/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/* 

 * Copyright (c) 2009 IITP RAS

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * 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

 * 

 * Author: Pavel Boyko <boyko@iitp.ru>

 */

#include "ns3/mesh-wifi-beacon.h"

#include <algorithm>

namespace ns3 {

MeshWifiBeacon::MeshWifiBeacon (Ssid ssid, SupportedRates rates, uint64_t us)

{

  m_header.SetSsid (ssid);

  m_header.SetSupportedRates (rates);

  m_header.SetBeaconIntervalUs (us);

}

void MeshWifiBeacon::AddInformationElement (Ptr<WifiInformationElement> ie)

{

  m_elements.push_back (ie);

}

namespace {

/// aux sorter for Ptr<WifiInformationElement>

struct PIEComparator

{

  bool operator () (Ptr<WifiInformationElement> a, Ptr<WifiInformationElement> b) const

  {

    return ((*PeekPointer (a)) < (*PeekPointer(b)));

  }

};

}

Ptr<Packet> MeshWifiBeacon::CreatePacket ()

{

  Ptr<Packet> packet = Create<Packet> ();

  std::sort (m_elements.begin(), m_elements.end(), PIEComparator());

  std::vector< Ptr<WifiInformationElement> >::const_reverse_iterator i;

  for (i = m_elements.rbegin(); i != m_elements.rend(); ++i)

  {

    packet->AddHeader (**i);

  }

  packet->AddHeader (BeaconHeader());

  return packet;

}

WifiMacHeader MeshWifiBeacon::CreateHeader (Mac48Address address)

{

  WifiMacHeader hdr;

  hdr.SetBeacon ();

  hdr.SetAddr1 (Mac48Address::GetBroadcast ());

  hdr.SetAddr2 (address);

  hdr.SetAddr3 (address);

  hdr.SetDsNotFrom ();

  hdr.SetDsNotTo ();

  return hdr;

}

} // namespace