/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *    
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  * 
 **************************************************************************/

/* $Id$ */

//_________________________________________________________________________//
//                                                                         //
//  TOF sdigit: member variables                                           //
//  fSector  : TOF sector                                                  //
//  fPlate   : TOF plate                                                   //
//  fStrip   : strips number                                               //
//  fPadx    : pad number along x                                          //
//  fPadz    : pad number along z                                          //
//  fTdc     : TArrayI of TDC values                                       //
//  fAdc     : TArrayI of ADC values                                       //
//                                                                         //
//  Getters, setters and member functions  defined here                    //
//                                                                         //
// -- Authors: F. Pierella, A. Seganti, D. Vicinanza                       //
//_________________________________________________________________________//

#include "AliLog.h"

#include "AliTOFGeometry.h"
#include "AliTOFSDigit.h"

ClassImp(AliTOFSDigit)

////////////////////////////////////////////////////////////////////////
AliTOFSDigit::AliTOFSDigit():
  fSector(-1),
  fPlate(-1),
  fStrip(-1),
  fPadx(-1),
  fPadz(-1),
  fNDigits(0),
  fTdc(0x0),
  fAdc(0x0),
  fTracks(0x0)
{
  //
  // default ctor
  //
}

////////////////////////////////////////////////////////////////////////
AliTOFSDigit::AliTOFSDigit(Int_t tracknum, Int_t * const vol,Int_t * const digit):
  TObject(),
  fSector(-1),
  fPlate(-1),
  fStrip(-1),
  fPadx(-1),
  fPadz(-1),
  fNDigits(0),
  fTdc(0x0),
  fAdc(0x0),
  fTracks(0x0)
{
  //
  // Constructor of digit object
  //

  fSector = vol[0];
  fPlate  = vol[1];
  fStrip  = vol[2];
  fPadx   = vol[3];
  fPadz   = vol[4];
  fNDigits = 1;
  fTdc = new TArrayI(fNDigits);
  (*fTdc)[0] = digit[0];
  fAdc = new TArrayI(fNDigits);
  (*fAdc)[0] = digit[1];
  fTracks = new TArrayI(kMAXDIGITS*fNDigits);
  (*fTracks)[0] = tracknum;
  for (Int_t i = 1; i <kMAXDIGITS*fNDigits; i++) {
    (*fTracks)[i] = -1;
  }
}

////////////////////////////////////////////////////////////////////////
AliTOFSDigit::AliTOFSDigit(const AliTOFSDigit & digit):
  TObject(digit),
  fSector(digit.fSector),
  fPlate(digit.fPlate),
  fStrip(digit.fStrip),
  fPadx(digit.fPadx),
  fPadz(digit.fPadz),
  fNDigits(digit.fNDigits),
  fTdc(0x0),
  fAdc(0x0),
  fTracks(0x0)
{
  // 
  // copy ctor for AliTOFSDigit object
  //
  fTdc = new TArrayI(*digit.fTdc);  
  fAdc = new TArrayI(*digit.fAdc);
  fTracks = new TArrayI(*digit.fTracks);
}

////////////////////////////////////////////////////////////////////////
AliTOFSDigit& AliTOFSDigit::operator=(const AliTOFSDigit & digit)
{
  // 
  // copy ctor for AliTOFSDigit object
  //

  if (this == &digit)
    return *this;

  TObject::operator=(digit);
  fSector = digit.fSector;
  fPlate  = digit.fPlate;
  fStrip  = digit.fStrip;
  fPadx   = digit.fPadx;
  fPadz   = digit.fPadz;
  fNDigits = digit.fNDigits;
  fTdc = digit.fTdc;
  fAdc = digit.fAdc;
  fTracks = digit.fTracks;
  return *this;

}

////////////////////////////////////////////////////////////////////////
AliTOFSDigit::AliTOFSDigit(Int_t sector, Int_t plate, Int_t strip, Int_t padx,
			   Int_t padz, Int_t tdc, Int_t adc):
  fSector(sector),
  fPlate(plate),
  fStrip(strip),
  fPadx(padx),
  fPadz(padz),
  fNDigits(1),
  fTdc(0x0),
  fAdc(0x0),
  fTracks(0x0)
{
  //
  // Constructor for sdigit
  //
  fTdc = new TArrayI(fNDigits);
  (*fTdc)[0] = tdc;   
  fAdc = new TArrayI(fNDigits);
  (*fAdc)[0] = adc;   
  // no tracks were specified, set them to -1
  fTracks = new TArrayI(kMAXDIGITS*fNDigits);
  for (Int_t i = 0; i <kMAXDIGITS*fNDigits; i++) {
    (*fTracks)[i] = -1;
  }
}

////////////////////////////////////////////////////////////////////////
void AliTOFSDigit::GetLocation(Int_t *Loc) const
{
  //
  // Get the coordinates of the digit
  // in terms of Sector - Plate - Strip - Pad
  //
  
  Loc[0]=fSector;
  Loc[1]=fPlate;
  Loc[2]=fStrip;
  Loc[3]=fPadx;
  Loc[4]=fPadz;
}

////////////////////////////////////////////////////////////////////////
void AliTOFSDigit::Update(Float_t tdcbin, Int_t tdc, Int_t adc, Int_t track)
{
  //
  // Add charge and track
  //
  
  Int_t sameTime = -1;
  Float_t tdcwindow = AliTOFGeometry::DeadTime()/tdcbin;
  for (Int_t i = 0; i < fNDigits; i++) {
    if (TMath::Abs(tdc-fTdc->At(i)) < tdcwindow) {
      sameTime = i;
      break;
    }
  }
  
  if (sameTime >= 0) { // another time measurement happens during the
		       // dead time of the hit pad => it corresponds
		       // to the same time measurement
    (*fAdc)[sameTime] += adc;

    // update track index array in case the current digit track index
    // is different from -1
    if (track!=-1) {

      //Find the first -1 value of the track index array and replace
      //it by the current digit track index
      for (Int_t iTrack=0; iTrack<kMAXDIGITS; iTrack++) {
	if (track==(*fTracks)[sameTime*kMAXDIGITS+iTrack]) break;
	if ((*fTracks)[sameTime*kMAXDIGITS+iTrack] == -1) {
	  (*fTracks)[sameTime*kMAXDIGITS+iTrack] = track;
	  break;
	}
	// write warning about many tracks going to this pad at same time
	if (iTrack == kMAXDIGITS-1) {
	  AliDebug(1,Form("Update: Many different tracks in the same TOF pad"
			  " (%2d %1d %2d %1d %2d)\n",
			  fSector,fPlate,fStrip,fPadz,fPadx));
	  //ToAliWarning(PrintPad());
	}
      }
    }

  } else { // they are two different time measurements

    // add new time slot
    fNDigits++;
    fTdc->Set(fNDigits);
    (*fTdc)[fNDigits-1] = tdc;
    fAdc->Set(fNDigits);
    (*fAdc)[fNDigits-1] = adc;
    fTracks->Set(fNDigits*kMAXDIGITS);
    (*fTracks)[(fNDigits-1)*kMAXDIGITS] = track;
    for (Int_t i = 1; i <kMAXDIGITS; i++)
      (*fTracks)[(fNDigits-1)*kMAXDIGITS+i] = -1;

  }
  
}

////////////////////////////////////////////////////////////////////////
void AliTOFSDigit::Update(AliTOFSDigit * const sdig)
{

  //
  // Perform the sum with sdig
  //

  Float_t tdcbin = AliTOFGeometry::TdcBinWidth();// [ps] hardwired for the time being

  Int_t track = -1;
  Int_t adc = -1;
  Int_t tdc = -1;

  // start loop on all sdig locations
  Int_t nlocations = sdig->GetNDigits();
  for (Int_t j = 0; j < nlocations; j++) {
    tdc = (Int_t)sdig->GetTdc(j);
    adc = (Int_t)sdig->GetAdc(j);

    // getting here only the first track number
    //Int_t track = GetTrack(j,0);

    // getting here all the track numbers
    for (Int_t iTrack = 0; iTrack<kMAXDIGITS; iTrack++) {
      track = sdig->GetTrack(j,iTrack);
      Update(tdcbin, tdc, adc, track);
    } // end loop on tracks

  } // end loop on sdig locations


}

////////////////////////////////////////////////////////////////////////
AliTOFSDigit::~AliTOFSDigit()
{
  //
  // dtor
  //
  delete fTdc;
  delete fAdc;
  delete fTracks;
}

////////////////////////////////////////////////////////////////////////

Int_t AliTOFSDigit::GetTotPad() const
{
  //
  // Get the "total" index of the pad inside a Sector
  // starting from the digits data.
  //
  
  Int_t pad = AliTOFGeometry::NpadZ()*fPadx + fPadz;
  Int_t before=0;
  
  switch(fPlate){ 
  case 0:
    //before = 0;
    break;
  case 1:
    before = AliTOFGeometry::NStripC();
    break;
  case 2:
    before = AliTOFGeometry::NStripB() +   AliTOFGeometry::NStripC();
    break;
  case 3:
    before = AliTOFGeometry::NStripA() +   AliTOFGeometry::NStripB() + AliTOFGeometry::NStripC();
    break;
  case 4:
    before = AliTOFGeometry::NStripA() + 2*AliTOFGeometry::NStripB() + AliTOFGeometry::NStripC();
    break;
  }
  
  Int_t strip = fStrip + before;
  Int_t padTot = AliTOFGeometry::NpadXStrip()*strip + pad;
  return padTot;
}