import UIKit.UIGestureRecognizerSubclass
import AudioToolbox.AudioServices

@available(iOS 9, *)
/*
 * UINavigationBarのバックボタンのアクションと3DTouchのアクションが衝突しないようにするために
 * UILongPressGestureRecognizerを継承してminimumPressDurationをしたいからです。
 */
class SAThirdDimensionalTouchRecognizer: UILongPressGestureRecognizer {
    // 3DTouchの深度をパーセンテージにするために使います
    private(set) var percentage: CGFloat = 0
    // 3DTouchのアクションが完了する割合を設定するために使います
    var threshold: CGFloat = 1

    init(target: AnyObject?, action: Selector, threshold: CGFloat) {
        self.threshold = threshold
        super.init(target: target, action: action)
    }

    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent) {
        super.touchesMoved(touches, withEvent: event)

        guard let touch = touches.first else {
            return
        }
        percentage = max(0, min(1, touch.force / touch.maximumPossibleForce))
        /*
         * minimumPressDurationで設定した秒数後にstateが.Begin -> .Changedになる可能性があるので
         * stateが.Changedだった場合を条件文に含んでいます
         */
        if percentage > threshold && state == .Changed {
            state = .Ended
            // 3DTouchのバイブレーションがなかったので、システムのバイブレーションを使います。
            AudioServicesPlayAlertSound(kSystemSoundID_Vibrate)
        }
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent) {
        super.touchesEnded(touches, withEvent: event)
        // touchesMovedでstateを.Endにするので、ここに入った場合は失敗となります
        state = .Failed
    }

    override func reset() {
        super.reset()
        percentage = 0
    }
}

let gestureRecognizer = SAThirdDimensionalTouchRecognizer(target: self, action: "handleThirdDimensionalTouch:", threshold: 0.75)
gestureRecognizer.minimumPressDuration = 0.2
gestureRecognizer.delegate = self
navigationBar.addGestureRecognizer(gestureRecognizer)

extension SAHistoryNavigationViewController: UIGestureRecognizerDelegate {
    public func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
        if let _ = visibleViewController?.navigationController?.navigationBar.backItem, view = gestureRecognizer.view as? UINavigationBar {
            var height = 64.0
            if visibleViewController?.navigationController?.navigationBarHidden == true {
                height = 44.0
            }
            let backButtonFrame = CGRect(x: 0.0, y :0.0,  width: 100.0, height: height)
            let touchPoint = gestureRecognizer.locationInView(view)
            if CGRectContainsPoint(backButtonFrame, touchPoint) {
                return true
            }
        }
        return false
    }
}

extension SAHistoryNavigationViewController : UIViewControllerTransitioningDelegate {
    public func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return SAHistoryViewAnimatedTransitioning(isPresenting: true)
    }

    public func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return SAHistoryViewAnimatedTransitioning(isPresenting: false)
    }

    public func interactionControllerForPresentation(animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
        // UIPercentDrivenInteractiveTransitionのproperty
        return interactiveTransition
    }
}

@available(iOS 9, *)
func handleThirdDimensionalTouch(gesture: SAThirdDimensionalTouchRecognizer) {
    switch gesture.state {
    case .Began:
        let viewController = ViewController()
        viewController.transitioningDelegate = self
        presentViewController(viewController, animated: true, completion: nil)

    case .Changed:
        // インタラクティブな遷移をさせるために、3D Touchの深度を元にしたパーセンテージを渡しています。
        interactiveTransition?.updateInteractiveTransition(min(gesture.threshold, max(0, gesture.percentage)))

    case .Ended:
        if gesture.percentage >= gesture.threshold {
            interactiveTransition?.finishInteractiveTransition()
        } else {
            interactiveTransition?.cancelInteractiveTransition()
        }

        case .Cancelled, .Failed, .Possible:
            break
        }
    }