/*
 *  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_fill.h>

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

TESTS_DEFINE(UninitializedFillTests, FullTestsParams);

template <typename ForwardIterator, typename T>
void uninitialized_fill(my_system& system, ForwardIterator, ForwardIterator, const T&)
{
  system.validate_dispatch();
}

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

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

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

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

template <typename ForwardIterator, typename T>
void uninitialized_fill(my_tag, ForwardIterator first, ForwardIterator, const T&)
{
  *first = 13;
}

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

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

  thrust::uninitialized_fill(thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.begin()), 0);

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

template <typename ForwardIterator, typename Size, typename T>
ForwardIterator uninitialized_fill_n(my_system& system, ForwardIterator first, Size, const T&)
{
  system.validate_dispatch();
  return first;
}

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

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

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

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

template <typename ForwardIterator, typename Size, typename T>
ForwardIterator uninitialized_fill_n(my_tag, ForwardIterator first, Size, const T&)
{
  *first = 13;
  return first;
}

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

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

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

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

TYPED_TEST(UninitializedFillTests, TestUninitializedFillPOD)
{
  using Vector = typename TestFixture::input_type;
  using T      = typename Vector::value_type;

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

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

  T exemplar(7);

  thrust::uninitialized_fill(v.begin() + 1, v.begin() + 4, exemplar);

  Vector ref{0, exemplar, exemplar, exemplar, 4};
  ASSERT_EQ(v, ref);

  exemplar = 8;

  thrust::uninitialized_fill(v.begin() + 0, v.begin() + 3, exemplar);

  ref = {exemplar, exemplar, exemplar, 7, 4};
  ASSERT_EQ(v, ref);

  exemplar = 9;

  thrust::uninitialized_fill(v.begin() + 2, v.end(), exemplar);

  ref = {8, 8, exemplar, exemplar, 9};
  ASSERT_EQ(v, ref);

  exemplar = 1;

  thrust::uninitialized_fill(v.begin(), v.end(), exemplar);

  ref = {exemplar, exemplar, exemplar, exemplar, exemplar};
  ASSERT_EQ(v, 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(UninitializedFillTests, TestUninitializedFillNonPOD)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  using T                 = CopyConstructTest;
  thrust::device_ptr<T> v = thrust::device_malloc<T>(5);

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

  T host_copy_of_exemplar(exemplar);
  ASSERT_EQ(false, exemplar.copy_constructed_on_device);
  ASSERT_EQ(true, exemplar.copy_constructed_on_host);

  // copy construct v from the exemplar
  thrust::uninitialized_fill(v, v + 1, exemplar);

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

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

  thrust::device_free(v);
}
*/

TYPED_TEST(UninitializedFillTests, TestUninitializedFillNPOD)
{
  using Vector = typename TestFixture::input_type;
  using T      = typename Vector::value_type;

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

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

  T exemplar(7);

  typename Vector::iterator iter = thrust::uninitialized_fill_n(v.begin() + 1, 3, exemplar);

  Vector ref{0, exemplar, exemplar, exemplar, 4};
  ASSERT_EQ_QUIET(v.begin() + 4, iter);

  exemplar = 8;

  iter = thrust::uninitialized_fill_n(v.begin() + 0, 3, exemplar);

  ref = {exemplar, exemplar, exemplar, 7, 4};
  ASSERT_EQ_QUIET(v.begin() + 3, iter);

  exemplar = 9;

  iter = thrust::uninitialized_fill_n(v.begin() + 2, 3, exemplar);

  ref = {8, 8, exemplar, exemplar, 9};
  ASSERT_EQ_QUIET(v.end(), iter);

  exemplar = 1;

  iter = thrust::uninitialized_fill_n(v.begin(), v.size(), exemplar);

  ref = {exemplar, exemplar, exemplar, exemplar, exemplar};
  ASSERT_EQ_QUIET(v.end(), iter);
}

/* TODO: Disabled test
 * The x = v1[0] call a host copy contructor and we need to
 * investigate why.
TEST(UninitializedFillTests, TestUninitializedFillNNonPOD)
{
  using T                 = CopyConstructTest;
  thrust::device_ptr<T> v = thrust::device_malloc<T>(5);

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

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

  T host_copy_of_exemplar(exemplar);
  ASSERT_EQ(false, exemplar.copy_constructed_on_device);
  ASSERT_EQ(true, exemplar.copy_constructed_on_host);

  // copy construct v from the exemplar
  thrust::uninitialized_fill_n(v, 1, exemplar);

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

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

  thrust::device_free(v);
}
*/

__global__ THRUST_HIP_LAUNCH_BOUNDS_DEFAULT void UninitializedFillKernel(int const N, int* array, int fill_value)
{
  if (threadIdx.x == 0)
  {
    thrust::device_ptr<int> begin(array);
    thrust::device_ptr<int> end(array + N);
    thrust::uninitialized_fill(thrust::hip::par, begin, end, fill_value);
  }
}

TEST(UninitializedFillTests, TestUninitializedFillDevice)
{
  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;

      int fill_value = get_random_data<int>(1, 0, size, seed)[0];
      SCOPED_TRACE(testing::Message() << "with fill_value= " << fill_value);

      thrust::uninitialized_fill(h_data.begin(), h_data.end(), fill_value);
      hipLaunchKernelGGL(
        UninitializedFillKernel,
        dim3(1, 1, 1),
        dim3(128, 1, 1),
        0,
        0,
        size,
        thrust::raw_pointer_cast(&d_data[0]),
        fill_value);
      HIP_CHECK(hipGetLastError());

      ASSERT_EQ(h_data, d_data);
    }
  }
}