using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.RemoteDesktop.Encoders
{
    /// <summary>
    /// Represents an <see cref="IFrame"/> JPEG encoder.
    /// </summary>
    /// <seealso cref="Tango.RemoteDesktop.FrameEncoder" />
    public class JpegEncoder : FrameEncoder
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="JpegEncoder"/> class.
        /// </summary>
        /// <param name="frame">The frame.</param>
        public JpegEncoder(IFrame frame) : base(frame)
        {
        }

        /// <summary>
        /// Returns a stream containing the encoded frame.
        /// </summary>
        /// <returns></returns>
        public override MemoryStream ToStream()
        {
            return ToStream(100);
        }

        /// <summary>
        /// Returns a stream containing the encoded frame with the specified quality.
        /// </summary>
        /// <param name="quality">The quality.</param>
        /// <returns></returns>
        public virtual MemoryStream ToStream(long quality)
        {
            var encoderParameters = new EncoderParameters(1);
            encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
            MemoryStream ms = new MemoryStream();
            Frame.ToBitmap().Save(ms, GetEncoder(ImageFormat.Jpeg), encoderParameters);
            ms.Position = 0;
            return ms;
        }

        /// <summary>
        /// Returns a byte array containing the encoded frame with the specified quality.
        /// </summary>
        /// <param name="quality">The quality.</param>
        /// <returns></returns>
        public byte[] ToArray(long quality)
        {
            using (MemoryStream ms = ToStream(quality))
            {
                return ms.ToArray();
            }
        }
    }
}