using System;
using System.IO;
using System.Text;

namespace UtopiaCanteenSystem.Services;

public static class Logger
{
    private static readonly object _lock = new();

    public static void Log(Exception ex, string context = "")
    {
        try
        {
            if (ex == null) return;

            var localAppData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
            var appRoot = Path.Combine(localAppData, "UtopiaCanteenSystem");
            var logsDir = Path.Combine(appRoot, "Logs");
            var logFile = Path.Combine(logsDir, "error.log");

            try
            {
                if (!Directory.Exists(logsDir))
                    Directory.CreateDirectory(logsDir);
            }
            catch
            {
                return;
            }

            var sb = new StringBuilder();
            sb.AppendLine($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}]");
            if (!string.IsNullOrWhiteSpace(context))
                sb.AppendLine($"Context: {context}");
            sb.AppendLine($"Message: {ex.Message}");
            sb.AppendLine($"StackTrace: {ex.StackTrace}");
            if (ex.InnerException != null)
                sb.AppendLine($"InnerException: {ex.InnerException.Message}");
            sb.AppendLine("----------------------------------------------------");

            lock (_lock)
            {
                File.AppendAllText(logFile, sb.ToString());
            }
        }
        catch
        {
            // never throw from logger
        }
    }
}