// 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.Threading;
using System.Threading.Tasks;
using Microsoft.VisualStudio.Text.Editor;
 
namespace Microsoft.CodeAnalysis.Editor;
 
/// <summary>
/// Construct an instance of <see cref="SolutionPreviewItem"/>
/// </summary>
/// <param name="projectId"><see cref="ProjectId"/> for the <see cref="Project"/> that contains the content being visualized in the supplied <paramref name="lazyPreview"/></param>
/// <param name="documentId"><see cref="DocumentId"/> for the <see cref="Document"/> being visualized in the supplied <paramref name="lazyPreview"/></param>
/// <param name="lazyPreview">Lazily instantiated preview content.</param>
/// <remarks>Use lazy instantiation to ensure that any <see cref="ITextView"/> that may be present inside a given preview are only instantiated at the point
/// when the VS lightbulb requests that preview. Otherwise, we could end up instantiating a bunch of <see cref="ITextView"/>s most of which will never get
/// passed to the VS lightbulb. Such zombie <see cref="ITextView"/>s will never get closed and we will end up leaking memory.</remarks>
internal class SolutionPreviewItem(ProjectId? projectId, DocumentId? documentId, Func<CancellationToken, Task<object?>> lazyPreview)
{
    public readonly ProjectId? ProjectId = projectId;
    public readonly DocumentId? DocumentId = documentId;
    public readonly Func<CancellationToken, Task<object?>> LazyPreview = lazyPreview;
    public readonly string? Text;
 
    public SolutionPreviewItem(ProjectId? projectId, DocumentId? documentId, string text)
        : this(projectId, documentId, c => Task.FromResult<object?>(text))
    {
        Text = text;
    }
}