//
//  LoaderCircleStrokeAnimation.swift
//  LoaderButton
//
//  Created by 黄进文 on 2018/6/11.
//  Copyright © 2018年 Jovins. All rights reserved.
//

import UIKit

class LoaderCircleChaseAnimation: LoaderButtonAnimationDelegate {

    /// Setup Loader Layer
    ///
    /// - Parameters:
    /// - layer: layer Parent layer (Button layer)
    /// - frame: frame of parant layer
    /// - color: color of Loader
    func setupLoaderButtonAnimation(layer: CALayer, frame: CGRect, color: UIColor) {

        let padding: CGFloat = 10.0
        let sizeValue = max(min(frame.width, frame.height) - padding, 1.0)

        let beginTime: Double = 0.5
        let strokeStartDuration: Double = 1.2
        let strokeEndDuration: Double = 0.7

        /// Animation
        let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation")
        rotationAnimation.byValue = Float.pi * 2
        rotationAnimation.timingFunction = CAMediaTimingFunction(name: .linear)

        let strokeEndAnimation = CABasicAnimation(keyPath: "strokeEnd")
        strokeEndAnimation.duration = strokeEndDuration
        strokeEndAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.4, 0.0, 0.2, 1.0)
        strokeEndAnimation.fromValue = 0
        strokeEndAnimation.toValue = 1

        let strokeStartAnimation = CABasicAnimation(keyPath: "strokeStart")
        strokeStartAnimation.duration = strokeStartDuration
        strokeStartAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.4, 0.2, 0.0, 1.0)
        strokeStartAnimation.fromValue = 0
        strokeStartAnimation.toValue = 1
        strokeStartAnimation.beginTime = beginTime

        let groupAnimation = CAAnimationGroup()
        groupAnimation.animations = [rotationAnimation, strokeEndAnimation, strokeStartAnimation]
        groupAnimation.duration = strokeStartDuration + beginTime
        groupAnimation.repeatCount = .infinity
        groupAnimation.isRemovedOnCompletion = false
        groupAnimation.fillMode = .forwards

        let circle = LoaderShape.stroke.layer(with: CGSize(width: sizeValue, height: sizeValue), color: color)
        let frame = CGRect(x: padding * 0.5, y: padding * 0.5, width: sizeValue, height: sizeValue)
        circle.frame = frame
        circle.add(groupAnimation, forKey: "animation")
        layer.addSublayer(circle)
    }
}