func (hds *Heads) ApplyStruts(clients Clients) {
	hds.workarea = make(xinerama.Heads, len(hds.geom))
	for i, hd := range hds.geom {
		hds.workarea[i] = xrect.New(hd.X(), hd.Y(), hd.Width(), hd.Height())
	}

	rgeom := xwindow.RootGeometry(hds.X)
	for i := 0; i < clients.Len(); i++ {
		c := clients.Get(i)

		strut, _ := ewmh.WmStrutPartialGet(hds.X, c.Id())
		if strut == nil {
			continue
		}
		xrect.ApplyStrut(hds.workarea, rgeom.Width(), rgeom.Height(),
			strut.Left, strut.Right, strut.Top, strut.Bottom,
			strut.LeftStartY, strut.LeftEndY,
			strut.RightStartY, strut.RightEndY,
			strut.TopStartX, strut.TopEndX,
			strut.BottomStartX, strut.BottomEndX)
	}
	for _, wrk := range hds.workspaces.Wrks {
		wrk.Place()
	}
}

func query(X *xgbutil.XUtil) xinerama.Heads {
	if X.ExtInitialized("XINERAMA") {
		heads, err := xinerama.PhysicalHeads(X)
		if err != nil || len(heads) == 0 {
			if err == nil {
				logger.Warning.Printf("Could not find any physical heads " +
					"with the Xinerama extension.")
			} else {
				logger.Warning.Printf("Could not load physical heads via "+
					"Xinerama: %s", err)
			}
			logger.Warning.Printf("Assuming one head with size equivalent " +
				"to the root window.")
		} else {
			return heads
		}
	}

	// If we're here, then something went wrong or the Xinerama extension
	// isn't available. So query the root window for its geometry and use that.
	rgeom := xwindow.RootGeometry(X)
	return xinerama.Heads{
		xrect.New(rgeom.X(), rgeom.Y(), rgeom.Width(), rgeom.Height()),
	}
}

func main() {
	X, err := xgbutil.NewConn()
	if err != nil {
		log.Fatalln(err)
	}

	// The message box uses the keybind module, so we must initialize it.
	keybind.Initialize(X)

	// Creating a new message prompt is as simple as supply an X connection,
	// a theme and a configuration. We use built in defaults here.
	msgPrompt := prompt.NewMessage(X,
		prompt.DefaultMessageTheme, prompt.DefaultMessageConfig)

	// Show maps the message prompt window.
	// If a duration is specified, the window does NOT acquire focus and
	// automatically disappears after the specified time.
	// If a duration is not specified (i.e., '0'), then the window is mapped,
	// and acquires focus. It does not disappear until it loses focus or when
	// the user hits the "confirm" or "cancel" keys (usually "enter" and
	// "escape").
	timeout := 2 * time.Second // or "0" for no timeout.
	msgPrompt.Show(xwindow.RootGeometry(X), "Hello, world!", timeout, hidden)

	xevent.Main(X)
}

func ewmhDesktopGeometry() {
	rgeom := xwindow.RootGeometry(X)

	ewmh.DesktopGeometrySet(X,
		&ewmh.DesktopGeometry{
			Width:  rgeom.Width(),
			Height: rgeom.Height(),
		})
}

func getPrimaryScreenBestResolution() (w uint16, h uint16) {
	// if connect to x failed, just return 1024x768
	w, h = 1024, 768

	XU, err := xgbutil.NewConn()
	if err != nil {
		return
	}
	err = randr.Init(XU.Conn())
	if err != nil {
		return
	}
	_, err = randr.QueryVersion(XU.Conn(), 1, 4).Reply()
	if err != nil {
		return
	}
	Root := xproto.Setup(XU.Conn()).DefaultScreen(XU.Conn()).Root
	resources, err := randr.GetScreenResources(XU.Conn(), Root).Reply()
	if err != nil {
		return
	}

	bestModes := make([]uint32, 0)
	for _, output := range resources.Outputs {
		reply, err := randr.GetOutputInfo(XU.Conn(), output, 0).Reply()
		if err == nil && reply.NumModes > 1 {
			bestModes = append(bestModes, uint32(reply.Modes[0]))
		}
	}

	w, h = 0, 0
	for _, m := range resources.Modes {
		for _, id := range bestModes {
			if id == m.Id {
				bw, bh := m.Width, m.Height
				if w == 0 || h == 0 {
					w, h = bw, bh
				} else if uint32(bw)*uint32(bh) < uint32(w)*uint32(h) {
					w, h = bw, bh
				}
			}
		}
	}

	if w == 0 || h == 0 {
		// get resource failed, use root window's geometry
		rootRect := xwindow.RootGeometry(XU)
		w, h = uint16(rootRect.Width()), uint16(rootRect.Height())
	}

	if w == 0 || h == 0 {
		w, h = 1024, 768 // default value
	}

	logger.Debugf("primary screen's best resolution is %dx%d", w, h)
	return
}

func (wrk *Sticky) HeadGeom() xrect.Rect {
	return xwindow.RootGeometry(wrk.X)
}