package coreobjects

type SceneManager struct {
	OverlayScene Scene
	SelectedScene Scene
}

type Scene interface {
	Create(SceneManager)
	Destroy()
	Update()
	Draw()
}

func InitSceneManager() SceneManager {
	return SceneManager{
		OverlayScene: &OveralyScene{},
		SelectedScene: nil,
	}
}

func (base *SceneManager) ChangeScene(newScene Scene) {
	if base.SelectedScene != nil {
		base.SelectedScene.Destroy()
	}
	base.SelectedScene = newScene
	base.SelectedScene.Create(*base)
}

func (base *SceneManager) Update() {
	if (base.SelectedScene != nil) {
		base.SelectedScene.Update()
	}

	if (base.OverlayScene != nil) {
		base.OverlayScene.Update()
	}
}

func (base *SceneManager) Draw() {
	if (base.SelectedScene != nil) {
		base.SelectedScene.Draw()
	}

	if (base.OverlayScene != nil) {
		base.OverlayScene.Draw()
	}
}