// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

#nullable disable

using System;
using System.Threading;
using System.Threading.Tasks;
using NuGet.Protocol.Core.Types;

namespace NuGet.Protocol
{
    public class RegistrationResourceV3Provider : ResourceProvider
    {
        public RegistrationResourceV3Provider()
            : base(typeof(RegistrationResourceV3),
                  nameof(RegistrationResourceV3),
                  NuGetResourceProviderPositions.Last)
        {
        }

        public override async Task<Tuple<bool, INuGetResource>> TryCreate(SourceRepository source, CancellationToken token)
        {
            RegistrationResourceV3 regResource = null;
            var serviceIndex = await source.GetResourceAsync<ServiceIndexResourceV3>(token);

            if (serviceIndex != null)
            {
                //This will come back as null if there are no matching RegistrationsBaseUrl types
                var baseUrl = serviceIndex.GetServiceEntryUri(ServiceTypes.RegistrationsBaseUrl);

                if (baseUrl != null)
                {
                    var httpSourceResource = await source.GetResourceAsync<HttpSourceResource>(token);

                    // construct a new resource
                    regResource = new RegistrationResourceV3(httpSourceResource.HttpSource, baseUrl);
                }
            }

            return new Tuple<bool, INuGetResource>(regResource != null, regResource);
        }
    }
}