/* -*-  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"

#include "ns3/pointer.h"

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (HierarchicalMobilityModel);

TypeId 

HierarchicalMobilityModel::GetTypeId (void)

{

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

    .SetParent<MobilityModel> ()

    .AddConstructor<HierarchicalMobilityModel> ()

    .AddAttribute ("Child", "The child mobility model.",

                   MakePointerAccessor (&HierarchicalMobilityModel::SetChild),

                   MakePointerChecker<MobilityModel> ())

    .AddAttribute ("Parent", "The parent mobility model.",

                   MakePointerAccessor (&HierarchicalMobilityModel::SetParent),

                   MakePointerChecker<MobilityModel> ())

    ;

  return tid;

}

HierarchicalMobilityModel::HierarchicalMobilityModel ()

  : m_child (0),

    m_parent (0)

{}

void 

HierarchicalMobilityModel::SetChild (Ptr<MobilityModel> model)

{

  m_child = model;

  Ptr<MobilityModelNotifier> notifier = 

    m_child->GetObject<MobilityModelNotifier> ();

  if (notifier == 0)

    {

      notifier = CreateObject<MobilityModelNotifier> ();

      m_child->AggregateObject (notifier);

    }

  notifier->TraceConnectWithoutContext ("CourseChange", MakeCallback (&HierarchicalMobilityModel::ChildChanged, this));

}

void 

HierarchicalMobilityModel::SetParent (Ptr<MobilityModel> model)

{

  m_parent = model;

  Ptr<MobilityModelNotifier> notifier = 

    m_parent->GetObject<MobilityModelNotifier> ();

  if (notifier == 0)

    {

      notifier = CreateObject<MobilityModelNotifier> ();

      m_parent->AggregateObject (notifier);

    }

  notifier->TraceConnectWithoutContext ("CourseChange", 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)

{

  if (m_parent == 0 || m_child == 0)

    {

      return;

    }

  // 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 (Ptr<const MobilityModel> model)

{

  MobilityModel::NotifyCourseChange ();

}

void 

HierarchicalMobilityModel::ChildChanged (Ptr<const MobilityModel> model)

{

  MobilityModel::NotifyCourseChange ();

}

} // namespace ns3