// 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 Microsoft.CodeAnalysis.UnusedReferences;
using Microsoft.VisualStudio.LanguageServices.ExternalAccess.ProjectSystem.Api;
using Roslyn.Utilities;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.UnusedReferences;
 
internal static class UnusedReferenceExtensions
{
    public static ReferenceInfo ToReferenceInfo(this ProjectSystemReferenceInfo projectSystemReference)
    {
        return new ReferenceInfo(
            (ReferenceType)projectSystemReference.ReferenceType,
            projectSystemReference.ItemSpecification,
            projectSystemReference.TreatAsUsed,
            ImmutableArray<string>.Empty,
            ImmutableArray<ReferenceInfo>.Empty);
    }
 
    public static ProjectSystemReferenceUpdate ToProjectSystemReferenceUpdate(this ReferenceUpdate referenceUpdate)
    {
        var updateAction = referenceUpdate.Action switch
        {
            UpdateAction.TreatAsUsed => ProjectSystemUpdateAction.SetTreatAsUsed,
            UpdateAction.TreatAsUnused => ProjectSystemUpdateAction.UnsetTreatAsUsed,
            UpdateAction.Remove => ProjectSystemUpdateAction.Remove,
            _ => throw ExceptionUtilities.Unreachable()
        };
        return new ProjectSystemReferenceUpdate(
            updateAction,
            referenceUpdate.ReferenceInfo.ToProjectSystemReferenceInfo());
    }
 
    public static ProjectSystemReferenceInfo ToProjectSystemReferenceInfo(this ReferenceInfo reference)
    {
        return new ProjectSystemReferenceInfo(
            (ProjectSystemReferenceType)reference.ReferenceType,
            reference.ItemSpecification,
            reference.TreatAsUsed);
    }
}