/* -----------------------------------------------------------------------------
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Copyright (c) 2018-2026, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. & The VVdeC Authors.
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------------------------------------------------------------------------------------------- */

#include "ParameterSetManager.h"

namespace vvdec
{

ParameterSetManager::ActivePSs ParameterSetManager::xActivateParameterSets( const bool isFirstSlice, const Slice* pSlicePilot, const PicHeader* picHeader )
{
  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???" );

    sps->clearChangedFlag();
    pps->clearChangedFlag();

    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 )
    {
      if( isFirstSlice ) alfApsL->clearChangedFlag();
      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 )
    {
      if( isFirstSlice ) alfApsC->clearChangedFlag();
      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( isFirstSlice ) lmcsAPS->clearChangedFlag();
    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( isFirstSlice ) scalingListAPS->clearChangedFlag();

    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;
}

}
