// 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.
 
#nullable disable
 
using System.Collections.Generic;
using System.Threading;
using Microsoft.VisualStudio.Language.Intellisense;
 
namespace Microsoft.CodeAnalysis.Editor.Implementation.Peek;
 
internal sealed class ExternalFilePeekableItem : PeekableItem
{
    private readonly FileLinePositionSpan _span;
    private readonly IPeekRelationship _relationship;
 
    public ExternalFilePeekableItem(
        FileLinePositionSpan span,
        IPeekRelationship relationship,
        IPeekResultFactory peekResultFactory)
        : base(peekResultFactory)
    {
        _span = span;
        _relationship = relationship;
    }
 
    public override IEnumerable<IPeekRelationship> Relationships
        => [_relationship];
 
    public override IPeekResultSource GetOrCreateResultSource(string relationshipName)
        => new ResultSource(this);
 
    private sealed class ResultSource : IPeekResultSource
    {
        private readonly ExternalFilePeekableItem _peekableItem;
 
        public ResultSource(ExternalFilePeekableItem peekableItem)
            => _peekableItem = peekableItem;
 
        public void FindResults(string relationshipName, IPeekResultCollection resultCollection, CancellationToken cancellationToken, IFindPeekResultsCallback callback)
        {
            if (relationshipName != _peekableItem._relationship.Name)
            {
                return;
            }
 
            resultCollection.Add(PeekHelpers.CreateDocumentPeekResult(_peekableItem._span.Path, _peekableItem._span.Span, _peekableItem._span.Span, _peekableItem.PeekResultFactory));
        }
    }
}