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

/*

 * 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

 */

#include <iostream>

#include <sstream>

// ns3 includes

#include "ns3/log.h"

#include "ns3/point-to-point-star.h"

#include "ns3/constant-position-mobility-model.h"

#include "ns3/node-list.h"

#include "ns3/point-to-point-net-device.h"

#include "ns3/vector.h"

#include "ns3/ipv6-address-generator.h"

NS_LOG_COMPONENT_DEFINE ("PointToPointStarHelper");

namespace ns3 {

PointToPointStarHelper::PointToPointStarHelper (uint32_t numSpokes,

                                                PointToPointHelper p2pHelper)

{

  m_hub.Create (1);

  m_spokes.Create (numSpokes);

  for (uint32_t i = 0; i < m_spokes.GetN (); ++i)

    {

      NetDeviceContainer nd = p2pHelper.Install (m_hub.Get (0), m_spokes.Get (i));

      m_hubDevices.Add (nd.Get (0));

      m_spokeDevices.Add (nd.Get (1));

    }

}

PointToPointStarHelper::~PointToPointStarHelper ()

{

}

Ptr<Node>

PointToPointStarHelper::GetHub () const

{

  return m_hub.Get (0);

}

Ptr<Node>

PointToPointStarHelper::GetSpokeNode (uint32_t i) const

{

  return m_spokes.Get (i);

}

Ipv4Address

PointToPointStarHelper::GetHubIpv4Address (uint32_t i) const

{

  return m_hubInterfaces.GetAddress (i);

}

Ipv4Address

PointToPointStarHelper::GetSpokeIpv4Address (uint32_t i) const

{

  return m_spokeInterfaces.GetAddress (i);

}

Ipv6Address

PointToPointStarHelper::GetHubIpv6Address (uint32_t i) const

{

  return m_hubInterfaces6.GetAddress (i, 1);

}

Ipv6Address

PointToPointStarHelper::GetSpokeIpv6Address (uint32_t i) const

{

  return m_spokeInterfaces6.GetAddress (i, 1);

}

uint32_t

PointToPointStarHelper::SpokeCount () const

{

  return m_spokes.GetN ();

}

void 

PointToPointStarHelper::InstallStack (InternetStackHelper stack)

{

  stack.Install (m_hub);

  stack.Install (m_spokes);

}

void 

PointToPointStarHelper::AssignIpv4Addresses (Ipv4AddressHelper address)

{

  for (uint32_t i = 0; i < m_spokes.GetN (); ++i)

    {

      m_hubInterfaces.Add (address.Assign (m_hubDevices.Get (i)));

      m_spokeInterfaces.Add (address.Assign (m_spokeDevices.Get (i)));

      address.NewNetwork ();

    }

}

void 

PointToPointStarHelper::AssignIpv6Addresses (Ipv6Address addrBase, Ipv6Prefix prefix)

{

  Ipv6AddressGenerator::Init (addrBase, prefix);

  Ipv6Address v6network;

  Ipv6AddressHelper addressHelper;

  for (uint32_t i = 0; i < m_spokes.GetN (); ++i)

    {

      v6network = Ipv6AddressGenerator::GetNetwork (prefix);

      Ipv6InterfaceContainer ic = addressHelper.Assign (m_hubDevices.Get (i));

      m_hubInterfaces6.Add (ic);

      ic = addressHelper.Assign (m_spokeDevices.Get (i));

      m_spokeInterfaces6.Add (ic);

      Ipv6AddressGenerator::NextNetwork (prefix);

    }

}

void 

PointToPointStarHelper::BoundingBox (double ulx, double uly,

                                     double lrx, double lry)

{

  double xDist;

  double yDist;

  if (lrx > ulx)

    {

      xDist = lrx - ulx;

    }

  else

    {

      xDist = ulx - lrx;

    }

  if (lry > uly)

    {

      yDist = lry - uly;

    }

  else

    {

      yDist = uly - lry;

    }

  // Place the hub

  Ptr<Node> hub = m_hub.Get (0);

  Ptr<ConstantPositionMobilityModel> hubLoc =  hub->GetObject<ConstantPositionMobilityModel> ();

  if (hubLoc == 0)

    {

      hubLoc = CreateObject<ConstantPositionMobilityModel> ();

      hub->AggregateObject (hubLoc);

    }

  Vector hubVec (ulx + xDist/2.0, uly + yDist/2.0, 0);

  hubLoc->SetPosition (hubVec);

  double spokeDist;

  if (xDist > yDist)

    {

      spokeDist = yDist/4.0;

    }

  else

    {

      spokeDist = xDist/4.0;

    }

  double theta = 2*M_PI/m_spokes.GetN ();

  for (uint32_t i = 0; i < m_spokes.GetN (); ++i)

    {

      Ptr<Node> spokeNode = m_spokes.Get (i);

      Ptr<ConstantPositionMobilityModel> spokeLoc = spokeNode->GetObject<ConstantPositionMobilityModel> ();

      if (spokeLoc == 0)

        {

          spokeLoc = CreateObject<ConstantPositionMobilityModel> ();

          spokeNode->AggregateObject (spokeLoc);

        }

      Vector spokeVec (hubVec.x + cos (theta*i) * spokeDist,

                       hubVec.y + sin (theta*i) * spokeDist,

                       0);

      spokeLoc->SetPosition (spokeVec);

    }

}

} // namespace ns3