/*
 *  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/device_vector.h>
#include <thrust/inner_product.h>
#include <thrust/iterator/retag.h>

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

TESTS_DEFINE(InnerProductTests, FullTestsParams);
TESTS_DEFINE(PrimitiveInnerProductTests, NumericalTestsParams);

template <class T>
T clip_infinity(T val)
{
  T min = std::numeric_limits<T>::min();
  T max = std::numeric_limits<T>::max();
  if (val > max)
  {
    return max;
  }
  if (val < min)
  {
    return min;
  }
  return val;
}

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

  ASSERT_EQ(THRUST_DEVICE_SYSTEM, THRUST_DEVICE_SYSTEM_HIP);
}

TYPED_TEST(InnerProductTests, InnerProductSimple)
{
  using Vector = typename TestFixture::input_type;
  using Policy = typename TestFixture::execution_policy;
  using T      = typename Vector::value_type;

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

  Vector v1(3);
  Vector v2(3);
  v1[0] = 1;
  v1[1] = -2;
  v1[2] = 3;
  v2[0] = -4;
  v2[1] = 5;
  v2[2] = 6;

  T init   = 3;
  T result = thrust::inner_product(Policy{}, v1.begin(), v1.end(), v2.begin(), init);

  ASSERT_NEAR(result, (T) 7, (T) 0.01);
}

template <typename InputIterator1, typename InputIterator2, typename OutputType>
int inner_product(my_system& system, InputIterator1, InputIterator1, InputIterator2, OutputType)
{
  system.validate_dispatch();
  return 13;
}

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

  thrust::device_vector<int> vec;

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

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

template <typename InputIterator1, typename InputIterator2, typename OutputType>
int inner_product(my_tag, InputIterator1, InputIterator1, InputIterator2, OutputType)
{
  return 13;
}

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

  thrust::device_vector<int> vec;

  int result = thrust::inner_product(
    thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.end()), thrust::retag<my_tag>(vec.begin()), 0);

  ASSERT_EQ(13, result);
}

TYPED_TEST(InnerProductTests, InnerProductWithOperator)
{
  using Vector = typename TestFixture::input_type;
  using Policy = typename TestFixture::execution_policy;
  using T      = typename Vector::value_type;

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

  T error_margin = (T) 0.01;

  Vector v1(3);
  Vector v2(3);
  v1[0] = 1;
  v1[1] = -2;
  v1[2] = 3;
  v2[0] = -1;
  v2[1] = 3;
  v2[2] = 6;

  // compute (v1 - v2) and perform a multiplies reduction
  T init   = 3;
  T result = thrust::inner_product(
    Policy{}, v1.begin(), v1.end(), v2.begin(), init, thrust::multiplies<T>(), thrust::minus<T>());
  ASSERT_NEAR(result, (T) 90, error_margin);
}

TYPED_TEST(PrimitiveInnerProductTests, InnerProductWithRandomData)
{
  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);

    T error_margin = static_cast<T>(0.01) * size;

    T min = saturate_cast<T>(-10);
    T max = saturate_cast<T>(10);

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

      thrust::host_vector<T> h_v1 = get_random_data<T>(size, min, max, seed);
      thrust::host_vector<T> h_v2 = get_random_data<T>(size, min, max, seed + seed_value_addition);

      thrust::device_vector<T> d_v1 = h_v1;
      thrust::device_vector<T> d_v2 = h_v2;

      T init = 13;

      T expected = thrust::inner_product(h_v1.begin(), h_v1.end(), h_v2.begin(), init);
      T result   = thrust::inner_product(d_v1.begin(), d_v1.end(), d_v2.begin(), init);

      ASSERT_NEAR(clip_infinity<T>(expected), clip_infinity<T>(result), error_margin);
    }
  }
};
