#include <thrust/execution_policy.h>
#include <thrust/sequence.h>

#include <unittest/unittest.h>

#ifdef THRUST_TEST_DEVICE_SIDE
template <typename ExecutionPolicy, typename Iterator>
__global__ void sequence_kernel(ExecutionPolicy exec, Iterator first, Iterator last)
{
  thrust::sequence(exec, first, last);
}

template <typename ExecutionPolicy, typename Iterator, typename T>
__global__ void sequence_kernel(ExecutionPolicy exec, Iterator first, Iterator last, T init)
{
  thrust::sequence(exec, first, last, init);
}

template <typename ExecutionPolicy, typename Iterator, typename T>
__global__ void sequence_kernel(ExecutionPolicy exec, Iterator first, Iterator last, T init, T step)
{
  thrust::sequence(exec, first, last, init, step);
}

template <typename ExecutionPolicy>
void TestSequenceDevice(ExecutionPolicy exec)
{
  thrust::device_vector<int> v(5);

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

  thrust::device_vector<int> ref{0, 1, 2, 3, 4};
  ASSERT_EQUAL(v, ref);

  sequence_kernel<<<1, 1>>>(exec, v.begin(), v.end(), 10);
  {
    cudaError_t const err = cudaDeviceSynchronize();
    ASSERT_EQUAL(cudaSuccess, err);
  }

  ref = {10, 11, 12, 13, 14};
  ASSERT_EQUAL(v, ref);

  sequence_kernel<<<1, 1>>>(exec, v.begin(), v.end(), 10, 2);
  {
    cudaError_t const err = cudaDeviceSynchronize();
    ASSERT_EQUAL(cudaSuccess, err);
  }

  ref = {10, 12, 14, 16, 18};
  ASSERT_EQUAL(v, ref);
}

void TestSequenceDeviceSeq()
{
  TestSequenceDevice(thrust::seq);
}
DECLARE_UNITTEST(TestSequenceDeviceSeq);

void TestSequenceDeviceDevice()
{
  TestSequenceDevice(thrust::device);
}
DECLARE_UNITTEST(TestSequenceDeviceDevice);
#endif

void TestSequenceCudaStreams()
{
  using Vector = thrust::device_vector<int>;

  Vector v(5);

  cudaStream_t s;
  cudaStreamCreate(&s);

  thrust::sequence(thrust::cuda::par.on(s), v.begin(), v.end());
  cudaStreamSynchronize(s);

  Vector ref{0, 1, 2, 3, 4};
  ASSERT_EQUAL(v, ref);

  thrust::sequence(thrust::cuda::par.on(s), v.begin(), v.end(), 10);
  cudaStreamSynchronize(s);

  ref = {10, 11, 12, 13, 14};
  ASSERT_EQUAL(v, ref);

  thrust::sequence(thrust::cuda::par.on(s), v.begin(), v.end(), 10, 2);
  cudaStreamSynchronize(s);

  ref = {10, 12, 14, 16, 18};
  ASSERT_EQUAL(v, ref);

  cudaStreamDestroy(s);
}
DECLARE_UNITTEST(TestSequenceCudaStreams);