/*
//@HEADER
// ************************************************************************
//
//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
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// modification, are permitted provided that the following conditions are
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// 1. Redistributions of source code must retain the above copyright
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// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
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// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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// Questions? Contact Christian R. Trott (crtrott@sandia.gov)
//
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*/

#include <Kokkos_Core.hpp>

#define KOKKOS_PRAGMA_UNROLL(a)

namespace {

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

  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 {
  typedef ExecutionSpace execution_space;
  typedef typename Kokkos::View< Scalar*, execution_space > type;
  typedef Scalar value_type;

  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 {
  typedef ExecutionSpace execution_space;
  typedef typename Kokkos::View< Scalar*, execution_space > type;
  typedef Scalar value_type;

  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 {
  typedef ExecutionSpace execution_space;
  typedef typename Kokkos::View< Scalar*, execution_space > type;
  typedef Scalar value_type[];

  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 {
  typedef ExecutionSpace execution_space;
  typedef typename Kokkos::View< Scalar*, execution_space > type;
  typedef Scalar value_type;

  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() {
  typedef typename Kokkos::View< Scalar*, ExecutionSpace > type;
  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_F( TEST_CATEGORY, template_meta_functions )
{
  TestTemplateMetaFunctions< int, TEST_EXECSPACE >();
}
}

