// 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;
using System.Composition;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ExternalAccess.FSharp.Editor;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Navigation;
 
namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp.Internal.Editor;
 
[ExportLanguageService(typeof(IDefinitionLocationService), LanguageNames.FSharp), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class FSharpDefinitionLocationService(
    IFSharpGoToDefinitionService service) : IDefinitionLocationService
{
    public Task<DefinitionLocation?> GetDefinitionLocationAsync(Document document, int position, CancellationToken cancellationToken)
        => DefinitionLocationServiceHelpers.GetDefinitionLocationFromLegacyImplementationsAsync(
            document, position,
            async cancellationToken =>
            {
                var items = await service.FindDefinitionsAsync(document, position, cancellationToken).ConfigureAwait(false);
                return items?.Select(i => (i.Document, i.SourceSpan));
            },
            cancellationToken);
}