// A Director used by most of the scenes in the game.
// Note, the menu scene also uses this.
class Level : AbstractDirector {

    static var instance : Level = null

    // If the scene is won, the next scene to play.
    @Attribute
    var nextScene = "menu"

    // Initially zero, then incremented as aliens are created.
    // Incremented from method newAlien, and decrmented from alienDead.
    var aliensRemaining = 0

    var ended = false
    var endCountdown = 100

    var escape : Input

    init {
        instance = this
    }

    override fun activated() {
        escape = Game.instance.resources.inputs.find("escape")
    }

    override fun tick() {
        

        if (ended) {
            endCountdown --
            if (endCountdown <= 0) {
                Game.instance.startScene( nextScene )
            }
        }
    }

    fun newAlien() {
        aliensRemaining ++
    }

    fun alienDied() {
        aliensRemaining --
        if (aliensRemaining <= 0) {
            DrunkInvaders.instance.unlockScene( nextScene )
            ended = true
        }
    }

    override fun onKey( event : KeyEvent ) {
        if ( escape.isPressed() ) {
            if ( Game.instance.sceneName == "menu" ) {
                Game.instance.quit()
            } else {
                Game.instance.startScene( "menu" )
            }
        }
    }

}