/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Mixing/Base/src/BMixingModule.cc

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// File: BMixingModule.cc
// Description:  see BMixingModule.h
// Author:  Ursula Berthon, LLR Palaiseau, Bill Tanenbaum
//
//--------------------------------------------

#include "Mixing/Base/interface/BMixingModule.h"
#include "FWCore/Utilities/interface/GetPassID.h"
#include "FWCore/Version/interface/GetReleaseVersion.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/EventPrincipal.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DataFormats/Common/interface/Handle.h"

#include "TFile.h"
#include "TH1F.h"

using namespace std;

int edm::BMixingModule::vertexoffset = 0;
const unsigned int edm::BMixingModule::maxNbSources_ =4;

namespace
{
  boost::shared_ptr<edm::PileUp>
  maybeMakePileUp(edm::ParameterSet const& ps,std::string sourceName, const int minb, const int maxb, const bool playback)
  { 
    boost::shared_ptr<edm::PileUp> pileup; // value to be returned
    // Make sure we have a parameter named 'sourceName'
    if (ps.exists(sourceName))
      {
        // We have the parameter
        // and if we have either averageNumber or cfg by luminosity... make the PileUp
        double averageNumber;
        std::string histoFileName=" ";
        std::string histoName =" ";
        TH1F * h = new TH1F("h","h",10,0,10);
        vector<int> dataProbFunctionVar;
        vector<double> dataProb;
        
        
        const edm::ParameterSet & psin=ps.getParameter<edm::ParameterSet>(sourceName);
        std::string type_=psin.getParameter<std::string>("type");
        if (ps.exists("readDB") && ps.getParameter<bool>("readDB")){
          //in case of DB access, do not try to load anything from the PSet, but wait for beginRun.
          edm::LogError("BMixingModule")<<"Will read from DB: reset to a dummy PileUp object.";
          pileup.reset(new edm::PileUp(psin,0,0,playback));
          return pileup;
        }
        if (type_!="none"){
          if (psin.exists("nbPileupEvents")) {
            edm::ParameterSet psin_average=psin.getParameter<edm::ParameterSet>("nbPileupEvents");
            if (psin_average.exists("averageNumber"))
              {
                averageNumber=psin_average.getParameter<double>("averageNumber");
                pileup.reset(new edm::PileUp(psin,averageNumber,h,playback));
                edm::LogInfo("MixingModule") <<" Created source "<<sourceName<<" with averageNumber "<<averageNumber;
              }
            else if (psin_average.exists("fileName") && psin_average.exists("histoName")) {
                std::string histoFileName = psin_average.getUntrackedParameter<std::string>("fileName");
                std::string histoName = psin_average.getUntrackedParameter<std::string>("histoName");
                                                
                TFile *infile = new TFile(histoFileName.c_str());
                TH1F *h = (TH1F*)infile->Get(histoName.c_str());
                
                // Check if the histogram exists           
                if (!h) {
                  throw cms::Exception("HistogramNotFound") << " Could not find the histogram " << histoName 
                                                            << "in the file " << histoFileName << "." << std::endl;
                }else{
                  edm::LogInfo("MixingModule") << "Open a root file " << histoFileName << " containing the probability distribution histogram " << histoName << std::endl;
                  edm::LogInfo("MixingModule") << "The PileUp number to be added will be chosen randomly from this histogram" << std::endl;
                }
                
                // Check if the histogram is normalized
                if (((h->Integral() - 1) > 1.0e-02) && ((h->Integral() - 1) < -1.0e-02)) throw cms::Exception("BadHistoDistribution") << "The histogram should be normalized!" << std::endl;
                                                
                // Get the averageNumber from the histo 
                averageNumber = h->GetMean();
                
                pileup.reset(new edm::PileUp(psin,averageNumber,h,playback));
                edm::LogInfo("MixingModule") <<" Created source "<<sourceName<<" with averageNumber "<<averageNumber;
              
              }
            else if (psin_average.exists("probFunctionVariable") && psin_average.exists("probValue") && psin_average.exists("histoFileName"))
              {
                if (type_!="probFunction") {
                  edm::LogError("MisConfiguration")<<"type is set to: "<<type_<<" while parameters implies probFunction; changing.";
                  type_="probFunction";
                }

                dataProbFunctionVar = psin_average.getParameter<vector<int> >("probFunctionVariable");
                dataProb = psin_average.getParameter<vector<double> >("probValue");
                histoFileName = psin_average.getUntrackedParameter<std::string>("histoFileName"); 
                                                        
                int varSize = (int) dataProbFunctionVar.size();
                int probSize = (int) dataProb.size();
                
                if ((dataProbFunctionVar[0] != 0) || (dataProbFunctionVar[varSize - 1] != (varSize - 1))) 
                  throw cms::Exception("BadProbFunction") << "Please, check the variables of the probability function! The first variable should be 0 and the difference between two variables should be 1." << endl;
                
                // Complete the vector containing the probability  function data
                // with the values "0"
                if (probSize < varSize){
                  edm::LogInfo("MixingModule") << " The probability function data will be completed with " <<(varSize - probSize)  <<" values 0."; 
                  
                  for (int i=0; i<(varSize - probSize); i++) dataProb.push_back(0);
                  
                  probSize = dataProb.size();
                  edm::LogInfo("MixingModule") << " The number of the P(x) data set after adding the values 0 is " << probSize;
                }
                                        
                // Create an histogram with the data from the probability function provided by the user           
                int xmin = (int) dataProbFunctionVar[0];
                int xmax = (int) dataProbFunctionVar[varSize-1]+1;  // need upper edge to be one beyond last value
                int numBins = varSize;
                
                edm::LogInfo("MixingModule") << "An histogram will be created with " << numBins << " bins in the range ("<< xmin << "," << xmax << ")." << std::endl;
                                
                TH1F *hprob = new TH1F("h","Histo from the user's probability function",numBins,xmin,xmax); 
                
                LogDebug("MixingModule") << "Filling histogram with the following data:" << std::endl;
                
                for (int j=0; j < numBins ; j++){
                  LogDebug("MixingModule") << " x = " << dataProbFunctionVar[j ]<< " P(x) = " << dataProb[j];
                  hprob->Fill(dataProbFunctionVar[j]+0.5,dataProb[j]); // assuming integer values for the bins, fill bin centers, not edges 
                }
                                
                // Check if the histogram is normalized
                if ( ((hprob->Integral() - 1) > 1.0e-02) && ((hprob->Integral() - 1) < -1.0e-02)){ 
                  throw cms::Exception("BadProbFunction") << "The probability function should be normalized!!! " << endl;
                }
                
                averageNumber = hprob->GetMean();
                                
                // Write the created histogram into a root file
                edm::LogInfo("MixingModule") << " The histogram created from the x, P(x) values will be written into the root file " << histoFileName; 
                
                TFile * outfile = new TFile(histoFileName.c_str(),"RECREATE");
                hprob->Write();
                outfile->Write();
                outfile->Close();
                outfile->Delete();              
                
                pileup.reset(new edm::PileUp(psin,averageNumber,hprob,playback));
                edm::LogInfo("MixingModule") <<" Created source "<<sourceName<<" with averageNumber "<<averageNumber;
                
              } 
            //special for pileup input
            else if (sourceName=="input" && psin_average.exists("Lumi") && psin_average.exists("sigmaInel")) {
              averageNumber=psin_average.getParameter<double>("Lumi")*psin_average.getParameter<double>("sigmaInel")*ps.getParameter<int>("bunchspace")/1000*3564./2808.;  //FIXME
              pileup.reset(new
              edm::PileUp(psin,averageNumber,h,playback));
              edm::LogInfo("MixingModule") <<" Created source "<<sourceName<<" with minBunch,maxBunch "<<minb<<" "<<maxb;
              edm::LogInfo("MixingModule")<<" Luminosity configuration, average number used is "<<averageNumber;
            }
          }
        }
      }
    return pileup;
  }
}

namespace edm {

  // Constructor 
  BMixingModule::BMixingModule(const edm::ParameterSet& pset) :
    bunchSpace_(pset.getParameter<int>("bunchspace")),
    minBunch_((pset.getParameter<int>("minBunch")*25)/pset.getParameter<int>("bunchspace")),
    maxBunch_((pset.getParameter<int>("maxBunch")*25)/pset.getParameter<int>("bunchspace")),
    mixProdStep1_(pset.getParameter<bool>("mixProdStep1")),
    mixProdStep2_(pset.getParameter<bool>("mixProdStep2")),
    readDB_(false)
  {
    if (pset.exists("readDB"))      readDB_=pset.getParameter<bool>("readDB");

    playback_=pset.getUntrackedParameter<bool>("playback",false);

    if (playback_) {
      //this could be explicitely checked
      LogInfo("MixingModule") <<" ATTENTION:Mixing will be done in playback mode! \n"
                              <<" ATTENTION:Mixing Configuration must be the same as for the original mixing!";
    }

    // Just for debugging print out.
    sourceNames_.push_back("input");
    sourceNames_.push_back("cosmics");
    sourceNames_.push_back("beamhalo_plus");
    sourceNames_.push_back("beamhalo_minus");

    for (size_t makeIdx = 0; makeIdx < maxNbSources_; makeIdx++ ) {
      inputSources_.push_back(maybeMakePileUp(pset,sourceNames_[makeIdx],
                                              minBunch_,maxBunch_,playback_));
      if (inputSources_.back()) inputSources_.back()->input(makeIdx);
    }
  }

  // Virtual destructor needed.
  BMixingModule::~BMixingModule() {;}

  // method call at begin run/lumi to reload the mixing configuration
  void BMixingModule::beginLuminosityBlock(edm::LuminosityBlock const&, edm::EventSetup const& setup){
    update(setup);
  }

  void BMixingModule::beginRun(edm::Run const& r, edm::EventSetup const& setup){
    update(setup);
  }

  void BMixingModule::update(const edm::EventSetup & setup){
    if (readDB_ && parameterWatcher_.check(setup)){
      for (size_t makeIdx = 0; makeIdx < maxNbSources_; makeIdx++ ) {
        if (inputSources_[makeIdx]) inputSources_[makeIdx]->reload(setup);
      }
      reload(setup);
    }
  }

  // Functions that get called by framework every event
  void BMixingModule::produce(edm::Event& e, const edm::EventSetup& setup) { 

    // Check if the signal is present in the root file 
    // for all the objects we want to mix
    checkSignal(e);
    
    // Create EDProduct
    createnewEDProduct();

    initializeEvent(e, setup);

    // Add signals
    if (!mixProdStep1_){ 
      addSignals(e,setup);
    }

    doPileUp(e,setup);

    // Includes putting digi products into the edm::Event.
    finalizeEvent(e, setup);

    // Put output into event (here only playback info)
    put(e,setup);
  }

  void BMixingModule::dropUnwantedBranches(std::vector<std::string> const& wantedBranches) {
    for (size_t dropIdx=0; dropIdx<maxNbSources_; dropIdx++ ) {
      if( inputSources_[dropIdx] ) inputSources_[dropIdx]->dropUnwantedBranches(wantedBranches);
    }
  }

  void BMixingModule::endJob() {
    for (size_t endIdx=0; endIdx<maxNbSources_; endIdx++ ) {
      if( inputSources_[endIdx] ) inputSources_[endIdx]->endJob();
    }
  }

} //edm