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

namespace Converting
{
    public class Conv
    {
        public delegate void PositionEventHandler(object sender, int pos);
        public event PositionEventHandler OnNewPosition;
        public delegate void FinishEventHandler(object sender, int exitcode);
        public event FinishEventHandler OnFinish;
        public void ConvertFile(String input, String output, bool encode)
        {
            BinaryReader reader = new BinaryReader(File.Open(input, FileMode.Open));
            BinaryWriter writer = new BinaryWriter(File.Open(output, FileMode.Create));
            Converter conv = new Converter();
            int i = 0;
            try
            {
                while (true)
                {
                    byte inp = reader.ReadByte();
                    byte oup = 0;
                    if (encode)
                    {
                        oup = conv.encoding((byte)i++, inp);
                    }
                    else
                    {
                        oup = conv.decoding((byte)i++, inp);
                    }
                    if (this.OnNewPosition != null)
                    {
                        this.OnNewPosition(this, i);
                    }
                    writer.Write(oup);
                    //System.Threading.Thread.Sleep(1);
                }
            }
            catch (EndOfStreamException) { }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                if (this.OnFinish != null)
                {
                    this.OnFinish(this, 1);
                    reader.Close();
                    writer.Close();
                    return;
                }
            }
            if (this.OnFinish != null)
            {
                this.OnFinish(this, 0);
                reader.Close();
                writer.Close();
                return;
            }
        }
    }
}