/*
 *  Delphes: a framework for fast simulation of a generic collider experiment
 *  Copyright (C) 2012-2014  Universite catholique de Louvain (UCL), Belgium
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef DelphesLHEFReader_h
#define DelphesLHEFReader_h

/** \class DelphesLHEFReader
 *
 *  Reads LHEF file
 *
 *  \author P. Demin - UCL, Louvain-la-Neuve
 *
 */

#include <stdio.h>

#include <utility>
#include <vector>

class TObjArray;
class TStopwatch;
class TDatabasePDG;
class ExRootTreeBranch;
class DelphesFactory;

class DelphesLHEFReader
{
public:
  DelphesLHEFReader();
  ~DelphesLHEFReader();

  void SetInputFile(FILE *inputFile);

  void Clear();
  bool EventReady();

  bool ReadBlock(DelphesFactory *factory,
    TObjArray *allParticleOutputArray,
    TObjArray *stableParticleOutputArray,
    TObjArray *partonOutputArray);

  void AnalyzeEvent(ExRootTreeBranch *branch, long long eventNumber,
    TStopwatch *readStopWatch, TStopwatch *procStopWatch);

  void AnalyzeWeight(ExRootTreeBranch *branch);

private:
  void AnalyzeParticle(DelphesFactory *factory,
    TObjArray *allParticleOutputArray,
    TObjArray *stableParticleOutputArray,
    TObjArray *partonOutputArray);

  FILE *fInputFile;

  char *fBuffer;

  TDatabasePDG *fPDG;

  bool fEventReady;

  int fEventCounter;

  int fParticleCounter, fProcessID;
  double fCrossSection, fWeight, fScalePDF, fAlphaQCD, fAlphaQED;

  int fPID, fStatus, fM1, fM2, fC1, fC2;
  double fPx, fPy, fPz, fE, fMass;

  std::vector<std::pair<int, double>> fWeightList;
};

#endif // DelphesLHEFReader_h