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

   \brief Algorithm for reduce a domain to a scalar
 */
#include "scalar_algorithm_reduce_domain.hpp"
#include "domain.hpp"
#include "scalar.hpp"
#include "reduce_domain_to_scalar.hpp"
#include "grid.hpp"
#include "grid_transformation_factory_impl.hpp"

#include "reduction.hpp"

namespace xios {
CGenericAlgorithmTransformation* CScalarAlgorithmReduceDomain::create(CGrid* gridDst, CGrid* gridSrc,
                                                                     CTransformation<CScalar>* 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<CScalar*> scalarListDestP = gridDst->getScalars();
  std::vector<CDomain*> domainListSrcP  = gridSrc->getDomains();

  CReduceDomainToScalar* reduceDomain = dynamic_cast<CReduceDomainToScalar*> (transformation);
  int scalarDstIndex = elementPositionInGridDst2ScalarPosition[elementPositionInGrid];
  int domainSrcIndex = elementPositionInGridSrc2DomainPosition[elementPositionInGrid];

  return (new CScalarAlgorithmReduceDomain(scalarListDestP[scalarDstIndex], domainListSrcP[domainSrcIndex], reduceDomain));
}

bool CScalarAlgorithmReduceDomain::registerTrans()
{
  CGridTransformationFactory<CScalar>::registerTransformation(TRANS_REDUCE_DOMAIN_TO_SCALAR, create);
}

CScalarAlgorithmReduceDomain::CScalarAlgorithmReduceDomain(CScalar* scalarDestination, CDomain* domainSource, CReduceDomainToScalar* algo)
 : CScalarAlgorithmTransformation(scalarDestination, domainSource),
   reduction_(0)
{
  StdString op;
  switch (algo->operation)
  {
    case CReduceDomainToScalar::operation_attr::sum:
      op = "sum";
      break;
    case CReduceDomainToScalar::operation_attr::min:
      op = "min";
      break;
    case CReduceDomainToScalar::operation_attr::max:
      op = "max";
      break;
    case CReduceDomainToScalar::operation_attr::average:
      op = "average";
      break;
    default:
        ERROR("CScalarAlgorithmReduceDomain::CScalarAlgorithmReduceDomain(CDomain* domainDestination, CDomain* domainSource, CReduceDomainToScalar* algo)",
         << "Operation must be defined."
         << "Domain source " <<domainSource->getId() << std::endl
         << "Scalar destination " << scalarDestination->getId());

  }
  
  if (CReductionAlgorithm::ReductionOperations.end() == CReductionAlgorithm::ReductionOperations.find(op))
    ERROR("CScalarAlgorithmReduceDomain::CScalarAlgorithmReduceDomain(CDomain* domainDestination, CDomain* domainSource, CReduceDomainToScalar* algo)",
       << "Operation '" << op << "' not found. Please make sure to use a supported one"
       << "Domain source " <<domainSource->getId() << std::endl
       << "Scalar destination " << scalarDestination->getId());

  reduction_ = CReductionAlgorithm::createOperation(CReductionAlgorithm::ReductionOperations[op]);
}

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

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

void CScalarAlgorithmReduceDomain::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];

  int globalIndexSize = domainSrc_->ni_glo * domainSrc_->nj_glo;  

  transMap[0].resize(globalIndexSize);
  transWeight[0].resize(globalIndexSize, 1.0);
  for (int idx = 0; idx < globalIndexSize; ++idx)
  {     
    transMap[0][idx] = idx;    
  }
}

}