// 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]
    internal sealed class TestDocumentTrackingService : IDocumentTrackingService
    {
        private DocumentId? _activeDocumentId;
 
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public TestDocumentTrackingService()
        {
        }
 
        public bool SupportsDocumentTracking => true;
 
        public event EventHandler<DocumentId?>? ActiveDocumentChanged;
 
        public event EventHandler<EventArgs> NonRoslynBufferTextChanged
        {
            add { }
            remove { }
        }
 
        public void SetActiveDocument(DocumentId? newActiveDocumentId)
        {
            _activeDocumentId = newActiveDocumentId;
            ActiveDocumentChanged?.Invoke(this, newActiveDocumentId);
        }
 
        public DocumentId? TryGetActiveDocument()
            => _activeDocumentId;
 
        public ImmutableArray<DocumentId> GetVisibleDocuments()
            => _activeDocumentId != null ? ImmutableArray.Create(_activeDocumentId) : ImmutableArray<DocumentId>.Empty;
    }
}