/*
 *  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/iterator/zip_iterator.h>
#include <thrust/scan.h>

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

TESTS_DEFINE(ZipIteratorScanVariablesTests, NumericalTestsParams);

template <typename Tuple>
struct TuplePlus
{
  THRUST_HOST_DEVICE Tuple operator()(Tuple x, Tuple y) const
  {
    using namespace thrust;
    return make_tuple(get<0>(x) + get<0>(y), get<1>(x) + get<1>(y));
  }
}; // end SumTuple

TYPED_TEST(ZipIteratorScanVariablesTests, TestZipIteratorScan)
{
  using T = typename TestFixture::input_type;
  using namespace thrust;

  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);

      host_vector<T> h_data0 =
        get_random_data<T>(size, get_default_limits<T>::min(), get_default_limits<T>::max(), seed);
      host_vector<T> h_data1 = get_random_data<T>(
        size, get_default_limits<T>::min(), get_default_limits<T>::max(), seed + seed_value_addition);

      device_vector<T> d_data0 = h_data0;
      device_vector<T> d_data1 = h_data1;

      using Tuple = tuple<T, T>;

      host_vector<Tuple> h_result(size);
      device_vector<Tuple> d_result(size);

      // inclusive_scan (tuple output)
      thrust::inclusive_scan(
        make_zip_iterator(h_data0.begin(), h_data1.begin()),
        make_zip_iterator(h_data0.end(), h_data1.end()),
        h_result.begin(),
        TuplePlus<Tuple>());
      thrust::inclusive_scan(
        make_zip_iterator(d_data0.begin(), d_data1.begin()),
        make_zip_iterator(d_data0.end(), d_data1.end()),
        d_result.begin(),
        TuplePlus<Tuple>());
      host_vector<Tuple> h_result_d(d_result);
      for (size_t i = 0; i < h_result.size(); ++i)
      {
        test_equality(thrust::get<0>(h_result[i]), thrust::get<0>(h_result_d[i]), i);
        test_equality(thrust::get<1>(h_result[i]), thrust::get<1>(h_result_d[i]), i);
      }

      // exclusive_scan (tuple output)
      thrust::exclusive_scan(
        make_zip_iterator(h_data0.begin(), h_data1.begin()),
        make_zip_iterator(h_data0.end(), h_data1.end()),
        h_result.begin(),
        make_tuple<T, T>(0, 0),
        TuplePlus<Tuple>());
      thrust::exclusive_scan(
        make_zip_iterator(d_data0.begin(), d_data1.begin()),
        make_zip_iterator(d_data0.end(), d_data1.end()),
        d_result.begin(),
        make_tuple<T, T>(0, 0),
        TuplePlus<Tuple>());
      h_result_d = d_result;
      for (size_t i = 0; i < h_result.size(); ++i)
      {
        test_equality(thrust::get<0>(h_result[i]), thrust::get<0>(h_result_d[i]), i);
        test_equality(thrust::get<1>(h_result[i]), thrust::get<1>(h_result_d[i]), i);
      }

      host_vector<T> h_result0(size);
      host_vector<T> h_result1(size);
      device_vector<T> d_result0(size);
      device_vector<T> d_result1(size);

      // inclusive_scan (zip_iterator output)
      thrust::inclusive_scan(
        make_zip_iterator(h_data0.begin(), h_data1.begin()),
        make_zip_iterator(h_data0.end(), h_data1.end()),
        make_zip_iterator(h_result0.begin(), h_result1.begin()),
        TuplePlus<Tuple>());
      thrust::inclusive_scan(
        make_zip_iterator(d_data0.begin(), d_data1.begin()),
        make_zip_iterator(d_data0.end(), d_data1.end()),
        make_zip_iterator(d_result0.begin(), d_result1.begin()),
        TuplePlus<Tuple>());
      test_equality_scan(h_result0, d_result0);
      test_equality_scan(h_result1, d_result1);

      // exclusive_scan (zip_iterator output)
      thrust::exclusive_scan(
        make_zip_iterator(h_data0.begin(), h_data1.begin()),
        make_zip_iterator(h_data0.end(), h_data1.end()),
        make_zip_iterator(h_result0.begin(), h_result1.begin()),
        make_tuple<T, T>(0, 0),
        TuplePlus<Tuple>());
      thrust::exclusive_scan(
        make_zip_iterator(d_data0.begin(), d_data1.begin()),
        make_zip_iterator(d_data0.end(), d_data1.end()),
        make_zip_iterator(d_result0.begin(), d_result1.begin()),
        make_tuple<T, T>(0, 0),
        TuplePlus<Tuple>());
      test_equality_scan(h_result0, d_result0);
      test_equality_scan(h_result1, d_result1);
    }
  }
}