// 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.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Classification;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.ExternalAccess.Razor
{
    internal sealed class RazorDocumentExcerptServiceWrapper : IDocumentExcerptService
    {
        private readonly IRazorDocumentExcerptServiceImplementation _impl;
 
        public RazorDocumentExcerptServiceWrapper(IRazorDocumentExcerptServiceImplementation impl)
            => _impl = impl;
 
        public async Task<ExcerptResult?> TryExcerptAsync(Document document, TextSpan span, ExcerptMode mode, ClassificationOptions classificationOptions, CancellationToken cancellationToken)
        {
            var razorMode = mode switch
            {
                ExcerptMode.SingleLine => RazorExcerptMode.SingleLine,
                ExcerptMode.Tooltip => RazorExcerptMode.Tooltip,
                _ => throw ExceptionUtilities.UnexpectedValue(mode),
            };
 
            var result = await _impl.TryExcerptAsync(document, span, razorMode, new RazorClassificationOptionsWrapper(classificationOptions), cancellationToken).ConfigureAwait(false);
 
            if (result is null)
                return null;
 
            var razorExcerpt = result.Value;
            return new ExcerptResult(razorExcerpt.Content, razorExcerpt.MappedSpan, razorExcerpt.ClassifiedSpans, razorExcerpt.Document, razorExcerpt.Span);
        }
    }
}