// 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.Collections.Immutable;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Shared.Extensions;
 
namespace Microsoft.CodeAnalysis.CSharp.CodeFixes.HideBase;
 
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.AddNew), Shared]
[method: ImportingConstructor]
[method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
internal sealed partial class HideBaseCodeFixProvider() : CodeFixProvider
{
    internal const string CS0108 = nameof(CS0108); // 'SomeClass.SomeMember' hides inherited member 'SomeClass.SomeMember'. Use the new keyword if hiding was intended.
 
    public override ImmutableArray<string> FixableDiagnosticIds => [CS0108];
 
    public override FixAllProvider GetFixAllProvider()
        => WellKnownFixAllProviders.BatchFixer;
 
    public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
    {
        var root = await context.Document.GetRequiredSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
 
        var diagnostic = context.Diagnostics.First();
        var diagnosticSpan = diagnostic.Location.SourceSpan;
 
        var token = root.FindToken(diagnosticSpan.Start);
 
        var originalNode = token.GetAncestor<PropertyDeclarationSyntax>() ??
            token.GetAncestor<MethodDeclarationSyntax>() ??
            (SyntaxNode?)token.GetAncestor<FieldDeclarationSyntax>();
 
        if (originalNode == null)
            return;
 
        context.RegisterCodeFix(new AddNewKeywordAction(context.Document, originalNode), context.Diagnostics);
    }
}