// 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.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Structure;
using Microsoft.CodeAnalysis.ExternalAccess.FSharp.Structure;
using Microsoft.CodeAnalysis.Host.Mef;
using System;
 
namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp.Internal.Structure;
 
[Shared]
[ExportLanguageService(typeof(BlockStructureService), LanguageNames.FSharp)]
internal class FSharpBlockStructureService : BlockStructureService
{
    private readonly IFSharpBlockStructureService _service;
 
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public FSharpBlockStructureService(IFSharpBlockStructureService service)
    {
        _service = service;
    }
 
    public override string Language => LanguageNames.FSharp;
 
    public override async Task<BlockStructure> GetBlockStructureAsync(Document document, BlockStructureOptions options, CancellationToken cancellationToken)
    {
        var blockStructure = await _service.GetBlockStructureAsync(document, cancellationToken).ConfigureAwait(false);
        if (blockStructure != null)
        {
            return new BlockStructure(blockStructure.Spans.SelectAsArray(
                x => new BlockSpan(x.Type, x.IsCollapsible, x.TextSpan, x.HintSpan, subHeadings: default, x.BannerText, x.AutoCollapse, x.IsDefaultCollapsed)));
        }
        else
        {
            return null;
        }
    }
}