#ifndef ALIITSUSIMULATIONPIX_H
#define ALIITSUSIMULATIONPIX_H

/* Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

////////////////////////////////////////////////////////////
// Simulation class for upgrade pixels                    //
////////////////////////////////////////////////////////////
#include <TRandom3.h>
#include <TObjArray.h>
#include "AliITSUSimulation.h"
#include "AliITSUSegmentationPix.h"

class TH1F;
class AliITSUChip;
class AliITSUSimuParam;
class AliITSUParamList;
class TH2;

//-------------------------------------------------------------------

class AliITSUSimulationPix : public AliITSUSimulation {
public:
    enum {kCellX1,kCellX2,kCellZ1,kCellZ2,kCellYDepth,kNDtSpread}; // data used for ch. spread integral calc.
    //
    // charge spread functions defined
    enum {kSpreadFunGauss2D                   // single gaussian in 2D, SpreadFunGauss2D
        ,kSpreadFunDoubleGauss2D            // double gaussian in 2D, SpreadFunDoubleGauss2D
        ,kSpreadFunHisto                    // use 2D histo from the object stored in fResponseParam
        ,kNSpreadFuns
    };
    // These are enums for interpretation of the entries in the AliITSUParamList*fResponseParam :
    // object to holding the sensor-specific response data
    // fist kParamStart entries of spread fun params are reserved for common parameters
    enum {kChargeSpreadType                  // charge spread function type, one of kNSpreadFuns types
        ,kSpreadFunParamNXoffs               // number of pixels to consider +- from injection point (in X)
        ,kSpreadFunParamNZoffs               // number of pixels to consider +- from injection point (in Z)
        ,kSpreadFunMinSteps                  // the single hit charge is divided into kSpreadFunMinSteps (minimum is 3)
        ,kReadOutSchemeType                  // readout type strobe, rolling shutter etc
        ,kReadOutCycleLength                 // full readout cycle window
        ,kSpreadFunGlobalQScale              // Global charge scaling factor to match tes beam results to simu (Geant3)
        ,kPixSNDisrcCut                      // S/N cut applied at discrimination level
        ,kPixMinElToAdd                      // Min number of electrons to add to sdig
        ,kPixNoiseIsOn                       // Turn Pixel Noise on
        ,kPixNoiseInAllMod                   // To apply pixel noise in all chips, if not only on ones where there is a hit
        ,kPixNoiseMPV                        // Pixel noise MPV
        ,kPixNoiseSigma                      // Pixel noise sigma
        ,kPixFakeRate                        // Pixel fake rate
        ,kDigitalSim                         //Digital pixel simulation
        //
        ,kNReservedParams=20                 // some reserved slots
        ,kParamStart = kNReservedParams      // user parameters must start from this slot
    };
    //___ Noisy pixel type
    enum { kNoisyPixOCDB = 9990, kNoisyPixRnd = 9991 };
    
    //
    // defined readout types:
    enum {kReadOutStrobe                      // hits in static time window fReadOutCycleLength wrt offset fReadOOutCycleOffset (global for sensor) are seen
        ,kReadOutRollingShutter             // hits in rolling (row-wise) window are seen (see GetReadOutCycleRollingShutter)
        ,kNReadOutTypes
    };
    // elements of the SpreadFunGauss2D parameterization (offsetted by kParamStart)
    enum {kG1MeanX=kParamStart,kG1SigX,kG1MeanZ,kG1SigZ,kNG1Par};
    // elements of the SpreadFunDoubleGauss2D parameterization (offsetted by kParamStart)
    enum {kG2MeanX0=kParamStart,kG2SigX0,kG2MeanZ0,kG2SigZ0,kG2MeanX1,kG2SigX1,kG2MeanZ1,kG2SigZ1,kG2ScaleG2,kNG2Par};
    //
    AliITSUSimulationPix();
    AliITSUSimulationPix(AliITSUSimuParam* sim,AliITSUSensMap* map);
    virtual ~AliITSUSimulationPix();
    AliITSUSimulationPix(const AliITSUSimulationPix &source);
    AliITSUSimulationPix& operator=(const AliITSUSimulationPix &s);
    void Init();
    //
    void FinishSDigitiseChip();
    void DigitiseChip();
    //
    void SDigitiseChip();
    void WriteSDigits();
    void Hits2SDigits();
    void Hits2SDigitsFast();
    void Hits2SDigitsFastDigital();
    void AddNoisyPixels();
    void RemoveDeadPixels();
    void FrompListToDigits();
    //
    Int_t AddRandomNoisePixels(Double_t tof=0);
    Bool_t SetTanLorAngle(Double_t WeightHole=1.0);
    Double_t GetTanLorAngle() const {return fTanLorAng;};
    //
    // For backwards compatibility
    void SDigitsToDigits(){ FinishSDigitiseChip();}
    //
    Double_t SpreadFunDoubleGauss2D(const Double_t *dtIn);
    Double_t SpreadFunGauss2D(const Double_t *dtIn);
    Double_t SpreadFrom2DHisto(const Double_t *dtIn);
    //
    virtual void SetResponseParam(AliITSUParamList* resp);
    //
    Int_t GetReadOutCycle(Int_t row, Int_t col, Double_t hitTime);
    Int_t GetReadOutCycleRollingShutter(Int_t row, Int_t col, Double_t hitTime);
    //
    void CalcDiodeShiftInPixel(Int_t xrow, Int_t zcol, Float_t &x, Float_t &z);
    //
private:
    void SpreadCharge2D(Double_t x0,Double_t z0, Double_t dy, Int_t ix0,Int_t iz0,
                        Double_t el, Double_t tof, Int_t tID, Int_t hID);
    void PlaceDigitalPixels(Double_t x0,Double_t z0, Double_t el, Double_t tof, Int_t tID, Int_t hID);
    
    //
    void SetCoupling(AliITSUSDigit* old);     // "New" coupling routine  Tiziano Virgili
    void SetCouplingOld(AliITSUSDigit* old);  // "Old" coupling routine  Rocco Caliandro
    //
protected:
    Double_t      fTanLorAng;               //! Tangent of the Lorentz Angle (weighted average for hole and electrons)
    Double_t      fGlobalChargeScale;       // Charge scaling to match Geant and Test beam
    //
    TH2*          fSpread2DHisto;           //! optional 2D histo for charge spread parameterization
    Double_t (AliITSUSimulationPix::*fSpreadFun)(const Double_t *dtIn); //! pointer on current spread function
    Int_t    (AliITSUSimulationPix::*fROTimeFun)(Int_t row,Int_t col, Double_t hitTime); //! pointer on current R/O time check function
    
    ClassDef(AliITSUSimulationPix,1)  // Simulation of pixel clusters
};
#endif