/*
 *  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/sort.h>
#include <thrust/transform.h>
#include <thrust/tuple.h>

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

TESTS_DEFINE(TupleSortTests, IntegerTestsParams);

struct MakeTupleFunctor
{
  template <typename T1, typename T2>
  __host__ __device__ thrust::tuple<T1, T2> operator()(T1& lhs, T2& rhs)
  {
    return thrust::make_tuple(lhs, rhs);
  }
};

template <int N>
struct GetFunctor
{
  template <typename Tuple>
  __host__ __device__ typename thrust::access_traits<typename thrust::tuple_element<N, Tuple>::type>::const_type
  operator()(const Tuple& t)
  {
    return thrust::get<N>(t);
  }
};

TYPED_TEST(TupleSortTests, TestTupleStableSort)
{
  using T = typename TestFixture::input_type;

  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<T> h_keys =
        get_random_data<T>(size, get_default_limits<T>::min(), get_default_limits<T>::max(), seed);

      thrust::host_vector<T> h_values = get_random_data<T>(
        size, get_default_limits<T>::min(), get_default_limits<T>::max(), seed + seed_value_addition);

      thrust::host_vector<thrust::tuple<T, T>> h_tuples(size);
      transform(h_keys.begin(), h_keys.end(), h_values.begin(), h_tuples.begin(), MakeTupleFunctor());

      // copy to device
      thrust::device_vector<thrust::tuple<T, T>> d_tuples = h_tuples;

      // sort on host
      thrust::stable_sort(h_tuples.begin(), h_tuples.end());

      // sort on device
      thrust::stable_sort(d_tuples.begin(), d_tuples.end());

      ASSERT_EQ(true, is_sorted(d_tuples.begin(), d_tuples.end()));

      // select keys
      thrust::transform(h_tuples.begin(), h_tuples.end(), h_keys.begin(), GetFunctor<0>());

      thrust::device_vector<T> d_keys(h_keys.size());
      thrust::transform(d_tuples.begin(), d_tuples.end(), d_keys.begin(), GetFunctor<0>());

      // select values
      thrust::transform(h_tuples.begin(), h_tuples.end(), h_values.begin(), GetFunctor<1>());

      thrust::device_vector<T> d_values(h_values.size());
      thrust::transform(d_tuples.begin(), d_tuples.end(), d_values.begin(), GetFunctor<1>());

      ASSERT_EQ(h_keys, d_keys);
      ASSERT_EQ(h_values, d_values);
    }
  }
}
