/*
//@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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// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
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// 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.
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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
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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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 );

  ASSERT_EQ( 0 , host_tracking(0) );
}

}

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