//+build !darwin

package main

import (
	"time"

        "github.com/xlab/android-go/android"
        "github.com/xlab/android-go/app"
	gl "github.com/xlab/android-go/gles31"

	//"github.com/golang-ui/nuklear/nk"
	"gitlab.wow.st/gmp/nuklear/nk"
)

const (
	datadir = "/storage/emulated/0/Android/data/st.wow.gitlab.gmp.commute/"
	fontSize = 64
)

func platformInit() {
	gl.Enable(gl.CULL_FACE)
	gl.Disable(gl.DEPTH_TEST)
	app.SetLogTag("Commute")
}

func mkWin() {
}

func Terminate() {
	return
}

func PollEvents() {
	return
}

func GetSize() (width, height int) {
	handle := nk.NkPlatformDisplayHandle()
	return handle.Width, handle.Height
}

func SwapBuffers() {
}

var (
	nativeWindowEvents chan app.NativeWindowEvent
	inputQueueEvents chan app.InputQueueEvent
	inputQueueChan chan *android.InputQueue
	backPressed bool
)

func eventloop() {
	nativeWindowEvents = make(chan app.NativeWindowEvent, 1)
	inputQueueEvents = make(chan app.InputQueueEvent, 1)
	inputQueueChan = make(chan *android.InputQueue, 1)

	app.Main(appmain)
	log(Info,"app.Main returned")
}

func appmain(a app.NativeActivity) {
	log(Info,"appmain() start")
	fpsTicker := time.NewTicker(frametime)
	a.HandleNativeWindowEvents(nativeWindowEvents)
	a.HandleInputQueueEvents(inputQueueEvents)
	log(Info,"appmain() launching init thread")
	inputs := make(chan struct{},64)
	go app.HandleInputQueues(inputQueueChan, func() {
			a.InputQueueHandled()
		}, func(ev *android.InputEvent) {
			switch android.InputEventGetType(ev) {
			case android.InputEventTypeKey:
				key := android.KeyEventGetKeyCode(ev)
				action := android.KeyEventGetAction(ev)
				meta := android.KeyEventGetMetaState(ev)
				switch action {
				case android.KeyEventActionDown:
					if key == android.KeycodeBack {
						backPressed = true
						inputs<- struct{}{}
						return
					}
					fallthrough
				case android.KeyEventActionUp:
					nk.NkPlatformInput(nil, &nk.PlatformKeyEvent{
						Activity:  a.NativeActivity(),
						Action:    action,
						KeyCode:   key,
						MetaState: meta,
					})
					inputs<- struct{}{}
				}
			case android.InputEventTypeMotion:
				action := android.MotionEventGetAction(ev)
				switch action {
				case android.MotionEventActionDown,
					android.MotionEventActionMove,
					android.MotionEventActionUp:
					x := android.MotionEventGetX(ev, 0)
					y := android.MotionEventGetY(ev, 0)
					nk.NkPlatformInput(&nk.PlatformTouchEvent{
						Action: action,
						X:      int32(x),
						Y:      int32(y),
					}, nil)
					inputs<- struct{}{}
				}
			}
		})
	a.InitDone()
	log(Info,"appmain() starting event loop")
	for {
		select {
		case event := <-a.LifecycleEvents():
			log(Info,"appmain(): lifecycle ", event)
		case event := <-inputQueueEvents:
			log(Debug,"appmain(): inputQueueEvent ", event)
			switch event.Kind {
			case app.QueueCreated:
				inputQueueChan <- event.Queue
			case app.QueueDestroyed:
				inputQueueChan <- nil
			}
			if ctx != nil {
				gfxMain()
			}
		case <-fpsTicker.C:
			log(DebugGfx,"appmain(): fpsTicker")
			if ctx != nil {
				log(DebugGfx,"gfxMain()")
				fpsTicker.Stop()
				gfxMain()
				fpsTicker = newTicker()
			}
		case <-inputs:
			log(Debug,"appmain(): inputs queue")
			if ctx != nil {
				fpsTicker.Stop()
				gfxMain()
				fpsTicker = newFastTicker()
			}
		case event := <-nativeWindowEvents:
			log(Info,"appmain(): nativeWindowEvents", event)
			switch event.Kind {
			case app.NativeWindowRedrawNeeded:
				log(Info,"appmain(): redraw")
				fpsTicker.Stop()
				gfxMain()
				a.NativeWindowRedrawDone()
				fpsTicker = newTicker()
			case app.NativeWindowCreated:
				log(Info,"appmain(): window created")
				ctx = nk.NkPlatformInit(event.Window, nk.PlatformInstallCallbacks)
				log(Info,"appmain(): init returned")
				if ctx == nil {
					log(Fatal,"Nuklear failed to init")
				}
				loadFont()
				fpsTicker = newTicker()
				log(Info,"appmain(): done with create window")
			case app.NativeWindowDestroyed:
				log(Info,"appmain(): window destroyed")
				//refresh = true
				fpsTicker.Stop()
				nk.NkPlatformShutdown()
				Drain:
				for {
					select {
					case <-inputs:
					default:
						break Drain
					}
				}
			}
		}
		backPressed = false
	}
	log(Info,"appmain: returning")
}

func newFastTicker() *time.Ticker {
	return time.NewTicker(time.Second / 60)
}

func newTicker() *time.Ticker {
	if y != lastY {
		return time.NewTicker(time.Second / 60)
	} else {
		return time.NewTicker(time.Second)
	}
}

func BackButton(string) bool {
	return backPressed
}

func Clip(x string) {

}