var gAS_Controller = {
  Cc: Components.classes,
  Ci: Components.interfaces,
  _preferences: null,

  load: function()
  {
    var prefService = this.Cc["@mozilla.org/preferences-service;1"]
                             .getService(this.Ci.nsIPrefService);
    this._preferences = prefService.getBranch("extensions.audioscrobbler.");
    this._preferences.QueryInterface(this.Ci.nsIPrefBranch2)
                     .addObserver("", this, false);

    this._as = this.Cc["@skrul.com/audioscrobbler-service;1"]
                      .getService(this.Ci.sbIAudioscrobblerService);
    this._as.addObserver(this);

    this._view = this.Cc["@skrul.com/songbird-xml-tree-view;1"]
                        .createInstance(this.Ci.sbIXMLTreeView);
    var tree = document.getElementById("recenttracksTree");
    tree.view = this._view;

    this._updateFeedTree();
    this._updateUI();
  },

  unload: function()
  {
    this._preferences.QueryInterface(this.Ci.nsIPrefBranch2)
                     .removeObserver("", this);
    this._as.removeObserver(this);
  },

  observe: function(aSubject, aTopic, aData)
  {
    if(aTopic == "nsPref:changed") {
      this._updateUI();
    }

    if(aTopic == "userfeed-updated") {
      this._updateFeedTree();
    }
  },

  openPreferences: function()
  {
    var features = "chrome,titlebar,toolbar,centerscreen,modal";
    window.openDialog("chrome://audioscrobbler/content/preferences.xul",
                      "Preferences",
                      features);
  },

  _updateUI: function()
  {
    var username = document.getElementById("audioscrobblerUsername");
    var status   = document.getElementById("audioscrobblerStatus");
    username.value = this._preferences.getCharPref("username");

    var s;
    switch(this._preferences.getIntPref("status")) {
      case this.Ci.sbIAudioscrobblerService.STATUS_NOCREDENTIALS:
        s = "Click 'Preferences' to set up";
      break;
      case this.Ci.sbIAudioscrobblerService.STATUS_READY:
        s = "Ready";
      break;
      case this.Ci.sbIAudioscrobblerService.STATUS_BADPASS:
        s = "Bad authorization, please check your password";
      break;
    }
    status.value = s;
  },

  _updateFeedTree: function()
  {
    var doc = this._as.getUserFeedData("recenttracks");
    if(doc) {
      this._view.document = doc;
    }
  }
}