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#ifndef KOKKOS_INNER_PRODUCT_SPACE_TRAITS_UQ_PCE_HPP
#define KOKKOS_INNER_PRODUCT_SPACE_TRAITS_UQ_PCE_HPP

#include "Sacado_UQ_PCE.hpp"
#include "Kokkos_InnerProductSpaceTraits.hpp"
#include "Kokkos_ArithTraits_UQ_PCE.hpp"

//----------------------------------------------------------------------------
// Specializations of Kokkos::InnerProductSpaceTraits for Sacado::UQ::PCE
// scalar type
//----------------------------------------------------------------------------

namespace Kokkos {
namespace Details {

template <typename S>
class InnerProductSpaceTraits< Sacado::UQ::PCE<S> > {
public:
  typedef Sacado::UQ::PCE<S> val_type;

  typedef typename val_type::value_type base_value_type;
  typedef typename val_type::ordinal_type ordinal_type;
  typedef InnerProductSpaceTraits<base_value_type> BIT;
  typedef typename BIT::dot_type base_dot_type;

  typedef typename ArithTraits<val_type>::mag_type mag_type;
  typedef base_dot_type dot_type;

  static KOKKOS_FORCEINLINE_FUNCTION
  mag_type norm (const val_type& x) {
    //return ArithTraits<val_type>::abs (x);
    const ordinal_type sz = x.size();
    mag_type nrm = mag_type(0);
    for (ordinal_type i=0; i<sz; ++i) {
      const mag_type n = BIT::norm( x.fastAccessCoeff(i) );
      nrm += n*n;
    }
    return std::sqrt(nrm);
  }

  static KOKKOS_FORCEINLINE_FUNCTION
  dot_type dot (const val_type& x, const val_type& y) {
    const ordinal_type xsz = x.size();
    const ordinal_type ysz = y.size();
    const ordinal_type sz = xsz > ysz ? xsz : ysz;

    dot_type r = dot_type(0);
    if (x.hasFastAccess(sz) && y.hasFastAccess(sz))
      for (ordinal_type i=0; i<sz; ++i)
        r += BIT::dot( x.fastAccessCoeff(i), y.fastAccessCoeff(i) );
    else
      for (ordinal_type i=0; i<sz; ++i)
        r += BIT::dot( x.coeff(i), y.coeff(i) );

    return r;
  }

};

template <typename S>
class InnerProductSpaceTraits< const Sacado::UQ::PCE<S> > {
public:
  typedef Sacado::UQ::PCE<S> val_type;

  typedef typename val_type::value_type base_value_type;
  typedef typename val_type::ordinal_type ordinal_type;
  typedef InnerProductSpaceTraits<base_value_type> BIT;
  typedef typename BIT::dot_type base_dot_type;

  typedef typename ArithTraits<val_type>::mag_type mag_type;
  typedef base_dot_type dot_type;

  static KOKKOS_FORCEINLINE_FUNCTION
  mag_type norm (const val_type& x) {
    //return ArithTraits<val_type>::abs (x);
    const ordinal_type sz = x.size();
    mag_type nrm = mag_type(0);
    for (ordinal_type i=0; i<sz; ++i) {
      const mag_type n = BIT::norm( x.fastAccessCoeff(i) );
      nrm += n*n;
    }
    return std::sqrt(nrm);
  }

  static KOKKOS_FORCEINLINE_FUNCTION
  dot_type dot (const val_type& x, const val_type& y) {
    const ordinal_type xsz = x.size();
    const ordinal_type ysz = y.size();
    const ordinal_type sz = xsz > ysz ? xsz : ysz;

    dot_type r = dot_type(0);
    if (x.hasFastAccess(sz) && y.hasFastAccess(sz))
      for (ordinal_type i=0; i<sz; ++i)
        r += BIT::dot( x.fastAccessCoeff(i), y.fastAccessCoeff(i) );
    else
      for (ordinal_type i=0; i<sz; ++i)
        r += BIT::dot( x.coeff(i), y.coeff(i) );

    return r;
  }

};

}
}

#endif /* #ifndef KOKKOS_INNER_PRODUCT_SPACE_TRAITS_UQ_PCE_HPP */
