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/** \file     ContextModelling.h

 *  \brief    Classes providing probability descriptions and contexts (header)

 */

#pragma once

#include "CommonDef.h"

#include "Contexts.h"

#include "Slice.h"

#include "Unit.h"

#include "UnitPartitioner.h"

#include <bitset>

//! \ingroup CommonLib

//! \{

namespace vvenc

{

struct CtxTpl

{

  // lower 5 bits are absSum1, upper 3 bits are numPos

  uint8_t ctxTpl;

};

struct CoeffCodingContext

{

public:

  CoeffCodingContext( const TransformUnit& tu, ComponentID component, bool signHide, bool bdpcm = false, CtxTpl* tplBuf = nullptr );

public:

  void  initSubblock    ( int SubsetId, bool sigGroupFlag = false );

public:

  void  resetSigGroup   ()                      { m_sigCoeffGroupFlag.reset( m_subSetPos ); }

  void  setSigGroup     ()                      { m_sigCoeffGroupFlag.set( m_subSetPos ); }

  bool  noneSigGroup    ()                      { return m_sigCoeffGroupFlag.none(); }

  int   lastSubSet      ()                      { return ( maxNumCoeff() - 1 ) >> log2CGSize(); }

  bool  isLastSubSet    ()                      { return lastSubSet() == m_subSetId; }

  bool  only1stSigGroup ()                      { return m_sigCoeffGroupFlag.count()-m_sigCoeffGroupFlag[lastSubSet()]==0; }

  void  setScanPosLast  ( int       posLast )   { m_scanPosLast = posLast; }

public:

  ComponentID     compID          ()                        const { return m_compID; }

  int             subSetId        ()                        const { return m_subSetId; }

  int             subSetPos       ()                        const { return m_subSetPos; }

  int             cgPosY          ()                        const { return m_subSetPosY; }

  int             cgPosX          ()                        const { return m_subSetPosX; }

  unsigned        width           ()                        const { return m_width; }

  unsigned        height          ()                        const { return m_height; }

  unsigned        log2CGWidth     ()                        const { return m_log2CGWidth; }

  unsigned        log2CGHeight    ()                        const { return m_log2CGHeight; }

  unsigned        log2CGSize      ()                        const { return m_log2CGSize; }

  int             maxLog2TrDRange ()                        const { return m_maxLog2TrDynamicRange; }

  unsigned        maxNumCoeff     ()                        const { return m_maxNumCoeff; }

  int             scanPosLast     ()                        const { return m_scanPosLast; }

  int             minSubPos       ()                        const { return m_minSubPos; }

  int             maxSubPos       ()                        const { return m_maxSubPos; }

  bool            isLast          ()                        const { return ( ( m_scanPosLast >> m_log2CGSize ) == m_subSetId ); }

  bool            isNotFirst      ()                        const { return ( m_subSetId != 0 ); }

  bool            isSigGroup      ( int scanPosCG )         const { return m_sigCoeffGroupFlag[m_scanCG[scanPosCG].idx]; }

  bool            isSigGroup      ()                        const { return m_sigCoeffGroupFlag[ m_subSetPos ]; }

  bool            signHiding      ()                        const { return m_signHiding; }

  bool            hideSign        ( int       posFirst,

                                    int       posLast   )   const { return ( m_signHiding && ( posLast - posFirst >= SBH_THRESHOLD ) ); }

  unsigned        blockPos        ( int scanPos )           const { return m_scan[scanPos].idx; }

  unsigned        posX            ( int scanPos )           const { return m_scan[scanPos].x; }

  unsigned        posY            ( int scanPos )           const { return m_scan[scanPos].y; }

  unsigned        maxLastPosX     ()                        const { return m_maxLastPosX; }

  unsigned        maxLastPosY     ()                        const { return m_maxLastPosY; }

  unsigned        lastXCtxId      ( unsigned  posLastX  )   const { return m_CtxSetLastX( m_lastOffsetX + ( posLastX >> m_lastShiftX ) ); }

  unsigned        lastYCtxId      ( unsigned  posLastY  )   const { return m_CtxSetLastY( m_lastOffsetY + ( posLastY >> m_lastShiftY ) ); }

  unsigned        sigGroupCtxId   ( bool ts = false     )   const { return ts ? m_sigGroupCtxIdTS : m_sigGroupCtxId; }

  bool            bdpcm           ()                        const { return m_bdpcm; }

  unsigned sigCtxIdAbs( int scanPos, const TCoeffSig* coeff, const int state )

  {

    const uint32_t   posY      = m_scan[scanPos].y;

    const uint32_t   posX      = m_scan[scanPos].x;

    const TCoeffSig* pData     = coeff + posX + posY * m_width;

    const int        diag      = posX + posY;

    int              numPos    = 0;

    int              sumAbs    = 0;

#define UPDATE(x) {int a=abs(x);sumAbs+=std::min(4+(a&1),a);numPos+=!!a;}

    if( posX < m_width-1 )

    {

      UPDATE( pData[1] );

      if( posX < m_width-2 )

      {

        UPDATE( pData[2] );

      }

      if( posY < m_height-1 )

      {

        UPDATE( pData[m_width+1] );

      }

    }

    if( posY < m_height-1 )

    {

      UPDATE( pData[m_width] );

      if( posY < m_height-2 )

      {

        UPDATE( pData[m_width<<1] );

      }

    }

#undef UPDATE

    int ctxOfs = std::min((sumAbs+1)>>1, 3) + ( diag < 2 ? 4 : 0 );

    if( m_chType == CH_L )

    {

      ctxOfs += diag < 5 ? 4 : 0;

    }

    m_tmplCpDiag = diag;

    m_tmplCpSum1 = sumAbs - numPos;

    return m_sigFlagCtxSet[std::max( 0, state-1 )]( ctxOfs );

  }

  // sigCtxIdAbsWithAcc and absVal1stPass run for every coefficient position of residual coding

  ALWAYS_INLINE unsigned sigCtxIdAbsWithAcc( const int scanPos, const int state )

  {

    const auto scanEl       = m_scan[scanPos];

    const uint32_t posY     = scanEl.y;

    const uint32_t posX     = scanEl.x;

    const int32_t blkPos    = scanEl.idx;

    const int      diag     = posX + posY;

    const int      tplVal   = m_tplBuf[-blkPos].ctxTpl;

    const int      numPos   = tplVal >> 5u;

    const int      sumAbs   = tplVal & 31;

    int ctxOfs = std::min( ( sumAbs + 1 ) >> 1, 3 ) + ( diag < 2 ? 4 : 0 );

    if( isLuma( m_chType ) )

    {

      ctxOfs += diag < 5 ? 4 : 0;

    }

    m_tmplCpDiag = diag;

    m_tmplCpSum1 = sumAbs - numPos;

    return m_sigFlagCtxSet[std::max( 0, state-1 )]( ctxOfs );

  }

  ALWAYS_INLINE void absVal1stPass( const int scanPos, const TCoeffSig absLevel1 )

  {

    CHECKD( !absLevel1, "Shound not be called if '0'!" );

    const auto scanEl     = m_scan[scanPos];

    const uint32_t posY   = scanEl.y;

    const uint32_t posX   = scanEl.x;

    const int32_t  blkPos = scanEl.idx;

    auto update_deps = [&]( int offset )

    {

      auto& ctx   = m_tplBuf[-blkPos + offset];

      ctx.ctxTpl += uint8_t( 32 + absLevel1 );

    };

    if( posY > 1 ) update_deps( 2 * m_width );

    if( posY > 0

     && posX > 0 ) update_deps( m_width + 1 );

    if( posY > 0 ) update_deps( m_width );

    if( posX > 1 ) update_deps( 2 );

    if( posX > 0 ) update_deps( 1 );

  }

  void remAbsVal1stPass( const int scanPos, const TCoeffSig absLevel1 )

  {

    CHECKD( !absLevel1, "Shound not be called if '0'!" );

    const auto scanEl     = m_scan[scanPos];

    const uint32_t posY   = scanEl.y;

    const uint32_t posX   = scanEl.x;

    const int32_t  blkPos = scanEl.idx;

    auto update_deps = [&]( int offset )

    {

      auto& ctx   = m_tplBuf[-blkPos + offset];

      ctx.ctxTpl -= uint8_t( 32 + absLevel1 );

    };

    if( posY > 1 ) update_deps( 2 * m_width );

    if( posY > 0

     && posX > 0 ) update_deps( m_width + 1 );

    if( posY > 0 ) update_deps( m_width );

    if( posX > 1 ) update_deps( 2 );

    if( posX > 0 ) update_deps( 1 );

  }

  uint8_t ctxOffsetAbs()

  {

    int offset = 0;

    if( m_tmplCpDiag != -1 )

    {

      offset  = std::min( m_tmplCpSum1, 4 ) + 1;

      offset += ( !m_tmplCpDiag ? ( m_chType == CH_L ? 15 : 5 ) : m_chType == CH_L ? m_tmplCpDiag < 3 ? 10 : ( m_tmplCpDiag < 10 ? 5 : 0 ) : 0 );

    }

    return uint8_t(offset);

  }

  unsigned parityCtxIdAbs   ( uint8_t offset )  const { return m_parFlagCtxSet   ( offset ); }

  unsigned greater1CtxIdAbs ( uint8_t offset )  const { return m_gtxFlagCtxSet[1]( offset ); }

  unsigned greater2CtxIdAbs ( uint8_t offset )  const { return m_gtxFlagCtxSet[0]( offset ); }

  unsigned templateAbsSum( int scanPos, const TCoeffSig* coeff, int baseLevel )

  {

    const uint32_t   posY = m_scan[scanPos].y;

    const uint32_t   posX = m_scan[scanPos].x;

    const TCoeffSig* pData = coeff + posX + posY * m_width;

    int              sum   = 0;

    if (posX < m_width - 1)

    {

      sum += abs(pData[1]);

      if (posX < m_width - 2)

      {

        sum += abs(pData[2]);

      }

      if (posY < m_height - 1)

      {

        sum += abs(pData[m_width + 1]);

      }

    }

    if (posY < m_height - 1)

    {

      sum += abs(pData[m_width]);

      if (posY < m_height - 2)

      {

        sum += abs(pData[m_width << 1]);

      }

    }

    return std::max(std::min(sum - 5 * baseLevel, 31), 0);

  }

  unsigned sigCtxIdAbsTS( int scanPos, const TCoeffSig* coeff )

  {

    const uint32_t   posY   = m_scan[scanPos].y;

    const uint32_t   posX   = m_scan[scanPos].x;

    const TCoeffSig* posC   = coeff + posX + posY * m_width;

    int              numPos = 0;

#define UPDATE(x) {int a=abs(x);numPos+=!!a;}

    if( posX > 0 )

    {

      UPDATE( posC[-1] );

    }

    if( posY > 0 )

    {

      UPDATE( posC[-(int)m_width] );

    }

#undef UPDATE

    return m_tsSigFlagCtxSet( numPos );

  }

  unsigned parityCtxIdAbsTS   ()                  const { return m_tsParFlagCtxSet(      0 ); }

  unsigned greaterXCtxIdAbsTS ( uint8_t offset )  const { return m_tsGtxFlagCtxSet( offset ); }

  unsigned lrg1CtxIdAbsTS(int scanPos, const TCoeffSig* coeff, int bdpcm)

  {

    const uint32_t   posY = m_scan[scanPos].y;

    const uint32_t   posX = m_scan[scanPos].x;

    const TCoeffSig* posC = coeff + posX + posY * m_width;

    int             numPos = 0;

#define UPDATE(x) {int a=abs(x);numPos+=!!a;}

    if (bdpcm)

    {

      numPos = 3;

    }

    else

    {

      if (posX > 0)

      {

        UPDATE(posC[-1]);

      }

      if (posY > 0)

      {

        UPDATE(posC[-(int)m_width]);

      }

    }

#undef UPDATE

    return m_tsLrg1FlagCtxSet(numPos);

  }

  unsigned signCtxIdAbsTS(int scanPos, const TCoeffSig* coeff, int bdpcm)

  {

    const uint32_t   posY  = m_scan[scanPos].y;

    const uint32_t   posX  = m_scan[scanPos].x;

    const TCoeffSig* pData = coeff + posX + posY * m_width;

    int rightSign = 0, belowSign = 0;

    unsigned signCtx = 0;

    if (posX > 0)

    {

      rightSign = pData[-1];

    }

    if (posY > 0)

    {

      belowSign = pData[-(int)m_width];

    }

    if ((rightSign == 0 && belowSign == 0) || ((rightSign*belowSign) < 0))

    {

      signCtx = 0;

    }

    else if (rightSign >= 0 && belowSign >= 0)

    {

      signCtx = 1;

    }

    else

    {

      signCtx = 2;

    }

    if (bdpcm)

    {

      signCtx += 3;

    }

    return m_tsSignFlagCtxSet(signCtx);

  }

  void neighTS(int& rightPixel, int& belowPixel, int scanPos, const TCoeffSig* coeff)

  {

    const uint32_t   posY = m_scan[scanPos].y;

    const uint32_t   posX = m_scan[scanPos].x;

    const TCoeffSig* data = coeff + posX + posY * m_width;

    rightPixel = belowPixel = 0;

    if (posX > 0)

    {

      rightPixel = data[-1];

    }

    if (posY > 0)

    {

      belowPixel = data[-(int)m_width];

    }

  }

  int deriveModCoeff(int rightPixel, int belowPixel, int absCoeff, int bdpcm = 0)

  {

    if (absCoeff == 0)

      return 0;

    int pred1, absBelow = abs(belowPixel), absRight = abs(rightPixel);

    int absCoeffMod = absCoeff;

    if (bdpcm == 0)

    {

      pred1 = std::max(absBelow, absRight);

      if (absCoeff == pred1)

      {

        absCoeffMod = 1;

      }

      else

      {

        absCoeffMod = absCoeff < pred1 ? absCoeff + 1 : absCoeff;

      }

    }

    return(absCoeffMod);

  }

  int decDeriveModCoeff(int rightPixel, int belowPixel, int absCoeff)

  {

    if (absCoeff == 0)

      return 0;

    int pred1, absBelow = abs(belowPixel), absRight = abs(rightPixel);

    pred1 = std::max(absBelow, absRight);

    int absCoeffMod;

    if (absCoeff == 1 && pred1 > 0)

    {

      absCoeffMod = pred1;

    }

    else

    {

      absCoeffMod = absCoeff - (absCoeff <= pred1);

    }

    return(absCoeffMod);

  }

  //unsigned templateAbsSumTS( int scanPos, const TCoeffSig* coeff )

  //{

  //  return 1;

  //}

  int                       remRegBins;

private:

  // constant

  const ComponentID         m_compID;

  const ChannelType         m_chType;

  const unsigned            m_width;

  const unsigned            m_height;

  const unsigned            m_log2CGWidth;

  const unsigned            m_log2CGHeight;

  const unsigned            m_log2CGSize;

  const unsigned            m_widthInGroups;

  const unsigned            m_heightInGroups;

  const unsigned            m_log2WidthInGroups;

  const unsigned            m_log2BlockWidth;

  const unsigned            m_log2BlockHeight;

  const unsigned            m_maxNumCoeff;

  const bool                m_signHiding;

  const int                 m_maxLog2TrDynamicRange;

  const ScanElement *       m_scan;

  const ScanElement *       m_scanCG;

  const CtxSet              m_CtxSetLastX;

  const CtxSet              m_CtxSetLastY;

  const unsigned            m_maxLastPosX;

  const unsigned            m_maxLastPosY;

  const int                 m_lastOffsetX;

  const int                 m_lastOffsetY;

  const int                 m_lastShiftX;

  const int                 m_lastShiftY;

  // modified

  int                       m_scanPosLast;

  int                       m_subSetId;

  int                       m_subSetPos;

  int                       m_subSetPosX;

  int                       m_subSetPosY;

  int                       m_minSubPos;

  int                       m_maxSubPos;

  unsigned                  m_sigGroupCtxId;

  int                       m_tmplCpSum1;

  int                       m_tmplCpDiag;

  CtxSet                    m_sigFlagCtxSet[3];

  CtxSet                    m_parFlagCtxSet;

  CtxSet                    m_gtxFlagCtxSet[2];

  unsigned                  m_sigGroupCtxIdTS;

  CtxSet                    m_tsSigFlagCtxSet;

  CtxSet                    m_tsParFlagCtxSet;

  CtxSet                    m_tsGtxFlagCtxSet;

  CtxSet                    m_tsLrg1FlagCtxSet;

  CtxSet                    m_tsSignFlagCtxSet;

  std::bitset<MLS_GRP_NUM>  m_sigCoeffGroupFlag;

  const bool                m_bdpcm;

  CtxTpl*                   m_tplBuf;

};

struct CUCtx

{

  CUCtx()              : isDQPCoded(false), isChromaQpAdjCoded(false),

                         qgStart(false)

                         {

                           violatesLfnstConstrained[CH_L] = false;

                           violatesLfnstConstrained[CH_C] = false;

                           violatesMtsCoeffConstraint      = false;

                           mtsLastScanPos                  = false;

                           lfnstLastScanPos                = false;

                         }

  CUCtx(int _qp)       : isDQPCoded(false), isChromaQpAdjCoded(false),

                         qgStart(false),

                         qp(_qp)

                         {

                           violatesLfnstConstrained[CH_L] = false;

                           violatesLfnstConstrained[CH_C] = false;

                           violatesMtsCoeffConstraint      = false;

                           mtsLastScanPos                  = false;

                           lfnstLastScanPos                = false;

                         }

  bool      isDQPCoded;

  bool      isChromaQpAdjCoded;

  bool      qgStart;

  bool      lfnstLastScanPos;

  int8_t    qp;                   // used as a previous(last) QP and for QP prediction

  bool      violatesLfnstConstrained[MAX_NUM_CH];

  bool      violatesMtsCoeffConstraint;

  bool      mtsLastScanPos;

};

struct MergeCtx

{

  MergeCtx() : numValidMergeCand( 0 ), hasMergedCandList( false ) { for( unsigned i = 0; i < MRG_MAX_NUM_CANDS; i++ ) mrgTypeNeighbours[i] = MRG_TYPE_DEFAULT_N; }

  void          setMmvdMergeCandiInfo ( CodingUnit& cu, const MmvdIdx candIdx) const;

  void          setMergeInfo          ( CodingUnit& cu, const int     candIdx) const;

  void          getMmvdDeltaMv        ( const Slice& slice, const MmvdIdx candIdx, Mv deltaMv[NUM_REF_PIC_LIST_01] ) const;

  MvField       mvFieldNeighbours [MRG_MAX_NUM_CANDS][NUM_REF_PIC_LIST_01];

  uint8_t       BcwIdx            [MRG_MAX_NUM_CANDS];

  unsigned char interDirNeighbours[MRG_MAX_NUM_CANDS];

  MergeType     mrgTypeNeighbours [MRG_MAX_NUM_CANDS];

  int           numValidMergeCand;

  bool          hasMergedCandList;

  MvField       mmvdBaseMv        [MMVD_BASE_MV_NUM][NUM_REF_PIC_LIST_01];

  bool          mmvdUseAltHpelIf  [MMVD_BASE_MV_NUM];

  bool          useAltHpelIf      [MRG_MAX_NUM_CANDS];

};

struct AffineMergeCtx

{

  AffineMergeCtx() : numValidMergeCand( 0 ) { for ( unsigned i = 0; i < AFFINE_MRG_MAX_NUM_CANDS; i++ ) affineType[i] = AFFINEMODEL_4PARAM; }

  MvField       mvFieldNeighbours [AFFINE_MRG_MAX_NUM_CANDS][NUM_REF_PIC_LIST_01][3];

  unsigned char interDirNeighbours[AFFINE_MRG_MAX_NUM_CANDS];

  EAffineModel  affineType        [AFFINE_MRG_MAX_NUM_CANDS];

  uint8_t       BcwIdx            [AFFINE_MRG_MAX_NUM_CANDS];

  int           numValidMergeCand;

  int           maxNumMergeCand;

  MergeType     mergeType[AFFINE_MRG_MAX_NUM_CANDS];

  MotionBuf     subPuMvpMiBuf;

};

struct DeriveCtx

{

  const CodingUnit* cuRestrictedLeft[MAX_NUM_CH];

  const CodingUnit* cuRestrictedAbove[MAX_NUM_CH];

  void determineNeighborCus       ( const CodingStructure& cs, const UnitArea& ua, const ChannelType ch, const TreeType treeType );

  inline static unsigned CtxQtCbf ( const ComponentID compID, const bool prevCbf = false, const int ispIdx = 0 )   { return ( ispIdx && isLuma( compID ) ) ? (2 + (int)prevCbf) : (((compID == COMP_Cr) && prevCbf) ? 1 : 0); }

  void     CtxSplit               ( const Partitioner& partitioner, unsigned& ctxSpl, unsigned& ctxQt, unsigned& ctxHv, unsigned& ctxHorBt, unsigned& ctxVerBt, const bool canSplit[6] ) const;

  unsigned CtxMipFlag             ( const CodingUnit& cu ) const;

  unsigned CtxInterDir            ( const CodingUnit& cu ) const { return ( 7 - ((Log2(cu.lumaSize().area()) + 1) >> 1) ); }

  unsigned CtxModeConsFlag() const

  {

    const CodingUnit* cuLeft  = cuRestrictedLeft[CH_L]; const CodingUnit* cuAbove = cuRestrictedAbove[CH_L];

    return ((cuAbove && cuAbove->predMode == MODE_INTRA) || (cuLeft && cuLeft->predMode == MODE_INTRA)) ? 1 : 0;

  }

  unsigned CtxAffineFlag() const

  {

    const CodingUnit *cuLeft = cuRestrictedLeft[CH_L]; const CodingUnit *cuAbove = cuRestrictedAbove[CH_L];

    return (( cuLeft && cuLeft->affine ) ? 1 : 0) + (( cuAbove && cuAbove->affine ) ? 1 : 0);

  }

  unsigned CtxSkipFlag() const

  {

    const CodingUnit *cuLeft = cuRestrictedLeft[CH_L]; const CodingUnit *cuAbove = cuRestrictedAbove[CH_L];

    return (( cuLeft && cuLeft->skip ) ? 1 : 0) + (( cuAbove && cuAbove->skip ) ? 1 : 0);

  }

  unsigned CtxPredModeFlag() const

  {

    const CodingUnit *cuLeft = cuRestrictedLeft[CH_L]; const CodingUnit *cuAbove = cuRestrictedAbove[CH_L];

    return ((cuAbove && cuAbove->predMode == MODE_INTRA) || (cuLeft && cuLeft->predMode == MODE_INTRA)) ? 1 : 0;

  }

  unsigned CtxIBCFlag(const CodingUnit& cu) const

  {

    const CodingUnit *cuLeft = cuRestrictedLeft[cu.chType]; const CodingUnit *cuAbove = cuRestrictedAbove[cu.chType];

    return ((cuLeft && cuLeft->predMode == MODE_IBC) ? 1 : 0) + ((cuAbove && cuAbove->predMode == MODE_IBC) ? 1 : 0);

  }

};

} // namespace vvenc

//! \}