#ifndef ALIITSSIMULATIONSPD_H
#define ALIITSSIMULATIONSPD_H

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

/* $Id$ */

////////////////////////////////////////////////////////////
// Simulation class for SPD                               //
////////////////////////////////////////////////////////////

#include "TObjArray.h"
#include "AliITSsimulation.h"
#include "AliITSsegmentationSPD.h"

class TH1F;
class AliITSmodule;
//class AliITSresponseSPD;

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

class AliITSsimulationSPD : public AliITSsimulation {
public:
   AliITSsimulationSPD();
   //    AliITSsimulationSPD(AliITSsegmentation *seg,AliITSCalibration *res);
   AliITSsimulationSPD(AliITSDetTypeSim *dettyp);
   virtual ~AliITSsimulationSPD();
   // copy constructor
   AliITSsimulationSPD(const AliITSsimulationSPD &source); 
    // ass. operator
   AliITSsimulationSPD& operator=(const AliITSsimulationSPD &s);
   //    virtual AliITSsimulation& operator=(const AliITSsimulation &source);
   // Initilizes the variables
   void Init();

   // General User calling routines
   // Initilize simulation for a specific event and module
   void InitSimulationModule(Int_t module, Int_t event);
   // Finish and write S Digitization
   void FinishSDigitiseModule();
   // From hits to Digits, without creating SDigits
   void DigitiseModule(AliITSmodule *mod,Int_t,Int_t);

   // More or less Internal Routines
   // Create S Digits from specific module
   void SDigitiseModule(AliITSmodule *mod, Int_t mask, Int_t event);
   // Write S Digits to the tree of SDigits.
   void WriteSDigits();
   // fill pList from hits, charge sharing, diffusion, coupling
   void HitToSDigit(AliITSmodule *mod);
   // fill pList from hits, charge sharing, diffusion, coupling  (faster method optimized by Bjorne)
   void HitToSDigitFast(AliITSmodule *mod);
   // Adds noisy pixels to pList
   void AddNoisyPixels();   
   // Removes dead pixels from pList
   void RemoveDeadPixels();
   // Take pList of signals and apply noise... create Digits
   void FrompListToDigits();
   // This set the Lorentz drift of Electrons and Holes: by deafult equal weights to Electrons and Holes
   void SetLorentzDrift(Bool_t b=kFALSE)
        {fLorentz=b; if(fLorentz) SetTanLorAngle();};
   // This function set the relative contribution between holes and electrons: use  0<=WeightHole<=1
   Bool_t SetTanLorAngle(Double_t WeightHole=0.5);
   // Getter for the Lorentz angle
   Double_t GetTanLorAngle(){return fTanLorAng;};
   //
   void CreateHistograms();
   void FillHistograms(Int_t ix,Int_t iz,Double_t v=1.0);
   void ResetHistograms();
   TH1F* GetHistogram(Int_t i){return (TH1F*)(fHis->At(i));}// get histogram
   TObjArray*  GetHistArray() {return fHis;}// get hist array
   TString& GetHistName(){return fSPDname;}
   void SetHistName(TString &n){fSPDname = n;}
   //
   // For backwards compatibility
   void SDigitsToDigits(){ FinishSDigitiseModule();};
   void HitToDigit(AliITSmodule *mod){
       // Standard interface to DigitiseModule  Inputs: AliITSmodule *mod  Pointer to this module
       DigitiseModule(mod,GetModuleNumber(),0);};

   // This sets fStrobe flag and allows generating the strobe and applying it to select hits 
   void SetStrobeGeneration(Bool_t b=kFALSE) {fStrobe=b;};
   void GenerateStrobePhase();

private:
   void SpreadCharge(Double_t x0,Double_t z0,Int_t ix0,Int_t iz0,
		      Double_t el,Double_t sig,Double_t ld,Int_t t,Int_t hi);
   void SpreadChargeAsym(Double_t x0,Double_t z0,Int_t ix0,Int_t iz0,
                     Double_t el,Double_t sigx,Double_t sigz,Double_t ld,Int_t t,Int_t hi);
   void UpdateMapSignal(Int_t ix,Int_t iz,Int_t trk,Int_t ht,Double_t signal){
       //  This function adds a signal to the pList from the pList class
       //  Inputs: iz column number  ix row number  trk track number  ht hit number  signal signal strength
       GetMap()->AddSignal(iz,ix,trk,ht,GetModuleNumber(),signal);};
   void UpdateMapNoise(Int_t ix,Int_t iz,Float_t noise){
       //  This function adds noise to data in the MapA2 as well as the pList
       //  Inputs:  iz column number  ix row number  noise electronic noise generated by FrompListToDigits
       GetMap()->AddNoise(iz,ix,GetModuleNumber(),noise);}
   // Get a pointer to the segmentation object
   virtual AliITSsegmentation* GetSegmentationModel(Int_t /*dt*/){return fDetType->GetSegmentationModel(0);}
   // set pointer to segmentation objec
   virtual void SetSegmentationModel(Int_t /*dt*/, AliITSsegmentation *seg){fDetType->SetSegmentationModel(0,seg);}
   // Bari-Salerno Coupling parameters
   // "New" coupling routine  Tiziano Virgili
   void SetCoupling(Int_t col,Int_t row,Int_t ntrack,Int_t idhit);
   // "Old" coupling routine  Rocco Caliandro
   void SetCouplingOld(Int_t col, Int_t row,Int_t ntrack,Int_t idhit);
   // Getters for data kept in fSegmentation and fResponse.
   // Returns the Threshold in electrons
   Double_t GetThreshold(){
     Double_t th,sig;AliITSSimuParam* simpar = fDetType->GetSimuParam(); 
       simpar->SPDThresholds(GetModuleNumber(),th,sig);return th;}; 
   // Returns the couplings Columb and Row.
   void GetCouplings(Double_t &cc,Double_t &cr){
     AliITSSimuParam* simpar = fDetType->GetSimuParam();
     simpar->GetSPDCouplingParam(cc,cr);};
   // Returns the number of pixels in x
   Int_t GetNPixelsX(){return GetSegmentationModel(0)->Npx();};
   // Returns the number of pixels in z
   Int_t GetNPixelsZ(){return GetSegmentationModel(0)->Npz();};

   TObjArray    *fHis;          //! just in case for histogramming
   TString       fSPDname;      //! Histogram name
   Int_t         fCoupling;     // Sets the coupling to be used.
                                // ==1 use SetCoupling, ==2 use SetCouplingOld
   Bool_t        fLorentz;      // kTRUE if Lorentz drift has been allowed 
   Double_t      fTanLorAng;    //! Tangent of the Lorentz Angle (weighted average for hole and electrons)
   Bool_t        fStrobe;       // kTRUE if readout strobe with proper phase applied to select hits
   Int_t         fStrobeLenght; // Strobe signal lenght in units of 25 ns
   Double_t      fStrobePhase;  // The phase of the strobe signal with respect to the trigger
   ClassDef(AliITSsimulationSPD,4)  // Simulation of SPD clusters
};
#endif