//
//  UIImageView+Rx.swift
//  RxCocoa
//
//  Created by Krunoslav Zaher on 4/1/15.
//  Copyright © 2015 Krunoslav Zaher. All rights reserved.
//

#if os(iOS) || os(tvOS)

import Foundation
#if !RX_NO_MODULE
import RxSwift
#endif
import UIKit

extension UIImageView {
    
    /**
    Bindable sink for `image` property.
    */
    public var rx_image: AnyObserver<UIImage?> {
        return self.rx_imageAnimated(nil)
    }
    
    /**
    Bindable sink for `image` property.
    
    - parameter transitionType: Optional transition type while setting the image (kCATransitionFade, kCATransitionMoveIn, ...)
    */
    public func rx_imageAnimated(transitionType: String?) -> AnyObserver<UIImage?> {
        return UIBindingObserver(UIElement: self) { imageView, image in
            if let transitionType = transitionType {
                if image != nil {
                    let transition = CATransition()
                    transition.duration = 0.25
                    transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
                    transition.type = transitionType
                    imageView.layer.addAnimation(transition, forKey: kCATransition)
                }
            }
            else {
                imageView.layer.removeAllAnimations()
            }
            imageView.image = image
        }.asObserver()
    }
    
}

#endif