// 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.Collections.Generic;
using Microsoft.VisualStudio.LanguageServices.Implementation.Interop;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel;
 
internal sealed class NodeKeyValidation
{
    private readonly Dictionary<ComHandle<EnvDTE80.FileCodeModel2, FileCodeModel>, List<GlobalNodeKey>> _nodeKeysMap = [];
 
    public NodeKeyValidation()
    {
    }
 
    public NodeKeyValidation(ProjectCodeModelFactory projectCodeModelFactory)
    {
        foreach (var projectCodeModel in projectCodeModelFactory.GetAllProjectCodeModels())
        {
            var fcms = projectCodeModel.GetCachedFileCodeModelInstances();
 
            foreach (var fcm in fcms)
            {
                var globalNodeKeys = fcm.Object.GetCurrentNodeKeys();
 
                _nodeKeysMap.Add(fcm, globalNodeKeys);
            }
        }
    }
 
    public void AddFileCodeModel(FileCodeModel fileCodeModel)
    {
        var handle = new ComHandle<EnvDTE80.FileCodeModel2, FileCodeModel>(fileCodeModel);
        var globalNodeKeys = fileCodeModel.GetCurrentNodeKeys();
 
        _nodeKeysMap.Add(handle, globalNodeKeys);
    }
 
    public void RestoreKeys()
    {
        foreach (var e in _nodeKeysMap)
        {
            e.Key.Object.ResetElementKeys(e.Value);
        }
 
        _nodeKeysMap.Clear();
    }
}