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/* gs_transmitter.cc - Classe de transmission des grosses string */
/* Simulotron - Programme de simulation de robot {{{
 *
 * Copyright (C) 2005 Nicolas Haller
 *
 * Robot APB Team/Efrei 2005.
 *        Web: http://assos.efrei.fr/robot/
 *      Email: robot AT efrei DOT fr
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * }}} */

#include "gs/gs_transmitter.hh"
#include "gs/gs_message.hh"
#include "socket/socket_client.hh"

#include <sys/select.h>
#include <iostream>

GSTransmitter::GSTransmitter(SocketServer & socket)
    :socket_(socket)
{
}

GSTransmitter::GSTransmitter(const std::string & address, int port)
{
    socket_.connect(address, port);
}

/// Renvoie 0 quand un message est r�cup�r�, -1 sinon
int
GSTransmitter::getGS(GSMessage & gsm)
{
    ///\bug Pas portable le code, suppose des int � 4 octect
    fd_set fds;
    timeval tv = {0, 0};
    unsigned int size = 0;

    FD_ZERO(&fds);
    FD_SET(socket_.getFD(), &fds);
    //On lit le socket que si y'a quelque chose � lire
    ///\bug C'est top ca?
    if(select(socket_.getFD() + 1, &fds, NULL, NULL, &tv) > 0)
    {
	std::string strRead (socket_.read ());
	strBrut_ += strRead;
    }
    // Si la chaine � moins de 4 octect, y'a pas de message
    if (strBrut_.size() < 4)
	return -1;
    // On r�cup�re la taille de la gs grace au 4 premier octect
    size = static_cast<int> (strBrut_[0]) << 24 
	| static_cast<int> (strBrut_[1]) << 16 
	| static_cast<int> (strBrut_[2]) << 8 
	| static_cast<int> (strBrut_[3]);
    if(size > strBrut_.size() - 4)
	return -1;
    gsm.appendGS (strBrut_.substr(4, size).data(), size);
    strBrut_.erase (0, size + 4);
    return 0;
}

void
GSTransmitter::putGS(const GSMessage & gsm)
{
    ///\bug Pas portable le code, suppose des int � 4 octect
    std::string gs(gsm.getGS ());
    char bsize[4];
    int size = gs.size();
    // On transfore la taille de la gs en 4 octect qui seront envoy� en premier
    bsize[0] = static_cast<char> (size >> 24);
    bsize[1] = static_cast<char> (size >> 16);
    bsize[2] = static_cast<char> (size >> 8);
    bsize[3] = static_cast<char> (size);
    gs.insert(0, bsize, 4);
    socket_.write (gs);
}