// 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.Linq;
using System.Threading;
using Microsoft.CodeAnalysis;

namespace Microsoft.CodeAnalysis.IntroduceVariable;

internal abstract partial class AbstractIntroduceVariableService<TService, TExpressionSyntax, TTypeSyntax, TTypeDeclarationSyntax, TQueryExpressionSyntax, TNameSyntax>
{
    private sealed partial class State
    {
        private bool IsInQueryContext(
            CancellationToken cancellationToken)
        {
            if (!_service.IsInNonFirstQueryClause(Expression))
            {
                return false;
            }

            var semanticMap = GetSemanticMap(cancellationToken);
            if (!semanticMap.AllReferencedSymbols.Any(s => s is IRangeVariableSymbol))
            {
                return false;
            }

            var info = Document.SemanticModel.GetTypeInfo(Expression, cancellationToken);
            if (info.Type == null || info.Type.SpecialType == SpecialType.System_Void)
            {
                return false;
            }

            return true;
        }
    }
}