/* -----------------------------------------------------------------------------

The copyright in this software is being made available under the Clear BSD

License, included below. No patent rights, trademark rights and/or 

other Intellectual Property Rights other than the copyrights concerning 

the Software are granted under this license.

The Clear BSD License

Copyright (c) 2019-2026, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. & The VVenC Authors.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification,

are permitted (subject to the limitations in the disclaimer below) provided that

the following conditions are met:

     * Redistributions of source code must retain the above copyright notice,

     this list of conditions and the following disclaimer.

     * Redistributions in binary form must reproduce the above copyright

     notice, this list of conditions and the following disclaimer in the

     documentation and/or other materials provided with the distribution.

     * Neither the name of the copyright holder nor the names of its

     contributors may be used to endorse or promote products derived from this

     software without specific prior written permission.

NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY

THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND

CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR

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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

------------------------------------------------------------------------------------------- */

#pragma once

#include "CommonLib/Contexts.h"

#include "CommonLib/BitStream.h"

#include "CommonLib/dtrace_next.h"

//! \ingroup EncoderLib

//! \{

namespace vvenc {

class BinStore

{

public:

  BinStore () : m_inUse(false), m_allocated(false)  {}

  ~BinStore()                                       {}

  void  reset   ()

  {

    if( m_inUse )

    {

      for( unsigned n = 0; n < Ctx::NumberOfContexts; n++ )

      {

        m_binBuffer[n].clear();

      }

    }

  }

  void  addBin  ( unsigned bin, unsigned ctxId )

  {

    if( m_inUse )

    {

      std::vector<bool>& binBuffer = m_binBuffer[ctxId];

      if( binBuffer.size() < m_maxNumBins )

      {

        binBuffer.push_back( bin == 1 );

      }

    }

  }

  void                      setUse      ( bool useStore )         { m_inUse = useStore; if(m_inUse){xCheckAlloc();} }

  bool                      inUse       ()                  const { return m_inUse; }

  const std::vector<bool>&  getBinVector( unsigned ctxId )  const { return m_binBuffer[ctxId]; }

private:

  void  xCheckAlloc()

  {

    if( !m_allocated )

    {

      m_binBuffer.resize( Ctx::NumberOfContexts );

      for( unsigned n = 0; n < Ctx::NumberOfContexts; n++ )

      {

        m_binBuffer[n].reserve( m_maxNumBins );

      }

      m_allocated = true;

    }

  }

private:

  static const std::size_t          m_maxNumBins = 100000;

  bool                              m_inUse;

  bool                              m_allocated;

  std::vector< std::vector<bool> >  m_binBuffer;

};

class BinEncIf : public Ctx

{

protected:

  template <class BinProbModel>

  BinEncIf( const BinProbModel* dummy ) : Ctx( dummy ) {}

public:

  virtual ~BinEncIf() {}

public:

  virtual void      init              ( OutputBitstream* bitstream )        = 0;

  virtual void      uninit            ()                                    = 0;

  virtual void      start             ()                                    = 0;

  virtual void      finish            ()                                    = 0;

  virtual void      restart           ()                                    = 0;

  virtual void      reset             ( int qp, int initId )                = 0;

public:

  virtual void      resetBits         ()                                    = 0;

  virtual uint64_t  getEstFracBits    ()                              const = 0;

  virtual unsigned  getNumBins        ( unsigned    ctxId )           const = 0;

public:

  virtual void      encodeBin         ( unsigned bin,   unsigned ctxId    ) = 0;

  virtual void      encodeBinEP       ( unsigned bin                      ) = 0;

  virtual void      encodeBinsEP      ( unsigned bins,  unsigned numBins  ) = 0;

  virtual void      encodeRemAbsEP    ( unsigned bins,

                                        unsigned goRicePar,

                                        unsigned cutoff,

                                        int      maxLog2TrDynamicRange    ) = 0;

  virtual void      encodeBinTrm      ( unsigned bin                      ) = 0;

  virtual void      align             ()                                    = 0;

public:

  virtual uint32_t  getNumBins        ()                                    = 0;

  virtual bool      isEncoding        ()                                    = 0;

  virtual unsigned  getNumWrittenBits ()                                    = 0;

public:

  virtual void            setBinStorage     ( bool b )                      = 0;

  virtual const BinStore* getBinStore       ()                        const = 0;

  virtual BinEncIf*       getTestBinEncoder ()                        const = 0;

};

class BinCounter

{

public:

  BinCounter();

  ~BinCounter() {}

public:

  void      reset   ();

  void      addCtx  ( unsigned ctxId )          { m_NumBinsCtx[ctxId]++; }

  void      addEP   ( unsigned num   )          { m_NumBinsEP+=num; }

  void      addEP   ()                          { m_NumBinsEP++; }

  void      addTrm  ()                          { m_NumBinsTrm++; }

  uint32_t  getAll  ()                  const;

  uint32_t  getCtx  ( unsigned ctxId )  const   { return m_NumBinsCtx[ctxId]; }

  uint32_t  getEP   ()                  const   { return m_NumBinsEP; }

  uint32_t  getTrm  ()                  const   { return m_NumBinsTrm; }

private:

  std::vector<uint32_t> m_CtxBinsCodedBuffer;

  uint32_t*             m_NumBinsCtx;

  uint32_t              m_NumBinsEP;

  uint32_t              m_NumBinsTrm;

};

class BinEncoderBase : public BinEncIf, public BinCounter

{

protected:

  BinEncoderBase ( const BinProbModel* dummy );

public:

  ~BinEncoderBase() {}

public:

  void      init    ( OutputBitstream* bitstream );

  void      uninit  ();

  void      start   ();

  void      finish  ();

  void      restart ();

  void      reset   ( int qp, int initId );

  void      resetBits           ();

  uint64_t  getEstFracBits      ()                    const { THROW( "not supported" ); return 0; }

  unsigned  getNumBins          ( unsigned ctxId )    const { return BinCounter::getCtx(ctxId); }

  void      encodeBinEP         ( unsigned bin                      );

  void      encodeBinsEP        ( unsigned bins,  unsigned numBins  );

  void      encodeRemAbsEP      ( unsigned bins,

                                  unsigned goRicePar,

                                  unsigned cutoff,

                                  int      maxLog2TrDynamicRange    );

  void      encodeBinTrm        ( unsigned bin                      );

  void      align               ();

  unsigned  getNumWrittenBits   () { return ( m_Bitstream->getNumberOfWrittenBits() + 8 * m_numBufferedBytes + 23 - m_bitsLeft ); }

  uint32_t  getNumBins          ()                          { return BinCounter::getAll(); }

  bool      isEncoding          ()                          { return true; }

protected:

  void      encodeAlignedBinsEP ( unsigned bins,  unsigned numBins  );

  void      writeOut            ();

protected:

  OutputBitstream* m_Bitstream;

  uint32_t         m_Low;

  uint32_t         m_Range;

  uint32_t         m_bufferedByte;

  int32_t          m_numBufferedBytes;

  int32_t          m_bitsLeft;

  BinStore         m_BinStore;

};

class BinEncoder : public BinEncoderBase

{

public:

  BinEncoder ();

  ~BinEncoder() {}

  void  encodeBin   ( unsigned bin, unsigned ctxId );

public:

  void            setBinStorage     ( bool b )          { m_BinStore.setUse(b); }

  const BinStore* getBinStore       ()          const   { return &m_BinStore; }

  BinEncIf*       getTestBinEncoder ()          const;

private:

  CtxStore& m_Ctx;

};

class BitEstimatorBase : public BinEncIf

{

protected:

  BitEstimatorBase ( const BinProbModel* dummy );

public:

  ~BitEstimatorBase() {}

public:

  void      init                ( OutputBitstream* bitstream )        {}

  void      uninit              ()                                    {}

  void      start               ()                                    { m_EstFracBits = 0; }

  void      finish              ()                                    {}

  void      restart             ()                                    { m_EstFracBits = (m_EstFracBits >> SCALE_BITS) << SCALE_BITS; }

  void      reset               ( int qp, int initId )                { Ctx::init( qp, initId ); m_EstFracBits = 0;}

public:

  void      resetBits           ()                                    { m_EstFracBits = 0; }

  uint64_t  getEstFracBits      ()                              const { return m_EstFracBits; }

  unsigned  getNumBins          ( unsigned ctxId )              const { THROW( "not supported for BitEstimator" ); return 0; }

public:

  void      encodeBinEP         ( unsigned bin                      ) { m_EstFracBits += BinProbModelBase::estFracBitsEP (); }

  void      encodeBinsEP        ( unsigned bins,  unsigned numBins  ) { m_EstFracBits += BinProbModelBase::estFracBitsEP ( numBins ); }

  void      encodeRemAbsEP      ( unsigned bins,

                                  unsigned goRicePar,

                                  unsigned cutoff,

                                  int      maxLog2TrDynamicRange    );

  void      align               ();

public:

  uint32_t  getNumBins          ()                                      { THROW("Not supported"); return 0; }

  bool      isEncoding          ()                                      { return false; }

  unsigned  getNumWrittenBits   ()                                      { /*THROW( "Not supported" );*/ return (uint32_t)( 0/*m_EstFracBits*//* >> SCALE_BITS*/ ); }

protected:

  uint64_t                m_EstFracBits;

};

class BitEstimator : public BitEstimatorBase

{

public:

  BitEstimator ();

  ~BitEstimator() {}

  void encodeBin    ( unsigned bin, unsigned ctxId )  { m_Ctx[ctxId].estFracBitsUpdate( bin, m_EstFracBits ); }

  void encodeBinTrm ( unsigned bin )                  { m_EstFracBits += BinProbModel::estFracBitsTrm( bin ); }

  void            setBinStorage     ( bool b )        {}

  const BinStore* getBinStore       ()          const { return 0; }

  BinEncIf*       getTestBinEncoder ()          const { return 0; }

private:

  CtxStore& m_Ctx;

};

} // namespace vvenc

//! \}