/*
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//
//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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#include <cstdio>

#include <gtest/gtest.h>

#include <Kokkos_Core.hpp>

namespace Test {

namespace {

template < typename ExecSpace >
struct TestViewCopy {

  using InExecSpace = ExecSpace;

  static void test_view_copy(const int dim0, const int dim1, const int dim2)
  {
#if defined( KOKKOS_ENABLE_CUDA ) || defined( KOKKOS_ENABLE_ROCM )
   // ExecSpace = CudaUVM, CudaHostPinned
   // This test will fail at runtime with an illegal memory access if something goes wrong
   // Test 1: deep_copy from host_mirror_space to ExecSpace and ExecSpace back to host_mirror_space
   {
    typedef Kokkos::View<double****,InExecSpace> Rank4ViewType;
    Rank4ViewType view_4;
    view_4 = Rank4ViewType("view_4", dim0, dim1, dim2, dim2);

    typedef typename Kokkos::Impl::is_space<InExecSpace>::host_mirror_space::execution_space host_space_type;
    Kokkos::View<double**,Kokkos::LayoutLeft,host_space_type> srcView("srcView", dim2, dim2);

    // Strided dst view
    auto dstView = Kokkos::subview(view_4, 0, 0, Kokkos::ALL(), Kokkos::ALL());

    // host_mirror_space to ExecSpace
    Kokkos::deep_copy( dstView, srcView );
    Kokkos::fence();

    // ExecSpace to host_mirror_space 
    Kokkos::deep_copy( srcView, dstView );
    Kokkos::fence();
   }

   // Test 2: deep_copy from Cuda to ExecSpace and ExecSpace back to Cuda
   {
    typedef Kokkos::View<double****,InExecSpace> Rank4ViewType;
    Rank4ViewType view_4;
    view_4 = Rank4ViewType("view_4", dim0, dim1, dim2, dim2);

#if defined( KOKKOS_ENABLE_CUDA )
    typedef typename std::conditional<
        Kokkos::Impl::MemorySpaceAccess<Kokkos::CudaSpace,typename InExecSpace::memory_space>::accessible,
        Kokkos::CudaSpace,
        InExecSpace>::type space_type;
#endif
#if defined( KOKKOS_ENABLE_ROCM )
    typedef typename std::conditional<
        Kokkos::Impl::MemorySpaceAccess<Kokkos::ROCmSpace,typename InExecSpace::memory_space>::accessible,
        Kokkos::ROCmSpace,
        InExecSpace>::type space_type;
#endif
    Kokkos::View<double**,Kokkos::LayoutLeft,space_type> srcView("srcView", dim2, dim2);

    // Strided dst view
    auto dstView = Kokkos::subview(view_4, 0, 0, Kokkos::ALL(), Kokkos::ALL());

    // Cuda to ExecSpace
    Kokkos::deep_copy( dstView, srcView );
    Kokkos::fence();

    // ExecSpace to Cuda
    Kokkos::deep_copy( srcView, dstView );
    Kokkos::fence();
   }

   // Test 3: deep_copy from host_space to ExecSpace and ExecSpace back to host_space
   {
    typedef Kokkos::View<double****,InExecSpace> Rank4ViewType;
    Rank4ViewType view_4;
    view_4 = Rank4ViewType("view_4", dim0, dim1, dim2, dim2);

    typedef Kokkos::HostSpace host_space_type;
    Kokkos::View<double**,Kokkos::LayoutLeft,host_space_type> srcView("srcView", dim2, dim2);

    // Strided dst view
    auto dstView = Kokkos::subview(view_4, 0, 0, Kokkos::ALL(), Kokkos::ALL());

    // host_space to ExecSpace
    Kokkos::deep_copy( dstView, srcView );
    Kokkos::fence();

    // ExecSpace to host_space 
    Kokkos::deep_copy( srcView, dstView );
    Kokkos::fence();
   }
#endif
  } // end test_view_copy

}; // end struct

} // namespace

TEST_F( TEST_CATEGORY , view_copy_tests ) {
  //Only include this file to be compiled with CudaUVM and CudaHostPinned
  TestViewCopy< TEST_EXECSPACE >::test_view_copy(4,2,3);
  TestViewCopy< TEST_EXECSPACE >::test_view_copy(4,2,0);
}

TEST_F( TEST_CATEGORY , view_copy_degenerated ) {
  //Only include this file to be compiled with CudaUVM and CudaHostPinned
  Kokkos::View<int*, Kokkos::MemoryTraits<Kokkos::Unmanaged>> v_um_def_1;
  Kokkos::View<int*, Kokkos::MemoryTraits<Kokkos::Unmanaged>> v_um_1( reinterpret_cast<int*>(-1), 0 );
  Kokkos::View<int*> v_m_def_1;
  Kokkos::View<int*> v_m_1("v_m_1", 0);

  Kokkos::View<int*, Kokkos::MemoryTraits<Kokkos::Unmanaged>> v_um_def_2;
  Kokkos::View<int*, Kokkos::MemoryTraits<Kokkos::Unmanaged>> v_um_2( reinterpret_cast<int*>(-1), 0 );
  Kokkos::View<int*> v_m_def_2;
  Kokkos::View<int*> v_m_2("v_m_2", 0);

  Kokkos::deep_copy(v_um_def_1, v_um_def_2);
  Kokkos::deep_copy(v_um_def_1, v_um_2);
  Kokkos::deep_copy(v_um_def_1, v_m_def_2);
  Kokkos::deep_copy(v_um_def_1, v_m_2);

  Kokkos::deep_copy(v_um_1, v_um_def_2);
  Kokkos::deep_copy(v_um_1, v_um_2);
  Kokkos::deep_copy(v_um_1, v_m_def_2);
  Kokkos::deep_copy(v_um_1, v_m_2);

  Kokkos::deep_copy(v_m_def_1, v_um_def_2);
  Kokkos::deep_copy(v_m_def_1, v_um_2);
  Kokkos::deep_copy(v_m_def_1, v_m_def_2);
  Kokkos::deep_copy(v_m_def_1, v_m_2);

  Kokkos::deep_copy(v_m_1, v_um_def_2);
  Kokkos::deep_copy(v_m_1, v_um_2);
  Kokkos::deep_copy(v_m_1, v_m_def_2);
  Kokkos::deep_copy(v_m_1, v_m_2);
}

} // namespace Test