namespace ExtensionExample;

public static class Extensions
{
    public static bool IsDownloadable(this OfferingType offeringType)
    {
        var validOfferings = new List<OfferingType>()
        {
            OfferingType.Template,
            OfferingType.Ebook,
            OfferingType.OfflineCourse
        };

        return validOfferings.Contains(offeringType);
    }
}

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

public sealed record Product(int Id, OfferingType Type);

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

    }
}

public sealed class ResourcesHelper
{
    public string? GetDownloadUrl(OfferingType offeringType)
    {
        if (offeringType.IsDownloadable())
        {
            // some code to do this...
            return "TODO: get the download URL";
        }

        return null;
    }

    public string? GetDefaultDownloadFileName(OfferingType offeringType)
    {
        if (offeringType.IsDownloadable())
        {
            // some code to do this...
            return "TODO: get the file name";
        }

        return null;
    }
}