/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The ContainerView is a UIView subclassed to add code that works in conjunction with the parentView (SwitcherView) to enable toggling between a full screen view mode, and "swicher" mode that allows switching to another full screen view.

 */

import UIKit

class ContainerView: UIView, UIGestureRecognizerDelegate {

    var savedOriginY: CGFloat = 0.0

    var parentView: SwitcherView

    var isFullScreen: Bool = false

    var index: Int = 0

    var savedTransform: CATransform3D = CATransform3DIdentity

    var tapRecognizer: UITapGestureRecognizer!

    // Convenience initializer that sets up a web view.

    convenience init(frame: CGRect, parentView: SwitcherView, urlString: String) {

        self.init(frame: frame, parentView: parentView)

        let webSubview = UIWebView(frame: bounds)

        webSubview.isUserInteractionEnabled = SwitcherView.enableUserInteractionInSwitcher

        addSubview(webSubview)

        if let url = URL(string: urlString) {

            webSubview.loadRequest(URLRequest(url: url))

        } else {

            fatalError("<!> could not create url with string: `\(urlString)`")

        }

    }

    // Convenience initializer that sets takes a custom view as argument.

    convenience init(frame: CGRect, parentView: SwitcherView, customView: UIView) {

        self.init(frame: frame, parentView: parentView)

        customView.isUserInteractionEnabled = SwitcherView.enableUserInteractionInSwitcher

        addSubview(customView)

    }

    // Convenience initializer that sets an image as the layer's contents.

    convenience init(frame: CGRect, parentView: SwitcherView, imageName: String) {

        self.init(frame: frame, parentView: parentView)

        self.layer.contents = UIImage(named: imageName)!.cgImage!

    }

    init(frame: CGRect, parentView: SwitcherView) {

        self.parentView = parentView

        super.init(frame: frame)

        self.parentView = parentView

        savedOriginY = frame.origin.y

        // Create and initialize a tap gesture

        tapRecognizer = UITapGestureRecognizer(target:self, action:#selector(toggleAnimation))

        // Specify that the gesture must be a single tap

        tapRecognizer.numberOfTapsRequired = 1

        // Add the tap gesture recognizer to the view

        addGestureRecognizer(tapRecognizer)

        tapRecognizer.delegate = self

        // Add a shadow to the cards

        layer.shadowColor = UIColor.black.cgColor

        layer.shadowOpacity = 0.5

        layer.shadowPath = UIBezierPath(rect: bounds).cgPath

        layer.shadowRadius = 20.0

        // enable anti-aliasing

        layer.edgeAntialiasingMask = CAEdgeAntialiasingMask(rawValue:

            CAEdgeAntialiasingMask.layerLeftEdge.rawValue |

                CAEdgeAntialiasingMask.layerRightEdge.rawValue |

                CAEdgeAntialiasingMask.layerBottomEdge.rawValue |

                CAEdgeAntialiasingMask.layerTopEdge.rawValue)

    }

    required init?(coder aDecoder: NSCoder) {

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

    }

    // Instruct that the tap recognizer is allowed to work in conjunction with vanilla UIView recognizers.

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) -> Bool {

        return true

    }

    // Called by the tap gesture recognizer. Ushers the parent view's toggle between the switcher and full screen modes.

    func toggleAnimation() {

        isFullScreen = !isFullScreen

        parentView.animate(view: self, isFullScreen: isFullScreen)

        parentView.scrollView.isScrollEnabled = !isFullScreen

        // if user interaction should be disable in switcher mode, update that now

        if !SwitcherView.enableUserInteractionInSwitcher {

            for subview in subviews {

                subview.isUserInteractionEnabled = isFullScreen

            }

        }

    }

}