/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2011 University of California, Los Angeles
 *
 * 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: Ilya Moiseenko <iliamo@cs.ucla.edu>
 */

#include "annotated-topology-reader.h"

#include "ns3/nstime.h"
#include "ns3/log.h"
#include "ns3/assert.h"
#include "ns3/names.h"
#include "ns3/net-device-container.h"
#include "ns3/point-to-point-helper.h"
#include "ns3/point-to-point-net-device.h"
#include "ns3/internet-stack-helper.h"
#include "ns3/ipv4-address-helper.h"
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/drop-tail-queue.h"
#include "ns3/ipv4-interface.h"
#include "ns3/ipv4.h"
#include "ns3/string.h"
#include "ns3/pointer.h"
#include "ns3/uinteger.h"
#include "ns3/ipv4-address.h"

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

#include <boost/foreach.hpp>
#include <boost/lexical_cast.hpp>

#include <set>

using namespace std;

namespace ns3 
{    

NS_LOG_COMPONENT_DEFINE ("AnnotatedTopologyReader");
    
AnnotatedTopologyReader::AnnotatedTopologyReader (const std::string &path)
  : m_path (path)
  , m_randX (0, 100.0)
  , m_randY (0, 100.0)
{
  NS_LOG_FUNCTION (this);

  SetMobilityModel ("ns3::ConstantPositionMobilityModel");
}
    
void
AnnotatedTopologyReader::SetBoundingBox (double ulx, double uly, double lrx, double lry)
{
  NS_LOG_FUNCTION (this << ulx << uly << lrx << lry);
  
  m_randX = UniformVariable (ulx, lrx);
  m_randY = UniformVariable (uly, lry);
}

void
AnnotatedTopologyReader::SetMobilityModel (const std::string &model)
{
  NS_LOG_FUNCTION (this << model);
  m_mobilityFactory.SetTypeId (model);
}

AnnotatedTopologyReader::~AnnotatedTopologyReader ()
{
  NS_LOG_FUNCTION (this);
}

Ptr<Node>
AnnotatedTopologyReader::CreateNode (const std::string name)
{
  return CreateNode (name, m_randX.GetValue (), m_randY.GetValue ());
}

Ptr<Node>
AnnotatedTopologyReader::CreateNode (const std::string name, double posX, double posY)
{
  NS_LOG_FUNCTION (this << name << posX << posY);
  Ptr<Node> node = CreateObject<Node> ();
  Ptr<MobilityModel> loc = DynamicCast<MobilityModel> (m_mobilityFactory.Create ());
  node->AggregateObject (loc);

  loc->SetPosition (Vector (posX, posY, 0));

  Names::Add (m_path, name, node);

  return node;
}

NodeContainer
AnnotatedTopologyReader::Read (void)
{
  ifstream topgen;
  topgen.open (GetFileName ().c_str ());
  NodeContainer nodes;
        
  if ( !topgen.is_open () )
    {
      NS_LOG_ERROR ("Cannot open file " << GetFileName () << " for reading");
      return nodes;
    }

  while (!topgen.eof ())
    {
      string line;
      getline (topgen, line);

      if (line == "router") break;
    }

  while (!topgen.eof ())
    {
      string line;
      getline (topgen,line);
      if (line[0] == '#') continue; // comments
      if (line=="link") break; // stop reading nodes
      
      istringstream lineBuffer (line);
      string name, city;
      double latitude, longitude;

      lineBuffer >> name >> city >> latitude >> longitude;
      Ptr<Node> node = CreateNode (name, longitude, -latitude);
      nodes.Add (node);
    }

  map<string, set<string> > processedLinks; // to eliminate duplications
  
  // SeekToSection ("link"); 
  while (!topgen.eof ())
    {
      string line;
      getline (topgen,line);
      if (line == "") continue;
      if (line[0] == '#') continue; // comments

      // NS_LOG_DEBUG ("Input: [" << line << "]");
      
      istringstream lineBuffer (line);
      string from, to, capacity, metric, delay, maxPackets;

      lineBuffer >> from >> to >> capacity >> metric >> delay >> maxPackets;

      if (processedLinks[to].size () != 0 &&
          processedLinks[to].find (from) != processedLinks[to].end ())
        {
          continue; // duplicated link
        }
      processedLinks[from].insert (to);
      
      Ptr<Node> fromNode = Names::Find<Node> (m_path, from);
      NS_ASSERT (fromNode != 0);
      Ptr<Node> toNode   = Names::Find<Node> (m_path, to);
      NS_ASSERT (fromNode != 0);

      Link link (fromNode, from, toNode, to);
      
      link.SetAttribute ("DataRate", capacity);
      link.SetAttribute ("OSPF", metric);

      if (!delay.empty ())
          link.SetAttribute ("Delay", delay);
      if (!maxPackets.empty ())
        link.SetAttribute ("MaxPackets", maxPackets);

      AddLink (link);
      NS_LOG_DEBUG ("New link " << from << " <==> " << to << " / " << capacity << " with " << metric << " metric (" << delay << ", " << maxPackets << ")");
    }
        
  NS_LOG_INFO ("Annotated topology created with " << nodes.GetN () << " nodes and " << LinksSize () << " links");
  topgen.close ();
        
  ApplySettings ();
  
  return nodes;
}
    
void
AnnotatedTopologyReader::AssignIpv4Addresses (Ipv4Address base)
{
  Ipv4AddressHelper address (base, Ipv4Mask ("/24"));
    
  BOOST_FOREACH (const Link &link, m_linksList)
    {
      address.Assign (NetDeviceContainer (link.GetFromNetDevice (),
                                          link.GetToNetDevice ()));
        
      base = Ipv4Address (base.Get () + 256);
      address.SetBase (base, Ipv4Mask ("/24"));
    }
        
  ApplyOspfMetric ();
}
        
void
AnnotatedTopologyReader::ApplyOspfMetric ()
{
  BOOST_FOREACH (const Link &link, m_linksList)
    {
      NS_LOG_DEBUG ("OSPF: " << link.GetAttribute ("OSPF"));
      uint16_t metric = boost::lexical_cast<uint16_t> (link.GetAttribute ("OSPF"));
        
      {
        Ptr<Ipv4> ipv4 = link.GetFromNode ()->GetObject<Ipv4> ();
        NS_ASSERT (ipv4 != 0);
        
        int32_t interfaceId = ipv4->GetInterfaceForDevice (link.GetFromNetDevice ());
        NS_ASSERT (interfaceId >= 0);
        
        ipv4->SetMetric (interfaceId,metric);
      }
        
      {
        Ptr<Ipv4> ipv4 = link.GetToNode ()->GetObject<Ipv4> ();
        NS_ASSERT (ipv4 != 0);
        
        int32_t interfaceId = ipv4->GetInterfaceForDevice (link.GetToNetDevice ());
        NS_ASSERT (interfaceId >= 0);

        ipv4->SetMetric (interfaceId,metric);
      }
    }
}

void
AnnotatedTopologyReader::ApplySettings ()
{
  PointToPointHelper p2p;

  BOOST_FOREACH (Link &link, m_linksList)
    {
      string tmp;

      if (link.GetAttributeFailSafe ("DataRate", tmp))
        {
          NS_LOG_INFO ("DataRate = " + link.GetAttribute("DataRate"));
          p2p.SetDeviceAttribute ("DataRate", StringValue (link.GetAttribute ("DataRate")));
        }

      if (link.GetAttributeFailSafe ("Delay", tmp))
        {
          NS_LOG_INFO ("Delay = " + link.GetAttribute("Delay"));
          p2p.SetChannelAttribute ("Delay", StringValue (link.GetAttribute ("Delay")));
        }

      NetDeviceContainer nd = p2p.Install(link.GetFromNode (), link.GetToNode ());
      link.SetNetDevices (nd.Get (0), nd.Get (1));

      if (link.GetAttributeFailSafe ("MaxPackets", tmp))
        {
          NS_LOG_INFO ("MaxPackets = " + link.GetAttribute ("MaxPackets"));

          PointerValue txQueue;

          link.GetToNetDevice ()->GetAttribute ("TxQueue", txQueue);
          NS_ASSERT (txQueue.Get<DropTailQueue> () != 0);       
          txQueue.Get<DropTailQueue> ()->SetAttribute ("MaxPackets", StringValue (link.GetAttribute ("MaxPackets")));

          link.GetFromNetDevice ()->GetAttribute ("TxQueue", txQueue);
          NS_ASSERT (txQueue.Get<DropTailQueue> () != 0);
          txQueue.Get<DropTailQueue> ()->SetAttribute ("MaxPackets", StringValue (link.GetAttribute ("MaxPackets")));
        }
        
    }
}

}