using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ClientUdp
{
    public enum Commande
    {
        POST, GET, HELP, QUIT, STOPSERVEUR, SUBSCRIBE, SUBSCRIBEv2, UNSUBSCRIBE
    };

    public enum CommandeType { REQUETE, REPONSE };

    class ChatMessage
    {
        public const int bufferSize = 1500;
        public const int pseudoSize = 30;

        public Commande commande;               // commande
        public CommandeType commandeType;       // type (Requête/Réponse)
        public int dataSize;                    // taille de la donnée
        public String pseudo;                   // pseudo
        public String data;                     // données de la commande

        public ChatMessage(Commande commande, CommandeType type, String pseudo, String data)
        {
            this.commande = commande;
            this.commandeType = type;
            this.dataSize = data.Length;
            this.pseudo = pseudo;
            this.data = data;
        }

        public ChatMessage(byte[] buffer)
        {
            int i = 2;

            if (buffer.Length > bufferSize)
                throw new ArgumentException("Buffer trop grand");

            this.commande = (Commande)buffer[0];
            this.commandeType = (CommandeType)buffer[1];

            while (i < pseudoSize && Encoding.ASCII.GetString(buffer, i, 1) != "\0")
            {
                this.pseudo += Encoding.ASCII.GetString(buffer, i, 1);
            }

            i = pseudoSize + 2;

            while (i < bufferSize && Encoding.ASCII.GetString(buffer, i, 1) != "\0")
            {
                this.data += Encoding.ASCII.GetString(buffer, i, 1);
            }
        }

        public byte[] GetBytes()
        {
            byte[] res = new byte[bufferSize];

            res[0] = (byte)this.commande;
            res[1] = (byte)this.commandeType;

            //encodage du pseudo et ajout au tableau de bytes
            Encoding.ASCII.GetBytes(this.pseudo, 0, this.pseudo.Length, res, 2);

            //encodage du message et ajout au tableau de bytes
            Encoding.ASCII.GetBytes(this.data, 0, this.data.Length, res, pseudoSize + 2);

            return res;
        }

        public override string ToString()
        {
            return "[" + commande + "," + commandeType + ",\"" + pseudo + "\"," + dataSize + ",\"" + data + "\"]";
        }

    }
}