package gui

import (
	"errors"
	"os"
	"runtime/debug"
	"time"

	"go.wit.com/lib/protobuf/guipb"
	"go.wit.com/log"
	"go.wit.com/widget"
)

// const Xaxis = 0 // stack things horizontally
// const Yaxis = 1 // stack things vertically

func initNew() {
	defer func() {
		if r := recover(); r != nil {
			crash(r, "watchCallback()")
		}
	}()
	log.Log(INFO, "init() has been run")

	me.counter = 0
	// me.prefix = "wit"

	// Populates the top of the binary tree
	me.rootNode = addNode()
	me.rootNode.progname = "guiBinaryTree"
	me.rootNode.WidgetType = widget.Root
	me.rootNode.hidden = false // always send the rootNode to the toolkits

	me.widgets = guipb.NewWidgets()

	// used to pass debugging flags to the toolkit plugins
	flag := me.rootNode.newNode("flag", 0)
	flag.WidgetType = widget.Flag

	flag = me.rootNode.newNode("stdout", 0)
	flag.WidgetType = widget.Stdout

	me.guiChan = make(chan widget.Action, 1)

	version, err := getGuiVersion()
	log.Println("GO GUI version", version, showVersion()+"<Bromeliaceae>", err)
	if version == "" {
		log.Warn("Warning: compiled without version", err)
		log.Sleep(1)
	}
	go watchCallback()
}

// what genius figured this out?
// originally from github.com/dimasma0305/GoFetch
func showVersion() string {
	// var runes rune
	// color1 := "\x1b[0;29m  \x1b[0m"
	// runes = []rune(color1)
	// view.WriteRunes(runes)

	color1 := "\x1b[0;29m  \x1b[0m"
	color2 := "\x1b[0;31m  \x1b[0m"
	color3 := "\x1b[0;32m  \x1b[0m"
	color4 := "\x1b[0;33m  \x1b[0m"
	color5 := "\x1b[0;34m  \x1b[0m"
	color6 := "\x1b[0;35m  \x1b[0m"
	color7 := "\x1b[0;36m  \x1b[0m"
	color8 := "\x1b[0;37m  \x1b[0m"

	return color1 + " " + color2 + " " + color3 + " " + color4 + " " + color5 + " " + color6 + " " + color7 + " " + color8
}

var GUIVERSION string

func getGuiVersion() (string, error) {
	var found string
	tmp, ok := debug.ReadBuildInfo()
	if !ok {
		return "", errors.New("debug.ReadBuildInfo() not ok")
	}
	if tmp == nil {
		return "", errors.New("compiled without GO module support")
	}
	// log.Println("mod.Path         = ", tmp.Path)
	// log.Println("mod.Main.Path    = ", tmp.Main.Path)
	// log.Println("mod.Main.Version = ", tmp.Main.Version)
	// log.Println("mod.Main.Sum     = ", tmp.Main.Sum)
	for _, value := range tmp.Deps {
		if value.Path == "go.wit.com/gui" {
			found = value.Version
		}
		// log.Println("\tmod.Path    = ", value.Path)
		// log.Println("\tmod.Version = ", value.Version)
	}
	if found != "" {
		// log.Println("GUI build version:", found)
		return found, nil
	}
	if GUIVERSION != "" {
		// log.Println("GUI build ldflag:", GUIVERSION)
		return GUIVERSION, nil
	}
	if os.Getenv("GUIVERSION") != "" {
		found = os.Getenv("GUIVERSION") + "-dirty"
		// log.Println("GUI build $GUIVERSION", found)
		return found, nil
	}
	found = "pre-v1-GO111"
	// log.Println("GUI build version:", found)
	return found, errors.New("GO111 developer build")
}

// lookup the widget by the id sent from the toolkit
func (n *Node) findId(i int) *Node {
	if n == nil {
		return nil
	}

	if n.id == i {
		return n
	}

	for _, child := range n.children {
		newN := child.findId(i)
		if newN != nil {
			return newN
		}
	}
	return nil
}

func pluginCounter(a *widget.Action) {
	var found bool = false
	for _, aplug := range allPlugins {
		if a.ProgName == aplug.name {
			aplug.count += 1
			found = true
		}
	}
	if !found {
		// TODO: fix this by making seperate channels for each plugin?
		log.Log(WARN, "ListToolkits() got event from unidentified plugin")
	}
}

func UnloadToolkits() {
	if me.rootNode == nil {
		log.Log(INFO, "gui rootNode == nil. can't UnloadToolkits()")
		return
	}
	for _, aplug := range allPlugins {
		me.rootNode.CloseToolkit(aplug.name)
		time.Sleep(100 * time.Millisecond) // maybe a good idea for now
	}
}

func toolkitPanic(pname string) {
	log.Log(WARN, "toolkitPanic() in", pname)
	log.Log(WARN, "toolkitPanic() unload toolkit plugin here", pname)
	me.rootNode.ListToolkits()
	for _, aplug := range allPlugins {
		if aplug.name == pname {
			log.Log(WARN, "toolkitPanic() FOUND PLUGIN =", aplug.name)
			log.Log(WARN, "toolkitPanic() unload here aplug.dead =", aplug.dead)
			log.Log(WARN, "toolkitPanic() TODO: stop talking to plugin:", pname)
			aplug.dead = true
			log.Log(WARN, "toolkitPanic() unload here aplug.dead =", aplug.dead)
			// me.rootNode.CloseToolkit(aplug.name)
			// panic("panic trapped!")
			// log.Sleep(.5)
			// me.rootNode.LoadToolkit("gocui")
		}
	}
	// log.UnsetTmp()
	// StandardExit()
	log.Log(WARN, "toolkitPanic() attempt to load nocui")
	me.rootNode.LoadToolkit("nocui")
}

func crash(r any, what string) {
	log.Warn("PANIC ecovered in ", r, what)
	UnloadToolkits()
	log.Warn("PANIC ecovered in before n.Custom()", r, what)
	panic(what)
}

func watchCallback() {
	defer func() {
		if r := recover(); r != nil {
			crash(r, "watchCallback()")
		}
	}()
	log.Log(INFO, "guiChan() START")
	for {
		log.Log(CHANGE, "guiChan() select restarted")
		select {
		case a := <-me.guiChan:
			pluginCounter(&a)

			if a.ActionType == widget.ToolkitPanic {
				toolkitPanic(a.ProgName)
				break
			}

			// 99.9% of events are just widget changes
			n := me.rootNode.findId(a.WidgetId)
			if n != nil {
				log.Log(INFO, "guiChan() FOUND widget id =", n.id, n.progname)
				n.gotUserEvent(a)
				break
			}

			// if not a widget change, something more bizare
			if a.ActionType == widget.UserQuit {
				log.Log(WARN, "guiChan() User sent Quit()")
				log.Exit("wit/gui toolkit.UserQuit")
				break
			}
			if a.ActionType == widget.ToolkitLoad {
				newPlug := widget.GetString(a.Value)
				log.Log(WARN, "Attempt to load a new toolkit", newPlug, "here")
				me.rootNode.LoadToolkit(newPlug)
			}
			if a.ActionType == widget.EnableDebug {
				log.Log(WARN, "guiChan() Enable Debugging Window")
				log.Log(WARN, "guiChan() TODO: not implemented")
				log.Log(WARN, "guiChan() Listing Toolkits:")
				PLUG.SetBool(true)
				me.rootNode.ListToolkits()
				me.rootNode.ListChildren(true)
				/*
					for i, aplug := range allPlugins {
						log.Log("plug =", i, aplug.name)
						if aplug.name == "andlabs" {
							log.Log("Found plug =", i, aplug.name)
							//closePlugin(aplug)
							allPlugins = allPlugins[1:]
						}
					}
				*/
				break
			}
			log.Log(WARN, "guiChan() n == nil is widget id in a table?", a.ActionType, a.WidgetId)
			log.Log(WARN, "guiChan() todo: list tables here")
			log.Log(WARN, "guiChan() Action could not be found or handled", a.ActionType, a)
		}
	}
}

// stores the value returned then
// spawns the user defined custom routine
// hopefully everything is designed smart enough
// that it doesn't matter what happens outside of here
// TODO: implement throttling someday
func (n *Node) gotUserEvent(a widget.Action) {
	defer func() {
		if r := recover(); r != nil {
			crash(r, "watchCallback()")
		}
	}()
	log.Log(CHANGE, "gotUserEvent() received event node =", n.id, n.progname, a.Value)

	if !n.IsEnabled() {
		log.Log(WARN, "ignoring plugin event for a disabled widget", n.id, n.progname, a.Value)
		log.Log(WARN, "this can't be fixed until switching go.wit.com/gui to protobuf")
		return
	}

	if ok, pb, w := n.isWidgetInTable(a.WidgetId); ok {
		// log.Log(WARN, "gui.gotUserEvent() action =", a)
		// log.Log(WARN, "gui.gotUserEvent() widget is in pb table", n.id, n.progname)
		if w == nil {
			log.Log(WARN, "gui.gotUserEvent() widget == nil", n.id, n.progname)
			return
		}
		log.Log(WARN, "gui.gotUserEvent() found widget in pb table", pb.GetUuid(), w)
		pb.Custom(w)
		return
	} else {
		log.Log(INFO, "gui.gotUserEvent() widget is not in pb table", n.id, n.progname)
	}

	switch n.WidgetType {
	case widget.Dropdown:
		// n.checked = a.State.Checked // TODO: do this and/or time to switch to protobuf
		n.currentS = a.State.CurrentS
	case widget.Combobox:
		// n.checked = a.State.Checked // TODO: do this and/or time to switch to protobuf
		n.currentS = a.State.CurrentS
	case widget.Checkbox:
		// n.checked = a.State.Checked // TODO: do this and/or time to switch to protobuf
		n.checked = a.State.Checked
	default:
	}

	n.currentS = a.State.CurrentS
	log.Log(CHANGE, "gotUserEvent() n.Bool() =", n.Bool(), "n.String() =", n.String())
	if n.Custom == nil {
		log.Log(CHANGE, "a Custom() function was not set for this widget")
		return
	}
	go something(n)
}

func something(n *Node) {
	defer func() {
		if r := recover(); r != nil {
			crash(r, "watchCallback()")
		}
	}()
	n.Custom()
}

// There should only be one of these per application
// This is due to restrictions by being cross platform
// some toolkit's on some operating systems don't support more than one
// Keep things simple. Do the default expected thing whenever possible
func New() *Node {
	/*
		if argGui.GuiStdout {
			log.Log(WARN, "--gui-stdout doesn't work yet")
			// trapStdout()
		}
	*/
	if argGui.GuiPluginHack != "" {
		// does os.Exec() and does not return
		testPluginAndExit()
	}

	if argGui.GuiVerbose {
		INFO.SetBool(true)
	}

	initNew()
	return me.rootNode
}

func NoGui() bool {
	return argGui.NoGui
}

// try to load andlabs, if that doesn't work, fall back to the console
func (n *Node) Default() *Node {
	var err error
	// used to check if plugins load or not
	if argGui.GuiPluginHack != "" {
		// does os.Exec() and does not return
		testPluginAndExit()
		os.Exit(0)
	}

	if argGui.NoGui {
		log.Log(WARN, "--no-gui chill Winston. I don't need no gui")
		return n
	}
	if argGui.GuiPlugin != "" {
		log.Log(WARN, "New.Default() try toolkit =", argGui.GuiPlugin)
		if n, err = n.LoadToolkit(argGui.GuiPlugin); err == nil {
			return n
		}
		log.Log(WARN, "LoadToolkit() failed for =", argGui.GuiPlugin)
		return nil
	}
	if me.appPlugin != "" {
		if n, err = n.LoadToolkit(me.appPlugin); err == nil {
			return n
		}
	}

	// if DISPLAY isn't set, return since gtk can't load
	// TODO: figure out how to check what to do in macos and mswindows
	if os.Getenv("DISPLAY") == "" {
		log.Log(WARN, "gui.Default() DISPLAY not set")
		log.Log(WARN, "gui.Default() attempting ncurses gui")
		if n, err = n.LoadToolkit("gocui"); err == nil {
			return n
		}
		return nil
	}
	if n, err = n.LoadToolkit("andlabs"); err == nil {
		return n
	}
	log.Log(WARN, "LoadToolkit() failed to load andlabs")

	if n, err = n.LoadToolkit("gocui"); err == nil {
		return n
	}
	log.Log(WARN, "LoadToolkit() failed to load gocui")

	log.Log(WARN, "")
	log.Log(WARN, "### Error ####")
	log.Log(WARN, "The GUI golang plugins did not load.")
	log.Log(WARN, "You will have to rebuild them")
	log.Log(WARN, "go-clone go.wit.com/toolkits/<pick one>/")
	log.Log(WARN, "TODO: try to rebuild them here")
	log.Log(WARN, "TODO: falling back to STDIN interface")
	log.Log(WARN, "### Error ####")
	log.Log(WARN, "")
	log.Log(WARN, "sleep 2 seconds")
	log.Sleep(2)

	if n, err = n.LoadToolkit("nocui"); err == nil {
		return n
	}
	log.Log(WARN, "LoadToolkit() failed to load nocui")
	return n
}

// The window is destroyed but the application does not quit
func (n *Node) StandardClose() {
	log.Log(INFO, "wit/gui Standard Window Close. name =", n.progname)
	log.Log(INFO, "wit/gui Standard Window Close. n.Custom exit =", n.Custom)
}

// The window is destroyed and the application exits
// TODO: properly exit the plugin since Quit() doesn't do it
func StandardExit() {
	log.Log(INFO, "wit/gui Standard Window Exit. running os.Exit()")
	log.Log(INFO, "StandardExit() attempt to exit each toolkit plugin")
	for i, plug := range allPlugins {
		log.Log(INFO, "NewButton()", i, plug)
	}
	log.Exit(0)
}

// The window is destroyed and the application exits
// TODO: properly exit the plugin since Quit() doesn't do it
func (n *Node) StandardExit() {
	log.Log(INFO, "wit/gui Standard Window Exit. running os.Exit()")
	log.Log(INFO, "StandardExit() attempt to exit each toolkit plugin")
	for i, plug := range allPlugins {
		log.Log(INFO, "NewButton()", i, plug)
		n.CloseToolkit(plug.name)
	}
	log.Exit(0)
}

var origStdout *os.File
var origStderr *os.File
var guioutf *os.File
var guierrf *os.File

// THIS DOES NOT WORK.
// this needs to work like screen. somehow make pseudo tty's or something
// to correctly isolate and trap STDOUT and STDERR so the gocui can work
func trapStdout() {
	// attempts to control STDOUT
	var err error
	log.Log(WARN, "trapStdout() START")

	guioutf, err = os.OpenFile("/tmp/go-gui.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
	if err != nil {
		log.Error(err, "error opening /tmp/go-gui.log")
		os.Exit(0)
	}
	origStdout = os.Stdout
	os.Stdout = guioutf
	// defer guioutf.Close()

	// setOutput(outf)
	// log("This is a test log entry")

	guierrf, err = os.OpenFile("/tmp/go-gui.err", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0664)
	if err != nil {
		log.Error(err, "error opening /tmp/go-gui.err")
		os.Exit(0)
	}
	// defer guierrf.Close()
	origStderr = os.Stderr
	os.Stderr = guierrf

	// maybe all this should be deleted now?
	println("TEST println")
	println("TEST println")
	println("TEST println")
	// maybe test fmt? or, maybe all this should be deleted now?
	// fmt.Println("TEST fmt")
	// fmt.Println("TEST fmt")
	log.Info("TEST log")
	log.Info("TEST log")
	log.Info("TEST log")

	// defer guioutf.Close()
}

// sets the applications requested plugin
// the command line arguements override this
func (n *Node) SetAppDefaultPlugin(plugname string) {
	me.appPlugin = plugname
}