package ru.dbotthepony.kstarbound.lua

import ru.dbotthepony.kstarbound.Starbound
import java.io.Closeable
import java.lang.ref.Cleaner.Cleanable

class LuaHandle(private val parent: LuaSharedState, val handle: Int, val key: Any?) : Closeable {
	private val cleanable: Cleanable

	var isValid = true
		private set

	init {
		val parent = parent
		val handle = handle
		val key = key

		cleanable = Starbound.CLEANER.register(this) {
			parent.freeHandle(handle, key)
		}

	}

	fun push(into: LuaThread) {
		check(isValid) { "Tried to use NULL handle!" }
		parent.handlesThread.push()
		parent.handlesThread.copy(handle, -1)
		parent.handlesThread.moveStackValuesOnto(into)
	}

	override fun close() {
		if (!isValid) return
		cleanable.clean()
		isValid = false
	}
}