#include <unittest/unittest.h>
#include <thrust/merge.h>
#include <thrust/functional.h>
#include <thrust/sort.h>
#include <thrust/unique.h>

template<typename U>
  void TestMergeKeyValue(size_t n)
{
  typedef key_value<U,U> T;

  thrust::host_vector<U> h_keys_a   = unittest::random_integers<U>(n);
  thrust::host_vector<U> h_values_a = unittest::random_integers<U>(n);

  thrust::host_vector<U> h_keys_b   = unittest::random_integers<U>(n);
  thrust::host_vector<U> h_values_b = unittest::random_integers<U>(n);

  thrust::host_vector<T> h_a(n), h_b(n);
  for(size_t i = 0; i < n; ++i)
  {
    h_a[i] = T(h_keys_a[i], h_values_a[i]);
    h_b[i] = T(h_keys_b[i], h_values_b[i]);
  }

  thrust::stable_sort(h_a.begin(), h_a.end());
  thrust::stable_sort(h_b.begin(), h_b.end());

  thrust::device_vector<T> d_a = h_a;
  thrust::device_vector<T> d_b = h_b;

  thrust::host_vector<T>   h_result(h_a.size() + h_b.size());
  thrust::device_vector<T> d_result(d_a.size() + d_b.size());

  typename thrust::host_vector<T>::iterator   h_end;
  typename thrust::device_vector<T>::iterator d_end;
  
  h_end = thrust::merge(h_a.begin(), h_a.end(),
                        h_b.begin(), h_b.end(),
                        h_result.begin());

  d_end = thrust::merge(d_a.begin(), d_a.end(),
                        d_b.begin(), d_b.end(),
                        d_result.begin());

  ASSERT_EQUAL_QUIET(h_result, d_result);
}
DECLARE_VARIABLE_UNITTEST(TestMergeKeyValue);

template<typename U>
  void TestMergeKeyValueDescending(size_t n)
{
  typedef key_value<U,U> T;

  thrust::host_vector<U> h_keys_a   = unittest::random_integers<U>(n);
  thrust::host_vector<U> h_values_a = unittest::random_integers<U>(n);

  thrust::host_vector<U> h_keys_b   = unittest::random_integers<U>(n);
  thrust::host_vector<U> h_values_b = unittest::random_integers<U>(n);

  thrust::host_vector<T> h_a(n), h_b(n);
  for(size_t i = 0; i < n; ++i)
  {
    h_a[i] = T(h_keys_a[i], h_values_a[i]);
    h_b[i] = T(h_keys_b[i], h_values_b[i]);
  }

  thrust::stable_sort(h_a.begin(), h_a.end(), thrust::greater<T>());
  thrust::stable_sort(h_b.begin(), h_b.end(), thrust::greater<T>());

  thrust::device_vector<T> d_a = h_a;
  thrust::device_vector<T> d_b = h_b;

  thrust::host_vector<T>   h_result(h_a.size() + h_b.size());
  thrust::device_vector<T> d_result(d_a.size() + d_b.size());

  typename thrust::host_vector<T>::iterator   h_end;
  typename thrust::device_vector<T>::iterator d_end;
  
  h_end = thrust::merge(h_a.begin(), h_a.end(),
                        h_b.begin(), h_b.end(),
                        h_result.begin(),
                        thrust::greater<T>());

  d_end = thrust::merge(d_a.begin(), d_a.end(),
                        d_b.begin(), d_b.end(),
                        d_result.begin(),
                        thrust::greater<T>());

  ASSERT_EQUAL_QUIET(h_result, d_result);
}
DECLARE_VARIABLE_UNITTEST(TestMergeKeyValueDescending);