/*------------------------------------------------------------------------------
 * Author - Rob (http://stackoverflow.com/users/1185/rob)
 * -----------------------------------------------------------------------------
 * Notes
 * - This program provides one example of fitting an image into 140 characters,
 *   as per the challenge on StackOverflow at the following URL:
 *   http://stackoverflow.com/questions/891643/twitter-image-encoding-challenge
 * -----------------------------------------------------------------------------
 * Sources / References
 * - http://www.bobpowell.net/grayscale.htm
 * - http://porg.es/blog/what-can-we-fit-in-140-characters
 * ---------------------------------------------------------------------------*/
using System;
using System.Drawing;
using System.IO;
using System.Text;
using System.Diagnostics;

namespace Twitter_Image
{
    public class DataPoint
    {
        public byte Luma { get; set; }
        public byte Count { get; set; }
    }

    class Program
    {
        #region " About Message "
        private const string About = @"Twitter Image - A StackOverflow Demostration
Author - http://stackoverflow.com/users/1185/rob";
        #endregion

        #region " Information Message "
        private const string Info = @"Usage
tweetimage encode [input] [output]
tweetimage decode [imput] [output]

Notes
- Encoded output will be text
- Decoded output will follow extension if supported";
        #endregion

        static void Main(string[] args)
        {
            string[] images = {
                "cornell-box",
                "cornell-box-large",
                "lena",
                "lena-large",
                "mona-lisa",
                "mona-lisa-large",
                "stackoverflow-logo"};

            for (int ndx = 0; ndx < images.Length; ndx++)
            {
                Stopwatch timer = new Stopwatch();
                // Encode the image
                Console.WriteLine(images[ndx]);
                timer.Start();
                char[] encoded = TwitterImage.EncodeImage(new Bitmap(images[ndx] + ".png"));
                timer.Stop();
                SaveData(encoded, images[ndx] + ".txt");
                Console.WriteLine("Encoded Size: " + encoded.Length);
                Console.WriteLine("Runtime: " + timer.ElapsedMilliseconds.ToString() + "ms");
                // Decode the image
                Bitmap image = TwitterImage.ReadEncodedImage(images[ndx] + ".txt");
                image.Save(images[ndx] + ".bmp");
            }
            Console.WriteLine("Press any key to continue");
            Console.ReadKey();
        }

        /// <summary>
        /// Save the character data provided to the file.
        /// </summary>
        private static void SaveData(char[] data, string fileName)
        {
            byte[] bytes = new byte[data.Length * sizeof(char)];
            Buffer.BlockCopy(data, 0, bytes, 0, bytes.Length);
            FileStream file = new FileStream(fileName, FileMode.Create);
            StreamWriter stream = new StreamWriter(file, Encoding.Unicode);
            stream.Write(Encoding.Unicode.GetString(bytes));
            stream.Close();
            file.Close();
        }
    }
}