// UIImageViewExtensions.swift - Copyright 2020 SwifterSwift

#if canImport(UIKit) && !os(watchOS)
import UIKit

// MARK: - Methods

public extension UIImageView {
    /// SS: Set image from a URL.
    ///
    /// - Parameters:
    ///   - url: URL of image.
    ///   - contentMode: imageView content mode (default is .scaleAspectFit).
    ///   - placeHolder: optional placeholder image
    ///   - completionHandler: optional completion handler to run when download finishes (default is nil).
    func download(
        from url: URL,
        contentMode: UIView.ContentMode = .scaleAspectFit,
        placeholder: UIImage? = nil,
        completionHandler: ((UIImage?) -> Void)? = nil) {
        image = placeholder
        self.contentMode = contentMode
        URLSession.shared.dataTask(with: url) { data, response, _ in
            guard
                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
                let data = data,
                let image = UIImage(data: data) else {
                completionHandler?(nil)
                return
            }
            DispatchQueue.main.async { [unowned self] in
                self.image = image
                completionHandler?(image)
            }
        }.resume()
    }

    /// SS: Make image view blurry.
    ///
    /// - Parameter style: UIBlurEffectStyle (default is .light).
    func blur(withStyle style: UIBlurEffect.Style = .light) {
        let blurEffect = UIBlurEffect(style: style)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = bounds
        blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight] // for supporting device rotation
        addSubview(blurEffectView)
        clipsToBounds = true
    }

    /// SS: Blurred version of an image view.
    ///
    /// - Parameter style: UIBlurEffectStyle (default is .light).
    /// - Returns: blurred version of self.
    func blurred(withStyle style: UIBlurEffect.Style = .light) -> UIImageView {
        let imgView = self
        imgView.blur(withStyle: style)
        return imgView
    }
}

#endif
