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#include <pcl/test/gtest.h>

#include <pcl/common/generate.h>
#include <pcl/common/random.h>
#include <pcl/filters/uniform_sampling.h>
#include <pcl/point_types.h>

TEST(UniformSampling, extractRemovedIndices)
{
  using namespace pcl::common;
  constexpr int SEED = 1234;
  CloudGenerator<pcl::PointXYZ, UniformGenerator<float>> generator;
  UniformGenerator<float>::Parameters x_params(0, 1, SEED + 1);
  generator.setParametersForX(x_params);
  UniformGenerator<float>::Parameters y_params(0, 1, SEED + 2);
  generator.setParametersForY(y_params);
  UniformGenerator<float>::Parameters z_params(0, 1, SEED + 3);
  generator.setParametersForZ(z_params);
  pcl::PointCloud<pcl::PointXYZ>::Ptr xyz(new pcl::PointCloud<pcl::PointXYZ>);
  generator.fill(100, 100, *xyz);

  // The generated cloud points are distributed in the unit cube. By using 0.1 sized
  // voxels for sampling, we divide each side of the cube into 1 / 0.1 = 10 cells, in
  // total 10^3 = 1000 cells. Since we generated a large amount of points, we can be
  // sure that each cell has at least one point. As a result, we expect 1000 points in
  // the output cloud and the rest in removed indices.

  pcl::UniformSampling<pcl::PointXYZ> us(true); // extract removed indices
  us.setInputCloud(xyz);
  us.setRadiusSearch(0.1);
  pcl::PointCloud<pcl::PointXYZ> output;
  us.filter(output);

  auto removed_indices = us.getRemovedIndices();
  ASSERT_EQ(output.size(), 1000);
  EXPECT_EQ(removed_indices->size(), xyz->size() - 1000);
  std::set<int> removed_indices_set(removed_indices->begin(), removed_indices->end());
  ASSERT_EQ(removed_indices_set.size(), removed_indices->size());
}

int
main(int argc, char** argv)
{
  testing::InitGoogleTest(&argc, argv);
  return (RUN_ALL_TESTS());
}
