/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/SimTracker/SiStripDigitizer/plugins/SiStripDigitizerAlgorithm.cc

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// File: SiStripDigitizerAlgorithm.cc
// Description:  Steering class for digitization.

// Modified 15/May/2013 mark.grimes@bristol.ac.uk - Modified so that the digi-sim link has the correct
// index for the sim hits stored. It was previously always set to zero (I won't mention that it was
// me who originally wrote that).

#include <vector>
#include <algorithm>
#include <iostream>
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "SiStripDigitizerAlgorithm.h"
#include "SimDataFormats/TrackingHit/interface/PSimHitContainer.h"
#include "SimDataFormats/TrackerDigiSimLink/interface/StripDigiSimLink.h"
#include "DataFormats/Common/interface/DetSetVector.h"
#include "DataFormats/GeometrySurface/interface/BoundSurface.h"
#include "SimGeneral/HepPDTRecord/interface/ParticleDataTable.h"
#include "CalibTracker/Records/interface/SiStripDependentRecords.h"
#include "CondFormats/SiStripObjects/interface/SiStripLorentzAngle.h"
#include "CondFormats/DataRecord/interface/SiStripCondDataRecords.h"
#include "CondFormats/SiStripObjects/interface/SiStripNoises.h"
#include "CondFormats/SiStripObjects/interface/SiStripThreshold.h"
#include "CondFormats/SiStripObjects/interface/SiStripPedestals.h"
#include "CondFormats/SiStripObjects/interface/SiStripBadStrip.h"
#include "CLHEP/Random/RandFlat.h"

SiStripDigitizerAlgorithm::SiStripDigitizerAlgorithm(const edm::ParameterSet& conf, CLHEP::HepRandomEngine& eng):
  lorentzAngleName(conf.getParameter<std::string>("LorentzAngle")),
  theThreshold(conf.getParameter<double>("NoiseSigmaThreshold")),
  cmnRMStib(conf.getParameter<double>("cmnRMStib")),
  cmnRMStob(conf.getParameter<double>("cmnRMStob")),
  cmnRMStid(conf.getParameter<double>("cmnRMStid")),
  cmnRMStec(conf.getParameter<double>("cmnRMStec")),
  APVSaturationProb(conf.getParameter<double>("APVSaturationProb")),
  makeDigiSimLinks_(conf.getUntrackedParameter<bool>("makeDigiSimLinks", false)),
  peakMode(conf.getParameter<bool>("APVpeakmode")),
  noise(conf.getParameter<bool>("Noise")),
  RealPedestals(conf.getParameter<bool>("RealPedestals")), 
  SingleStripNoise(conf.getParameter<bool>("SingleStripNoise")),
  CommonModeNoise(conf.getParameter<bool>("CommonModeNoise")),
  BaselineShift(conf.getParameter<bool>("BaselineShift")),
  APVSaturationFromHIP(conf.getParameter<bool>("APVSaturationFromHIP")),
  theFedAlgo(conf.getParameter<int>("FedAlgorithm")),
  zeroSuppression(conf.getParameter<bool>("ZeroSuppression")),
  theElectronPerADC(conf.getParameter<double>( peakMode ? "electronPerAdcPeak" : "electronPerAdcDec" )),
  theTOFCutForPeak(conf.getParameter<double>("TOFCutForPeak")),
  theTOFCutForDeconvolution(conf.getParameter<double>("TOFCutForDeconvolution")),
  tofCut(peakMode ? theTOFCutForPeak : theTOFCutForDeconvolution),
  cosmicShift(conf.getUntrackedParameter<double>("CosmicDelayShift")),
  inefficiency(conf.getParameter<double>("Inefficiency")),
  pedOffset((unsigned int)conf.getParameter<double>("PedestalsOffset")),
  theSiHitDigitizer(new SiHitDigitizer(conf, eng)),
  theSiPileUpSignals(new SiPileUpSignals()),
  theSiNoiseAdder(new SiGaussianTailNoiseAdder(theThreshold, eng)),
  theSiDigitalConverter(new SiTrivialDigitalConverter(theElectronPerADC)),
  theSiZeroSuppress(new SiStripFedZeroSuppression(theFedAlgo)),
  theFlatDistribution(new CLHEP::RandFlat(eng, 0., 1.)) {

  if (peakMode) {
    LogDebug("StripDigiInfo")<<"APVs running in peak mode (poor time resolution)";
  } else {
    LogDebug("StripDigiInfo")<<"APVs running in deconvolution mode (good time resolution)";
  };
}

SiStripDigitizerAlgorithm::~SiStripDigitizerAlgorithm(){
}

void
SiStripDigitizerAlgorithm::initializeDetUnit(StripGeomDetUnit* det, const edm::EventSetup& iSetup) {
  edm::ESHandle<SiStripBadStrip> deadChannelHandle;
  iSetup.get<SiStripBadChannelRcd>().get(deadChannelHandle);

  unsigned int detId = det->geographicalId().rawId();
  int numStrips = (det->specificTopology()).nstrips();  

  SiStripBadStrip::Range detBadStripRange = deadChannelHandle->getRange(detId);
  //storing the bad strip of the the module. the module is not removed but just signal put to 0
  std::vector<bool>& badChannels = allBadChannels[detId];
  badChannels.clear();
  badChannels.insert(badChannels.begin(), numStrips, false);
  for(SiStripBadStrip::ContainerIterator it = detBadStripRange.first; it != detBadStripRange.second; ++it) {
    SiStripBadStrip::data fs = deadChannelHandle->decode(*it);
    for(int strip = fs.firstStrip; strip < fs.firstStrip + fs.range; ++strip) badChannels[strip] = true;
  }
  firstChannelsWithSignal[detId] = numStrips;
  lastChannelsWithSignal[detId]= 0;
}

void
SiStripDigitizerAlgorithm::initializeEvent(const edm::EventSetup& iSetup) {
  theSiPileUpSignals->reset();
  // This should be clear by after all calls to digitize(), but I might as well make sure
  associationInfoForDetId_.clear();

  //get gain noise pedestal lorentzAngle from ES handle
  edm::ESHandle<ParticleDataTable> pdt;
  iSetup.getData(pdt);
  setParticleDataTable(&*pdt);
  iSetup.get<SiStripLorentzAngleSimRcd>().get(lorentzAngleName,lorentzAngleHandle);
}

//  Run the algorithm for a given module
//  ------------------------------------

void
SiStripDigitizerAlgorithm::accumulateSimHits(std::vector<PSimHit>::const_iterator inputBegin,
                                             std::vector<PSimHit>::const_iterator inputEnd,
                                             size_t inputBeginGlobalIndex,
                                             const StripGeomDetUnit* det,
                                             const GlobalVector& bfield,
                                             const TrackerTopology *tTopo) {
  // produce SignalPoints for all SimHits in detector
  unsigned int detID = det->geographicalId().rawId();
  int numStrips = (det->specificTopology()).nstrips();  

  std::vector<bool>& badChannels = allBadChannels[detID];
  size_t thisFirstChannelWithSignal = numStrips;
  size_t thisLastChannelWithSignal = numStrips;

  float langle = (lorentzAngleHandle.isValid()) ? lorentzAngleHandle->getLorentzAngle(detID) : 0.;

  std::vector<float> locAmpl(numStrips, 0.);

  // Loop over hits

  uint32_t detId = det->geographicalId().rawId();
  // First: loop on the SimHits
  if(theFlatDistribution->fire()>inefficiency) {
    AssociationInfoForChannel* pDetIDAssociationInfo; // I only need this if makeDigiSimLinks_ is true...
    if( makeDigiSimLinks_ ) pDetIDAssociationInfo=&(associationInfoForDetId_[detId]); // ...so only search the map if that is the case
    std::vector<float> previousLocalAmplitude; // Only used if makeDigiSimLinks_ is true. Needed to work out the change in amplitude.

    size_t simHitGlobalIndex=inputBeginGlobalIndex; // This needs to stored to create the digi-sim link later
    for (std::vector<PSimHit>::const_iterator simHitIter = inputBegin; simHitIter != inputEnd; ++simHitIter, ++simHitGlobalIndex ) {
      // skip hits not in this detector.
      if((*simHitIter).detUnitId() != detId) {
        continue;
      }
      // check TOF
      if (std::fabs(simHitIter->tof() - cosmicShift - det->surface().toGlobal(simHitIter->localPosition()).mag()/30.) < tofCut && simHitIter->energyLoss()>0) {
        if( makeDigiSimLinks_ ) previousLocalAmplitude=locAmpl; // Not needed except to make the sim link association.
        size_t localFirstChannel = numStrips;
        size_t localLastChannel  = 0;
        // process the hit
        theSiHitDigitizer->processHit(&*simHitIter, *det, bfield, langle, locAmpl, localFirstChannel, localLastChannel, tTopo);
          
                  //APV Killer to simulate HIP effect
                  //------------------------------------------------------
                  
                  if(APVSaturationFromHIP&&!zeroSuppression){
                    int pdg_id = simHitIter->particleType();
                        particle = pdt->particle(pdg_id);
                        if(particle != NULL){
                                float charge = particle->charge();
                                bool isHadron = particle->isHadron();
                            if(charge!=0 && isHadron){
                                        if(theFlatDistribution->fire()<APVSaturationProb){
                                                int FirstAPV = localFirstChannel/128;
                                                int LastAPV = localLastChannel/128;
                                                std::cout << "-------------------HIP--------------" << std::endl;
                                                std::cout << "Killing APVs " << FirstAPV << " - " <<LastAPV << " " << detID <<std::endl;
                                                for(int strip = FirstAPV*128; strip < LastAPV*128 +128; ++strip) {
                                                        badChannels[strip] = true;
                                                }
                                                //doing like that I remove the signal information only after the 
                                                //stip that got the HIP but it remains the signal of the previous
                                                //one. I'll make a further loop to remove all signal
                                        }
                                }
                        }
              }             
                
    
        if(thisFirstChannelWithSignal > localFirstChannel) thisFirstChannelWithSignal = localFirstChannel;
        if(thisLastChannelWithSignal < localLastChannel) thisLastChannelWithSignal = localLastChannel;

        if( makeDigiSimLinks_ ) { // No need to do any of this if truth association was turned off in the configuration
          for( size_t stripIndex=0; stripIndex<locAmpl.size(); ++stripIndex ) {
            // Work out the amplitude from this SimHit from the difference of what it was before and what it is now
            float signalFromThisSimHit=locAmpl[stripIndex]-previousLocalAmplitude[stripIndex];
            if( signalFromThisSimHit!=0 ) { // If this SimHit had any contribution I need to record it.
              auto& associationVector=(*pDetIDAssociationInfo)[stripIndex];
              bool addNewEntry=true;
              // Make sure the hit isn't in already. I've seen this a few times, it always seems to happen in pairs so I think
              // it's something to do with the stereo strips.
              for( auto& associationInfo : associationVector ) {
                if( associationInfo.trackID==simHitIter->trackId() && associationInfo.eventID==simHitIter->eventId() ) {
                  // The hit is already in, so add this second contribution and move on
                  associationInfo.contributionToADC+=signalFromThisSimHit;
                  addNewEntry=false;
                  break;
                }
              } // end of loop over associationVector
              // If the hit wasn't already in create a new association info structure.
              if( addNewEntry ) associationVector.push_back( AssociationInfo{ simHitIter->trackId(), simHitIter->eventId(), signalFromThisSimHit, simHitGlobalIndex } );
            } // end of "if( signalFromThisSimHit!=0 )"
          } // end of loop over locAmpl strips
        } // end of "if( makeDigiSimLinks_ )"
      } // end of TOF check
    } // end for
  }
  theSiPileUpSignals->add(detID, locAmpl, thisFirstChannelWithSignal, thisLastChannelWithSignal);

  if(firstChannelsWithSignal[detID] > thisFirstChannelWithSignal) firstChannelsWithSignal[detID] = thisFirstChannelWithSignal;
  if(lastChannelsWithSignal[detID] < thisLastChannelWithSignal) lastChannelsWithSignal[detID] = thisLastChannelWithSignal;
}

void
SiStripDigitizerAlgorithm::digitize(
                           edm::DetSet<SiStripDigi>& outdigi,
                           edm::DetSet<SiStripRawDigi>& outrawdigi,
                           edm::DetSet<StripDigiSimLink>& outLink,
                           const StripGeomDetUnit *det,
                           edm::ESHandle<SiStripGain> & gainHandle,
                           edm::ESHandle<SiStripThreshold> & thresholdHandle,
                           edm::ESHandle<SiStripNoises> & noiseHandle,
                           edm::ESHandle<SiStripPedestals> & pedestalHandle) {
  unsigned int detID = det->geographicalId().rawId();
  int numStrips = (det->specificTopology()).nstrips();  

  const SiPileUpSignals::SignalMapType* theSignal(theSiPileUpSignals->getSignal(detID));  

  std::vector<float> detAmpl(numStrips, 0.);
  if(theSignal) {
    for(const auto& amp : *theSignal) {
      detAmpl[amp.first] = amp.second;
    }
  }

  //removing signal from the dead (and HIP effected) strips
  std::vector<bool>& badChannels = allBadChannels[detID];
  for(int strip =0; strip < numStrips; ++strip) if(badChannels[strip]) detAmpl[strip] = 0.;

  SiStripNoises::Range detNoiseRange = noiseHandle->getRange(detID);
  SiStripApvGain::Range detGainRange = gainHandle->getRange(detID);
  SiStripPedestals::Range detPedestalRange = pedestalHandle->getRange(detID);

// -----------------------------------------------------------

  auto& firstChannelWithSignal = firstChannelsWithSignal[detID];
  auto& lastChannelWithSignal = lastChannelsWithSignal[detID];
  auto iAssociationInfoByChannel=associationInfoForDetId_.find(detID); // Use an iterator so that I can easily remove it once finished

  if(zeroSuppression){
    if(noise){
          int RefStrip = int(numStrips/2.);
          while(RefStrip<numStrips&&badChannels[RefStrip]){ //if the refstrip is bad, I move up to when I don't find it
                RefStrip++;
          }
          if(RefStrip<numStrips){
                float noiseRMS = noiseHandle->getNoise(RefStrip,detNoiseRange);
                float gainValue = gainHandle->getStripGain(RefStrip, detGainRange);
                theSiNoiseAdder->addNoise(detAmpl,firstChannelWithSignal,lastChannelWithSignal,numStrips,noiseRMS*theElectronPerADC/gainValue);
          }
        }
    DigitalVecType digis;
    theSiZeroSuppress->suppress(theSiDigitalConverter->convert(detAmpl, gainHandle, detID), digis, detID,noiseHandle,thresholdHandle);
    // Now do the association to truth. Note that if truth association was turned off in the configuration this map
    // will be empty and the iterator will always equal associationInfoForDetId_.end().
    if( iAssociationInfoByChannel!=associationInfoForDetId_.end() ) { // make sure the readings for this DetID aren't completely from noise
      for( const auto& iDigi : digis ) {
        auto& associationInfoByChannel=iAssociationInfoByChannel->second;
        const std::vector<AssociationInfo>& associationInfo=associationInfoByChannel[iDigi.channel()];

        // Need to find the total from all sim hits, because this might not be the same as the total
        // digitised due to noise or whatever.
        float totalSimADC=0;
        for( const auto& iAssociationInfo : associationInfo ) totalSimADC+=iAssociationInfo.contributionToADC;
        // Now I know that I can loop again and create the links
        for( const auto& iAssociationInfo : associationInfo ) {
          // Note simHitGlobalIndex has +1 because TrackerHitAssociator (the only place I can find this value being used)
          // expects counting to start at 1, not 0.
          outLink.push_back( StripDigiSimLink( iDigi.channel(), iAssociationInfo.trackID, iAssociationInfo.simHitGlobalIndex+1, iAssociationInfo.eventID, iAssociationInfo.contributionToADC/totalSimADC ) );
        } // end of loop over associationInfo
      } // end of loop over the digis
    } // end of check that iAssociationInfoByChannel is a valid iterator
    outdigi.data = digis;
  }
  
  
  if(!zeroSuppression){
    //if(noise){
      // the constant pedestal offset is needed because
      //   negative adc counts are not allowed in case
      //   Pedestal and CMN subtraction is performed.
      //   The pedestal value read from the conditions
      //   is pedValue and after the pedestal subtraction
      //   the baseline is zero. The Common Mode Noise
      //   is not subtracted from the negative adc counts
      //   channels. Adding pedOffset the baseline is set
      //   to pedOffset after pedestal subtraction and CMN
      //   is subtracted to all the channels since none of
      //   them has negative adc value. The pedOffset is
      //   treated as a constant component in the CMN
      //   estimation and subtracted as CMN.
      
         
                //calculating the charge deposited on each APV and subtracting the shift
                //------------------------------------------------------
                if(BaselineShift){
                   theSiNoiseAdder->addBaselineShift(detAmpl, badChannels);
                }
                
                //Adding the strip noise
                //------------------------------------------------------                                                 
                if(noise){
                    std::vector<float> noiseRMSv;
                        noiseRMSv.clear();
                    noiseRMSv.insert(noiseRMSv.begin(),numStrips,0.);
                        
                    if(SingleStripNoise){
                            for(int strip=0; strip< numStrips; ++strip){
                                        if(!badChannels[strip]) noiseRMSv[strip] = (noiseHandle->getNoise(strip,detNoiseRange))* theElectronPerADC;
                                }
                        
                } else {
                            int RefStrip = 0; //int(numStrips/2.);
                            while(RefStrip<numStrips&&badChannels[RefStrip]){ //if the refstrip is bad, I move up to when I don't find it
                                        RefStrip++;
                                }
                                if(RefStrip<numStrips){
                                        float noiseRMS = noiseHandle->getNoise(RefStrip,detNoiseRange) *theElectronPerADC;
                                        for(int strip=0; strip< numStrips; ++strip){
                                        if(!badChannels[strip]) noiseRMSv[strip] = noiseRMS;
                                        }
                                }
                        }
                        
                        theSiNoiseAdder->addNoiseVR(detAmpl, noiseRMSv);
                }                       
                
                //adding the CMN
                //------------------------------------------------------
        if(CommonModeNoise){
                  float cmnRMS = 0.;
                  DetId  detId(detID);
                  uint32_t SubDet = detId.subdetId();
                  if(SubDet==3){
                    cmnRMS = cmnRMStib;
                  }else if(SubDet==4){
                    cmnRMS = cmnRMStid;
                  }else if(SubDet==5){
                    cmnRMS = cmnRMStob;
                  }else if(SubDet==6){
                    cmnRMS = cmnRMStec;
                  }
                  cmnRMS *= theElectronPerADC;
          theSiNoiseAdder->addCMNoise(detAmpl, cmnRMS, badChannels);
                }
                
                        
                //Adding the pedestals
                //------------------------------------------------------
                
                std::vector<float> vPeds;
                vPeds.clear();
                vPeds.insert(vPeds.begin(),numStrips,0.);
                
                if(RealPedestals){
                    for(int strip=0; strip< numStrips; ++strip){
                           if(!badChannels[strip]) vPeds[strip] = (pedestalHandle->getPed(strip,detPedestalRange)+pedOffset)* theElectronPerADC;
                    }
        } else {
                    for(int strip=0; strip< numStrips; ++strip){
                          if(!badChannels[strip]) vPeds[strip] = pedOffset* theElectronPerADC;
                        }
                }
                
                theSiNoiseAdder->addPedestals(detAmpl, vPeds);  
                
                 
        //if(!RealPedestals&&!CommonModeNoise&&!noise&&!BaselineShift&&!APVSaturationFromHIP){
    //  edm::LogWarning("SiStripDigitizer")<<"You are running the digitizer without Noise generation and without applying Zero Suppression. ARE YOU SURE???";
    //}else{                                                     
    
    DigitalRawVecType rawdigis = theSiDigitalConverter->convertRaw(detAmpl, gainHandle, detID);

    // Now do the association to truth. Note that if truth association was turned off in the configuration this map
    // will be empty and the iterator will always equal associationInfoForDetId_.end().
    if( iAssociationInfoByChannel!=associationInfoForDetId_.end() ) { // make sure the readings for this DetID aren't completely from noise
      // N.B. For the raw digis the channel is inferred from the position in the vector.
      // I'VE NOT TESTED THIS YET!!!!!
      // ToDo Test this properly.
      for( size_t channel=0; channel<rawdigis.size(); ++channel ) {
        auto& associationInfoByChannel=iAssociationInfoByChannel->second;
        const auto iAssociationInfo=associationInfoByChannel.find(channel);
        if( iAssociationInfo==associationInfoByChannel.end() ) continue; // Skip if there is no sim information for this channel (i.e. it's all noise)
        const std::vector<AssociationInfo>& associationInfo=iAssociationInfo->second;

        // Need to find the total from all sim hits, because this might not be the same as the total
        // digitised due to noise or whatever.
        float totalSimADC=0;
        for( const auto& iAssociationInfo : associationInfo ) totalSimADC+=iAssociationInfo.contributionToADC;
        // Now I know that I can loop again and create the links
        for( const auto& iAssociationInfo : associationInfo ) {
          // Note simHitGlobalIndex has +1 because TrackerHitAssociator (the only place I can find this value being used)
          // expects counting to start at 1, not 0.
          outLink.push_back( StripDigiSimLink( channel, iAssociationInfo.trackID, iAssociationInfo.simHitGlobalIndex+1, iAssociationInfo.eventID, iAssociationInfo.contributionToADC/totalSimADC ) );
        } // end of loop over associationInfo
      } // end of loop over the digis
    } // end of check that iAssociationInfoByChannel is a valid iterator

    outrawdigi.data = rawdigis;
        
        //}
  }

  // Now that I've finished with this entry in the map of associations, I can remove it.
  // Note that there might not be an association if the ADC reading is from noise in which
  // case associationIsValid will be false.
  if( iAssociationInfoByChannel!=associationInfoForDetId_.end() ) associationInfoForDetId_.erase(iAssociationInfoByChannel);
}