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#pragma once

#include <pcl/registration/transformation_estimation.h>

namespace pcl {
namespace registration {
/** \brief TransformationEstimation3Points represents the class for transformation
 * estimation based on:
 *   - correspondence vectors of 3 pairs (planar case)
 *   - two point clouds (source and target) of size 3
 *   - a point cloud with a set of 3 indices (source), and another point cloud (target)
 *   - two point clouds with two sets of indices (source and target) of the size 3
 *
 * \note The class is templated on the source and target point types as well as on the
 * output scalar of the transformation matrix (i.e., float or double). Default: float.
 *
 * \author P.W.Theiler
 * \ingroup registration
 */
template <typename PointSource, typename PointTarget, typename Scalar = float>
class TransformationEstimation3Point
: public TransformationEstimation<PointSource, PointTarget, Scalar> {
public:
  /** \cond */
  using Ptr =
      shared_ptr<TransformationEstimation3Point<PointSource, PointTarget, Scalar>>;
  using ConstPtr = shared_ptr<
      const TransformationEstimation3Point<PointSource, PointTarget, Scalar>>;
  using Matrix4 =
      typename TransformationEstimation<PointSource, PointTarget, Scalar>::Matrix4;
  /** \endcond */

  /** \brief Constructor */
  TransformationEstimation3Point() = default;

  /** \brief Destructor */
  ~TransformationEstimation3Point() override = default;

  /** \brief Estimate a rigid rotation transformation between a source and a target
   * point cloud. \param[in] cloud_src the source point cloud dataset \param[in]
   * cloud_tgt the target point cloud dataset \param[out] transformation_matrix the
   * resultant transformation matrix
   */
  void
  estimateRigidTransformation(const pcl::PointCloud<PointSource>& cloud_src,
                              const pcl::PointCloud<PointTarget>& cloud_tgt,
                              Matrix4& transformation_matrix) const override;

  /** \brief Estimate a rigid rotation transformation between a source and a target
   * point cloud. \param[in] cloud_src the source point cloud dataset \param[in]
   * indices_src the vector of indices describing the points of interest in \a cloud_src
   * \param[in] cloud_tgt the target point cloud dataset
   * \param[out] transformation_matrix the resultant transformation matrix
   */
  void
  estimateRigidTransformation(const pcl::PointCloud<PointSource>& cloud_src,
                              const pcl::Indices& indices_src,
                              const pcl::PointCloud<PointTarget>& cloud_tgt,
                              Matrix4& transformation_matrix) const override;

  /** \brief Estimate a rigid rotation transformation between a source and a target
   * point cloud. \param[in] cloud_src the source point cloud dataset \param[in]
   * indices_src the vector of indices describing the points of interest in \a cloud_src
   * \param[in] cloud_tgt the target point cloud dataset
   * \param[in] indices_tgt the vector of indices describing the correspondences of the
   * interest points from \a indices_src
   * \param[out] transformation_matrix the resultant transformation matrix
   */
  void
  estimateRigidTransformation(const pcl::PointCloud<PointSource>& cloud_src,
                              const pcl::Indices& indices_src,
                              const pcl::PointCloud<PointTarget>& cloud_tgt,
                              const pcl::Indices& indices_tgt,
                              Matrix4& transformation_matrix) const override;

  /** \brief Estimate a rigid rotation transformation between a source and a target
   * point cloud. \param[in] cloud_src the source point cloud dataset \param[in]
   * cloud_tgt the target point cloud dataset \param[in] correspondences the vector of
   * correspondences between source and target point cloud \param[out]
   * transformation_matrix the resultant transformation matrix
   */
  void
  estimateRigidTransformation(const pcl::PointCloud<PointSource>& cloud_src,
                              const pcl::PointCloud<PointTarget>& cloud_tgt,
                              const pcl::Correspondences& correspondences,
                              Matrix4& transformation_matrix) const override;

protected:
  /** \brief Estimate a rigid rotation transformation between a source and a target
   * \param[in] source_it an iterator over the source point cloud dataset
   * \param[in] target_it an iterator over the target point cloud dataset
   * \param[out] transformation_matrix the resultant transformation matrix
   */
  void
  estimateRigidTransformation(ConstCloudIterator<PointSource>& source_it,
                              ConstCloudIterator<PointTarget>& target_it,
                              Matrix4& transformation_matrix) const;
};
}; // namespace registration
}; // namespace pcl

#include <pcl/registration/impl/transformation_estimation_3point.hpp>
