/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2005 INRIA
 *
 * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */

#include "adhoc-wifi-mac.h"
#include "dca-txop.h"
#include "mac-low.h"
#include "mac-rx-middle.h"
#include "wifi-phy.h"
#include "dcf-manager.h"
#include "ns3/packet.h"
#include "ns3/log.h"

NS_LOG_COMPONENT_DEFINE ("AdhocWifiMac");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (AdhocWifiMac);

TypeId 
AdhocWifiMac::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::AdhocWifiMac")
    .SetParent<WifiMac> ()
    .AddConstructor<AdhocWifiMac> ()
    ;
  return tid;
}

AdhocWifiMac::AdhocWifiMac ()
{
  m_rxMiddle = new MacRxMiddle ();
  m_rxMiddle->SetForwardCallback (MakeCallback (&AdhocWifiMac::ForwardUp, this));

  m_low = CreateObject<MacLow> ();
  m_low->SetRxCallback (MakeCallback (&MacRxMiddle::Receive, m_rxMiddle));
  m_low->SetMac (this);

  m_dcfManager = new DcfManager ();
  m_dcfManager->SetupLowListener (m_low);

  m_dca = CreateObject<DcaTxop> ();
  m_dca->SetLow (m_low);
  m_dca->SetManager (m_dcfManager);
}
AdhocWifiMac::~AdhocWifiMac ()
{}

void
AdhocWifiMac::DoDispose (void)
{
  delete m_rxMiddle;
  delete m_dcfManager;
  m_rxMiddle = 0;
  m_dcfManager = 0;
  m_low = 0;
  m_phy = 0;
  m_dca = 0;
  m_stationManager = 0;
  WifiMac::DoDispose ();
}

void 
AdhocWifiMac::SetSlot (Time slotTime)
{
  m_dcfManager->SetSlot (slotTime);
  WifiMac::SetSlot (slotTime);
}
void 
AdhocWifiMac::SetSifs (Time sifs)
{
  m_dcfManager->SetSifs (sifs);
  WifiMac::SetSifs (sifs);
}
void 
AdhocWifiMac::SetEifsNoDifs (Time eifsNoDifs)
{
  m_dcfManager->SetEifsNoDifs (eifsNoDifs);
  WifiMac::SetEifsNoDifs (eifsNoDifs);
}

void 
AdhocWifiMac::SetWifiPhy (Ptr<WifiPhy> phy)
{
  m_phy = phy;
  m_dcfManager->SetupPhyListener (phy);
  m_low->SetPhy (phy);
}
void 
AdhocWifiMac::SetWifiRemoteStationManager (Ptr<WifiRemoteStationManager> stationManager)
{
  m_stationManager = stationManager;
  m_dca->SetWifiRemoteStationManager (stationManager);
  m_low->SetWifiRemoteStationManager (stationManager);
}
void 
AdhocWifiMac::SetForwardUpCallback (Callback<void,Ptr<Packet>, const Mac48Address &> upCallback)
{
  m_upCallback = upCallback;
}
void 
AdhocWifiMac::SetLinkUpCallback (Callback<void> linkUp)
{
  // an Adhoc network is always UP.
  linkUp ();
}
void 
AdhocWifiMac::SetLinkDownCallback (Callback<void> linkDown)
{
  //XXX
}
Mac48Address 
AdhocWifiMac::GetAddress (void) const
{
  return m_address;
}
Ssid 
AdhocWifiMac::GetSsid (void) const
{
  return m_ssid;
}
Mac48Address 
AdhocWifiMac::GetBssid (void) const
{
  // XXX the bssid should be generated by the procedure
  // described in ieee802.11 section 11.1.3
  return Mac48Address::GetBroadcast ();
}
void 
AdhocWifiMac::SetAddress (Mac48Address address)
{
  m_address = address;
}
void 
AdhocWifiMac::SetSsid (Ssid ssid)
{
  // XXX: here, we should start a special adhoc network
  m_ssid = ssid;
}

void 
AdhocWifiMac::Enqueue (Ptr<const Packet> packet, Mac48Address to)
{
  NS_LOG_DEBUG ("enqueue size="<<packet->GetSize ()<<", to="<<to);
  WifiMacHeader hdr;
  hdr.SetType (WIFI_MAC_DATA);
  hdr.SetAddr1 (to);
  hdr.SetAddr2 (GetAddress ());
  hdr.SetAddr3 (GetBssid ());
  hdr.SetDsNotFrom ();
  hdr.SetDsNotTo ();

  WifiRemoteStation *destination = m_stationManager->Lookup (to);
  if (destination->IsBrandNew ())
    {
      // in adhoc mode, we assume that every destination
      // supports all the rates we support.
      for (uint32_t i = 0; i < m_phy->GetNModes (); i++)
        {
          destination->AddSupportedMode (m_phy->GetMode (i));
        }
      destination->RecordDisassociated ();
    }

  m_dca->Queue (packet, hdr);
}

void 
AdhocWifiMac::ForwardUp (Ptr<Packet> packet, WifiMacHeader const *hdr)
{
  NS_LOG_DEBUG ("received size="<<packet->GetSize ()<<", from="<<hdr->GetAddr2 ());
  if (hdr->GetAddr1 ().IsBroadcast () || hdr->GetAddr1 () == GetAddress ())
    {
      m_upCallback (packet, hdr->GetAddr2 ());
    }
}

} // namespace ns3