#ifndef _io_SenecaFileParser_h_
#define _io_SenecaFileParser_h_

#include <fstream>
#include <string>
#include <io/IoCodes.h>

using namespace std;


namespace io {

  enum SenecaHadronicSim {
    eSenecaUnknown = 0,
    eSenecaQGS98 = 1,
    eSenecaQGS01 = 2,
    eSenecaSib21 = 3,
    eSenecaNex2 = 4,
    eSenecaNex397 = 5
  };

  enum SenecaEMSim {
    eSenecaGheisha = 1,
    eSenecaGFluka = 2,
    eSenecaGCalor = 3,
    eSenecaURQMD = 4
  };

  struct SenecaParticleRecord {
    int ID;
    float Weight;
    float X;
    float Y;
    float T;
    float Px;
    float Py;
    float Pz;
  };

  struct SenecaHeaderRecord {
    int ID;	
    float SenecaVersion;
    unsigned char EMSim;
    unsigned char HadronicSim;
    float HObs;
    int ILowHadr;
    int IOHadr;
    int IVersion;
    float HINJ;
    float HGround;
    float HCore;
  };

  struct SenecaEventHeaderRecord {
    int ID;	
    float E0;
    float Theta;
    float Phi;
    int ID0;
  };
	

  /**
    \class SenecaFileParser
    \brief 
   
    \author Jeff Allen
    \date 8 Sep 2006
    \ingroup seneca
  */

  class SenecaFileParser {
  public:
    SenecaFileParser(const std::string& FileName, const Mode mode = eRead);
    SenecaFileParser();
    ~SenecaFileParser();
		
    Status OpenSenecaFile(const std::string& FileName, Mode mode = eRead);
    void CloseSenecaFile();
    unsigned int GetCurrentPosition();
		
    Status ProcessFile();
    SenecaHeaderRecord* GetFileHeader();
    SenecaEventHeaderRecord* GetCurrentEventHeader();
    SenecaParticleRecord* GetParticleRecord();
    Status GotoPosition(unsigned int thePosition);
    unsigned int GetPosition();
    Status GotoEvent(unsigned int theEventNumber);
    Status GetNextEvent();
    Status ReadParticle();
    unsigned int GetNumberEvents();
    unsigned int GetCurrentEvent();
    Status FileStatus();
		
    bool FileHeaderValid;
    bool EventHeaderValid;
    bool ParticleRecordValid;
	
  private:
    Status DecodeFileHeader(unsigned char* Record);
    Status DecodeEventHeader(unsigned char* Record);
    Status DecodeParticleRecord(unsigned char* Record);
	
    int SenecaDecodeInt(unsigned char* Buffer);
    float SenecaDecodeFloat(unsigned char* Buffer);
		
    std::ifstream SenecaFile;
    string SenecaFileName;
    //std::ofstream DebugFile;
		
    unsigned long EventPositions[1024];
		
    SenecaEventHeaderRecord EventHeader;
    SenecaHeaderRecord FileHeader;
    SenecaParticleRecord ParticleRecord;
		
    bool FileOpen;
		
    unsigned int NumberEvents;
    unsigned int CurrentEvent, NextEvent;
		
    unsigned int FileSize;
    unsigned long CurrentPosition;
    unsigned int FirstEvent;
  };

} //io namespace

#endif //io_SenecaFileParser_h_