using Optional;

namespace OO;

public enum OfferingType
{
    Course,
    Ebook,
    Book,
    Template,
    OfflineCourse,
}

public class Product(int id, OfferingType type)
{
    public virtual Option<string> GetDownloadUrl()
    {
        return Option.None<string>();
    }

    public virtual Option<string> GetDefaultDownloadFileName()
    {
        return Option.None<string>();
    }
}

public class DownloadProduct(int id, OfferingType type) : Product(id, type)
{
    public override Option<string> GetDefaultDownloadFileName()
    {
        return Option.Some("Some Value");
    }

    public override Option<string> GetDownloadUrl()
    {
        return Option.Some("Some Value");
    }
}

public sealed class ProductHandler()
{
    public void DoStuff(Product product)
    {
        var fileName = product.GetDefaultDownloadFileName();
        var downloadUrl = product.GetDownloadUrl();
    }
}