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#pragma once

#include "CommonLib/CommonDef.h"

#include "CommonLib/Picture.h"

#include "DecSlice.h"

#include "SEIread.h"

#include "NALread.h"

#include "HLSyntaxReader.h"

#include "CommonLib/ParameterSetManager.h"

#include <unordered_set>

namespace vvdec

{

class InputNALUnit;

class ThreadPool;

class DecLib;

class PicListManager;

class DecLibParser

{

private:

  NalUnitType m_associatedIRAPType[MAX_VPS_LAYERS];   ///< NAL unit type of the associated IRAP picture

  int         m_pocCRA            [MAX_VPS_LAYERS];   ///< POC number of the latest CRA picture

  int         m_pocRandomAccess      = MAX_INT;       ///< POC number of the random access point (the first IDR or CRA picture)

  int         m_decodingOrderCounter = 0;

  uint32_t    m_prevLayerID          = MAX_INT;

  int m_prevPOC                   = MAX_INT;

  int m_prevTid0POC               = 0;

  int  m_skippedPOC               = 0;

  bool m_warningMessageSkipPicture = false;

  bool m_prevSliceSkipped         = false;

  bool m_bFirstSliceInPicture     = true;

  bool m_bFirstSliceInSequence[MAX_VPS_LAYERS] = { true };

  bool m_bFirstSliceInBitstream   = true;

  int      m_lastPOCNoOutputPriorPics                       = -1;

  bool     m_isNoOutputPriorPics                            = false;

  bool     m_lastNoOutputBeforeRecoveryFlag[MAX_VPS_LAYERS] = { false };   // value of variable NoOutputBeforeRecoveryFlag of the assocated CRA/GDR pic

  int      m_gdrRecoveryPointPocVal        [MAX_VPS_LAYERS];

  bool     m_gdrRecovered                  [MAX_VPS_LAYERS] = { false };

  uint32_t m_uiSliceSegmentIdx    = 0;

  int m_nonVCLbits                = 0;

  Picture* m_pcParsePic           = nullptr;

  Slice*   m_apcSlicePilot        = nullptr;

  DCI*     m_dci                  = nullptr;

  struct AccessUnitPicInfo

  {

    NalUnitType m_nalUnitType; ///< nal_unit_type

    uint32_t    m_temporalId;  ///< temporal_id

    uint32_t    m_nuhLayerId;  ///< nuh_layer_id

    int         m_POC;

  };

  std::vector<AccessUnitPicInfo> m_accessUnitPicInfo;

  struct NalUnitInfo

  {

    NalUnitType m_nalUnitType; ///< nal_unit_type

    uint32_t    m_nuhLayerId;  ///< nuh_layer_id

    uint32_t    m_firstCTUinSlice; /// the first CTU in slice, specified with raster scan order ctu address

    int         m_POC;             /// the picture order

  };

  std::vector<NalUnitInfo>  m_nalUnitInfo[MAX_VPS_LAYERS];

  std::vector<NalUnitType>  m_pictureUnitNals;

  std::list<InputNALUnit>   m_pictureSeiNalus;

  std::list<InputNALUnit>   m_prefixSEINALUs;   /// Buffered up prefix SEI NAL Units.

  std::ostream*             m_pDecodedSEIOutputStream = nullptr;

  seiMessages               m_seiMessageList;       ///< List of SEI messages that have been received before the first slice and between slices,

                                                    ///< excluding prefix SEIs...

  HRD                       m_HRD;

  ThreadPool*               m_threadPool = nullptr;

  // functional classes

  HLSyntaxReader            m_HLSReader;

  SEIReader                 m_seiReader;

  DecSlice                  m_cSliceDecoder;

  DecLib&                   m_decLib;

  ParameterSetManager       m_parameterSetManager;   // storage for parameter sets

  PicListManager&           m_picListManager;

  std::shared_ptr<PicHeader> m_picHeader;            // picture header

  unsigned int              m_numDecThreads   = 0;

  unsigned int              m_parseFrameDelay = 0;

  PicList                   m_parseFrameList;

  PicList                   m_dpbReferencePics;   // this mirrors the reference pictures from the DPB but is only used for parsing

  std::unordered_set<int>   m_tmpSeenPocs;

  int                       m_maxPicReconSkip = 1;

  ErrHandlingFlags          m_errHandlingFlags = ERR_HANDLING_OFF;

  CUChunkCache              m_cuChunkCache;

  TUChunkCache              m_tuChunkCache;

public:

  DecLibParser( DecLib& decLib, PicListManager& picListManager ) : m_decLib( decLib ), m_picListManager( picListManager ) {}

  ~DecLibParser();

  void create                   ( ThreadPool* tp, int parserFrameDelay, int numReconInst, int numDecThreads, ErrHandlingFlags errHandlingFlags );

  void destroy                  ();

#if 0

  void fillMissingPicBuf        ( Picture* pcPic, bool copyClosest );

#endif

  bool     parse                ( InputNALUnit& nalu );

  Picture* getNextDecodablePicture();

  void checkNoOutputPriorPics   ();

  void setNoOutputPriorPicsFlag (bool val)              { m_isNoOutputPriorPics = val; }

  bool getNoOutputPriorPicsFlag () const                { return m_isNoOutputPriorPics; }

  void setDecodedSEIMessageOutputStream( std::ostream* pOpStream ) { m_pDecodedSEIOutputStream = pOpStream; }

  void checkAPSInPictureUnit    ();

  void resetPictureUnitNals     ()                      { m_pictureUnitNals.clear(); }

  const ParameterSetManager& getParameterSetManager() const { return m_parameterSetManager; }

private:

  bool xDecodeSliceHead( InputNALUnit& nalu );

  bool xDecodeSliceMain( InputNALUnit& nalu );

  void xActivateParameterSets( const int layerId );

  void prepareUnavailablePicture( bool isLost, const PPS* pps, int iUnavailablePoc, const int layerId, const bool longTermFlag, const int temporalId );

  void applyReferencePictureListBasedMarking( Slice* currSlice, const int layerId, const PPS& pps );

  void xParsePrefixSEImessages();

  void xParsePrefixSEIsForUnknownVCLNal();

  void xDecodePicHeader       ( InputNALUnit& nalu );

  void xDecodeVPS             ( InputNALUnit& nalu );

  void xDecodeDCI             ( InputNALUnit& nalu );

  void xDecodeSPS             ( InputNALUnit& nalu );

  void xDecodePPS             ( InputNALUnit& nalu );

  void xDecodeAPS             ( InputNALUnit& nalu );

  void xUpdatePreviousTid0POC ( Slice* pSlice );

  bool isRandomAccessSkipPicture();

  void xCheckMixedNalUnit     ( Slice* pcSlice, const InputNALUnit& nalu );

  void waitForPicsToFinishParsing( const std::vector<Picture*>& refPics );

};

}