/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/SimMuon/Neutron/src/SubsystemNeutronWriter.cc

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#include "SimMuon/Neutron/interface/SubsystemNeutronWriter.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "SimMuon/Neutron/src/AsciiNeutronWriter.h"
#include "SimMuon/Neutron/src/RootNeutronWriter.h"
#include "SimMuon/Neutron/src/NeutronWriter.h"
#include "SimMuon/Neutron/src/EDMNeutronWriter.h"
#include "CLHEP/Random/RandomEngine.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"

#include <algorithm>

using namespace std;

class SortByTime {
public:
  bool operator()(const PSimHit & h1, const PSimHit & h2) {
   return (h1.tof() < h2.tof());
  }
};


SubsystemNeutronWriter::SubsystemNeutronWriter(edm::ParameterSet const& pset) 
: theHitWriter(0),
  theRandFlat(0),
  theInputTag(pset.getParameter<edm::InputTag>("input")),
  theNeutronTimeCut(pset.getParameter<double>("neutronTimeCut")),
  theTimeWindow(pset.getParameter<double>("timeWindow")),
  theT0(pset.getParameter<double>("t0")),
  theNEvents(0),
  initialized(false),
  useLocalDetId_(true)
{
  string writer = pset.getParameter<string>("writer");
  string output = pset.getParameter<string>("output");
  if(writer == "ASCII")
  {
    theHitWriter = new AsciiNeutronWriter(output);
  }
  else if (writer == "ROOT")
  {
    theHitWriter = new RootNeutronWriter(output);
  }
  else if (writer == "EDM")
  {
    produces<edm::PSimHitContainer>();
    theHitWriter = new EDMNeutronWriter();
    // write out the real DetId, not the local one
    useLocalDetId_ = false;
    // smear the times
    edm::Service<edm::RandomNumberGenerator> rng;
    if ( ! rng.isAvailable()) {
     throw cms::Exception("Configuration")
       << "SubsystemNeutronWriter requires the RandomNumberGeneratorService\n"
          "which is not present in the configuration file.  You must add the service\n"
          "in the configuration file or remove the modules that require it.";
    }
    CLHEP::HepRandomEngine& engine = rng->getEngine();
    theRandFlat = new CLHEP::RandFlat(engine);
  }
  else 
  {
    throw cms::Exception("NeutronWriter") << "Bad writer: "
      << writer;
  } 
}


SubsystemNeutronWriter::~SubsystemNeutronWriter()
{
  printStats();
  delete theHitWriter;
  delete theRandFlat;
}



void SubsystemNeutronWriter::printStats() {
  edm::LogInfo("SubsystemNeutronWriter") << "SubsystemNeutronWriter Statistics:\n";
  for(map<int,int>::iterator mapItr = theCountPerChamberType.begin();
      mapItr != theCountPerChamberType.end();  ++mapItr) {
     edm::LogInfo("SubsystemNeutronWriter") << "   theEventOccupancy[" << mapItr->first << "] = "
         << mapItr->second << " / " << theNEvents << " / NCT \n";
  }
}


void SubsystemNeutronWriter::produce(edm::Event & e, edm::EventSetup const& c)
{
  theHitWriter->beginEvent(e,c);
  ++theNEvents;
  edm::Handle<edm::PSimHitContainer> hits;
  e.getByLabel(theInputTag, hits);

  // sort hits by chamber
  map<int, edm::PSimHitContainer> hitsByChamber;
  for(edm::PSimHitContainer::const_iterator hitItr = hits->begin();
      hitItr != hits->end(); ++hitItr)
  {
    int chamberIndex = chamberId(hitItr->detUnitId());
    hitsByChamber[chamberIndex].push_back(*hitItr);
  }

  // now write out each chamber's contents
  for(map<int, edm::PSimHitContainer>::iterator hitsByChamberItr = hitsByChamber.begin();
      hitsByChamberItr != hitsByChamber.end(); ++hitsByChamberItr)
  {
    int chambertype = chamberType(hitsByChamberItr->first);
    writeHits(chambertype, hitsByChamberItr->second);
  }
  theHitWriter->endEvent();
}


void SubsystemNeutronWriter::initialize(int chamberType)
{
  // should instantiate one of every chamber type, just so
  // ROOT knows what file to associate them with
  theHitWriter->initialize(chamberType);
}


void SubsystemNeutronWriter::writeHits(int chamberType, edm::PSimHitContainer & chamberHits)
{

  sort(chamberHits.begin(), chamberHits.end(), SortByTime());
  edm::PSimHitContainer cluster;
  float startTime = -1000.;
  float smearing = 0.;
  for(size_t i = 0; i < chamberHits.size(); ++i) {
    PSimHit hit = chamberHits[i];
    float tof = hit.tof();
    LogDebug("SubsystemNeutronWriter") << "found hit from part type " << hit.particleType()
                   << " at tof " << tof << " p " << hit.pabs() 
                   << " on det " << hit.detUnitId() 
                   << " chamber type " << chamberType;
    if(tof > theNeutronTimeCut) {
      if(tof > (startTime + theTimeWindow) ) { // 1st in cluster
        startTime = tof;
        // set the time to be [t0, t0+25] at start of event
        smearing = theT0;
        if(theRandFlat) {
          smearing += theRandFlat->fire(25.);
        }
        if(!cluster.empty()) {
          LogDebug("SubsystemNeutronWriter") << "filling old cluster";
          writeCluster(chamberType, cluster);
          cluster.clear();
        }
        LogDebug("SubsystemNeutronWriter") << "starting neutron cluster at time " << startTime 
          << " on detType " << chamberType;
      }
      adjust(hit, -1.*startTime, smearing);
      cluster.push_back( hit );
    }
  }
  // get any leftover cluster
  if(!cluster.empty()) {
    writeCluster(chamberType, cluster);
  }
}


void SubsystemNeutronWriter::writeCluster(int chamberType, const edm::PSimHitContainer & cluster)
{
  if(accept(cluster))
  {
    theHitWriter->writeCluster(chamberType, cluster);
    updateCount(chamberType);
  }
}


void SubsystemNeutronWriter::adjust(PSimHit & h, float timeOffset, float smearing) {
  unsigned int detId = useLocalDetId_ ? localDetId(h.detUnitId()) : h.detUnitId();
  float htime = h.timeOfFlight() + timeOffset + smearing;
  // prevent float precision loss
  if (h.timeOfFlight() > 1.E+6) {
    htime = smearing;
  }
  h = PSimHit( h.entryPoint(), h.exitPoint(), h.pabs(), htime,
               h.energyLoss(), h.particleType(), 
               detId, h.trackId(),
               h.momentumAtEntry().theta(),
               h.momentumAtEntry().phi() );
}


void SubsystemNeutronWriter::updateCount(int chamberType) {
  map<int,int>::iterator entry = theCountPerChamberType.find(chamberType);
  if(entry == theCountPerChamberType.end()) {
    theCountPerChamberType.insert( pair<int,int>(chamberType, 1) );
  } else {
    ++(entry->second);
  }
}