// create creates the window, initializes the keybind and mousebind packages
// and sets up the window to act like a real top-level client.
func (w *window) create() {
	keybind.Initialize(w.X)
	mousebind.Initialize(w.X)

	err := w.CreateChecked(w.X.RootWin(), 0, 0, flagWidth, flagHeight,
		xproto.CwBackPixel, 0xffffff)
	if err != nil {
		errLg.Fatalf("Could not create window: %s", err)
	}

	// Make the window close gracefully using the WM_DELETE_WINDOW protocol.
	w.WMGracefulClose(func(w *xwindow.Window) {
		xevent.Detach(w.X, w.Id)
		keybind.Detach(w.X, w.Id)
		mousebind.Detach(w.X, w.Id)
		w.Destroy()
		xevent.Quit(w.X)
	})

	// Set WM_STATE so it is interpreted as top-level and is mapped.
	err = icccm.WmStateSet(w.X, w.Id, &icccm.WmState{
		State: icccm.StateNormal,
	})
	if err != nil { // not a fatal error
		lg("Could not set WM_STATE: %s", err)
	}

	// _NET_WM_STATE = _NET_WM_STATE_NORMAL
	ewmh.WmStateSet(w.X, w.Id, []string{"_NET_WM_STATE_NORMAL"})

	// Set the name to something.
	w.nameSet("Decoding all images...")

	w.Map()
}

func (app *RuntimeApp) Activate(x, y int32) error {
	//TODO: handle multiple xids
	switch {
	case !contains(app.state, "_NET_WM_STATE_FOCUSED"):
		activateWindow(app.CurrentInfo.Xid)
	case contains(app.state, "_NET_WM_STATE_FOCUSED"):
		s, err := icccm.WmStateGet(XU, app.CurrentInfo.Xid)
		if err != nil {
			logger.Info("WmStateGetError:", s, err)
			return err
		}
		switch s.State {
		case icccm.StateIconic:
			s.State = icccm.StateNormal
			icccm.WmStateSet(XU, app.CurrentInfo.Xid, s)
		case icccm.StateNormal:
			activeXid, _ := ewmh.ActiveWindowGet(XU)
			logger.Debugf("%s, 0x%x(c), 0x%x(a), %v", app.Id,
				app.CurrentInfo.Xid, activeXid, app.state)
			if len(app.xids) == 1 {
				s.State = icccm.StateIconic
				iconifyWindow(app.CurrentInfo.Xid)
			} else {
				logger.Warningf("activeXid is 0x%x, current is 0x%x", activeXid,
					app.CurrentInfo.Xid)
				if activeXid == app.CurrentInfo.Xid {
					x := app.findNextLeader()
					ewmh.ActiveWindowReq(XU, x)
				}
			}
		}
	}
	return nil
}

func (c *Client) unmanage() {
	wm.X.Grab()
	defer wm.X.Ungrab()

	go func() {
		c.frames.destroy()
		c.prompts.destroy()
	}()

	logger.Message.Printf("Unmanaging client: %s", c)

	c.frame.Unmap()
	c.win.Detach()
	icccm.WmStateSet(wm.X, c.Id(), &icccm.WmState{State: icccm.StateWithdrawn})
	focus.Remove(c)
	wm.FocusFallback()
	stack.Remove(c)
	c.workspace.Remove(c)
	wm.RemoveClient(c)
	c.attnStop()
	xproto.ChangeSaveSetChecked(
		wm.X.Conn(), xproto.SetModeDelete, c.Id()).Check()

	if c.hadStruts {
		wm.Heads.ApplyStruts(wm.Clients)
	}
}

func (c *Client) Map() {
	if c.IsMapped() {
		return
	}
	c.win.Map()
	c.frame.Map()
	icccm.WmStateSet(wm.X, c.Id(), &icccm.WmState{State: icccm.StateNormal})
}

func (c *Client) Unmap() {
	if !c.IsMapped() {
		return
	}
	c.unmapIgnore++
	c.frame.Unmap()
	c.win.Unmap()
	icccm.WmStateSet(wm.X, c.Id(), &icccm.WmState{State: icccm.StateIconic})
}

func main() {
	X, _ := xgbutil.NewConn()

	active, err := ewmh.ActiveWindowGet(X)

	wmName, err := icccm.WmNameGet(X, active)
	showTest("WM_NAME get", wmName, err)

	err = icccm.WmNameSet(X, active, "hooblah")
	wmName, _ = icccm.WmNameGet(X, active)
	showTest("WM_NAME set", wmName, err)

	wmNormHints, err := icccm.WmNormalHintsGet(X, active)
	showTest("WM_NORMAL_HINTS get", wmNormHints, err)

	wmNormHints.Width += 5
	err = icccm.WmNormalHintsSet(X, active, wmNormHints)
	showTest("WM_NORMAL_HINTS set", wmNormHints, err)

	wmHints, err := icccm.WmHintsGet(X, active)
	showTest("WM_HINTS get", wmHints, err)

	wmHints.InitialState = icccm.StateNormal
	err = icccm.WmHintsSet(X, active, wmHints)
	showTest("WM_NORMAL_HINTS set", wmHints, err)

	wmClass, err := icccm.WmClassGet(X, active)
	showTest("WM_CLASS get", wmClass, err)

	wmClass.Instance = "hoopdy hoop"
	err = icccm.WmClassSet(X, active, wmClass)
	showTest("WM_CLASS set", wmClass, err)

	wmTrans, err := icccm.WmTransientForGet(X, active)
	showTest("WM_TRANSIENT_FOR get", wmTrans, err)

	wmProts, err := icccm.WmProtocolsGet(X, active)
	showTest("WM_PROTOCOLS get", wmProts, err)

	wmClient, err := icccm.WmClientMachineGet(X, active)
	showTest("WM_CLIENT_MACHINE get", wmClient, err)

	err = icccm.WmClientMachineSet(X, active, "Leopard")
	wmClient, _ = icccm.WmClientMachineGet(X, active)
	showTest("WM_CLIENT_MACHINE set", wmClient, err)

	wmState, err := icccm.WmStateGet(X, active)
	showTest("WM_STATE get", wmState, err)

	wmState.Icon = xproto.Window(8365538)
	wmState.State = icccm.StateNormal
	err = icccm.WmStateSet(X, active, wmState)
	wmState, _ = icccm.WmStateGet(X, active)
	showTest("WM_STATE set", wmState, err)
}

// This is a slightly modified version of xgraphics.XShowExtra that does
// not set any resize constraints on the window (so that it can go
// fullscreen).
func showImage(im *xgraphics.Image, name string, quit bool) *xwindow.Window {
	if len(name) == 0 {
		name = "xgbutil Image Window"
	}
	w, h := im.Rect.Dx(), im.Rect.Dy()

	win, err := xwindow.Generate(im.X)
	if err != nil {
		xgbutil.Logger.Printf("Could not generate new window id: %s", err)
		return nil
	}

	// Create a very simple window with dimensions equal to the image.
	win.Create(im.X.RootWin(), 0, 0, w, h, 0)

	// Make this window close gracefully.
	win.WMGracefulClose(func(w *xwindow.Window) {
		xevent.Detach(w.X, w.Id)
		keybind.Detach(w.X, w.Id)
		mousebind.Detach(w.X, w.Id)
		w.Destroy()

		if quit {
			xevent.Quit(w.X)
		}
	})

	// Set WM_STATE so it is interpreted as a top-level window.
	err = icccm.WmStateSet(im.X, win.Id, &icccm.WmState{
		State: icccm.StateNormal,
	})
	if err != nil { // not a fatal error
		xgbutil.Logger.Printf("Could not set WM_STATE: %s", err)
	}

	// Set _NET_WM_NAME so it looks nice.
	err = ewmh.WmNameSet(im.X, win.Id, name)
	if err != nil { // not a fatal error
		xgbutil.Logger.Printf("Could not set _NET_WM_NAME: %s", err)
	}

	// Paint our image before mapping.
	im.XSurfaceSet(win.Id)
	im.XDraw()
	im.XPaint(win.Id)

	// Now we can map, since we've set all our properties.
	// (The initial map is when the window manager starts managing.)
	win.Map()

	return win
}

func (c *client) unmanage() {
	X.Grab()
	defer X.Ungrab()

	c.win.Detach()
	icccm.WmStateSet(c.X, c.Id(), &icccm.WmState{State: icccm.StateWithdrawn})
	c.Unmap()
	c.workspace.Remove(c)
	c.frames.destroy()
	c.prompts.destroy()

	focus.Remove(c)
	stack.Remove(c)
	wingo.remove(c)
	wingo.focusFallback()
}

// newWindow creates the window, initializes the keybind and mousebind packages
// and sets up the window to act like a real top-level client.
func newWindow(X *xgbutil.XUtil) *Window {
	w, err := xwindow.Generate(X)
	if err != nil {
		errLg.Fatalf("Could not create window: %s", err)
	}

	keybind.Initialize(w.X)
	mousebind.Initialize(w.X)

	err = w.CreateChecked(w.X.RootWin(), 0, 0, 600, 600, xproto.CwBackPixel, 0xffffff)
	if err != nil {
		errLg.Fatalf("Could not create window: %s", err)
	}

	// Make the window close gracefully using the WM_DELETE_WINDOW protocol.
	w.WMGracefulClose(func(w *xwindow.Window) {
		xevent.Detach(w.X, w.Id)
		keybind.Detach(w.X, w.Id)
		mousebind.Detach(w.X, w.Id)
		w.Destroy()
		xevent.Quit(w.X)
	})

	// Set WM_STATE so it is interpreted as top-level and is mapped.
	err = icccm.WmStateSet(w.X, w.Id, &icccm.WmState{State: icccm.StateNormal})
	if err != nil {
		lg("Could not set WM_STATE: %s", err)
	}

	// _NET_WM_STATE = _NET_WM_STATE_NORMAL
	// not needed because we we set FS later anyway?
	//ewmh.WmStateSet(w.X, w.Id, []string{"_NET_WM_STATE_NORMAL"})

	w.Map()

	err = ewmh.WmStateReq(w.X, w.Id, ewmh.StateToggle, "_NET_WM_STATE_FULLSCREEN")
	if err != nil {
		lg("Failed to go FullScreen:", err)
	}
	return &Window{w}
}

func (c *Client) unmanage() {
	wm.X.Grab()
	defer wm.X.Ungrab()

	go func() {
		c.frames.destroy()
		c.prompts.destroy()
	}()

	logger.Message.Printf("Unmanaging client: %s", c)

	infoWorkspace := c.workspace.String()
	infoClass := c.Class().Class
	infoInstance := c.Class().Instance
	infoName := c.Name()

	c.frame.Unmap()
	c.win.Detach()
	icccm.WmStateSet(wm.X, c.Id(), &icccm.WmState{State: icccm.StateWithdrawn})
	focus.Remove(c)
	wm.FocusFallback()
	stack.Remove(c)
	c.workspace.Remove(c)
	wm.RemoveClient(c)
	c.attnStop()
	xproto.ChangeSaveSetChecked(
		wm.X.Conn(), xproto.SetModeDelete, c.Id()).Check()

	if c.hadStruts {
		wm.Heads.ApplyStruts(wm.Clients)
	}

	event.Notify(event.UnmanagedClient{
		Id:        c.Id(),
		Name:      infoName,
		Workspace: infoWorkspace,
		Class:     infoClass,
		Instance:  infoInstance,
	})
}

func NewWindow() *Window {
	win, err := xwindow.Generate(X)
	if err != nil {
		log.Fatal("cannot generate window %v\n", err)
		return nil
	}

	width, height := 800, 600
	win.Create(X.RootWin(), 0, 0, width, height, xproto.CwBackPixel, 0x0)

	win.WMGracefulClose(func(w *xwindow.Window) {
		xevent.Detach(w.X, w.Id)
		keybind.Detach(w.X, w.Id)
		mousebind.Detach(w.X, w.Id)
		w.Destroy()
		xevent.Quit(w.X)
	})

	icccm.WmStateSet(X, win.Id, &icccm.WmState{
		State: icccm.StateNormal,
	})

	win.Listen(xproto.EventMaskKeyPress)
	win.Clear(0, 0, 0, 0)
	win.Map()

	self := &Window{
		win,
		nil,
		false,
		nil,
	}
	self.bindKeys()

	return self
}

func makeWindow(ximage *xgraphics.Image) (*xwindow.Window, *bool) {
	w, h := ximage.Rect.Dx(), ximage.Rect.Dy()

	window, err := xwindow.Generate(ximage.X)
	if err != nil {
		xgbutil.Logger.Printf("Could not generate new window id: %s", err)
		return nil, nil
	}

	window.Create(ximage.X.RootWin(), 0, 0, w, h, xproto.CwBackPixel, 0x00000000)
	window.Listen(xproto.EventMaskExposure,
		xproto.EventMaskKeyPress,
		xproto.EventMaskStructureNotify,
		xproto.EventMaskVisibilityChange)

	window.WMGracefulClose(func(w *xwindow.Window) {
		xevent.Detach(w.X, w.Id)
		keybind.Detach(w.X, w.Id)
		mousebind.Detach(w.X, w.Id)
		w.Destroy()
		xevent.Quit(w.X)
	})

	err = icccm.WmStateSet(ximage.X, window.Id, &icccm.WmState{
		State: icccm.StateNormal,
	})
	if err != nil {
		xgbutil.Logger.Printf("Could not set WM_STATE: %s", err)
	}

	err = ewmh.WmNameSet(ximage.X, window.Id, "Computer System Monitor")
	if err != nil {
		xgbutil.Logger.Printf("Could not set _NET_WM_NAME: %s", err)
	}

	err = keybind.KeyPressFun(
		func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
			err := ewmh.WmStateReq(ximage.X, window.Id, ewmh.StateToggle,
				"_NET_WM_STATE_FULLSCREEN")
			if err != nil {
				log.Fatal(err)
			}
		}).Connect(ximage.X, window.Id, "f", false)
	if err != nil {
		log.Fatal(err)
	}

	xevent.ExposeFun(
		func(xu *xgbutil.XUtil, event xevent.ExposeEvent) {
			ximage.XExpPaint(window.Id, 0, 0)
		}).Connect(ximage.X, window.Id)

	obscured := false
	xevent.VisibilityNotifyFun(
		func(xu *xgbutil.XUtil, event xevent.VisibilityNotifyEvent) {
			obscured = event.State == xproto.VisibilityFullyObscured
		}).Connect(ximage.X, window.Id)

	window.Map()

	return window, &obscured
}

//.........这里部分代码省略.........
		"_NET_WM_ACTION_STICK",
		"_NET_WM_ACTION_MAXIMIZE_HORZ",
		"_NET_WM_ACTION_MAXIMIZE_VERT",
		"_NET_WM_ACTION_FULLSCREEN",
		"_NET_WM_ACTION_CHANGE_DESKTOP",
		"_NET_WM_ACTION_CLOSE",
		"_NET_WM_ACTION_ABOVE",
		"_NET_AM_ACTION_BELOW",
		"_NET_WM_STRUT_PARTIAL",
		"_NET_WM_ICON",
		"_NET_FRAME_EXTENTS",
		"WM_TRANSIENT_FOR",
	})

	// create wm window
	win, _ := xwindow.Create(X, root.Id)

	xproto.MapWindow(X.Conn(), win.Id)

	atomValues := make([]xproto.Atom, len(atomNames))
	for num, cookie := range cookies {
		reply, _ := cookie.Reply()
		atomValues[num] = reply.Atom
	}

	/* take WM_S0 selection last, which
	 * signals to Xwayland that we're done with setup. */
	xproto.SetSelectionOwner(X.Conn(), win.Id,
		atomValues[3],
		xproto.TimeCurrentTime,
	)

	mapResquest := func(event xgb.Event) {
		ev, _ := event.(xproto.MapRequestEvent)
		log.Info("MapRequest: ", ev)

		xproto.MapWindow(X.Conn(), ev.Window)
		icccm.WmStateSet(X, ev.Window, &icccm.WmState{
			State: icccm.StateNormal,
			Icon:  ev.Window,
		})
		// TODO: set _net_wm_state
	}

	for {
		x := X.Conn()
		ev, xerr := x.WaitForEvent()
		if ev == nil && xerr == nil {
			fmt.Println("Both event and error are nil. Exiting...")
			return
		}
		// if ev != nil {
		// 	fmt.Printf("Event: %s\n", ev)
		// }
		if xerr != nil {
			fmt.Printf("Error: %s\n", xerr)
		}

		switch ev.(type) {
		case xproto.CreateNotifyEvent:
			createNotify(X, ev)
			fmt.Printf("Event: %s\n", ev)
		case xproto.DestroyNotifyEvent:
			destroyNotify(X, ev)
			fmt.Printf("Event: %s\n", ev)
		case xproto.MapRequestEvent:
			mapResquest(ev)
		case xproto.ConfigureNotifyEvent:
			configureNotify(X, ev)
		case xproto.PropertyNotifyEvent:
			fmt.Printf("Event: %s\n", ev)
		case xproto.ClientMessageEvent:
			clientMessage(X, ev)
		case xproto.ConfigureRequestEvent:
			configureRequest(X, ev)
		case xproto.UnmapNotifyEvent:
			unmapNotify(X, ev)
		default:
			log.Info("Event:", ev)
		}

	}

	// xevent.MapRequestFun(
	// 	func(X *xgbutil.XUtil, e xevent.MapRequestEvent) {
	// 		println(e.Window)
	// 	}).Connect(X, root.Id)

	// xevent.ConfigureNotifyFun(
	// 	func(X *xgbutil.XUtil, e xevent.ConfigureNotifyEvent) {
	// 		fmt.Printf("(%d, %d) %dx%d\n", e.X, e.Y, e.Width, e.Height)
	// 	}).Connect(X, root.Id)

	// xevent.FocusInFun(
	// 	func(X *xgbutil.XUtil, e xevent.FocusInEvent) {
	// 		fmt.Printf("(%v, %v)\n", e.Mode, e.Detail)
	// 	}).Connect(X, root.Id)

	// xevent.Main(X)
}