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#ifndef PCL_SEGMENTATION_PLANE_COEFFICIENT_COMPARATOR_H_
#define PCL_SEGMENTATION_PLANE_COEFFICIENT_COMPARATOR_H_

#include <pcl/common/angles.h>
#include <pcl/segmentation/boost.h>
#include <pcl/segmentation/comparator.h>

namespace pcl
{
  /** \brief PlaneCoefficientComparator is a Comparator that operates on plane coefficients, for use in planar segmentation.
    * In conjunction with OrganizedConnectedComponentSegmentation, this allows planes to be segmented from organized data.
    *
    * \author Alex Trevor
    */
  template<typename PointT, typename PointNT>
  class PlaneCoefficientComparator: public Comparator<PointT>
  {
    public:
      typedef typename Comparator<PointT>::PointCloud PointCloud;
      typedef typename Comparator<PointT>::PointCloudConstPtr PointCloudConstPtr;
      
      typedef typename pcl::PointCloud<PointNT> PointCloudN;
      typedef typename PointCloudN::Ptr PointCloudNPtr;
      typedef typename PointCloudN::ConstPtr PointCloudNConstPtr;
      
      typedef boost::shared_ptr<PlaneCoefficientComparator<PointT, PointNT> > Ptr;
      typedef boost::shared_ptr<const PlaneCoefficientComparator<PointT, PointNT> > ConstPtr;

      using pcl::Comparator<PointT>::input_;
      
      /** \brief Empty constructor for PlaneCoefficientComparator. */
      PlaneCoefficientComparator ()
        : normals_ ()
        , plane_coeff_d_ ()
        , angular_threshold_ (pcl::deg2rad (2.0f))
        , distance_threshold_ (0.02f)
        , depth_dependent_ (true)
        , z_axis_ (Eigen::Vector3f (0.0, 0.0, 1.0) )
      {
      }

      /** \brief Constructor for PlaneCoefficientComparator.
        * \param[in] plane_coeff_d a reference to a vector of d coefficients of plane equations.  Must be the same size as the input cloud and input normals.  a, b, and c coefficients are in the input normals.
        */
      PlaneCoefficientComparator (boost::shared_ptr<std::vector<float> >& plane_coeff_d) 
        : normals_ ()
        , plane_coeff_d_ (plane_coeff_d)
        , angular_threshold_ (pcl::deg2rad (2.0f))
        , distance_threshold_ (0.02f)
        , depth_dependent_ (true)
        , z_axis_ (Eigen::Vector3f (0.0f, 0.0f, 1.0f) )
      {
      }
      
      /** \brief Destructor for PlaneCoefficientComparator. */
      virtual
      ~PlaneCoefficientComparator ()
      {
      }

      virtual void 
      setInputCloud (const PointCloudConstPtr& cloud)
      {
        input_ = cloud;
      }
      
      /** \brief Provide a pointer to the input normals.
        * \param[in] normals the input normal cloud
        */
      inline void
      setInputNormals (const PointCloudNConstPtr &normals)
      {
        normals_ = normals;
      }

      /** \brief Get the input normals. */
      inline PointCloudNConstPtr
      getInputNormals () const
      {
        return (normals_);
      }

      /** \brief Provide a pointer to a vector of the d-coefficient of the planes' hessian normal form.  a, b, and c are provided by the normal cloud.
        * \param[in] plane_coeff_d a pointer to the plane coefficients.
        */
      void
      setPlaneCoeffD (boost::shared_ptr<std::vector<float> >& plane_coeff_d)
      {
        plane_coeff_d_ = plane_coeff_d;
      }

      /** \brief Provide a pointer to a vector of the d-coefficient of the planes' hessian normal form.  a, b, and c are provided by the normal cloud.
        * \param[in] plane_coeff_d a pointer to the plane coefficients.
        */
      void
      setPlaneCoeffD (std::vector<float>& plane_coeff_d)
      {
        plane_coeff_d_ = boost::make_shared<std::vector<float> >(plane_coeff_d);
      }
      
      /** \brief Get a pointer to the vector of the d-coefficient of the planes' hessian normal form. */
      const std::vector<float>&
      getPlaneCoeffD () const
      {
        return (*plane_coeff_d_);
      }

      /** \brief Set the tolerance in radians for difference in normal direction between neighboring points, to be considered part of the same plane.
        * \param[in] angular_threshold the tolerance in radians
        */
      virtual void
      setAngularThreshold (float angular_threshold)
      {
        angular_threshold_ = cosf (angular_threshold);
      }
      
      /** \brief Get the angular threshold in radians for difference in normal direction between neighboring points, to be considered part of the same plane. */
      inline float
      getAngularThreshold () const
      {
        return (acosf (angular_threshold_) );
      }

      /** \brief Set the tolerance in meters for difference in perpendicular distance (d component of plane equation) to the plane between neighboring points, to be considered part of the same plane.
        * \param[in] distance_threshold the tolerance in meters (at 1m)
        * \param[in] depth_dependent whether to scale the threshold based on range from the sensor (default: false)
        */
      void
      setDistanceThreshold (float distance_threshold, 
                            bool depth_dependent = false)
      {
        distance_threshold_ = distance_threshold;
        depth_dependent_ = depth_dependent;
      }

      /** \brief Get the distance threshold in meters (d component of plane equation) between neighboring points, to be considered part of the same plane. */
      inline float
      getDistanceThreshold () const
      {
        return (distance_threshold_);
      }
      
      /** \brief Compare points at two indices by their plane equations.  True if the angle between the normals is less than the angular threshold,
        * and the difference between the d component of the normals is less than distance threshold, else false
        * \param idx1 The first index for the comparison
        * \param idx2 The second index for the comparison
        */
      virtual bool
      compare (int idx1, int idx2) const
      {
        float threshold = distance_threshold_;
        if (depth_dependent_)
        {
          Eigen::Vector3f vec = input_->points[idx1].getVector3fMap ();
          
          float z = vec.dot (z_axis_);
          threshold *= z * z;
        }
        return ( (fabs ((*plane_coeff_d_)[idx1] - (*plane_coeff_d_)[idx2]) < threshold)
                 && (normals_->points[idx1].getNormalVector3fMap ().dot (normals_->points[idx2].getNormalVector3fMap () ) > angular_threshold_ ) );
      }
      
    protected:
      PointCloudNConstPtr normals_;
      boost::shared_ptr<std::vector<float> > plane_coeff_d_;
      float angular_threshold_;
      float distance_threshold_;
      bool depth_dependent_;
      Eigen::Vector3f z_axis_;

    public:
      EIGEN_MAKE_ALIGNED_OPERATOR_NEW
  };
}

#endif // PCL_SEGMENTATION_PLANE_COEFFICIENT_COMPARATOR_H_
