#ifndef ALIITSRAWSTREAMSPD_H
#define ALIITSRAWSTREAMSPD_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
///
/// This class provides access to ITS SPD digits in raw data.
///
///////////////////////////////////////////////////////////////////////////////

#include "AliITSRawStream.h"


class AliITSRawStreamSPD: public AliITSRawStream {
  public :
    AliITSRawStreamSPD(AliRawReader* rawReader);
    virtual ~AliITSRawStreamSPD() {};

    virtual Bool_t   Next();
    virtual Bool_t   ReadCalibHeader();

    // the 2 methods below are equivalent to AliITSRawStream::GetCoord1 and GetCoord2
    // together with the AliITSRawStream::GetModuleID these are the "offline" coordinates
    Int_t    GetColumn() const {return fCoord1;};
    Int_t    GetRow() const {return fCoord2;};

    // together with the AliRawReader::GetDDLID() these are the "online" coordinates
    UShort_t GetHalfStaveNr() const {return fHalfStaveNr;}
    UShort_t GetChipAddr() const {return fChipAddr;}
    Int_t    GetChipCol() const {return fCol;};
    Int_t    GetChipRow() const {return fRow;};

    // module mapping, iModule = halfStaveNr*2+chipAddr/5
    static Int_t GetModuleNumber(UInt_t iDDL, UInt_t iModule) {return fgkDDLModuleMap[iDDL][iModule];}
    
    Bool_t GetHalfStavePresent(UInt_t hs);

    // use the methods below to extract the information from the calibration header
    UInt_t GetHrouterNr() const {return (fCalHeadWord[0] & 0x0000003f);}
    Bool_t GetHhalfStaveScanned(UInt_t hs) const;
    UInt_t GetHtype() const {return (Int_t)((fCalHeadWord[1]) & 0x000000ff);}
    Bool_t GetHdataFormat() const {return (Bool_t)(((fCalHeadWord[1]) & 0x00000100)>>8);}
    UInt_t GetHtriggers() const {return fCalHeadWord[2];}
    Bool_t GetHchipPresent(UInt_t hs, UInt_t chip) const;
    UInt_t GetHdacStart() const {return ((fCalHeadWord[5]>>24) & 0x000000ff);}
    UInt_t GetHdacEnd() const {return ((fCalHeadWord[5]>>16) & 0x000000ff);}
    UInt_t GetHdacStep() const {return ((fCalHeadWord[5]>>8) & 0x000000ff);}
    UInt_t GetHdacId() const {return ((fCalHeadWord[5]) & 0x000000ff);}
    UInt_t GetHrowStart() const {return (UInt_t) ((fCalHeadWord[6]>>24) & 0x000000ff);}
    UInt_t GetHrowEnd() const {return (UInt_t) ((fCalHeadWord[6]>>16) & 0x000000ff);}
    UInt_t GetHrowValue() const {return (UInt_t) ((fCalHeadWord[6]>> 8) & 0x000000ff);}
    UInt_t GetHdacValue() const {return (Int_t) ((fCalHeadWord[6]) & 0x000000ff);}
    UInt_t GetHdacHigh(UInt_t hs) const;
    UInt_t GetHdacLow(UInt_t hs) const;
    UInt_t GetHTPAmp(UInt_t hs) const;

    enum {kDDLsNumber = 20};      // number of DDLs in SPD
    enum {kModulesPerDDL = 12};   // number of modules in each DDL
    enum {kCalHeadLenMax = 16};   // maximum number of calib header words

  private :
    static const Int_t fgkDDLModuleMap[kDDLsNumber][kModulesPerDDL];  // mapping DDL/module -> module number

    Bool_t           ReadNextShort();
    Bool_t           ReadNextInt();
    void             NewEvent();

    Int_t            fEventNumber;                 // chip event counter
    UShort_t         fChipAddr;                    // chip nr
    UShort_t         fHalfStaveNr;                 // half stave nr
    UInt_t           fCol;                         // chip column nr
    UInt_t           fRow;                         // chip row nr
    UInt_t           fCalHeadWord[kCalHeadLenMax]; // calibration header words

    UShort_t         fData;            // 16 bit data word read
    UInt_t           fOffset;          // offset for cell column
    UInt_t           fHitCount;        // counter of hits
    UChar_t          fDataChar1, fDataChar2, fDataChar3, fDataChar4; // temps part of a 32bit word
    Bool_t           fFirstWord;       // keeps track of which of the two 16bit words out of the 32bit word to read when ReadNextShort is called
    Bool_t           fCalHeadRead[20];             // calibration header read flags (reset at new event)
    UInt_t           fPrevEventId;                 // previous event id (needed to know if there is a new event)

    ClassDef(AliITSRawStreamSPD, 0) // class for reading ITS SPD raw digits
};

#endif