// Note: Luc Berger-Vergiat 04/14/21
//       This tests uses KOKKOS_LAMBDA so we need
//       to make sure that these are enabled in
//       the CUDA backend before including this test.
#if !defined(TEST_CUDA_BLAS_CPP) || defined(KOKKOS_ENABLE_CUDA_LAMBDA)

#include <gtest/gtest.h>
#include <Kokkos_Core.hpp>
#include <Kokkos_Random.hpp>
#include <KokkosBlas1_team_axpby.hpp>
#include <KokkosBlas1_dot.hpp>
#include <KokkosKernels_TestUtils.hpp>

namespace Test {
template <class ViewTypeA, class ViewTypeB, class Device>
void impl_test_team_axpby(int N) {
  typedef Kokkos::TeamPolicy<Device> team_policy;
  typedef typename team_policy::member_type team_member;

  // Launch M teams of the maximum number of threads per team
  int M = 4;
  const team_policy policy(M, Kokkos::AUTO);
  const int team_data_siz = (N % M == 0) ? (N / M) : (N / M + 1);

  typedef typename ViewTypeA::value_type ScalarA;
  typedef typename ViewTypeB::value_type ScalarB;

  typedef Kokkos::View<
      ScalarA * [2],
      typename std::conditional<std::is_same<typename ViewTypeA::array_layout,
                                             Kokkos::LayoutStride>::value,
                                Kokkos::LayoutRight, Kokkos::LayoutLeft>::type,
      Device>
      BaseTypeA;
  typedef Kokkos::View<
      ScalarB * [2],
      typename std::conditional<std::is_same<typename ViewTypeB::array_layout,
                                             Kokkos::LayoutStride>::value,
                                Kokkos::LayoutRight, Kokkos::LayoutLeft>::type,
      Device>
      BaseTypeB;

  ScalarA a  = 3;
  ScalarB b  = 5;
  double eps = std::is_same<ScalarA, float>::value ? 2 * 1e-5 : 1e-7;

  BaseTypeA b_x("X", N);
  BaseTypeB b_y("Y", N);
  BaseTypeB b_org_y("Org_Y", N);

  ViewTypeA x                        = Kokkos::subview(b_x, Kokkos::ALL(), 0);
  ViewTypeB y                        = Kokkos::subview(b_y, Kokkos::ALL(), 0);
  typename ViewTypeA::const_type c_x = x;
  typename ViewTypeB::const_type c_y = y;

  typename BaseTypeA::HostMirror h_b_x = Kokkos::create_mirror_view(b_x);
  typename BaseTypeB::HostMirror h_b_y = Kokkos::create_mirror_view(b_y);

  typename ViewTypeA::HostMirror h_x = Kokkos::subview(h_b_x, Kokkos::ALL(), 0);
  typename ViewTypeB::HostMirror h_y = Kokkos::subview(h_b_y, Kokkos::ALL(), 0);

  Kokkos::Random_XorShift64_Pool<typename Device::execution_space> rand_pool(
      13718);

  Kokkos::fill_random(b_x, rand_pool, ScalarA(10));
  Kokkos::fill_random(b_y, rand_pool, ScalarB(10));

  Kokkos::deep_copy(b_org_y, b_y);

  Kokkos::deep_copy(h_b_x, b_x);
  Kokkos::deep_copy(h_b_y, b_y);

  ScalarA expected_result = 0;
  for (int i = 0; i < N; i++)
    expected_result +=
        ScalarB(a * h_x(i) + b * h_y(i)) * ScalarB(a * h_x(i) + b * h_y(i));

  // KokkosBlas::axpby(a,x,b,y);
  Kokkos::parallel_for(
      "KokkosBlas::Test::TeamAxpby", policy,
      KOKKOS_LAMBDA(const team_member &teamMember) {
        const int teamId = teamMember.league_rank();
        KokkosBlas::Experimental::axpby(
            teamMember, a,
            Kokkos::subview(
                x, Kokkos::make_pair(
                       teamId * team_data_siz,
                       (teamId < M - 1) ? (teamId + 1) * team_data_siz : N)),
            b,
            Kokkos::subview(
                y, Kokkos::make_pair(
                       teamId * team_data_siz,
                       (teamId < M - 1) ? (teamId + 1) * team_data_siz : N)));
      });

  ScalarB nonconst_nonconst_result = KokkosBlas::dot(y, y);
  EXPECT_NEAR_KK(nonconst_nonconst_result, expected_result,
                 eps * expected_result);

  Kokkos::deep_copy(b_y, b_org_y);

  // KokkosBlas::axpby(a,c_x,b,y);
  Kokkos::parallel_for(
      "KokkosBlas::Test::TeamAxpby", policy,
      KOKKOS_LAMBDA(const team_member &teamMember) {
        const int teamId = teamMember.league_rank();
        KokkosBlas::Experimental::axpby(
            teamMember, a,
            Kokkos::subview(
                c_x, Kokkos::make_pair(
                         teamId * team_data_siz,
                         (teamId < M - 1) ? (teamId + 1) * team_data_siz : N)),
            b,
            Kokkos::subview(
                y, Kokkos::make_pair(
                       teamId * team_data_siz,
                       (teamId < M - 1) ? (teamId + 1) * team_data_siz : N)));
      });

  ScalarB const_nonconst_result = KokkosBlas::dot(c_y, c_y);
  EXPECT_NEAR_KK(const_nonconst_result, expected_result, eps * expected_result);
}

template <class ViewTypeA, class ViewTypeB, class Device>
void impl_test_team_axpby_mv(int N, int K) {
  typedef Kokkos::TeamPolicy<Device> team_policy;
  typedef typename team_policy::member_type team_member;

  // Launch K teams of the maximum number of threads per team
  const team_policy policy(K, Kokkos::AUTO);

  typedef typename ViewTypeA::value_type ScalarA;
  typedef typename ViewTypeB::value_type ScalarB;

  typedef multivector_layout_adapter<ViewTypeA> vfA_type;
  typedef multivector_layout_adapter<ViewTypeB> vfB_type;

  typename vfA_type::BaseType b_x("A", N, K);
  typename vfB_type::BaseType b_y("B", N, K);
  typename vfB_type::BaseType b_org_y("B", N, K);

  ViewTypeA x = vfA_type::view(b_x);
  ViewTypeB y = vfB_type::view(b_y);

  typedef multivector_layout_adapter<typename ViewTypeA::HostMirror> h_vfA_type;
  typedef multivector_layout_adapter<typename ViewTypeB::HostMirror> h_vfB_type;

  typename h_vfA_type::BaseType h_b_x = Kokkos::create_mirror_view(b_x);
  typename h_vfB_type::BaseType h_b_y = Kokkos::create_mirror_view(b_y);

  typename ViewTypeA::HostMirror h_x = h_vfA_type::view(h_b_x);
  typename ViewTypeB::HostMirror h_y = h_vfB_type::view(h_b_y);

  Kokkos::Random_XorShift64_Pool<typename Device::execution_space> rand_pool(
      13718);

  Kokkos::fill_random(b_x, rand_pool, ScalarA(10));
  Kokkos::fill_random(b_y, rand_pool, ScalarB(10));

  Kokkos::deep_copy(b_org_y, b_y);

  Kokkos::deep_copy(h_b_x, b_x);
  Kokkos::deep_copy(h_b_y, b_y);

  ScalarA a                          = 3;
  ScalarB b                          = 5;
  typename ViewTypeA::const_type c_x = x;

  ScalarA *expected_result = new ScalarA[K];
  for (int j = 0; j < K; j++) {
    expected_result[j] = ScalarA();
    for (int i = 0; i < N; i++)
      expected_result[j] += ScalarB(a * h_x(i, j) + b * h_y(i, j)) *
                            ScalarB(a * h_x(i, j) + b * h_y(i, j));
  }

  double eps = std::is_same<ScalarA, float>::value ? 2 * 1e-5 : 1e-7;

  Kokkos::View<ScalarB *, Kokkos::HostSpace> r("Dot::Result", K);

  typedef Kokkos::Details::ArithTraits<ScalarA> AT;

  // KokkosBlas::axpby(a,x,b,y);
  Kokkos::parallel_for(
      "KokkosBlas::Test::TeamAxpby", policy,
      KOKKOS_LAMBDA(const team_member &teamMember) {
        const int teamId = teamMember.league_rank();
        KokkosBlas::Experimental::axpby(
            teamMember, a, Kokkos::subview(x, Kokkos::ALL(), teamId), b,
            Kokkos::subview(y, Kokkos::ALL(), teamId));
      });

  KokkosBlas::dot(r, y, y);
  for (int k = 0; k < K; k++) {
    ScalarA nonconst_nonconst_result = r(k);
    EXPECT_NEAR_KK(AT::abs(nonconst_nonconst_result),
                   AT::abs(expected_result[k]),
                   AT::abs(expected_result[k] * eps));
  }

  Kokkos::deep_copy(b_y, b_org_y);

  // KokkosBlas::axpby(a,c_x,b,y);
  Kokkos::parallel_for(
      "KokkosBlas::Test::TeamAxpby", policy,
      KOKKOS_LAMBDA(const team_member &teamMember) {
        const int teamId = teamMember.league_rank();
        KokkosBlas::Experimental::axpby(
            teamMember, a, Kokkos::subview(c_x, Kokkos::ALL(), teamId), b,
            Kokkos::subview(y, Kokkos::ALL(), teamId));
      });

  KokkosBlas::dot(r, y, y);
  for (int k = 0; k < K; k++) {
    ScalarA const_non_const_result = r(k);
    EXPECT_NEAR_KK(AT::abs(const_non_const_result), AT::abs(expected_result[k]),
                   AT::abs(eps * expected_result[k]));
  }

  delete[] expected_result;
}
}  // namespace Test

template <class ScalarA, class ScalarB, class Device>
int test_team_axpby() {
#if defined(KOKKOSKERNELS_INST_LAYOUTLEFT) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&      \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
  typedef Kokkos::View<ScalarA *, Kokkos::LayoutLeft, Device> view_type_a_ll;
  typedef Kokkos::View<ScalarB *, Kokkos::LayoutLeft, Device> view_type_b_ll;
  Test::impl_test_team_axpby<view_type_a_ll, view_type_b_ll, Device>(0);
  Test::impl_test_team_axpby<view_type_a_ll, view_type_b_ll, Device>(13);
  Test::impl_test_team_axpby<view_type_a_ll, view_type_b_ll, Device>(124);
  // Test::impl_test_team_axpby<view_type_a_ll, view_type_b_ll, Device>(132231);
#endif

#if defined(KOKKOSKERNELS_INST_LAYOUTRIGHT) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&       \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
  typedef Kokkos::View<ScalarA *, Kokkos::LayoutRight, Device> view_type_a_lr;
  typedef Kokkos::View<ScalarB *, Kokkos::LayoutRight, Device> view_type_b_lr;
  Test::impl_test_team_axpby<view_type_a_lr, view_type_b_lr, Device>(0);
  Test::impl_test_team_axpby<view_type_a_lr, view_type_b_lr, Device>(13);
  Test::impl_test_team_axpby<view_type_a_lr, view_type_b_lr, Device>(124);
  // Test::impl_test_team_axpby<view_type_a_lr, view_type_b_lr, Device>(132231);
#endif

#if defined(KOKKOSKERNELS_INST_LAYOUTSTRIDE) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&        \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
  typedef Kokkos::View<ScalarA *, Kokkos::LayoutStride, Device> view_type_a_ls;
  typedef Kokkos::View<ScalarB *, Kokkos::LayoutStride, Device> view_type_b_ls;
  Test::impl_test_team_axpby<view_type_a_ls, view_type_b_ls, Device>(0);
  Test::impl_test_team_axpby<view_type_a_ls, view_type_b_ls, Device>(13);
  Test::impl_test_team_axpby<view_type_a_ls, view_type_b_ls, Device>(124);
  // Test::impl_test_team_axpby<view_type_a_ls, view_type_b_ls, Device>(132231);
#endif

#if !defined(KOKKOSKERNELS_ETI_ONLY) && \
    !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS)
  Test::impl_test_team_axpby<view_type_a_ls, view_type_b_ll, Device>(124);
  Test::impl_test_team_axpby<view_type_a_ll, view_type_b_ls, Device>(124);
#endif

  return 1;
}

template <class ScalarA, class ScalarB, class Device>
int test_team_axpby_mv() {
#if defined(KOKKOSKERNELS_INST_LAYOUTLEFT) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&      \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
  typedef Kokkos::View<ScalarA **, Kokkos::LayoutLeft, Device> view_type_a_ll;
  typedef Kokkos::View<ScalarB **, Kokkos::LayoutLeft, Device> view_type_b_ll;
  Test::impl_test_team_axpby_mv<view_type_a_ll, view_type_b_ll, Device>(0, 5);
  Test::impl_test_team_axpby_mv<view_type_a_ll, view_type_b_ll, Device>(13, 5);
  Test::impl_test_team_axpby_mv<view_type_a_ll, view_type_b_ll, Device>(124, 5);
  // Test::impl_test_team_axpby_mv<view_type_a_ll, view_type_b_ll,
  // Device>(132231,5);
#endif

#if defined(KOKKOSKERNELS_INST_LAYOUTRIGHT) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&       \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
  typedef Kokkos::View<ScalarA **, Kokkos::LayoutRight, Device> view_type_a_lr;
  typedef Kokkos::View<ScalarB **, Kokkos::LayoutRight, Device> view_type_b_lr;
  Test::impl_test_team_axpby_mv<view_type_a_lr, view_type_b_lr, Device>(0, 5);
  Test::impl_test_team_axpby_mv<view_type_a_lr, view_type_b_lr, Device>(13, 5);
  Test::impl_test_team_axpby_mv<view_type_a_lr, view_type_b_lr, Device>(124, 5);
  // Test::impl_test_team_axpby_mv<view_type_a_lr, view_type_b_lr,
  // Device>(132231,5);
#endif

#if defined(KOKKOSKERNELS_INST_LAYOUTSTRIDE) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&        \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
  typedef Kokkos::View<ScalarA **, Kokkos::LayoutStride, Device> view_type_a_ls;
  typedef Kokkos::View<ScalarB **, Kokkos::LayoutStride, Device> view_type_b_ls;
  Test::impl_test_team_axpby_mv<view_type_a_ls, view_type_b_ls, Device>(0, 5);
  Test::impl_test_team_axpby_mv<view_type_a_ls, view_type_b_ls, Device>(13, 5);
  Test::impl_test_team_axpby_mv<view_type_a_ls, view_type_b_ls, Device>(124, 5);
  // Test::impl_test_team_axpby_mv<view_type_a_ls, view_type_b_ls,
  // Device>(132231,5);
#endif

#if !defined(KOKKOSKERNELS_ETI_ONLY) && \
    !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS)
  Test::impl_test_team_axpby_mv<view_type_a_ls, view_type_b_ll, Device>(124, 5);
  Test::impl_test_team_axpby_mv<view_type_a_ll, view_type_b_ls, Device>(124, 5);
#endif

  return 1;
}

#if defined(KOKKOSKERNELS_INST_FLOAT) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) && \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F(TestCategory, team_axpby_float) {
  test_team_axpby<float, float, TestExecSpace>();
}
TEST_F(TestCategory, team_axpby_mv_float) {
  test_team_axpby_mv<float, float, TestExecSpace>();
}
#endif

#if defined(KOKKOSKERNELS_INST_DOUBLE) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&  \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F(TestCategory, team_axpby_double) {
  test_team_axpby<double, double, TestExecSpace>();
}
TEST_F(TestCategory, team_axpby_mv_double) {
  test_team_axpby_mv<double, double, TestExecSpace>();
}
#endif

#if defined(KOKKOSKERNELS_INST_COMPLEX_DOUBLE) || \
    (!defined(KOKKOSKERNELS_ETI_ONLY) &&          \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F(TestCategory, team_axpby_complex_double) {
  test_team_axpby<Kokkos::complex<double>, Kokkos::complex<double>,
                  TestExecSpace>();
}
TEST_F(TestCategory, team_axpby_mv_complex_double) {
  test_team_axpby_mv<Kokkos::complex<double>, Kokkos::complex<double>,
                     TestExecSpace>();
}
#endif

#if defined(KOKKOSKERNELS_INST_INT) ||   \
    (!defined(KOKKOSKERNELS_ETI_ONLY) && \
     !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F(TestCategory, team_axpby_int) {
  test_team_axpby<int, int, TestExecSpace>();
}
TEST_F(TestCategory, team_axpby_mv_int) {
  test_team_axpby_mv<int, int, TestExecSpace>();
}
#endif

#if !defined(KOKKOSKERNELS_ETI_ONLY) && \
    !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS)
TEST_F(TestCategory, team_axpby_double_int) {
  test_team_axpby<double, int, TestExecSpace>();
}
TEST_F(TestCategory, team_axpby_double_mv_int) {
  test_team_axpby_mv<double, int, TestExecSpace>();
}
#endif

#endif  // check for lambda availability in CUDA backend
