/*
//@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.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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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.
//
// 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
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Questions? Contact  H. Carter Edwards (hcedwar@sandia.gov)
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*/

#include <gtest/gtest.h>

#include <Kokkos_Core.hpp>
#include <stdexcept>
#include <sstream>
#include <iostream>

/*--------------------------------------------------------------------------*/

namespace Test {

template< class Space >
struct NestedView {

  Kokkos::View<int*,Space> member ;

public:

  KOKKOS_INLINE_FUNCTION
  NestedView() : member()
    {}

  KOKKOS_INLINE_FUNCTION
  NestedView & operator = ( const Kokkos::View<int*,Space> & lhs )
    {
      member = lhs ;
      if ( member.dimension_0() ) Kokkos::atomic_add( & member(0) , 1 );
      return *this ;
    }

  KOKKOS_INLINE_FUNCTION
  ~NestedView()
  { 
    if ( member.dimension_0() ) {
      Kokkos::atomic_add( & member(0) , -1 );
    }
  }
};

template< class Space >
struct NestedViewFunctor {

  Kokkos::View< NestedView<Space> * , Space > nested ;
  Kokkos::View<int*,Space>                    array ;

  NestedViewFunctor( 
    const Kokkos::View< NestedView<Space> * , Space > & arg_nested ,
    const Kokkos::View<int*,Space>                    & arg_array )
  : nested( arg_nested )
  , array(  arg_array )
  {}

  KOKKOS_INLINE_FUNCTION
  void operator()( int i ) const
    { nested[i] = array ; }
};


template< class Space >
void view_nested_view()
{
  Kokkos::View<int*,Space> tracking("tracking",1);

  typename Kokkos::View<int*,Space>::HostMirror
     host_tracking = Kokkos::create_mirror( tracking );

  {
    Kokkos::View< NestedView<Space> * , Space > a("a_nested_view",2);

    Kokkos::parallel_for( Kokkos::RangePolicy<Space>(0,2) , NestedViewFunctor<Space>( a , tracking ) );
    Kokkos::deep_copy( host_tracking , tracking );
    ASSERT_EQ( 2 , host_tracking(0) );

    Kokkos::View< NestedView<Space> * , Space > b("b_nested_view",2);
    Kokkos::parallel_for( Kokkos::RangePolicy<Space>(0,2) , NestedViewFunctor<Space>( b , tracking ) );
    Kokkos::deep_copy( host_tracking , tracking );
    ASSERT_EQ( 4 , host_tracking(0) );

  }
  Kokkos::deep_copy( host_tracking , tracking );

#if KOKKOS_USING_EXP_VIEW
  ASSERT_EQ( 0 , host_tracking(0) );
#endif

}

}

#if ! KOKKOS_USING_EXP_VIEW

namespace Kokkos {
namespace Impl {

template< class ExecSpace , class S >
struct ViewDefaultConstruct< ExecSpace , Test::NestedView<S> , true >
{
  typedef Test::NestedView<S> type ;
  type * const m_ptr ;

  KOKKOS_FORCEINLINE_FUNCTION
  void operator()( const typename ExecSpace::size_type& i ) const
    { new(m_ptr+i) type(); }

  ViewDefaultConstruct( type * pointer , size_t capacity )
    : m_ptr( pointer )
    {
      Kokkos::RangePolicy< ExecSpace > range( 0 , capacity );
      parallel_for( range , *this );
      ExecSpace::fence();
    }
};

} // namespace Impl
} // namespace Kokkos

#endif

/*--------------------------------------------------------------------------*/

