//
//  Created by Jake Lin on 2/20/16.
//  Copyright © 2016 IBAnimatable. All rights reserved.
//

import UIKit

open class AnimatableNavigationController: UINavigationController, TransitionAnimatable {

  // MARK: - TransitionAnimatable
  @IBInspectable  var _transitionAnimationType: String? {
    didSet {
      if let _transitionAnimationType = _transitionAnimationType {
        transitionAnimationType = TransitionAnimationType(string: _transitionAnimationType)
      }
    }
  }
  open var transitionAnimationType: TransitionAnimationType = .none {
    didSet {
      configureNavigationControllerDelegate()
    }
  }
  @IBInspectable open var transitionDuration: Double = .nan {
    didSet {
      configureNavigationControllerDelegate()
    }
  }
  open var interactiveGestureType: InteractiveGestureType = .none {
    didSet {
      configureNavigationControllerDelegate()
    }
  }

  @IBInspectable var _interactiveGestureType: String? {
    didSet {
      if let _interactiveGestureType = _interactiveGestureType {
        interactiveGestureType = InteractiveGestureType(string: _interactiveGestureType)
      }
    }
  }

  // MARK: - Private
  // Must have a property to keep the reference alive because `UINavigationController.delegate` is `weak`
  fileprivate var navigator: Navigator?

  fileprivate func configureNavigationControllerDelegate() {
    if case .none = transitionAnimationType {
      navigator = nil
      delegate = nil
      return
    }
    var duration = transitionDuration
    // Set the default duration for transition
    if transitionDuration.isNaN {
      duration = defaultTransitionDuration
    }

    if case .none = interactiveGestureType {
      navigator = Navigator(transitionAnimationType: transitionAnimationType, transitionDuration: duration)
    } else {
      navigator = Navigator(transitionAnimationType: transitionAnimationType,
                            transitionDuration: duration,
                            interactiveGestureType: interactiveGestureType)
    }
    delegate = navigator
  }
}