// 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.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.SymbolMapping;

namespace Microsoft.CodeAnalysis.MetadataAsSource;

[ExportWorkspaceServiceFactory(typeof(ISymbolMappingService), [WorkspaceKind.MetadataAsSource])]
[Shared]
internal sealed class SymbolMappingServiceFactory : IWorkspaceServiceFactory
{
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public SymbolMappingServiceFactory()
    {
    }

    public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices)
        => new SymbolMappingService(((MetadataAsSourceWorkspace)workspaceServices.Workspace).FileService);

    private sealed class SymbolMappingService(MetadataAsSourceFileService fileService) : ISymbolMappingService
    {
        private readonly MetadataAsSourceFileService _fileService = fileService;

        public Task<SymbolMappingResult?> MapSymbolAsync(Document document, SymbolKey symbolId, CancellationToken cancellationToken)
        {
            if (document.Project.Solution.WorkspaceKind is not WorkspaceKind.MetadataAsSource)
                throw new ArgumentException(FeaturesResources.Document_must_be_contained_in_the_workspace_that_created_this_service, nameof(document));

            return _fileService.MapSymbolAsync(document, symbolId, cancellationToken);
        }

        public Task<SymbolMappingResult?> MapSymbolAsync(Document document, ISymbol symbol, CancellationToken cancellationToken)
            => MapSymbolAsync(document, SymbolKey.Create(symbol, cancellationToken), cancellationToken);
    }
}