// 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.Collections.Immutable;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.ExtractClass;
using Microsoft.CodeAnalysis.Host.Mef;

namespace Microsoft.CodeAnalysis.CSharp.CodeRefactorings.ExtractClass;

[ExportCodeRefactoringProvider(LanguageNames.CSharp, Name = PredefinedCodeRefactoringProviderNames.ExtractClass), Shared]
[ExtensionOrder(After = PredefinedCodeRefactoringProviderNames.ExtractInterface)]
[ExtensionOrder(After = PredefinedCodeRefactoringProviderNames.UseExpressionBody)]
internal sealed class CSharpExtractClassCodeRefactoringProvider : AbstractExtractClassRefactoringProvider
{
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public CSharpExtractClassCodeRefactoringProvider()
        : base(null)
    {
    }

    /// <summary>
    /// Test purpose only.
    /// </summary>
    [SuppressMessage("RoslynDiagnosticsReliability", "RS0034:Exported parts should have [ImportingConstructor]", Justification = "Used incorrectly by tests")]
    internal CSharpExtractClassCodeRefactoringProvider(IExtractClassOptionsService optionsService)
        : base(optionsService)
    {
    }

    protected override async Task<SyntaxNode?> GetSelectedClassDeclarationAsync(CodeRefactoringContext context)
    {
        var relaventNodes = await context.GetRelevantNodesAsync<ClassDeclarationSyntax>().ConfigureAwait(false);
        return relaventNodes.FirstOrDefault();
    }

    protected override Task<ImmutableArray<SyntaxNode>> GetSelectedNodesAsync(CodeRefactoringContext context)
        => NodeSelectionHelpers.GetSelectedDeclarationsOrVariablesAsync(context);
}