/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Support class for action buttons.

 */

import SpriteKit

protocol ButtonOverlayDelegate: NSObjectProtocol {

    func willPress(_ button: ButtonOverlay)

    func didPress(_ button: ButtonOverlay)

}

class ButtonOverlay: SKNode {

    // Default 25, 25

    var size = CGSize.zero {

        didSet {

            if size != oldValue {

                updateForSizeChange()

            }

        }

    }

    weak var delegate: ButtonOverlayDelegate?

    private var trackingTouch: UITouch?

    private var inner: SKShapeNode!

    private var background: SKShapeNode!

    private var label: SKLabelNode?

    init(_ text: NSString) {

        super.init()

        size = CGSize(width: CGFloat(40), height: CGFloat(40))

        alpha = 0.7

        isUserInteractionEnabled = true

        buildPad(text)

    }

    required init?(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }

    func buildPad(_ text: NSString) {

        let backgroundRect = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(size.width), height: CGFloat(size.height))

        background = SKShapeNode()

        background.path = CGPath( ellipseIn: backgroundRect, transform: nil)

        background.strokeColor = SKColor.black

        background.lineWidth = 3.0

        addChild(background)

        inner = SKShapeNode()

        inner.path = CGPath( ellipseIn: CGRect( x: 0, y: 0, width: innerSize.width, height: innerSize.height ), transform: nil)

        inner.lineWidth = 1.0

        inner.fillColor = SKColor.white

        inner.strokeColor = SKColor.gray

        addChild(inner)

        label = SKLabelNode()

        label!.fontName = UIFont.boldSystemFont(ofSize: 24).fontName

        label!.fontSize = 24

        label!.fontColor = SKColor.black

        label?.verticalAlignmentMode = .center

        label?.horizontalAlignmentMode = .center

        label?.position = CGPoint(x: size.width / 2.0, y: size.height / 2.0 + 1.0)

        label?.text = text as String

        addChild(label!)

    }

    func updateForSizeChange() {

        guard let background = background  else { return }

        let backgroundRect = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(size.width), height: CGFloat(size.height))

        background.path = CGPath(ellipseIn: backgroundRect, transform: nil)

        let innerRect = CGRect(x: CGFloat(0), y: CGFloat(0), width: CGFloat(size.width / 3.0), height: CGFloat(size.height / 3.0))

        inner.path = CGPath(ellipseIn: innerRect, transform: nil)

        label!.position = CGPoint(x: size.width / 2.0 - label!.frame.size.width / 2.0, y: size.height / 2.0 - label!.frame.size.height / 2.0)

    }

    var innerSize: CGSize {

        return CGSize(width: CGFloat(size.width), height: CGFloat(size.height))

    }

    func resetInteraction() {

        trackingTouch = nil

        inner.fillColor = SKColor.white

        delegate!.didPress(self)

    }

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

        trackingTouch = touches.first

        inner.fillColor = SKColor.black

        delegate!.willPress(self)

    }

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

        if touches.contains(trackingTouch!) {

            resetInteraction()

        }

    }

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

        if touches.contains(trackingTouch!) {

            resetInteraction()

        }

    }

}