//
//  Created by Tom Baranes on 21/08/16.
//  Copyright © 2016 IBAnimatable. All rights reserved.
//

import UIKit

/// Protocol for activity indicator view.
public protocol ActivityIndicatorAnimatable: class {
  /// Animation type
  var animationType: ActivityIndicatorType { get set }
  /// Color of the indicator
  var color: UIColor { get set }
  /// Specify whether hide the indicator when the animation stopped
  var hidesWhenStopped: Bool { get set }
  /// Animating status
  var isAnimating: Bool { get set }
}

public extension ActivityIndicatorAnimatable where Self: UIView {

  /// Start animating the activity indicator
  func startAnimating() {
    isHidden = false
    configureLayer()
    isAnimating = true
  }

  /// Stop animating the activity indicator
  func stopAnimating() {
    layer.sublayers = nil
    isAnimating = false
    if hidesWhenStopped {
      isHidden = true
    }
  }

}

private extension ActivityIndicatorAnimatable where Self: UIView {

  func configureLayer() {
    guard layer.sublayers == nil else {
      return
    }

    if case .none = animationType {
      return
    }

    animationType.configureAnimation(in: layer, size: bounds.size, color: color)
    layer.speed = 1
  }

}