Eden's dialogue extension

Dialogue.kt

package modules.dialogue

import ps.eden.server.game.content.dialogue.DialoguePlugin
import ps.eden.server.game.node.entity.player.Player
import kotlin.reflect.KVisibility

/**
 * @author Jire
 */
abstract class Dialogue(vararg val applicableIDs: Int) : DialoguePlugin() {
	
	val stages = Stages(this)
	
	override fun newInstance(player: Player?) = this::class.constructors.firstOrNull {
		it.visibility == KVisibility.PUBLIC && it.parameters.isEmpty()
	}?.run {
		call().apply {
			this.player = player
			if (player != null) interpreter = player.dialogueInterpreter
			
			stages.define()
		}
	}
	
	override fun open(vararg args: Any?): Boolean {
		stage = Stages.START_STAGE
		return handle(-1, -1)
	}
	
	override fun handle(interfaceId: Int, buttonId: Int): Boolean {
		val stage = stages.stageFor(this.stage)
		
		if (stage == null || this.stage == Stages.END_STAGE) end()
		else {
			stage.interfaceID = interfaceId
			stage.buttonID = buttonId
			this.stage = stage.next()
		}
		
		return true
	}
	
	abstract fun Stages.define()
	
	override fun getIds() = applicableIDs
	
}