/* -*- 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