/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *  Modifications Copyright© 2019-2025 Advanced Micro Devices, Inc. All rights reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#include <thrust/detail/nv_target.h>
#include <thrust/device_malloc_allocator.h>
#include <thrust/iterator/retag.h>
#include <thrust/uninitialized_copy.h>

#include "test_param_fixtures.hpp"
#include "test_real_assertions.hpp"
#include "test_utils.hpp"

TESTS_DEFINE(UninitializedCopyTests, FullTestsParams);

template <typename InputIterator, typename ForwardIterator>
ForwardIterator uninitialized_copy(my_system& system, InputIterator, InputIterator, ForwardIterator result)
{
  system.validate_dispatch();
  return result;
}

TEST(UninitializedCopyTests, TestUninitializedCopyDispatchExplicit)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  thrust::device_vector<int> vec(1);

  my_system sys(0);
  thrust::uninitialized_copy(sys, vec.begin(), vec.begin(), vec.begin());

  ASSERT_EQ(true, sys.is_valid());
}

template <typename InputIterator, typename ForwardIterator>
ForwardIterator uninitialized_copy(my_tag, InputIterator, InputIterator, ForwardIterator result)
{
  *result = 13;
  return result;
}

TEST(UninitializedCopyTests, TestUninitializedCopyDispatchImplicit)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  thrust::device_vector<int> vec(1);

  thrust::uninitialized_copy(
    thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.begin()));

  ASSERT_EQ(13, vec.front());
}

template <typename InputIterator, typename Size, typename ForwardIterator>
ForwardIterator uninitialized_copy_n(my_system& system, InputIterator, Size, ForwardIterator result)
{
  system.validate_dispatch();
  return result;
}

TEST(UninitializedCopyTests, TestUninitializedCopyNDispatchExplicit)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  thrust::device_vector<int> vec(1);

  my_system sys(0);
  thrust::uninitialized_copy_n(sys, vec.begin(), vec.size(), vec.begin());

  ASSERT_EQ(true, sys.is_valid());
}

template <typename InputIterator, typename Size, typename ForwardIterator>
ForwardIterator uninitialized_copy_n(my_tag, InputIterator, Size, ForwardIterator result)
{
  *result = 13;
  return result;
}

TEST(UninitializedCopyTests, TestUninitializedCopyNDispatchImplicit)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  thrust::device_vector<int> vec(1);

  thrust::uninitialized_copy_n(thrust::retag<my_tag>(vec.begin()), vec.size(), thrust::retag<my_tag>(vec.begin()));

  ASSERT_EQ(13, vec.front());
}

TYPED_TEST(UninitializedCopyTests, TestUninitializedCopySimplePOD)
{
  using Vector = typename TestFixture::input_type;

  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  Vector v1{0, 1, 2, 3, 4};

  // copy to Vector
  Vector v2(5);
  thrust::uninitialized_copy(v1.begin(), v1.end(), v2.begin());
  Vector ref{0, 1, 2, 3, 4};
  ASSERT_EQ(v2, ref);
}

TYPED_TEST(UninitializedCopyTests, TestUninitializedCopyNSimplePOD)
{
  using Vector = typename TestFixture::input_type;

  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  Vector v1{0, 1, 2, 3, 4};

  // copy to Vector
  Vector v2(5);
  thrust::uninitialized_copy_n(v1.begin(), v1.size(), v2.begin());
  Vector ref{0, 1, 2, 3, 4};
  ASSERT_EQ(v2, ref);
}

struct CopyConstructTest
{
  THRUST_HOST_DEVICE CopyConstructTest()
      : copy_constructed_on_host(false)
      , copy_constructed_on_device(false)
  {}

  THRUST_HOST_DEVICE CopyConstructTest(const CopyConstructTest&)
  {
    NV_IF_TARGET(NV_IS_DEVICE,
                 (copy_constructed_on_device = true; copy_constructed_on_host = false;),
                 (copy_constructed_on_device = false; copy_constructed_on_host = true;));
  }

  THRUST_HOST_DEVICE CopyConstructTest& operator=(const CopyConstructTest& x)
  {
    copy_constructed_on_host   = x.copy_constructed_on_host;
    copy_constructed_on_device = x.copy_constructed_on_device;
    return *this;
  }

  bool copy_constructed_on_host;
  bool copy_constructed_on_device;
};

/* TODO: Disabled test
 * The x = v1[0] call a host copy contructor and we need to
 * investigate why.
TEST(UninitializedCopyTests, TestUninitializedCopyNonPODDevice)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  using T = CopyConstructTest;

  thrust::device_vector<T> v1(5), v2(5);

  T x;
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  x = v1[0];
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  thrust::uninitialized_copy(v1.begin(), v1.end(), v2.begin());

  x = v2[0];
  ASSERT_EQ(true, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);
}
*/

/* TODO: Disabled test
 * The x = v1[0] call a host copy contructor and we need to
 * investigate why.
TEST(UninitializedCopyTests, TestUninitializedCopyNNonPODDevice)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  using T = CopyConstructTest;

  thrust::device_vector<T> v1(5), v2(5);

  T x;
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  x = v1[0];
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  thrust::uninitialized_copy_n(v1.begin(), v1.size(), v2.begin());

  x = v2[0];
  ASSERT_EQ(true, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);
}
*/

TEST(UninitializedCopyTests, TestUninitializedCopyNonPODHost)
{
  using T = CopyConstructTest;

  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  thrust::host_vector<T> v1(5), v2(5);

  T x;
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  x = v1[0];
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  thrust::uninitialized_copy(v1.begin(), v1.end(), v2.begin());

  x = v2[0];
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(true, x.copy_constructed_on_host);
}

TEST(UninitializedCopyTests, TestUninitializedCopyNNonPODHost)
{
  using T = CopyConstructTest;

  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  thrust::host_vector<T> v1(5), v2(5);

  T x;
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  x = v1[0];
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(false, x.copy_constructed_on_host);

  thrust::uninitialized_copy_n(v1.begin(), v1.size(), v2.begin());

  x = v2[0];
  ASSERT_EQ(false, x.copy_constructed_on_device);
  ASSERT_EQ(true, x.copy_constructed_on_host);
}

__global__ THRUST_HIP_LAUNCH_BOUNDS_DEFAULT void UninitializedCopyKernel(int const N, int* in_array, int* out_array)
{
  if (threadIdx.x == 0)
  {
    thrust::device_ptr<int> in_begin(in_array);
    thrust::device_ptr<int> in_end(in_array + N);
    thrust::device_ptr<int> out_begin(out_array);

    thrust::uninitialized_copy(thrust::hip::par, in_begin, in_end, out_begin);
  }
}

TEST(UninitializedCopyTests, TestUninitializedCopyDevice)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());
  for (auto size : get_sizes())
  {
    SCOPED_TRACE(testing::Message() << "with size= " << size);

    for (auto seed : get_seeds())
    {
      SCOPED_TRACE(testing::Message() << "with seed= " << seed);

      thrust::host_vector<int> h_data = get_random_data<int>(size, 0, size, seed);

      thrust::device_vector<int> d_data = h_data;
      thrust::device_vector<int> d_output(size);
      hipLaunchKernelGGL(
        UninitializedCopyKernel,
        dim3(1, 1, 1),
        dim3(128, 1, 1),
        0,
        0,
        size,
        thrust::raw_pointer_cast(&d_data[0]),
        thrust::raw_pointer_cast(&d_output[0]));
      HIP_CHECK(hipGetLastError());

      ASSERT_EQ(h_data, d_output);
    }
  }
}