/*
//@HEADER
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//
//                        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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#include <gtest/gtest.h>

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

namespace Test {

TEST_F( TEST_CATEGORY, view_remap )
{
  enum { N0 = 3, N1 = 2, N2 = 8, N3 = 9 };

  #ifdef KOKKOS_ENABLE_CUDA
    #define EXECSPACE std::conditional<std::is_same<TEST_EXECSPACE,Kokkos::Cuda>::value,Kokkos::CudaHostPinnedSpace,TEST_EXECSPACE>::type
  #else
    #ifdef KOKKOS_ENABLE_ROCM
      #define EXECSPACE std::conditional<std::is_same<TEST_EXECSPACE,Kokkos::Experimental::ROCm>::value,Kokkos::Experimental::ROCmHostPinnedSpace,TEST_EXECSPACE>::type
    #else
      #if defined(KOKKOS_ENABLE_OPENMPTARGET)
        #define EXECSPACE Kokkos::HostSpace
      #else
        #define EXECSPACE TEST_EXECSPACE
      #endif
    #endif
  #endif

  typedef Kokkos::View< double*[N1][N2][N3],
                        Kokkos::LayoutRight,
                        EXECSPACE > output_type;

  typedef Kokkos::View< int**[N2][N3],
                        Kokkos::LayoutLeft,
                        EXECSPACE > input_type;

  typedef Kokkos::View< int*[N0][N2][N3],
                        Kokkos::LayoutLeft,
                        EXECSPACE > diff_type;

  output_type output( "output", N0 );
  input_type  input ( "input", N0, N1 );
  diff_type   diff  ( "diff", N0 );

  Kokkos::fence();
  int value = 0;

  for ( size_t i3 = 0; i3 < N3; ++i3 )
  for ( size_t i2 = 0; i2 < N2; ++i2 )
  for ( size_t i1 = 0; i1 < N1; ++i1 )
  for ( size_t i0 = 0; i0 < N0; ++i0 )
  {
    input( i0, i1, i2, i3 ) = ++value;
  }

  Kokkos::fence();
  // Kokkos::deep_copy( diff, input ); // Throw with incompatible shape.
  Kokkos::deep_copy( output, input );
  Kokkos::fence();

  value = 0;

  for ( size_t i3 = 0; i3 < N3; ++i3 )
  for ( size_t i2 = 0; i2 < N2; ++i2 )
  for ( size_t i1 = 0; i1 < N1; ++i1 )
  for ( size_t i0 = 0; i0 < N0; ++i0 )
  {
    ++value;
    ASSERT_EQ( value, ( (int) output( i0, i1, i2, i3 ) ) );
  }
}

TEST_F( TEST_CATEGORY, view_mirror_nonconst )
{
  Kokkos::View<int*, TEST_EXECSPACE> d_view("d_view", 10);
  Kokkos::View<const int*, TEST_EXECSPACE> d_view_const = d_view;
  auto h_view = Kokkos::create_mirror(d_view_const);
  Kokkos::deep_copy(h_view, d_view_const);
  auto h_view2 = Kokkos::create_mirror(Kokkos::HostSpace(), d_view_const);
  Kokkos::deep_copy(h_view2, d_view_const);
}

template <typename DataType, typename ... Extents>
void test_left_stride(Extents ... extents) {
  using view_type = Kokkos::View<DataType, Kokkos::LayoutLeft, Kokkos::HostSpace>;
  view_type view("view", extents...);
  size_t expected_stride = 1;
  size_t all_strides[view_type::rank + 1];
  view.stride(all_strides);
  for (int i = 0; i < view_type::rank; ++i) {
    ASSERT_EQ(view.stride(i), expected_stride);
    ASSERT_EQ(all_strides[i], expected_stride);
    expected_stride *= view.extent(i);
  }
}

template <typename DataType, typename ... Extents>
void test_right_stride(Extents ... extents) {
  using view_type = Kokkos::View<DataType, Kokkos::LayoutRight, Kokkos::HostSpace>;
  view_type view("view", extents...);
  size_t expected_stride = 1;
  size_t all_strides[view_type::rank + 1];
  view.stride(all_strides);
  for (int ri = 0; ri < view_type::rank; ++ri) {
    auto i = view_type::rank - 1 - ri;
    ASSERT_EQ(view.stride(i), expected_stride);
    ASSERT_EQ(all_strides[i], expected_stride);
    expected_stride *= view.extent(i);
  }
}

template <typename DataType, typename ... Extents>
void test_stride(Extents ... extents) {
  test_right_stride<DataType>(extents...);
  test_left_stride<DataType>(extents...);
}

TEST_F( TEST_CATEGORY, view_stride_method )
{
  test_stride<double[3]>();
  test_stride<double*>(3);
  test_stride<double[3][7][13]>();
  test_stride<double***>(3, 7, 13);
  // factorial(8) = 40320
  test_stride<double[1][2][3][4][5][6][7][8]>();
  test_stride<double********>(1, 2, 3, 4, 5, 6, 7, 8);
}

inline void test_anonymous_space() {
  /* apparently TEST_EXECSPACE is sometimes a memory space. */
  using ExecSpace = TEST_EXECSPACE::execution_space;
  int host_array[10];
  Kokkos::View<int[10], Kokkos::AnonymousSpace> host_anon_stat_view(host_array);
  Kokkos::View<int*, Kokkos::AnonymousSpace> host_anon_dyn_view(host_array, 10);
  Kokkos::View<int*, Kokkos::HostSpace> host_view("host_view", 10);
  Kokkos::View<int*, Kokkos::AnonymousSpace> host_anon_assign_view = host_view;
  for (int i = 0; i < 10; ++i) {
    host_anon_stat_view(i) = host_anon_dyn_view(i) = 142;
    host_anon_assign_view(i) = 142;
  }
  Kokkos::View<int**, Kokkos::LayoutRight, ExecSpace> d_view("d_view", 100, 10);
#ifdef KOKKOS_ENABLE_CXX11_DISPATCH_LAMBDA
  Kokkos::parallel_for(Kokkos::RangePolicy<ExecSpace, int>(0, 100), KOKKOS_LAMBDA(int i) {
    int* ptr = &(d_view(i, 0));
    Kokkos::View<int[10], Kokkos::AnonymousSpace> d_anon_stat_view(ptr);
    Kokkos::View<int*, Kokkos::AnonymousSpace> d_anon_dyn_view(ptr, 10);
    auto sub = Kokkos::subview(d_view, i, Kokkos::ALL());
    Kokkos::View<int*, Kokkos::AnonymousSpace> d_anon_assign_view = sub;
    for (int j = 0; j < 10; ++j) {
      d_anon_stat_view(j) = 50;
      d_anon_assign_view(j) += 50;
      d_anon_dyn_view(j) += 42;
    }
  });
  Kokkos::fence();
#endif
}

TEST_F( TEST_CATEGORY, anonymous_space )
{
  test_anonymous_space();
}

template<class ExecSpace>
struct TestViewOverloadResolution {
  // Overload based on value_type and rank
  static int foo(Kokkos::View<const double**,ExecSpace> a) {
    return 1;
  }
  static int foo(Kokkos::View<const int**,ExecSpace> a) {
    return 2;
  }
  static int foo(Kokkos::View<const double***,ExecSpace> a) {
    return 3;
  }

  // Overload based on compile time dimensions
  static int bar(Kokkos::View<double*[3],ExecSpace> a) {
    return 4;
  }
  static int bar(Kokkos::View<double*[4],ExecSpace> a) {
    return 5;
  }

  static void test_function_overload() {
    Kokkos::View<double**, typename ExecSpace::execution_space::array_layout, ExecSpace> a("A",10,3);
    int data_type_1 = foo(a);
    int data_type_3 = foo(Kokkos::View<const double**, typename ExecSpace::execution_space::array_layout, ExecSpace>(a));
    Kokkos::View<double***, typename ExecSpace::execution_space::array_layout, ExecSpace> b("B",10,3,4);
    int data_type_2 = foo(b);
    Kokkos::View<double*[3], typename ExecSpace::execution_space::array_layout, ExecSpace> c(a);
    int static_extent = bar(c);
    ASSERT_EQ(1,data_type_1);
    ASSERT_EQ(3,data_type_2);
    ASSERT_EQ(1,data_type_3);
    ASSERT_EQ(4,static_extent);
  }
};

TEST_F( TEST_CATEGORY, view_overload_resolution )
{
  TestViewOverloadResolution<TEST_EXECSPACE>::test_function_overload();
}
}