using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
using NuGet.Configuration;
using NuGet.Packaging;
using NuGet.Packaging.Core;
using NuGet.Protocol;
using NuGet.Protocol.Core.Types;
using System.IO;

namespace MyProject
{
    public class CopyFileFromNuGetPackage : Task
    {
        [Required]
        public string PackageId { get; set; }

        [Required]
        public string PackageVersion { get; set; }

        [Required]
        public string SourceFilePath { get; set; }

        [Required]
        public string DestinationFilePath { get; set; }

        public override bool Execute()
        {
            var packageIdentity = new PackageIdentity(PackageId, NuGetVersion.Parse(PackageVersion));
            var packageSource = new PackageSource("https://api.nuget.org/v3/index.json");
            var packageDownloadContext = new PackageDownloadContext(packageSource, null, false, null, NullLogger.Instance);
            var packageExtractionContext = new PackageExtractionContext(
                PackageSaveMode.Defaultv3,
                XmlDocFileSaveMode.None,
                ClientPolicyContext.GetClientPolicy(NullLogger.Instance, null),
                NullLogger.Instance);

            using (var sourceCacheContext = new SourceCacheContext())
            {
                var packageSourceProvider = new PackageSourceProvider(Settings.LoadDefaultSettings(null), new[] { packageSource });
                var packageMetadataResource = Repository.Provider.GetCoreV3().GetResource<PackageMetadataResource>();
                var packageMetadata = packageMetadataResource.GetMetadata(packageIdentity, sourceCacheContext, NullLogger.Instance, packageSourceProvider);
                var packageDownloadResource = Repository.Provider.GetCoreV3().GetResource<PackageDownloadResource>();
                var packageStream = packageDownloadResource.GetStream(packageIdentity, packageDownloadContext);
                var packageReader = new PackageReader(packageStream);

                var fileStream = packageReader.GetFile(SourceFilePath);
                using (var destinationStream = File.Create(DestinationFilePath))
                {
                    fileStream.CopyTo(destinationStream);
                }
            }

            return true;
        }
    }
}