/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A basic `SKNode` based button.

 */

import SpriteKit

class Button: SKNode {

    var width: CGFloat {

        return size.width

    }

    var label: SKLabelNode?

    var background: SKSpriteNode?

    private(set) var actionClicked: Selector?

    private(set) var targetClicked: Any?

    var size = CGSize.zero

    func setText(_ txt: String) {

        label!.text = txt

    }

    func setBackgroundColor(_ col: SKColor) {

        guard let background = background else { return }

        background.color = col

    }

    func setClickedTarget(_ target: Any, action: Selector) {

        targetClicked = target

        actionClicked = action

    }

    init(text txt: String) {

        super.init()

        // create a label

        let fontName: String = "Optima-ExtraBlack"

        label = SKLabelNode(fontNamed: fontName)

        label!.text = txt

        label!.fontSize = 18

        label!.fontColor = SKColor.white

        label!.position = CGPoint(x: CGFloat(0.0), y: CGFloat(-8.0))

        // create the background

        size = CGSize(width: CGFloat(label!.frame.size.width + 10.0), height: CGFloat(30.0))

        background = SKSpriteNode(color: SKColor(red: CGFloat(0), green: CGFloat(0), blue: CGFloat(0), alpha: CGFloat(0.75)), size: size)

        // add to the root node

        addChild(background!)

        addChild(label!)

        // Track mouse event

        isUserInteractionEnabled = true

    }

    init(skNode node: SKNode) {

        super.init()

        // Track mouse event

        isUserInteractionEnabled = true

        size = node.frame.size

        addChild(node)

    }

    required init?(coder aDecoder: NSCoder) {

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

    }

    func height() -> CGFloat {

        return size.height

    }

#if os( OSX )

    override func mouseDown(with event: NSEvent) {

        setBackgroundColor(SKColor(red: CGFloat(0), green: CGFloat(0), blue: CGFloat(0), alpha: CGFloat(1.0)))

    }

    override func mouseUp(with event: NSEvent) {

        setBackgroundColor(SKColor(red: CGFloat(0), green: CGFloat(0), blue: CGFloat(0), alpha: CGFloat(0.75)))

        let x = position.x + ((parent?.position.x) ?? CGFloat(0))

        let y = position.y + ((parent?.position.y) ?? CGFloat(0))

        let p = event.locationInWindow

        if fabs(p.x - x) < width / 2 * xScale && fabs(p.y - y) < height() / 2 * yScale {

            _ = (targetClicked! as AnyObject).perform(actionClicked, with: self)

        }

    }

#endif

#if os( iOS )

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

        _ = (targetClicked! as AnyObject).perform(actionClicked, with: self)

    }

#endif

}