import Location
closingListeners = []
resizeListeners = []

def addWindowCloseListener(listener):
    global closingListeners
    closingListeners.append(listener)

def addWindowResizeListener(listener):
    global resizeListeners
    resizeListeners.append(listener)

def alert(msg):
    JS("""
    $wnd.alert(msg);
    """)

def confirm(msg):
    JS("""
    return $wnd.confirm(msg);
    """)

def enableScrolling(enable):
    JS("""
    $doc.body.style.overflow = enable ? 'auto' : 'hidden';
    """)

def getClientHeight():
    JS("""
    if ($wnd.innerHeight)
        return $wnd.innerHeight;
    return $doc.body.clientHeight;
    """)

def getClientWidth():
    JS("""
    if ($wnd.innerWidth)
        return $wnd.innerWidth;
    return $doc.body.clientWidth;
    """)

JS("var Window_location = null")
def getLocation():
    global location
    JS("""
    if(!Window_location)
       Window_location = Location_Location($wnd.location);
    return Window_location;
    """)
 
 
def getTitle():
    JS("""
    return $doc.title;
    """)

def open(url, name, features):
    JS("""
    $wnd.open(url, name, features);
    """)

def removeWindowCloseListener(listener):
    global closingListeners
    closingListeners.remove(listener)

def removeWindowResizeListener(listener):
    global resizeListeners
    resizeListeners.remove(listener)

def setMargin(size):
    JS("""
    $doc.body.style.margin = size;
    """)

def setTitle(title):
    JS("""
    $doc.title = title;
    """)

# TODO: call fireClosedAndCatch
def onClosed():
    fireClosedImpl()

# TODO: call fireClosingAndCatch
def onClosing():
    fireClosingImpl()

# TODO: call fireResizedAndCatch
def onResize():
    fireResizedImpl()

def fireClosedAndCatch(handler):
    # FIXME - need implementation
    pass

def fireClosedImpl():
    global closingListeners
    
    for listener in closingListeners:
        listener.onWindowClosed()

def fireClosingAndCatch(handler):
    # FIXME - need implementation
    pass

def fireClosingImpl():
    global closingListeners
    
    ret = None
    for listener in closingListeners:
        msg = listener.onWindowClosing()
        if ret == None:
            ret = msg
    return ret

def fireResizedAndCatch(handler):
    # FIXME - need implementation
    pass

def fireResizedImpl():
    global resizeListeners

    for listener in resizeListeners:
        listener.onWindowResized(getClientWidth(), getClientHeight())

def init():
    JS("""
    $wnd.__pygwt_initHandlers(
        function() {
            Window_onResize();
        },
        function() {
            return Window_onClosing();
        },
        function() {
            Window_onClosed();
            $wnd.onresize = null;
            $wnd.onbeforeclose = null;
            $wnd.onclose = null;
        }
    );
    """)

init()