// 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 Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Microsoft.VisualStudio.Text;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Editor.Shared.Tagging;
 
internal partial class TaggerEventSources
{
    private class ParseOptionChangedEventSource(ITextBuffer subjectBuffer) : AbstractWorkspaceTrackingTaggerEventSource(subjectBuffer)
    {
        protected override void ConnectToWorkspace(Workspace workspace)
            => workspace.WorkspaceChanged += OnWorkspaceChanged;
 
        protected override void DisconnectFromWorkspace(Workspace workspace)
            => workspace.WorkspaceChanged -= OnWorkspaceChanged;
 
        private void OnWorkspaceChanged(object? sender, WorkspaceChangeEventArgs e)
        {
            if (e.Kind == WorkspaceChangeKind.ProjectChanged)
            {
                RoslynDebug.AssertNotNull(e.ProjectId);
                var oldProject = e.OldSolution.GetRequiredProject(e.ProjectId);
                var newProject = e.NewSolution.GetRequiredProject(e.ProjectId);
 
                if (!object.Equals(oldProject.ParseOptions, newProject.ParseOptions))
                {
                    var workspace = e.NewSolution.Workspace;
                    var documentId = workspace.GetDocumentIdInCurrentContext(SubjectBuffer.AsTextContainer());
                    if (documentId != null)
                    {
                        var relatedDocumentIds = e.NewSolution.GetRelatedDocumentIds(documentId);
 
                        if (relatedDocumentIds.Any(static (d, e) => d.ProjectId == e.ProjectId, e))
                        {
                            RaiseChanged();
                        }
                    }
                }
            }
        }
    }
}