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using System.Globalization;
namespace Agent.App.Logging;
public sealed class RollingFileLog : IDisposable
{
private readonly RollingFileWriter _writer;
private readonly TextWriter _consoleWriter;
private readonly int _minimumLevel;
public RollingFileLog(string directory, long maxBytes, int retainedFiles, string minimumLevel = "information", TextWriter? consoleWriter = null)
{
Directory.CreateDirectory(directory);
_writer = new RollingFileWriter(Path.Combine(directory, "application.log"), maxBytes, retainedFiles);
_consoleWriter = consoleWriter ?? Console.Error;
_minimumLevel = ParseLevel(minimumLevel);
}
public void Information(string message) => Write("INF", message);
public void Operational(string message) => Write("INF", message, force: true);
public void Warning(string message) => Write("WRN", message);
public void Error(string message) => Write("ERR", message);
public void Fatal(string message) => Write("FTL", message);
private void Write(string level, string message, bool force = false)
{
if (!force && Level(level) < _minimumLevel) return;
string line = string.Create(CultureInfo.InvariantCulture, $"{DateTimeOffset.UtcNow:O} [{level}] {message}");
_consoleWriter.WriteLine(line);
_writer.WriteLine(line);
}
private static int ParseLevel(string level) => level.ToLowerInvariant() switch
{
"information" or "info" => 0,
"warning" or "warn" => 1,
"error" => 2,
"fatal" => 3,
_ => throw new ArgumentException($"Unknown logging level '{level}'.", nameof(level))
};
private static int Level(string level) => level switch { "INF" => 0, "WRN" => 1, "ERR" => 2, "FTL" => 3, _ => 0 };
public void Dispose()
{
_writer.Dispose();
}
}
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