//go:build darwin
// +build darwin

package darwin

import "C"
import (
	"context"
	"encoding/json"
	"html/template"
	"log"
	"runtime"

	"github.com/wailsapp/wails/v2/internal/binding"
	"github.com/wailsapp/wails/v2/internal/frontend"
	"github.com/wailsapp/wails/v2/internal/frontend/assetserver"
	"github.com/wailsapp/wails/v2/internal/logger"
	"github.com/wailsapp/wails/v2/pkg/options"
)

var messageBuffer = make(chan string)

type Frontend struct {

	// Context
	ctx context.Context

	frontendOptions *options.App
	logger          *logger.Logger
	debug           bool

	// Assets
	assets *assetserver.DesktopAssetServer

	// main window handle
	mainWindow                               *Window
	minWidth, minHeight, maxWidth, maxHeight int
	bindings                                 *binding.Bindings
	dispatcher                               frontend.Dispatcher
	servingFromDisk                          bool
}

func NewFrontend(ctx context.Context, appoptions *options.App, myLogger *logger.Logger, appBindings *binding.Bindings, dispatcher frontend.Dispatcher) *Frontend {

	result := &Frontend{
		frontendOptions: appoptions,
		logger:          myLogger,
		bindings:        appBindings,
		dispatcher:      dispatcher,
		ctx:             ctx,
		minHeight:       appoptions.MinHeight,
		minWidth:        appoptions.MinWidth,
		maxHeight:       appoptions.MaxHeight,
		maxWidth:        appoptions.MaxWidth,
	}

	// Check if we have been given a directory to serve assets from.
	// If so, this means we are in dev mode and are serving assets off disk.
	// We indicate this through the `servingFromDisk` flag to ensure requests
	// aren't cached by WebView2 in dev mode
	_assetdir := ctx.Value("assetdir")
	if _assetdir != nil {
		result.servingFromDisk = true
	}

	bindingsJSON, err := appBindings.ToJSON()
	if err != nil {
		log.Fatal(err)
	}
	assets, err := assetserver.NewDesktopAssetServer(ctx, appoptions.Assets, bindingsJSON)
	if err != nil {
		log.Fatal(err)
	}
	result.assets = assets

	go result.startMessageProcessor(ctx)

	return result
}

func (f *Frontend) startMessageProcessor(ctx context.Context) {
	for message := range messageBuffer {
		f.processMessage(message)
	}
}

func (f *Frontend) WindowReload() {
	f.ExecJS("runtime.WindowReload();")
}

func (f *Frontend) Run(ctx context.Context) error {

	f.ctx = context.WithValue(ctx, "frontend", f)

	mainWindow := NewWindow(f.frontendOptions)
	f.mainWindow = mainWindow
	//go func() {
	//	time.Sleep(3 * time.Second)
	//	mainWindow.Center()
	//}()
	//
	//var _debug = ctx.Value("debug")
	//if _debug != nil {
	//	f.debug = _debug.(bool)
	//}
	//
	//f.WindowCenter()
	//f.setupChromium()
	//
	//mainWindow.OnSize().Bind(func(arg *winc.Event) {
	//	f.chromium.Resize()
	//})
	//
	//mainWindow.OnClose().Bind(func(arg *winc.Event) {
	//	if f.frontendOptions.HideWindowOnClose {
	//		f.WindowHide()
	//	} else {
	//		f.Quit()
	//	}
	//})
	//
	//// TODO: Move this into a callback from frontend
	//go func() {
	//	if f.frontendOptions.OnStartup != nil {
	//		f.frontendOptions.OnStartup(f.ctx)
	//	}
	//}()
	//
	mainWindow.Run()
	return nil
}

func (f *Frontend) WindowCenter() {
	runtime.LockOSThread()
	//f.mainWindow.Center()
}

func (f *Frontend) WindowSetPos(x, y int) {
	runtime.LockOSThread()
	//f.mainWindow.SetPos(x, y)
}
func (f *Frontend) WindowGetPos() (int, int) {
	runtime.LockOSThread()
	//return f.mainWindow.Pos()
	return 0, 0
}

func (f *Frontend) WindowSetSize(width, height int) {
	runtime.LockOSThread()
	//f.mainWindow.SetSize(width, height)
}

func (f *Frontend) WindowGetSize() (int, int) {
	runtime.LockOSThread()
	//return f.mainWindow.Size()
	return 0, 0
}

func (f *Frontend) WindowSetTitle(title string) {
	runtime.LockOSThread()
	//f.mainWindow.SetText(title)
}

func (f *Frontend) WindowFullscreen() {
	runtime.LockOSThread()
	//f.mainWindow.SetMaxSize(0, 0)
	//f.mainWindow.SetMinSize(0, 0)
	//f.mainWindow.Fullscreen()
}

func (f *Frontend) WindowUnFullscreen() {
	runtime.LockOSThread()
	//f.mainWindow.UnFullscreen()
	//f.mainWindow.SetMaxSize(f.maxWidth, f.maxHeight)
	//f.mainWindow.SetMinSize(f.minWidth, f.minHeight)
}

func (f *Frontend) WindowShow() {
	runtime.LockOSThread()
	//f.mainWindow.Show()
}

func (f *Frontend) WindowHide() {
	runtime.LockOSThread()
	//f.mainWindow.Hide()
}
func (f *Frontend) WindowMaximise() {
	runtime.LockOSThread()
	//f.mainWindow.Maximise()
}
func (f *Frontend) WindowUnmaximise() {
	runtime.LockOSThread()
	//f.mainWindow.Restore()
}
func (f *Frontend) WindowMinimise() {
	runtime.LockOSThread()
	//f.mainWindow.Minimise()
}
func (f *Frontend) WindowUnminimise() {
	runtime.LockOSThread()
	//f.mainWindow.Restore()
}

func (f *Frontend) WindowSetMinSize(width int, height int) {
	runtime.LockOSThread()
	f.minWidth = width
	f.minHeight = height
	//f.mainWindow.SetMinSize(width, height)
}
func (f *Frontend) WindowSetMaxSize(width int, height int) {
	runtime.LockOSThread()
	f.maxWidth = width
	f.maxHeight = height
	//f.mainWindow.SetMaxSize(width, height)
}

func (f *Frontend) WindowSetRGBA(col *options.RGBA) {
	runtime.LockOSThread()
	if col == nil {
		return
	}
	f.mainWindow.SetRGBA(col.R, col.G, col.B, col.A)
}

func (f *Frontend) Quit() {
	f.mainWindow.Quit()
}

/*
const (
	ctrlZ int = 90
	ctrlX     = 88
	ctrlC     = 67
	ctrlV     = 86
)

func (f *Frontend) setupChromium() {
	chromium := edge.NewChromium()
	f.chromium = chromium
	chromium.MessageCallback = f.processMessage
	chromium.WebResourceRequestedCallback = f.processRequest
	chromium.NavigationCompletedCallback = f.navigationCompleted
	acceleratorsWebviewShouldProcess := slicer.Int([]int{ctrlV, ctrlC, ctrlX, ctrlZ})
	chromium.AcceleratorKeyCallback = func(vkey uint) bool {
		// We want webview to handle ctrl-C, ctrl-Z, ctrl-v, ctrl-x
		if acceleratorsWebviewShouldProcess.Contains(int(vkey)) {
			return false
		}
		// Post keypress
		//w32.PostMessage(f.mainWindow.Handle(), w32.WM_KEYDOWN, uintptr(vkey), 0)
		return true
	}
	chromium.Embed(f.mainWindow.Handle())
	chromium.Resize()
	settings, err := chromium.GetSettings()
	if err != nil {
		log.Fatal(err)
	}
	err = settings.PutAreDefaultContextMenusEnabled(f.debug)
	if err != nil {
		log.Fatal(err)
	}
	err = settings.PutAreDevToolsEnabled(f.debug)
	if err != nil {
		log.Fatal(err)
	}
	err = settings.PutIsZoomControlEnabled(false)
	if err != nil {
		log.Fatal(err)
	}
	err = settings.PutIsStatusBarEnabled(false)
	if err != nil {
		log.Fatal(err)
	}
	err = settings.PutIsStatusBarEnabled(false)
	if err != nil {
		log.Fatal(err)
	}

	// Set background colour
	f.WindowSetRGBA(f.frontendOptions.RGBA)

	chromium.AddWebResourceRequestedFilter("*", edge.COREWEBVIEW2_WEB_RESOURCE_CONTEXT_ALL)
	chromium.Navigate("file://wails/")
}
*/

type EventNotify struct {
	Name string        `json:"name"`
	Data []interface{} `json:"data"`
}

func (f *Frontend) Notify(name string, data ...interface{}) {
	notification := EventNotify{
		Name: name,
		Data: data,
	}
	payload, err := json.Marshal(notification)
	if err != nil {
		f.logger.Error(err.Error())
		return
	}
	f.ExecJS(`window.wails.EventsNotify('` + template.JSEscapeString(string(payload)) + `');`)
}

//func (f *Frontend) processRequest(req *edge.ICoreWebView2WebResourceRequest, args *edge.ICoreWebView2WebResourceRequestedEventArgs) {
//	//Get the request
//	uri, _ := req.GetUri()
//
//	// Translate URI
//	uri = strings.TrimPrefix(uri, "file://wails")
//	if !strings.HasPrefix(uri, "/") {
//		return
//	}
//
//	// Load file from asset store
//	content, mimeType, err := f.assets.Load(uri)
//	if err != nil {
//		return
//	}
//
//	env := f.chromium.Environment()
//	headers := "Content-Type: " + mimeType
//	if f.servingFromDisk {
//		headers += "\nPragma: no-cache"
//	}
//	response, err := env.CreateWebResourceResponse(content, 200, "OK", headers)
//	if err != nil {
//		return
//	}
//	// Send response back
//	err = args.PutResponse(response)
//	if err != nil {
//		return
//	}
//	return
//}

func (f *Frontend) processMessage(message string) {
	if message == "drag" {
		err := f.startDrag()
		if err != nil {
			f.logger.Error(err.Error())
		}
		return
	}
	result, err := f.dispatcher.ProcessMessage(message, f)
	if err != nil {
		f.logger.Error(err.Error())
		f.Callback(result)
		return
	}
	if result == "" {
		return
	}

	switch result[0] {
	case 'c':
		// Callback from a method call
		f.Callback(result[1:])
	default:
		f.logger.Info("Unknown message returned from dispatcher: %+v", result)
	}
}

func (f *Frontend) Callback(message string) {
	//f.mainWindow.Dispatch(func() {
	//	f.chromium.Eval(`window.wails.Callback(` + strconv.Quote(message) + `);`)
	//})
}

func (f *Frontend) startDrag() error {
	//if !w32.ReleaseCapture() {
	//	return fmt.Errorf("unable to release mouse capture")
	//}
	//w32.SendMessage(f.mainWindow.Handle(), w32.WM_NCLBUTTONDOWN, w32.HTCAPTION, 0)
	return nil
}

func (f *Frontend) ExecJS(js string) {
	//f.mainWindow.Dispatch(func() {
	//	f.chromium.Eval(js)
	//})
}

//func (f *Frontend) navigationCompleted(sender *edge.ICoreWebView2, args *edge.ICoreWebView2NavigationCompletedEventArgs) {
//	if f.frontendOptions.OnDomReady != nil {
//		go f.frontendOptions.OnDomReady(f.ctx)
//	}
//
//	// If you want to start hidden, return
//	if f.frontendOptions.StartHidden {
//		return
//	}
//
//	// Hack to make it visible: https://github.com/MicrosoftEdge/WebView2Feedback/issues/1077#issuecomment-825375026
//	err := f.chromium.Hide()
//	if err != nil {
//		log.Fatal(err)
//	}
//	err = f.chromium.Show()
//	if err != nil {
//		log.Fatal(err)
//	}
//	f.mainWindow.Show()
//
//}

//export processMessage
func processMessage(message *C.char) {
	goMessage := C.GoString(message)
	messageBuffer <- goMessage
	println("Message in Go:", goMessage)
}