﻿// 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.CodeCleanup;
using Microsoft.CodeAnalysis.CSharp.CodeStyle;
using Microsoft.CodeAnalysis.CSharp.MisplacedUsingDirectives;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.OrganizeImports;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Simplification;

namespace Microsoft.CodeAnalysis.CSharp.Formatting
{
    [ExportNewDocumentFormattingProvider(LanguageNames.CSharp), Shared]
    internal class CSharpOrganizeUsingsNewDocumentFormattingProvider : INewDocumentFormattingProvider
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public CSharpOrganizeUsingsNewDocumentFormattingProvider()
        {
        }

        public async Task<Document> FormatNewDocumentAsync(Document document, Document? hintDocument, CodeCleanupOptions options, CancellationToken cancellationToken)
        {
            var organizeImportsService = document.GetRequiredLanguageService<IOrganizeImportsService>();
            var organizedDocument = await organizeImportsService.OrganizeImportsAsync(document, options.GetOrganizeImportsOptions(), cancellationToken).ConfigureAwait(false);

            return await MisplacedUsingDirectivesCodeFixProvider.TransformDocumentIfRequiredAsync(
                organizedDocument, options.SimplifierOptions, options.AddImportOptions.UsingDirectivePlacement, cancellationToken).ConfigureAwait(false);
        }
    }
}
