/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/SimMuon/RPCDigitizer/src/RPCSimAverageNoise.cc

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#include "Geometry/RPCGeometry/interface/RPCRoll.h"
#include "Geometry/RPCGeometry/interface/RPCRollSpecs.h"
#include "SimMuon/RPCDigitizer/src/RPCSimAverageNoise.h"

#include "SimMuon/RPCDigitizer/src/RPCSynchronizer.h"
#include "Geometry/CommonTopologies/interface/RectangularStripTopology.h"
#include "Geometry/CommonTopologies/interface/TrapezoidalStripTopology.h"

#include <cmath>
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "CLHEP/Random/RandomEngine.h"
#include "CLHEP/Random/RandFlat.h"
#include <CLHEP/Random/RandGaussQ.h>
#include <CLHEP/Random/RandFlat.h>

#include <FWCore/Framework/interface/Frameworkfwd.h>
#include <FWCore/Framework/interface/EventSetup.h>
#include <FWCore/Framework/interface/EDAnalyzer.h>
#include <FWCore/Framework/interface/Event.h>
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include <FWCore/Framework/interface/ESHandle.h>

#include "SimDataFormats/TrackingHit/interface/PSimHitContainer.h"
#include "SimDataFormats/TrackingHit/interface/PSimHit.h"
#include "Geometry/RPCGeometry/interface/RPCGeometry.h"
#include <Geometry/Records/interface/MuonGeometryRecord.h>
#include "DataFormats/MuonDetId/interface/RPCDetId.h"
#include "SimMuon/RPCDigitizer/src/RPCSimSetUp.h"

#include<cstring>
#include<iostream>
#include<fstream>
#include<string>
#include<vector>
#include<stdlib.h>
#include <utility>
#include <map>

//#include "CLHEP/config/CLHEP.h"
#include "CLHEP/Random/Random.h"
#include "CLHEP/Random/RandFlat.h"
#include "CLHEP/Random/RandPoissonQ.h"

using namespace std;

RPCSimAverageNoise::RPCSimAverageNoise(const edm::ParameterSet& config) : 
  RPCSim(config)
{
  aveEff = config.getParameter<double>("averageEfficiency");
  aveCls = config.getParameter<double>("averageClusterSize");
  resRPC = config.getParameter<double>("timeResolution");
  timOff = config.getParameter<double>("timingRPCOffset");
  dtimCs = config.getParameter<double>("deltatimeAdjacentStrip");
  resEle = config.getParameter<double>("timeJitter");
  sspeed = config.getParameter<double>("signalPropagationSpeed");
  lbGate = config.getParameter<double>("linkGateWidth");
  rpcdigiprint = config.getParameter<bool>("printOutDigitizer");
  rate=config.getParameter<double>("Rate");
  nbxing=config.getParameter<int>("Nbxing");
  gate=config.getParameter<double>("Gate");
  frate=config.getParameter<double>("Frate");

  if (rpcdigiprint) {
    std::cout <<"Average Efficiency        = "<<aveEff<<std::endl;
    std::cout <<"Average Cluster Size      = "<<aveCls<<" strips"<<std::endl;
    std::cout <<"RPC Time Resolution       = "<<resRPC<<" ns"<<std::endl;
    std::cout <<"RPC Signal formation time = "<<timOff<<" ns"<<std::endl;
    std::cout <<"RPC adjacent strip delay  = "<<dtimCs<<" ns"<<std::endl;
    std::cout <<"Electronic Jitter         = "<<resEle<<" ns"<<std::endl;
    std::cout <<"Signal propagation time   = "<<sspeed<<" x c"<<std::endl;
    std::cout <<"Link Board Gate Width     = "<<lbGate<<" ns"<<std::endl;
  }

  _rpcSync = new RPCSynchronizer(config);

}

void RPCSimAverageNoise::setRandomEngine(CLHEP::HepRandomEngine& eng){
  flatDistribution = new CLHEP::RandFlat(eng);
  flatDistribution2 = new CLHEP::RandFlat(eng);
  poissonDistribution_ = new CLHEP::RandPoissonQ(eng);
  _rpcSync->setRandomEngine(eng);
}

RPCSimAverageNoise::~RPCSimAverageNoise()
{
  //Deleting the distribution defined in the constructor
  delete flatDistribution;
  delete flatDistribution2;
  delete poissonDistribution_;
  delete _rpcSync;
}

int RPCSimAverageNoise::getClSize(float posX)
{

  std::map< int, std::vector<double> > clsMap = getRPCSimSetUp()->getClsMap();

  int cnt = 1;
  int min = 1;
  double func=0.0;
  std::vector<double> sum_clsize;

  double rr_cl = flatDistribution->fire();
  if(0.0 <= posX && posX < 0.2)  {
    func = (clsMap[1])[(clsMap[1]).size()-1]*(rr_cl);
    sum_clsize = clsMap[1];
  }
  if(0.2 <= posX && posX < 0.4) {
    func = (clsMap[2])[(clsMap[2]).size()-1]*(rr_cl);
    sum_clsize = clsMap[2];
  }
  if(0.4 <= posX && posX < 0.6) {
    func = (clsMap[3])[(clsMap[3]).size()-1]*(rr_cl);
    sum_clsize = clsMap[3];
  }
  if(0.6 <= posX && posX < 0.8) {
    func = (clsMap[4])[(clsMap[4]).size()-1]*(rr_cl);
    sum_clsize = clsMap[4];
  }
  if(0.8 <= posX && posX < 1.0)  {
    func = (clsMap[5])[(clsMap[5]).size()-1]*(rr_cl);
    sum_clsize = clsMap[5];
  }

  for(vector<double>::iterator iter = sum_clsize.begin();
      iter != sum_clsize.end(); ++iter){
    cnt++;
    if(func > (*iter)){
      min = cnt;
    }
    else if(func < (*iter)){
      break;
    }
  }
  return min;
}


void
RPCSimAverageNoise::simulate(const RPCRoll* roll,
                        const edm::PSimHitContainer& rpcHits)
{
  _rpcSync->setRPCSimSetUp(getRPCSimSetUp());
  theRpcDigiSimLinks.clear();
  theDetectorHitMap.clear();
  theRpcDigiSimLinks = RPCDigiSimLinks(roll->id().rawId());

  const Topology& topology=roll->specs()->topology();

  for (edm::PSimHitContainer::const_iterator _hit = rpcHits.begin();
       _hit != rpcHits.end(); ++_hit){

    // Here I hould check if the RPC are up side down;
    const LocalPoint& entr=_hit->entryPoint();
    int time_hit = _rpcSync->getSimHitBx(&(*_hit));
    float posX = roll->strip(_hit->localPosition()) - static_cast<int>(roll->strip(_hit->localPosition()));

    // Effinciecy

    if (flatDistribution->fire() < aveEff) {

      int centralStrip = topology.channel(entr)+1;  
      int fstrip=centralStrip;
      int lstrip=centralStrip;
      // Compute the cluster size
      double w = flatDistribution->fire(1);
      if (w < 1.e-10) w=1.e-10;
      int clsize = this->getClSize(posX);

      std::vector<int> cls;
      cls.push_back(centralStrip);
      if (clsize > 1){
        for (int cl = 0; cl < (clsize-1)/2; cl++)
          {
            if (centralStrip - cl -1 >= 1  ){
              fstrip = centralStrip-cl-1;
              cls.push_back(fstrip);
            }
            if (centralStrip + cl + 1 <= roll->nstrips() ){
              lstrip = centralStrip+cl+1;
              cls.push_back(lstrip);
            }
          }
        if (clsize%2 == 0 ){
          // insert the last strip according to the 
          // simhit position in the central strip 
          double deltaw=roll->centreOfStrip(centralStrip).x()-entr.x();
          if (deltaw<0.) {
            if (lstrip < roll->nstrips() ){
              lstrip++;
              cls.push_back(lstrip);
            }
          }else{
            if (fstrip > 1 ){
              fstrip--;
              cls.push_back(fstrip);
            }
          }
        }
      }

      for (std::vector<int>::iterator i=cls.begin(); i!=cls.end();i++){
        // Check the timing of the adjacent strip
        std::pair<int, int> digi(*i,time_hit );

        theDetectorHitMap.insert(DetectorHitMap::value_type(digi,&(*_hit)));
        strips.insert(digi);
      }
    }
  }
}

void RPCSimAverageNoise::simulateNoise(const RPCRoll* roll)
{
  RPCDetId rpcId = roll->id();
  std::vector<float> vnoise = (getRPCSimSetUp())->getNoise(rpcId.rawId());
  unsigned int nstrips = roll->nstrips();

  double area = 0.0;
  
  if ( rpcId.region() == 0 )
    {
      const RectangularStripTopology* top_ = dynamic_cast<const
        RectangularStripTopology*>(&(roll->topology()));
      float xmin = (top_->localPosition(0.)).x();
      float xmax = (top_->localPosition((float)roll->nstrips())).x();
      float striplength = (top_->stripLength());
      area = striplength*(xmax-xmin);
    }
  else
    {
      const TrapezoidalStripTopology* top_=dynamic_cast<const TrapezoidalStripTopology*>(&(roll->topology()));
      float xmin = (top_->localPosition(0.)).x();
      float xmax = (top_->localPosition((float)roll->nstrips())).x();
      float striplength = (top_->stripLength());
      area = striplength*(xmax-xmin);
    }
  for(unsigned int j = 0; j < vnoise.size(); ++j){
    
    if(j >= nstrips) break; 

    double ave = frate*vnoise[j]*nbxing*gate*area*1.0e-9;
    N_hits = poissonDistribution_->fire(ave);

    for (int i = 0; i < N_hits; i++ ){
      int time_hit = (static_cast<int>(flatDistribution2->fire((nbxing*gate)/gate))) - nbxing/2;
      std::pair<int, int> digi(j+1,time_hit);
      strips.insert(digi);
    }
  }
}