package net.shadowfacts.cacao

import net.shadowfacts.cacao.util.LayoutGuide
import net.shadowfacts.cacao.view.View
import no.birkett.kiwi.Variable

/**
 * A Kiwi variable that belongs to a Cacao view.
 * This class generally isn't used directly, but via the anchor *Anchor properties on [View].
 *
 * @author shadowfacts
 */
class LayoutVariable(
	val view: View?,
	val layoutGuide: LayoutGuide?,
	val property: String,
): Variable("LayoutVariable") {

	constructor(view: View, property: String): this(view, null, property)
	constructor(layoutGuide: LayoutGuide, property: String): this(null, layoutGuide, property)

	init {
		if ((view == null) == (layoutGuide == null)) {
			throw RuntimeException("LayoutVariable must be constructed with either a view or layout guide")
		}
	}

	override fun getName() = "${view ?: layoutGuide}.$property"

	override fun toString() = "LayoutVariable(name=$name, value=$value)"

}