class ChromeWindows extends ChromeApi {
 static final JsObject _windows = chrome['windows'];

 ChromeWindows._();

 bool get available => _windows != null;

 /**
  * The windowId value that represents the absence of a chrome browser window.
  */
 int get WINDOW_ID_NONE => _windows['WINDOW_ID_NONE'];

 /**
  * The windowId value that represents the [current
  * window](windows.html#current-window).
  */
 int get WINDOW_ID_CURRENT => _windows['WINDOW_ID_CURRENT'];

 /**
  * Gets details about a window.
  * 
  * [getInfo]
  */
 Future<Window> get(int windowId, [WindowsGetParams getInfo]) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter<Window>.oneArg(_createWindow);
   _windows.callMethod('get', [windowId, jsify(getInfo), completer.callback]);
   return completer.future;
 }

 /**
  * Gets the [current window](#current-window).
  * 
  * [getInfo]
  */
 Future<Window> getCurrent([WindowsGetCurrentParams getInfo]) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter<Window>.oneArg(_createWindow);
   _windows.callMethod('getCurrent', [jsify(getInfo), completer.callback]);
   return completer.future;
 }

 /**
  * Gets the window that was most recently focused - typically the window 'on
  * top'.
  * 
  * [getInfo]
  */
 Future<Window> getLastFocused([WindowsGetLastFocusedParams getInfo]) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter<Window>.oneArg(_createWindow);
   _windows.callMethod('getLastFocused', [jsify(getInfo), completer.callback]);
   return completer.future;
 }

 /**
  * Gets all windows.
  * 
  * [getInfo]
  */
 Future<List<Window>> getAll([WindowsGetAllParams getInfo]) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter<List<Window>>.oneArg((e) => listify(e, _createWindow));
   _windows.callMethod('getAll', [jsify(getInfo), completer.callback]);
   return completer.future;
 }

 /**
  * Creates (opens) a new browser with any optional sizing, position or default
  * URL provided.
  * 
  * Returns:
  * Contains details about the created window.
  */
 Future<Window> create([WindowsCreateParams createData]) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter<Window>.oneArg(_createWindow);
   _windows.callMethod('create', [jsify(createData), completer.callback]);
   return completer.future;
 }

 /**
  * Updates the properties of a window. Specify only the properties that you
  * want to change; unspecified properties will be left unchanged.
  */
 Future<Window> update(int windowId, WindowsUpdateParams updateInfo) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter<Window>.oneArg(_createWindow);
   _windows.callMethod('update', [windowId, jsify(updateInfo), completer.callback]);
   return completer.future;
 }

 /**
  * Removes (closes) a window, and all the tabs inside it.
  */
 Future remove(int windowId) {
   if (_windows == null) _throwNotAvailable();

   var completer = new ChromeCompleter.noArgs();
   _windows.callMethod('remove', [windowId, completer.callback]);
   return completer.future;
 }

 /**
  * Fired when a window is created.
  */
 Stream<Window> get onCreated => _onCreated.stream;

 final ChromeStreamController<Window> _onCreated =
     new ChromeStreamController<Window>.oneArg(_windows, 'onCreated', _createWindow);

 /**
  * Fired when a window is removed (closed).
  */
 Stream<int> get onRemoved => _onRemoved.stream;

 final ChromeStreamController<int> _onRemoved =
     new ChromeStreamController<int>.oneArg(_windows, 'onRemoved', selfConverter);

 /**
  * Fired when the currently focused window changes. Will be
  * chrome.windows.WINDOW_ID_NONE if all chrome windows have lost focus. Note:
  * On some Linux window managers, WINDOW_ID_NONE will always be sent
  * immediately preceding a switch from one chrome window to another.
  */
 Stream<int> get onFocusChanged => _onFocusChanged.stream;

 final ChromeStreamController<int> _onFocusChanged =
     new ChromeStreamController<int>.oneArg(_windows, 'onFocusChanged', selfConverter);

 void _throwNotAvailable() {
   throw new UnsupportedError("'chrome.windows' is not available");
 }
}