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#ifndef PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_H_
#define PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_H_

#include <pcl/correspondence.h>
#include <pcl/common/transforms.h>
#include <pcl/registration/correspondence_types.h>

namespace pcl
{
  namespace registration
  {
    /** \brief TransformationEstimation represents the base class for methods for transformation estimation based on:
      *   - correspondence vectors
      *   - two point clouds (source and target) of the same size
      *   - a point cloud with a set of indices (source), and another point cloud (target)
      *   - two point clouds with two sets of indices (source and target) of the same size
      *
      * \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 Dirk Holz, Radu B. Rusu
      * \ingroup registration
      */
    template <typename PointSource, typename PointTarget, typename Scalar = float>
    class TransformationEstimation
    {
      public:
        typedef Eigen::Matrix<Scalar, 4, 4> Matrix4;

        TransformationEstimation () {};
        virtual ~TransformationEstimation () {};

        /** \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
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            Matrix4 &transformation_matrix) const = 0;

        /** \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
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const std::vector<int> &indices_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            Matrix4 &transformation_matrix) const = 0;

        /** \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
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const std::vector<int> &indices_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            const std::vector<int> &indices_tgt,
            Matrix4 &transformation_matrix) const = 0;

        /** \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
          */
        virtual void
        estimateRigidTransformation (
            const pcl::PointCloud<PointSource> &cloud_src,
            const pcl::PointCloud<PointTarget> &cloud_tgt,
            const pcl::Correspondences &correspondences,
            Matrix4 &transformation_matrix) const = 0;


        typedef boost::shared_ptr<TransformationEstimation<PointSource, PointTarget, Scalar> > Ptr;
        typedef boost::shared_ptr<const TransformationEstimation<PointSource, PointTarget, Scalar> > ConstPtr;
    };
  }
}

#endif /* PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_H_ */
