// 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.
 
#nullable disable
 
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.VisualStudio.GraphModel;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.Progression;
 
internal sealed class OverriddenByGraphQuery : IGraphQuery
{
    public async Task<GraphBuilder> GetGraphAsync(Solution solution, IGraphContext context, CancellationToken cancellationToken)
    {
        var graphBuilder = await GraphBuilder.CreateForInputNodesAsync(solution, context.InputNodes, cancellationToken).ConfigureAwait(false);
 
        foreach (var node in context.InputNodes)
        {
            var symbol = graphBuilder.GetSymbol(node, cancellationToken);
            if (symbol != null)
            {
                var overriddenMember = symbol.GetOverriddenMember();
                if (overriddenMember != null)
                {
                    var symbolNode = await graphBuilder.AddNodeAsync(
                        overriddenMember, relatedNode: node, cancellationToken).ConfigureAwait(false);
                    graphBuilder.AddLink(node, RoslynGraphCategories.Overrides, symbolNode, cancellationToken);
                }
            }
        }
 
        return graphBuilder;
    }
}