/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A state used by `SceneLoader` to indicate that the downloading of on demand resources failed.

*/

import GameplayKit

class SceneLoaderDownloadFailedState: GKState {

    // MARK: Properties

    unowned let sceneLoader: SceneLoader

    // MARK: Initialization

    init(sceneLoader: SceneLoader) {

        self.sceneLoader = sceneLoader

    }

    // MARK: GKState Life Cycle

    override func didEnter(from previousState: GKState?) {

        super.didEnter(from: previousState)

        // Clear the `sceneLoader`'s progress.

        sceneLoader.progress = nil

        // Notify any interested objects that the download has failed.

        NotificationCenter.default.post(name: NSNotification.Name.SceneLoaderDidFailNotification, object: sceneLoader)

    }

    override func isValidNextState(_ stateClass: AnyClass) -> Bool {

        return stateClass is SceneLoaderDownloadingResourcesState.Type

    }

}