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#include "ParameterSetManager.h"

namespace vvdec

{

ParameterSetManager::ActivePSs ParameterSetManager::xActivateParameterSets( const bool isFirstSlice, const Slice* pSlicePilot, const PicHeader* picHeader, const bool rejectSpsChangeInClvs )

{

  PPS* pps = getPPS( picHeader->getPPSId() );

  CHECK( pps == 0, "No PPS present" );

  SPS* sps = getSPS( pps->getSPSId() );

  CHECK( sps == 0, "No SPS present" );

  if( isFirstSlice )

  {

    CHECK( !pps->pcv->isCorrect( *sps, *pps ), "PPS has PCV already, but values chaged???" );

    // the SPS may only change at the start of a CLVS (IRAP or GDR with NoOutputBeforeRecoveryFlag = 1)

    const NalUnitType nut     = pSlicePilot->getNalUnitType();

    const bool        isClvss = nut >= NAL_UNIT_CODED_SLICE_IDR_W_RADL && nut <= NAL_UNIT_CODED_SLICE_GDR

                                && !pps->getMixedNaluTypesInPicFlag() && picHeader->getNoOutputBeforeRecoveryFlag();

    if( rejectSpsChangeInClvs && !isClvss && m_activeSPSId >= 0 )

    {

      CHECK( pps->getSPSId() != m_activeSPSId, "a different SPS was activated within a CLVS" );

      CHECK( sps->getChangedFlag(), "the SPS content changed within a CLVS" );

    }

    sps->clearChangedFlag();

    pps->clearChangedFlag();

    // APS NAL units can't occur between the slices of a picture, so any APS change after this point is an error

    m_apsMap.clearChangedFlags();

    if( false == activatePPS( picHeader->getPPSId(), pSlicePilot->isIRAP() ) )

    {

      THROW_RECOVERABLE( "Parameter set activation failed!" );

    }

    m_alfAPSs.fill( nullptr );

    m_apsMap.clearActive();

  }

  // luma APSs

  for( int i = 0; i < pSlicePilot->getAlfApsIdsLuma().size(); i++ )

  {

    int apsId = pSlicePilot->getAlfApsIdsLuma()[i];

    APS *alfApsL = getAPS( apsId, ALF_APS );

    if( alfApsL )

    {

      m_alfAPSs[apsId] = alfApsL;

      if( false == activateAPS( apsId, ALF_APS ) )

      {

        THROW_RECOVERABLE( "APS activation failed!" );

      }

      CHECK( sps->getUseCCALF() == false && ( alfApsL->getCcAlfAPSParam().newCcAlfFilter[0] || alfApsL->getCcAlfAPSParam().newCcAlfFilter[1] ),

             "When sps_ccalf_enabled_flag is 0, the values of alf_cc_cb_filter_signal_flag and alf_cc_cr_filter_signal_flag shall be equal to 0" );

      CHECK( sps->getChromaFormatIdc() == CHROMA_400 && alfApsL->chromaPresentFlag,

             "When ChromaArrayType is equal to 0, the value of aps_chroma_present_flag of an ALF_APS shall be equal to 0" );

    }

  }

  if( pSlicePilot->getAlfEnabledFlag( COMPONENT_Cb ) || pSlicePilot->getAlfEnabledFlag( COMPONENT_Cr ) )

  {

    // chroma APS

    int apsId = pSlicePilot->getAlfApsIdChroma();

    APS* alfApsC = getAPS( apsId , ALF_APS );

    if( alfApsC )

    {

      m_alfAPSs[apsId] = alfApsC;

      if( false == activateAPS( apsId, ALF_APS ) )

      {

        THROW_RECOVERABLE( "APS activation failed!" );

      }

      CHECK( sps->getUseCCALF() == false && ( alfApsC->getCcAlfAPSParam().newCcAlfFilter[0] || alfApsC->getCcAlfAPSParam().newCcAlfFilter[1] ),

             "When sps_ccalf_enabled_flag is 0, the values of alf_cc_cb_filter_signal_flag and alf_cc_cr_filter_signal_flag shall be equal to 0" );

    }

  }

  if( pSlicePilot->getCcAlfCbEnabledFlag() )

  {

    if( !m_alfAPSs[pSlicePilot->getCcAlfCbApsId()] )

    {

      int apsId = pSlicePilot->getCcAlfCbApsId();

      APS *aps = getAPS( apsId, ALF_APS );

      if( aps )

      {

        m_alfAPSs[apsId] = aps;

        if( false == activateAPS( apsId, ALF_APS ) )

        {

          THROW_RECOVERABLE( "APS activation failed!" );

        }

      }

    }

  }

  if( pSlicePilot->getCcAlfCrEnabledFlag() )

  {

    if( !m_alfAPSs[pSlicePilot->getCcAlfCrApsId()] )

    {

      int apsId = pSlicePilot->getCcAlfCrApsId();

      APS *aps = getAPS( apsId, ALF_APS );

      if( aps )

      {

        m_alfAPSs[apsId] = aps;

        if( false == activateAPS( apsId, ALF_APS ) )

        {

          THROW_RECOVERABLE( "APS activation failed!" );

        }

      }

    }

  }

  APS* lmcsAPS = nullptr;

  if( picHeader->getLmcsAPSId() != -1 )

  {

    lmcsAPS = getAPS( picHeader->getLmcsAPSId(), LMCS_APS );

    CHECK( lmcsAPS == 0, "No LMCS APS present" );

  }

  if( lmcsAPS )

  {

    if( false == activateAPS( picHeader->getLmcsAPSId(), LMCS_APS ) )

    {

      THROW_RECOVERABLE( "LMCS APS activation failed!" );

    }

    CHECK( sps->getChromaFormatIdc() == CHROMA_400 && lmcsAPS->chromaPresentFlag,

           "When ChromaArrayType is equal to 0, the value of aps_chroma_present_flag of an LMCS_APS shall be equal to 0");

    CHECK( lmcsAPS->getReshaperAPSInfo().maxNbitsNeededDeltaCW - 1 < 0 || lmcsAPS->getReshaperAPSInfo().maxNbitsNeededDeltaCW - 1 > sps->getBitDepth() - 2,

           "The value of lmcs_delta_cw_prec_minus1 of an LMCS_APS shall be in the range of 0 to BitDepth 2, inclusive" );

  }

  APS* scalingListAPS = nullptr;

  if( picHeader->getScalingListAPSId() != -1 )

  {

    scalingListAPS = getAPS( picHeader->getScalingListAPSId(), SCALING_LIST_APS );

    CHECK( scalingListAPS == 0, "No ScalingList APS present" );

  }

  if( scalingListAPS )

  {

    if( false == activateAPS( picHeader->getScalingListAPSId(), SCALING_LIST_APS ) )

    {

      THROW_RECOVERABLE( "LMCS APS activation failed!" );

    }

    CHECK( ( sps->getChromaFormatIdc() == CHROMA_400 && scalingListAPS->chromaPresentFlag ) || ( sps->getChromaFormatIdc() != CHROMA_400 && !scalingListAPS->chromaPresentFlag ),

           "The value of aps_chroma_present_flag of the APS NAL unit having aps_params_type equal to SCALING_APS and adaptation_parameter_set_id equal to ph_scaling_list_aps_id shall be equal to ChromaArrayType  = =  0 ? 0 : 1" );

  }

  return { sps, pps, &m_alfAPSs, lmcsAPS, scalingListAPS };

}

//! activate a PPS and depending on isIDR parameter also SPS

//! \returns true, if activation is successful

bool ParameterSetManager::activatePPS( int ppsId, bool isIRAP )

{

  PPS* pps = m_ppsMap.getPS( ppsId );

  if( pps )

  {

    int spsId = pps->getSPSId();

    {

      SPS* sps = m_spsMap.getPS( spsId );

      if( sps )

      {

        int vpsId = sps->getVPSId();

        if( vpsId != 0 )

        {

          VPS *vps = m_vpsMap.getPS(vpsId);

          if( vps )

          {

            m_activeVPSId = vpsId;

            m_vpsMap.setActive(vpsId);

          }

          else

          {

            msg( WARNING, "Warning: tried to activate PPS that refers to non-existing VPS." );

          }

        }

        else

        {

          //No actual VPS

          m_activeVPSId = -1;

          m_vpsMap.clearActive();

        }

        m_spsMap.clearActive();

        m_spsMap.setActive( spsId );

        m_activeSPSId = spsId;

        m_ppsMap.clearActive();

        m_ppsMap.setActive( ppsId );

        return true;

      }

      else

      {

        msg( WARNING, "Warning: tried to activate a PPS that refers to a non-existing SPS." );

      }

    }

  }

  else

  {

    msg( WARNING, "Warning: tried to activate non-existing PPS." );

  }

  // Failed to activate if reach here.

  m_activeSPSId = -1;

  return false;

}

bool ParameterSetManager::activateAPS( int apsId, int apsType )

{

  APS* aps = m_apsMap.getPS( ( apsId << NUM_APS_TYPE_LEN ) + apsType );

  if( aps )

  {

    m_apsMap.setActive( ( apsId << NUM_APS_TYPE_LEN ) + apsType );

    return true;

  }

  else

  {

    msg( WARNING, "Warning: tried to activate non-existing APS." );

  }

  return false;

}

}