// -*- mode: c++ -*-
/**************************************************************************
 * This file is property of and copyright by the Experimental Nuclear     *
 * Physics Group, Dep. of Physics                                         *
 * University of Oslo, Norway, 2007                                       *
 *                                                                        *
 * Author: Per Thomas Hille <perthi@fys.uio.no> for the ALICE HLT Project.*
 * Contributors are mentioned in the code where appropriate.              *
 * Please report bugs to perthi@fys.uio.no                                *
 *                                                                        *
 * 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.                  *
 **************************************************************************/


// Extraction of Amplitude and peak
// position using specila algorithm
// from Alexei Pavlinov
// ----------------
// ----------------

#include "AliCaloRawAnalyzerFastFit.h"
#include "AliCaloFastAltroFitv0.h"
#include "AliCaloFitResults.h"
#include "AliCaloBunchInfo.h"
#include "TMath.h"
#include <iostream>

using namespace std;
#include "AliCaloConstants.h"

ClassImp( AliCaloRawAnalyzerFastFit )


AliCaloRawAnalyzerFastFit::AliCaloRawAnalyzerFastFit() : AliCaloRawAnalyzerFitter("Fast Fit (Alexei)", "FF")
{
  // Comment
  fAlgo= Algo::kFastFit;
}


AliCaloRawAnalyzerFastFit::~AliCaloRawAnalyzerFastFit()
{

}


AliCaloFitResults 
AliCaloRawAnalyzerFastFit::Evaluate( const vector<AliCaloBunchInfo> &bunchvector, 
				    const UInt_t altrocfg1,  const UInt_t altrocfg2 )
{
  // Comment

  short maxampindex; //index of maximum amplitude
  short maxamp; //Maximum amplitude
  int index = SelectBunch( bunchvector,  &maxampindex,  &maxamp );
 
  if( index >= 0)
    {
      Float_t ped = ReverseAndSubtractPed( &(bunchvector.at(index))  ,  altrocfg1, altrocfg2, fReversed  );
      Float_t maxf = TMath::MaxElement( bunchvector.at(index).GetLength(),  fReversed );
      short timebinOffset = maxampindex - (bunchvector.at(index).GetLength()-1);

      if(  maxf < fAmpCut  ||  ( maxamp - ped) > fOverflowCut  ) // (maxamp - ped) > fOverflowCut = Close to saturation (use low gain then)
	{
	  return  AliCaloFitResults( maxamp, ped, Algo::kCrude, maxf, timebinOffset);
 	}
      else if ( maxf >= fAmpCut ) // no if statement needed really; keep for readability
	{
	  int first = 0;
	  int last = 0;
	  int maxrev =  maxampindex -  bunchvector.at(index).GetStartBin();

	  SelectSubarray( fReversed,  bunchvector.at(index).GetLength(), maxrev , &first, &last, fFitArrayCut);

	  int nsamples =  last - first + 1;

	  if( ( nsamples  )  >= fNsampleCut )  
	    {
	      Double_t ordered[1008];

	      for(int i=0; i < nsamples ; i++ )
		{
		  ordered[i] = fReversed[first + i];
		}

	      Double_t eSignal = 1; // nominal 1 ADC error
	      Double_t dAmp = maxf; 
	      Double_t eAmp = 0;
	      Double_t dTime0 = 0;
	      Double_t eTime = 0;
	      Double_t chi2 = 0;
	      Double_t dTau = 2.35; // time-bin units
	      
	      AliCaloFastAltroFitv0::FastFit(fXaxis, ordered , nsamples,
					     eSignal, dTau, dAmp, eAmp, dTime0, eTime, chi2);
	   
	      Double_t dTimeMax = dTime0 + timebinOffset - (maxrev - first) // abs. t0
		+ dTau; // +tau, makes sum tmax
	      return AliCaloFitResults(maxamp, ped, Ret::kFitPar,  dAmp, dTimeMax, timebinOffset, chi2,  Ret::kDummy,
				       Ret::kDummy, AliCaloFitSubarray(index, maxrev, first, last) );
	    } // samplecut
	  else 
	    {
	      Float_t chi2 = CalculateChi2(maxf, maxrev, first, last);
	      Int_t ndf = last - first - 1; // nsamples - 2
	      return AliCaloFitResults( maxamp, ped, Ret::kCrude, maxf, timebinOffset,
					timebinOffset, chi2, ndf, Ret::kDummy, AliCaloFitSubarray(index, maxrev, first, last) ); 
	    }
	} // ampcut
    } // bunch index    

  return AliCaloFitResults( Ret::kInvalid , Ret::kInvalid );
}