// 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.
 
#nullable disable
 
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Host;
 
internal sealed class WorkspaceMetadataFileReferenceResolver : MetadataReferenceResolver, IEquatable<WorkspaceMetadataFileReferenceResolver>
{
    private readonly IMetadataService _metadataService;
    internal readonly RelativePathResolver PathResolver;
 
    public WorkspaceMetadataFileReferenceResolver(IMetadataService metadataService, RelativePathResolver pathResolver)
    {
        Debug.Assert(metadataService != null);
        Debug.Assert(pathResolver != null);
 
        _metadataService = metadataService;
        PathResolver = pathResolver;
    }
 
    public override ImmutableArray<PortableExecutableReference> ResolveReference(string reference, string baseFilePath, MetadataReferenceProperties properties)
    {
        var path = PathResolver.ResolvePath(reference, baseFilePath);
        if (path == null)
        {
            return [];
        }
 
        return [_metadataService.GetReference(path, properties)];
    }
 
    public bool Equals(WorkspaceMetadataFileReferenceResolver other)
    {
        return other != null
            && _metadataService == other._metadataService
            && PathResolver.Equals(other.PathResolver);
    }
 
    public override int GetHashCode()
        => Hash.Combine(_metadataService, Hash.Combine(PathResolver, 0));
 
    public override bool Equals(object other) => Equals(other as WorkspaceMetadataFileReferenceResolver);
}