package gui

import (
	"os"

	"go.wit.com/log"
	"go.wit.com/widget"
)

// TODO: make a fake 'plugin' channel of communication to andlabs for mswindows
// Windows doesn't support plugins. How can I keep andlabs and only compile it on windows?
// https://forum.heroiclabs.com/t/setting-up-goland-to-compile-plugins-on-windows/594/5
// import toolkit "go.wit.com/gui/toolkit/andlabs"

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

func init() {
	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

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

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

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

// 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 watchCallback() {
	log.Log(INFO, "guiChan() START")
	for {
		log.Log(CHANGE, "guiChan() select restarted")
		select {
		case a := <-me.guiChan:
			// 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.ToolkitPanic {
				log.Log(WARN, "guiChan() Toolkit panic() in", a.ProgName)
				log.Log(WARN, "guiChan() unload toolkit plugin here", a.ProgName)
				me.rootNode.ListToolkits()
				for _, aplug := range allPlugins {
					log.Log(WARN, "ListToolkits() already loaded toolkit plugin =", aplug.name)
					if aplug.name == a.ProgName {
						log.Log(WARN, "FOUND PLUGIN =", aplug.name)
						log.Log(WARN, "unload here")
						log.Log(WARN, "panic on purpose")
						me.rootNode.CloseToolkit(aplug.name)
						// panic("panic trapped!")
						// log.Sleep(.5)
						// me.rootNode.LoadToolkit("gocui")
						break
					}
				}
				log.UnsetTmp()
				// StandardExit()
				me.rootNode.LoadToolkit("nocui")
				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() 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) {
	log.Log(CHANGE, "gotUserEvent() received event node =", n.id, n.progname, a.Value)

	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 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 {
	return me.rootNode
}

// try to load andlabs, if that doesn't work, fall back to the console
func (n *Node) Default() *Node {
	if argGui.GuiPlugin != "" {
		log.Log(WARN, "New.Default() try toolkit =", argGui.GuiPlugin)
		return n.LoadToolkit(argGui.GuiPlugin)
	}
	// 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") == "" {
		if n.LoadToolkit("gocui") == nil {
			log.Log(WARN, "New() failed to load gocui")
		}
		return n
	}
	if n.LoadToolkit("andlabs") != nil {
		return n
	}
	n.LoadToolkit("gocui")
	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)
	}
	log.Exit(0)
}