ytLlive/Helpers/AppLog.cs

using System.IO;

namespace ytLive.Helpers;

/// <summary>
/// Minimal file logger used to diagnose startup/shutdown crashes on Windows,
/// where the WPF app has no visible console. Writes to
/// %APPDATA%\ytLlive\startup.log, appending synchronously so entries survive
/// a hard crash.
/// </summary>
public static class AppLog
{
    private static readonly string LogPath = Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
        "ytLlive",
        "startup.log");

    private static readonly object Gate = new();

    public static void Write(string message)
    {
        try
        {
            lock (Gate)
            {
                Directory.CreateDirectory(Path.GetDirectoryName(LogPath)!);
                File.AppendAllText(LogPath, $"{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff} {message}{Environment.NewLine}");
            }
        }
        catch
        {
            // Never let logging itself crash the app.
        }
    }

    public static void Write(Exception exception, string message)
    {
        Write($"{message}: {exception}");
    }
}