/*!
   \file axis_algorithm_reduce_domain.cpp
   \author Ha NGUYEN
   \since 23 June 2016
   \date 23 June 2016

   \brief Algorithm for reduce a domain to an axis
 */
#include "axis_algorithm_reduce_domain.hpp"
#include "reduce_domain_to_axis.hpp"
#include "axis.hpp"
#include "domain.hpp"
#include "grid.hpp"
#include "grid_transformation_factory_impl.hpp"
#include "reduction.hpp"

namespace xios {
CGenericAlgorithmTransformation* CAxisAlgorithmReduceDomain::create(CGrid* gridDst, CGrid* gridSrc,
                                                                   CTransformation<CAxis>* transformation,
                                                                   int elementPositionInGrid,
                                                                   std::map<int, int>& elementPositionInGridSrc2ScalarPosition,
                                                                   std::map<int, int>& elementPositionInGridSrc2AxisPosition,
                                                                   std::map<int, int>& elementPositionInGridSrc2DomainPosition,
                                                                   std::map<int, int>& elementPositionInGridDst2ScalarPosition,
                                                                   std::map<int, int>& elementPositionInGridDst2AxisPosition,
                                                                   std::map<int, int>& elementPositionInGridDst2DomainPosition)
{
  std::vector<CAxis*> axisListDestP = gridDst->getAxis();
  std::vector<CDomain*> domainListSrcP = gridSrc->getDomains();

  CReduceDomainToAxis* reduceDomain = dynamic_cast<CReduceDomainToAxis*> (transformation);
  int axisDstIndex   = elementPositionInGridDst2AxisPosition[elementPositionInGrid];
  int domainSrcIndex = elementPositionInGridSrc2DomainPosition[elementPositionInGrid];

  return (new CAxisAlgorithmReduceDomain(axisListDestP[axisDstIndex], domainListSrcP[domainSrcIndex], reduceDomain));
}

bool CAxisAlgorithmReduceDomain::registerTrans()
{
  CGridTransformationFactory<CAxis>::registerTransformation(TRANS_REDUCE_DOMAIN_TO_AXIS, create);
}


CAxisAlgorithmReduceDomain::CAxisAlgorithmReduceDomain(CAxis* axisDestination, CDomain* domainSource, CReduceDomainToAxis* algo)
 : CAxisAlgorithmTransformation(axisDestination, domainSource), reduction_(0)
{
  algo->checkValid(axisDestination, domainSource);
  StdString op;
  switch (algo->operation)
  {
    case CReduceDomainToAxis::operation_attr::sum:
      op = "sum";
      break;
    case CReduceDomainToAxis::operation_attr::min:
      op = "min";
      break;
    case CReduceDomainToAxis::operation_attr::max:
      op = "max";
      break;
    case CReduceDomainToAxis::operation_attr::average:
      op = "average";
      break;
    default:
        ERROR("CAxisAlgorithmReduceDomain::CAxisAlgorithmReduceDomain(CAxis* axisDestination, CDomain* domainSource, CReduceDomainToAxis* algo)",
         << "Operation is wrongly defined. Supported operations: sum, min, max, average." << std::endl
         << "Domain source " <<domainSource->getId() << std::endl
         << "Axis destination " << axisDestination->getId());

  }

  dir_ = (CReduceDomainToAxis::direction_attr::iDir == algo->direction)  ? iDir : jDir;
  reduction_ = CReductionAlgorithm::createOperation(CReductionAlgorithm::ReductionOperations[op]);
}

void CAxisAlgorithmReduceDomain::apply(const std::vector<std::pair<int,double> >& localIndex,
                                       const double* dataInput,
                                       CArray<double,1>& dataOut,
                                       std::vector<bool>& flagInitial,                     
                                       bool ignoreMissingValue)
{
  reduction_->apply(localIndex, dataInput, dataOut, flagInitial, ignoreMissingValue);
}

void CAxisAlgorithmReduceDomain::updateData(CArray<double,1>& dataOut)
{
  reduction_->updateData(dataOut);
}

CAxisAlgorithmReduceDomain::~CAxisAlgorithmReduceDomain()
{
  if (0 != reduction_) delete reduction_;
}

void CAxisAlgorithmReduceDomain::computeIndexSourceMapping_(const std::vector<CArray<double,1>* >& dataAuxInputs)
{
  this->transformationMapping_.resize(1);
  this->transformationWeight_.resize(1);

  TransformationIndexMap& transMap = this->transformationMapping_[0];
  TransformationWeightMap& transWeight = this->transformationWeight_[0];

  CArray<int,1>& axisDstIndex = axisDest_->index;
  int ni_glo = domainSrc_->ni_glo, nj_glo = domainSrc_->nj_glo;
  if (iDir == dir_)
  {
    int nbAxisIdx = axisDstIndex.numElements();
    for (int idxAxis = 0; idxAxis < nbAxisIdx; ++idxAxis)
    {
      int globalAxisIdx = axisDstIndex(idxAxis);
      transMap[globalAxisIdx].resize(ni_glo);
      transWeight[globalAxisIdx].resize(ni_glo);
      for (int idx = 0; idx < ni_glo; ++idx)
      {
        transMap[globalAxisIdx][idx] = globalAxisIdx * ni_glo + idx;
        transWeight[globalAxisIdx][idx] = 1.0;
      }
    }
  }
  else if (jDir == dir_)
  {
    int nbAxisIdx = axisDstIndex.numElements();
    for (int idxAxis = 0; idxAxis < nbAxisIdx; ++idxAxis)
    {
      int globalAxisIdx = axisDstIndex(idxAxis);
      transMap[globalAxisIdx].resize(nj_glo);
      transWeight[globalAxisIdx].resize(nj_glo);
      for (int idx = 0; idx < nj_glo; ++idx)
      {
        transMap[globalAxisIdx][idx] = globalAxisIdx + ni_glo*idx;
        transWeight[globalAxisIdx][idx] = 1.0;
      }
    }
  }
  else
  {}
}

}