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#ifndef XPETRA_TPETRAOPERATOR_HPP
#define XPETRA_TPETRAOPERATOR_HPP

#include "Xpetra_TpetraConfigDefs.hpp"

#include <Tpetra_Operator.hpp>

#include "Xpetra_Map.hpp"
#include "Xpetra_TpetraMap.hpp"
#include "Xpetra_MultiVector.hpp"
#include "Xpetra_TpetraMultiVector.hpp"
#include "Xpetra_Operator.hpp"

#include "Xpetra_Utils.hpp"

namespace Xpetra {

  template <class Scalar        = Operator<>::scalar_type,
            class LocalOrdinal  = typename Operator<Scalar>::local_ordinal_type,
            class GlobalOrdinal = typename Operator<Scalar, LocalOrdinal>::global_ordinal_type,
            class Node          = typename Operator<Scalar, LocalOrdinal, GlobalOrdinal>::node_type>
  class TpetraOperator : public Operator< Scalar, LocalOrdinal, GlobalOrdinal, Node > {
  public:
    //@{

    //! The Map associated with the domain of this operator, which must be compatible with X.getMap().
    virtual Teuchos::RCP<const Map<LocalOrdinal,GlobalOrdinal,Node> > getDomainMap() const {
      XPETRA_MONITOR("TpetraOperator::getDomainMap()");
      return toXpetra(op_->getDomainMap());
    }

    //! The Map associated with the range of this operator, which must be compatible with Y.getMap().
    virtual Teuchos::RCP<const Map<LocalOrdinal,GlobalOrdinal,Node> > getRangeMap() const {
      XPETRA_MONITOR("TpetraOperator::getRangeMap()");
      return toXpetra(op_->getRangeMap());
    }

    //! \brief Computes the operator-multivector application.
    /*! Loosely, performs \f$Y = \alpha \cdot A^{\textrm{mode}} \cdot X + \beta \cdot Y\f$. However, the details of operation
        vary according to the values of \c alpha and \c beta. Specifically
        - if <tt>beta == 0</tt>, apply() <b>must</b> overwrite \c Y, so that any values in \c Y (including NaNs) are ignored.
        - if <tt>alpha == 0</tt>, apply() <b>may</b> short-circuit the operator, so that any values in \c X (including NaNs) are ignored.
     */
    virtual void
    apply (const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &X,
           MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &Y,
           Teuchos::ETransp mode = Teuchos::NO_TRANS,
           Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
           Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const {
      op_->apply(toTpetra(X), toTpetra(Y), mode, alpha, beta);
    }

    /// \brief Whether this operator supports applying the transpose or conjugate transpose.
    virtual bool hasTransposeApply() const {
      return op_->hasTransposeApply();
    }

    //@}

    //! @name Overridden from Teuchos::Describable
    //@{

    //! A simple one-line description of this object.
    std::string description() const { XPETRA_MONITOR("TpetraOperator::description"); return op_->description(); }

    //! Print the object with the given verbosity level to a FancyOStream.
    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const {
      XPETRA_MONITOR("TpetraOperator::describe"); op_->describe(out, verbLevel);
    }

    //@}

    //! @name Xpetra specific
    //@{

    //! TpetraOperator constructor to wrap a Tpetra::Operator object
    TpetraOperator(const Teuchos::RCP<Tpetra::Operator< Scalar, LocalOrdinal, GlobalOrdinal, Node> > &op) : op_(op) { } //TODO removed const

    //@}

  private:
    //! The Tpetra::Operator which this class wraps.
    RCP< Tpetra::Operator< Scalar, LocalOrdinal, GlobalOrdinal, Node> > op_;

  }; // TpetraOperator class



#if ((!defined(HAVE_TPETRA_INST_SERIAL)) && (!defined(HAVE_TPETRA_INST_INT_INT)))
  // specialization for Tpetra Map on EpetraNode and GO=int
  template <>
  class TpetraOperator<double, int, int, EpetraNode>
      : public Operator< double, int, int, EpetraNode > {
  public:
    typedef double Scalar;
    typedef int GlobalOrdinal;
    typedef int LocalOrdinal;
    typedef EpetraNode Node;

    //@{

    //! The Map associated with the domain of this operator, which must be compatible with X.getMap().
    virtual Teuchos::RCP<const Map<LocalOrdinal,GlobalOrdinal,Node> > getDomainMap() const {
      return Teuchos::null;
    }

    //! The Map associated with the range of this operator, which must be compatible with Y.getMap().
    virtual Teuchos::RCP<const Map<LocalOrdinal,GlobalOrdinal,Node> > getRangeMap() const {
      return Teuchos::null;
    }

    //! \brief Computes the operator-multivector application.
    /*! Loosely, performs \f$Y = \alpha \cdot A^{\textrm{mode}} \cdot X + \beta \cdot Y\f$. However, the details of operation
        vary according to the values of \c alpha and \c beta. Specifically
        - if <tt>beta == 0</tt>, apply() <b>must</b> overwrite \c Y, so that any values in \c Y (including NaNs) are ignored.
        - if <tt>alpha == 0</tt>, apply() <b>may</b> short-circuit the operator, so that any values in \c X (including NaNs) are ignored.
     */
    virtual void
    apply (const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &X,
           MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &Y,
           Teuchos::ETransp mode = Teuchos::NO_TRANS,
           Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
           Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const {  }

    /// \brief Whether this operator supports applying the transpose or conjugate transpose.
    virtual bool hasTransposeApply() const {  return false;  }

    //@}

    //! @name Overridden from Teuchos::Describable
    //@{

    //! A simple one-line description of this object.
    std::string description() const { return std::string(""); }

    //! Print the object with the given verbosity level to a FancyOStream.
    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const {   }

    //@}

    //! @name Xpetra specific
    //@{

    //! TpetraOperator constructor to wrap a Tpetra::Operator object
    TpetraOperator(const Teuchos::RCP<Tpetra::Operator< Scalar, LocalOrdinal, GlobalOrdinal, Node> > &op) { }

    //@}

  }; // TpetraOperator class
#endif


#if ((!defined(HAVE_TPETRA_INST_SERIAL)) && (!defined(HAVE_TPETRA_INST_INT_LONG_LONG)))
  // specialization for Tpetra Map on EpetraNode and GO=int
  template <>
  class TpetraOperator<double, int, long long, EpetraNode>
      : public Operator< double, int, long long, EpetraNode > {
  public:
    typedef double Scalar;
    typedef long long GlobalOrdinal;
    typedef int LocalOrdinal;
    typedef EpetraNode Node;

    //@{

    //! The Map associated with the domain of this operator, which must be compatible with X.getMap().
    virtual Teuchos::RCP<const Map<LocalOrdinal,GlobalOrdinal,Node> > getDomainMap() const {
      return Teuchos::null;
    }

    //! The Map associated with the range of this operator, which must be compatible with Y.getMap().
    virtual Teuchos::RCP<const Map<LocalOrdinal,GlobalOrdinal,Node> > getRangeMap() const {
      return Teuchos::null;
    }

    //! \brief Computes the operator-multivector application.
    /*! Loosely, performs \f$Y = \alpha \cdot A^{\textrm{mode}} \cdot X + \beta \cdot Y\f$. However, the details of operation
        vary according to the values of \c alpha and \c beta. Specifically
        - if <tt>beta == 0</tt>, apply() <b>must</b> overwrite \c Y, so that any values in \c Y (including NaNs) are ignored.
        - if <tt>alpha == 0</tt>, apply() <b>may</b> short-circuit the operator, so that any values in \c X (including NaNs) are ignored.
     */
    virtual void
    apply (const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &X,
           MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &Y,
           Teuchos::ETransp mode = Teuchos::NO_TRANS,
           Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
           Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const {  }

    /// \brief Whether this operator supports applying the transpose or conjugate transpose.
    virtual bool hasTransposeApply() const {  return false;  }

    //@}

    //! @name Overridden from Teuchos::Describable
    //@{

    //! A simple one-line description of this object.
    std::string description() const { return std::string(""); }

    //! Print the object with the given verbosity level to a FancyOStream.
    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const {   }

    //@}

    //! @name Xpetra specific
    //@{

    //! TpetraOperator constructor to wrap a Tpetra::Operator object
    TpetraOperator(const Teuchos::RCP<Tpetra::Operator< Scalar, LocalOrdinal, GlobalOrdinal, Node> > &op) { }

    //@}

  }; // TpetraOperator class
#endif

} // Xpetra namespace

#define XPETRA_TPETRAOPERATOR_SHORT
#endif // XPETRA_TPETRAOPERATOR_HPP
