using System.Drawing;
using System.Drawing.Imaging;
using System.IO.Pipes;

namespace ITNexusAgent;

// Läuft als User-Prozess (via schtasks), nicht als SYSTEM-Service
// Captured den Desktop und schickt JPEG-Frames via Named Pipe an den Service
public static class CaptureModeRunner
{
    private static readonly ImageCodecInfo JpegCodec =
        ImageCodecInfo.GetImageEncoders().First(c => c.FormatID == ImageFormat.Jpeg.Guid);

    public static void Run(string pipeName)
    {
        if (string.IsNullOrEmpty(pipeName)) return;

        try
        {
            using var pipe = new NamedPipeClientStream(".", pipeName, PipeDirection.Out);
            pipe.Connect(5000); // 5s timeout

            var encParams = new EncoderParameters(1);
            encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 60L);

            // Alle Screens zusammenführen (Multi-Monitor-Support)
            var allScreens = System.Windows.Forms.Screen.AllScreens;
            int left = allScreens.Min(s => s.Bounds.X);
            int top = allScreens.Min(s => s.Bounds.Y);
            int right = allScreens.Max(s => s.Bounds.X + s.Bounds.Width);
            int bottom = allScreens.Max(s => s.Bounds.Y + s.Bounds.Height);
            int totalW = right - left;
            int totalH = bottom - top;

            while (pipe.IsConnected)
            {
                try
                {
                    using var bmp = new Bitmap(totalW, totalH, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
                    using (var g = Graphics.FromImage(bmp))
                        g.CopyFromScreen(left, top, 0, 0, new Size(totalW, totalH));

                    byte[] jpeg;
                    using (var ms = new MemoryStream())
                    {
                        bmp.Save(ms, JpegCodec, encParams);
                        jpeg = ms.ToArray();
                    }

                    // Länge (4 Bytes LE) + JPEG-Daten
                    pipe.Write(BitConverter.GetBytes(jpeg.Length));
                    pipe.Write(jpeg);
                    pipe.Flush();
                }
                catch { break; }

                Thread.Sleep(150); // ~6-7 fps
            }
        }
        catch { /* Pipe nicht verfügbar oder Timeout → Exit */ }
    }
}