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//                        Kokkos v. 2.0
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#ifndef KOKKOS_TEST_DYNAMICVIEW_HPP
#define KOKKOS_TEST_DYNAMICVIEW_HPP

#include <gtest/gtest.h>
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <Kokkos_Core.hpp>

#include <Kokkos_DynamicView.hpp>
#include <impl/Kokkos_Timer.hpp>

namespace Test {

template< typename Scalar , class Space >
struct TestDynamicView
{
  typedef typename Space::execution_space  execution_space ;
  typedef typename Space::memory_space     memory_space ;

  typedef Kokkos::Experimental::DynamicView<Scalar*,Space> view_type;

  typedef double value_type;

  static void run( unsigned arg_total_size )
  {
    // Test: Create DynamicView, initialize size (via resize), run through parallel_for to set values, check values (via parallel_reduce); resize values and repeat
    //   Case 1: min_chunk_size is a power of 2
    {
      view_type da("da", 1024, arg_total_size );
      ASSERT_EQ( da.size(), 0 );
      // Init
      unsigned da_size = arg_total_size / 8;
      da.resize_serial(da_size);
      ASSERT_EQ( da.size(), da_size );

#if defined( KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA )
#if !defined(KOKKOS_ENABLE_CUDA) || ( 8000 <= CUDA_VERSION )
      Kokkos::parallel_for( Kokkos::RangePolicy<execution_space>(0, da_size), KOKKOS_LAMBDA ( const int i )
          {
          da(i) = Scalar(i);
          }
          );

      value_type result_sum = 0.0;
      Kokkos::parallel_reduce( Kokkos::RangePolicy<execution_space>(0, da_size), KOKKOS_LAMBDA ( const int i, value_type& partial_sum )
          {
          partial_sum += (value_type)da(i);
          }
          , result_sum
          );

      ASSERT_EQ(result_sum, (value_type)( da_size * (da_size - 1) / 2 ) );
#endif
#endif

      // add 3x more entries i.e. 4x larger than previous size
      // the first 1/4 should remain the same
      unsigned da_resize = arg_total_size / 2;
      da.resize_serial(da_resize);
      ASSERT_EQ( da.size(), da_resize );

#if defined( KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA )
#if !defined(KOKKOS_ENABLE_CUDA) || ( 8000 <= CUDA_VERSION )
      Kokkos::parallel_for( Kokkos::RangePolicy<execution_space>(da_size, da_resize), KOKKOS_LAMBDA ( const int i )
          {
          da(i) = Scalar(i);
          }
          );

      value_type new_result_sum = 0.0;
      Kokkos::parallel_reduce( Kokkos::RangePolicy<execution_space>(da_size, da_resize), KOKKOS_LAMBDA ( const int i, value_type& partial_sum )
          {
          partial_sum += (value_type)da(i);
          }
          , new_result_sum
          );

      ASSERT_EQ(new_result_sum+result_sum, (value_type)( da_resize * (da_resize - 1) / 2 ) );
#endif
#endif
    } // end scope

    // Test: Create DynamicView, initialize size (via resize), run through parallel_for to set values, check values (via parallel_reduce); resize values and repeat
    //   Case 2: min_chunk_size is NOT a power of 2
    {
      view_type da("da", 1023, arg_total_size );
      ASSERT_EQ( da.size(), 0 );
      // Init
      unsigned da_size = arg_total_size / 8;
      da.resize_serial(da_size);
      ASSERT_EQ( da.size(), da_size );

#if defined( KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA )
#if !defined(KOKKOS_ENABLE_CUDA) || ( 8000 <= CUDA_VERSION )
      Kokkos::parallel_for( Kokkos::RangePolicy<execution_space>(0, da_size), KOKKOS_LAMBDA ( const int i )
          {
          da(i) = Scalar(i);
          }
          );

      value_type result_sum = 0.0;
      Kokkos::parallel_reduce( Kokkos::RangePolicy<execution_space>(0, da_size), KOKKOS_LAMBDA ( const int i, value_type& partial_sum )
          {
          partial_sum += (value_type)da(i);
          }
          , result_sum
          );

      ASSERT_EQ(result_sum, (value_type)( da_size * (da_size - 1) / 2 ) );
#endif
#endif

      // add 3x more entries i.e. 4x larger than previous size
      // the first 1/4 should remain the same
      unsigned da_resize = arg_total_size / 2;
      da.resize_serial(da_resize);
      ASSERT_EQ( da.size(), da_resize );

#if defined( KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA )
#if !defined(KOKKOS_ENABLE_CUDA) || ( 8000 <= CUDA_VERSION )
      Kokkos::parallel_for( Kokkos::RangePolicy<execution_space>(da_size, da_resize), KOKKOS_LAMBDA ( const int i )
          {
          da(i) = Scalar(i);
          }
          );

      value_type new_result_sum = 0.0;
      Kokkos::parallel_reduce( Kokkos::RangePolicy<execution_space>(da_size, da_resize), KOKKOS_LAMBDA ( const int i, value_type& partial_sum )
          {
          partial_sum += (value_type)da(i);
          }
          , new_result_sum
          );

      ASSERT_EQ(new_result_sum+result_sum, (value_type)( da_resize * (da_resize - 1) / 2 ) );
#endif
#endif
    } // end scope

    // Test: Create DynamicView, initialize size (via resize), run through parallel_for to set values, check values (via parallel_reduce); resize values and repeat
    //   Case 3: resize reduces the size
    {
      view_type da("da", 1023, arg_total_size );
      ASSERT_EQ( da.size(), 0 );
      // Init
      unsigned da_size = arg_total_size / 2;
      da.resize_serial(da_size);
      ASSERT_EQ( da.size(), da_size );

#if defined( KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA )
#if !defined(KOKKOS_ENABLE_CUDA) || ( 8000 <= CUDA_VERSION )
      Kokkos::parallel_for( Kokkos::RangePolicy<execution_space>(0, da_size), KOKKOS_LAMBDA ( const int i )
          {
          da(i) = Scalar(i);
          }
          );

      value_type result_sum = 0.0;
      Kokkos::parallel_reduce( Kokkos::RangePolicy<execution_space>(0, da_size), KOKKOS_LAMBDA ( const int i, value_type& partial_sum )
          {
          partial_sum += (value_type)da(i);
          }
          , result_sum
          );

      ASSERT_EQ(result_sum, (value_type)( da_size * (da_size - 1) / 2 ) );
#endif
#endif

      // remove the final 3/4 entries i.e. first 1/4 remain
      unsigned da_resize = arg_total_size / 8;
      da.resize_serial(da_resize);
      ASSERT_EQ( da.size(), da_resize );

#if defined( KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA )
#if !defined(KOKKOS_ENABLE_CUDA) || ( 8000 <= CUDA_VERSION )
      Kokkos::parallel_for( Kokkos::RangePolicy<execution_space>(0, da_resize), KOKKOS_LAMBDA ( const int i )
          {
          da(i) = Scalar(i);
          }
          );

      value_type new_result_sum = 0.0;
      Kokkos::parallel_reduce( Kokkos::RangePolicy<execution_space>(0, da_resize), KOKKOS_LAMBDA ( const int i, value_type& partial_sum )
          {
          partial_sum += (value_type)da(i);
          }
          , new_result_sum
          );

      ASSERT_EQ(new_result_sum, (value_type)( da_resize * (da_resize - 1) / 2 ) );
#endif
#endif
    } // end scope

  }
};

TEST_F( TEST_CATEGORY , dynamic_view )
{
  typedef TestDynamicView< double , TEST_EXECSPACE >
    TestDynView ;

  for ( int i = 0 ; i < 10 ; ++i ) {
    TestDynView::run( 100000 + 100 * i );
  }
}

} // namespace Test

#endif /* #ifndef KOKKOS_TEST_DYNAMICVIEW_HPP */

