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

namespace Microsoft.CodeAnalysis.SymbolMapping;

[ExportWorkspaceService(typeof(ISymbolMappingService), ServiceLayer.Default), Shared]
internal sealed class DefaultSymbolMappingService : ISymbolMappingService
{
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public DefaultSymbolMappingService()
    {
    }

    public async Task<SymbolMappingResult> MapSymbolAsync(Document document, SymbolKey symbolId, CancellationToken cancellationToken)
    {
        var compilation = await document.Project.GetCompilationAsync(cancellationToken).ConfigureAwait(false);
        var symbol = symbolId.Resolve(compilation, cancellationToken: cancellationToken).Symbol;
        if (symbol != null)
        {
            return new SymbolMappingResult(document.Project, symbol);
        }

        return null;
    }

    public Task<SymbolMappingResult> MapSymbolAsync(Document document, ISymbol symbol, CancellationToken cancellationToken)
        => Task.FromResult(new SymbolMappingResult(document.Project, symbol));
}