package net.shadowfacts.asmr.ui.block

import net.minecraft.util.Identifier
import net.shadowfacts.asmr.ASMR
import net.shadowfacts.asmr.program.execution.IncomingExecutionFlow
import net.shadowfacts.asmr.program.execution.OutgoingExecutionFlow
import net.shadowfacts.cacao.util.texture.Texture
import net.shadowfacts.cacao.view.TextureView
import net.shadowfacts.cacao.view.View
import net.shadowfacts.kiwidsl.dsl
import java.lang.RuntimeException

/**
 * @author shadowfacts
 */
class ProgramBlockExecutionView(val incoming: IncomingExecutionFlow?, val outgoing: OutgoingExecutionFlow?): View() {

	companion object {
		val emptyConnection = Texture(Identifier(ASMR.modid, "textures/gui/programmer/program_connections.png"), u = 0, v = 0)
		val executionConnection = Texture(Identifier(ASMR.modid, "textures/gui/programmer/program_connections.png"), u = 7, v = 0)
	}

	lateinit var textureView: TextureView

	constructor(incoming: IncomingExecutionFlow?): this(incoming, null)
	constructor(outgoing: OutgoingExecutionFlow?): this(null, outgoing)

	init {
		if (incoming == null && outgoing == null) {
			throw RuntimeException("One of incoming or outgoing must be non-null")
		}
	}

	override fun wasAdded() {
		super.wasAdded()

		textureView = addSubview(TextureView(emptyConnection))
		updateTexture()

		solver.dsl {
			textureView.leftAnchor equalTo leftAnchor
			textureView.rightAnchor equalTo rightAnchor
			textureView.topAnchor equalTo topAnchor
			textureView.bottomAnchor equalTo bottomAnchor
		}
	}

	fun updateTexture() {
		val active = if (incoming != null) incoming.source != null else outgoing!!.destination != null
		textureView.texture = if (active) executionConnection else emptyConnection
	}

}