/*
 +-----------------------------------------------------------------------+
 | RoundCube Webmail Client Script                                       |
 |                                                                       |
 | This file is part of the RoundCube Webmail client                     |
 | Copyright (C) 2005, RoundCube Dev, - Switzerland                      |
 | Licensed under the GNU GPL                                            |
 |                                                                       |
 +-----------------------------------------------------------------------+
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 +-----------------------------------------------------------------------+
 
  $Id$
*/

// Constants
var CONTROL_KEY = 1;
var SHIFT_KEY = 2;
var CONTROL_SHIFT_KEY = 3;

var rcube_webmail_client;

function rcube_webmail()
  {
  this.env = new Object();
  this.labels = new Object();
  this.buttons = new Object();
  this.gui_objects = new Object();
  this.commands = new Object();
  this.selection = new Array();

  // create public reference to myself
  rcube_webmail_client = this;
  this.ref = 'rcube_webmail_client';
 
  // webmail client settings
  this.dblclick_time = 600;
  this.message_time = 5000;
  this.request_timeout = 180000;
  this.kepp_alive_interval = 60000;
  this.mbox_expression = new RegExp('[^0-9a-z\-_]', 'gi');
  this.env.blank_img = 'skins/default/images/blank.gif';
  
  // mimetypes supported by the browser (default settings)
  this.mimetypes = new Array('text/plain', 'text/html', 'text/xml',
                             'image/jpeg', 'image/gif', 'image/png',
                             'application/x-javascript', 'application/pdf',
                             'application/x-shockwave-flash');


  // set environment variable
  this.set_env = function(name, value)
    {
    //if (!this.busy)
      this.env[name] = value;    
    };


  // add a localized label to the client environment
  this.add_label = function(key, value)
    {
    this.labels[key] = value;
    };


  // add a button to the button list
  this.register_button = function(command, id, type, act, sel, over)
    {
    if (!this.buttons[command])
      this.buttons[command] = new Array();
      
    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;

    this.buttons[command][this.buttons[command].length] = button_prop;    
    };


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


  // initialize webmail client
  this.init = function()
    {
    this.task = this.env.task;
    
    // check browser
    if (!bw.dom || !bw.xmlhttp_test())
      {
      location.href = this.env.comm_path+'&_action=error&_code=0x199';
      return;
      }
    
    // find all registered gui objects
    for (var n in this.gui_objects)
      this.gui_objects[n] = rcube_find_object(this.gui_objects[n]);
      
    // tell parent window that this frame is loaded
    if (this.env.framed && parent.rcmail && parent.rcmail.set_busy)
      parent.rcmail.set_busy(false);

    // enable general commands
    this.enable_command('logout', 'mail', 'addressbook', 'settings', true);
    
    switch (this.task)
      {
      case 'mail':
        var msg_list_frame = this.gui_objects.mailcontframe;
        var msg_list = this.gui_objects.messagelist;
        if (msg_list)
          {
          msg_list_frame.onmousedown = function(e){return rcube_webmail_client.click_on_list(e);};
          this.init_messagelist(msg_list);
          this.enable_command('markread', true);
          }

        // enable mail commands
        this.enable_command('list', 'compose', 'add-contact', true);
        
        if (this.env.action=='show')
          {
          this.enable_command('show', 'reply', 'reply-all', 'forward', 'moveto', 'delete', 'viewsource', 'print', 'load-attachment', true);
          if (this.env.next_uid)
            this.enable_command('nextmessage', true);
          if (this.env.prev_uid)
            this.enable_command('previousmessage', true);
          }

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

        if (this.env.action=='compose')
          this.enable_command('add-attachment', 'send-attachment', 'send', true);
          
        if (this.env.messagecount)
          this.enable_command('select-all', 'select-none', 'sort', 'expunge', true);

        if (this.env.messagecount && this.env.mailbox==this.env.trash_mailbox)
          this.enable_command('purge', true);

        this.set_page_buttons();

        // focus this window
        window.focus();

        // init message compose form
        if (this.env.action=='compose')
          this.init_messageform();

        // show printing dialog
        if (this.env.action=='print')
          window.print();
          
        // get unread count for each mailbox
        if (this.gui_objects.mailboxlist)
          this.http_request('getunread', '');

        break;


      case 'addressbook':
        var contacts_list      = this.gui_objects.contactslist;
        var ldap_contacts_list = this.gui_objects.ldapcontactslist;

        if (contacts_list)
          this.init_contactslist(contacts_list);
      
        if (ldap_contacts_list)
          this.init_ldapsearchlist(ldap_contacts_list);

        this.set_page_buttons();
          
        if (this.env.cid)
          this.enable_command('show', 'edit', true);

        if ((this.env.action=='add' || this.env.action=='edit') && this.gui_objects.editform)
          this.enable_command('save', true);
      
        this.enable_command('list', 'add', true);

        this.enable_command('ldappublicsearch', this.env.ldappublicsearch);

        break;


      case 'settings':
        this.enable_command('preferences', 'identities', 'save', 'folders', true);
        
        if (this.env.action=='identities' || this.env.action=='edit-identity' || this.env.action=='add-identity')
          this.enable_command('edit', 'add', 'delete', true);

        if (this.env.action=='edit-identity' || this.env.action=='add-identity')
          this.enable_command('save', true);
          
        if (this.env.action=='folders')
          this.enable_command('subscribe', 'unsubscribe', 'create-folder', 'delete-folder', true);
          
        var identities_list = this.gui_objects.identitieslist;
        if (identities_list)
          this.init_identitieslist(identities_list);

        break;

      case 'login':
        var input_user = rcube_find_object('_user');
        var input_pass = rcube_find_object('_pass');
        if (input_user && input_user.value=='')
          input_user.focus();
        else if (input_pass)
          input_pass.focus();
          
        this.enable_command('login', true);
        break;
      
      default:
        break;
      }


    // enable basic commands
    this.enable_command('logout', true);

    // disable browser's contextmenus
    document.oncontextmenu = function(){ return false; }

    // load body click event
    document.onmousedown = function(){ return rcube_webmail_client.reset_click(); };
    document.onkeydown   = function(e){ return rcube_webmail_client.use_arrow_keys(e, msg_list_frame); };

    
    // flag object as complete
    this.loaded = true;
          
    // show message
    if (this.pending_message)
      this.display_message(this.pending_message[0], this.pending_message[1]);
      
    // start interval for keep-alive/recent_check signal
    if (this.kepp_alive_interval && this.task=='mail' && this.gui_objects.messagelist)
      this.kepp_alive_int = setInterval(this.ref+'.check_for_recent()', this.kepp_alive_interval);
    else
      this.kepp_alive_int = setInterval(this.ref+'.send_keep_alive()', this.kepp_alive_interval);
    };

  // reset last clicked if user clicks on anything other than the message table
  this.reset_click = function()
    {
	this.in_message_list = false;
	};
	
  this.click_on_list = function(e)
    {
    if (!e)
      e = window.event;

    this.in_message_list = true;
    e.cancelBubble = true;
    };

  // reset last clicked if user clicks on anything other than the message table
  this.use_arrow_keys = function(e, msg_list_frame) {
    if (this.in_message_list != true) 
      return true;

    var keyCode = document.layers ? e.which : document.all ? event.keyCode : document.getElementById ? e.keyCode : 0;
    var mod_key = this.get_modifier(e);
    var scroll_to = 0;

    var last_selected_row = this.list_rows[this.last_selected];

    if (keyCode == 40) { // down arrow key pressed
      var new_row = last_selected_row.obj.nextSibling;
      while (new_row && new_row.nodeType != 1) {
        new_row = new_row.nextSibling;
      }
      if (!new_row) return false;
      scroll_to = (Number(new_row.offsetTop) + Number(new_row.offsetHeight)) - Number(msg_list_frame.offsetHeight);
    } else if (keyCode == 38) { // up arrow key pressed
      var new_row = last_selected_row.obj.previousSibling;
      while (new_row && new_row.nodeType != 1) {
        new_row = new_row.previousSibling;
      }
      if (!new_row) return false;
      scroll_to = new_row.offsetTop;
    } else {return true;}
	
	if (mod_key != CONTROL_KEY)
	  this.select_row(new_row.uid,mod_key);

    if (((Number(new_row.offsetTop)) < (Number(msg_list_frame.scrollTop))) || 
       ((Number(new_row.offsetTop) + Number(new_row.offsetHeight)) > (Number(msg_list_frame.scrollTop) + Number(msg_list_frame.offsetHeight)))) {
      msg_list_frame.scrollTop = scroll_to;
    }

    return false;
  };

  // get all message rows from HTML table and init each row
  this.init_messagelist = function(msg_list)
    {
    if (msg_list && msg_list.tBodies[0])
      {
		  
      this.message_rows = new Array();

      var row;
      for(var r=0; r<msg_list.tBodies[0].childNodes.length; r++)
        {
        row = msg_list.tBodies[0].childNodes[r];
        //row = msg_list.tBodies[0].rows[r];
        this.init_message_row(row);
        }
      }
      
    // alias to common rows array
    this.list_rows = this.message_rows;
    };
    
    
  // make references in internal array and set event handlers
  this.init_message_row = function(row)
    {
    var uid, msg_icon;
    
    if (String(row.id).match(/rcmrow([0-9]+)/))
      {
      uid = RegExp.$1;
      row.uid = uid;
              
      this.message_rows[uid] = {id:row.id, obj:row,
                                classname:row.className,
                                unread:this.env.messages[uid] ? this.env.messages[uid].unread : null,
                                replied:this.env.messages[uid] ? this.env.messages[uid].replied : null};
              
      // set eventhandlers to table row
      row.onmousedown = function(e){ return rcube_webmail_client.drag_row(e, this.uid); };
      row.onmouseup = function(e){ return rcube_webmail_client.click_row(e, this.uid); };

      if (document.all)
        row.onselectstart = function() { return false; };

      // set eventhandler to message icon
      if ((msg_icon = row.cells[0].childNodes[0]) && row.cells[0].childNodes[0].nodeName=='IMG')
        {                
        msg_icon.id = 'msgicn_'+uid;
        msg_icon._row = row;
        msg_icon.onmousedown = function(e) { rcube_webmail_client.command('markread', this); };
                
        // get message icon and save original icon src
        this.message_rows[uid].icon = msg_icon;
        }
      }
    };


  // init message compose form: set focus and eventhandlers
  this.init_messageform = function()
    {
    if (!this.gui_objects.messageform)
      return false;
    
    //this.messageform = this.gui_objects.messageform;
    var input_from = rcube_find_object('_from');
    var input_to = rcube_find_object('_to');
    var input_cc = rcube_find_object('_cc');
    var input_bcc = rcube_find_object('_bcc');
    var input_replyto = rcube_find_object('_replyto');
    var input_subject = rcube_find_object('_subject');
    var input_message = rcube_find_object('_message');
    
    // init live search events
    if (input_to)
      this.init_address_input_events(input_to);
    if (input_cc)
      this.init_address_input_events(input_cc);
    if (input_bcc)
      this.init_address_input_events(input_bcc);
      
    // add signature according to selected identity
    if (input_from && input_from.type=='select-one')
      this.change_identity(input_from);

    if (input_to && input_to.value=='')
      input_to.focus();
    else if (input_subject && input_subject.value=='')
      input_subject.focus();
    else if (input_message)
      this.set_caret2start(input_message); // input_message.focus();
    
    // get summary of all field values
    this.cmp_hash = this.compose_field_hash();
    };


  this.init_address_input_events = function(obj)
    {
    var handler = function(e){ return rcube_webmail_client.ksearch_keypress(e,this); };
    var handler2 = function(e){ return rcube_webmail_client.ksearch_blur(e,this); };
	
    if (bw.safari)
      {
      obj.addEventListener('keydown', handler, false);
      // obj.addEventListener('blur', handler2, false);
      }
    else if (bw.mz)
      {
      obj.addEventListener('keypress', handler, false);
      obj.addEventListener('blur', handler2, false);
      }
    else if (bw.ie)
      {
      obj.onkeydown = handler;
      //obj.attachEvent('onkeydown', handler);
      // obj.attachEvent('onblur', handler2, false);
      }
	
    obj.setAttribute('autocomplete', 'off');       
    };



  // get all contact rows from HTML table and init each row
  this.init_contactslist = function(contacts_list)
    {
    if (contacts_list && contacts_list.tBodies[0])
      {
      this.contact_rows = new Array();

      var row;
      for(var r=0; r<contacts_list.tBodies[0].childNodes.length; r++)
        {
        row = contacts_list.tBodies[0].childNodes[r];
        this.init_table_row(row, 'contact_rows');
        }
      }

    // alias to common rows array
    this.list_rows = this.contact_rows;
    
    if (this.env.cid)
      this.highlight_row(this.env.cid);
    };


  // get all contact rows from HTML table and init each row
  this.init_ldapsearchlist = function(ldap_contacts_list)
    {
    if (ldap_contacts_list && ldap_contacts_list.tBodies[0])
      {
      this.ldap_contact_rows = new Array();

      var row;
      for(var r=0; r<ldap_contacts_list.tBodies[0].childNodes.length; r++)
        {
        row = ldap_contacts_list.tBodies[0].childNodes[r];
        this.init_table_row(row, 'ldap_contact_rows');
        }
      }

    // alias to common rows array
    this.list_rows = this.ldap_contact_rows;
    };


  // make references in internal array and set event handlers
  this.init_table_row = function(row, array_name)
    {
    var cid;
    
    if (String(row.id).match(/rcmrow([0-9]+)/))
      {
      cid = RegExp.$1;
      row.cid = cid;

      this[array_name][cid] = {id:row.id,
                               obj:row,
                               classname:row.className};

      // set eventhandlers to table row
      row.onmousedown = function(e) { rcube_webmail_client.in_selection_before=this.cid; return false; };  // fake for drag handler
      row.onmouseup = function(e){ return rcube_webmail_client.click_row(e, this.cid); };
      }
    };


  // get all contact rows from HTML table and init each row
  this.init_identitieslist = function(identities_list)
    {
    if (identities_list && identities_list.tBodies[0])
      {
      this.identity_rows = new Array();

      var row;
      for(var r=0; r<identities_list.tBodies[0].childNodes.length; r++)
        {
        row = identities_list.tBodies[0].childNodes[r];
        this.init_table_row(row, 'identity_rows');
        }
      }

    // alias to common rows array
    this.list_rows = this.identity_rows;
    
    if (this.env.iid)
      this.highlight_row(this.env.iid);    
    };
    


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


  // execute a specific command on the web client
  this.command = function(command, props, obj)
    {
    if (obj && obj.blur)
      obj.blur();

    if (this.busy)
      return false;

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

      return false;
      }
      
      
   // check input before leaving compose step
   if (this.task=='mail' && this.env.action=='compose' && (command=='list' || command=='mail' || command=='addressbook' || command=='settings'))
     {
     if (this.cmp_hash != this.compose_field_hash() && !confirm(this.get_label('notsentwarning')))
        return false;
     }


    // process command
    switch (command)
      {
      case 'login':
        if (this.gui_objects.loginform)
          this.gui_objects.loginform.submit();
        break;

      case 'logout':
        location.href = this.env.comm_path+'&_action=logout';
        break;      

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


      // misc list commands
      case 'list':
        if (this.task=='mail')
          this.list_mailbox(props);
        else if (this.task=='addressbook')
          this.list_contacts();
        break;

      case 'sort':
        // get the type of sorting
        var a_sort = props.split('_');
        var sort_col = a_sort[0];
        var sort_order = a_sort[1] ? a_sort[1].toUpperCase() : null;
        var header;
        
        // no sort order specified: toggle
        if (sort_order==null)
          {
          if (this.env.sort_col==sort_col)
            sort_order = this.env.sort_order=='ASC' ? 'DESC' : 'ASC';
          else
            sort_order = this.env.sort_order;
          }
        
        if (this.env.sort_col==sort_col && this.env.sort_order==sort_order)
          break;

        // set table header class
        if (header = document.getElementById('rcmHead'+this.env.sort_col))
          this.set_classname(header, 'sorted'+(this.env.sort_order.toUpperCase()), false);
        if (header = document.getElementById('rcmHead'+sort_col))
          this.set_classname(header, 'sorted'+sort_order, true);

        // save new sort properties
        this.env.sort_col = sort_col;
        this.env.sort_order = sort_order;

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

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

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

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

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


      // common commands used in multiple tasks
      case 'show':
        if (this.task=='mail')
          {
          var uid = this.get_single_uid();
          if (uid && (!this.env.uid || uid != this.env.uid))
            this.show_message(uid);
          }
        else if (this.task=='addressbook')
          {
          var 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')
          if (!window.frames[this.env.contentframe].rcmail)
            this.load_contact(0, 'add');
          else
            {
            if (window.frames[this.env.contentframe].rcmail.selection.length)
              this.add_ldap_contacts();
            else
              this.load_contact(0, 'add');
            }
        else if (this.task=='settings')
          {
          this.clear_selection();
          this.load_identity(0, 'add-identity');
          }
        break;

      case 'edit':
        var cid;
        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');
        break;

      case 'save-identity':
      case 'save':
        if (this.gui_objects.editform)
          {
          var input_pagesize = rcube_find_object('_pagesize');
          var input_name  = rcube_find_object('_name');
          var input_email = rcube_find_object('_email');

          // user prefs
          if (input_pagesize && isNaN(input_pagesize.value))
            {
            alert(this.get_label('nopagesizewarning'));
            input_pagesize.focus();
            break;
            }
          // contacts/identities
          else
            {
            if (input_name && input_name.value == '')
              {
              alert(this.get_label('nonamewarning'));
              input_name.focus();
              break;
              }
            else if (input_email && !rcube_check_email(input_email.value))
              {
              alert(this.get_label('noemailwarning'));
              input_email.focus();
              break;
              }
            }

          this.gui_objects.editform.submit();
          }
        break;

      case 'delete':
        // mail task
        if (this.task=='mail' && this.env.trash_mailbox && String(this.env.mailbox).toLowerCase()!=String(this.env.trash_mailbox).toLowerCase())
          this.move_messages(this.env.trash_mailbox);
        else if (this.task=='mail')
          this.delete_messages();
        // addressbook task
        else if (this.task=='addressbook')
          this.delete_contacts();
        // user settings task
        else if (this.task=='settings')
          this.delete_identity();
        break;


      // mail task commands
      case 'move':
      case 'moveto':
        this.move_messages(props);
        break;
        
      case 'markread':
        if (props && !props._row)
          break;
        
        var uid;
        var flag = 'read';
        
        if (props._row.uid)
          {
          uid = props._row.uid;
          this.dont_select = true;
          
          // toggle read/unread
          if (!this.message_rows[uid].unread)
            flag = 'unread';
          }
          
        this.mark_message(flag, uid);
        break;
        
      case 'load-images':
        if (this.env.uid)
          this.show_message(this.env.uid, true);
        break;

      case 'load-attachment':
        var url = this.env.comm_path+'&_action=get&_mbox='+this.env.mailbox+'&_uid='+this.env.uid+'&_part='+props.part;
        
        // open attachment in frame if it's of a supported mimetype
        if (this.env.uid && props.mimetype && find_in_array(props.mimetype, this.mimetypes)>=0)
          {
          this.attachment_win = window.open(url+'&_frame=1', 'rcubemailattachment');
          if (this.attachment_win)
            {
            setTimeout(this.ref+'.attachment_win.focus()', 10);
            break;
            }
          }

        location.href = url;
        break;
        
      case 'select-all':
        this.select_all(props);
        break;

      case 'select-none':
        this.clear_selection();
        break;

      case 'nextmessage':
        if (this.env.next_uid)
          this.show_message(this.env.next_uid);
          //location.href = this.env.comm_path+'&_action=show&_uid='+this.env.next_uid+'&_mbox='+this.env.mailbox;
        break;

      case 'previousmessage':
        if (this.env.prev_uid)
          this.show_message(this.env.prev_uid);
          //location.href = this.env.comm_path+'&_action=show&_uid='+this.env.prev_uid+'&_mbox='+this.env.mailbox;
        break;
      
      
      case 'compose':
        var url = this.env.comm_path+'&_action=compose';
        
        // modify url if we're in addressbook
        if (this.task=='addressbook')
          {
          url = this.get_task_url('mail', url);            
          var a_cids = new Array();
          
          // use contact_id passed as command parameter
          if (props)
            a_cids[a_cids.length] = props;
            
          // get selected contacts
          else
            {
            if (!window.frames[this.env.contentframe].rcmail.selection.length)
              {
              for (var n=0; n<this.selection.length; n++)
                a_cids[a_cids.length] = this.selection[n];
              }
            else
              {
              var frameRcmail = window.frames[this.env.contentframe].rcmail;
              // get the email address(es)
              for (var n=0; n<frameRcmail.selection.length; n++)
                a_cids[a_cids.length] = frameRcmail.ldap_contact_rows[frameRcmail.selection[n]].obj.cells[1].innerHTML;
              }
            }
          if (a_cids.length)
            url += '&_to='+a_cids.join(',');
          else
            break;
            
          }
        else if (props)
           url += '&_to='+props;
        
        // don't know if this is necessary...
        url = url.replace(/&_framed=1/, "");

        this.set_busy(true);

        // need parent in case we are coming from the contact frame
        parent.window.location.href = url;
        break;    

      case 'send':
        if (!this.gui_objects.messageform)
          break;
          
        if (!this.check_compose_input())
          break;

        // all checks passed, send message
        this.set_busy(true, 'sendingmessage');
        var form = this.gui_objects.messageform;
        form.submit();
        break;

      case 'add-attachment':
        this.show_attachment_form(true);
        
      case 'send-attachment':
        this.upload_file(props)      
        break;

      case 'reply-all':
      case 'reply':
        var uid;
        if (uid = this.get_single_uid())
          {
          this.set_busy(true);
          location.href = this.env.comm_path+'&_action=compose&_reply_uid='+uid+'&_mbox='+escape(this.env.mailbox)+(command=='reply-all' ? '&_all=1' : '');
          }
        break;      

      case 'forward':
        var uid;
        if (uid = this.get_single_uid())
          {
          this.set_busy(true);
          location.href = this.env.comm_path+'&_action=compose&_forward_uid='+uid+'&_mbox='+escape(this.env.mailbox);
          }
        break;
        
      case 'print':
        var uid;
        if (uid = this.get_single_uid())
          {
          this.printwin = window.open(this.env.comm_path+'&_action=print&_uid='+uid+'&_mbox='+escape(this.env.mailbox)+(this.env.safemode ? '&_safe=1' : ''));
          if (this.printwin)
            setTimeout(this.ref+'.printwin.focus()', 20);
          }
        break;

      case 'viewsource':
        var uid;
        if (uid = this.get_single_uid())
          {          
          this.sourcewin = window.open(this.env.comm_path+'&_action=viewsource&_uid='+this.env.uid+'&_mbox='+escape(this.env.mailbox));
          if (this.sourcewin)
            setTimeout(this.ref+'.sourcewin.focus()', 20);
          }
        break;

      case 'add-contact':
        this.add_contact(props);
        break;
      

      // ldap search
      case 'ldappublicsearch':
        if (this.gui_objects.ldappublicsearchform) 
          this.gui_objects.ldappublicsearchform.submit();
        else 
          this.ldappublicsearch(command);
        break; 


      // user settings commands
      case 'preferences':
        location.href = this.env.comm_path;
        break;

      case 'identities':
        location.href = this.env.comm_path+'&_action=identities';
        break;
          
      case 'delete-identity':
        this.delete_identity();
        
      case 'folders':
        location.href = this.env.comm_path+'&_action=folders';
        break;

      case 'subscribe':
        this.subscribe_folder(props);
        break;

      case 'unsubscribe':
        this.unsubscribe_folder(props);
        break;
        
      case 'create-folder':
        this.create_folder(props);
        break;

      case 'delete-folder':
        if (confirm(this.get_label('deletefolderconfirm')))
          this.delete_folder(props);
        break;

      }

    return obj ? false : true;
    };


  // set command enabled or disabled
  this.enable_command = function()
    {
    var args = this.enable_command.arguments;
    if(!args.length) return -1;

    var command;
    var enable = args[args.length-1];
    
    for(var n=0; n<args.length-1; n++)
      {
      command = args[n];
      this.commands[command] = enable;
      this.set_button(command, (enable ? 'act' : 'pas'));
      }
    };


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

      this.display_message(msg, 'loading', true);
      }
    else if (!a && this.busy)
      this.hide_message();

    this.busy = a;
    //document.body.style.cursor = a ? 'wait' : 'default';
    
    if (this.gui_objects.editform)
      this.lock_form(this.gui_objects.editform, a);
      
    // clear pending timer
    if (this.request_timer)
      clearTimeout(this.request_timer);

    // set timer for requests
    if (a && this.request_timeout)
      this.request_timer = setTimeout(this.ref+'.request_timed_out()', this.request_timeout);
    };


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


  // 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';

    this.set_busy(true);
    location.href = url;
    };


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

    return url.replace(/_task=[a-z]+/, '_task='+task);
    };
    
  
  // called when a request timed out
  this.request_timed_out = function()
    {
    this.set_busy(false);
    this.display_message('Request timed out!', 'error');
    };


  /*********************************************************/
  /*********        event handling methods         *********/
  /*********************************************************/


  // onmouseup handler for mailboxlist item
  this.mbox_mouse_up = function(mbox)
    {
    if (this.drag_active)
      this.command('moveto', mbox);
    else
      this.command('list', mbox);
      
    return false;
    };


  // onmousedown-handler of message list row
  this.drag_row = function(e, id)
    {
    this.in_selection_before = this.in_selection(id) ? id : false;

    // don't do anything (another action processed before)
    if (this.dont_select)
      return false;

    // selects currently unselected row
    if (!this.in_selection_before)
    {
	  var mod_key = this.get_modifier(e);
	  this.select_row(id,mod_key);
    }
    
    if (this.selection.length)
      {
      this.drag_start = true;
      document.onmousemove = function(e){ return rcube_webmail_client.drag_mouse_move(e); };
      document.onmouseup = function(e){ return rcube_webmail_client.drag_mouse_up(e); };
      }

    return false;
    };


  // onmouseup-handler of message list row
  this.click_row = function(e, id)
    {

    // don't do anything (another action processed before)
    if (this.dont_select)
      {
      this.dont_select = false;
      return false;
      }
    
    // unselects currently selected row    
    if (!this.drag_active && this.in_selection_before==id) {
      var mod_key = this.get_modifier(e);
      this.select_row(id,mod_key);
    }
    this.drag_start = false;
    this.in_selection_before = false;
        
    // row was double clicked
    if (this.task=='mail' && this.list_rows && this.list_rows[id].clicked)
      {
      this.show_message(id);
      return false;
      }
    else if (this.task=='addressbook')
      {
      if (this.contact_rows && this.selection.length==1)
        {
        this.load_contact(this.selection[0], 'show', true);
        // change the text for the add contact button
        var links = parent.document.getElementById('abooktoolbar').getElementsByTagName('A');
        for (i = 0; i < links.length; i++)
          {
          var onclickstring = new String(links[i].onclick);
          if (onclickstring.search('\"add\"') != -1)
            links[i].title = this.env.newcontact;
          }
        }
      else if (this.contact_rows && this.contact_rows[id].clicked)
        {
        this.load_contact(id, 'show');
        return false;
        }
      else if (this.ldap_contact_rows && !this.ldap_contact_rows[id].clicked)
        {
        // clear selection
        parent.rcmail.clear_selection();

        // disable delete
        parent.rcmail.set_button('delete', 'pas');

        // change the text for the add contact button
        var links = parent.document.getElementById('abooktoolbar').getElementsByTagName('A');
        for (i = 0; i < links.length; i++)
          {
          var onclickstring = new String(links[i].onclick);
          if (onclickstring.search('\"add\"') != -1)
            links[i].title = this.env.addcontact;
          }
        }
      // handle double click event
      else if (this.ldap_contact_rows && this.selection.length==1 && this.ldap_contact_rows[id].clicked)
        this.command('compose', this.ldap_contact_rows[id].obj.cells[1].innerHTML);
      else if (this.env.contentframe)
        {
        var elm = document.getElementById(this.env.contentframe);
        elm.style.visibility = 'hidden';
        }
      }
    else if (this.task=='settings')
      {
      if (this.selection.length==1)
        this.command('edit', this.selection[0]);
      }

    this.list_rows[id].clicked = true;
    setTimeout(this.ref+'.list_rows['+id+'].clicked=false;', this.dblclick_time);
      
    return false;
    };



  /*********************************************************/
  /*********     (message) list functionality      *********/
  /*********************************************************/

  // highlight/unhighlight a row
  this.highlight_row = function(id, multiple)
    {
    var selected = false
    
    if (this.list_rows[id] && !multiple)
      {
      this.clear_selection();
      this.selection[0] = id;
      this.list_rows[id].obj.className += ' selected';
      selected = true;
      }
    
    else if (this.list_rows[id])
      {
      if (!this.in_selection(id))  // select row
        {
        this.selection[this.selection.length] = id;
        this.set_classname(this.list_rows[id].obj, 'selected', true);        
        }
      else  // unselect row
        {
        var p = find_in_array(id, this.selection);
        var a_pre = this.selection.slice(0, p);
        var a_post = this.selection.slice(p+1, this.selection.length);
        this.selection = a_pre.concat(a_post);
        this.set_classname(this.list_rows[id].obj, 'selected', false);
        }
      selected = (this.selection.length==1);
      }

    // enable/disable commands for message
    if (this.task=='mail')
      {
      this.enable_command('show', 'reply', 'reply-all', 'forward', 'print', selected);
      this.enable_command('delete', 'moveto', this.selection.length>0 ? true : false);
      }
    else if (this.task=='addressbook')
      {
      this.enable_command('edit', /*'print',*/ selected);
      this.enable_command('delete', 'compose', this.selection.length>0 ? true : false);
      }
    };


// selects or unselects the proper row depending on the modifier key pressed
  this.select_row = function(id,mod_key)  { 
  	if (!mod_key) {
      this.shift_start = id;
  	  this.highlight_row(id, false);
    } else {
      switch (mod_key) {
        case SHIFT_KEY: { 
          this.shift_select(id,false); 
          break; }
        case CONTROL_KEY: { 
          this.shift_start = id;
          this.highlight_row(id, true); 
          break; 
          }
        case CONTROL_SHIFT_KEY: { 
          this.shift_select(id,true);
          break;
          }
        default: {
          this.highlight_row(id, false); 
          break;
          }
      }
	}
	this.last_selected = id;
  };

  this.shift_select = function(id, control) {
    var from_rowIndex = this.list_rows[this.shift_start].obj.rowIndex;
    var to_rowIndex = this.list_rows[id].obj.rowIndex;
        
    var i = ((from_rowIndex < to_rowIndex)? from_rowIndex : to_rowIndex);
    var j = ((from_rowIndex > to_rowIndex)? from_rowIndex : to_rowIndex);
    
	// iterate through the entire message list
    for (var n in this.list_rows) {
      if ((this.list_rows[n].obj.rowIndex >= i) && (this.list_rows[n].obj.rowIndex <= j)) {
        if (!this.in_selection(n))
          this.highlight_row(n, true);
      } else {
        if  (this.in_selection(n) && !control)
          this.highlight_row(n, true);
      }
    }
  };
  

  this.clear_selection = function()
    {
    for(var n=0; n<this.selection.length; n++)
      if (this.list_rows[this.selection[n]])
        this.set_classname(this.list_rows[this.selection[n]].obj, 'selected', false);

    this.selection = new Array();    
    };


  // check if given id is part of the current selection
  this.in_selection = function(id)
    {
    for(var n in this.selection)
      if (this.selection[n]==id)
        return true;

    return false;    
    };


  // select each row in list
  this.select_all = function(filter)
    {
    if (!this.list_rows || !this.list_rows.length)
      return false;
      
    // reset selection first
    this.clear_selection();
    
    for (var n in this.list_rows)
      if (!filter || this.list_rows[n][filter]==true)
      this.highlight_row(n, true);
    };
    

  // when user doble-clicks on a row
  this.show_message = function(id, safe)
    {
    var add_url = '';
    var target = window;
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe])
      {
      target = window.frames[this.env.contentframe];
      add_url = '&_framed=1';
      }
      
    if (safe)
      add_url = '&_safe=1';

    if (id)
      {
      this.set_busy(true, 'loading');
      target.location.href = this.env.comm_path+'&_action=show&_uid='+id+'&_mbox='+escape(this.env.mailbox)+add_url;
      }
    };



  // list a specific page
  this.list_page = function(page)
    {
    if (page=='next')
      page = this.env.current_page+1;
    if (page=='prev' && this.env.current_page>1)
      page = this.env.current_page-1;
      
    if (page > 0 && page <= this.env.pagecount)
      {
      this.env.current_page = page;
      
      if (this.task=='mail')
        this.list_mailbox(this.env.mailbox, page);
      else if (this.task=='addressbook')
        this.list_contacts(page);
      }
    };


  // list messages of a specific mailbox
  this.list_mailbox = function(mbox, page, sort)
    {
    var add_url = '';
    var target = window;

    if (!mbox)
      mbox = this.env.mailbox;

    // add sort to url if set
    if (sort)
      add_url += '&_sort=' + sort;
      
    // set page=1 if changeing to another mailbox
    if (!page && mbox != this.env.mailbox)
      {
      page = 1;
      add_url += '&_refresh=1';
      this.env.current_page = page;
      this.clear_selection();
      }
      
    if (this.env.mailbox!=mbox)
      this.select_mailbox(mbox);

    // load message list remotely
    if (this.gui_objects.messagelist)
      {
      this.list_mailbox_remote(mbox, page, add_url);
      return;
      }
    
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe])
      {
      target = window.frames[this.env.contentframe];
      add_url += '&_framed=1';
      }

    // load message list to target frame/window
    if (mbox)
      {
      this.set_busy(true, 'loading');
      target.location.href = this.env.comm_path+'&_mbox='+escape(mbox)+(page ? '&_page='+page : '')+add_url;
      }
    };


  // send remote request to load message list
  this.list_mailbox_remote = function(mbox, page, add_url)
    {
    // clear message list first
    this.clear_message_list();

    // send request to server
    var url = '_mbox='+escape(mbox)+(page ? '&_page='+page : '');
    this.set_busy(true, 'loading');
    this.http_request('list', url+add_url, true);
    };


  this.clear_message_list = function()
    {
    var table = this.gui_objects.messagelist;
    var tbody = document.createElement('TBODY');
    table.insertBefore(tbody, table.tBodies[0]);
    table.removeChild(table.tBodies[1]);
    
    this.message_rows = new Array();
    this.list_rows = this.message_rows;
    
    };


  this.expunge_mailbox = function(mbox)
    {
    var lock = false;
    var add_url = '';
    
    // lock interface if it's the active mailbox
    if (mbox == this.env.mailbox)
       {
       lock = true;
       this.set_busy(true, 'loading');
       add_url = '&_reload=1';
       }

    // send request to server
    var url = '_mbox='+escape(mbox);
    this.http_request('expunge', url+add_url, lock);
    };


  this.purge_mailbox = function(mbox)
    {
    var lock = false;
    var add_url = '';
    
    if (!confirm(this.get_label('purgefolderconfirm')))
      return false;
    
    // lock interface if it's the active mailbox
    if (mbox == this.env.mailbox)
       {
       lock = true;
       this.set_busy(true, 'loading');
       add_url = '&_reload=1';
       }

    // send request to server
    var url = '_mbox='+escape(mbox);
    this.http_request('purge', url+add_url, lock);
    };
    

  // move selected messages to the specified mailbox
  this.move_messages = function(mbox)
    {
    // exit if no mailbox specified or if selection is empty
    if (!mbox || !(this.selection.length || this.env.uid) || mbox==this.env.mailbox)
      return;
    
    var a_uids = new Array();

    if (this.env.uid)
      a_uids[a_uids.length] = this.env.uid;
    else
      {
      var id;
      for (var n=0; n<this.selection.length; n++)
        {
        id = this.selection[n];
        a_uids[a_uids.length] = id;
      
        // 'remove' message row from list (just hide it)
        if (this.message_rows[id].obj)
          this.message_rows[id].obj.style.display = 'none';
        }
      }
      
    var lock = false;

    // show wait message
    if (this.env.action=='show')
      {
      lock = true;
      this.set_busy(true, 'movingmessage');
      }

    // send request to server
    this.http_request('moveto', '_uid='+a_uids.join(',')+'&_mbox='+escape(this.env.mailbox)+'&_target_mbox='+escape(mbox)+'&_from='+(this.env.action ? this.env.action : ''), lock);
    };


  // delete selected messages from the current mailbox
  this.delete_messages = function()
    {
    // exit if no mailbox specified or if selection is empty
    if (!(this.selection.length || this.env.uid))
      return;
    
    var a_uids = new Array();

    if (this.env.uid)
      a_uids[a_uids.length] = this.env.uid;
    else
      {
      var id;
      for (var n=0; n<this.selection.length; n++)
        {
        id = this.selection[n];
        a_uids[a_uids.length] = id;
      
        // 'remove' message row from list (just hide it)
        if (this.message_rows[id].obj)
          this.message_rows[id].obj.style.display = 'none';
        }
      }

    // send request to server
    this.http_request('delete', '_uid='+a_uids.join(',')+'&_mbox='+escape(this.env.mailbox)+'&_from='+(this.env.action ? this.env.action : ''));
    };


  // set a specific flag to one or more messages
  this.mark_message = function(flag, uid)
    {
    var a_uids = new Array();
    
    if (uid)
      a_uids[0] = uid;
    else if (this.env.uid)
      a_uids[0] = this.env.uid;
    else
      {
      var id;
      for (var n=0; n<this.selection.length; n++)
        {
        id = this.selection[n];
        a_uids[a_uids.length] = id;
      
        // 'remove' message row from list (just hide it)
        if (this.message_rows[id].obj)
          this.message_rows[id].obj.style.display = 'none';
        }
      }

    // mark all message rows as read/unread
    var icn_src;
    for (var i=0; i<a_uids.length; i++)
      {
      uid = a_uids[i];
      if (this.message_rows[uid])
        {
        this.message_rows[uid].unread = (flag=='unread' ? true : false);
        
        if (this.message_rows[uid].classname.indexOf('unread')<0 && this.message_rows[uid].unread)
          {
          this.message_rows[uid].classname += ' unread';
          this.set_classname(this.message_rows[uid].obj, 'unread', true);

          if (this.env.unreadicon)
            icn_src = this.env.unreadicon;
          }
        else if (!this.message_rows[uid].unread)
          {
          this.message_rows[uid].classname = this.message_rows[uid].classname.replace(/\s*unread/, '');
          this.set_classname(this.message_rows[uid].obj, 'unread', false);

          if (this.message_rows[uid].replied && this.env.repliedicon)
            icn_src = this.env.repliedicon;
          else if (this.env.messageicon)
            icn_src = this.env.messageicon;
          }

        if (this.message_rows[uid].icon && icn_src)
          this.message_rows[uid].icon.src = icn_src;
        }
      }

    // send request to server
    this.http_request('mark', '_uid='+a_uids.join(',')+'&_flag='+flag);
    };



  /*********************************************************/
  /*********        message compose methods        *********/
  /*********************************************************/
  
  
  // checks the input fields before sending a message
  this.check_compose_input = function()
    {
    // check input fields
    var input_to = rcube_find_object('_to');
    var input_subject = rcube_find_object('_subject');
    var input_message = rcube_find_object('_message');

    // check for empty recipient
    if (input_to && !rcube_check_email(input_to.value, true))
      {
      alert(this.get_label('norecipientwarning'));
      input_to.focus();
      return false;
      }

    // display localized warning for missing subject
    if (input_subject && input_subject.value == '')
      {
      var subject = prompt(this.get_label('nosubjectwarning'), this.get_label('nosubject'));

      // user hit cancel, so don't send
      if (!subject && subject !== '')
        {
        input_subject.focus();
        return false;
        }
      else
        {
        input_subject.value = subject ? subject : this.get_label('nosubject');            
        }
      }

    // check for empty body
    if (input_message.value=='')
      {
      if (!confirm(this.get_label('nobodywarning')))
        {
        input_message.focus();
        return false;
        }
      }

    return true;
    };
    
    
  this.compose_field_hash = function()
    {
    // check input fields
    var input_to = rcube_find_object('_to');
    var input_cc = rcube_find_object('_to');
    var input_bcc = rcube_find_object('_to');
    var input_subject = rcube_find_object('_subject');
    var input_message = rcube_find_object('_message');
    
    var str = '';
    if (input_to && input_to.value)
      str += input_to.value+':';
    if (input_cc && input_cc.value)
      str += input_cc.value+':';
    if (input_bcc && input_bcc.value)
      str += input_bcc.value+':';
    if (input_subject && input_subject.value)
      str += input_subject.value+':';
    if (input_message && input_message.value)
      str += input_message.value;

    return str;
    };
    
  
  this.change_identity = function(obj)
    {
    if (!obj || !obj.options)
      return false;

    var id = obj.options[obj.selectedIndex].value;
    var input_message = rcube_find_object('_message');
    var message = input_message ? input_message.value : '';
    var sig, p;

    // remove the 'old' signature
    if (this.env.identity && this.env.signatures && this.env.signatures[this.env.identity])
      {
      sig = this.env.signatures[this.env.identity];
      if (sig.indexOf('-- ')!=0)
        sig = '-- \n'+sig;

      p = message.lastIndexOf(sig);
      if (p>=0)
        message = message.substring(0, p-1) + message.substring(p+sig.length, message.length);
      }

    // add the new signature string
    if (this.env.signatures && this.env.signatures[id])
      {
      sig = this.env.signatures[id];
      if (sig.indexOf('-- ')!=0)
        sig = '-- \n'+sig;
      message += '\n'+sig;
      }

    if (input_message)
      input_message.value = message;
      
    this.env.identity = id;
    };


  this.show_attachment_form = function(a)
    {
    if (!this.gui_objects.uploadbox)
      return false;
      
    var elm, list;
    if (elm = this.gui_objects.uploadbox)
      {
      if (a &&  (list = this.gui_objects.attachmentlist))
        {
        var pos = rcube_get_object_pos(list);
        var left = pos.x;
        var top = pos.y + list.offsetHeight + 10;
      
        elm.style.top = top+'px';
        elm.style.left = left+'px';
        }
      
      elm.style.visibility = a ? 'visible' : 'hidden';
      }
      
    // clear upload form
    if (!a && this.gui_objects.attachmentform && this.gui_objects.attachmentform!=this.gui_objects.messageform)
      this.gui_objects.attachmentform.reset();
    };


  // upload attachment file
  this.upload_file = function(form)
    {
    if (!form)
      return false;
      
    // get file input fields
    var send = false;
    for (var n=0; n<form.elements.length; n++)
      if (form.elements[n].type=='file' && form.elements[n].value)
        {
        send = true;
        break;
        }
    
    // create hidden iframe and post upload form
    if (send)
      {
      var ts = new Date().getTime();
      var frame_name = 'rcmupload'+ts;

      // have to do it this way for IE
      // otherwise the form will be posted to a new window
      if(document.all && !window.opera)
        {
        var html = '<iframe name="'+frame_name+'" src="program/blank.gif" style="width:0;height:0;visibility:hidden;"></iframe>';
        document.body.insertAdjacentHTML('BeforeEnd',html);
        }
      else  // for standards-compilant browsers
        {
        var frame = document.createElement('IFRAME');
        frame.name = frame_name;
        frame.width = 10;
        frame.height = 10;
        frame.style.visibility = 'hidden';
        document.body.appendChild(frame);
        }

      form.target = frame_name;
      form.action = this.env.comm_path+'&_action=upload';
      form.setAttribute('enctype', 'multipart/form-data');
      form.submit();
      }
    
    // set reference to the form object
    this.gui_objects.attachmentform = form;
    };


  // add file name to attachment list
  // called from upload page
  this.add2attachment_list = function(name)
    {
    if (!this.gui_objects.attachmentlist)
      return false;
      
    var li = document.createElement('LI');
    li.innerHTML = name;
    this.gui_objects.attachmentlist.appendChild(li);
    };


  // send remote request to add a new contact
  this.add_contact = function(value)
    {
    if (value)
      this.http_request('addcontact', '_address='+value);
    };


  /*********************************************************/
  /*********     keyboard live-search methods      *********/
  /*********************************************************/


  // handler for keyboard events on address-fields
  this.ksearch_keypress = function(e, obj)
    {
    if (typeof(this.env.contacts)!='object' || !this.env.contacts.length)
      return true;

    if (this.ksearch_timer)
      clearTimeout(this.ksearch_timer);

    if (!e)
      e = window.event;
      
    var highlight;
    var key = e.keyCode ? e.keyCode : e.which;

    switch (key)
      {
      case 38:  // key up
      case 40:  // key down
        if (!this.ksearch_pane)
          break;
          
        var dir = key==38 ? 1 : 0;
        var next;
        
        highlight = document.getElementById('rcmksearchSelected');
        if (!highlight)
          highlight = this.ksearch_pane.ul.firstChild;
        
        if (highlight && (next = dir ? highlight.previousSibling : highlight.nextSibling))
          {
          highlight.removeAttribute('id');
          //highlight.removeAttribute('class');
          this.set_classname(highlight, 'selected', false);
          }

        if (next)
          {
          next.setAttribute('id', 'rcmksearchSelected');
          this.set_classname(next, 'selected', true);
          this.ksearch_selected = next._rcm_id;
          }

        if (e.preventDefault)
          e.preventDefault();
        return false;

      case 9:  // tab
        if(e.shiftKey)
          break;

      case 13:  // enter     
        if (this.ksearch_selected===null || !this.ksearch_input || !this.ksearch_value)
          break;

        // get cursor pos
        var inp_value = this.ksearch_input.value.toLowerCase();
        var cpos = this.get_caret_pos(this.ksearch_input);
        var p = inp_value.lastIndexOf(this.ksearch_value, cpos);
        
        // replace search string with full address
        var pre = this.ksearch_input.value.substring(0, p);
        var end = this.ksearch_input.value.substring(p+this.ksearch_value.length, this.ksearch_input.value.length);
        var insert = this.env.contacts[this.ksearch_selected]+', ';
        this.ksearch_input.value = pre + insert + end;
        
        //this.ksearch_input.value = this.ksearch_input.value.substring(0, p)+insert;
        
        // set caret to insert pos
        cpos = p+insert.length;
        if (this.ksearch_input.setSelectionRange)
          this.ksearch_input.setSelectionRange(cpos, cpos);
        
        // hide ksearch pane
        this.ksearch_hide();
      
        if (e.preventDefault)
          e.preventDefault();
        return false;

      case 27:  // escape
        this.ksearch_hide();
        break;

      }

    // start timer
    this.ksearch_timer = setTimeout(this.ref+'.ksearch_get_results()', 200);      
    this.ksearch_input = obj;
    
    return true;
    };


  // address search processor
  this.ksearch_get_results = function()
    {
    var inp_value = this.ksearch_input ? this.ksearch_input.value : null;
    if (inp_value===null)
      return;

    // get string from current cursor pos to last comma
    var cpos = this.get_caret_pos(this.ksearch_input);
    var p = inp_value.lastIndexOf(',', cpos-1);
    var q = inp_value.substring(p+1, cpos);

    // trim query string
    q = q.replace(/(^\s+|\s+$)/g, '').toLowerCase();

    if (!q.length || q==this.ksearch_value)
      {
      if (!q.length && this.ksearch_pane && this.ksearch_pane.visible)
        this.ksearch_pane.show(0);

      return;
      }

    this.ksearch_value = q;
    
    // start searching the contact list
    var a_results = new Array();
    var a_result_ids = new Array();
    var c=0;
    for (var i=0; i<this.env.contacts.length; i++)
      {
      if (this.env.contacts[i].toLowerCase().indexOf(q)>=0)
        {
        a_results[c] = this.env.contacts[i];
        a_result_ids[c++] = i;
        
        if (c==15)  // limit search results
          break;
        }
      }

    // display search results
    if (c && a_results.length)
      {
      var p, ul, li;
      
      // create results pane if not present
      if (!this.ksearch_pane)
        {
        ul = document.createElement('UL');
        this.ksearch_pane = new rcube_layer('rcmKSearchpane', {vis:0, zindex:30000});
        this.ksearch_pane.elm.appendChild(ul);
        this.ksearch_pane.ul = ul;
        }
      else
        ul = this.ksearch_pane.ul;

      // remove all search results
      ul.innerHTML = '';
            
      // add each result line to list
      for (i=0; i<a_results.length; i++)
        {
        li = document.createElement('LI');
        li.innerHTML = a_results[i].replace(/</, '&lt;').replace(/>/, '&gt;');
        li._rcm_id = a_result_ids[i];
        ul.appendChild(li);
        }

      // check if last selected item is still in result list
      if (this.ksearch_selected!==null)
        {
        p = find_in_array(this.ksearch_selected, a_result_ids);
        if (p>=0 && ul.childNodes)
          {
          ul.childNodes[p].setAttribute('id', 'rcmksearchSelected');
          this.set_classname(ul.childNodes[p], 'selected', true);
          }
        else
          this.ksearch_selected = null;
        }
      
      // if no item selected, select the first one
      if (this.ksearch_selected===null)
        {
        ul.firstChild.setAttribute('id', 'rcmksearchSelected');
        this.set_classname(ul.firstChild, 'selected', true);
        this.ksearch_selected = a_result_ids[0];
        }

      // resize the containing layer to fit the list
      //this.ksearch_pane.resize(ul.offsetWidth, ul.offsetHeight);
    
      // move the results pane right under the input box and make it visible
      var pos = rcube_get_object_pos(this.ksearch_input);
      this.ksearch_pane.move(pos.x, pos.y+this.ksearch_input.offsetHeight);
      this.ksearch_pane.show(1); 
      }
    // hide results pane
    else
      this.ksearch_hide();
    };


  this.ksearch_blur = function(e, obj)
    {
    if (this.ksearch_timer)
      clearTimeout(this.ksearch_timer);

    this.ksearch_value = '';      
    this.ksearch_input = null;
    
    this.ksearch_hide();
    };


  this.ksearch_hide = function()
    {
    this.ksearch_selected = null;
    
    if (this.ksearch_pane)
      this.ksearch_pane.show(0);    
    };



  /*********************************************************/
  /*********         address book methods          *********/
  /*********************************************************/


  this.list_contacts = function(page)
    {
    var add_url = '';
    var target = window;
    
    if (page && this.current_page==page)
      return false;

    // load contacts remotely
    if (this.gui_objects.contactslist)
      {
      this.list_contacts_remote(page);
      return;
      }

    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe])
      {
      target = window.frames[this.env.contentframe];
      add_url = '&_framed=1';
      }

    this.set_busy(true, 'loading');
    location.href = this.env.comm_path+(page ? '&_page='+page : '')+add_url;
    };


  // send remote request to load contacts list
  this.list_contacts_remote = function(page)
    {
    // clear list
    var table = this.gui_objects.contactslist;
    var tbody = document.createElement('TBODY');
    table.insertBefore(tbody, table.tBodies[0]);
    table.tBodies[1].style.display = 'none';
    
    this.contact_rows = new Array();
    this.list_rows = this.contact_rows;

    // send request to server
    var url = page ? '&_page='+page : '';
    this.set_busy(true, 'loading');
    this.http_request('list', url, true);
    };


  // load contact record
  this.load_contact = function(cid, action, framed)
    {
    var add_url = '';
    var target = window;
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe])
      {
      add_url = '&_framed=1';
      target = window.frames[this.env.contentframe];
      document.getElementById(this.env.contentframe).style.visibility = 'inherit';
      }
    else if (framed)
      return false;
      
    //if (this.env.framed && add_url=='')
    
    //  add_url = '&_framed=1';
    
    if (action && (cid || action=='add'))
      {
      this.set_busy(true);
      target.location.href = this.env.comm_path+'&_action='+action+'&_cid='+cid+add_url;
      }
    };


  this.delete_contacts = function()
    {
    // exit if no mailbox specified or if selection is empty
    if (!(this.selection.length || this.env.cid) || !confirm(this.get_label('deletecontactconfirm')))
      return;
      
    var a_cids = new Array();

    if (this.env.cid)
      a_cids[a_cids.length] = this.env.cid;
    else
      {
      var id;
      for (var n=0; n<this.selection.length; n++)
        {
        id = this.selection[n];
        a_cids[a_cids.length] = id;
      
        // 'remove' row from list (just hide it)
        if (this.contact_rows[id].obj)
          this.contact_rows[id].obj.style.display = 'none';
        }

      // hide content frame if we delete the currently displayed contact
      if (this.selection.length==1 && this.env.contentframe)
        {
        var elm = document.getElementById(this.env.contentframe);
        elm.style.visibility = 'hidden';
        }
      }

    // send request to server
    this.http_request('delete', '_cid='+a_cids.join(',')+'&_from='+(this.env.action ? this.env.action : ''));
    };


  // update a contact record in the list
  this.update_contact_row = function(cid, cols_arr)
    {
    if (!this.contact_rows[cid] || !this.contact_rows[cid].obj)
      return false;
      
    var row = this.contact_rows[cid].obj;
    for (var c=0; c<cols_arr.length; c++)
      if (row.cells[c])
        row.cells[c].innerHTML = cols_arr[c];

    };
  
  
  // load ldap search form
  this.ldappublicsearch = function(action)
    {
    var add_url = '';
    var target = window;
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe])
      {
      add_url = '&_framed=1';
      target = window.frames[this.env.contentframe];
      document.getElementById(this.env.contentframe).style.visibility = 'inherit';
      }
    else
      return false; 


    if (action == 'ldappublicsearch')
      target.location.href = this.env.comm_path+'&_action='+action+add_url;
    };
 
  // add ldap contacts to address book
  this.add_ldap_contacts = function()
    {
    if (window.frames[this.env.contentframe].rcmail)
      {
      var frame = window.frames[this.env.contentframe];

      // build the url
      var url    = '&_framed=1';
      var emails = '&_emails=';
      var names  = '&_names=';
      var end    = '';
      for (var n=0; n<frame.rcmail.selection.length; n++)
        {
        end = n < frame.rcmail.selection.length - 1 ? ',' : '';
        emails += frame.rcmail.ldap_contact_rows[frame.rcmail.selection[n]].obj.cells[1].innerHTML + end;
        names  += frame.rcmail.ldap_contact_rows[frame.rcmail.selection[n]].obj.cells[0].innerHTML + end;
        }
       
      frame.location.href = this.env.comm_path + '&_action=save&_framed=1' + emails + names;
      }
    return false;
    }
  


  /*********************************************************/
  /*********        user settings methods          *********/
  /*********************************************************/


  // load contact record
  this.load_identity = function(id, action)
    {
    if (action=='edit-identity' && (!id || id==this.env.iid))
      return;

    var add_url = '';
    var target = window;
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe])
      {
      add_url = '&_framed=1';
      target = window.frames[this.env.contentframe];
      document.getElementById(this.env.contentframe).style.visibility = 'inherit';
      }

    if (action && (id || action=='add-identity'))
      {
      this.set_busy(true);
      target.location.href = this.env.comm_path+'&_action='+action+'&_iid='+id+add_url;
      }
    };



  this.delete_identity = function(id)
    {
    // exit if no mailbox specified or if selection is empty
    if (!(this.selection.length || this.env.iid))
      return;
    
    if (!id)
      id = this.env.iid ? this.env.iid : this.selection[0];

/*
    // 'remove' row from list (just hide it)
    if (this.identity_rows && this.identity_rows[id].obj)
      {
      this.clear_selection();
      this.identity_rows[id].obj.style.display = 'none';
      }
*/

    // if (this.env.framed && id)
      this.set_busy(true);
      location.href = this.env.comm_path+'&_action=delete-identity&_iid='+id;
    // else if (id)
    //  this.http_request('delete-identity', '_iid='+id);
    };


  this.create_folder = function(name)
    {
    var form;
    if ((form = this.gui_objects.editform) && form.elements['_folder_name'])
      name = form.elements['_folder_name'].value;

    if (name)
      this.http_request('create-folder', '_name='+escape(name), true);
    else if (form.elements['_folder_name'])
      form.elements['_folder_name'].focus();
    };


  this.delete_folder = function(folder)
    {
    if (folder)
      {
      this.http_request('delete-folder', '_mboxes='+escape(folder));
      }
    };


  this.remove_folder_row = function(folder)
    {
    for (var id in this.env.subscriptionrows)
      if (this.env.subscriptionrows[id]==folder)
        break;

    var row;
    if (id && (row = document.getElementById(id)))
      row.style.display = 'none';    
    };


  this.subscribe_folder = function(folder)
    {
    var form;
    if ((form = this.gui_objects.editform) && form.elements['_unsubscribed'])
      this.change_subscription('_unsubscribed', '_subscribed', 'subscribe');
    else if (folder)
      this.http_request('subscribe', '_mboxes='+escape(folder));
    };


  this.unsubscribe_folder = function(folder)
    {
    var form;
    if ((form = this.gui_objects.editform) && form.elements['_subscribed'])
      this.change_subscription('_subscribed', '_unsubscribed', 'unsubscribe');
    else if (folder)
      this.http_request('unsubscribe', '_mboxes='+escape(folder));
    };
    

  this.change_subscription = function(from, to, action)
    {
    var form;
    if (form = this.gui_objects.editform)
      {
      var a_folders = new Array();
      var list_from = form.elements[from];

      for (var i=0; list_from && i<list_from.options.length; i++)
        {
        if (list_from.options[i] && list_from.options[i].selected)
          {
          a_folders[a_folders.length] = list_from.options[i].value;
          list_from[i] = null;
          i--;
          }
        }

      // yes, we have some folders selected
      if (a_folders.length)
        {
        var list_to = form.elements[to];
        var index;
        
        for (var n=0; n<a_folders.length; n++)
          {
          index = list_to.options.length;
          list_to[index] = new Option(a_folders[n]);
          }
          
        this.http_request(action, '_mboxes='+escape(a_folders.join(',')));
        }
      }
      
    };


   // add a new folder to the subscription list by cloning a folder row
   this.add_folder_row = function(name)
     {
     if (!this.gui_objects.subscriptionlist)
       return false;

     var tbody = this.gui_objects.subscriptionlist.tBodies[0];
     var id = tbody.childNodes.length+1;
     
     // clone a table row
     var row = this.clone_table_row(tbody.rows[0]);
     row.id = 'rcmrow'+id;
     tbody.appendChild(row);

     // add to folder/row-ID map
     this.env.subscriptionrows[row.id] = name;

     // set folder name
     row.cells[0].innerHTML = name;
     if (row.cells[1].firstChild.tagName=='INPUT')
       {
       row.cells[1].firstChild.value = name;
       row.cells[1].firstChild.checked = true;
       }
     if (row.cells[2].firstChild.tagName=='A')
       row.cells[2].firstChild.onclick = new Function(this.ref+".command('delete-folder','"+name+"')");

    var form;
    if ((form = this.gui_objects.editform) && form.elements['_folder_name'])
      form.elements['_folder_name'].value = '';
     };


  // duplicate a specific table row
  this.clone_table_row = function(row)
    {
    var cell, td;
    var new_row = document.createElement('TR');
    for(var n=0; n<row.childNodes.length; n++)
      {
      cell = row.childNodes[n];
      td = document.createElement('TD');

      if (cell.className)
        td.className = cell.className;
      if (cell.align)
        td.setAttribute('align', cell.align);
        
      td.innerHTML = cell.innerHTML;
      new_row.appendChild(td);
      }
    
    return new_row;
    };


  /*********************************************************/
  /*********           GUI functionality           *********/
  /*********************************************************/


  // eable/disable buttons for page shifting
  this.set_page_buttons = function()
    {
    this.enable_command('nextpage', (this.env.pagecount > this.env.current_page));
    this.enable_command('previouspage', (this.env.current_page > 1));
    }


  // set button to a specific state
  this.set_button = function(command, state)
    {
    var a_buttons = this.buttons[command];
    var button, obj;

    if(!a_buttons || !a_buttons.length)
      return;

    for(var n=0; n<a_buttons.length; n++)
      {
      button = a_buttons[n];
      obj = document.getElementById(button.id);

      // get default/passive setting of the button
      if (obj && button.type=='image' && !button.status)
        button.pas = obj._original_src ? obj._original_src : obj.src;
      else if (obj && !button.status)
        button.pas = String(obj.className);

      // set image according to button state
      if (obj && button.type=='image' && button[state])
        {
        button.status = state;        
        obj.src = button[state];
        }
      // set class name according to button state
      else if (obj && typeof(button[state])!='undefined')
        {
        button.status = state;        
        obj.className = button[state];        
        }
      // disable/enable input buttons
      if (obj && button.type=='input')
        {
        button.status = state;
        obj.disabled = !state;
        }
      }
    };


  // mouse over button
  this.button_over = function(command, id)
    {
    var a_buttons = this.buttons[command];
    var button, img;

    if(!a_buttons || !a_buttons.length)
      return;

    for(var n=0; n<a_buttons.length; n++)
      {
      button = a_buttons[n];
      if(button.id==id && button.status=='act')
        {
        img = document.getElementById(button.id);
        if (img && button.over)
          img.src = button.over;
        }
      }
    };


  // mouse out of button
  this.button_out = function(command, id)
    {
    var a_buttons = this.buttons[command];
    var button, img;

    if(!a_buttons || !a_buttons.length)
      return;

    for(var n=0; n<a_buttons.length; n++)
      {
      button = a_buttons[n];
      if(button.id==id && button.status=='act')
        {
        img = document.getElementById(button.id);
        if (img && button.act)
          img.src = button.act;
        }
      }
    };


  // set/unset a specific class name
  this.set_classname = function(obj, classname, set)
    {
    var reg = new RegExp('\s*'+classname, 'i');
    if (!set && obj.className.match(reg))
      obj.className = obj.className.replace(reg, '');
    else if (set && !obj.className.match(reg))
      obj.className += ' '+classname;
    };


  // display a specific alttext
  this.alttext = function(text)
    {
    
    };


  // display a system message
  this.display_message = function(msg, type, hold)
    {
    if (!this.loaded)  // save message in order to display after page loaded
      {
      this.pending_message = new Array(msg, type);
      return true;
      }
    
    if (!this.gui_objects.message)
      return false;
      
    if (this.message_timer)
      clearTimeout(this.message_timer);
    
    var cont = msg;
    if (type)
      cont = '<div class="'+type+'">'+cont+'</div>';

    this.gui_objects.message._rcube = this;
    this.gui_objects.message.innerHTML = cont;
    this.gui_objects.message.style.display = 'block';
    
    if (type!='loading')
      this.gui_objects.message.onmousedown = function(){ this._rcube.hide_message(); return true; };
    
    if (!hold)
      this.message_timer = setTimeout(this.ref+'.hide_message()', this.message_time);
    };


  // make a message row disapear
  this.hide_message = function()
    {
    if (this.gui_objects.message)
      {
      this.gui_objects.message.style.display = 'none';
      this.gui_objects.message.onmousedown = null;
      }
    };


  // mark a mailbox as selected and set environment variable
  this.select_mailbox = function(mbox)
    {
    if (this.gui_objects.mailboxlist)
      {
      var item, reg, text_obj;
      var s_current = this.env.mailbox.toLowerCase().replace(this.mbox_expression, '');
      var s_mbox = String(mbox).toLowerCase().replace(this.mbox_expression, '');
      var s_current = this.env.mailbox.toLowerCase().replace(this.mbox_expression, '');
      
      var current_li = document.getElementById('rcmbx'+s_current);
      var mbox_li = document.getElementById('rcmbx'+s_mbox);
      
      if (current_li)
        this.set_classname(current_li, 'selected', false);
      if (mbox_li)
        this.set_classname(mbox_li, 'selected', true);
      }
    
    this.env.mailbox = mbox;
    };


  // create a table row in the message list
  this.add_message_row = function(uid, cols, flags, attachment, attop)
    {
    if (!this.gui_objects.messagelist || !this.gui_objects.messagelist.tBodies[0])
      return false;
    
    var tbody = this.gui_objects.messagelist.tBodies[0];
    var rowcount = tbody.rows.length;
    var even = rowcount%2;
    
    this.env.messages[uid] = {replied:flags.replied?1:0,
                              unread:flags.unread?1:0};
    
    var row = document.createElement('TR');
    row.id = 'rcmrow'+uid;
    row.className = 'message '+(even ? 'even' : 'odd')+(flags.unread ? ' unread' : '')+(flags.deleted ? ' deleted' : '');
    
    if (this.in_selection(uid))
      row.className += ' selected';

    var icon = flags.unread && this.env.unreadicon ? this.env.unreadicon :
               (flags.replied && this.env.repliedicon ? this.env.repliedicon : this.env.messageicon);

    var col = document.createElement('TD');
    col.className = 'icon';
    col.innerHTML = icon ? '<img src="'+icon+'" alt="" border="0" />' : '';
    row.appendChild(col);

    // add each submitted col
    for (var c in cols)
      {
      col = document.createElement('TD');
      col.className = String(c).toLowerCase();
      col.innerHTML = cols[c];
      row.appendChild(col);
      }

    col = document.createElement('TD');
    col.className = 'icon';
    col.innerHTML = attachment && this.env.attachmenticon ? '<img src="'+this.env.attachmenticon+'" alt="" border="0" />' : '';
    row.appendChild(col);
    
    if (attop && tbody.rows.length)
      tbody.insertBefore(row, tbody.firstChild);
    else
      tbody.appendChild(row);
      
    this.init_message_row(row);
    };


  // replace content of row count display
  this.set_rowcount = function(text)
    {
    if (this.gui_objects.countdisplay)
      this.gui_objects.countdisplay.innerHTML = text;

    // update page navigation buttons
    this.set_page_buttons();
    };

  // replace content of quota display
   this.set_quota = function(text)
     {
     if (this.gui_objects.quotadisplay)
       this.gui_objects.quotadisplay.innerHTML = text;
     };
			     

  // update the mailboxlist
  this.set_unread_count = function(mbox, count, set_title)
    {
    if (!this.gui_objects.mailboxlist)
      return false;
      
    var item, reg, text_obj;
    mbox = String(mbox).toLowerCase().replace(this.mbox_expression, '');
    item = document.getElementById('rcmbx'+mbox);

    if (item && item.className && item.className.indexOf('mailbox '+mbox)>=0)
      {
      // set new text
      text_obj = item.firstChild;
      reg = /\s+\([0-9]+\)$/i;

      if (count && text_obj.innerHTML.match(reg))
        text_obj.innerHTML = text_obj.innerHTML.replace(reg, ' ('+count+')');
      else if (count)
        text_obj.innerHTML += ' ('+count+')';
      else
        text_obj.innerHTML = text_obj.innerHTML.replace(reg, '');
          
      // set the right classes
      this.set_classname(item, 'unread', count>0 ? true : false);
      }

    // set unread count to window title
    reg = /^\([0-9]+\)\s+/i;
    if (set_title && count && document.title)	
      {
      var doc_title = String(document.title);

      if (count && doc_title.match(reg))
        document.title = doc_title.replace(reg, '('+count+') ');
      else if (count)
        document.title = '('+count+') '+doc_title;
      else
        document.title = doc_title.replace(reg, '');
      }
    // remove unread count from window title
    else if (document.title)
      {
      document.title = document.title.replace(reg, '');
      }
    };


  // add row to contacts list
  this.add_contact_row = function(cid, cols)
    {
    if (!this.gui_objects.contactslist || !this.gui_objects.contactslist.tBodies[0])
      return false;
    
    var tbody = this.gui_objects.contactslist.tBodies[0];
    var rowcount = tbody.rows.length;
    var even = rowcount%2;
    
    var row = document.createElement('TR');
    row.id = 'rcmrow'+cid;
    row.className = 'contact '+(even ? 'even' : 'odd');
    
    if (this.in_selection(cid))
      row.className += ' selected';

    // add each submitted col
    for (var c in cols)
      {
      col = document.createElement('TD');
      col.className = String(c).toLowerCase();
      col.innerHTML = cols[c];
      row.appendChild(col);
      }
    
    tbody.appendChild(row);
    this.init_table_row(row, 'contact_rows');
    };



  /********************************************************/
  /*********          drag & drop methods         *********/
  /********************************************************/


  this.drag_mouse_move = function(e)
    {
    if (this.drag_start)
      {
      if (!this.draglayer)
        this.draglayer = new rcube_layer('rcmdraglayer', {x:0, y:0, width:300, vis:0, zindex:2000});
      
      // get subjects of selectedd messages
      var names = '';
      var c, subject, obj;
      for(var n=0; n<this.selection.length; n++)
        {
        if (n>12)  // only show 12 lines
          {
          names += '...';
          break;
          }

        if (this.message_rows[this.selection[n]].obj)
          {
          obj = this.message_rows[this.selection[n]].obj;
          subject = '';

          for(c=0; c<obj.childNodes.length; c++)
            if (!subject && obj.childNodes[c].nodeName=='TD' && obj.childNodes[c].firstChild && obj.childNodes[c].firstChild.nodeType==3)
              {
              subject = obj.childNodes[c].firstChild.data;
              names += (subject.length > 50 ? subject.substring(0, 50)+'...' : subject) + '<br />';
              }
          }
        }
        
      this.draglayer.write(names);
      this.draglayer.show(1);
      }

    var pos = this.get_mouse_pos(e);
    this.draglayer.move(pos.x+20, pos.y-5);
    
    this.drag_start = false;
    this.drag_active = true;
    
    return false;
    };


  this.drag_mouse_up = function()
    {
    document.onmousemove = null;
    
    if (this.draglayer && this.draglayer.visible)
      this.draglayer.show(0);
      
    this.drag_active = false;
    
    return false;
    };



  /********************************************************/
  /*********        remote request methods        *********/
  /********************************************************/


  this.http_sockets = new Array();
  
  // find a non-busy socket or create a new one
  this.get_request_obj = function()
    {
    for (var n=0; n<this.http_sockets.length; n++)
      {
      if (!this.http_sockets[n].busy)
        return this.http_sockets[n];
      }
    
    // create a new XMLHTTP object
    var i = this.http_sockets.length;
    this.http_sockets[i] = new rcube_http_request();

    return this.http_sockets[i];
    };
  

  // send a http request to the server
  this.http_request = function(action, querystring, lock)
    {
    var request_obj = this.get_request_obj();
    querystring += '&_remote=1';
    
    // add timestamp to request url to avoid cacheing problems in Safari
    if (bw.safari)
      querystring += '&_ts='+(new Date().getTime());

    // send request
    if (request_obj)
      {
      // prompt('request', this.env.comm_path+'&_action='+escape(action)+'&'+querystring);
      console('HTTP request: '+this.env.comm_path+'&_action='+escape(action)+'&'+querystring);

      if (lock)
        this.set_busy(true);

      request_obj.__lock = lock ? true : false;
      request_obj.__action = action;
      request_obj.onerror = function(o){ rcube_webmail_client.http_error(o); };
      request_obj.oncomplete = function(o){ rcube_webmail_client.http_response(o); };
      request_obj.GET(this.env.comm_path+'&_action='+escape(action)+'&'+querystring);
      }
    };


  // handle HTTP response
  this.http_response = function(request_obj)
    {
    var ctype = request_obj.get_header('Content-Type');
    if (ctype)
      ctype = String(ctype).toLowerCase();

    if (request_obj.__lock)
      this.set_busy(false);

  console(request_obj.get_text());

    // if we get javascript code from server -> execute it
    if (request_obj.get_text() && (ctype=='text/javascript' || ctype=='application/x-javascript'))
      eval(request_obj.get_text());

    // process the response data according to the sent action
    switch (request_obj.__action)
      {
      case 'delete':
      case 'moveto':
        if (this.env.action=='show')
          this.command('list');
        break;

      case 'list':
        if (this.env.messagecount)
          this.enable_command('purge', (this.env.mailbox==this.env.trash_mailbox));

      case 'expunge':
        this.enable_command('select-all', 'select-none', 'expunge', this.env.messagecount ? true : false);
        break;      
      }

    request_obj.reset();
    };


  // handle HTTP request errors
  this.http_error = function(request_obj)
    {
    alert('Error sending request: '+request_obj.url);

    if (request_obj.__lock)
      this.set_busy(false);

    request_obj.reset();
    request_obj.__lock = false;
    };


  // use an image to send a keep-alive siganl to the server
  this.send_keep_alive = function()
    {
    var d = new Date();
    this.http_request('keep-alive', '_t='+d.getTime());
    };

    
  // send periodic request to check for recent messages
  this.check_for_recent = function()
    {
    var d = new Date();
    this.http_request('check-recent', '_t='+d.getTime());
    };


  /********************************************************/
  /*********            helper methods            *********/
  /********************************************************/
  
  // check if we're in show mode or if we have a unique selection
  // and return the message uid
  this.get_single_uid = function()
    {
    return this.env.uid ? this.env.uid : (this.selection.length==1 ? this.selection[0] : null);
    };

  // same as above but for contacts
  this.get_single_cid = function()
    {
    return this.env.cid ? this.env.cid : (this.selection.length==1 ? this.selection[0] : null);
    };


  // check if Shift-key is pressed on event
  this.check_shiftkey = function(e)
    {
    if(!e && window.event)
      e = window.event;

    if(bw.linux && bw.ns4 && e.modifiers)
      return true;
    else if((bw.ns4 && e.modifiers & Event.SHIFT_MASK) || (e && e.shiftKey))
      return true;
    else
      return false;
    }

  // check if Shift-key is pressed on event
  this.check_ctrlkey = function(e)
    {
    if(!e && window.event)
      e = window.event;

    if(bw.linux && bw.ns4 && e.modifiers)
      return true;
   else if (bw.mac)
       return this.check_shiftkey(e);
    else if((bw.ns4 && e.modifiers & Event.CTRL_MASK) || (e && e.ctrlKey))
      return true;
    else
      return false;
    }


// returns modifier key (constants defined at top of file)
  this.get_modifier = function(e)
    {
    var opcode = 0;
    if (e = e || window.event)
    {
      opcode += (e.ctrlKey && CONTROL_KEY) + (e.shiftKey && SHIFT_KEY);
	  return opcode;
    }
    if (e.cancelBubble)
    {
      e.cancelBubble = true;
      e.returnValue = false;
    }
    else if (e.preventDefault)
      e.preventDefault();
  }


  this.get_mouse_pos = function(e)
    {
    if(!e) e = window.event;
    var mX = (e.pageX) ? e.pageX : e.clientX;
    var mY = (e.pageY) ? e.pageY : e.clientY;

    if(document.body && document.all)
      {
      mX += document.body.scrollLeft;
      mY += document.body.scrollTop;
      }

    return { x:mX, y:mY };
    };
    
  
  this.get_caret_pos = function(obj)
    {
    if (typeof(obj.selectionEnd)!='undefined')
      return obj.selectionEnd;

    else if (document.selection && document.selection.createRange)
      {
      var range = document.selection.createRange();
      if (range.parentElement()!=obj)
        return 0;

      var gm = range.duplicate();
      if (obj.tagName=='TEXTAREA')
        gm.moveToElementText(obj);
      else
        gm.expand('textedit');
      
      gm.setEndPoint('EndToStart', range);
      var p = gm.text.length;

      return p<=obj.value.length ? p : -1;
      }

    else
      return obj.value.length;
    };


  this.set_caret2start = function(obj)
    {
    if (obj.createTextRange)
      {
      var range = obj.createTextRange();
      range.collapse(true);
      range.select();
      }
    else if (obj.setSelectionRange)
      obj.setSelectionRange(0,0);

    obj.focus();
    };


  // set all fields of a form disabled
  this.lock_form = function(form, lock)
    {
    if (!form || !form.elements)
      return;
    
    var type;
    for (var n=0; n<form.elements.length; n++)
      {
      type = form.elements[n];
      if (type=='hidden')
        continue;
        
      form.elements[n].disabled = lock;
      }
    };
    
  }  // end object rcube_webmail



// class for HTTP requests
function rcube_http_request()
  {
  this.url = '';
  this.busy = false;
  this.xmlhttp = null;


  // reset object properties
  this.reset = function()
    {
    // set unassigned event handlers
    this.onloading = function(){ };
    this.onloaded = function(){ };
    this.oninteractive = function(){ };
    this.oncomplete = function(){ };
    this.onabort = function(){ };
    this.onerror = function(){ };
    
    this.url = '';
    this.busy = false;
    this.xmlhttp = null;
    }


  // create HTMLHTTP object
  this.build = function()
    {
    if (window.XMLHttpRequest)
      this.xmlhttp = new XMLHttpRequest();
    else if (window.ActiveXObject)
      this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    else
      {
      
      }
    }

  // sedn GET request
  this.GET = function(url)
    {
    this.build();

    if (!this.xmlhttp)
      {
      this.onerror(this);
      return false;
      }

    var ref = this;
    this.url = url;
    this.busy = true;

    this.xmlhttp.onreadystatechange = function(){ ref.xmlhttp_onreadystatechange(); };
    this.xmlhttp.open('GET', url);
    this.xmlhttp.send(null);
    };


  this.POST = function(url, a_param)
    {
    // not implemented yet
    };


  // handle onreadystatechange event
  this.xmlhttp_onreadystatechange = function()
    {
    if(this.xmlhttp.readyState == 1)
      this.onloading(this);

    else if(this.xmlhttp.readyState == 2)
      this.onloaded(this);

    else if(this.xmlhttp.readyState == 3)
      this.oninteractive(this);

    else if(this.xmlhttp.readyState == 4)
      {
      if(this.xmlhttp.status == 0)
        this.onabort(this);
      else if(this.xmlhttp.status == 200)
        this.oncomplete(this);
      else
        this.onerror(this);
        
      this.busy = false;
      }
    }

  // getter method for HTTP headers
  this.get_header = function(name)
    {
    return this.xmlhttp.getResponseHeader(name);
    };

  this.get_text = function()
    {
    return this.xmlhttp.responseText;
    };

  this.get_xml = function()
    {
    return this.xmlhttp.responseXML;
    };

  this.reset();
  
  }  // end class rcube_http_request



function console(str)
  {
  if (document.debugform && document.debugform.console)
    document.debugform.console.value += str+'\n--------------------------------------\n';
  }


// set onload handler
window.onload = function(e)
  {
  if (window.rcube_webmail_client)
    rcube_webmail_client.init();
  };