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//        MueLu: A package for multigrid based preconditioning
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#ifndef MUELU_MERGEDBLOCKEDMATRIXFACTORY_DEF_HPP_
#define MUELU_MERGEDBLOCKEDMATRIXFACTORY_DEF_HPP_

#ifdef HAVE_MUELU_EXPERIMENTAL

#include <Xpetra_BlockedCrsMatrix.hpp>
#include <Xpetra_MultiVectorFactory.hpp>
#include <Xpetra_VectorFactory.hpp>
#include <Xpetra_MatrixFactory.hpp>
#include <Xpetra_Matrix.hpp>
#include <Xpetra_CrsMatrixWrap.hpp>
#include <Xpetra_BlockedCrsMatrix.hpp>
#include <Xpetra_CrsMatrix.hpp>
#include "MueLu_Level.hpp"
#include "MueLu_Monitor.hpp"
#include "MueLu_Utilities.hpp"
#include "MueLu_HierarchyHelpers.hpp"

#include "MueLu_MergedBlockedMatrixFactory.hpp"

namespace MueLu {

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
MergedBlockedMatrixFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::MergedBlockedMatrixFactory()
{ }

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
RCP<const ParameterList> MergedBlockedMatrixFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::GetValidParameterList() const {
  RCP<ParameterList> validParamList = rcp(new ParameterList());

  validParamList->set< RCP<const FactoryBase> >("A", MueLu::NoFactory::getRCP()/*Teuchos::null*/, "Generating factory of the matrix A used for building SchurComplement (must be a 2x2 blocked operator, default = MueLu::NoFactory::getRCP())");

  return validParamList;
}


template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void MergedBlockedMatrixFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level &currentLevel) const {
  Input(currentLevel, "A");
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void MergedBlockedMatrixFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Build(Level & currentLevel) const
{
  FactoryMonitor  m(*this, "MergedBlockedMatrix", currentLevel);
  Teuchos::RCP<Matrix> A = Get<RCP<Matrix> >(currentLevel, "A");

  RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A);
  TEUCHOS_TEST_FOR_EXCEPTION(bA == Teuchos::null, Exceptions::BadCast, "MueLu::MergedBlockedMatrixFactory::Build: input matrix A is not of type BlockedCrsMatrix! A generated by AFact_ must be a 2x2 block operator. error.");

  Teuchos::RCP<CrsMatrix>     mergedMat = bA->Merge();
  Teuchos::RCP<CrsMatrixWrap> mergedOp  = Teuchos::rcp(new CrsMatrixWrap(mergedMat));
  Teuchos::RCP<Matrix> mergedA          = Teuchos::rcp_dynamic_cast<Matrix>(mergedOp);

  {
    // note: variable "A" generated by this MergedBlockedMatrix factory is in fact the a merged version
    // of the blocked matrix A (from the input)
    Set(currentLevel, "A", mergedA);
  }
}

} // namespace MueLu

#endif /* HAVE_MUELU_EXPERIMENTAL */
#endif /* MUELU_MERGEDBLOCKEDMATRIXFACTORY_DEF_HPP_ */
