//
//  Created by Jake Lin on 2/29/16.
//  Copyright © 2016 IBAnimatable. All rights reserved.
//

import Foundation

/**
 TransitionPresenter Manager: Used to cache the Presenters for Present and Dismiss transitions
 */
public class TransitionPresenterManager {
  // MARK: - Singleton

  public static let shared = TransitionPresenterManager()

  private init() {}

  // MARK: - Private
  private var cache = [TransitionAnimationType: TransitionPresenter]()

  // MARK: Internal Interface
  public func retrievePresenter(transitionAnimationType: TransitionAnimationType,
                                transitionDuration: Duration = defaultTransitionDuration,
                                interactiveGestureType: InteractiveGestureType? = nil) -> TransitionPresenter {
    // Get the cached presenter
    let presenter = cache[transitionAnimationType]
    if let presenter = presenter {
      // Update the `transitionDuration` and `interactiveGestureType` every time to reuse the same presenter with the same type
      presenter.transitionDuration = transitionDuration
      presenter.interactiveGestureType = interactiveGestureType
      return presenter
    }

    // Create a new if cache doesn't exist
    let newPresenter = TransitionPresenter(transitionAnimationType: transitionAnimationType,
                                           transitionDuration: transitionDuration,
                                           interactiveGestureType: interactiveGestureType)
    cache[transitionAnimationType] = newPresenter
    return newPresenter
  }
}