/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008-2009 Strasbourg University
 *
 * 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: David Gross <gdavid.devel@gmail.com>
 *         Sebastien Vincent <vincent@clarinet.u-strasbg.fr>
 */

// Network topology
// //
// //             n0   r    n1
// //             |    _    |
// //             ====|_|====
// //                router
// //
// // - Tracing of queues and packet receptions to file "fragmentation-ipv6.tr"

#include <fstream>
#include "ns3/core-module.h"
#include "ns3/internet-module.h"
#include "ns3/csma-module.h"
#include "ns3/applications-module.h"
#include "ns3/ipv6-static-routing-helper.h"

#include "ns3/ipv6-routing-table-entry.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("FragmentationIpv6Example");

/**
 * \class StackHelper
 * \brief Helper to set or get some IPv6 information about nodes.
 */
class StackHelper
{
public:
  /**
   * \brief Add an address to a IPv6 node.
   * \param n node
   * \param interface interface index
   * \param address IPv6 address to add
   */
  inline void AddAddress (Ptr<Node>& n, uint32_t interface, Ipv6Address address)
  {
    Ptr<Ipv6> ipv6 = n->GetObject<Ipv6> ();
    ipv6->AddAddress (interface, address);
  }

  /**
   * \brief Print the routing table.
   * \param n the node
   */
  inline void PrintRoutingTable (Ptr<Node>& n)
  {
    Ptr<Ipv6StaticRouting> routing = 0;
    Ipv6StaticRoutingHelper routingHelper;
    Ptr<Ipv6> ipv6 = n->GetObject<Ipv6> ();
    uint32_t nbRoutes = 0;
    Ipv6RoutingTableEntry route;

    routing = routingHelper.GetStaticRouting (ipv6);

    std::cout << "Routing table of " << n << " : " << std::endl;
    std::cout << "Destination\t\t\t\t" << "Gateway\t\t\t\t\t" << "Interface\t" <<  "Prefix to use" << std::endl;

    nbRoutes = routing->GetNRoutes ();
    for (uint32_t i = 0; i < nbRoutes; i++)
      {
        route = routing->GetRoute (i);
        std::cout << route.GetDest () << "\t"
                  << route.GetGateway () << "\t"
                  << route.GetInterface () << "\t"
                  << route.GetPrefixToUse () << "\t"
                  << std::endl;
      }
  } 
};

int main (int argc, char** argv)
{
#if 0 
  LogComponentEnable ("Ipv6L3Protocol", LOG_LEVEL_ALL);
  LogComponentEnable ("Icmpv6L4Protocol", LOG_LEVEL_ALL);
  LogComponentEnable ("Ipv6StaticRouting", LOG_LEVEL_ALL);
  LogComponentEnable ("Ipv6Interface", LOG_LEVEL_ALL);
  LogComponentEnable ("Ping6Application", LOG_LEVEL_ALL);
#endif

  CommandLine cmd;
  cmd.Parse (argc, argv);

  StackHelper stackHelper;

  NS_LOG_INFO ("Create nodes.");
  Ptr<Node> n0 = CreateObject<Node> ();
  Ptr<Node> r = CreateObject<Node> ();
  Ptr<Node> n1 = CreateObject<Node> ();

  NodeContainer net1 (n0, r);
  NodeContainer net2 (r, n1);
  NodeContainer all (n0, r, n1);

  NS_LOG_INFO ("Create IPv6 Internet Stack");
  InternetStackHelper internetv6;
  internetv6.Install (all);

  NS_LOG_INFO ("Create channels.");
  CsmaHelper csma;
  csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
  NetDeviceContainer d1 = csma.Install (net1);
  NetDeviceContainer d2 = csma.Install (net2);

  NS_LOG_INFO ("Create networks and assign IPv6 Addresses.");
  Ipv6AddressHelper ipv6;
  ipv6.SetBase (Ipv6Address ("2001:1::"), Ipv6Prefix (64));
  Ipv6InterfaceContainer i1 = ipv6.Assign (d1);
  i1.SetForwarding (1, true);
  i1.SetDefaultRouteInAllNodes (1);
  ipv6.SetBase (Ipv6Address ("2001:2::"), Ipv6Prefix (64));
  Ipv6InterfaceContainer i2 = ipv6.Assign (d2);
  i2.SetForwarding (0, true);
  i2.SetDefaultRouteInAllNodes (0);

  stackHelper.PrintRoutingTable (n0);

  /* Create a Ping6 application to send ICMPv6 echo request from n0 to n1 via r */
  uint32_t packetSize = 4096;
  uint32_t maxPacketCount = 5;
  Time interPacketInterval = Seconds (1.0);
  Ping6Helper ping6;

  ping6.SetLocal (i1.GetAddress (0, 1));
  ping6.SetRemote (i2.GetAddress (1, 1)); 

  ping6.SetAttribute ("MaxPackets", UintegerValue (maxPacketCount));
  ping6.SetAttribute ("Interval", TimeValue (interPacketInterval));
  ping6.SetAttribute ("PacketSize", UintegerValue (packetSize));
  ApplicationContainer apps = ping6.Install (net1.Get (0));
  apps.Start (Seconds (2.0));
  apps.Stop (Seconds (20.0));

  AsciiTraceHelper ascii;
  csma.EnableAsciiAll (ascii.CreateFileStream ("fragmentation-ipv6.tr"));
  csma.EnablePcapAll (std::string ("fragmentation-ipv6"), true);

  NS_LOG_INFO ("Run Simulation.");
  Simulator::Run ();
  Simulator::Destroy ();
  NS_LOG_INFO ("Done.");
}