//
//  ViewController.swift
//  GA_Animation
//
//  Created by houjianan on 2017/3/15.
//  Copyright © 2017年 houjianan. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var myView: UIView!
    
    lazy var v: UIView = {
        let v = UIView(frame: CGRect(x: 100, y: 100, width: 50, height: 50))
        v.backgroundColor = UIColor.orange
        self.view.addSubview(v)
        return v
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        /*
         CABasicAnimation和CAKeyframeAnimation的区别是前者只有开始和结束帧，后者可以有若干帧
         */
        
//        basicAnimation()
        
//        keyAnimation()
  
//        groupAnimation()

    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
//        transitionAnimation()
        myViewAnimation()
    }
    
    // xib中控件简单动画
    @IBOutlet weak var widthConstraint: NSLayoutConstraint!
    private func myViewAnimation() {
        // 001
        let myViewWidth = myView.constraints.filter({
            c in
            // width的设置是xib中identifier属性
            return c.identifier == "width"
        }).first
        myViewWidth?.constant = 0
        // 002
        widthConstraint.constant = 0
        
        UIView.animate(withDuration: 0.4, animations: {
            self.view.layoutIfNeeded()
        })
    }
    
    // 关键帧动画
    private func basicAnimation() {
        let basicAnimation = CABasicAnimation(keyPath: "position")
        // 持续时间
        basicAnimation.duration = 0.05
        // 重复次数
        basicAnimation.repeatCount = MAXFLOAT
        // 动画完成后是否移除动画
        basicAnimation.isRemovedOnCompletion = true
        // 动画结束时是否执行逆动画
        basicAnimation.autoreverses = true
        // 开始值
        basicAnimation.fromValue = NSValue(cgPoint: CGPoint(x: self.view.center.x - 4.0, y: self.view.center.y))
        // 结束值
        basicAnimation.toValue = NSValue(cgPoint: CGPoint(x: self.view.center.x + 4.0, y: self.view.center.y))
        v.layer.add(basicAnimation, forKey: nil)
    }
    // 关键帧动画
    private func keyAnimation() {
        let keyAnimation = CAKeyframeAnimation(keyPath: "bounds")
        keyAnimation.values = [NSValue(cgRect: CGRect(x: 120, y: 120,
                                                      width: 90, height: 90)),
                               NSValue(cgRect: CGRect(x: 120, y: 120,
                                                      width: 100, height: 100)),
                               NSValue(cgRect: CGRect(x: 120, y: 120,
                                                      width: 50, height: 50))]
        // 可以设置一个CGPathRefCGMutablePathRef,让层跟着路径移动。path只对CALayer的anchorPoint和position起作用。如果你设置了path，那么values将被忽略
        /*
         let path = CGMutablePath()
         path.addRect(self.view.bounds)
         keyAnimation.path = path
         */
        keyAnimation.repeatCount = MAXFLOAT
        keyAnimation.isRemovedOnCompletion = false
        keyAnimation.fillMode = kCAFillModeForwards
        keyAnimation.duration = 4.0
        keyAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
        keyAnimation.delegate = self
        v.layer.add(keyAnimation, forKey: nil)
    }
    // 关键帧组合动画
    private func groupAnimation() {
        // 大小
        let morph1 = addAnimation(fromValue: NSValue(cgRect: CGRect(x: 120, y: 120, width: 90, height: 90)), toValue: NSValue(cgRect: CGRect(x: 120, y: 120, width: 200, height: 200)), keyPath: "bounds") { (a) -> () in
            print("morph1完成")
        }
        // 位置
        let morph2 = addAnimation(fromValue: NSValue(cgPoint: CGPoint(x: 150, y: 150)), toValue: NSValue(cgPoint: CGPoint(x: self.view.frame.size.width / 2, y: self.view.frame.size.height / 2)), keyPath: "position", handler: nil)
        // 背景色
        let morph3 = addAnimation(fromValue: UIColor.orange.cgColor, toValue: UIColor.yellow.cgColor, keyPath: "backgroundColor", handler: nil)
        // 圆角
        let morph4 = addAnimation(fromValue: 1, toValue: 30, keyPath: "cornerRadius", handler: nil)
        // Y轴翻转
        let morph5 = addAnimation(fromValue: 0, toValue: M_PI, keyPath: "transform.rotation.y", handler: nil)
        
        let groupAnimation = CAAnimationGroup()
        groupAnimation.duration = 2
        groupAnimation.repeatCount = MAXFLOAT
        groupAnimation.animations = [morph1, morph2, morph3, morph4, morph5]
        v.layer.add(groupAnimation, forKey: nil)
    }
    
    private func addAnimation<T: Any>(duration: Double = 2, fromValue: T, toValue: T, keyPath: String, handler: ((_ a: CABasicAnimation) -> ())?) -> CABasicAnimation  {
        print(keyPath)
        let morph = CABasicAnimation(keyPath: keyPath)
        morph.duration = duration
        morph.fromValue = fromValue
        morph.toValue = toValue
        morph.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
        handler?(morph)
        return morph
    }
    
    // 转场动画
    private func transitionAnimation() {
        let animation = CATransition()
        animation.duration = 1
        animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)
        animation.fillMode = kCAFillModeForwards
//        animation.subtype = kCATransitionFromLeft
        /*
         pageCurl   向上翻一页
         pageUnCurl 向下翻一页
         rippleEffect 滴水效果
         suckEffect 收缩效果，如一块布被抽走
         cube 立方体效果
         oglFlip 上下翻转效果
         */
        animation.type = "oglFlip"
        // 动画幅度 如果endProgress == startProgress没有动画效果
        animation.endProgress = 0.99
        animation.startProgress = 0.01
        
        let vc = Target1ViewController()
        // 001
        self.view.window?.layer.add(animation, forKey: nil)
        self.present(vc, animated: false, completion: nil)
        // 002
        self.navigationController?.view.layer.add(animation, forKey: nil)
        self.navigationController?.pushViewController(vc, animated: false)
    }
}

extension ViewController: CAAnimationDelegate {
    func animationDidStart(_ anim: CAAnimation) {
    
    }
    
    func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
        print(flag)
    }
}


class Target1ViewController: UIViewController {
    override func viewDidLoad() {
        self.view.backgroundColor = UIColor.brown
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
    }
}