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/** \file     CodingStructure.h

 *  \brief    A class managing the coding information for a specific image part

 */

#pragma once

#include "Rom.h"

#include "Unit.h"

#include "Buffer.h"

#include "CommonDef.h"

#include "UnitPartitioner.h"

#include "Slice.h"

#include <vector>

namespace vvdec

{

struct Picture;

enum PictureType

{

  PIC_RECONSTRUCTION,

  PIC_RECON_WRAP,

  NUM_PIC_TYPES

};

#define NUM_PARTS_IN_CTU ( MAX_CU_SIZE * MAX_CU_SIZE ) >> (   MIN_CU_LOG2       << 1 )

// num collocated motion

#define NUM_COMOT_IN_CTU ( MAX_CU_SIZE * MAX_CU_SIZE ) >> ( ( MIN_CU_LOG2 + 1 ) << 1 )

struct CtuAlfData

{

  uint8_t ccAlfFilterControl[MAX_NUM_COMPONENT - 1];

  uint8_t alfCtuEnableFlag  [MAX_NUM_COMPONENT];

  uint8_t alfCtuAlternative [MAX_NUM_COMPONENT - 1];

  short   alfCtbFilterIndex;

  CtuAlfData() : ccAlfFilterControl{ 0, 0 }, alfCtuEnableFlag{ 0, 0, 0 } {}

};

struct CtuData

{

  SAOBlkParam           saoParam;

  CtuAlfData            alfParam;

  const Slice*          slice;

  const PPS*            pps;

  const SPS*            sps;

  const PicHeader*      ph;

  int                   lineIdx, colIdx, ctuIdx;

  CodingUnit           *firstCU, *lastCU;

  unsigned              numCUs, numTUs;

  ptrdiff_t             predBufOffset;

  ptrdiff_t             dmvrMvCacheOffset;

  CodingUnit**          cuPtr  [MAX_NUM_CHANNEL_TYPE];

  LoopFilterParam*      lfParam[NUM_EDGE_DIR];

  MotionInfo*           motion;

  ColocatedMotionInfo*  colMotion;

};

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

// coding structure

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

class CodingStructure

{

public:

  UnitArea         area;

  Picture         *picture;

  UnitScale        unitScale[MAX_NUM_COMPONENT];

  int              chromaQpAdj;

  std::shared_ptr<const VPS> vps;

  std::shared_ptr<const SPS> sps;

  std::shared_ptr<const PPS> pps;

  std::shared_ptr<PicHeader> picHeader;

  std::shared_ptr<const APS> alfApss[ALF_CTB_MAX_NUM_APS];

  std::shared_ptr<const APS> lmcsAps;

  const PreCalcValues*       pcv;

  std::unique_ptr<CtuData[]> m_ctuData;

  size_t                     m_ctuDataSize;

  // data for which memory is partially borrowed from DecLibRecon

  Pel*              m_predBuf;

  Mv*               m_dmvrMvCache;

  // end of partially borrowed data

  CodingStructure( CUChunkCache* cuChunkCache, TUChunkCache* tuChunkCache );

  ~CodingStructure() { destroy(); }

  void create(const UnitArea &_unit);

  void create(const ChromaFormat &_chromaFormat, const Area& _area);

  void destroy();

  void resetForUse();

  void rebindPicBufs();

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

  // global accessors

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

#if _DEBUG

  const CodingUnit*     getCU(Position pos, ChannelType _chType) const

  {

    if( area.blocks[_chType].contains( pos ) )

    {

      int rsAddr = ctuRsAddr( pos, _chType );

      int inCtu  = inCtuPos ( pos, _chType );

      return getCtuData( rsAddr ).cuPtr[_chType][inCtu];

    }

    else return nullptr;

  }

  CodingUnit*     getCU(Position pos, ChannelType _chType)

  {

    if( area.blocks[_chType].contains( pos ) )

    {

      int rsAddr = ctuRsAddr( pos, _chType );

      int inCtu  = inCtuPos ( pos, _chType );

      return getCtuData( rsAddr ).cuPtr[_chType][inCtu];

    }

    else return nullptr;

  }

#else

  const CodingUnit*     getCU(Position pos, ChannelType _chType) const { if( area.blocks[_chType].contains( pos ) ) return getCtuData( ctuRsAddr( pos, _chType ) ).cuPtr[_chType][inCtuPos( pos, _chType )]; else return nullptr; }

        CodingUnit*     getCU(Position pos, ChannelType _chType)       { if( area.blocks[_chType].contains( pos ) ) return getCtuData( ctuRsAddr( pos, _chType ) ).cuPtr[_chType][inCtuPos( pos, _chType )]; else return nullptr; }

#endif

  const CodingUnit*     getCURestricted(const Position &pos, const Position curPos, const unsigned curSliceIdx, const unsigned curTileIdx, const ChannelType _chType) const;

  const CodingUnit*     getCURestricted(const Position &pos, const CodingUnit& curCu,                                                      const ChannelType _chType, const CodingUnit* guess = nullptr) const;

  CodingUnit&     addCU(const UnitArea &unit, const ChannelType _chType, const TreeType treeType, const ModeType modeType, const CodingUnit* cuLeft, const CodingUnit* cuAbove );

  TransformUnit&  addTU(const UnitArea &unit, const ChannelType _chType, CodingUnit &cu);

  void            addEmptyTUs(Partitioner &partitioner, CodingUnit& cu);

  CUTraverser     traverseCUs(const int ctuRsAddr);

  void initStructData();

  void allocTempInternals();

  void deallocTempInternals();

  void createInternals(const UnitArea& _unit);

  CUCache    m_cuCache;

  TUCache    m_tuCache;

  PelStorage m_reco;

  PelStorage m_rec_wrap;

  unsigned int         m_widthInCtus;

  PosType              m_ctuSizeMask[2];

  PosType              m_ctuWidthLog2[2];

  std::unique_ptr<CodingUnit*[]>         m_cuMap;

  ptrdiff_t                              m_cuMapSize;

  std::unique_ptr<ColocatedMotionInfo[]> m_colMiMap;

  ptrdiff_t                              m_colMiMapSize;

public:

  // in CTU coordinates

  int ctuRsAddr( int col, int line ) const { return col + ( line * m_widthInCtus ); }

  // in sample coordinates

  int ctuRsAddr( Position pos, ChannelType chType ) const { Position posL = recalcPosition( area.chromaFormat, chType, CH_L, pos ); return ctuRsAddr( posL.x >> pcv->maxCUWidthLog2, posL.y >> pcv->maxCUHeightLog2 ); }

  // 4x4 luma block position within the CTU

  int inCtuPos ( Position pos, ChannelType chType ) const { return ( unitScale[chType].scaleHor( pos.x ) & m_ctuSizeMask[chType] ) + ( ( unitScale[chType].scaleVer( pos.y ) & m_ctuSizeMask[chType] ) << m_ctuWidthLog2[chType] ); }

  // 8x8 luma block position within the CTU

  int colMotPos( Position pos )                     const { return ( g_colMiScaling.scaleHor( pos.x ) & ( m_ctuSizeMask[CH_L] >> 1 ) ) + ( ( g_colMiScaling.scaleVer( pos.y ) & ( m_ctuSizeMask[CH_L] >> 1 ) ) << ( m_ctuWidthLog2[CH_L] - 1 ) ); }

        CtuData& getCtuData( int col, int line )       { return m_ctuData[ctuRsAddr( col, line )]; }

  const CtuData& getCtuData( int col, int line ) const { return m_ctuData[ctuRsAddr( col, line )]; }

        CtuData& getCtuData( int addr )       { return m_ctuData[addr]; }

  const CtuData& getCtuData( int addr ) const { return m_ctuData[addr]; }

  int m_IBCBufferWidth;

  std::vector<PelStorage> m_virtualIBCbuf;

  std::vector<char>       hasIbcBlock;

  void initVIbcBuf( int numCtuLines, ChromaFormat chromaFormatIDC, int ctuSize );

  void fillIBCbuffer( CodingUnit &cu, int lineIdx );

  MotionBuf getMotionBuf( const     Area& _area );

  MotionBuf getMotionBuf( const UnitArea& _area ) { return getMotionBuf( _area.Y() ); }

  const CMotionBuf getMotionBuf( const     Area& _area ) const;

  const CMotionBuf getMotionBuf( const UnitArea& _area ) const { return getMotionBuf( _area.Y() ); }

        MotionInfo& getMotionInfo( const Position& pos )       { return getCtuData( ctuRsAddr( pos, CH_L ) ).motion[inCtuPos( pos, CH_L )]; }

  const MotionInfo& getMotionInfo( const Position& pos ) const { return getCtuData( ctuRsAddr( pos, CH_L ) ).motion[inCtuPos( pos, CH_L )]; }

  const ColocatedMotionInfo& getColInfo( const Position &pos, const Slice*& pColSlice ) const;

  LoopFilterParam const* getLFPMapPtr   ( const DeblockEdgeDir edgeDir, ptrdiff_t _ctuRsAddr ) const { return m_ctuData[_ctuRsAddr].lfParam[edgeDir]; }

  LoopFilterParam      * getLFPMapPtr   ( const DeblockEdgeDir edgeDir, ptrdiff_t _ctuRsAddr )       { return m_ctuData[_ctuRsAddr].lfParam[edgeDir]; }

  ptrdiff_t              get4x4MapStride() const { return ( ptrdiff_t( 1 ) << m_ctuWidthLog2[CH_L] ); }

  UnitScale getScaling( const UnitScale::ScaliningType type, const ChannelType chType = CH_L ) const

  {

    return type == UnitScale::MI_MAP ? g_miScaling : unitScale[chType];

  }

public:

         PelBuf       getRecoBuf(const CompArea &blk)        { return m_reco.bufs[blk.compID()].subBuf( blk ); }

  const CPelBuf       getRecoBuf(const CompArea &blk) const  { return m_reco.bufs[blk.compID()].subBuf( blk ); }

         PelUnitBuf   getRecoBuf(const UnitArea &unit)       { return m_reco.subBuf( unit ); }

  const CPelUnitBuf   getRecoBuf(const UnitArea &unit) const { return m_reco.subBuf( unit ); }

  // reco buffer

         PelBuf       getRecoBuf(const ComponentID compID, bool wrap=false)         { return wrap ? m_rec_wrap.get(compID) : m_reco.get(compID); }

  const CPelBuf       getRecoBuf(const ComponentID compID, bool wrap=false)   const { return wrap ? m_rec_wrap.get(compID) : m_reco.get(compID); }

         PelUnitBuf   getRecoBuf(bool wrap=false)                                   { return wrap ? m_rec_wrap : m_reco; }

  const CPelUnitBuf   getRecoBuf(bool wrap=false)                             const { return wrap ? m_rec_wrap : m_reco; }

         PelUnitBuf   getPredBuf(const CodingUnit &cu);

  const CPelUnitBuf   getPredBuf(const CodingUnit &cu) const;

};

}