/*

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

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A state used to represent the player when hit by a `TaskBot` attack.

*/

import SpriteKit

import GameplayKit

class PlayerBotHitState: GKState {

    // MARK: Properties

    unowned var entity: PlayerBot

    /// The amount of time the `PlayerBot` has been in the "hit" state.

    var elapsedTime: TimeInterval = 0.0

    /// The `AnimationComponent` associated with the `entity`.

    var animationComponent: AnimationComponent {

        guard let animationComponent = entity.component(ofType: AnimationComponent.self) else { fatalError("A PlayerBotHitState's entity must have an AnimationComponent.") }

        return animationComponent

    }

    // MARK: Initializers

    required init(entity: PlayerBot) {

        self.entity = entity

    }

    // MARK: GKState Life Cycle

    override func didEnter(from previousState: GKState?) {

        super.didEnter(from: previousState)

        // Reset the elapsed "hit" duration on entering this state.

        elapsedTime = 0.0

        // Request the "hit" animation for this `PlayerBot`.

        animationComponent.requestedAnimationState = .hit

    }

    override func update(deltaTime seconds: TimeInterval) {

        super.update(deltaTime: seconds)

        // Update the amount of time the `PlayerBot` has been in the "hit" state.

        elapsedTime += seconds

        // When the `PlayerBot` has been in this state for long enough, transition to the appropriate next state.

        if elapsedTime >= GameplayConfiguration.PlayerBot.hitStateDuration {

            if entity.isPoweredDown {

                stateMachine?.enter(PlayerBotRechargingState.self)

            }

            else {

                stateMachine?.enter(PlayerBotPlayerControlledState.self)

            }

        }

    }

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

        switch stateClass {

            case is PlayerBotPlayerControlledState.Type, is PlayerBotRechargingState.Type:

                return true

            default:

                return false

        }

    }

}