// 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.Generic;
using System.Composition;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.RemoveUnusedMembers;

namespace Microsoft.CodeAnalysis.CSharp.RemoveUnusedMembers;

[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.RemoveUnusedMembers), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class CSharpRemoveUnusedMembersCodeFixProvider() : AbstractRemoveUnusedMembersCodeFixProvider<FieldDeclarationSyntax>
{
    /// <summary>
    /// This method adjusts the <paramref name="declarators"/> to remove based on whether or not all variable declarators
    /// within a field declaration should be removed,
    /// i.e. if all the fields declared within a field declaration are unused,
    /// we can remove the entire field declaration instead of individual variable declarators.
    /// </summary>
    protected override void AdjustAndAddAppropriateDeclaratorsToRemove(HashSet<FieldDeclarationSyntax> fieldDeclarators, HashSet<SyntaxNode> declarators)
    {
        foreach (var fieldDeclarator in fieldDeclarators)
        {
            AdjustAndAddAppropriateDeclaratorsToRemove(fieldDeclarator, fieldDeclarator.Declaration.Variables, declarators);
        }
    }
}