/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A basic `SKNode` based slider.

 */

import SpriteKit

class Slider: SKNode {

    var value: CGFloat = 0.0 {

        didSet {

            slider!.position = CGPoint(x: CGFloat(background!.position.x + value * width ), y: CGFloat(0.0))

        }

    }

    var label: SKLabelNode?

    var slider: SKShapeNode?

    var background: SKSpriteNode?

    private(set) var actionClicked: Selector?

    private(set) var targetClicked: AnyObject?

    init(width: Int, height: Int, 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: 0.0, y: -8.0)

        // create background & slider

        background = SKSpriteNode(color: SKColor.white, size: CGSize(width: CGFloat(width), height: CGFloat(2)))

        slider = SKShapeNode(circleOfRadius: CGFloat( height ) )

        slider!.fillColor = SKColor.white

        background!.anchorPoint = CGPoint(x: CGFloat(0.0), y: CGFloat(0.5))

        slider!.position = CGPoint(x: CGFloat(label!.frame.size.width / 2.0 + 15), y: CGFloat(0.0))

        background!.position = CGPoint(x: CGFloat(label!.frame.size.width / 2.0 + 15), y: CGFloat(0.0))

        // add to the root node

        addChild(label!)

        addChild(background!)

        addChild(slider!)

        // track mouse event

        isUserInteractionEnabled = true

        value = 0.0

    }

    required init?(coder aDecoder: NSCoder) {

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

    }

    var width: CGFloat {

        return background!.frame.size.width

    }

    var height: CGFloat {

        return slider!.frame.size.height

    }

    func setBackgroundColor(_ col: SKColor) {

        background!.color = col

    }

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

        targetClicked = target

        actionClicked = action

    }

#if os( OSX )

    override func mouseDown(with event: NSEvent) {

        mouseDragged(with: event)

    }

    override func mouseUp(with event: NSEvent) {

        setBackgroundColor(SKColor.white)

    }

    override func mouseDragged(with event: NSEvent) {

        setBackgroundColor(SKColor.gray)

        let posInView = scene!.convert(position, from:parent!)

        let x = event.locationInWindow.x - posInView.x - background!.position.x

        let pos = fmax(fmin(x, width), 0.0)

        slider!.position = CGPoint(x: CGFloat(background!.position.x + pos), y: 0.0)

        value = pos / width

        _ = targetClicked?.perform(actionClicked, with: self)

    }

#endif

#if os( iOS )

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

        setBackgroundColor(SKColor.gray)

        let x = touches.first!.location(in: self).x - background!.position.x

        let pos = max(fmin(x, width), 0.0)

        slider!.position = CGPoint(x: CGFloat(background!.position.x + pos), y: CGFloat(0.0))

        value = pos / width

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

    }

#endif

}