namespace PrismaticSync.Infrastructure;

/// <summary>
/// Minimal timestamped logger — writes to the console and appends to a rolling log file so an
/// unattended (Task Scheduler) run leaves an audit trail. Intentionally dependency-free.
/// </summary>
public static class Log
{
    private static string _logFile = "prismatic-sync.log";
    private static readonly object Gate = new();

    public static void Configure(string logFile) => _logFile = logFile;

    public static void Info(string message) => Write("INFO", message);
    public static void Warn(string message) => Write("WARN", message);
    public static void Error(string message) => Write("ERROR", message);

    private static void Write(string level, string message)
    {
        var line = $"[{DateTime.UtcNow:yyyy-MM-ddTHH:mm:ssZ}] {level,-5} {message}";

        // Live console stream (visible on a manual run); color-code so warnings/errors stand out.
        lock (Gate)
        {
            var color = level switch
            {
                "WARN" => ConsoleColor.Yellow,
                "ERROR" => ConsoleColor.Red,
                _ => (ConsoleColor?)null
            };

            if (color is { } c)
            {
                var previous = Console.ForegroundColor;
                Console.ForegroundColor = c;
                Console.WriteLine(line);
                Console.ForegroundColor = previous;
            }
            else
            {
                Console.WriteLine(line);
            }

            // File trail — never let logging break a run.
            try { File.AppendAllText(_logFile, line + Environment.NewLine); }
            catch { /* ignore */ }
        }
    }
}