/* ======================================================================== *\
!
! *
! * This file is part of MARS, the MAGIC Analysis and Reconstruction
! * Software. It is distributed to you in the hope that it can be a useful
! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
! * It is distributed WITHOUT ANY WARRANTY.
! *
! * Permission to use, copy, modify and distribute this software and its
! * documentation for any purpose is hereby granted without fee,
! * provided that the above copyright notice appear in all copies and
! * that both that copyright notice and this permission notice appear
! * in supporting documentation. It is provided "as is" without express
! * or implied warranty.
! *
!
!
!   Author(s): Thomas Bretz  12/2000 <mailto:tbretz@astro.uni-wuerzburg.de>
!
!   Copyright: MAGIC Software Development, 2000-2004
!
!
\* ======================================================================== */

//////////////////////////////////////////////////////////////////////////////
//                                                                          //
//  MRawFileRead                                                            //
//                                                                          //
//  This tasks reads the raw binary file like specified in the TDAS???      //
//  and writes the data in the corresponding containers which are           //
//  either retrieved from the parameter list or created and added.          //
//                                                                          //
//  Input Containers:                                                       //
//   -/-                                                                    //
//                                                                          //
//  Output Containers:                                                      //
//   MRawRunHeader, MRawEvtHeader, MRawEvtData, MRawCrateArray, MRawEvtTime //
//                                                                          //
//////////////////////////////////////////////////////////////////////////////

#include "MRawFileRead.h"

#include <fstream>

#include "MLog.h"
#include "MLogManip.h"

#include "MTime.h"
#include "MParList.h"
#include "MRawRunHeader.h"
#include "MRawEvtHeader.h"
#include "MRawEvtData.h"
#include "MRawCrateData.h"
#include "MRawCrateArray.h"

ClassImp(MRawFileRead);

using namespace std;

/*  ----------- please don't delete and don't care about (Thomas) ------------
#define kBUFSZ 64 //1024*1024*64
#include <iomanip.h>
class bifstream : public istream, public streambuf
{
private:
    char fBuffer[kBUFSZ]; //!
    FILE *fd;

    int sync()
    {
        memset(fBuffer, 0, kBUFSZ);
        return 0; 
    }
    int underflow()
    {
        int sz=fread(fBuffer, kBUFSZ, 1, fd);
        //int sz=fread(fBuffer, 1, kBUFSZ, fd);
        setg(fBuffer, fBuffer, fBuffer+kBUFSZ);

        return sz==1 ? *(unsigned char*)fBuffer : EOF;//EOF;
        //return sz==kBUFSZ ? *(unsigned char*)fBuffer : EOF;//EOF;
    }
public:
    bifstream(const char *name) : istream(this)
    {
        fd = fopen(name, "rb");
        setbuf(fBuffer, kBUFSZ);
    }
};
*/

// --------------------------------------------------------------------------
//
// Default constructor. It tries to open the given file.
//
MRawFileRead::MRawFileRead(const char *fname, const char *name, const char *title)
    : fFileName(fname), fIn(NULL)
{
    fName  = name  ? name  : "MRawFileRead";
    fTitle = title ? title : "Read task to read DAQ binary files";

    fIn = new ifstream;
}

// --------------------------------------------------------------------------
//
// Destructor. Delete input stream.
//
MRawFileRead::~MRawFileRead()
{
    delete fIn;
}

// --------------------------------------------------------------------------
//
// The PreProcess of this task checks for the following containers in the
// list:
//   MRawRunHeader <output>   if not found it is created
//   MRawEvtHeader <output>   if not found it is created
//   MRawEvtData <output>     if not found it is created
//   MRawCrateArray <output>  if not found it is created
//   MRawEvtTime <output>     if not found it is created (MTime)
//
// If all containers are found or created the run header is read from the
// binary file and printed.  If the Magic-Number (file identification)
// doesn't match we stop the eventloop.
//
// Now the EvtHeader and EvtData containers are initialized.
//
Int_t MRawFileRead::PreProcess(MParList *pList)
{
    //
    // open the input stream
    // first of all check if opening the file in the constructor was
    // successfull
    //
    fIn->open(fFileName);
    if (!(*fIn))
    {
        *fLog << err << "Error: Cannot open file '" << fFileName << "'" << endl;
        return kFALSE;
    }

    if (!MRawRead::PreProcess(pList))
        return kFALSE;

    //
    // Read RUN HEADER (see specification) from input stream
    //
    if (!fRawRunHeader->ReadEvt(*fIn))
        return kFALSE;

    if (!(*fIn))
    {
        *fLog << err << "Error: Accessing file '" << fFileName << "'" << endl;
        return kFALSE;
    }
    //if (fRawRunHeader->GetMagicNumber()!=kMagicNumber)
    //    return kFALSE;

    fRawRunHeader->Print();

    *fRawEvtTime = fRawRunHeader->GetRunStart();

    //
    // Give the run header information to the 'sub-classes'
    // Run header must be valid!
    //
    fRawEvtHeader->Init(fRawRunHeader, fRawEvtTime);
    fRawEvtData  ->Init(fRawRunHeader, fRawCrateArray);

    return kTRUE;
}

// --------------------------------------------------------------------------
//
// The Process reads one event from the binary file:
//  - The event header is read
//  - the run header is read
//  - all crate information is read
//  - the raw data information of one event is read
//
Int_t MRawFileRead::Process()
{
    return ReadEvent(*fIn);
}

// --------------------------------------------------------------------------
//
//  Close the file. Check whether the number of read events differs from
//  the number the file should containe (MRawRunHeader). Prints a warning
//  if it doesn't match.
//
Int_t MRawFileRead::PostProcess()
{
    fIn->close();

    //
    // Sanity check for the number of events
    //
    if (fRawRunHeader->GetNumEvents()==GetNumExecutions()-1 || GetNumExecutions()==0)
        return kTRUE;

    *fLog << warn << dec;
    *fLog << "Warning - number of read events (" << GetNumExecutions()-1;
    *fLog << ") doesn't match number in run header (";
    *fLog << fRawRunHeader->GetNumEvents() << ")." << endl;

    return kTRUE;
}