/* Data organisation on disk:

                      Board 1      Board 2      ...     Board 1      Board 2      ...
   RH  BS1 BS2 ... EH C1 C2 C3 ... C1 C2 C3 ... ...  EH C1 C2 C3 ... C1 C2 C3 ... ...
                   --------------------------------  --------------------------------
                   Event 1                           Event 2

  RH Run header   BSx Board structures   EV Event header   Cx Channel (0-19 for 2 chips)
  Channel data are written as shorts, lenght of channel data is in the run header

  Structures are defined using #pragma pack (1) to not include any padding. Note that
  using the gcc attribute __attribute__((__packed__)) is incompatible with root.
*/

#ifndef RAWDATACTX_H_SEEN
#define RAWDATACTX_H_SEEN

#include <stdio.h>

#define DATA_FORMAT 1

typedef char I8;
typedef unsigned char U8;
typedef short I16;
typedef unsigned short U16;
typedef int I32;
typedef unsigned int U32;
typedef float F32;

#define MAGICNUM_OPEN 0xe0e1    // Magic number for run header while file open
#define MAGICNUM_CLOSED 0xe0e0  //    ... and when file is closed
#define MAGICNUM_ERROR 0xe0e2   //    ... and when an error occurred

// Error codes
enum CTX_ErrCode {CTX_OK, CTX_FOPEN, CTX_FCLOSE, CTX_NOTOPEN, CTX_RHEADER,
    	    	  CTX_BSTRUCT, CTX_EHEADER, CTX_DATA, CTX_SEEK, CTX_EOF};

#pragma pack (1)  // Switch padding off

// Run header
typedef struct {
  U32 MagicNum;
  U32 DataFormat;       // Increasing whenever header format changes

  U32 RunHeaderSize;
  U32 EventHeaderSize;
  U32 BoardStructureSize;

  I8  DAQVersion[12]; 	// contains result of __DATE__ macro

  I8  Source[16];
  I8  Type;          // run type (char): pedestal, data, ...

  U32 RunNumber;
  U32 FileNumber;
  
  U32 StartYear;
  U32 StartMonth;
  U32 StartDay;
  U32 StartHour;
  U32 StartMinute;
  U32 StartSecond;
  
  U32 EndYear;
  U32 EndMonth;
  U32 EndDay;
  U32 EndHour;
  U32 EndMinute;
  U32 EndSecond;

  F32 SourceRA;
  F32 SourceDEC;
  F32 TelescopeRA;
  F32 TelescopeDEC;
  
  U32 Events;                     // Number of events in the file 
  U32 NCMCBoards;                 // Number of used boards
  U32 NChips;			  // Number of DRS chips per board
  U32 NChannels;		  // Number of channels per chip
  U32 Samples;                    // Number of samples
  I32 Offset;                     // Offset from first sample
} RunHeader;

// Board structure
typedef struct {
  I32 SerialNo;    // Board serial number
  F32 NomFreq;     // Nominal sampling frequency [GHz]
  F32 BoardTemp;   // Board temperature [deg C]
  F32 ScaleFactor; // Factor for conversion to mV 
} BoardStructure;

// Event header
typedef struct {
  I8  Name[5];          // "EVTH", NULL-terminated
  U32 EventNumber;
  F32 TimeSec;          // event time stamp in seconds, ms precision
  U16 TriggerType;
} EventHeader;

#pragma pack ()     // Set default padding

// Class definition
class RawDataCTX {
    FILE *Rawfile;
    bool FileOpen;
    bool Silent;
    
  public:
    RunHeader   *RHeader; 
    EventHeader *EHeader;
    BoardStructure *BStruct;
    short *Data; 

    RawDataCTX(bool = false);
    ~RawDataCTX();
    
    CTX_ErrCode OpenDataFile(char*, FILE* = NULL);
    CTX_ErrCode CloseDataFile();
    CTX_ErrCode ReadEvent(int = 0, FILE* = NULL);
    bool IsFileOpen();
};
#endif