extension UIAlertController {

    // MARK: - Lifecycle

    convenience init(error: Error) {
        self.init(
            title: Localizable.errorTitle,
            message: error.localizedDescription,
            preferredStyle: .alert
        )
        let action = UIAlertAction(
            title: Localizable.buttonOk,
            style: .default,
            handler: nil
        )
        addAction(action)
    }

    struct Action<T> {
        var title: String?
        var style: UIAlertAction.Style
        var value: T?

        static func action(
            title: String?,
            style: UIAlertAction.Style = .default,
            value: T?) -> Action {
            return Action(
                title: title,
                style: style,
                value: value
            )
        }
    }

    static func present<T>(
        in viewController: UIViewController,
        title: String? = nil,
        message: String? = nil,
        style: UIAlertController.Style,
        actions: [Action<T>]) -> Observable<T> {
        return Observable.create { observer in
            let alertController = UIAlertController(
                title: title,
                message: message,
                preferredStyle: style
            )
            actions.enumerated().forEach { _, action in
                let alertAction = UIAlertAction(
                title: action.title,
                style: action.style) { _ in
                    if action.style != .destructive {
                        observer.onNext(action.value!)
                    }
                    observer.onCompleted()
                }
                alertController.addAction(alertAction)
            }
            viewController.present(alertController, animated: true, completion: nil)
            return Disposables.create()
        }
    }
}