function ControlBar(document, serverUrl, database) {
  this._document = document;
  this.serverUrl = serverUrl;
  this.database = database;
  this._window = window;
  this.callbacks = [];
};

ControlBar.HTML =
  '<div>' +
    '<div class="ui-widget-overlay"></div>' +
    '<div id="ng-login" ng:non-bindable="true">' +
      '<div class="ng-login-container"></div>' +
    '</div>' +
  '</div>';


ControlBar.FORBIDEN =
  '<div ng:non-bindable="true" title="Permission Error:">' +
    'Sorry, you do not have permission for this!'+
  '</div>';

ControlBar.prototype = {
  bind: function () {
  },
  
  login: function (loginSubmitFn) {
    this.callbacks.push(loginSubmitFn);
    if (this.callbacks.length == 1) {
      this.doTemplate("/user_session/new.mini?database="+encodeURIComponent(this.database)+"&return_url=" + encodeURIComponent(this.urlWithoutAnchor()));
    }
  },
  
  logout: function (loginSubmitFn) {
    this.callbacks.push(loginSubmitFn);
    if (this.callbacks.length == 1) {
      this.doTemplate("/user_session/do_destroy.mini");
    }
  },
  
  urlWithoutAnchor: function (path) {
    return this._window['location']['href'].split("#")[0];
  },
  
  doTemplate: function (path) {
    var self = this;
    var id = new Date().getTime();
    var url = this.urlWithoutAnchor() + "#$iframe_notify=" + id;
    var iframeHeight = 330;
    var loginView = jQuery('<div style="overflow:hidden; padding:2px 0 0 0;"><iframe name="'+ url +'" src="'+this.serverUrl + path + '" width="500" height="'+ iframeHeight +'"/></div>');
    this._document.append(loginView);
    loginView['dialog']({
      'height':iframeHeight + 33, 'width':500,
      'resizable': false, 'modal':true,
      'title': 'Authentication: <a href="http://www.getangular.com"><tt>&lt;angular/&gt;</tt></a>'
    });
    angularCallbacks["_iframe_notify_" + id] = function() {
      loginView['dialog']("destroy");
      loginView['remove']();
      foreach(self.callbacks, function(callback){
        callback();
      });
      self.callbacks = [];
    };
  },
  
  notAuthorized: function () {
    if (this.forbidenView) return;
    this.forbidenView = jQuery(ControlBar.FORBIDEN);
    this.forbidenView.dialog({bgiframe:true, height:70, modal:true});
  }
};