//
//  PopupAnimators.swift
//  JiuLaiBao
//
//  Created by Dan Jiang on 2018/11/14.
//  Copyright © 2018 GuoXiaoMei. All rights reserved.
//

import UIKit

public protocol PopupAnimatable {
    var animateOverlayView: UIView { get }
    var animateContentView: UIView { get }
    var animateWidth: CGFloat { get }
    var animateHeight: CGFloat { get }
    var animateOverlayAlpha: CGFloat { get }
}

public extension PopupAnimatable {
    var animateWidth: CGFloat { return 0 }
    var animateHeight: CGFloat { return 0 }
    var animateOverlayAlpha: CGFloat { return 0 }
}

public class PopupAlertAnimator: NSObject, UIViewControllerAnimatedTransitioning {
    
    public var isPresented = true

    public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        if isPresented {
            return 0.3
        } else {
            return 0.15
        }
    }
    
    public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerView = transitionContext.containerView
        
        var animatedKey: UITransitionContextViewControllerKey = .from
        if isPresented {
            animatedKey = .to
        }
        
        guard let toViewController = transitionContext.viewController(forKey: .to),
            let toView = toViewController.view,
            let animatedViewController = transitionContext.viewController(forKey: animatedKey),
            let animatable = animatedViewController as? PopupAnimatable else {
                print("!!! Error: popup animation is not allowed !!!")
                return
        }
        
        let contentView = animatable.animateContentView
        if isPresented {
            containerView.addSubview(toView)
        }
        
        let duration = transitionDuration(using: transitionContext)
        if isPresented {
            UIView.animateKeyframes(withDuration: duration, delay: 0, options: [], animations: {
                UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5, animations: {
                    contentView.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
                })
                UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5, animations: {
                    contentView.transform = .identity
                })
            }, completion: { _ in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            })
        } else {
            UIView.animate(withDuration: duration, delay: 0, options: [.curveEaseInOut], animations: {
                contentView.alpha = 0
            }, completion: { _ in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            })
        }
    }
    
}

public class PopupSheetAnimator: NSObject, UIViewControllerAnimatedTransitioning {
    
    public var isPresented = true
    
    public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.3
    }
    
    public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerView = transitionContext.containerView
        
        var animatedKey: UITransitionContextViewControllerKey = .from
        if isPresented {
            animatedKey = .to
        }
        
        guard let toViewController = transitionContext.viewController(forKey: .to),
            let toView = toViewController.view,
            let animatedViewController = transitionContext.viewController(forKey: animatedKey),
            let animatable = animatedViewController as? PopupAnimatable else {
                print("!!! Error: popup animation is not allowed !!!")
                return
        }
        
        let contentView = animatable.animateContentView
        if isPresented {
            containerView.addSubview(toView)
            toView.layoutIfNeeded()
        }
        
        let duration = transitionDuration(using: transitionContext)
        let contentViewHeight = contentView.bounds.size.height
        let moveOut = CGAffineTransform(translationX: 0, y: contentViewHeight)
        if isPresented {
            contentView.transform = moveOut
            UIView.animate(withDuration: duration, delay: 0, options: [.curveEaseInOut], animations: {
                contentView.transform = .identity
            }, completion: { _ in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            })
        } else {
            UIView.animate(withDuration: duration, delay: 0, options: [.curveEaseInOut], animations: {
                contentView.transform = moveOut
            }, completion: { _ in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            })
        }
    }
    
}

public class PopupScaleAnimator: NSObject, UIViewControllerAnimatedTransitioning {
    
    public var isPresented = true
    
    public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.2
    }
    
    public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerView = transitionContext.containerView
        
        var animatedKey: UITransitionContextViewControllerKey = .from
        if isPresented {
            animatedKey = .to
        }
        
        guard let toViewController = transitionContext.viewController(forKey: .to),
            let toView = toViewController.view,
            let animatedViewController = transitionContext.viewController(forKey: animatedKey),
            let animatable = animatedViewController as? PopupAnimatable else {
                print("!!! Error: popup animation is not allowed !!!")
                return
        }
        
        let contentView = animatable.animateContentView
        let overlayView = animatable.animateOverlayView
        let overlayAlpha = animatable.animateOverlayAlpha
        if isPresented {
            containerView.addSubview(toView)
            toView.frame = containerView.bounds
        }
        
        let duration = transitionDuration(using: transitionContext)
        if isPresented {
            overlayView.alpha = 0
            contentView.transform = CGAffineTransform(scaleX: 0, y: 0)
            UIView.animate(withDuration: duration, animations: {
                overlayView.alpha = overlayAlpha
                contentView.transform = .identity
            }, completion: { _ in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            })
        } else {
            UIView.animate(withDuration: duration, animations: {
                overlayView.alpha = 0
                contentView.alpha = 0
                contentView.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
            }, completion: { _ in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            })
        }
    }
    
}