package client

import (
	_ "embed"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"apigo.cc/gojs"
	"apigo.cc/gojs/goja"
	"github.com/ssgo/tool/watcher"
	webview "github.com/webview/webview_go"
)

//go:embed client.ts
var clientTS string

//go:embed README.md
var clientMD string

//go:embed app.js
var appCode string

var binds = map[string]any{}
var bindsLock = sync.RWMutex{}

var windowsId uint64
var windows = map[uint64]*Webview{}
var windowsLock = sync.RWMutex{}
var waitChan chan bool

func Bind(name string, fn any) {
	bindsLock.Lock()
	binds[name] = fn
	bindsLock.Unlock()
}

func Unbind(name string) {
	bindsLock.Lock()
	delete(binds, name)
	bindsLock.Unlock()
}

type Webview struct {
	id        uint64
	w         webview.WebView
	isRunning bool
	// isAsync   bool
	isDebug   bool
	webRoot   string
	watcher   *watcher.Watcher
	html      string
	url       string
	closeChan chan bool
}

func Wait() {
	// 如果有窗口在运行，等待窗口关闭
	windowsLock.RLock()
	if len(windows) > 0 {
		waitChan = make(chan bool, 1)
	}
	windowsLock.RUnlock()

	// fmt.Println("====== wait start")
	if waitChan != nil {
		<-waitChan
		waitChan = nil
	}
	// fmt.Println("====== wait end")
}

func CloseAll() {
	windows1 := map[uint64]*Webview{}
	windowsLock.Lock()
	for id, w := range windows {
		windows1[id] = w
	}
	windowsLock.Unlock()
	for _, w := range windows1 {
		w.close()
	}
}

func (w *Webview) close() {
	// fmt.Println("====== w.Close()")
	if w.isRunning {
		w.isRunning = false
		// w.closeChan = make(chan bool, 1)
		// fmt.Println("====== w.w.Terminate()")
		w.w.Terminate()
		// fmt.Println("====== w.w.Terminate() ok")
		// <-w.closeChan
		// w.closeChan = nil
	}
}

func (w *Webview) doClose() {
	// fmt.Println("====== w.doClose()")
	if w.watcher != nil {
		w.watcher.Stop()
		w.watcher = nil
	}
	windowsLock.Lock()
	delete(windows, w.id)
	n := len(windows)
	windowsLock.Unlock()

	// fmt.Println("====== w.w.Destroy()")
	w.w.Destroy()
	// fmt.Println("====== w.w.Destroy() ok")

	// 解除 w.Close 的等待
	if w.closeChan != nil {
		w.closeChan <- true
	}

	// 解除 gojs.WaitAll 的等待
	if waitChan != nil && n == 0 {
		waitChan <- true
	}
}

func (w *Webview) loadHtml(html string) {
	w.w.SetHtml(html)
}

func (w *Webview) loadURL(url string) {
	if url != "" {
		if strings.Contains(url, "://") {
			w.w.Navigate(url)
		} else {
			if !filepath.IsAbs(url) {
				curPath, _ := os.Getwd()
				url = filepath.Join(curPath, url)
			}
			w.webRoot = filepath.Dir(url)
			url = "file://" + url
			w.w.Navigate(url)
		}
	}
	w.w.Navigate(url)
}

func (w *Webview) reload() {
	if w.html != "" {
		w.loadHtml(w.html)
	} else {
		w.loadURL(w.url)
	}
}

func (w *Webview) setTitle(title string) {
	w.w.SetTitle(title)
}

func (w *Webview) setSize(width int, height int, sizeMode string) {
	w.w.SetSize(width, height, getSizeMode(sizeMode))
}

func (w *Webview) eval(code string) {
	w.w.Eval(code)
}

func (w *Webview) Close(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	w.close()
	return nil
}

func (w *Webview) LoadHtml(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(1)
	w.loadHtml(args.Str(0))
	return nil
}

func (w *Webview) LoadURL(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(1)
	w.loadURL(args.Str(0))
	return nil
}

func (w *Webview) Dispatch(f func()) {
	w.w.Dispatch(f)
}

func (w *Webview) SetTitle(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(1)
	w.setTitle(args.Str(0))
	return nil
}

func (w *Webview) SetSize(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(2)
	w.setSize(args.Int(0), args.Int(1), args.Str(2))
	return nil
}

func (w *Webview) Eval(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
	args := gojs.MakeArgs(&argsIn, vm).Check(1)
	w.eval(args.Str(0))
	return nil
}

func (w *Webview) binds() {
	tmpBinds := map[string]any{}
	bindsLock.RLock()
	for k, v := range binds {
		tmpBinds[k] = v
	}
	bindsLock.RUnlock()
	for k, v := range tmpBinds {
		_ = w.w.Bind(k, v)
	}
	_ = w.w.Bind("__closeWindow", w.close)
	_ = w.w.Bind("__setTitle", w.setTitle)
	_ = w.w.Bind("__setSize", w.setSize)
	_ = w.w.Bind("__eval", w.eval)
	w.w.Init(appCode)
}

func getSizeMode(sizeMode string) webview.Hint {
	switch sizeMode {
	case "none":
		return webview.HintNone
	case "fixed":
		return webview.HintFixed
	case "min":
		return webview.HintMin
	case "max":
		return webview.HintMax
	default:
		return webview.HintNone
	}
}

func init() {
	obj := map[string]any{
		"open": func(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
			args := gojs.MakeArgs(&argsIn, vm)
			title := ""
			width := 800
			height := 600
			sizeMode := "none"
			isDebug := false
			html := ""
			url := ""
			if opt := args.Obj(0); opt != nil {
				if titleV := opt.Str("title"); titleV != "" {
					title = titleV
				}
				if widthV := opt.Int("width"); widthV != 0 {
					width = widthV
				}
				if heightV := opt.Int("height"); heightV != 0 {
					height = heightV
				}
				if sizeModeV := opt.Str("sizeMode"); sizeModeV != "" {
					sizeMode = sizeModeV
				}
				if isDebugV := opt.Bool("isDebug"); isDebugV {
					isDebug = isDebugV
				}
				if htmlV := opt.Str("html"); htmlV != "" {
					html = htmlV
				}
				if urlV := opt.Str("url"); urlV != "" {
					url = urlV
					if strings.HasPrefix(url, "file://") {
						url = url[7:]
					}
				}
			}

			w := &Webview{isDebug: isDebug, html: html, url: url}
			// startChan := make(chan bool, 1)
			gojs.RunInMain(func() {
				windowsLock.Lock()
				w.id = windowsId
				windowsId++
				windows[w.id] = w
				windowsLock.Unlock()
				w.w = webview.New(isDebug)
				w.w.SetTitle(title)
				w.w.SetSize(width, height, getSizeMode(sizeMode))
				w.binds()

				if w.isDebug {
					var isWaitingRun = false
					if w.webRoot == "" && w.html != "" {
						w.webRoot = "."
					}
					if w.webRoot != "" {
						w.watcher, _ = watcher.Start([]string{w.webRoot}, []string{"html", "js", "css"}, func(filename string, event string) {
							if !isWaitingRun {
								isWaitingRun = true
								go func() {
									time.Sleep(time.Millisecond * 10)
									isWaitingRun = false
									w.w.Eval("location.reload()")
								}()
							}
						})
					}
				}

				w.isRunning = true

				w.reload()
				// startChan <- true
				w.w.Run()
				// fmt.Println("====== w.w.Run() end")
				w.doClose()
			})

			// <-startChan
			return vm.ToValue(gojs.MakeMap(w))
		},
		"closeAll": func(argsIn goja.FunctionCall, vm *goja.Runtime) goja.Value {
			CloseAll()
			return nil
		},
	}

	gojs.Register("apigo.cc/gojs/client", gojs.Module{
		Object:      obj,
		Desc:        "web client framework by github.com/webview/webview",
		TsCode:      clientTS,
		Example:     clientMD,
		WaitForStop: Wait,
		OnKill:      CloseAll,
	})
}