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

/*

 * Copyright (c) 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 "hierarchical-mobility-model.h"

#include "mobility-model-notifier.h"

namespace ns3 {

HierarchicalMobilityModel::HierarchicalMobilityModel (Ptr<MobilityModel> child, Ptr<MobilityModel> parent)

  : m_child (child),

    m_parent (parent)

{

  Ptr<MobilityModelNotifier> childNotifier = 

  Ptr<MobilityModelNotifier> parentNotifier = 

  if (childNotifier == 0)

    {

      childNotifier = CreateObject<MobilityModelNotifier> ();

      child->AddInterface (childNotifier);

    }

  if (parentNotifier == 0)

    {

      parentNotifier = CreateObject<MobilityModelNotifier> ();

      parent->AddInterface (parentNotifier);

    }

  childNotifier->TraceConnect ("/course-changed", MakeCallback (&HierarchicalMobilityModel::ChildChanged, this));

  parentNotifier->TraceConnect ("/course-changed", MakeCallback (&HierarchicalMobilityModel::ParentChanged, this));

}

Ptr<MobilityModel> 

HierarchicalMobilityModel::GetChild (void) const

{

  return m_child;

}

Ptr<MobilityModel> 

HierarchicalMobilityModel::GetParent (void) const

{

  return m_parent;

}

Vector

HierarchicalMobilityModel::DoGetPosition (void) const

{

  Vector parentPosition = m_parent->GetPosition ();

  Vector childPosition = m_child->GetPosition ();

  return Vector (parentPosition.x + childPosition.x,

		   parentPosition.y + childPosition.y,

		   parentPosition.z + childPosition.z);

}

void 

HierarchicalMobilityModel::DoSetPosition (const Vector &position)

{

  // This implementation of DoSetPosition is really an arbitraty choice.

  // anything else would have been ok.

  Vector parentPosition = m_parent->GetPosition ();

  Vector childPosition (position.x - parentPosition.x,

			  position.y - parentPosition.y,

			  position.z - parentPosition.z);

  m_child->SetPosition (childPosition);

}

Vector

HierarchicalMobilityModel::DoGetVelocity (void) const

{

  Vector parentSpeed = m_parent->GetVelocity ();

  Vector childSpeed = m_child->GetVelocity ();

  Vector speed (parentSpeed.x + childSpeed.x,

               parentSpeed.y + childSpeed.y,

               parentSpeed.z + childSpeed.z);

  return speed;

}

void 

HierarchicalMobilityModel::ParentChanged (const TraceContext &context, Ptr<const MobilityModel> model)

{

  MobilityModel::NotifyCourseChange ();

}

void 

HierarchicalMobilityModel::ChildChanged (const TraceContext &context, Ptr<const MobilityModel> model)

{

  MobilityModel::NotifyCourseChange ();

}

} // namespace ns3