using System.Linq;
using Microsoft.Extensions.FileProviders;

namespace Umbraco.Extensions
{
    internal static class FileProviderExtensions
    {
        public static IFileProvider ConcatComposite(this IFileProvider fileProvider, params IFileProvider[] fileProviders)
        {
            var existingFileProviders = fileProvider switch
            {
                CompositeFileProvider compositeFileProvider => compositeFileProvider.FileProviders,
                _ => new[] { fileProvider }
            };

            return new CompositeFileProvider(existingFileProviders.Concat(fileProviders));
        }
    }
}