/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * 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: Manuel Requena <manuel.requena@cttc.es>
 *         Nicola Baldo <nbaldo@cttc.es>
 */


#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/mobility-module.h"
#include "ns3/lte-module.h"
#include "ns3/config-store.h"
#include "ns3/radio-bearer-stats-calculator.h"

#include <iomanip>
#include <string>

using namespace ns3;

/**
 * This simulation script creates two eNodeBs and drops randomly several UEs in
 * a disc around them (same number on both). The number of UEs , the radius of
 * that disc and the distance between the eNodeBs can be configured.
 */
int main (int argc, char *argv[])
{
  double enbDist = 100.0;
  double radius = 50.0;
  uint32_t numUes = 1;


  CommandLine cmd;
  cmd.AddValue ("enbDist", "distance between the two eNBs", enbDist);
  cmd.AddValue ("radius", "the radius of the disc where UEs are placed around an eNB", radius);
  cmd.AddValue ("numUes", "how many UEs are attached to each eNB", numUes);
  cmd.Parse (argc, argv);

  ConfigStore inputConfig;
  inputConfig.ConfigureDefaults ();

  // parse again so you can override default values from the command line
  cmd.Parse (argc, argv);

  // determine the string tag that identifies this simulation run
  // this tag is then appended to all filenames

  IntegerValue runValue;
  GlobalValue::GetValueByName ("RngRun", runValue);

  std::ostringstream tag;
  tag  << "_enbDist" << std::setw (3) << std::setfill ('0') << std::fixed << std::setprecision (0) << enbDist
       << "_radius"  << std::setw (3) << std::setfill ('0') << std::fixed << std::setprecision (0) << radius
       << "_numUes"  << std::setw (3) << std::setfill ('0')  << numUes
       << "_rngRun"  << std::setw (3) << std::setfill ('0')  << runValue.Get () ;

  Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();
  
  lteHelper->SetAttribute ("PathlossModel", StringValue ("ns3::FriisSpectrumPropagationLossModel"));

  // Create Nodes: eNodeB and UE
  NodeContainer enbNodes;
  NodeContainer ueNodes1, ueNodes2;
  enbNodes.Create (2);
  ueNodes1.Create (numUes);
  ueNodes2.Create (numUes);

  // Position of eNBs
  Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();
  positionAlloc->Add (Vector (0.0, 0.0, 0.0));
  positionAlloc->Add (Vector (enbDist, 0.0, 0.0));
  MobilityHelper enbMobility;
  enbMobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  enbMobility.SetPositionAllocator (positionAlloc);
  enbMobility.Install (enbNodes);

  // Position of UEs attached to eNB 1
  MobilityHelper ue1mobility;
  ue1mobility.SetPositionAllocator ("ns3::UniformDiscPositionAllocator",
                                    "X", DoubleValue (0.0),
                                    "Y", DoubleValue (0.0),
                                    "rho", DoubleValue (radius));
  ue1mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  ue1mobility.Install (ueNodes1);

  // Position of UEs attached to eNB 2
  MobilityHelper ue2mobility;
  ue2mobility.SetPositionAllocator ("ns3::UniformDiscPositionAllocator",
                                    "X", DoubleValue (enbDist),
                                    "Y", DoubleValue (0.0),
                                    "rho", DoubleValue (radius));
  ue2mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  ue2mobility.Install (ueNodes2);



  // Create Devices and install them in the Nodes (eNB and UE)
  NetDeviceContainer enbDevs;
  NetDeviceContainer ueDevs1;
  NetDeviceContainer ueDevs2;
  enbDevs = lteHelper->InstallEnbDevice (enbNodes);
  ueDevs1 = lteHelper->InstallUeDevice (ueNodes1);
  ueDevs2 = lteHelper->InstallUeDevice (ueNodes2);

  // Attach UEs to a eNB
  lteHelper->Attach (ueDevs1, enbDevs.Get (0));
  lteHelper->Attach (ueDevs2, enbDevs.Get (1));

  // Activate an EPS bearer on all UEs
  enum EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;
  EpsBearer bearer (q);
  lteHelper->ActivateEpsBearer (ueDevs1, bearer, EpcTft::Default ());
  lteHelper->ActivateEpsBearer (ueDevs2, bearer, EpcTft::Default ());

  Simulator::Stop (Seconds (10));

  // Insert RLC Performance Calculator
  std::string dlOutFname = "DlRlcStats";
  dlOutFname.append (tag.str ());
  std::string ulOutFname = "UlRlcStats";
  ulOutFname.append (tag.str ());

  lteHelper->EnableMacTraces ();
  lteHelper->EnableRlcTraces ();

  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}
