/*
 *  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/generate.h>
#include <thrust/random.h>

#include <sstream>

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

#if !_THRUST_HAS_DEVICE_SYSTEM_STD
#  include <type_traits>
#endif

template <typename Engine>
struct ValidateEngine
{
  THRUST_HOST_DEVICE ValidateEngine(const typename Engine::result_type value_10000)
      : m_value_10000(value_10000)
  {}

  THRUST_HOST_DEVICE bool operator()(void) const
  {
    Engine e;
    e.discard(9999);

    // get the 10Kth result
    return e() == m_value_10000;
  }

  const typename Engine::result_type m_value_10000;
}; // end ValidateEngine

template <typename Engine, bool trivial_min = (Engine::min == 0)>
struct ValidateEngineMin
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    Engine e;

    bool result = true;

    for (int i = 0; i < 10000; ++i)
    {
      result &= (e() >= Engine::min);
    }

    return result;
  }
}; // end ValidateEngineMin

template <typename Engine>
struct ValidateEngineMin<Engine, true>
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    return true;
  }
};

template <typename Engine>
struct ValidateEngineMax
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    Engine e;

    bool result = true;

    for (int i = 0; i < 10000; ++i)
    {
      result &= (e() <= Engine::max);
    }

    return result;
  }
}; // end ValidateEngineMax

template <typename Engine>
struct ValidateEngineEqual
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    bool result = true;

    // test from default constructor
    Engine e0, e1;
    result &= (e0 == e1);

    // advance engines
    e0.discard(10000);
    e1.discard(10000);
    result &= (e0 == e1);

    // test from identical seeds
    Engine e2(13), e3(13);
    result &= (e2 == e3);

    // test different seeds aren't equal
    Engine e4(7), e5(13);
    result &= !(e4 == e5);

    // test reseeding engine to the same seed causes equality
    e4.seed(13);
    result &= (e4 == e5);

    return result;
  }
};

template <typename Engine>
struct ValidateEngineUnequal
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    bool result = true;

    // test from default constructor
    Engine e0, e1;
    result &= !(e0 != e1);

    // advance engines
    e0.discard(1000);
    e1.discard(1000);
    result &= !(e0 != e1);

    // test from identical seeds
    Engine e2(13), e3(13);
    result &= !(e2 != e3);

    // test different seeds aren't equal
    Engine e4(7), e5(13);
    result &= (e4 != e5);

    // test reseeding engine to the same seed causes equality
    e4.seed(13);
    result &= !(e4 != e5);

    // test different discards causes inequality
    Engine e6(13), e7(13);
    e6.discard(500);
    e7.discard(1000);
    result &= (e6 != e7);

    return result;
  }
};

template <typename Distribution, typename Engine>
struct ValidateDistributionMin
{
  using random_engine = Engine;

  THRUST_HOST_DEVICE ValidateDistributionMin(const Distribution& dd)
      : d(dd)
  {}

  THRUST_HOST_DEVICE bool operator()(void)
  {
    Engine e;

    bool result = true;

    for (int i = 0; i < 10000; ++i)
    {
      result &= (d(e) >= d.min());
    }

    return result;
  }

  Distribution d;
};

template <typename Distribution, typename Engine>
struct ValidateDistributionMax
{
  using random_engine = Engine;

  THRUST_HOST_DEVICE ValidateDistributionMax(const Distribution& dd)
      : d(dd)
  {}

  THRUST_HOST_DEVICE bool operator()(void)
  {
    Engine e;

    bool result = true;

    for (int i = 0; i < 10000; ++i)
    {
      result &= (d(e) <= d.max());
    }

    return result;
  }

  Distribution d;
};

template <typename Distribution>
struct ValidateDistributionEqual
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    return d0 == d1;
  }

  Distribution d0, d1;
};

template <typename Distribution>
struct ValidateDistributionUnqual
{
  THRUST_HOST_DEVICE bool operator()(void) const
  {
    return d0 != d1;
  }

  Distribution d0, d1;
};

#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_HIP

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

  ASSERT_EQ(THRUST_DEVICE_SYSTEM, THRUST_DEVICE_SYSTEM_HIP);
}

#endif

template <typename Engine, std::uint64_t value_10000>
void TestEngineValidation()
{
  // test host
  thrust::host_vector<bool> h(1);
  thrust::generate(h.begin(), h.end(), ValidateEngine<Engine>(value_10000));

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::device_vector<bool> d(1);
  thrust::generate(d.begin(), d.end(), ValidateEngine<Engine>(value_10000));

  ASSERT_EQ(true, d[0]);
}

template <typename Engine>
void TestEngineMax()
{
  // test host
  thrust::host_vector<bool> h(1);
  thrust::generate(h.begin(), h.end(), ValidateEngineMax<Engine>());

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::device_vector<bool> d(1);
  thrust::generate(d.begin(), d.end(), ValidateEngineMax<Engine>());

  ASSERT_EQ(true, d[0]);
}

template <typename Engine>
void TestEngineMin()
{
  // test host
  thrust::host_vector<bool> h(1);
  thrust::generate(h.begin(), h.end(), ValidateEngineMin<Engine>());

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::device_vector<bool> d(1);
  thrust::generate(d.begin(), d.end(), ValidateEngineMin<Engine>());

  ASSERT_EQ(true, d[0]);
}

template <typename Engine>
void TestEngineSaveRestore()
{
  // create a default engine
  Engine e0;

  // run it for a while
  e0.discard(10000);

  // save it
  std::stringstream ss;
  ss << e0;

  // run it a while longer
  e0.discard(10000);

  // restore old state
  Engine e1;
  ss >> e1;

  // run e1 a while longer
  e1.discard(10000);

  // both should return the same result

  ASSERT_EQ(e0(), e1());
}

template <typename Engine>
void TestEngineEqual()
{
  ValidateEngineEqual<Engine> f;

  // test host
  thrust::host_vector<bool> h(1);
  thrust::generate(h.begin(), h.end(), f);

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::device_vector<bool> d(1);
  thrust::generate(d.begin(), d.end(), f);

  ASSERT_EQ(true, d[0]);
}

template <typename Engine>
void TestEngineUnequal()
{
  ValidateEngineUnequal<Engine> f;

  // test host
  thrust::host_vector<bool> h(1);
  thrust::generate(h.begin(), h.end(), f);

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::device_vector<bool> d(1);
  thrust::generate(d.begin(), d.end(), f);

  ASSERT_EQ(true, d[0]);
}

TEST(RandomTests, TestRanlux24BaseValidation)
{
  using Engine = thrust::random::ranlux24_base;

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

  TestEngineValidation<Engine, 7937952u>();
}

TEST(RandomTests, TestRanlux24BaseMin)
{
  using Engine = thrust::random::ranlux24_base;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestRanlux24BaseMax)
{
  using Engine = thrust::random::ranlux24_base;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestRanlux24BaseSaveRestore)
{
  using Engine = thrust::random::ranlux24_base;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestRanlux24BaseEqual)
{
  using Engine = thrust::random::ranlux24_base;

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

  TestEngineEqual<Engine>();
}

TEST(RandomTests, TestRanlux24BaseUnequal)
{
  using Engine = thrust::random::ranlux24_base;

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

  TestEngineUnequal<Engine>();
}

TEST(RandomTests, TestRanlux48BaseValidation)
{
  using Engine = thrust::random::ranlux48_base;

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

  TestEngineValidation<Engine, 192113843633948ull>();
}

TEST(RandomTests, TestRanlux48BaseMin)
{
  using Engine = thrust::random::ranlux48_base;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestRanlux48BaseMax)
{
  using Engine = thrust::random::ranlux48_base;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestRanlux48BaseSaveRestore)
{
  using Engine = thrust::random::ranlux48_base;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestRanlux48BaseEqual)
{
  using Engine = thrust::random::ranlux48_base;

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

  TestEngineEqual<Engine>();
}

#if defined(__INTEL_COMPILER) && 1800 >= __INTEL_COMPILER
TEST(RandomTests, TestRanlux48BaseUnequal)
{
  SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

  // ICPC has a known failure with this test.
  // See nvbug 200414000.
  GTEST_NONFATAL_FAILURE_("Known failure")
}
#else
TEST(RandomTests, TestRanlux48BaseUnequal)
{
  using Engine = thrust::random::ranlux48_base;

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

  TestEngineUnequal<Engine>();
}
#endif

TEST(RandomTests, TestMinstdRandValidation)
{
  using Engine = thrust::random::minstd_rand;

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

  TestEngineValidation<Engine, 399268537u>();
}

TEST(RandomTests, TestMinstdRandMin)
{
  using Engine = thrust::random::minstd_rand;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestMinstdRandMax)
{
  using Engine = thrust::random::minstd_rand;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestMinstdRandSaveRestore)
{
  using Engine = thrust::random::minstd_rand;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestMinstdRandEqual)
{
  using Engine = thrust::random::minstd_rand;

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

  TestEngineEqual<Engine>();
}

TEST(RandomTests, TestMinstdRandUnequal)
{
  using Engine = thrust::random::minstd_rand;

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

  TestEngineUnequal<Engine>();
}

TEST(RandomTests, TestMinstdRand0Validation)
{
  using Engine = thrust::random::minstd_rand0;

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

  TestEngineValidation<Engine, 1043618065u>();
}

TEST(RandomTests, TestMinstdRand0Min)
{
  using Engine = thrust::random::minstd_rand0;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestMinstdRand0Max)
{
  using Engine = thrust::random::minstd_rand0;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestMinstdRand0SaveRestore)
{
  using Engine = thrust::random::minstd_rand0;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestMinstdRand0Equal)
{
  using Engine = thrust::random::minstd_rand0;

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

  TestEngineEqual<Engine>();
}

TEST(RandomTests, TestMinstdRand0Unequal)
{
  using Engine = thrust::random::minstd_rand0;

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

  TestEngineUnequal<Engine>();
}

TEST(RandomTests, TestTaus88Validation)
{
  using Engine = thrust::random::taus88;

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

  TestEngineValidation<Engine, 3535848941ull>();
}

TEST(RandomTests, TestTaus88Min)
{
  using Engine = thrust::random::taus88;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestTaus88Max)
{
  using Engine = thrust::random::taus88;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestTaus88SaveRestore)
{
  using Engine = thrust::random::taus88;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestTaus88Equal)
{
  using Engine = thrust::random::taus88;

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

  TestEngineEqual<Engine>();
}

TEST(RandomTests, TestTaus88Unequal)
{
  using Engine = thrust::random::taus88;

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

  TestEngineUnequal<Engine>();
}

TEST(RandomTests, TestRanlux24Validation)
{
  using Engine = thrust::random::ranlux24;

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

  TestEngineValidation<Engine, 9901578>();
}

TEST(RandomTests, TestRanlux24Min)
{
  using Engine = thrust::random::ranlux24;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestRanlux24Max)
{
  using Engine = thrust::random::ranlux24;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestRanlux24SaveRestore)
{
  using Engine = thrust::random::ranlux24;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestRanlux24Equal)
{
  using Engine = thrust::random::ranlux24;

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

  TestEngineEqual<Engine>();
}

TEST(RandomTests, TestRanlux24Unequal)
{
  using Engine = thrust::random::ranlux24;

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

  TestEngineUnequal<Engine>();
}

TEST(RandomTests, TestRanlux48Validation)
{
  using Engine = thrust::random::ranlux48;

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

  TestEngineValidation<Engine, 88229545517833ull>();
}

TEST(RandomTests, TestRanlux48Min)
{
  using Engine = thrust::random::ranlux48;

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

  TestEngineMin<Engine>();
}

TEST(RandomTests, TestRanlux48Max)
{
  using Engine = thrust::random::ranlux48;

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

  TestEngineMax<Engine>();
}

TEST(RandomTests, TestRanlux48SaveRestore)
{
  using Engine = thrust::random::ranlux48;

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

  TestEngineSaveRestore<Engine>();
}

TEST(RandomTests, TestRanlux48Equal)
{
  using Engine = thrust::random::ranlux48;

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

  TestEngineEqual<Engine>();
}

TEST(RandomTests, TestRanlux48Unequal)
{
  using Engine = thrust::random::ranlux48;

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

  TestEngineUnequal<Engine>();
}

THRUST_DIAG_PUSH
THRUST_DIAG_SUPPRESS_MSVC(4305) // truncation warning
template <typename Distribution, typename Validator>
void ValidateDistributionCharacteristic()
{
  using Engine = typename Validator::random_engine;

  // test default-constructed Distribution

  // test host
  thrust::host_vector<bool> h(1);
  thrust::generate(h.begin(), h.end(), Validator(Distribution()));

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::device_vector<bool> d(1);
  thrust::generate(d.begin(), d.end(), Validator(Distribution()));

  ASSERT_EQ(true, d[0]);

  // test distribution & engine with comparable ranges
  // only do this if they have the same result_type
  if (_THRUST_STD::is_same<typename Distribution::result_type, typename Engine::result_type>::value)
  {
    // test Distribution with same range as engine

    // test host
    thrust::generate(h.begin(), h.end(), Validator(Distribution(Engine::min, Engine::max)));

    ASSERT_EQ(true, h[0]);

    // test device
    thrust::generate(d.begin(), d.end(), Validator(Distribution(Engine::min, Engine::max)));

    ASSERT_EQ(true, d[0]);

    // test Distribution with smaller range than engine

    // test host
    typename Distribution::result_type engine_range = Engine::max - Engine::min;
    thrust::generate(h.begin(), h.end(), Validator(Distribution(engine_range / 3, (2 * engine_range) / 3)));

    ASSERT_EQ(true, h[0]);

    // test device
    thrust::generate(d.begin(), d.end(), Validator(Distribution(engine_range / 3, (2 * engine_range) / 3)));

    ASSERT_EQ(true, d[0]);
  }

  // test Distribution with a very small range

  // test host
  thrust::generate(h.begin(), h.end(), Validator(Distribution(1, 6)));

  ASSERT_EQ(true, h[0]);

  // test device
  thrust::generate(d.begin(), d.end(), Validator(Distribution(1, 6)));

  ASSERT_EQ(true, d[0]);
}
THRUST_DIAG_POP

template <typename Distribution>
void TestDistributionSaveRestore()
{
  // create a default distribution
  Distribution d0(7, 13);

  // save it
  std::stringstream ss;
  ss << d0;

  // restore old state
  Distribution d1;
  ss >> d1;

  ASSERT_EQ(d0, d1);
}

TEST(RandomTests, TestUniformIntDistributionMin)
{
  using int_dist  = thrust::random::uniform_int_distribution<int>;
  using uint_dist = thrust::random::uniform_int_distribution<unsigned int>;

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

  ValidateDistributionCharacteristic<int_dist, ValidateDistributionMin<int_dist, thrust::minstd_rand>>();
  ValidateDistributionCharacteristic<uint_dist, ValidateDistributionMin<uint_dist, thrust::minstd_rand>>();
}

TEST(RandomTests, TestUniformIntDistributionMax)
{
  using int_dist  = thrust::random::uniform_int_distribution<int>;
  using uint_dist = thrust::random::uniform_int_distribution<unsigned int>;

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

  ValidateDistributionCharacteristic<int_dist, ValidateDistributionMax<int_dist, thrust::minstd_rand>>();
  ValidateDistributionCharacteristic<uint_dist, ValidateDistributionMax<uint_dist, thrust::minstd_rand>>();
}

TEST(RandomTests, TestUniformIntDistributionSaveRestore)
{
  using int_dist  = thrust::random::uniform_int_distribution<int>;
  using uint_dist = thrust::random::uniform_int_distribution<unsigned int>;

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

  TestDistributionSaveRestore<int_dist>();
  TestDistributionSaveRestore<uint_dist>();
}

TEST(RandomTests, TestUniformRealDistributionMin)
{
  using float_dist  = thrust::random::uniform_real_distribution<float>;
  using double_dist = thrust::random::uniform_real_distribution<double>;

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

  ValidateDistributionCharacteristic<float_dist, ValidateDistributionMin<float_dist, thrust::minstd_rand>>();
  ValidateDistributionCharacteristic<double_dist, ValidateDistributionMin<double_dist, thrust::minstd_rand>>();
}

TEST(RandomTests, TestUniformRealDistributionMax)
{
  using float_dist  = thrust::random::uniform_real_distribution<float>;
  using double_dist = thrust::random::uniform_real_distribution<double>;

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

  ValidateDistributionCharacteristic<float_dist, ValidateDistributionMax<float_dist, thrust::minstd_rand>>();
  ValidateDistributionCharacteristic<double_dist, ValidateDistributionMax<double_dist, thrust::minstd_rand>>();
}

TEST(RandomTests, TestUniformRealDistributionSaveRestore)
{
  using float_dist  = thrust::random::uniform_real_distribution<float>;
  using double_dist = thrust::random::uniform_real_distribution<double>;

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

  TestDistributionSaveRestore<float_dist>();
  TestDistributionSaveRestore<double_dist>();
}

TEST(RandomTests, TestNormalDistributionMin)
{
  using float_dist  = thrust::random::normal_distribution<float>;
  using double_dist = thrust::random::normal_distribution<double>;

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

  ValidateDistributionCharacteristic<float_dist, ValidateDistributionMin<float_dist, thrust::minstd_rand>>();
  ValidateDistributionCharacteristic<double_dist, ValidateDistributionMin<double_dist, thrust::minstd_rand>>();
}

TEST(RandomTests, TestNormalDistributionMax)
{
  using float_dist  = thrust::random::normal_distribution<float>;
  using double_dist = thrust::random::normal_distribution<double>;

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

  ValidateDistributionCharacteristic<float_dist, ValidateDistributionMax<float_dist, thrust::minstd_rand>>();
  ValidateDistributionCharacteristic<double_dist, ValidateDistributionMax<double_dist, thrust::minstd_rand>>();
}

TEST(RandomTests, TestNormalDistributionSaveRestore)
{
  using float_dist  = thrust::random::normal_distribution<float>;
  using double_dist = thrust::random::normal_distribution<double>;

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

  TestDistributionSaveRestore<float_dist>();
  TestDistributionSaveRestore<double_dist>();
}

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

  double inf = std::numeric_limits<double>::infinity();
  double nan = std::nan("undefined");

  double double_inputs[8] = {-3.0, 0.0, 0.0000001, 0.3, 0.7, 1.20, 2.0, 3.0}; // This values are those returned by the
                                                                              // nvidia's double erfcinv(double a)
  double double_expected_outputs[8] = {nan, inf, 3.76656, 0.732869, 0.272463, -0.179143, -inf, nan};

  for (int i = 0; i < 8; i++)
  {
    double input  = double_inputs[i];
    double output = erfcinv(input);

    if (std::isnan(output))
    {
      ASSERT_EQ(std::isnan(output), std::isnan(double_expected_outputs[i]));
    }
    else if ((output == inf) || (output == -inf))
    {
      ASSERT_EQ(output, double_expected_outputs[i]);
    }
    else
    {
      EXPECT_NEAR(double_expected_outputs[i], output, 0.01);
    }
  }

  float inf_f = std::numeric_limits<float>::infinity();
  float nan_f = std::nanf("undefined");

  float float_inputs[8] = {-3.0f, 0.0f, 0.0000001f, 0.3f, 0.7f, 1.20f, 2.0f, 3.0f}; // This values are those returned by
                                                                                    // the nvidia's float erfcinv(float
                                                                                    // a)
  float float_expected_outputs[8] = {nan_f, inf_f, 3.76656, 0.732869, 0.272463, -0.179144, -inf_f, nan_f};

  for (int i = 0; i < 8; i++)
  {
    float input  = float_inputs[i];
    float output = erfcinv(input);

    if (std::isnan(output))
    {
      ASSERT_EQ(std::isnan(output), std::isnan(float_expected_outputs[i]));
    }
    else if ((output == inf_f) || (output == -inf_f))
    {
      ASSERT_EQ(output, float_expected_outputs[i]);
    }
    else
    {
      EXPECT_NEAR(float_expected_outputs[i], output, 0.01);
    }
  }
}