// Good
NativePopup.show(image: Preset.Feedback.good,
                 title: "Helpful",
                 message: "Thanks for your feedback.")
// Bad
NativePopup.show(image: Preset.Feedback.bad,
                 title: "Not Helpful",
                 message: "Thanks for your feedback.")
// Custom Image
NativePopup.show(image: UIImage(named: "love")!,
                 title: "参考になった",
                 message: "フィードバックをありがとう\nございました。")
// Emoji
NativePopup.show(image: Character("🐶"),
                 title: "イッヌ",
                 message: "絵文字対応したワン")
// Title only
NativePopup.show(image: Preset.Feedback.good,
                 title: "Empty Message 🗑",
                 message: nil)
// Custom duration (default duration is 1.5 seconds)
NativePopup.show(image: Character("🔟"),
                    title: "10 seconds",
                    message: "Long duration🙇",
                    duration: 10)
// Like Apple Music
NativePopup.show(image: Preset.Feedback.done,
                 title: "Added to Library",
                 message: nil,
                 initialEffectType: .fadeIn)

public enum Image {
    case image(UIImage)
    case emoji(Character)

    func validate() {
        switch self {
        case .image(let image):
            assert(image.size.width == image.size.height, "Aspect ratio should be 1:1.")
        case .emoji:
            // MEMO: should check?
            break
        }
    }
}

public protocol ImageConvertible {
    var npImage: Image { get }
}

extension UIImage: ImageConvertible {
    public var npImage: Image { return .image(self) }
}

extension Character: ImageConvertible {
    public var npImage: Image { return .emoji(self) }
}

extension NativePopup {
    public struct Preset {
        private init() {}
        public enum Feedback: String, ImageConvertible {
            case
            good,
            bad

            public var npImage: Image {
                return .image(UIImage.init(nativePopupNamed: "feedback_\(rawValue)"))
            }
        }
    }
}