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sealed class Option<out A> {

    abstract fun get(): A

    object None : Option<Nothing>() {
        override fun get(): Nothing = throw NoSuchElementException("None.get")
    }

    data class Some<out A>(val value: A) : Option<A>() {
        override fun get(): A = value

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data class Sms(val phone: String, val text: String)

object SmsBus {
    private val bus by lazy { PublishSubject.create<Sms>() }

    fun incomingSms(): Observable<Sms> = bus
    fun postSms(sms: Sms) = bus.onNext(sms)
}

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interface MySimpleAdapter<in T> {
    fun setNewData(data: List<T>)
}

inline fun <T> simpleAdapter(
        itemLayout: Int,
        crossinline getId: (T) -> Long,
        crossinline bind: (holder: RecyclerView.ViewHolder, item: T) -> Unit,
        crossinline onItemClick: (T) -> Unit)
        : RecyclerView.Adapter<RecyclerView.ViewHolder>

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fun EditText.toObservable(): Observable<String> {
    return Observable.create({
        val watcher = object : TextWatcher {

            override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
                scream("aaa" + p0.toString())
                it.onNext(p0.toString())
            }

            override fun afterTextChanged(p0: Editable?) { }

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fun TextView.onTextChanged(block: (String) -> Unit) {
    addTextChangedListener(object : TextWatcher {
        override fun afterTextChanged(s: Editable?) {}
        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
            block(s.toString())
        }
    })
}

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fun Context.makePhoneCall(number: String) : Boolean {
    try {
        val intent = Intent(Intent.ACTION_DIAL, Uri.parse("tel:$number"))
        startActivity(intent)
        return true
    } catch (e: Exception) {
        e.printStackTrace()
        return false
    }
}

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fun RecyclerView.onScrollToEnd(linearLayoutManager: LinearLayoutManager, onScrollNearEnd: (Unit) -> Unit)
        = addOnScrollListener(object : RecyclerView.OnScrollListener() {
    override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
        if (linearLayoutManager.childCount + linearLayoutManager.findFirstVisibleItemPosition()
                >= linearLayoutManager.itemCount - 5) {  //if near fifth item from end
            onScrollNearEnd(Unit)
        }
    }
})

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fun Int.dp2px(context: Context): Int = (this * context.resources.displayMetrics.density).toInt()

fun Int.px2dp(context: Context): Int = (this / context.resources.displayMetrics.density).toInt()

fun Float.dp2px(context: Context): Float = this * context.resources.displayMetrics.density

fun Float.px2dp(context: Context): Float = this / context.resources.displayMetrics.density

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fun String.toEditable(): Editable = Editable.Factory.getInstance().newEditable(this)

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private fun getFileName(context: Context, uri: Uri): String {

    if (uri.scheme == "content") {
        val cursor = context.contentResolver.query(uri, null, null, null, null)
        cursor.use {
            if(cursor.moveToFirst()) {
                return cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME))
            }
        }
    }