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typealias SnackFinishedListener = () -> Unit
typealias SnackActionListener = () -> Unit

/**
 * Representation of [Snackbar] data that can be exposed by a view model, observed, and bound to
 * the current UI
 */
sealed class SnackData

/**

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/**
 * Representation of [Toast] data that can be exposed by a view model, observed, and bound to
 * the current UI
 */
sealed class ToastData

data class ShortToast(@StringRes val msgId:Int) : ToastData()
data class LongToast(@StringRes val msgId:Int) : ToastData()

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viewModel.toastPub.subscribe { toastData ->
    when(toastData) {
        is ShortToast -> Toast.makeText(this, toastData.msgId, Toast.LENGTH_SHORT).show()
        is LongToast -> Toast.makeText(this, toastData.msgId, Toast.LENGTH_LONG).show()
    }
}

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val toastPub:PublishSubject<ToastData> = PublishSubject.create()

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val snackPub:PublishSubject<SnackData> = PublishSubject.create()

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fun bindViewModel(root:View, viewModel: BaseViewModel) {
  viewModel.snackPub.subscribe { snackData ->
    showSnackbar(rootView, snackData)
  }
}

/**
 * Maps the passed [SnackData] to the appropriate UI representation of a [Snackbar]
 */
private fun showSnackbar(root: View, data: SnackData) {

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// Lifecycle States
sealed class ViewModelLifecycleState

object Active : ViewModelLifecycleState()

object FinishedOk : ViewModelLifecycleState()

object Cancelled : ViewModelLifecycleState()

data class FinishedWithResult(

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viewModel.lifecycleStatePub.subscribe { state ->
    when (state) {
        is Active -> {}
        is FinishedOk, Cancelled -> finish()
        is FinishedWithResult -> {
            setResult(state.result, state.data)
            finish()
        }
        is StartActivity -> {
            val intent = Intent(this, state.target).apply {

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// Indicate the the screen should be closed
class ImageViewModel() : BaseViewModel() {

    @BoundMethod
    fun onExitFullscreenClicked() {
        lifecycleState.set(FinishedOk)
    }
}

// indicate that the screen should be finished and a result is returned

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class MainActivity : Activity() {

    private val TAG = MainActivity::class.java.simpleName

    private val blinkHandler = Handler()
    private var redLED: Gpio? = null

    private val blinkRunnable = object : Runnable {
        override fun run() {
            redLED?.also {