/*

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

     See LICENSE.txt for this sample’s licensing information

     Abstract:

     This is the SpriteKit scene that renders the game scene. It allows users to perform multitouch actions and renders colorful feedback.

*/

import SpriteKit

import GameplayKit

class GameScene: SKScene {

    // MARK: Properties

    var entities = [GKEntity]()

    var graphs = [GKGraph]()

    private var lastUpdateTime: TimeInterval = 0

    private var label: SKLabelNode!

    private var spinnyNode: SKShapeNode!

    // MARK: SKScene

    override func sceneDidLoad() {

        lastUpdateTime = 0

        label = childNode(withName: "//helloLabel") as! SKLabelNode

        label.alpha = 0.0

        label.run(.fadeIn(withDuration: 2.0))

        let w = (size.width + size.height) * 0.05

        spinnyNode = SKShapeNode(rectOf: CGSize(width: w, height: w), cornerRadius: w * 0.3)

        if let spinnyNode = spinnyNode {

            spinnyNode.lineWidth = 2.5

            spinnyNode.run(.repeatForever(.rotate(byAngle: CGFloat(M_PI), duration: 1)))

            spinnyNode.run(.sequence([.wait(forDuration: 0.5),

                                      .fadeOut(withDuration: 0.5),

                                      .removeFromParent()]))

        }

    }

    override func update(_ currentTime: TimeInterval) {

        if lastUpdateTime == 0 {

            lastUpdateTime = currentTime

        }

        let dt = currentTime - lastUpdateTime

        for entity in entities {

            entity.update(deltaTime: dt)

        }

        lastUpdateTime = currentTime

    }

    // MARK: UIResponder

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

        label.run(SKAction(named: "Pulse")!, withKey: "fadeInOut")

        for touch in touches {

            touchDown(atPoint: touch.location(in: self))

        }

    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

        for touch in touches {

            touchUp(atPoint: touch.location(in: self))

        }

    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

        for touch in touches {

            touchMoved(toPoint: touch.location(in: self))

        }

    }

    override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {

        for touch in touches {

            touchUp(atPoint: touch.location(in: self))

        }

    }

    // MARK: Touch handling helpers

    private func touchDown(atPoint pos: CGPoint) {

        let node = spinnyNode.copy() as! SKShapeNode

        node.position = pos

        node.strokeColor = .green

        addChild(node)

    }

    private func touchMoved(toPoint pos: CGPoint) {

        let node = spinnyNode.copy() as! SKShapeNode

        node.position = pos

        node.strokeColor = .blue

        addChild(node)

    }

    private func touchUp(atPoint pos: CGPoint) {

        let node = spinnyNode.copy() as! SKShapeNode

        node.position = pos

        node.strokeColor = .red

        addChild(node)

    }

}