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/** \file     RdCost.h

    \brief    RD cost computation classes (header)

*/

#pragma once

#include "CommonDef.h"

#include "Mv.h"

#include "Unit.h"

#include "Slice.h"

#include <math.h>

//! \ingroup CommonLib

//! \{

namespace vvenc {

#if defined(TARGET_SIMD_X86)  && ENABLE_SIMD_OPT_DIST

using namespace x86_simd;

#endif

#if defined(TARGET_SIMD_ARM)  && ENABLE_SIMD_OPT_DIST

using namespace arm_simd;

#endif

class DistParam;

// ====================================================================================================================

// Type definition

// ====================================================================================================================

// for function pointer

typedef Distortion( *FpDistFunc   )( const DistParam& );

typedef void      ( *FpDistFuncX5 )( const DistParam&, Distortion*, bool );

// ====================================================================================================================

// Class definition

// ====================================================================================================================

/// distortion parameter class

class DistParam

{

public:

  CPelBuf               org;

  CPelBuf               cur;

  FpDistFunc            distFunc  = nullptr;

  FpDistFuncX5          dmvrSadX5 = nullptr;

#if ENABLE_MEASURE_SEARCH_SPACE

  FpDistFunc            xDistFunc = nullptr;

#endif

  int                   bitDepth    = 0;

  int                   subShift    = 0;

  ComponentID           compID      = MAX_NUM_COMP;

  bool                  applyWeight = false;     // whether weighted prediction is used or not

  Distortion            maximumDistortionForEarlyExit = MAX_DISTORTION; /// During cost calculations, if distortion exceeds this value, cost calculations may early-terminate.

  const WPScalingParam* wpCur   = nullptr;           // weighted prediction scaling parameters for current ref

  const CPelBuf*        orgLuma = nullptr;

  const Pel*            mask        = nullptr;

  int                   maskStride  = 0;

  int                   stepX       = 0;

  int                   maskStride2 = 0;

  DistParam() = default;

  DistParam( const CPelBuf& _org, const CPelBuf& _cur,  FpDistFunc _distFunc, int _bitDepth, int _subShift, ComponentID _compID )

    : org(_org), cur(_cur), distFunc(_distFunc), bitDepth(_bitDepth), subShift(_subShift), compID(_compID)

  {

  }

};

/// RD cost computation class

class RdCost

{

public:

  Distortion ( *m_fxdWtdPredPtr )( const DistParam& dp, uint32_t fixedWeight );

  // for distortion

  FpDistFunc              m_afpDistortFunc[2][DF_TOTAL_FUNCTIONS]; // [eDFunc]

  FpDistFuncX5            m_afpDistortFuncX5[2]; // [eDFunc]

private:

  vvencCostMode           m_costMode;

  double                  m_distortionWeight[MAX_NUM_COMP]; // only chroma values are used.

  double                  m_dLambda;

  double                  m_dLambda_unadjusted; // TODO: check is necessary

  double                  m_DistScaleUnadjusted;

  std::vector<uint32_t>   m_lumaLevelToWeightPLUT;

  double                  m_chromaWeight;

  ChromaFormat            m_cf;

  double                  m_DistScale;

  double                  m_dLambdaMotionSAD;

  // for motion cost

  Mv                      m_mvPredictor;

  Mv                      m_bvPredictors[2];

  double                  m_motionLambda;

  int                     m_iCostScale;

  double                  m_dCostIBC;

public:

  RdCost();

  virtual ~RdCost();

  void          create( bool enableOpt = true );

#if defined(TARGET_SIMD_X86)  && ENABLE_SIMD_OPT_DIST

  void          initRdCostX86();

  template <X86_VEXT vext>

  void          _initRdCostX86();

#endif

#if defined(TARGET_SIMD_ARM)  && ENABLE_SIMD_OPT_DIST

  void initRdCostARM();

  template<ARM_VEXT vext>

  void _initRdCostARM();

#endif   // TARGET_SIMD_ARM

  void          setDistortionWeight ( const ComponentID compID, const double distortionWeight ) { m_distortionWeight[compID] = distortionWeight; }

  void          setLambda           ( double dLambda, const BitDepths &bitDepths );

  void          setCostMode         ( vvencCostMode m )                      { m_costMode = m; }

  double        getLambda           ( bool unadj = false )              { return unadj ? m_dLambda_unadjusted : m_dLambda; }

  double        getChromaWeight     ()                                  { return ((m_distortionWeight[COMP_Cb] + m_distortionWeight[COMP_Cr]) / 2.0); }

  double        calcRdCost          ( uint64_t fracBits, Distortion distortion, bool useUnadjustedLambda = true ) const

  {

    return ( useUnadjustedLambda ? m_DistScaleUnadjusted : m_DistScale ) * double( distortion ) + double( fracBits );

  }

  void          setDistParam        ( DistParam &rcDP, const CPelBuf& org, const Pel* piRefY , int iRefStride, int bitDepth, ComponentID compID, int subShiftMode = 0, int useHadamard = 0 );

  DistParam     setDistParam        ( const CPelBuf& org, const CPelBuf& cur, int bitDepth, DFunc dfunc );

  DistParam     setDistParam        ( const Pel* pOrg, const Pel* piRefY, int iOrgStride, int iRefStride, int bitDepth, ComponentID compID, int width, int height, int subShift, bool isDMVR = false );

  void          setDistParamGeo     ( DistParam &rcDP, const CPelBuf& org, const Pel *piRefY, int iRefStride, const Pel *mask, int iMaskStride, int stepX, int iMaskStride2, int bitDepth, ComponentID compID );

  double        getMotionLambda     ()                      const { return m_dLambdaMotionSAD; }

  void          selectMotionLambda  ()                            { m_motionLambda = getMotionLambda(); }

  void          setPredictor        ( const Mv& rcMv )            { m_mvPredictor = rcMv; }

  void          setCostScale        ( int iCostScale )            { m_iCostScale = iCostScale; }

  Distortion    getCost             ( uint32_t b )          const { return Distortion( m_motionLambda * b ); }

  // for motion cost

  static uint32_t    xGetExpGolombNumberOfBits( int iVal )

  {

    CHECKD( iVal == std::numeric_limits<int>::min(), "Wrong value" );

#if ENABLE_SIMD_OPT && defined( TARGET_SIMD_X86 )

    // the proper Log2 is not restricted to 0...MAX_CU_SIZE

    return 1 + ( Log2( iVal <= 0 ? ( unsigned( -iVal ) << 1 ) + 1 : unsigned( iVal << 1 ) ) << 1 );

#else

    unsigned uiLength2 = 1, uiTemp2 = ( iVal <= 0 ) ? ( unsigned( -iVal ) << 1 ) + 1 : unsigned( iVal << 1 );

    while( uiTemp2 > MAX_CU_SIZE )

    {

      uiLength2 += ( MAX_CU_DEPTH << 1 );

      uiTemp2  >>=   MAX_CU_DEPTH;

    }

    return uiLength2 + ( Log2(uiTemp2) << 1 );

#endif

  }

  Distortion     getCostOfVectorWithPredictor( const int x, const int y, const unsigned imvShift )  { return Distortion( m_motionLambda * getBitsOfVectorWithPredictor(x, y, imvShift )); }

  uint32_t       getBitsOfVectorWithPredictor( const int x, const int y, const unsigned imvShift )  { return xGetExpGolombNumberOfBits(((x * (1 << m_iCostScale)) - m_mvPredictor.hor)>>imvShift) + xGetExpGolombNumberOfBits(((y * (1 << m_iCostScale)) - m_mvPredictor.ver)>>imvShift); }

  void           saveUnadjustedLambda ();

  void           setChromaFormat      ( ChromaFormat cf )   { m_cf = cf; }

  void           setPredictorsIBC     (Mv* pcMv)

  {

    for (int i = 0; i < 2; i++)

    {

      m_bvPredictors[i] = pcMv[i];

    }

  }

  void           getMotionCostIBC(int add) { m_dCostIBC = m_dLambdaMotionSAD + add; }

  Distortion     getBvCostMultiplePredsIBC(int x, int y, bool useIMV);

  static Distortion xGetSAD8          ( const DistParam& pcDtParam );

  static Distortion xGetSAD16         ( const DistParam& pcDtParam ); // needs to be public for xGetSAD_MxN_SIMD ( NOTE: they are all public in vvenc )

  static void       xGetSAD16X5       ( const DistParam& pcDtParam, Distortion* cost, bool isCalCentrePos ); // needs to be public for xGetSADX5_16xN_SIMD ( NOTE: they are all public in vvenc )

  static Distortion xGetSSE           ( const DistParam& pcDtParam );

  static Distortion xGetSSE4          ( const DistParam& pcDtParam );

  static Distortion xGetSSE8          ( const DistParam& pcDtParam );

  static Distortion xGetSSE16         ( const DistParam& pcDtParam );

  static Distortion xGetSSE32         ( const DistParam& pcDtParam );

  static Distortion xGetSSE64         ( const DistParam& pcDtParam );

  static Distortion xGetSSE128        ( const DistParam& pcDtParam );

  static Distortion xGetSAD           ( const DistParam& pcDtParam );

  static Distortion xGetSAD4          ( const DistParam& pcDtParam );

  static Distortion xGetSAD32         ( const DistParam& pcDtParam );

  static Distortion xGetSAD64         ( const DistParam& pcDtParam );

  static Distortion xGetSAD128        ( const DistParam& pcDtParam );

  static Distortion xGetSADwMask      ( const DistParam &pcDtParam );

  static void       xGetSAD8X5        ( const DistParam& pcDtParam, Distortion* cost, bool isCalCentrePos );

  static Distortion xCalcHADs2x2      ( const Pel* piOrg, const Pel* piCur, int iStrideOrg, int iStrideCur );

  static Distortion xGetHAD2SADs      ( const DistParam& pcDtParam );

  template<bool fastHad>

  static Distortion xGetHADs          ( const DistParam& pcDtParam );

#if defined(TARGET_SIMD_X86)  && ENABLE_SIMD_OPT_DIST

  template<X86_VEXT vext>

  static Distortion xGetSSE_SIMD    ( const DistParam& pcDtParam );

  template<int iWidth, X86_VEXT vext>

  static Distortion xGetSSE_NxN_SIMD( const DistParam& pcDtParam );

  template<X86_VEXT vext>

  static Distortion xGetSAD_SIMD    ( const DistParam& pcDtParam );

  template<int iWidth, X86_VEXT vext>

  static Distortion xGetSAD_NxN_SIMD( const DistParam& pcDtParam );

  template <X86_VEXT vext>

  static void xGetSADX5_8xN_SIMD    ( const DistParam& rcDtParam, Distortion* cost, bool isCalCentrePos );

  template <X86_VEXT vext>

  static void xGetSADX5_16xN_SIMD_X86   ( const DistParam& rcDtParam, Distortion* cost, bool isCalCentrePos );

  template<X86_VEXT vext, bool fastHad>

  static Distortion xGetHADs_SIMD   ( const DistParam& pcDtParam );

  template<X86_VEXT vext>

  static Distortion xGetHAD2SADs_SIMD( const DistParam &rcDtParam );

  template<X86_VEXT vext> 

  static Distortion xGetSADwMask_SIMD( const DistParam &pcDtParam );

#endif

  unsigned int   getBitsMultiplePredsIBC(int x, int y, bool useIMV);

  Distortion   getDistPart( const CPelBuf& org, const CPelBuf& cur, int bitDepth, const ComponentID compId, DFunc eDFunc );

  void initLumaLevelToWeightTable( int lumaBD );

};// END CLASS DEFINITION RdCost

} // namespace vvenc

//! \}