/*
 *  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 DelphesSTDHEPReader_h
#define DelphesSTDHEPReader_h

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

#include <stdint.h>
#include <stdio.h>

#include "classes/DelphesXDRReader.h"

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

class DelphesSTDHEPReader
{
public:
  enum STDHEPBlock
  {
    GENERIC = 0,
    FILEHEADER = 1,
    EVENTTABLE = 2,
    EVENTHEADER = 4,
    MCFIO_STDHEP = 101,
    MCFIO_STDHEPBEG = 106,
    MCFIO_STDHEPEND = 107,
    MCFIO_STDHEP4 = 201
  };

  DelphesSTDHEPReader();
  ~DelphesSTDHEPReader();

  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);

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

  void SkipBytes(int size);
  void SkipArray(int elsize);

  void ReadFileHeader();
  void ReadEventTable();
  void ReadEventHeader();
  void ReadSTDCM1();
  void ReadSTDHEP();
  void ReadSTDHEP4();

  FILE *fInputFile;

  DelphesXDRReader fReader[7];

  uint8_t *fBuffer;

  TDatabasePDG *fPDG;

  uint32_t fEntries;
  int32_t fBlockType, fEventNumber, fEventSize;
  double fWeight, fAlphaQCD, fAlphaQED;

  uint32_t fScaleSize;
  double fScale[10];
};

#endif // DelphesSTDHEPReader_h