using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace StgSharp.Data
{

    /// <summary>
    /// A class contains a sets of methods to serialize several types
    /// </summary>
    public static partial class Serializer
    {

        /**/
        public static byte[] Serialize(Dictionary<byte, BitArray> table)
        {
            using (var stream = new MemoryStream())
            {
                foreach (var pair in table)
                {
                    stream.WriteByte(pair.Key);
                    
                    byte[] keyCode = Serialize( pair.Value);
                    stream.WriteByte((byte)keyCode.Length);

                    stream.Write(keyCode, 0, keyCode.Length);
                }
                return stream.ToArray();
            }
        }
        /**/

        public static void Deserialize(byte[] data, out Dictionary<byte, BitArray> dict)
        {
            dict = new Dictionary<byte, BitArray>();
            int stat = 0; byte key = 0;
            byte[] raw = new byte[0];
            foreach (var b in data) 
            {
                switch (stat)
                {
                    case 0: //getting key
                        if (raw.Length != 0)
                        {
                            BitArray bits;
                            Deserialize(raw, out bits);
                            dict.Add(key, bits);
                        }
                        key = b;
                        stat -= 1;
                        break;
                    case -1: //getting length
                        raw = new byte[b];
                        stat = b;
                        break;
                    default:
                        raw[raw.Length - stat] = b;
                        stat--;
                        break;
                }
            }
        }

    }
}