/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The transitioning delegate used for the ChatReplyViewController presentation.

 */

import UIKit

class ChatReplyTransitionDelegate: NSObject, UIViewControllerTransitioningDelegate {

    var presentationIsInteractive = false

    var currentTransitionProgress: CGFloat = 0.0 {

        didSet {

            currentInteractionController?.update(currentTransitionProgress)

        }

    }

    func completeCurrentInteractiveTransition() {

        currentInteractionController?.finish()

    }

    func cancelCurrentInteractiveTransition() {

        currentInteractionController?.cancel()

    }

    private var currentInteractionController: ChatReplyInteractionController? = nil

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        return ChatReplyPresentAnimator()

    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        return ChatReplyDismissAnimator()

    }

    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {

        return ChatReplyPresentationController(presentedViewController: presented, presenting: presenting)

    }

    func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {

        if presentationIsInteractive {

            currentInteractionController = ChatReplyInteractionController()

            return currentInteractionController

        }

        else {

            return nil

        }

    }

}