/* ======================================================================== *\
!
! *
! * 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): Markus Gaug  09/2003 <mailto:markus@ifae.es>
!
!   Copyright: MAGIC Software Development, 2000-2001
!
!
\* ======================================================================== */

//////////////////////////////////////////////////////////////////////////////
//                                                                          //
//   MCalibrationCalc                                                       //
//                                                                          //
//   This is a task which calculates the number of photons from the FADC    //
//   time slices. At the moment it integrates simply the FADC values.       //
//                                                                          //
//  Input Containers:                                                       //
//   MRawEvtData                                                            //
//                                                                          //
//  Output Containers:                                                      //
//   MCalibrationCam                                                        //
//                                                                          //
//                                                                          //
//  The class MCalibrationCam hold one entry of type MCalibrationPix for    //
//  every pixel. It is filled in the following way:                         //
//  PreParocess: MalibrationCam::InitSize(577) is called which allocates    //
//               memory in an TClonesArray of type MCalibrationPix and      //
//               all pointers to NULL.                                      //
//                                                                          //
//  Process:     The NULL pointer is tested on every pixel via              //
//               MalibrationCam::IsPixelUsed(npix).                         //
//                                                                          //
//               In case, IsPixelUsed returns NULL,                         //
//               MalibrationCam::AddPixel(npix) is invoked which creates a  //
//               new MCalibrationPix(npix) in the npix's entry              //
//               of the TClonesArray.                                       //
//                                                                          //
//               Every MCalibrationPix holds a histogram class,             //
//               MHCalibrationPixel which itself hold histograms of type:   //
//               HQ(npix) (distribution of summed FADC time slice entries)  //
//               HT(npix) (distribution of position of maximum)             //
//               HQvsN(npix) (distribution of charges vs. event number.     //
//                                                                          //
// PostProcess:  All histograms HQ(npix) are fitted to a Gaussian           //
//               All histograms HT(npix) are fitted to a Gaussian           //
//               The histogram HBPQ (blind pixel) is fitted to a single     //
//                   PhE fit                                                //
//               The histogram HBPT (blind pixel) is fitted to a Gaussian   //
//               The histograms of the PIN Diode are fitted to Gaussians    //
//                                                                          //
//               Fits can be excluded via the commands:                     //
//               MalibrationCam::SetSkipTFits()   (skip all time fits)      //
//               MalibrationCam::SetSkipBPFits()  (skip all blind pixel fits) //
//               MalibrationCam::SetSkipPDFits()  (skip all PIN Diode fits) //
//                                                                          //
//////////////////////////////////////////////////////////////////////////////

#include "MCalibrationCalc.h"
#include "MCalibrationConfig.h"
#include "MCalibrationFits.h"

#include "MCalibrationCam.h"
#include "MCalibrationPix.h"
#include "MCalibrationBlindPix.h"
#include "MCalibrationPINDiode.h"

#include "MPedestalCam.h"
#include "MPedestalPix.h"

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

#include "MParList.h"
#include "MH.h"

#include "MRawRunHeader.h"
#include "MRawEvtData.h"       // MRawEvtData::GetNumPixels
#include "MRawEvtPixelIter.h"

#include "MTime.h"

ClassImp(MCalibrationCalc);

using namespace std;
// --------------------------------------------------------------------------
//
// Default constructor. b is the number of slices before the maximum slice,
// a the number of slices behind the maximum slice which is taken as signal.
//
MCalibrationCalc::MCalibrationCalc(const char *name, const char *title)
    : fColor(kEBlue)
{

    fName  = name  ? name  : "MCalibrationCalc";
    fTitle = title ? title : "Task to calculate the calibration constants and MCalibrationCam ";

    AddToBranchList("MRawEvtData.fHiGainPixId");
    AddToBranchList("MRawEvtData.fLoGainPixId");
    AddToBranchList("MRawEvtData.fHiGainFadcSamples");
    AddToBranchList("MRawEvtData.fLoGainFadcSamples");

    SETBIT(fFlags, kUseTFits);
    SETBIT(fFlags, kUseBPFit);
    SETBIT(fFlags, kUsePDFit);
}

// --------------------------------------------------------------------------
//
// The PreProcess searches for the following input containers:
//  - MRawEvtData
//  - MPedestalCam
//
// The following output containers are also searched and created if
// they were not found:
//
//  - MHCalibrationBlindPixel
//  - MCalibrationCam
//  - MTime
//
Int_t MCalibrationCalc::PreProcess(MParList *pList)
{

    fOverFlow = 0;
    fNrEvents = 0;

    fRawEvt = (MRawEvtData*)pList->FindObject("MRawEvtData");
    if (!fRawEvt)
    {
        *fLog << dbginf << "MRawEvtData not found... aborting." << endl;
        return kFALSE;
    }

    const MRawRunHeader *runheader = (MRawRunHeader*)pList->FindObject("MRawRunHeader");
    if (!runheader)
        *fLog << warn << dbginf << "Warning - cannot check file type, MRawRunHeader not found." << endl;
    else
        if (runheader->GetRunType() == kRTMonteCarlo)
        {
            return kTRUE;
        }

    fCalibrations = (MCalibrationCam*)pList->FindCreateObj("MCalibrationCam");
    if (!fCalibrations)
      {
        *fLog << err << dbginf << "MCalibrationCam could not be created ... aborting." << endl;        
        return kFALSE;
      }

    //
    // fRawEvt->GetNumPixels() does not work !!!!!!!!!!
    //
    fCalibrations->InitSize(577);

    switch (fColor)
      {
      case kEBlue:
        fCalibrations->SetColor(MCalibrationCam::kECBlue);
      break;        
      case kEGreen:
        fCalibrations->SetColor(MCalibrationCam::kECGreen);      
      break;
      case kEUV:
        fCalibrations->SetColor(MCalibrationCam::kECUV);            
      }



    fPedestals = (MPedestalCam*)pList->FindObject("MPedestalCam");
    if (!fPedestals)
      {
        *fLog << err << dbginf << "Cannot find MPedestalCam ... aborting" << endl;
        return kFALSE;
      }
    

    // MTime does not work!!!!

    //    fEvtTime = (MTime*)pList->FindObject("MRawEvtTime");
    //    if (!fEvtTime)
    //      {
    //        *fLog << dbginf << "MTime could not be created ... ¡!¡!¡!¡!" << endl;        
    //      }
    
    // fEvtTime->SetTime(0.);

    
    return kTRUE;
}


// --------------------------------------------------------------------------
//
// The ReInit searches for the following input containers:
//  - MRawRunHeader
//
Bool_t MCalibrationCalc::ReInit(MParList *pList )
{
 
    fRunHeader = (MRawRunHeader*)pList->FindObject("MRawRunHeader");
    if (!fRunHeader)
    {
        *fLog << dbginf << "MRawRunHeader not found... aborting." << endl;
        return kFALSE;
    }

    fNumHiGainSamples =  fRunHeader->GetNumSamplesHiGain();
    fNumLoGainSamples =  fRunHeader->GetNumSamplesLoGain();
 
    return kTRUE;
 
}


// --------------------------------------------------------------------------
//
// Calculate the integral of the FADC time slices and store them as a new
// pixel in the MCerPhotEvt container.
//
Int_t MCalibrationCalc::Process()
{

    fNrEvents++;

    MCalibrationBlindPix &blindpixel = *(fCalibrations->GetBlindPixel());
    MCalibrationPINDiode &pindiode   = *(fCalibrations->GetPINDiode());

    MRawEvtPixelIter pixel(fRawEvt);

    while (pixel.Next())
      {

        UShort_t sat = 0;
        const Int_t pixid = pixel.GetPixelId();

        if (!fCalibrations->IsPixelUsed(pixid))
          if (!fCalibrations->AddPixel(pixid)) 
            *fLog << err << dbginf << "MCalibrationPix(" << pixid << ") could not be created !!" << endl;
        
        Byte_t *ptr = pixel.GetHiGainSamples();
        Byte_t mid  = pixel.GetIdxMaxHiGainSample();
        UInt_t max  = pixel.GetMaxHiGainSample();

        Int_t sum = (max > gkSaturationLimit              // overflow ?
                     ? sat++, pixel.GetSumLoGainSamples() // take Low Gain
                     : pixel.GetSumHiGainSamples());      // no overflow

        if (sat)
          {

            ptr = pixel.GetLoGainSamples();
            max = pixel.GetMaxLoGainSample();
            mid = pixel.GetIdxMaxLoGainSample();

            sum = (max == gkSaturationLimit          // overflow of LoGain ??? -> GimmeABreak!!!
                   ? fOverFlow++, gkLoGainOverFlow   // OUCH (Florian was maybe right)
                   : sum*gkConversionHiLo    );      // OUFF (Florian was wrong) !! 

            //            *fLog << warn << "Warning: Saturation of HiGain reached in slice " << (int)mid << " !!! " << endl;
            //            *fLog << warn << "Max = " << max << endl;

            if (fOverFlow) 
              *fLog << err << dbginf << "Warning: Saturation of LoGain reached! " 
                    << err << dbginf << "sum = " << sum << endl;

          }
        
        //
        // sanity check (old MC files sometimes have pixids>577)
        //
        if (fPedestals && !fPedestals->CheckBounds(pixid))
          {
            *fLog << inf << "Pixel ID larger than camera... skipping event." << endl;
            return kCONTINUE;
              }
        
        MPedestalPix    &ped = (*fPedestals)[pixid];
        MCalibrationPix &pix = (*fCalibrations)[pixid];
        
        Float_t pedes = ped.GetPedestal();
        
        //
        // FIXME: This is preliminary, we will change to pedestals per slice!!!
        // Assume pedestals per time slice ==> multiply with number of slices
        //
        pedes *= (sat ? fNumLoGainSamples : fNumHiGainSamples );

        Float_t rsum      = (float)sum - pedes;
        
        switch(pixid)
          {
            
          case gkCalibrationBlindPixelId:
            if (!blindpixel.FillQ(sum)) 
              *fLog << warn << 
                "Overflow or Underflow occurred filling Blind Pixel means = " << sum << endl;
            if (!blindpixel.FillT((int)mid)) 
              *fLog << warn << 
                "Overflow or Underflow occurred filling Blind Pixel time = " << (int)mid << endl;
            if (!blindpixel.FillRQvsT(rsum,fNrEvents))
              *fLog << warn << 
                "Overflow or Underflow occurred filling Blind Pixel eventnr = " << fNrEvents << endl;

          case gkCalibrationPINDiodeId:
            if (!pindiode.FillQ(sum)) 
              *fLog << warn << 
                "Overflow or Underflow occurred filling HQ: means = " << sum << endl;
            if (!pindiode.FillT((int)mid)) 
              *fLog << warn << 
                "Overflow or Underflow occurred filling HT: time = " << (int)mid << endl;
            if (!pindiode.FillRQvsT(rsum,fNrEvents))
              *fLog << warn << 
                "Overflow or Underflow occurred filling HQvsN: eventnr = " << fNrEvents << endl;

          default:

            if (!pix.FillQ(sum))
              *fLog << warn << "Could not fill Q of pixel: " << pixid 
                    << " signal = " << sum << endl;

            //
            // Fill the reduced charge into the control histo for better visibility
            //
            if (!pix.FillRQvsT(rsum,fNrEvents))
              *fLog << warn << "Could not fill red. Q vs. EvtNr of pixel: " << pixid 
                    << " signal = " << rsum  << " event Nr: " << fNrEvents << endl;


            if (!pix.FillT((int)mid)) 
            *fLog << warn << "Could not fill T of pixel: " << pixid << " time = " << (int)mid << endl;


          } /* switch(pixid) */

      } /* while (pixel.Next()) */

    fCalibrations->SetReadyToSave();
    
    return kTRUE;
}

Int_t MCalibrationCalc::PostProcess()
{

  *fLog << inf << endl;
  *fLog << GetDescriptor() << " Cut Histogram Edges" << endl;
  //
  // Cut edges to make fits and viewing of the hists easier  
  //
  fCalibrations->CutEdges();

  //
  // Get pointer to blind pixel
  //
  MCalibrationBlindPix &blindpixel = *(fCalibrations->GetBlindPixel());

  *fLog << GetDescriptor() << " Fitting the Blind Pixel" << endl;

  // 
  // Fit the blind pixel
  //
  if (TESTBIT(fFlags,kUseBPFit))
    {
      if (!blindpixel.FitQ()) 
        *fLog << err << dbginf << "Could not fit the blind pixel " << endl;
      
      if (!blindpixel.FitT())
        *fLog << warn << "Could not the Times of the blind pixel " << endl;

      blindpixel.Draw();

    }

  *fLog << GetDescriptor() << " Fitting the Normal Pixels" << endl;
  //
  // loop over the pedestal events and check if we have calibration
  //
  for (Int_t pixid=0; pixid<fPedestals->GetSize(); pixid++)
    {

      if (fCalibrations->IsPixelUsed(pixid))
        {

          MCalibrationPix &pix = (*fCalibrations)[pixid];


          if (TESTBIT(fFlags,kUseTFits))
            pix.FitT();

          if (!pix.FitQ())
             continue;

          const Float_t ped    = (*fPedestals)[pixid].GetPedestal();
          const Float_t prms   = (*fPedestals)[pixid].GetPedestalRms();
          pix.SetPedestal(ped,prms);
        }
    }

  fCalibrations->SetReadyToSave();
  
  if (GetNumExecutions()==0 || fOverFlow==0)
    return kTRUE;
  
  *fLog << inf << endl;
  *fLog << GetDescriptor() << " execution statistics:" << endl;
  *fLog << dec << setfill(' ');
  *fLog << " " << setw(7) << fOverFlow << " (" << setw(3) << (int)(fOverFlow*100/GetNumExecutions()) << "%) Evts skipped due to: lo gain saturated." << endl;
  
  return kTRUE;
}
