/* -*-  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 "ns3/log.h"

#include "ns3/pointer.h"

#include "wifi-channel.h"

#include "propagation-loss-model.h"

#include "propagation-delay-model.h"

NS_LOG_COMPONENT_DEFINE ("WifiChannel");

namespace ns3 {

TypeId 

WifiChannel::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::WifiChannel")

    .SetParent<Channel> ()

    .AddConstructor<WifiChannel> ()

    .AddAttribute ("PropagationLossModel", "XXX",

                   MakePointerAccessor (&WifiChannel::m_loss),

                   MakePointerChecker<PropagationLossModel> ())

    .AddAttribute ("PropagationDelayModel", "XXX",

                   MakePointerAccessor (&WifiChannel::m_delay),

                   MakePointerChecker<PropagationDelayModel> ())

    ;

  return tid;

}

WifiChannel::WifiChannel ()

{}

WifiChannel::~WifiChannel ()

{

  m_deviceList.clear ();

}

void 

WifiChannel::SetPropagationLossModel (Ptr<PropagationLossModel> loss)

{

  m_loss = loss;

}

void 

WifiChannel::SetPropagationDelayModel (Ptr<PropagationDelayModel> delay)

{

  m_delay = delay;

}

void 

WifiChannel::Add (Ptr<NetDevice> device, Ptr<WifiPhy> phy)

{

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

}

void 

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

                   WifiMode wifiMode, WifiPreamble preamble) const

{

  Ptr<MobilityModel> senderMobility = 0;

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

    {

      if (sender == i->second)

        {

          senderMobility = i->first->GetNode ()->GetObject<MobilityModel> ();

          break;

        }

    }

  NS_ASSERT (senderMobility != 0);

  uint32_t j = 0;

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

    {

      if (sender != i->second)

        {

          Ptr<MobilityModel> receiverMobility = i->first->GetNode ()->GetObject<MobilityModel> ();

          Time delay = m_delay->GetDelay (senderMobility, receiverMobility);

          double rxPowerDbm = txPowerDbm + m_loss->GetLoss (senderMobility, receiverMobility);

          NS_LOG_DEBUG ("propagation: txPower="<<txPowerDbm<<"dbm, rxPower="<<rxPowerDbm<<"dbm, "<<

                        "distance="<<senderMobility->GetDistanceFrom (receiverMobility)<<"m, delay="<<delay);

          Ptr<Packet> copy = packet->Copy ();

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

                               j, copy, rxPowerDbm, wifiMode, preamble);

        }

      j++;

    }

}

void

WifiChannel::Receive (uint32_t i, Ptr<Packet> packet, double rxPowerDbm,

                      WifiMode txMode, WifiPreamble preamble) const

{

  m_deviceList[i].second->StartReceivePacket (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