// 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;
using System.Collections.Immutable;
using System.Composition;
using Microsoft.CodeAnalysis.Host.Mef;
 
namespace Microsoft.CodeAnalysis.Editor.Test;
 
[ExportWorkspaceService(typeof(IDocumentTrackingService), ServiceLayer.Test), Shared, PartNotDiscoverable]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class TestDocumentTrackingService() : IDocumentTrackingService
{
    private DocumentId? _activeDocumentId;
 
    public event EventHandler<DocumentId?>? ActiveDocumentChanged;
 
    public void SetActiveDocument(DocumentId? newActiveDocumentId)
    {
        _activeDocumentId = newActiveDocumentId;
        ActiveDocumentChanged?.Invoke(this, newActiveDocumentId);
    }
 
    public DocumentId? TryGetActiveDocument()
        => _activeDocumentId;
 
    public ImmutableArray<DocumentId> GetVisibleDocuments()
        => _activeDocumentId != null ? [_activeDocumentId] : [];
}