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#ifndef SIGMET_ASIGNIFICANCE_H
#define SIGMET_ASIGNIFICANCE_H
// -*- C++ -*-
//
// Package:    METAlgorithms
// Class:      SigInputObj
// 
//
// Original Author:  Kyle Story, Freya Blekman (Cornell University)
//         Created:  Fri Apr 18 11:58:33 CEST 2008
// $Id: significanceAlgo.h,v 1.2 2009/10/21 11:27:11 fblekman Exp $
//
//

//  
//  Purpose:
//  
//  This subroutine takes in a vector of type SigInputObj that includes
//  all of the physics objects in the event.  It then calculates
//  the log significance of the MET of the event.
//
//  The Significance (S) is defined as:
//    ln(S) = 1/2 Chisq_0
//  where Chisq_0 is the value of Chi squared at MET=0.
//
//
// $Id: significanceAlgo.h,v 1.2 2009/10/21 11:27:11 fblekman Exp $
// 
// Revision history
// 
// $Log: significanceAlgo.h,v $
// Revision 1.2  2009/10/21 11:27:11  fblekman
// merged version with cvs head - includes new interfaces for MET significance to make it possible to correct MET objects later and also correct the signficance.
//
// Revision 1.1  2008/04/18 10:12:55  fblekman
// First implementation (very preliminary) of missing ET significance algorithm.
// This code is currently still heavily under development so please bear with us.
//
// cheers,
//
//   Freya (for the Cornell MET significance group)
//
// Revision 1.2  2008/03/26 17:52:19  kstory
// Tower Based Algorithm.  significanceAlgo now using matrix operations.
//
// Revision 1.1.1.1  2008/02/29 22:25:02  kstory
// Tower-Based Algorithm
//
// Revision 1.2  2008/02/13 13:14:37  fblekman
// updated version with electrons
//
// Revision 1.3  2007/12/07 00:20:10  kstory
// MET phi was changed to have a range of [-pi, pi]
//
// Revision 1.2  2007/11/30 22:02:33  kstory
// Changed the arguments to allow calculation of the total MET and the MET_phi.
//
//

#include <vector>
#include <string>
#include <iostream>
#include <sstream>

#include "RecoMET/METAlgorithms/interface/SigInputObj.h"
#include "TMatrixTBase.h"
#include "TMatrixD.h"
#include "TVectorD.h"

namespace metsig{
  class significanceAlgo{
  public:
    significanceAlgo();
    ~significanceAlgo();

    const void addSignifMatrix(const TMatrixD &input);
    const void setSignifMatrix(const TMatrixD &input,const double &met_r, const double &met_phi, const double &met_set);
    const double significance(double& met_r, double& met_phi, double& met_set);
    const void addObjects(const std::vector<metsig::SigInputObj>& EventVec);
    const void subtractObjects(const std::vector<metsig::SigInputObj>& EventVec);
    TMatrixD getSignifMatrix() const {return signifmatrix_;}
    //    const std::vector<metsig::SigInputObj> eventVec(){return eventVec_;}
  private:
    void rotateMatrix( Double_t theta, TMatrixD &v);  

    //    std::vector<metsig::SigInputObj> eventVec_;
    TMatrixD signifmatrix_;
    // workers:
    double set_worker_;
    double xmet_;
    double ymet_;
  };
}

#endif