using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using Jypeli;

public static class Screencap
{
    public static void WriteBmp( Stream outStream, Jypeli.Image image )
    {
        byte[] buffer = image.GetByteArray();

        BinaryWriter writer = new BinaryWriter(outStream);
        {
            // Magic
            writer.Write('B');
            writer.Write('M');

            // Size of the BMP file
            //writer.Write( (int)(54 + buffer.Length) );
            writer.Write((int)(122 + buffer.Length));

            // Unused
            writer.Write( (int)0 );

            // Offset of pixel array
            //writer.Write( (int)0x36 );
            writer.Write((int)0x7A);

            // DIB header length
            //writer.Write( (int)0x28 );
            writer.Write( (int)108 );

            // Image dimensions
            writer.Write( image.Width );
            writer.Write( image.Height );

            // Number of color planes
            writer.Write( (short)1 );

            // Bits per pixel
            writer.Write( (short)32 );

            // No compression, specify bitfields
            //writer.Write( (int)0 );
            writer.Write( (int)3 );

            // Size of raw bitmap data
            writer.Write( (int)buffer.Length );

            // Print resolution as pixels per meter (this is 72 dpi)
            writer.Write( (int)2835 );
            writer.Write( (int)2835 );

            // Number of colors in the palette
            writer.Write( (int)0 );

            // Number of important colors
            writer.Write( (int)0 );

            // Bit masks: red, green, blue, alpha (big endian)
            writer.Write( new byte[] { 0xFF, 0x00, 0x00, 0x00 } );
            writer.Write( new byte[] { 0x00, 0xFF, 0x00, 0x00 } );
            writer.Write( new byte[] { 0x00, 0x00, 0xFF, 0x00 } );
            writer.Write( new byte[] { 0x00, 0x00, 0x00, 0xFF } );

            // Color space: "Win"
            writer.Write(' ');
            writer.Write('n');
            writer.Write('i');
            writer.Write('W');

            // Unused (color space endpoints & gamma)
            writer.Write( new byte[36] );
            writer.Write( (int)0 );
            writer.Write( (int)0 );
            writer.Write( (int)0 );

            // Bitmap data
            writer.Write( buffer );
        }

        // Do not call Close or Dispose! It closes the stream too.
        writer.Flush();
    }

    public static void EncodePng(Stream outStream, Stream inStream)
    {
		var encoders = ImageCodecInfo.GetImageEncoders();

        Bitmap bmp = new Bitmap(inStream);
        bmp.Save(outStream, ImageFormat.Png);
    }

    public static void EncodeJpeg(Stream outStream, Stream inStream)
    {
        var bitmap = new Bitmap(inStream);

        ImageCodecInfo jpgEncoder = GetCodecByDescription("JPEG");
        Encoder encoder2 = System.Drawing.Imaging.Encoder.Quality;
        EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1);
        EncoderParameter parameter = new EncoderParameter(encoder2, 50L);
        parameters.Param[0] = parameter;

        //System.IO.Stream stream = new MemoryStream();
        //bitmap.Save(stream, jpgEncoder, parameters);
        bitmap.Save(outStream, jpgEncoder, parameters);

        /*var bytes = ((MemoryStream)stream).ToArray();
        System.IO.Stream inputStream = new MemoryStream(bytes);
        Bitmap fromDisk = new Bitmap(@"C:\Temp\TestJPEG.jpg");
        Bitmap fromStream = new Bitmap(inputStream);*/
    }

    private static ImageCodecInfo GetCodecByDescription( string desc )
    {
        foreach ( var codec in ImageCodecInfo.GetImageEncoders().FindAll(x => x.FormatDescription == "JPEG") )
        {
            return codec;
        }

        throw new IOException(desc + " codec not found");
    }
}