// 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.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Shared.Extensions;
 
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
 
internal class GlobalKeywordRecommender : AbstractSyntacticSingleKeywordRecommender
{
    public GlobalKeywordRecommender()
        : base(SyntaxKind.GlobalKeyword)
    {
    }
 
    protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
    {
        var syntaxTree = context.SyntaxTree;
 
        if (syntaxTree.IsMemberDeclarationContext(position, context.LeftToken))
        {
            var token = context.TargetToken;
            if (token.GetAncestor<EnumDeclarationSyntax>() == null)
                return true;
        }
 
        return
            context.IsTypeContext ||
            context.IsEnumBaseListContext ||
            UsingKeywordRecommender.IsUsingDirectiveContext(context, forGlobalKeyword: true, cancellationToken);
    }
}