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

/*

 * Copyright (c) 2006,2007 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 "ns3/packet.h"

#include "ns3/simulator.h"

#include "ns3/mobility-model.h"

#include "ns3/net-device.h"

#include "ns3/node.h"

#include "wifi-channel.h"

#include "propagation-loss-model.h"

#include "propagation-delay-model.h"

namespace ns3 {

WifiChannel::WifiChannel ()

  : m_loss (PropagationLossModel::CreateDefault ()),

    m_delay (PropagationDelayModel::CreateDefault ())

{}

WifiChannel::~WifiChannel ()

{}

void 

WifiChannel::SetPropationLossModel (Ptr<PropagationLossModel> loss)

{

  m_loss = loss;

}

void 

WifiChannel::SetPropagationDelayModel (Ptr<PropagationDelayModel> delay)

{

  m_delay = delay;

}

void 

WifiChannel::Add (Ptr<NetDevice> device,  ReceiveCallback callback)

{

  m_deviceList.push_back (std::make_pair (device, callback));

}

void 

WifiChannel::Send (Ptr<NetDevice> sender, const Packet &packet, double txPowerDbm,

                   WifiMode wifiMode, WifiPreamble preamble) const

{

  Ptr<MobilityModel> senderMobility = sender->GetNode ()->QueryInterface<MobilityModel> (MobilityModel::iid);

  uint32_t j = 0;

  for (DeviceList::const_iterator i = m_deviceList.begin (); i != m_deviceList.end (); i++)

    {

      if (sender != i->first)

        {

          Ptr<MobilityModel> receiverMobility = i->first->GetNode ()->QueryInterface<MobilityModel> (MobilityModel::iid);

          double distance = senderMobility->GetDistanceFrom (receiverMobility);

          Time delay = m_delay->GetDelay (distance);

          double rxPowerDbm = m_loss->GetRxPower (txPowerDbm, distance);

          Simulator::Schedule (delay, &WifiChannel::Receive, this, 

                               j, packet, rxPowerDbm, wifiMode, preamble);

        }

      j++;

    }

}

void

WifiChannel::Receive (uint32_t i, const Packet &packet, double rxPowerDbm,

                      WifiMode txMode, WifiPreamble preamble) const

{

  m_deviceList[i].second (packet, rxPowerDbm, txMode, preamble);

}

uint32_t 

WifiChannel::GetNDevices (void) const

{

  return m_deviceList.size ();

}

Ptr<NetDevice> 

WifiChannel::GetDevice (uint32_t i) const

{

  return m_deviceList[i].first;

}

} // namespace ns3