#include<gtest/gtest.h>
#include<Kokkos_Core.hpp>
#include<Kokkos_Random.hpp>
#include<KokkosBlas1_axpby.hpp>
#include<KokkosBlas1_dot.hpp>
#include<KokkosKernels_TestUtils.hpp>

namespace Test {
  template<class ViewTypeA, class ViewTypeB, class Device>
  void impl_test_axpy(int N) {

    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;
    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) + h_y(i)) * ScalarB(a*h_x(i) + h_y(i));

    KokkosBlas::axpy(a,x,y);
    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::axpy(a,c_x,y);
    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_axpy_mv(int N, int K) {

    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;
    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) + h_y(i,j)) * ScalarB(a*h_x(i,j) + 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);

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

    Kokkos::deep_copy(b_y,b_org_y);
    KokkosBlas::axpy(a,c_x,y);
    KokkosBlas::dot(r,y,y);
    for(int k=0;k<K;k++) {
      ScalarA const_non_const_result = r(k);
      EXPECT_NEAR_KK( const_non_const_result, expected_result[k], eps*expected_result[k]);
    }

    delete [] expected_result;
  }
}



template<class ScalarA, class ScalarB, class Device>
int test_axpy() {

#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_axpy<view_type_a_ll, view_type_b_ll, Device>(0);
  Test::impl_test_axpy<view_type_a_ll, view_type_b_ll, Device>(13);
  Test::impl_test_axpy<view_type_a_ll, view_type_b_ll, Device>(1024);
  Test::impl_test_axpy<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_axpy<view_type_a_lr, view_type_b_lr, Device>(0);
  Test::impl_test_axpy<view_type_a_lr, view_type_b_lr, Device>(13);
  Test::impl_test_axpy<view_type_a_lr, view_type_b_lr, Device>(1024);
  Test::impl_test_axpy<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_axpy<view_type_a_ls, view_type_b_ls, Device>(0);
  Test::impl_test_axpy<view_type_a_ls, view_type_b_ls, Device>(13);
  Test::impl_test_axpy<view_type_a_ls, view_type_b_ls, Device>(1024);
  Test::impl_test_axpy<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_axpy<view_type_a_ls, view_type_b_ll, Device>(1024);
  Test::impl_test_axpy<view_type_a_ll, view_type_b_ls, Device>(1024);
#endif

  return 1;
}

template<class ScalarA, class ScalarB, class Device>
int test_axpy_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_axpy_mv<view_type_a_ll, view_type_b_ll, Device>(0,5);
  Test::impl_test_axpy_mv<view_type_a_ll, view_type_b_ll, Device>(13,5);
  Test::impl_test_axpy_mv<view_type_a_ll, view_type_b_ll, Device>(1024,5);
  Test::impl_test_axpy_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_axpy_mv<view_type_a_lr, view_type_b_lr, Device>(0,5);
  Test::impl_test_axpy_mv<view_type_a_lr, view_type_b_lr, Device>(13,5);
  Test::impl_test_axpy_mv<view_type_a_lr, view_type_b_lr, Device>(1024,5);
  Test::impl_test_axpy_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_axpy_mv<view_type_a_ls, view_type_b_ls, Device>(0,5);
  Test::impl_test_axpy_mv<view_type_a_ls, view_type_b_ls, Device>(13,5);
  Test::impl_test_axpy_mv<view_type_a_ls, view_type_b_ls, Device>(1024,5);
  Test::impl_test_axpy_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_axpy_mv<view_type_a_ls, view_type_b_ll, Device>(1024,5);
  Test::impl_test_axpy_mv<view_type_a_ll, view_type_b_ls, Device>(1024,5);
#endif

  return 1;
}

#if defined(KOKKOSKERNELS_INST_FLOAT) || (!defined(KOKKOSKERNELS_ETI_ONLY) && !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F( TestCategory, axpy_float ) {
    test_axpy<float,float,TestExecSpace> ();
}
TEST_F( TestCategory, axpy_mv_float ) {
    test_axpy_mv<float,float,TestExecSpace> ();
}
#endif

#if defined(KOKKOSKERNELS_INST_DOUBLE) || (!defined(KOKKOSKERNELS_ETI_ONLY) && !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F( TestCategory, axpy_double ) {
    test_axpy<double,double,TestExecSpace> ();
}
TEST_F( TestCategory, axpy_mv_double ) {
    test_axpy_mv<double,double,TestExecSpace> ();
}
#endif

#if defined(KOKKOSKERNELS_INST_COMPLEX_DOUBLE) || (!defined(KOKKOSKERNELS_ETI_ONLY) && !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS))
TEST_F( TestCategory, axpy_complex_double ) {
    test_axpy<Kokkos::complex<double>,Kokkos::complex<double>,TestExecSpace> ();
}
TEST_F( TestCategory, axpy_mv_complex_double ) {
    test_axpy_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, axpy_int ) {
    test_axpy<int,int,TestExecSpace> ();
}
TEST_F( TestCategory, axpy_mv_int ) {
    test_axpy_mv<int,int,TestExecSpace> ();
}
#endif

#if !defined(KOKKOSKERNELS_ETI_ONLY) && !defined(KOKKOSKERNELS_IMPL_CHECK_ETI_CALLS)
TEST_F( TestCategory, axpy_double_int ) {
    test_axpy<double,int,TestExecSpace> ();
}
TEST_F( TestCategory, axpy_double_mv_int ) {
    test_axpy_mv<double,int,TestExecSpace> ();
}
#endif
