package net.shadowfacts.cacao.viewcontroller

import net.shadowfacts.cacao.Window
import net.shadowfacts.cacao.util.properties.ObservableLazyProperty
import net.shadowfacts.cacao.view.View
import net.shadowfacts.kiwidsl.dsl
import java.util.*

/**
 * @author shadowfacts
 */
abstract class ViewController {

	lateinit var window: Window

	val createConstraints
		get() = window.solver::dsl

	lateinit var view: View
		protected set

	var parent: ViewController? = null
		set(value) {
			willMoveTo(value)
			field = value
			didMoveTo(value)
		}

	private var _children = LinkedList<ViewController>()
	val children: List<ViewController> = _children

	abstract fun loadView()

	open fun viewDidLoad() {}

	open fun viewWillLayoutSubviews() {
		children.forEach(ViewController::viewWillLayoutSubviews)
	}

	open fun viewDidLayoutSubviews() {
		children.forEach(ViewController::viewDidLayoutSubviews)
	}

	open fun viewWillAppear() {
		children.forEach(ViewController::viewWillAppear)
	}

	open fun viewDidAppear() {
		children.forEach(ViewController::viewDidAppear)
	}

	open fun viewWillDisappear() {
		children.forEach(ViewController::viewWillDisappear)
	}

	open fun viewDidDisappear() {
		children.forEach(ViewController::viewDidDisappear)
	}

	open fun willMoveTo(parent: ViewController?) {}

	open fun didMoveTo(parent: ViewController?) {}

	fun embedChild(viewController: ViewController, container: View = this.view) {
		viewController.parent = this
		viewController.window = window
		_children.add(viewController)
		viewController.loadView()

		container.addSubview(viewController.view)
		createConstraints {
			viewController.view.leftAnchor equalTo container.leftAnchor
			viewController.view.rightAnchor equalTo container.rightAnchor
			viewController.view.topAnchor equalTo container.topAnchor
			viewController.view.bottomAnchor equalTo container.bottomAnchor
		}

		viewController.viewDidLoad()
	}

	fun removeChild(viewController: ViewController) {
		viewController.parent = null
		_children.remove(viewController)
	}

	fun removeFromParent() {
		parent?.removeChild(this)
		// todo: remove view from superview
	}

}