//go:build linux

package application

import (
	"fmt"
	"time"

	"github.com/bep/debounce"
	"github.com/wailsapp/wails/v3/internal/assetserver"
	"github.com/wailsapp/wails/v3/internal/capabilities"
	"github.com/wailsapp/wails/v3/internal/runtime"
	"github.com/wailsapp/wails/v3/pkg/events"
)

type dragInfo struct {
	XRoot       int
	YRoot       int
	DragTime    uint32
	MouseButton uint
}

type linuxWebviewWindow struct {
	id            uint
	application   pointer
	window        pointer
	webview       pointer
	parent        *WebviewWindow
	menubar       pointer
	vbox          pointer
	menu          *Menu
	accels        pointer
	lastWidth     int
	lastHeight    int
	drag          dragInfo
	lastX, lastY  int
	gtkmenu       pointer
	ctxMenuOpened bool

	moveDebouncer     func(func())
	resizeDebouncer   func(func())
	ignoreMouseEvents bool
}

var (
	registered bool = false // avoid 'already registered message' about 'wails://'
)

func (w *linuxWebviewWindow) endDrag(button uint, x, y int) {
	w.drag.XRoot = 0.0
	w.drag.YRoot = 0.0
	w.drag.DragTime = 0
}

func (w *linuxWebviewWindow) connectSignals() {
	cb := func(e events.WindowEventType) {
		w.parent.emit(e)
	}
	w.setupSignalHandlers(cb)
}

func (w *linuxWebviewWindow) openContextMenu(menu *Menu, data *ContextMenuData) {
	// Create the menu manually because we don't want a gtk_menu_bar
	// as the top-level item
	ctxMenu := &linuxMenu{
		menu: menu,
	}
	if menu.impl == nil {
		ctxMenu.update()

		native := ctxMenu.menu.impl.(*linuxMenu).native
		w.contextMenuSignals(native)
	}

	native := ctxMenu.menu.impl.(*linuxMenu).native
	w.contextMenuShow(native, data)
}

func (w *linuxWebviewWindow) focus() {
	w.present()
}

func (w *linuxWebviewWindow) isNormal() bool {
	return !w.isMinimised() && !w.isMaximised() && !w.isFullscreen()
}

func (w *linuxWebviewWindow) setCloseButtonEnabled(enabled bool) {
	//	C.enableCloseButton(w.nsWindow, C.bool(enabled))
}

func (w *linuxWebviewWindow) setFullscreenButtonEnabled(enabled bool) {
	// Not implemented
}

func (w *linuxWebviewWindow) setMinimiseButtonEnabled(enabled bool) {
	//C.enableMinimiseButton(w.nsWindow, C.bool(enabled))
}

func (w *linuxWebviewWindow) setMaximiseButtonEnabled(enabled bool) {
	//C.enableMaximiseButton(w.nsWindow, C.bool(enabled))
}

func (w *linuxWebviewWindow) disableSizeConstraints() {
	x, y, width, height, scaleFactor := w.getCurrentMonitorGeometry()
	w.setMinMaxSize(x, y, width*scaleFactor, height*scaleFactor)
}

func (w *linuxWebviewWindow) unminimise() {
	w.present()
}

func (w *linuxWebviewWindow) on(eventID uint) {
	// TODO: Test register/unregister listener for linux events
	//C.registerListener(C.uint(eventID))
}

func (w *linuxWebviewWindow) zoom() {
	w.zoomIn()
}

func (w *linuxWebviewWindow) windowZoom() {
	w.zoom() // FIXME> This should be removed
}

func (w *linuxWebviewWindow) forceReload() {
	w.reload()
}

func (w *linuxWebviewWindow) center() {
	x, y, width, height, _ := w.getCurrentMonitorGeometry()
	if x == -1 && y == -1 && width == -1 && height == -1 {
		return
	}
	windowWidth, windowHeight := w.size()

	newX := ((width - windowWidth) / 2) + x
	newY := ((height - windowHeight) / 2) + y

	// Place the window at the center of the monitor
	w.move(newX, newY)
}

func (w *linuxWebviewWindow) restore() {
	// restore window to normal size
	// FIXME: never called!  - remove from webviewImpl interface
}

func newWindowImpl(parent *WebviewWindow) *linuxWebviewWindow {
	//	(*C.struct__GtkWidget)(m.native)
	//var menubar *C.struct__GtkWidget
	result := &linuxWebviewWindow{
		application: getNativeApplication().application,
		parent:      parent,
		//		menubar:     menubar,
	}
	return result
}

func (w *linuxWebviewWindow) setMinMaxSize(minWidth, minHeight, maxWidth, maxHeight int) {
	// Get current screen for window
	_, _, monitorwidth, monitorheight, _ := w.getCurrentMonitorGeometry()
	if monitorwidth == -1 {
		monitorwidth = 1920
	}
	if monitorheight == -1 {
		monitorheight = 1080
	}
	if maxWidth == 0 {
		maxWidth = monitorwidth
	}
	if maxHeight == 0 {
		maxHeight = monitorheight
	}
	windowSetGeometryHints(w.window, minWidth, minHeight, maxWidth, maxHeight)
}

func (w *linuxWebviewWindow) setMinSize(width, height int) {
	w.setMinMaxSize(width, height, w.parent.options.MaxWidth, w.parent.options.MaxHeight)
}

func (w *linuxWebviewWindow) getBorderSizes() *LRTB {
	return &LRTB{}
}

func (w *linuxWebviewWindow) setMaxSize(width, height int) {
	w.setMinMaxSize(w.parent.options.MinWidth, w.parent.options.MinHeight, width, height)
}

func (w *linuxWebviewWindow) setRelativePosition(x, y int) {
	mx, my, _, _, _ := w.getCurrentMonitorGeometry()
	w.move(x+mx, y+my)
}

func (w *linuxWebviewWindow) width() int {
	width, _ := w.size()
	return width
}

func (w *linuxWebviewWindow) height() int {
	_, height := w.size()
	return height
}

func (w *linuxWebviewWindow) setPosition(x int, y int) {
	// Set the window's absolute position
	w.move(x, y)
}

func (w *linuxWebviewWindow) bounds() Rect {
	// DOTO: do it in a single step + proper DPI scaling
	x, y := w.position()
	width, height := w.size()

	return Rect{
		X:      x,
		Y:      y,
		Width:  width,
		Height: height,
	}
}

func (w *linuxWebviewWindow) setBounds(bounds Rect) {
	// DOTO: do it in a single step + proper DPI scaling
	w.move(bounds.X, bounds.Y)
	w.setSize(bounds.Width, bounds.Height)

}

func (w *linuxWebviewWindow) physicalBounds() Rect {
	// TODO: proper DPI scaling
	return w.bounds()
}

func (w *linuxWebviewWindow) setPhysicalBounds(physicalBounds Rect) {
	// TODO: proper DPI scaling
	w.setBounds(physicalBounds)
}

func (w *linuxWebviewWindow) run() {
	for eventId := range w.parent.eventListeners {
		w.on(eventId)
	}

	if w.moveDebouncer == nil {
		debounceMS := w.parent.options.Linux.WindowDidMoveDebounceMS
		if debounceMS == 0 {
			debounceMS = 50 // Default value
		}
		w.moveDebouncer = debounce.New(time.Duration(debounceMS) * time.Millisecond)
	}
	if w.resizeDebouncer == nil {
		debounceMS := w.parent.options.Linux.WindowDidMoveDebounceMS
		if debounceMS == 0 {
			debounceMS = 50 // Default value
		}
		w.resizeDebouncer = debounce.New(time.Duration(debounceMS) * time.Millisecond)
	}

	// Register the capabilities
	globalApplication.capabilities = capabilities.NewCapabilities()

	app := getNativeApplication()

	var menu = w.menu
	if menu != nil {
		InvokeSync(func() {
			menu.Update()
		})
		w.menu = menu
		w.gtkmenu = (menu.impl).(*linuxMenu).native
	}

	w.window, w.webview, w.vbox = windowNew(app.application, w.gtkmenu, w.parent.id, w.parent.options.Linux.WebviewGpuPolicy)
	app.registerWindow(w.window, w.parent.id) // record our mapping
	w.connectSignals()
	if w.parent.options.EnableDragAndDrop {
		w.enableDND()
	}
	w.setTitle(w.parent.options.Title)
	w.setIcon(app.icon)
	w.setAlwaysOnTop(w.parent.options.AlwaysOnTop)
	w.setResizable(!w.parent.options.DisableResize)
	// Set min/max size with defaults
	// Default min: 1x1 (smallest possible)
	// Default max: 0x0 (uses screen size)
	minWidth := w.parent.options.MinWidth
	if minWidth == 0 {
		minWidth = 1
	}
	minHeight := w.parent.options.MinHeight
	if minHeight == 0 {
		minHeight = 1
	}
	maxWidth := w.parent.options.MaxWidth
	maxHeight := w.parent.options.MaxHeight

	w.setMinMaxSize(minWidth, minHeight, maxWidth, maxHeight)
	w.setDefaultSize(w.parent.options.Width, w.parent.options.Height)
	w.setSize(w.parent.options.Width, w.parent.options.Height)
	w.setZoom(w.parent.options.Zoom)
	if w.parent.options.BackgroundType != BackgroundTypeSolid {
		w.setTransparent()
		w.setBackgroundColour(w.parent.options.BackgroundColour)
	}

	w.setFrameless(w.parent.options.Frameless)

	if w.parent.options.InitialPosition == WindowCentered {
		w.center()
	} else {
		w.setPosition(w.parent.options.X, w.parent.options.Y)
	}

	switch w.parent.options.StartState {
	case WindowStateMaximised:
		w.maximise()
	case WindowStateMinimised:
		w.minimise()
	case WindowStateFullscreen:
		w.fullscreen()
	case WindowStateNormal:
	}

	// Ignore mouse events if requested
	w.setIgnoreMouseEvents(w.parent.options.IgnoreMouseEvents)

	startURL, err := assetserver.GetStartURL(w.parent.options.URL)
	if err != nil {
		globalApplication.fatal(err.Error())
	}

	w.setURL(startURL)
	w.parent.OnWindowEvent(events.Linux.WindowLoadChanged, func(_ *WindowEvent) {
		InvokeAsync(func() {
			if w.parent.options.JS != "" {
				w.execJS(w.parent.options.JS)
			}
			if w.parent.options.CSS != "" {
				js := fmt.Sprintf("(function() { var style = document.createElement('style'); style.appendChild(document.createTextNode('%s')); document.head.appendChild(style); })();", w.parent.options.CSS)
				w.execJS(js)
			}
		})
	})

	w.parent.RegisterHook(events.Linux.WindowLoadChanged, func(e *WindowEvent) {
		w.execJS(runtime.Core())
	})
	if w.parent.options.HTML != "" {
		w.setHTML(w.parent.options.HTML)
	}
	if !w.parent.options.Hidden {
		w.show()
		if w.parent.options.InitialPosition == WindowCentered {
			w.center()
		} else {
			w.setRelativePosition(w.parent.options.X, w.parent.options.Y)
		}
	}
	if w.parent.options.DevToolsEnabled || globalApplication.isDebugMode {
		w.enableDevTools()
		if w.parent.options.OpenInspectorOnStartup {
			w.openDevTools()
		}
	}
}

func (w *linuxWebviewWindow) startResize(border string) error {
	// FIXME: what do we need to do here?
	return nil
}

func (w *linuxWebviewWindow) nativeWindowHandle() uintptr {
	return uintptr(w.window)
}

func (w *linuxWebviewWindow) print() error {
	w.execJS("window.print();")
	return nil
}

func (w *linuxWebviewWindow) handleKeyEvent(acceleratorString string) {
	// Parse acceleratorString
	// accelerator, err := parseAccelerator(acceleratorString)
	// if err != nil {
	// 	globalApplication.error("unable to parse accelerator: %s", err.Error())
	// 	return
	// }
	w.parent.processKeyBinding(acceleratorString)
}

// SetMinimiseButtonState is unsupported on Linux
func (w *linuxWebviewWindow) setMinimiseButtonState(state ButtonState) {}

// SetMaximiseButtonState is unsupported on Linux
func (w *linuxWebviewWindow) setMaximiseButtonState(state ButtonState) {}

// SetCloseButtonState is unsupported on Linux
func (w *linuxWebviewWindow) setCloseButtonState(state ButtonState) {}

func (w *linuxWebviewWindow) isIgnoreMouseEvents() bool {
	return w.ignoreMouseEvents
}

func (w *linuxWebviewWindow) setIgnoreMouseEvents(ignore bool) {
	w.ignoreMouse(w.ignoreMouseEvents)
}

func (w *linuxWebviewWindow) showMenuBar()   {}
func (w *linuxWebviewWindow) hideMenuBar()   {}
func (w *linuxWebviewWindow) toggleMenuBar() {}