//
//  ViewController.swift
//  EllipseWreath
//
//  Created by MizushimaYusuke on 2016/12/10.
//  Copyright © 2016 MizushimaYusuke. All rights reserved.
//

import UIKit
import GameplayKit
import SpriteKit

class ViewController: UIViewController {

    weak var scene: SKScene?

    override func viewDidLoad() {
        super.viewDidLoad()
        setupScene()
        createEllipse()
    }

    func setupScene() {
        let sv = SKView(frame: view.bounds)
        let s = SKScene(size: sv.frame.size)
        s.backgroundColor = UIColor(hue: 0.6, saturation: 0.1, brightness: 0.1, alpha: 1)
        sv.presentScene(s)
        view.addSubview(sv)
        scene = s
    }

    func createEllipse() {
        let n = 40
        let dw = CGFloat(M_PI) / CGFloat(n)
        for i in 0...n {
            let el = SKShapeNode(ellipseIn: CGRect(x: -60, y: -20, width: 120, height: 40))
            el.position = CGPoint(x: view.frame.midX, y: view.frame.midY)
            el.fillColor = UIColor.clear
            let isRed = arc4random_uniform(8) == 0
            el.strokeColor = isRed ? UIColor.red : UIColor.green
            scene?.addChild(el)
            el.zRotation = CGFloat(i) * dw
        }
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let n = 40
        let dw = CGFloat(M_PI) / CGFloat(n)

        GKRandomSource.sharedRandom().arrayByShufflingObjects(in: scene!.children)
            .enumerated()
            .forEach { (i, n) in
                (n as! SKNode).run(
                    SKAction.sequence([
                        SKAction.rotate(toAngle: CGFloat(M_PI) * 2.0, duration: 1.0),
                        SKAction.rotate(toAngle: CGFloat(i) * dw, duration: 1.0)
                ]))
        }
    }

}