#ifndef __ANTARESDAQ__FRAMEPREAMBLE__
#define __ANTARESDAQ__FRAMEPREAMBLE__

/**
 *  @file	FramePreamble.hh
 *  @author	Joris van Rantwijk
 *  @date	Feb 2002
 *
 *  Class definition for Antares DAQ Data-Frame Preamble.
 */

#include <ostream>
#include <iomanip>

#include <TROOT.h>
#include <TObject.h>

#include "antares-dataformat/ulonglong.hh"

/**
 *  This object holds the information from the 'preamble' of a data frame.
 */
class DaqFramePreamble { 
public:
  
  /** Total length of the frame in 4-byte words. */
  unsigned int       frameSize;
  
  /** Data type code (DAQ_xxx) */
  unsigned short     dataType;
  
  /** Unique code representing the shore station for this frame */
  unsigned short     frameTarget;
  
  /** Frame 'time stamp' in units of 50ns (MSW) */
  unsigned int       frameTime1;
  /** Frame 'time stamp' in units of 50ns (LSW) */
  unsigned int       frameTime2;
  /** \return 64 bit frame time */
  ulonglong          frameTime()
  {
    return ulonglong(frameTime1,frameTime2);
  }

  /** Number of frames since start of the run */
  unsigned int       frameIndex;
  
  /** Status of frame Xon/Xoff */
  unsigned short     status;
  
  /** Number of items actually sent in this frame */
  unsigned short     nbItems;
  
  /** ID of originating LCM */
  unsigned short     LCM_ID;
  
  /** ID of originating ARS */
  unsigned short     ARS_ID;
  
  /** Run-number as given by the RunControl */
  unsigned int       runNumber;

  /**
   * get LCM idendifier
   * \return       LCM identifier
   */
  const unsigned short lcm_id() const { return LCM_ID; }

  /**
   * get ARS idendifier
   * \return       ARS identifier
   */
  const unsigned short ars_id() const { return ARS_ID; }

  /**
   * get data type
   * \return       data type
   */
  const unsigned short data_type() const { return dataType; }

  /**
   * get number of items
   * \return       number of items
   */
  const unsigned short numberOfItems() const { return nbItems; }

  /**
   *  Return a pointer to the frame data buffer.
   *  The returned value points to the start of the frame preamble.
   * \return pointer to data
   */
  virtual const unsigned char* getdata() const { return NULL; }

  /**
   *  Return the length of the frame data buffer.
   *  The returned value is in <b>bytes</b> (not words), and includes
   *  the frame preamble.
   * \return length of data
   */
  virtual const unsigned int getdatalen() const { return Length(); }

  /** Construct an empty preamble object. */
  DaqFramePreamble() { };
  
  /**
   * destructor
   */
  virtual ~DaqFramePreamble() {};

  /** Return length of an encoded frame preamble in bytes. */
  static const unsigned int Length() { return 32; }

  /**
   * Print ASCII.
   *
   * \param  out     output stream
   * \param  object  frame preamble
   * \return         output stream
   */
  friend std::ostream& operator<<(std::ostream& out, const DaqFramePreamble& object)
  {
    using namespace std;
    
    out << "frameSize   " << object.frameSize   << endl;
    out << "dataType    " << object.dataType    << endl;
    out << "frameTarget " << object.frameTarget << endl;
    out << "frameTime1  " << object.frameTime1  << endl;
    out << "frameTime2  " << object.frameTime2  << endl;
    out << "frameIndex  " << object.frameIndex  << endl;
    out << "status      " << object.status      << endl;
    out << "nbItems     " << object.nbItems     << endl;
    out << "LCM_ID      " << object.LCM_ID      << endl;
    out << "ARS_ID      " << object.ARS_ID      << endl;
    out << "runNumber   " << object.runNumber   << endl;

    return out;
  }       

  ClassDef(DaqFramePreamble, 2);
};        


/**
 * equal operator for DAQ frame preamble
 *
 * \param  first    DAQ frame preamble
 * \param  second   DAQ frame preamble
 * \return          true if first equals second; else false
 */
static inline const bool operator==(const DaqFramePreamble& first, const DaqFramePreamble& second)
{
  return (first.dataType   == second.dataType   &&
	  first.frameIndex == second.frameIndex &&
	  first.LCM_ID     == second.LCM_ID     &&
	  first.ARS_ID     == second.ARS_ID     &&
	  first.runNumber  == second.runNumber);
}

/**
 * not-equal operator for DAQ frame preamble
 *
 * \param  first    DAQ frame preamble
 * \param  second   DAQ frame preamble
 * \return          true if first not equals second; else false
 */
static inline const bool operator!=(const DaqFramePreamble& first, const DaqFramePreamble& second)
{
  return (first.dataType   != second.dataType   ||
	  first.frameIndex != second.frameIndex ||
	  first.LCM_ID     != second.LCM_ID     ||
	  first.ARS_ID     != second.ARS_ID     ||
	  first.runNumber  != second.runNumber);
}
          
#endif

/* End */