namespace Nonemm.EngineProbe;

/// The probe's report: every line on the screen and in the file, stamped with
/// the milliseconds since the probe started. The timing is the point of the
/// report, so nothing is written without it.
public sealed class ProbeLog : IDisposable
{
    private readonly StreamWriter file;
    private readonly Lock gate = new();
    private readonly long started = Environment.TickCount64;

    public ProbeLog(string path)
    {
        Path = System.IO.Path.GetFullPath(path);
        file = new StreamWriter(Path, append: false) { AutoFlush = true };
    }

    public string Path { get; }

    public long Elapsed => Environment.TickCount64 - started;

    public void Write(string text)
    {
        lock (gate)
        {
            string line = $"{Elapsed,7} ms  {text}";
            Console.WriteLine(line);
            file.WriteLine(line);
        }
    }

    /// A heading, so the file can be read a step at a time.
    public void Step(string name)
    {
        lock (gate)
        {
            Console.WriteLine();
            Console.WriteLine($"== {name}");
            file.WriteLine();
            file.WriteLine($"== {name}");
        }
    }

    public void Dispose() => file.Dispose();
}