/*
 *  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/execution_policy.h>
#include <thrust/sort.h>

#include <unittest/unittest.h>

#ifdef THRUST_TEST_DEVICE_SIDE
template <typename ExecutionPolicy, typename Iterator, typename Iterator2>
__global__ void is_sorted_kernel(ExecutionPolicy exec, Iterator first, Iterator last, Iterator2 result)
{
  *result = thrust::is_sorted(exec, first, last);
}

template <typename ExecutionPolicy>
void TestIsSortedDevice(ExecutionPolicy exec)
{
  size_t n = 1000;

  thrust::device_vector<int> v = unittest::random_integers<int>(n);

  thrust::device_vector<bool> result(1);

  v[0] = 1;
  v[1] = 0;

  is_sorted_kernel<<<1, 1>>>(exec, v.begin(), v.end(), result.begin());

  {
    cudaError_t const err = cudaDeviceSynchronize();
    ASSERT_EQUAL(cudaSuccess, err);
  }

  ASSERT_EQUAL(false, result[0]);

  thrust::sort(v.begin(), v.end());

  is_sorted_kernel<<<1, 1>>>(exec, v.begin(), v.end(), result.begin());
  {
    cudaError_t const err = cudaDeviceSynchronize();
    ASSERT_EQUAL(cudaSuccess, err);
  }

  ASSERT_EQUAL(true, result[0]);
}

void TestIsSortedDeviceSeq()
{
  TestIsSortedDevice(thrust::seq);
}
DECLARE_UNITTEST(TestIsSortedDeviceSeq);

void TestIsSortedDeviceDevice()
{
  TestIsSortedDevice(thrust::device);
}
DECLARE_UNITTEST(TestIsSortedDeviceDevice);
#endif

void TestIsSortedCudaStreams()
{
  thrust::device_vector<int> v(4);
  v[0] = 0;
  v[1] = 5;
  v[2] = 8;
  v[3] = 0;

  cudaStream_t s;
  cudaStreamCreate(&s);

  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 0), true);
  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 1), true);

  // the following line crashes gcc 4.3
#if (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
  // do nothing
#else
  // compile this line on other compilers
  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 2), true);
#endif // GCC

  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 3), true);
  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 4), false);

  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 3, thrust::less<int>()), true);

  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 1, thrust::greater<int>()), true);
  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.begin() + 4, thrust::greater<int>()), false);

  ASSERT_EQUAL(thrust::is_sorted(thrust::cuda::par.on(s), v.begin(), v.end()), false);

  cudaStreamDestroy(s);
}
DECLARE_UNITTEST(TestIsSortedCudaStreams);
