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

/*

 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)

 *

 * 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: Marco Miozzo  <marco.miozzo@cttc.es>

 * 

 */

#include "ns3/propagation-loss-model.h"

#include "ns3/log.h"

#include "ns3/mobility-model.h"

#include "ns3/double.h"

#include "ns3/pointer.h"

#include <math.h>

#include "hybrid-buildings-propagation-loss-model.h"

#include "ns3/buildings-mobility-model.h"

#include "ns3/enum.h"

NS_LOG_COMPONENT_DEFINE ("HybridBuildingsPropagationLossModel");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (HybridBuildingsPropagationLossModel);

HybridBuildingsPropagationLossModel::HybridBuildingsPropagationLossModel ()

  : BuildingsPropagationLossModel ()

{

}

HybridBuildingsPropagationLossModel::~HybridBuildingsPropagationLossModel ()

{

}

TypeId

HybridBuildingsPropagationLossModel::GetTypeId (void)

{

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

  .SetParent<BuildingsPropagationLossModel> ()

  .AddConstructor<HybridBuildingsPropagationLossModel> ();

  return tid;

}

double

HybridBuildingsPropagationLossModel::GetLoss (Ptr<MobilityModel> a, Ptr<MobilityModel> b) const

{

  NS_ASSERT_MSG ((a->GetPosition ().z > 0) && (b->GetPosition ().z > 0), "HybridBuildingsPropagationLossModel does not support underground nodes (placed at z < 0)");

  double distance = a->GetDistanceFrom (b);

  if (distance <= m_minDistance)

    {

      return 0.0;

    }

  // get the BuildingsMobilityModel pointers

  Ptr<BuildingsMobilityModel> a1 = DynamicCast<BuildingsMobilityModel> (a);

  Ptr<BuildingsMobilityModel> b1 = DynamicCast<BuildingsMobilityModel> (b);

  NS_ASSERT_MSG ((a1 != 0) && (b1 != 0), "HybridBuildingsPropagationLossModel only works with BuildingsMobilityModel");

  double loss = 0.0;

  if (a1->IsOutdoor ())

    {

      if (b1->IsOutdoor ())

        {

          if (distance > 1000)

            {

              NS_LOG_INFO (this << a1->GetPosition ().z << b1->GetPosition ().z << m_rooftopHeight);

              if ((a1->GetPosition ().z < m_rooftopHeight)

                  && (b1->GetPosition ().z < m_rooftopHeight))

                {

                  // ITU limit in distance (i.e., < 2000 for small cells)

                  if (distance < m_itu1411DistanceThreshold)

                    {

                      // short range communication

                      loss = ItuR1411 (a1, b1);

                      NS_LOG_INFO (this << " 0-0 (>1000): down rooftop -> ITUR1411 : " << loss);

                    }

                  else

                    {

                      // out of bound

                      loss = std::numeric_limits<double>::infinity ();

                      NS_LOG_INFO (this << " 0-0 (>2000): down rooftop -> Infinity (out of bound) : " << loss);

                    }

                }

              else

                {

                  // Over the rooftop tranmission -> Okumura Hata

                  loss = OkumuraHata (a1, b1);

                  NS_LOG_INFO (this << " O-O (>1000): Over the rooftop -> OH : " << loss);

                }

            }

          else

            {

              // short range outdoor communication

              loss = ItuR1411 (a1, b1);

              NS_LOG_INFO (this << " 0-0 (<1000) Street canyon -> ITUR1411 : " << loss);

            }

        }

      else

        {

          // b indoor

          if (distance > 1000)

            {

              if ((a1->GetPosition ().z < m_rooftopHeight)

                  && (b1->GetPosition ().z < m_rooftopHeight))

                {

                  // ITU limit in distance (i.e., < 2000 for small cells)

                  if (distance < m_itu1411DistanceThreshold)

                    {

                      // short range communication

                      loss = ItuR1411 (a1, b1) + ExternalWallLoss (b1) + HeightLoss (a1);

                      NS_LOG_INFO (this << " 0-I (>1000): down rooftop -> ITUR1411 : " << loss);

                    }

                  else

                    {

                      // out of bound

                      loss = std::numeric_limits<double>::infinity ();

                      NS_LOG_INFO (this << " 0-I (>2000): down rooftop -> ITUR1411 : " << loss);

                    }

                }

              else

                {

                  // Over the rooftop tranmission -> Okumura Hata

                  loss = OkumuraHata (a1, b1) + ExternalWallLoss (b1);

                  NS_LOG_INFO (this << " O-I (>1000): Over the rooftop -> OH : " << loss);

                }

            }

          else

            {

              loss = ItuR1411 (a1, b1) + ExternalWallLoss (b1) + HeightLoss (b1);

              NS_LOG_INFO (this << " 0-I (<1000) ITUR1411 + BEL : " << loss);

            }

        } // end b1->isIndoor ()

    }

  else

    {

      // a is indoor

      if (b1->IsIndoor ())

        {

          if (a1->GetBuilding () == b1->GetBuilding ())

            {

              // nodes are in same building -> indoor communication ITU-R P.1238

              loss = ItuR1238 (a1, b1) + InternalWallsLoss (a1, b1);;

              NS_LOG_INFO (this << " I-I (same building) ITUR1238 : " << loss);

            }

          else

            {

              // nodes are in different buildings

              loss = ItuR1411 (a1, b1) + ExternalWallLoss (a1) + ExternalWallLoss (b1);

              NS_LOG_INFO (this << " I-I (different) ITUR1238 + 2*BEL : " << loss);

            }

        }

      else

        {

          // b is outdoor

          if (distance > 1000)

            {

              if ((a1->GetPosition ().z < m_rooftopHeight)

                  && (b1->GetPosition ().z < m_rooftopHeight))

                {

                  // ITU limit in distance (i.e., < 2000 for small cells)

                  if (distance < m_itu1411DistanceThreshold)

                    {

                      // short range communication

                      loss = ItuR1411 (a1, b1) + ExternalWallLoss (a1) + HeightLoss (a1);

                      NS_LOG_INFO (this << " I-O (>1000): down rooftop -> ITUR1411 : " << loss);

                    }

                  else

                    {

                      // out of bound

                      loss = std::numeric_limits<double>::infinity ();

                      NS_LOG_INFO (this << " I-O (>2000): down rooftop -> ITUR1411 : " << loss);

                    }

                }

              else

                {

                  // above rooftop -> OH

                  loss = OkumuraHata (a1, b1) + ExternalWallLoss (a1) + HeightLoss (a1);

                  NS_LOG_INFO (this << " =I-O (>1000) over rooftop OH + BEL + HG: " << loss);

                }

            }

          else

            {

              loss = ItuR1411 (a1, b1) + ExternalWallLoss (a1)  + HeightLoss (a1);

              NS_LOG_INFO (this << " I-O (<1000)  ITUR1411 + BEL + HG: " << loss);

            }

        } // end b1->IsIndoor ()

    } // end a1->IsOutdoor ()

  return loss;

}

} // namespace ns3