// 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.

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

namespace NuGet.Protocol
{
    public class V2FeedListResourceProvider : ResourceProvider
    {
        public V2FeedListResourceProvider() : base(
            typeof(ListResource),
            nameof(V2FeedListResourceProvider),
            nameof(LocalPackageListResourceProvider))
        {
        }

        public override async Task<Tuple<bool, INuGetResource?>> TryCreate(SourceRepository source,
            CancellationToken token)
        {
            ListResource? resource = null;

            if (await source.GetFeedType(token) == FeedType.HttpV2)
            {
                var httpSource = await source.GetResourceAsync<HttpSourceResource>(token)
                    ?? throw new InvalidOperationException($"The source '{source.PackageSource.Source}' does not provide {nameof(HttpSourceResource)}.");

                var serviceDocument = await source.GetResourceAsync<ODataServiceDocumentResourceV2>(token);
                if (serviceDocument != null)
                {
                    var parser = new V2FeedParser(httpSource.HttpSource, serviceDocument.BaseAddress,
                        source.PackageSource.Source);
                    var feedCapabilityResource = new LegacyFeedCapabilityResourceV2Feed(parser,
                        serviceDocument.BaseAddress);
                    resource = new V2FeedListResource(parser, feedCapabilityResource, serviceDocument.BaseAddress);
                }
            }
            return new Tuple<bool, INuGetResource?>(resource != null, resource);
        }
    }
}