// 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;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;

namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;

internal sealed class WhileKeywordRecommender() : AbstractSyntacticSingleKeywordRecommender(SyntaxKind.WhileKeyword)
{
    protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
    {
        if (context.IsStatementContext ||
            context.IsGlobalStatementContext)
        {
            return true;
        }

        // do {
        // } |

        // do {
        // } w|

        // Note: the case of
        //   do 
        //     Goo();
        //   |
        // is taken care of in the IsStatementContext case.

        var token = context.TargetToken;

        if (token.Kind() == SyntaxKind.CloseBraceToken &&
            token.Parent.IsKind(SyntaxKind.Block) &&
            token.Parent.IsParentKind(SyntaxKind.DoStatement))
        {
            return true;
        }

        return false;
    }
}