// 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.ComponentModel.Composition;
using System.Diagnostics.CodeAnalysis;
using Microsoft.CodeAnalysis.Editor;
using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.Shared.TestHooks;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Tagging;
using Microsoft.VisualStudio.Utilities;
 
namespace Microsoft.CodeAnalysis.Classification;
 
/// <summary>
/// This is the tagger we use for buffer classification scenarios.  It is only used for 
/// IAccurateTagger scenarios.  Namely: Copy/Paste and Printing.  We use an 'Accurate' buffer
/// tagger since these features need to get classification tags for the entire file.
/// 
/// i.e. if you're printing, you want semantic classification even for code that's not in view.
/// The same applies to copy/pasting.
/// </summary>
/// <remarks>
/// The <see cref="IAccurateTagger{T}"/> returned from <see cref="CreateTagger{T}"/> can be used on any thread.
/// </remarks>
[Export(typeof(ITaggerProvider))]
[TagType(typeof(IClassificationTag))]
[ContentType(ContentTypeNames.CSharpContentType)]
[ContentType(ContentTypeNames.VisualBasicContentType)]
[method: ImportingConstructor]
[method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
internal partial class CopyPasteAndPrintingClassificationBufferTaggerProvider(
    IThreadingContext threadingContext,
    ClassificationTypeMap typeMap,
    IAsynchronousOperationListenerProvider listenerProvider,
    IGlobalOptionService globalOptions) : ITaggerProvider
{
    private readonly IAsynchronousOperationListener _asyncListener = listenerProvider.GetListener(FeatureAttribute.Classification);
    private readonly IThreadingContext _threadingContext = threadingContext;
    private readonly ClassificationTypeMap _typeMap = typeMap;
    private readonly IGlobalOptionService _globalOptions = globalOptions;
 
    public Tagger? CreateTagger<T>(ITextBuffer buffer) where T : ITag
    {
        _threadingContext.ThrowIfNotOnUIThread();
 
        // The LSP client will handle producing tags when running under the LSP editor.
        // Our tagger implementation should return nothing to prevent conflicts.
        if (buffer.IsInLspEditorContext())
        {
            return null;
        }
 
        return new Tagger(this, buffer, _asyncListener, _globalOptions);
    }
 
    ITagger<T>? ITaggerProvider.CreateTagger<T>(ITextBuffer buffer)
        => CreateTagger<T>(buffer) as IAccurateTagger<T>;
}