
  };

  // add a GUI element (html node) to a specified container
  this.add_element = function(elm, container)
  {
    if (this.gui_containers[container] && this.gui_containers[container].jquery)
      this.gui_containers[container].append(elm);
  };

  // register an external handler for a certain command
  this.register_command = function(command, callback, enable)
  {
    this.command_handlers[command] = callback;

    if (enable)
      this.enable_command(command, true);
  };

  // execute the given script on load
  this.add_onload = function(f)
  {
    this.onloads.push(f);
  };

  // initialize webmail client
  this.init = function()
  {
    var n;
    this.task = this.env.task;

    // check browser
    if (this.env.server_error != 409 && (!bw.dom || !bw.xmlhttp_test() || (bw.mz && bw.vendver < 1.9) || (bw.ie && bw.vendver < 7))) {
      this.goto_url('error', '_code=0x199');
      return;
    }

    // find all registered gui containers
    for (n in this.gui_containers)
      this.gui_containers[n] = $('#'+this.gui_containers[n]);

    // find all registered gui objects
    for (n in this.gui_objects)
      this.gui_objects[n] = rcube_find_object(this.gui_objects[n]);

    // clickjacking protection
    if (this.env.x_frame_options) {
      try {
        // bust frame if not allowed
        if (this.env.x_frame_options == 'deny' && top.location.href != self.location.href)
          top.location.href = self.location.href;
        else if (top.location.hostname != self.location.hostname)
          throw 1;
      } catch (e) {
        // possible clickjacking attack: disable all form elements
        $('form').each(function(){ ref.lock_form(this, true); });
        this.display_message("Blocked: possible clickjacking attack!", 'error');
        return;
      }
    }

    // init registered buttons
    this.init_buttons();

    // tell parent window that this frame is loaded
    if (this.is_framed()) {
      parent.rcmail.set_busy(false, null, parent.rcmail.env.frame_lock);
      parent.rcmail.env.frame_lock = null;
    }

    // enable general commands
    this.enable_command('close', 'logout', 'mail', 'addressbook', 'settings', 'save-pref',
      'compose', 'undo', 'about', 'switch-task', 'menu-open', 'menu-close', 'menu-save', true);

    // set active task button
    this.set_button(this.task, 'sel');

    if (this.env.permaurl)
      this.enable_command('permaurl', 'extwin', true);

    switch (this.task) {

      case 'mail':
        // enable mail commands
        this.enable_command('list', 'checkmail', 'add-contact', 'search', 'reset-search', 'collapse-folder', 'import-messages', true);

        if (this.gui_objects.messagelist) {
          this.message_list = new rcube_list_widget(this.gui_objects.messagelist, {
            multiselect:true, multiexpand:true, draggable:true, keyboard:true,
            column_movable:this.env.col_movable, dblclick_time:this.dblclick_time
            });
          this.message_list
            .addEventListener('initrow', function(o) { ref.init_message_row(o); })
            .addEventListener('dblclick', function(o) { ref.msglist_dbl_click(o); })
            .addEventListener('click', function(o) { ref.msglist_click(o); })
            .addEventListener('keypress', function(o) { ref.msglist_keypress(o); })
            .addEventListener('select', function(o) { ref.msglist_select(o); })
            .addEventListener('dragstart', function(o) { ref.drag_start(o); })
            .addEventListener('dragmove', function(e) { ref.drag_move(e); })
            .addEventListener('dragend', function(e) { ref.drag_end(e); })
            .addEventListener('expandcollapse', function(o) { ref.msglist_expand(o); })
            .addEventListener('column_replace', function(o) { ref.msglist_set_coltypes(o); })
            .addEventListener('listupdate', function(o) { ref.triggerEvent('listupdate', o); })
            .init();

          // TODO: this should go into the list-widget code
          $(this.message_list.thead).on('click', 'a.sortcol', function(e){
            return ref.command('sort', $(this).attr('rel'), this);
          });

          this.enable_command('toggle_status', 'toggle_flag', 'sort', true);
          this.enable_command('set-listmode', this.env.threads && !this.is_multifolder_listing());

          // load messages
          this.command('list');

          $(this.gui_objects.qsearchbox).val(this.env.search_text).focusin(function() { ref.message_list.blur(); });
        }

        this.set_button_titles();

        this.env.message_commands = ['show', 'reply', 'reply-all', 'reply-list',
          'move', 'copy', 'delete', 'open', 'mark', 'edit', 'viewsource',
          'print', 'load-attachment', 'download-attachment', 'show-headers', 'hide-headers', 'download',
          'forward', 'forward-inline', 'forward-attachment', 'change-format'];

        if (this.env.action == 'show' || this.env.action == 'preview') {
          this.enable_command(this.env.message_commands, this.env.uid);
          this.enable_command('reply-list', this.env.list_post);

          if (this.env.action == 'show') {
            this.http_request('pagenav', {_uid: this.env.uid, _mbox: this.env.mailbox, _search: this.env.search_request},
              this.display_message('', 'loading'));
          }

          if (this.env.blockedobjects) {
            if (this.gui_objects.remoteobjectsmsg)
              this.gui_objects.remoteobjectsmsg.style.display = 'block';
            this.enable_command('load-images', 'always-load', true);
          }

          // make preview/message frame visible
          if (this.env.action == 'preview' && this.is_framed()) {
            this.enable_command('compose', 'add-contact', false);
            parent.rcmail.show_contentframe(true);
          }
        }
        else if (this.env.action == 'compose') {
          this.env.address_group_stack = [];
          this.env.compose_commands = ['send-attachment', 'remove-attachment', 'send', 'cancel',
            'toggle-editor', 'list-adresses', 'pushgroup', 'search', 'reset-search', 'extwin',
            'insert-response', 'save-response', 'menu-open', 'menu-close'];

          if (this.env.drafts_mailbox)
            this.env.compose_commands.push('savedraft')

          this.enable_command(this.env.compose_commands, 'identities', 'responses', true);

          // add more commands (not enabled)
          $.merge(this.env.compose_commands, ['add-recipient', 'firstpage', 'previouspage', 'nextpage', 'lastpage']);

          if (window.googie) {
            this.env.editor_config.spellchecker = googie;
            this.env.editor_config.spellcheck_observer = function(s) { ref.spellcheck_state(); };

            this.env.compose_commands.push('spellcheck')
            this.enable_command('spellcheck', true);
          }

          // initialize HTML editor
          this.editor_init(this.env.editor_config, this.env.composebody);

          // init canned response functions
          if (this.gui_objects.responseslist) {
            $('a.insertresponse', this.gui_objects.responseslist)
              .attr('unselectable', 'on')
              .mousedown(function(e){ return rcube_event.cancel(e); })
              .bind('mouseup keypress', function(e){
                if (e.type == 'mouseup' || rcube_event.get_keycode(e) == 13) {
                  ref.command('insert-response', $(this).attr('rel'));
                  $(document.body).trigger('mouseup');  // hides the menu
                  return rcube_event.cancel(e);
                }
              });

            // avoid textarea loosing focus when hitting the save-response button/link
            $.each(this.buttons['save-response'] || [], function (i, v) {
              $('#' + v.id).mousedown(function(e){ return rcube_event.cancel(e); })
            });
          }

          // init message compose form
          this.init_messageform();
        }
        else if (this.env.action == 'get')
          this.enable_command('download', 'print', true);
        // show printing dialog
        else if (this.env.action == 'print' && this.env.uid) {
          if (bw.safari)
            setTimeout('window.print()', 10);
          else
            window.print();
        }

        // get unread count for each mailbox
        if (this.gui_objects.mailboxlist) {
          this.env.unread_counts = {};
          this.gui_objects.folderlist = this.gui_objects.mailboxlist;
          this.http_request('getunread');
        }

        // init address book widget
        if (this.gui_objects.contactslist) {
          this.contact_list = new rcube_list_widget(this.gui_objects.contactslist,
            { multiselect:true, draggable:false, keyboard:true });
          this.contact_list
            .addEventListener('initrow', function(o) { ref.triggerEvent('insertrow', { cid:o.uid, row:o }); })
            .addEventListener('select', function(o) { ref.compose_recipient_select(o); })
            .addEventListener('dblclick', function(o) { ref.compose_add_recipient(); })
            .addEventListener('keypress', function(o) {
              if (o.key_pressed == o.ENTER_KEY) {
                if (!ref.compose_add_recipient()) {
                  // execute link action on <enter> if not a recipient entry
                  if (o.last_selected && String(o.last_selected).charAt(0) == 'G') {
                    $(o.rows[o.last_selected].obj).find('a').first().click();
                  }
                }
              }
            })
            .init();

          // remember last focused address field
          $('#_to,#_cc,#_bcc').focus(function() { ref.env.focused_field = this; });
        }

        if (this.gui_objects.addressbookslist) {
          this.gui_objects.folderlist = this.gui_objects.addressbookslist;
          this.enable_command('list-adresses', true);
        }

        // ask user to send MDN
        if (this.env.mdn_request && this.env.uid) {
          var postact = 'sendmdn',
            postdata = {_uid: this.env.uid, _mbox: this.env.mailbox};
          if (!confirm(this.get_label('mdnrequest'))) {
            postdata._flag = 'mdnsent';
            postact = 'mark';
          }
          this.http_post(postact, postdata);
        }

        // detect browser capabilities
        if (!this.is_framed() && !this.env.extwin)
          this.browser_capabilities_check();

        break;

      case 'addressbook':
        this.env.address_group_stack = [];

        if (this.gui_objects.folderlist)
          this.env.contactfolders = $.extend($.extend({}, this.env.address_sources), this.env.contactgroups);

        this.enable_command('add', 'import', this.env.writable_source);
        this.enable_command('list', 'listgroup', 'pushgroup', 'popgroup', 'listsearch', 'search', 'reset-search', 'advanced-search', true);

        if (this.gui_objects.contactslist) {
          this.contact_list = new rcube_list_widget(this.gui_objects.contactslist,
            {multiselect:true, draggable:this.gui_objects.folderlist?true:false, keyboard:true});
          this.contact_list
            .addEventListener('initrow', function(o) { ref.triggerEvent('insertrow', { cid:o.uid, row:o }); })
            .addEventListener('keypress', function(o) { ref.contactlist_keypress(o); })
            .addEventListener('select', function(o) { ref.contactlist_select(o); })
            .addEventListener('dragstart', function(o) { ref.drag_start(o); })
            .addEventListener('dragmove', function(e) { ref.drag_move(e); })
            .addEventListener('dragend', function(e) { ref.drag_end(e); })
            .init();

          $(this.gui_objects.qsearchbox).focusin(function() { ref.contact_list.blur(); });

          this.update_group_commands();
          this.command('list');
        }

        if (this.gui_objects.savedsearchlist) {
          this.savedsearchlist = new rcube_treelist_widget(this.gui_objects.savedsearchlist, {
            id_prefix: 'rcmli',
            id_encode: this.html_identifier_encode,
            id_decode: this.html_identifier_decode
          });

          this.savedsearchlist.addEventListener('select', function(node) {
            ref.triggerEvent('selectfolder', { folder:node.id, prefix:'rcmli' }); });
        }

        this.set_page_buttons();

        if (this.env.cid) {
          this.enable_command('show', 'edit', true);
          // register handlers for group assignment via checkboxes
          if (this.gui_objects.editform) {
            $('input.groupmember').change(function() {
              ref.group_member_change(this.checked ? 'add' : 'del', ref.env.cid, ref.env.source, this.value);
            });
          }
        }

        if (this.gui_objects.editform) {
          this.enable_command('save', true);
          if (this.env.action == 'add' || this.env.action == 'edit' || this.env.action == 'search')
              this.init_contact_form();
        }

        break;

      case 'settings':
        this.enable_command('preferences', 'identities', 'responses', 'save', 'folders', true);

        if (this.env.action == 'identities') {
          this.enable_command('add', this.env.identities_level < 2);
        }
        else if (this.env.action == 'edit-identity' || this.env.action == 'add-identity') {
          this.enable_command('save', 'edit', 'toggle-editor', true);
          this.enable_command('delete', this.env.identities_level < 2);

          // initialize HTML editor
          this.editor_init(this.env.editor_config, 'rcmfd_signature');
        }
        else if (this.env.action == 'folders') {
          this.enable_command('subscribe', 'unsubscribe', 'create-folder', 'rename-folder', true);
        }
        else if (this.env.action == 'edit-folder' && this.gui_objects.editform) {
          this.enable_command('save', 'folder-size', true);
          parent.rcmail.env.exists = this.env.messagecount;
          parent.rcmail.enable_command('purge', this.env.messagecount);
        }
        else if (this.env.action == 'responses') {
          this.enable_command('add', true);
        }

        if (this.gui_objects.identitieslist) {
          this.identity_list = new rcube_list_widget(this.gui_objects.identitieslist,
            {multiselect:false, draggable:false, keyboard:true});
          this.identity_list
            .addEventListener('select', function(o) { ref.identity_select(o); })
            .addEventListener('keypress', function(o) {
              if (o.key_pressed == o.ENTER_KEY) {
                ref.identity_select(o);
              }
            })
            .init()
            .focus();
        }
        else if (this.gui_objects.sectionslist) {
          this.sections_list = new rcube_list_widget(this.gui_objects.sectionslist, {multiselect:false, draggable:false, keyboard:true});
          this.sections_list
            .addEventListener('select', function(o) { ref.section_select(o); })
            .addEventListener('keypress', function(o) { if (o.key_pressed == o.ENTER_KEY) ref.section_select(o); })
            .init()
            .focus();
        }
        else if (this.gui_objects.subscriptionlist) {
          this.init_subscription_list();
        }
        else if (this.gui_objects.responseslist) {
          this.responses_list = new rcube_list_widget(this.gui_objects.responseslist, {multiselect:false, draggable:false, keyboard:true});
          this.responses_list
            .addEventListener('select', function(list) {
              var win, id = list.get_single_selection();
              ref.enable_command('delete', !!id && $.inArray(id, ref.env.readonly_responses) < 0);
              if (id && (win = ref.get_frame_window(ref.env.contentframe))) {
                ref.set_busy(true);
                ref.location_href({ _action:'edit-response', _key:id, _framed:1 }, win);
              }
            })
            .init()
            .focus();
        }

        break;

      case 'login':
        var input_user = $('#rcmloginuser');
        input_user.bind('keyup', function(e){ return ref.login_user_keyup(e); });

        if (input_user.val() == '')
          input_user.focus();
        else
          $('#rcmloginpwd').focus();

        // detect client timezone
        if (window.jstz) {
          var timezone = jstz.determine();
          if (timezone.name())
            $('#rcmlogintz').val(timezone.name());
        }
        else {
          $('#rcmlogintz').val(new Date().getStdTimezoneOffset() / -60);
        }

        // display 'loading' message on form submit, lock submit button
        $('form').submit(function () {
          $('input[type=submit]', this).prop('disabled', true);
          ref.clear_messages();
          ref.display_message('', 'loading');
        });

        this.enable_command('login', true);
        break;
    }

    // select first input field in an edit form
    if (this.gui_objects.editform)
      $("input,select,textarea", this.gui_objects.editform)
        .not(':hidden').not(':disabled').first().select().focus();

    // unset contentframe variable if preview_pane is enabled
    if (this.env.contentframe && !$('#' + this.env.contentframe).is(':visible'))
      this.env.contentframe = null;

    // prevent from form submit with Enter key in file input fields
    if (bw.ie)
      $('input[type=file]').keydown(function(e) { if (e.keyCode == '13') e.preventDefault(); });

    // flag object as complete
    this.loaded = true;
    this.env.lastrefresh = new Date();

    // show message
    if (this.pending_message)
      this.display_message(this.pending_message[0], this.pending_message[1], this.pending_message[2]);

    // init treelist widget
    if (this.gui_objects.folderlist && window.rcube_treelist_widget) {
      this.treelist = new rcube_treelist_widget(this.gui_objects.folderlist, {
          selectable: true,
          id_prefix: 'rcmli',
          id_encode: this.html_identifier_encode,
          id_decode: this.html_identifier_decode,
          check_droptarget: function(node) { return !node.virtual && ref.check_droptarget(node.id) }
      });

      this.treelist
        .addEventListener('collapse', function(node) { ref.folder_collapsed(node) })
        .addEventListener('expand', function(node) { ref.folder_collapsed(node) })
        .addEventListener('select', function(node) { ref.triggerEvent('selectfolder', { folder:node.id, prefix:'rcmli' }) });
    }

    // activate html5 file drop feature (if browser supports it and if configured)
    if (this.gui_objects.filedrop && this.env.filedrop && ((window.XMLHttpRequest && XMLHttpRequest.prototype && XMLHttpRequest.prototype.sendAsBinary) || window.FormData)) {
      $(document.body).bind('dragover dragleave drop', function(e){ return ref.document_drag_hover(e, e.type == 'dragover'); });
      $(this.gui_objects.filedrop).addClass('droptarget')
        .bind('dragover dragleave', function(e){ return ref.file_drag_hover(e, e.type == 'dragover'); })
        .get(0).addEventListener('drop', function(e){ return ref.file_dropped(e); }, false);
    }

    // catch document (and iframe) mouse clicks
    var body_mouseup = function(e){ return ref.doc_mouse_up(e); };
    $(document.body)
      .bind('mouseup', body_mouseup)
      .bind('keydown', function(e){ return ref.doc_keypress(e); });

    $('iframe').load(function(e) {
        try { $(this.contentDocument || this.contentWindow).on('mouseup', body_mouseup);  }
        catch (e) {/* catch possible "Permission denied" error in IE */ }
      })
      .contents().on('mouseup', body_mouseup);

    // trigger init event hook
    this.triggerEvent('init', { task:this.task, action:this.env.action });

    // execute all foreign onload scripts
    // @deprecated
    for (n in this.onloads) {
      if (typeof this.onloads[n] === 'string')
        eval(this.onloads[n]);
      else if (typeof this.onloads[n] === 'function')
        this.onloads[n]();
    }

    // start keep-alive and refresh intervals
    this.start_refresh();
    this.start_keepalive();
  };

  this.log = function(msg)
  {
    if (window.console && console.log)
      console.log(msg);
  };

  /*********************************************************/
  /*********       client command interface        *********/
  /*********************************************************/

  // execute a specific command on the web client
  this.command = function(command, props, obj, event)
  {
    var ret, uid, cid, url, flag, aborted = false;

    if (obj && obj.blur && !(event && rcube_event.is_keyboard(event)))
      obj.blur();

    // do nothing if interface is locked by other command (with exception for searching reset)
    if (this.busy && !(command == 'reset-search' && this.last_command == 'search'))
      return false;

    // let the browser handle this click (shift/ctrl usually opens the link in a new window/tab)
    if ((obj && obj.href && String(obj.href).indexOf('#') < 0) && rcube_event.get_modifier(event)) {
      return true;
    }

    // command not supported or allowed
    if (!this.commands[command]) {
      // pass command to parent window
      if (this.is_framed())
        parent.rcmail.command(command, props);

      return false;
    }

    // check input before leaving compose step
    if (this.task == 'mail' && this.env.action == 'compose' && $.inArray(command, this.env.compose_commands) < 0 && !this.env.server_error) {
      if (this.cmp_hash != this.compose_field_hash() && !confirm(this.get_label('notsentwarning')))
        return false;

      // remove copy from local storage if compose screen is left intentionally
      this.remove_compose_data(this.env.compose_id);
      this.compose_skip_unsavedcheck = true;
    }

    this.last_command = command;

    // process external commands
    if (typeof this.command_handlers[command] === 'function') {
      ret = this.command_handlers[command](props, obj, event);
      return ret !== undefined ? ret : (obj ? false : true);
    }
    else if (typeof this.command_handlers[command] === 'string') {
      ret = window[this.command_handlers[command]](props, obj, event);
      return ret !== undefined ? ret : (obj ? false : true);
    }

    // trigger plugin hooks
    this.triggerEvent('actionbefore', {props:props, action:command, originalEvent:event});
    ret = this.triggerEvent('before'+command, props || event);
    if (ret !== undefined) {
      // abort if one of the handlers returned false
      if (ret === false)
        return false;
      else
        props = ret;
    }

    ret = undefined;

    // process internal command
    switch (command) {

      case 'login':
        if (this.gui_objects.loginform)
          this.gui_objects.loginform.submit();
        break;

      // commands to switch task
      case 'logout':
      case 'mail':
      case 'addressbook':
      case 'settings':
        this.switch_task(command);
        break;

      case 'about':
        this.redirect('?_task=settings&_action=about', false);
        break;

      case 'permaurl':
        if (obj && obj.href && obj.target)
          return true;
        else if (this.env.permaurl)
          parent.location.href = this.env.permaurl;
        break;

      case 'extwin':
        if (this.env.action == 'compose') {
          var form = this.gui_objects.messageform,
            win = this.open_window('');

          if (win) {
            this.save_compose_form_local();
            this.compose_skip_unsavedcheck = true;
            $("input[name='_action']", form).val('compose');
            form.action = this.url('mail/compose', { _id: this.env.compose_id, _extwin: 1 });
            form.target = win.name;
            form.submit();
          }
        }
        else {
          this.open_window(this.env.permaurl, true);
        }
        break;

      case 'change-format':
        url = this.env.permaurl + '&_format=' + props;

        if (this.env.action == 'preview')
          url = url.replace(/_action=show/, '_action=preview') + '&_framed=1';
        if (this.env.extwin)
          url += '&_extwin=1';

        location.href = url;
        break;

      case 'menu-open':
        if (props && props.menu == 'attachmentmenu') {
          var mimetype = this.env.attachments[props.id];
          this.enable_command('open-attachment', mimetype && this.env.mimetypes && $.inArray(mimetype, this.env.mimetypes) >= 0);
        }
        this.show_menu(props, props.show || undefined, event);
        break;

      case 'menu-close':
        this.hide_menu(props, event);
        break;

      case 'menu-save':
        this.triggerEvent(command, {props:props, originalEvent:event});
        return false;

      case 'open':
        if (uid = this.get_single_uid()) {
          obj.href = this.url('show', {_mbox: this.get_message_mailbox(uid), _uid: uid});
          return true;
        }
        break;

      case 'close':
        if (this.env.extwin)
          window.close();
        break;

      case 'list':
        if (props && props != '') {
          this.reset_qsearch();
        }
        if (this.env.action == 'compose' && this.env.extwin) {
          window.close();
        }
        else if (this.task == 'mail') {
          this.list_mailbox(props);
          this.set_button_titles();
        }
        else if (this.task == 'addressbook')
          this.list_contacts(props);
        break;

      case 'set-listmode':
        this.set_list_options(null, undefined, undefined, props == 'threads' ? 1 : 0);
        break;

      case 'sort':
        var sort_order = this.env.sort_order,
          sort_col = !this.env.disabled_sort_col ? props : this.env.sort_col;

        if (!this.env.disabled_sort_order)
          sort_order = this.env.sort_col == sort_col && sort_order == 'ASC' ? 'DESC' : 'ASC';

        // set table header and update env
        this.set_list_sorting(sort_col, sort_order);

        // reload message list
        this.list_mailbox('', '', sort_col+'_'+sort_order);
        break;

      case 'nextpage':
        this.list_page('next');
        break;

      case 'lastpage':
        this.list_page('last');
        break;

      case 'previouspage':
        this.list_page('prev');
        break;

      case 'firstpage':
        this.list_page('first');
        break;

      case 'expunge':
        if (this.env.exists)
          this.expunge_mailbox(this.env.mailbox);
        break;

      case 'purge':
      case 'empty-mailbox':
        if (this.env.exists)
          this.purge_mailbox(this.env.mailbox);
        break;

      // common commands used in multiple tasks
      case 'show':
        if (this.task == 'mail') {
          uid = this.get_single_uid();
          if (uid && (!this.env.uid || uid != this.env.uid)) {
            if (this.env.mailbox == this.env.drafts_mailbox)
              this.open_compose_step({ _draft_uid: uid, _mbox: this.env.mailbox });
            else
              this.show_message(uid);
          }
        }
        else if (this.task == 'addressbook') {
          cid = props ? props : this.get_single_cid();
          if (cid && !(this.env.action == 'show' && cid == this.env.cid))
            this.load_contact(cid, 'show');
        }
        break;

      case 'add':
        if (this.task == 'addressbook')
          this.load_contact(0, 'add');
        else if (this.task == 'settings' && this.env.action == 'responses') {
          var frame;
          if ((frame = this.get_frame_window(this.env.contentframe))) {
            this.set_busy(true);
            this.location_href({ _action:'add-response', _framed:1 }, frame);
          }
        }
        else if (this.task == 'settings') {
          this.identity_list.clear_selection();
          this.load_identity(0, 'add-identity');
        }
        break;

      case 'edit':
        if (this.task == 'addressbook' && (cid = this.get_single_cid()))
          this.load_contact(cid, 'edit');
        else if (this.task == 'settings' && props)
          this.load_identity(props, 'edit-identity');
        else if (this.task == 'mail' && (uid = this.get_single_uid())) {
          url = { _mbox: this.get_message_mailbox(uid) };
          url[this.env.mailbox == this.env.drafts_mailbox && props != 'new' ? '_draft_uid' : '_uid'] = uid;
          this.open_compose_step(url);
        }
        break;

      case 'save':
        var input, form = this.gui_objects.editform;
        if (form) {
          // adv. search
          if (this.env.action == 'search') {
          }
          // user prefs
          else if ((input = $("input[name='_pagesize']", form)) && input.length && isNaN(parseInt(input.val()))) {
            alert(this.get_label('nopagesizewarning'));
            input.focus();
            break;
          }
          // contacts/identities
          else {
            // reload form
            if (props == 'reload') {
              form.action += '?_reload=1';
            }
            else if (this.task == 'settings' && (this.env.identities_level % 2) == 0  &&
              (input = $("input[name='_email']", form)) && input.length && !rcube_check_email(input.val())
            ) {
              alert(this.get_label('noemailwarning'));
              input.focus();
              break;
            }

            // clear empty input fields
            $('input.placeholder').each(function(){ if (this.value == this._placeholder) this.value = ''; });
          }

          // add selected source (on the list)
          if (parent.rcmail && parent.rcmail.env.source)
            form.action = this.add_url(form.action, '_orig_source', parent.rcmail.env.source);

          form.submit();
        }
        break;

      case 'delete':
        // mail task
        if (this.task == 'mail')
          this.delete_messages(event);
        // addressbook task
        else if (this.task == 'addressbook')
          this.delete_contacts();
        // settings: canned response
        else if (this.task == 'settings' && this.env.action == 'responses')
          this.delete_response();
        // settings: user identities
        else if (this.task == 'settings')
          this.delete_identity();
        break;

      // mail task commands
      case 'move':
      case 'moveto': // deprecated
        if (this.task == 'mail')
          this.move_messages(props, event);
        else if (this.task == 'addressbook')
          this.move_contacts(props);
        break;

      case 'copy':
        if (this.task == 'mail')
          this.copy_messages(props, event);
        else if (this.task == 'addressbook')
          this.copy_contacts(props);
        break;

      case 'mark':
        if (props)
          this.mark_message(props);
        break;

      case 'toggle_status':
      case 'toggle_flag':
        flag = command == 'toggle_flag' ? 'flagged' : 'read';

        if (uid = props) {
          // toggle flagged/unflagged
          if (flag == 'flagged') {
            if (this.message_list.rows[uid].flagged)
              flag = 'unflagged';
          }
          // toggle read/unread
          else if (this.message_list.rows[uid].deleted)
            flag = 'undelete';
          else if (!this.message_list.rows[uid].unread)
            flag = 'unread';

          this.mark_message(flag, uid);
        }

        break;

      case 'always-load':
        if (this.env.uid && this.env.sender) {
          this.add_contact(this.env.sender);
          setTimeout(function(){ ref.command('load-images'); }, 300);
          break;
        }

      case 'load-images':
        if (this.env.uid)
          this.show_message(this.env.uid, true, this.env.action=='preview');
        break;

      case 'load-attachment':
      case 'open-attachment':
      case 'download-attachment':
        var qstring = '_mbox='+urlencode(this.env.mailbox)+'&_uid='+this.env.uid+'&_part='+props,
          mimetype = this.env.attachments[props];

        // open attachment in frame if it's of a supported mimetype
        if (command != 'download-attachment' && mimetype && this.env.mimetypes && $.inArray(mimetype, this.env.mimetypes) >= 0) {
          if (this.open_window(this.env.comm_path+'&_action=get&'+qstring+'&_frame=1'))
            break;
        }

        this.goto_url('get', qstring+'&_download=1', false);
        break;

      case 'select-all':
        this.select_all_mode = props ? false : true;
        this.dummy_select = true; // prevent msg opening if there's only one msg on the list
        if (props == 'invert')
          this.message_list.invert_selection();
        else
          this.message_list.select_all(props == 'page' ? '' : props);
        this.dummy_select = null;
        break;

      case 'select-none':
        this.select_all_mode = false;
        this.message_list.clear_selection();
        break;

      case 'expand-all':
        this.env.autoexpand_threads = 1;
        this.message_list.expand_all();
        break;

      case 'expand-unread':
        this.env.autoexpand_threads = 2;
        this.message_list.collapse_all();
        this.expand_unread();
        break;

      case 'collapse-all':
        this.env.autoexpand_threads = 0;
        this.message_list.collapse_all();
        break;

      case 'nextmessage':
        if (this.env.next_uid)
          this.show_message(this.env.next_uid, false, this.env.action == 'preview');
        break;

      case 'lastmessage':
        if (this.env.last_uid)
          this.show_message(this.env.last_uid);
        break;

      case 'previousmessage':
        if (this.env.prev_uid)
          this.show_message(this.env.prev_uid, false, this.env.action == 'preview');
        break;

      case 'firstmessage':
        if (this.env.first_uid)
          this.show_message(this.env.first_uid);
        break;

      case 'compose':
        url = {};

        if (this.task == 'mail') {
          url._mbox = this.env.mailbox;
          if (props)
            url._to = props;
          // also send search request so we can go back to search result after message is sent
          if (this.env.search_request)
            url._search = this.env.search_request;
        }
        // modify url if we're in addressbook
        else if (this.task == 'addressbook') {
          // switch to mail compose step directly
          if (props && props.indexOf('@') > 0) {
            url._to = props;
          }
          else {
            var a_cids = [];
            // use contact id passed as command parameter
            if (props)
              a_cids.push(props);
            // get selected contacts
            else if (this.contact_list)
              a_cids = this.contact_list.get_selection();

            if (a_cids.length)
              this.http_post('mailto', { _cid: a_cids.join(','), _source: this.env.source }, true);
            else if (this.env.group)
              this.http_post('mailto', { _gid: this.env.group, _source: this.env.source }, true);

            break;
          }
        }
        else if (props && typeof props == 'string') {
          url._to = props;
        }
        else if (props && typeof props == 'object') {
          $.extend(url, props);
        }

        this.open_compose_step(url);
        break;

      case 'spellcheck':
        if (this.spellcheck_state()) {
          this.editor.spellcheck_stop();
        }
        else {
          this.editor.spellcheck_start();
        }
        break;

      case 'savedraft':
        // Reset the auto-save timer
        clearTimeout(this.save_timer);

        // compose form did not change (and draft wasn't saved already)
        if (this.env.draft_id && this.cmp_hash == this.compose_field_hash()) {
          this.auto_save_start();
          break;
        }

        this.submit_messageform(true);
        break;

      case 'send':
        if (!props.nocheck && !this.check_compose_input(command))
          break;

        // Reset the auto-save timer
        clearTimeout(this.save_timer);

        this.submit_messageform();
        break;

      case 'send-attachment':
        // Reset the auto-save timer
        clearTimeout(this.save_timer);

        if (!(flag = this.upload_file(props || this.gui_objects.uploadform, 'upload'))) {
          if (flag !== false)
            alert(this.get_label('selectimportfile'));
          aborted = true;
        }
        break;

      case 'insert-sig':
        this.change_identity($("[name='_from']")[0], true);
        break;

      case 'list-adresses':
        this.list_contacts(props);
        this.enable_command('add-recipient', false);
        break;

      case 'add-recipient':
        this.compose_add_recipient(props);
        break;

      case 'reply-all':
      case 'reply-list':
      case 'reply':
        if (uid = this.get_single_uid()) {
          url = {_reply_uid: uid, _mbox: this.get_message_mailbox(uid)};
          if (command == 'reply-all')
            // do reply-list, when list is detected and popup menu wasn't used
            url._all = (!props && this.env.reply_all_mode == 1 && this.commands['reply-list'] ? 'list' : 'all');
          else if (command == 'reply-list')
            url._all = 'list';

          this.open_compose_step(url);
        }
        break;

      case 'forward-attachment':
      case 'forward-inline':
      case 'forward':
        var uids = this.env.uid ? [this.env.uid] : (this.message_list ? this.message_list.get_selection() : []);
        if (uids.length) {
          url = { _forward_uid: this.uids_to_list(uids), _mbox: this.env.mailbox, _search: this.env.search_request };
          if (command == 'forward-attachment' || (!props && this.env.forward_attachment) || uids.length > 1)
            url._attachment = 1;
          this.open_compose_step(url);
        }
        break;

      case 'print':
        if (this.env.action == 'get') {
          this.gui_objects.messagepartframe.contentWindow.print();
        }
        else if (uid = this.get_single_uid()) {
          url = '&_action=print&_uid='+uid+'&_mbox='+urlencode(this.get_message_mailbox(uid))+(this.env.safemode ? '&_safe=1' : '');
          if (this.open_window(this.env.comm_path + url, true, true)) {
            if (this.env.action != 'show')
              this.mark_message('read', uid);
          }
        }
        break;

      case 'viewsource':
        if (uid = this.get_single_uid())
          this.open_window(this.env.comm_path+'&_action=viewsource&_uid='+uid+'&_mbox='+urlencode(this.env.mailbox), true, true);
        break;

      case 'download':
        if (this.env.action == 'get') {
          location.href = location.href.replace(/_frame=/, '_download=');
        }
        else if (uid = this.get_single_uid()) {
          this.goto_url('viewsource', { _uid: uid, _mbox: this.get_message_mailbox(uid), _save: 1 });
        }
        break;

      // quicksearch
      case 'search':
        if (!props && this.gui_objects.qsearchbox)
          props = this.gui_objects.qsearchbox.value;
        if (props) {
          this.qsearch(props);
          break;
        }

      // reset quicksearch
      case 'reset-search':
        var n, s = this.env.search_request || this.env.qsearch;

        this.reset_qsearch();
        this.select_all_mode = false;

        if (s && this.env.action == 'compose') {
          if (this.contact_list)
            this.list_contacts_clear();
        }
        else if (s && this.env.mailbox) {
          this.list_mailbox(this.env.mailbox, 1);
        }
        else if (s && this.task == 'addressbook') {
          if (this.env.source == '') {
            for (n in this.env.address_sources) break;
            this.env.source = n;
            this.env.group = '';
          }
          this.list_contacts(this.env.source, this.env.group, 1);
        }
        break;

      case 'pushgroup':
        // add group ID to stack
        this.env.address_group_stack.push(props.id);
        if (obj && event)
          rcube_event.cancel(event);

      case 'listgroup':
        this.reset_qsearch();
        this.list_contacts(props.source, props.id);
        break;

      case 'popgroup':
        if (this.env.address_group_stack.length > 1) {
          this.env.address_group_stack.pop();
          this.reset_qsearch();
          this.list_contacts(props.source, this.env.address_group_stack[this.env.address_group_stack.length-1]);
        }
        break;

      case 'import-messages':
        var form = props || this.gui_objects.importform,
          importlock = this.set_busy(true, 'importwait');

        $('input[name="_unlock"]', form).val(importlock);

        if (!(flag = this.upload_file(form, 'import'))) {
          this.set_busy(false, null, importlock);
          if (flag !== false)
            alert(this.get_label('selectimportfile'));
          aborted = true;
        }
        break;

      case 'import':
        if (this.env.action == 'import' && this.gui_objects.importform) {
          var file = document.getElementById('rcmimportfile');
          if (file && !file.value) {
            alert(this.get_label('selectimportfile'));
            aborted = true;
            break;
          }
          this.gui_objects.importform.submit();
          this.set_busy(true, 'importwait');
          this.lock_form(this.gui_objects.importform, true);
        }
        else
          this.goto_url('import', (this.env.source ? '_target='+urlencode(this.env.source)+'&' : ''));
        break;

      case 'export':
        if (this.contact_list.rowcount > 0) {
          this.goto_url('export', { _source: this.env.source, _gid: this.env.group, _search: this.env.search_request });
        }
        break;

      case 'export-selected':
        if (this.contact_list.rowcount > 0) {
          this.goto_url('export', { _source: this.env.source, _gid: this.env.group, _cid: this.contact_list.get_selection().join(',') });
        }
        break;

      case 'upload-photo':
        this.upload_contact_photo(props || this.gui_objects.uploadform);
        break;

      case 'delete-photo':
        this.replace_contact_photo('-del-');
        break;

      // user settings commands
      case 'preferences':
      case 'identities':
      case 'responses':
      case 'folders':
        this.goto_url('settings/' + command);
        break;

      case 'undo':
        this.http_request('undo', '', this.display_message('', 'loading'));
        break;

      // unified command call (command name == function name)
      default:
        var func = command.replace(/-/g, '_');
        if (this[func] && typeof this[func] === 'function') {
          ret = this[func](props, obj, event);
        }
        break;
    }

    if (!aborted && this.triggerEvent('after'+command, props) === false)
      ret = false;
    this.triggerEvent('actionafter', { props:props, action:command, aborted:aborted });

    return ret === false ? false : obj ? false : true;
  };

  // set command(s) enabled or disabled
  this.enable_command = function()
  {
    var i, n, args = Array.prototype.slice.call(arguments),
      enable = args.pop(), cmd;

    for (n=0; n<args.length; n++) {
      cmd = args[n];
      // argument of type array
      if (typeof cmd === 'string') {
        this.commands[cmd] = enable;
        this.set_button(cmd, (enable ? 'act' : 'pas'));
        this.triggerEvent('enable-command', {command: cmd, status: enable});
      }
      // push array elements into commands array
      else {
        for (i in cmd)
          args.push(cmd[i]);
      }
    }
  };

  this.command_enabled = function(cmd)
  {
    return this.commands[cmd];
  };

  // lock/unlock interface
  this.set_busy = function(a, message, id)
  {
    if (a && message) {
      var msg = this.get_label(message);
      if (msg == message)
        msg = 'Loading...';

      id = this.display_message(msg, 'loading');
    }
    else if (!a && id) {
      this.hide_message(id);
    }

    this.busy = a;
    //document.body.style.cursor = a ? 'wait' : 'default';

    if (this.gui_objects.editform)
      this.lock_form(this.gui_objects.editform, a);

    return id;
  };

  // return a localized string
  this.get_label = function(name, domain)
  {
    if (domain && this.labels[domain+'.'+name])
      return this.labels[domain+'.'+name];
    else if (this.labels[name])
      return this.labels[name];
    else
      return name;
  };

  // alias for convenience reasons
  this.gettext = this.get_label;

  // switch to another application task
  this.switch_task = function(task)
  {
    if (this.task === task && task != 'mail')
      return;

    var url = this.get_task_url(task);

    if (task == 'mail')
      url += '&_mbox=INBOX';
    else if (task == 'logout' && !this.env.server_error)
      this.clear_compose_data();

    this.redirect(url);
  };

  this.get_task_url = function(task, url)
  {
    if (!url)
      url = this.env.comm_path;

    return url.replace(/_task=[a-z0-9_-]+/i, '_task='+task);
  };

  this.reload = function(delay)
  {
    if (this.is_framed())
      parent.rcmail.reload(delay);
    else if (delay)
      setTimeout(function() { ref.reload(); }, delay);
    else if (window.location)
      location.href = this.env.comm_path + (this.env.action ? '&_action='+this.env.action : '');
  };

  // Add variable to GET string, replace old value if exists
  this.add_url = function(url, name, value)
  {
    value = urlencode(value);

    if (/(\?.*)$/.test(url)) {
      var urldata = RegExp.$1,
        datax = RegExp('((\\?|&)'+RegExp.escape(name)+'=[^&]*)');

      if (datax.test(urldata)) {
        urldata = urldata.replace(datax, RegExp.$2 + name + '=' + value);
      }
      else
        urldata += '&' + name + '=' + value

      return url.replace(/(\?.*)$/, urldata);
    }

    return url + '?' + name + '=' + value;
  };

  this.is_framed = function()
  {
    return (this.env.framed && parent.rcmail && parent.rcmail != this && parent.rcmail.command);
  };

  this.save_pref = function(prop)
  {
    var request = {_name: prop.name, _value: prop.value};

    if (prop.session)
      request._session = prop.session;
    if (prop.env)
      this.env[prop.env] = prop.value;

    this.http_post('save-pref', req…