// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections.Immutable;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.UnusedReferences;
using Microsoft.CodeAnalysis.UnusedReferences.ProjectAssets;
 
namespace Microsoft.CodeAnalysis.Remote;
 
internal sealed class RemoteUnusedReferenceAnalysisService : BrokeredServiceBase, IRemoteUnusedReferenceAnalysisService
{
    internal sealed class Factory : FactoryBase<IRemoteUnusedReferenceAnalysisService>
    {
        protected override IRemoteUnusedReferenceAnalysisService CreateService(in ServiceConstructionArguments arguments)
            => new RemoteUnusedReferenceAnalysisService(arguments);
    }
 
    public RemoteUnusedReferenceAnalysisService(ServiceConstructionArguments arguments)
        : base(arguments)
    {
    }
 
    public ValueTask<ImmutableArray<ReferenceInfo>> GetUnusedReferencesAsync(Checksum solutionChecksum, string projectFilePath, string projectAssetsFilePath, ImmutableArray<ReferenceInfo> projectReferences, CancellationToken cancellationToken)
    {
        return RunServiceAsync(solutionChecksum, async solution =>
        {
            // Read specified references with dependency information from the project assets file.
            var references = await ProjectAssetsFileReader.ReadReferencesAsync(projectReferences, projectAssetsFilePath).ConfigureAwait(false);
 
            // Determine unused references
            var unusedReferences = await UnusedReferencesRemover.GetUnusedReferencesAsync(solution, projectFilePath, references, cancellationToken).ConfigureAwait(false);
 
            // Remove dependency information before returning.
            return unusedReferences.SelectAsArray(reference => reference.WithDependencies(null));
        }, cancellationToken);
    }
}