/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/Calibration/Tools/interface/MinL3AlgoUniv.h

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#ifndef MinL3AlgoUniv_H
#define MinL3AlgoUniv_H

#include <vector>
#include <iostream>
#include <map>
#include <math.h>

template<class IDdet>
class MinL3AlgoUniv
{
public:
  typedef std::map<IDdet,float> IDmap;
  typedef typename IDmap::value_type IDmapvalue;
  typedef typename IDmap::iterator iter_IDmap;
  typedef typename IDmap::const_iterator citer_IDmap;

  MinL3AlgoUniv(float kweight_ = 0.);

  ~MinL3AlgoUniv();

  IDmap iterate(const std::vector<std::vector<float> >& eventMatrix, const std::vector<std::vector<IDdet> >& idMatrix, const std::vector<float>& energyVector, const int& nIter, const bool& normalizeFlag = false);

  void addEvent(const std::vector<float>& myCluster, const std::vector<IDdet>& idCluster, const float& energy);

  std::vector<float> recalibrateEvent(const std::vector<float>& myCluster, const std::vector<IDdet>& idCluster, const IDmap& newCalibration); 

  IDmap getSolution(const bool resetsolution=true);

  void resetSolution(); 

private:

  float kweight;
  int countEvents;
  IDmap wsum;
  IDmap Ewsum;

};



template<class IDdet>
MinL3AlgoUniv<IDdet>::MinL3AlgoUniv(float kweight_)
  :kweight(kweight_), countEvents(0)
{
  resetSolution();
}


template<class IDdet>
MinL3AlgoUniv<IDdet>::~MinL3AlgoUniv()
{
}


template<class IDdet>
typename MinL3AlgoUniv<IDdet>::IDmap MinL3AlgoUniv<IDdet>::iterate(const std::vector<std::vector<float> >& eventMatrix, const std::vector<std::vector<IDdet> >& idMatrix, const std::vector<float>& energyVector, const int& nIter, const bool& normalizeFlag)
{
  int Nevents = eventMatrix.size(); // Number of events to calibrate with

  IDmap totalSolution;
  IDmap iterSolution;
  std::vector<std::vector<float> > myEventMatrix(eventMatrix);
  std::vector<float> myEnergyVector(energyVector);

  int i;

  // Iterate the correction
  for (int iter=1;iter<=nIter;iter++) 
    {

      // if normalization flag is set, normalize energies
      float sumOverEnergy;
      if (normalizeFlag)
        {
          float scale = 0.;
          
          for (i=0; i<Nevents; i++)
            {
              sumOverEnergy = 0.;
              for (unsigned j=0; j<myEventMatrix[i].size(); j++) {sumOverEnergy += myEventMatrix[i][j];}
              sumOverEnergy /= myEnergyVector[i];
              scale += sumOverEnergy;
            }
          scale /= Nevents;
          
          for (i=0; i<Nevents; i++) {myEnergyVector[i] *= scale;}         
        } // end normalize energies

      // now the real work starts:
      for (int iEvt=0; iEvt < Nevents; iEvt++)
        {
          addEvent(myEventMatrix[iEvt], idMatrix[iEvt], myEnergyVector[iEvt]);
        }
      iterSolution = getSolution();
      if (iterSolution.empty()) return iterSolution;

      // re-calibrate eventMatrix with solution
      for (int ievent = 0; ievent<Nevents; ievent++)
        {
          myEventMatrix[ievent] = recalibrateEvent(myEventMatrix[ievent], idMatrix[ievent], iterSolution);
        }

      // save solution into theCalibVector
      for (iter_IDmap i = iterSolution.begin(); i != iterSolution.end(); i++)
        {
          iter_IDmap itotal = totalSolution.find(i->first);
          if (itotal == totalSolution.end())
            {
              totalSolution.insert(IDmapvalue(i->first,i->second));
            }
          else
            {
              itotal->second *= i->second;
            }
        }

      //      resetSolution(); // reset for new iteration, now: getSolution does it automatically if not vetoed
    } // end iterate correction

  return totalSolution;
}


template<class IDdet>
void MinL3AlgoUniv<IDdet>::addEvent(const std::vector<float>& myCluster, const std::vector<IDdet>& idCluster, const float& energy)
{
  countEvents++;

  float w, invsumXmatrix;
  float eventw;
  // Loop over the crystal matrix to find the sum
  float sumXmatrix=0.;
      
  for (unsigned i=0; i<myCluster.size(); i++) { sumXmatrix += myCluster[i]; }
      
  // event weighting
  eventw = 1 - fabs(1 - sumXmatrix/energy);
  eventw = pow(eventw,kweight);
      
  if (sumXmatrix != 0.)
    {
      invsumXmatrix = 1/sumXmatrix;
      // Loop over the crystal matrix (3x3,5x5,7x7) again and calculate the weights for each xtal
      for (unsigned i=0; i<myCluster.size(); i++) 
        {               
          w = myCluster[i] * invsumXmatrix;

          // include the weights into wsum, Ewsum
          iter_IDmap iwsum = wsum.find(idCluster[i]);
          if (iwsum == wsum.end()) wsum.insert(IDmapvalue(idCluster[i],w*eventw));
          else iwsum->second += w*eventw;

          iter_IDmap iEwsum = Ewsum.find(idCluster[i]);
          if (iEwsum == Ewsum.end()) Ewsum.insert(IDmapvalue(idCluster[i], (w*eventw * energy * invsumXmatrix) ));
          else iEwsum->second += (w*eventw * energy * invsumXmatrix);
        }
    }
  //  else {std::cout << " Debug: dropping null event: " << countEvents << std::endl;}
}


template<class IDdet>
typename MinL3AlgoUniv<IDdet>::IDmap MinL3AlgoUniv<IDdet>::getSolution(const bool resetsolution)
{
  IDmap solution;

  for (iter_IDmap i = wsum.begin(); i != wsum.end(); i++)
    {
      iter_IDmap iEwsum = Ewsum.find(i->first);
      float myValue = 1;
      if (i->second != 0) myValue = iEwsum->second / i->second;

      solution.insert(IDmapvalue(i->first,myValue));
    }
  
  if (resetsolution) resetSolution();

  return solution;
}


template<class IDdet>
void MinL3AlgoUniv<IDdet>::resetSolution()
{
  wsum.clear();
  Ewsum.clear();
}


template<class IDdet>
std::vector<float> MinL3AlgoUniv<IDdet>::recalibrateEvent(const std::vector<float>& myCluster, const std::vector<IDdet> &idCluster, const IDmap& newCalibration)
{
  std::vector<float> newCluster(myCluster);

  for (unsigned i=0; i<myCluster.size(); i++) 
    {
      citer_IDmap icalib = newCalibration.find(idCluster[i]);
      if (icalib != newCalibration.end())
        {
          newCluster[i] *= icalib->second;
        }
      else
        {
          std::cout << "No calibration available for this element." << std::endl;
        }

    }

  return newCluster;
}


#endif // MinL3AlgoUniv_H