// 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.Threading;
using Microsoft.CodeAnalysis.SignatureHelp;
using Microsoft.VisualStudio.Language.Intellisense;
using Microsoft.VisualStudio.Text;
 
namespace Microsoft.CodeAnalysis.Editor.Implementation.IntelliSense.SignatureHelp.Presentation;
 
internal sealed class Parameter : IParameter
{
    private readonly SignatureHelpParameter _parameter;
    private string _documentation;
    private readonly int _contentLength;
    private readonly int _index;
    private readonly int _prettyPrintedIndex;
 
    public string Documentation => _documentation ??= _parameter.DocumentationFactory(CancellationToken.None).GetFullText();
    public string Name => _parameter.Name;
    public Span Locus => new(_index, _contentLength);
    public Span PrettyPrintedLocus => new(_prettyPrintedIndex, _contentLength);
    public ISignature Signature { get; }
 
    public Parameter(
        Signature signature,
        SignatureHelpParameter parameter,
        string content,
        int index,
        int prettyPrintedIndex)
    {
        _parameter = parameter;
        this.Signature = signature;
        _contentLength = content.Length;
        _index = index;
        _prettyPrintedIndex = prettyPrintedIndex;
    }
}