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#ifndef PCL_MOMENT_INVARIANTS_H_
#define PCL_MOMENT_INVARIANTS_H_

#include <pcl/features/feature.h>

namespace pcl
{
  /** \brief MomentInvariantsEstimation estimates the 3 moment invariants (j1, j2, j3) at each 3D point.
    *
    * \note The code is stateful as we do not expect this class to be multicore parallelized. Please look at
    * \ref NormalEstimationOMP for an example on how to extend this to parallel implementations.
    * \author Radu B. Rusu
    * \ingroup features
    */
  template <typename PointInT, typename PointOutT>
  class MomentInvariantsEstimation: public Feature<PointInT, PointOutT>
  {
    public:
      typedef boost::shared_ptr<MomentInvariantsEstimation<PointInT, PointOutT> > Ptr;
      typedef boost::shared_ptr<const MomentInvariantsEstimation<PointInT, PointOutT> > ConstPtr;
      using Feature<PointInT, PointOutT>::feature_name_;
      using Feature<PointInT, PointOutT>::getClassName;
      using Feature<PointInT, PointOutT>::indices_;
      using Feature<PointInT, PointOutT>::k_;
      using Feature<PointInT, PointOutT>::search_parameter_;
      using Feature<PointInT, PointOutT>::surface_;
      using Feature<PointInT, PointOutT>::input_;

      typedef typename Feature<PointInT, PointOutT>::PointCloudOut PointCloudOut;

      /** \brief Empty constructor. */
      MomentInvariantsEstimation () : xyz_centroid_ (), temp_pt_ ()
      {
        feature_name_ = "MomentInvariantsEstimation";
      };

      /** \brief Compute the 3 moment invariants (j1, j2, j3) for a given set of points, using their indices.
        * \param[in] cloud the input point cloud
        * \param[in] indices the point cloud indices that need to be used
        * \param[out] j1 the resultant first moment invariant
        * \param[out] j2 the resultant second moment invariant
        * \param[out] j3 the resultant third moment invariant
        */
      void 
      computePointMomentInvariants (const pcl::PointCloud<PointInT> &cloud, 
                                    const std::vector<int> &indices, 
                                    float &j1, float &j2, float &j3);

      /** \brief Compute the 3 moment invariants (j1, j2, j3) for a given set of points, using their indices.
        * \param[in] cloud the input point cloud
        * \param[out] j1 the resultant first moment invariant
        * \param[out] j2 the resultant second moment invariant
        * \param[out] j3 the resultant third moment invariant
        */
      void 
      computePointMomentInvariants (const pcl::PointCloud<PointInT> &cloud, 
                                    float &j1, float &j2, float &j3);

    protected:

      /** \brief Estimate moment invariants for all points given in <setInputCloud (), setIndices ()> using the surface
        * in setSearchSurface () and the spatial locator in setSearchMethod ()
        * \param[out] output the resultant point cloud model dataset that contains the moment invariants
        */
      void 
      computeFeature (PointCloudOut &output);
    private:
      /** \brief 16-bytes aligned placeholder for the XYZ centroid of a surface patch. */
      Eigen::Vector4f xyz_centroid_;

      /** \brief Internal data vector. */
      Eigen::Vector4f temp_pt_;
  };
}

#ifdef PCL_NO_PRECOMPILE
#include <pcl/features/impl/moment_invariants.hpp>
#endif

#endif  //#ifndef PCL_MOMENT_INVARIANTS_H_
