// 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 Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.MakeTypeAbstract;
 
namespace Microsoft.CodeAnalysis.CSharp.MakeTypeAbstract;
 
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.MakeTypeAbstract), 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 class CSharpMakeTypeAbstractCodeFixProvider() : AbstractMakeTypeAbstractCodeFixProvider<TypeDeclarationSyntax>
{
    public override ImmutableArray<string> FixableDiagnosticIds { get; } =
           ["CS0513"];
 
    protected override bool IsValidRefactoringContext(SyntaxNode? node, [NotNullWhen(true)] out TypeDeclarationSyntax? typeDeclaration)
    {
        switch (node)
        {
            case MethodDeclarationSyntax method:
                if (method.Body != null || method.ExpressionBody != null)
                {
                    typeDeclaration = null;
                    return false;
                }
 
                break;
 
            case AccessorDeclarationSyntax accessor:
                if (accessor.Body != null || accessor.ExpressionBody != null)
                {
                    typeDeclaration = null;
                    return false;
                }
 
                break;
 
            default:
                typeDeclaration = null;
                return false;
        }
 
        var enclosingType = node.FirstAncestorOrSelf<TypeDeclarationSyntax>();
        if (enclosingType?.Kind() is SyntaxKind.ClassDeclaration or SyntaxKind.RecordDeclaration &&
            !enclosingType.Modifiers.Any(SyntaxKind.AbstractKeyword) && !enclosingType.Modifiers.Any(SyntaxKind.StaticKeyword))
        {
            typeDeclaration = enclosingType;
            return true;
        }
 
        typeDeclaration = null;
        return false;
    }
}