// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
using Microsoft.Extensions.Options;
using Microsoft.Shared.Diagnostics;
using Microsoft.Shared.Text;
 
namespace Microsoft.Extensions.Diagnostics.Enrichment;
 
/// <summary>
/// Enriches logs with process information.
/// </summary>
internal sealed class ProcessLogEnricher : ILogEnricher
{
    [ThreadStatic]
    private static string? _threadId;
    private readonly bool _threadIdEnabled;
 
    public ProcessLogEnricher(IOptions<ProcessLogEnricherOptions> options)
    {
        var enricherOptions = Throw.IfMemberNull(options, options.Value);
 
        _threadIdEnabled = enricherOptions.ThreadId;
    }
 
    public void Enrich(IEnrichmentTagCollector collector)
    {
        if (_threadIdEnabled)
        {
#pragma warning disable S2696 // Instance members should not write to "static" fields
            _threadId ??= Environment.CurrentManagedThreadId.ToInvariantString();
#pragma warning restore S2696 // Instance members should not write to "static" fields
 
            collector.Add(ProcessEnricherTagNames.ThreadId, _threadId);
        }
    }
}