/*
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//
//                        Kokkos v. 3.0
//       Copyright (2020) National Technology & Engineering
//               Solutions of Sandia, LLC (NTESS).
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// Under the terms of Contract DE-NA0003525 with NTESS,
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#include <Kokkos_Core.hpp>

#define KOKKOS_PRAGMA_UNROLL(a)

namespace {

template <class Scalar, class ExecutionSpace>
struct SumPlain {
  using execution_space = ExecutionSpace;
  using type            = typename Kokkos::View<Scalar*, execution_space>;

  type view;

  SumPlain(type view_) : view(view_) {}

  KOKKOS_INLINE_FUNCTION
  void operator()(int /*i*/, Scalar& val) { val += Scalar(); }
};

template <class Scalar, class ExecutionSpace>
struct SumInitJoinFinalValueType {
  using execution_space = ExecutionSpace;
  using type            = typename Kokkos::View<Scalar*, execution_space>;
  using value_type      = Scalar;

  type view;

  SumInitJoinFinalValueType(type view_) : view(view_) {}

  KOKKOS_INLINE_FUNCTION
  void init(value_type& val) const { val = value_type(); }

  KOKKOS_INLINE_FUNCTION
  void join(volatile value_type& val, volatile value_type& src) const {
    val += src;
  }

  KOKKOS_INLINE_FUNCTION
  void operator()(int /*i*/, value_type& val) const { val += value_type(); }
};

template <class Scalar, class ExecutionSpace>
struct SumInitJoinFinalValueType2 {
  using execution_space = ExecutionSpace;
  using type            = typename Kokkos::View<Scalar*, execution_space>;
  using value_type      = Scalar;

  type view;

  SumInitJoinFinalValueType2(type view_) : view(view_) {}

  KOKKOS_INLINE_FUNCTION
  void init(volatile value_type& val) const { val = value_type(); }

  KOKKOS_INLINE_FUNCTION
  void join(volatile value_type& val, const volatile value_type& src) const {
    val += src;
  }

  KOKKOS_INLINE_FUNCTION
  void operator()(int /*i*/, value_type& val) const { val += value_type(); }
};

template <class Scalar, class ExecutionSpace>
struct SumInitJoinFinalValueTypeArray {
  using execution_space = ExecutionSpace;
  using type            = typename Kokkos::View<Scalar*, execution_space>;
  using value_type      = Scalar[];

  type view;
  int n;

  SumInitJoinFinalValueTypeArray(type view_, int n_) : view(view_), n(n_) {}

  KOKKOS_INLINE_FUNCTION
  void init(value_type val) const {
    for (int k = 0; k < n; k++) {
      val[k] = 0;
    }
  }

  KOKKOS_INLINE_FUNCTION
  void join(volatile value_type val, const volatile value_type src) const {
    for (int k = 0; k < n; k++) {
      val[k] += src[k];
    }
  }

  KOKKOS_INLINE_FUNCTION
  void operator()(int i, value_type val) const {
    for (int k = 0; k < n; k++) {
      val[k] += k * i;
    }
  }
};

template <class Scalar, class ExecutionSpace>
struct SumWrongInitJoinFinalValueType {
  using execution_space = ExecutionSpace;
  using type            = typename Kokkos::View<Scalar*, execution_space>;
  using value_type      = Scalar;

  type view;

  SumWrongInitJoinFinalValueType(type view_) : view(view_) {}

  KOKKOS_INLINE_FUNCTION
  void init(double& val) const { val = double(); }

  KOKKOS_INLINE_FUNCTION
  void join(volatile value_type& val, const value_type& src) const {
    val += src;
  }

  KOKKOS_INLINE_FUNCTION
  void operator()(int /*i*/, value_type& val) const { val += value_type(); }
};

template <class Scalar, class ExecutionSpace>
void TestTemplateMetaFunctions() {
  using type = typename Kokkos::View<Scalar*, ExecutionSpace>;
  type a("A", 100);
  /*
    int sum_plain_has_init_arg = Kokkos::Impl::FunctorHasInit< SumPlain<Scalar,
    ExecutionSpace>, Scalar & >::value; ASSERT_EQ( sum_plain_has_init_arg, 0 );
    int sum_initjoinfinalvaluetype_has_init_arg = Kokkos::Impl::FunctorHasInit<
    SumInitJoinFinalValueType<Scalar, ExecutionSpace>, Scalar >::value;
    ASSERT_EQ( sum_initjoinfinalvaluetype_has_init_arg, 1 );
    int sum_initjoinfinalvaluetype_has_init_arg2 = Kokkos::Impl::FunctorHasInit<
    SumInitJoinFinalValueType2<Scalar,ExecutionSpace>, Scalar >::value;
    ASSERT_EQ( sum_initjoinfinalvaluetype_has_init_arg2, 1 );
    int sum_wronginitjoinfinalvaluetype_has_init_arg =
    Kokkos::Impl::FunctorHasInit< SumWrongInitJoinFinalValueType<Scalar,
    ExecutionSpace>, Scalar >::value; ASSERT_EQ(
    sum_wronginitjoinfinalvaluetype_has_init_arg, 0 );

    //int sum_initjoinfinalvaluetypearray_has_init_arg =
    Kokkos::Impl::FunctorHasInit< SumInitJoinFinalValueTypeArray<Scalar,
    ExecutionSpace>, Scalar[] >::value;
    //ASSERT_EQ( sum_initjoinfinalvaluetypearray_has_init_arg, 1 );

    //printf( "Values Init: %i %i %i\n", sum_plain_has_init_arg,
    sum_initjoinfinalvaluetype_has_init_arg,
    sum_wronginitjoinfinalvaluetype_has_init_arg );

    int sum_plain_has_join_arg = Kokkos::Impl::FunctorHasJoin< SumPlain<Scalar,
    ExecutionSpace>, Scalar >::value; ASSERT_EQ( sum_plain_has_join_arg, 0 );
    int sum_initjoinfinalvaluetype_has_join_arg = Kokkos::Impl::FunctorHasJoin<
    SumInitJoinFinalValueType<Scalar, ExecutionSpace>, Scalar >::value;
    ASSERT_EQ( sum_initjoinfinalvaluetype_has_join_arg, 1 );
    int sum_initjoinfinalvaluetype_has_join_arg2 = Kokkos::Impl::FunctorHasJoin<
    SumInitJoinFinalValueType2<Scalar, ExecutionSpace>, Scalar >::value;
    ASSERT_EQ( sum_initjoinfinalvaluetype_has_join_arg2, 1 );
    int sum_wronginitjoinfinalvaluetype_has_join_arg =
    Kokkos::Impl::FunctorHasJoin< SumWrongInitJoinFinalValueType<Scalar,
    ExecutionSpace>, Scalar >::value; ASSERT_EQ(
    sum_wronginitjoinfinalvaluetype_has_join_arg, 0 );

    //printf( "Values Join: %i %i %i\n", sum_plain_has_join_arg,
    sum_initjoinfinalvaluetype_has_join_arg,
    sum_wronginitjoinfinalvaluetype_has_join_arg );
  */
}

}  // namespace

namespace Test {
TEST(TEST_CATEGORY, template_meta_functions) {
  TestTemplateMetaFunctions<int, TEST_EXECSPACE>();
}
}  // namespace Test