// 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 StaticProcessLogEnricher : IStaticLogEnricher
{
    private readonly string? _processId;
 
    public StaticProcessLogEnricher(IOptions<ProcessLogEnricherOptions> options)
    {
        var enricherOptions = Throw.IfMemberNull(options, options.Value);
 
        if (enricherOptions.ProcessId)
        {
#if NET5_0_OR_GREATER
            var pid = Environment.ProcessId;
#else
            var pid = System.Diagnostics.Process.GetCurrentProcess().Id;
#endif
 
            _processId = pid.ToInvariantString();
        }
    }
 
    public void Enrich(IEnrichmentTagCollector collector)
    {
        if (_processId != null)
        {
            collector.Add(ProcessEnricherTagNames.ProcessId, _processId);
        }
    }
}