// 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.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Shared.Extensions;
 
namespace Microsoft.CodeAnalysis.CSharp.ConvertToRecord;
 
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.ConvertToRecord), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class CSharpConvertToRecordCodeFixProvider() : CodeFixProvider
{
    private const string CS8865 = nameof(CS8865); // Only records may inherit from records.
 
    public override FixAllProvider? GetFixAllProvider()
        => null;
 
    public override ImmutableArray<string> FixableDiagnosticIds
        => [CS8865];
 
    public override async Task RegisterCodeFixesAsync(CodeFixContext context)
    {
        var document = context.Document;
        var span = context.Span;
        var cancellationToken = context.CancellationToken;
 
        // get the class declaration. The span should be on the base type in the base list
        var root = await document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
        var baseTypeSyntax = root.FindNode(span) as BaseTypeSyntax;
 
        var typeDeclaration = baseTypeSyntax?.GetAncestor<TypeDeclarationSyntax>();
        if (typeDeclaration == null)
            return;
 
        var action = await ConvertToRecordEngine.GetCodeActionAsync(
            document, typeDeclaration, cancellationToken).ConfigureAwait(false);
 
        if (action != null)
            context.RegisterCodeFix(action, context.Diagnostics);
    }
}