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 * $Id: sac_model_line.h 2326 2011-08-31 07:48:25Z rusu $
 *
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#pragma once

#include <pcl/sample_consensus/sac_model.h>
#include <pcl/sample_consensus/model_types.h>

namespace pcl
{
  /** \brief SampleConsensusModelStick defines a model for 3D stick segmentation. 
    * A stick is a line with a user given minimum/maximum width.
    * The model coefficients are defined as:
    *   - \b point_on_line.x  : the X coordinate of a point on the line
    *   - \b point_on_line.y  : the Y coordinate of a point on the line
    *   - \b point_on_line.z  : the Z coordinate of a point on the line
    *   - \b line_direction.x : the X coordinate of a line's direction
    *   - \b line_direction.y : the Y coordinate of a line's direction
    *   - \b line_direction.z : the Z coordinate of a line's direction
    *   - \b line_width       : the width of the line
    *
    * \author Radu B. Rusu
    * \ingroup sample_consensus
    */
  template <typename PointT>
  class SampleConsensusModelStick : public SampleConsensusModel<PointT>
  {
    public:
      using SampleConsensusModel<PointT>::model_name_;
      using SampleConsensusModel<PointT>::input_;
      using SampleConsensusModel<PointT>::indices_;
      using SampleConsensusModel<PointT>::radius_min_;
      using SampleConsensusModel<PointT>::radius_max_;
      using SampleConsensusModel<PointT>::error_sqr_dists_;
      using SampleConsensusModel<PointT>::isModelValid;

      using PointCloud = typename SampleConsensusModel<PointT>::PointCloud;
      using PointCloudPtr = typename SampleConsensusModel<PointT>::PointCloudPtr;
      using PointCloudConstPtr = typename SampleConsensusModel<PointT>::PointCloudConstPtr;

      using Ptr = shared_ptr<SampleConsensusModelStick<PointT> >;
      using ConstPtr = shared_ptr<const SampleConsensusModelStick<PointT>>;

      /** \brief Constructor for base SampleConsensusModelStick.
        * \param[in] cloud the input point cloud dataset
        * \param[in] random if true set the random seed to the current time, else set to 12345 (default: false)
        */
      SampleConsensusModelStick (const PointCloudConstPtr &cloud,
                                 bool random = false) 
        : SampleConsensusModel<PointT> (cloud, random)
      {
        model_name_ = "SampleConsensusModelStick";
        sample_size_ = 2;
        model_size_ = 7;
      }

      /** \brief Constructor for base SampleConsensusModelStick.
        * \param[in] cloud the input point cloud dataset
        * \param[in] indices a vector of point indices to be used from \a cloud
        * \param[in] random if true set the random seed to the current time, else set to 12345 (default: false)
        */
      SampleConsensusModelStick (const PointCloudConstPtr &cloud, 
                                 const Indices &indices,
                                 bool random = false) 
        : SampleConsensusModel<PointT> (cloud, indices, random)
      {
        model_name_ = "SampleConsensusModelStick";
        sample_size_ = 2;
        model_size_ = 7;
      }
      
      /** \brief Empty destructor */
      ~SampleConsensusModelStick () {}

      /** \brief Check whether the given index samples can form a valid stick model, compute the model coefficients from
        * these samples and store them internally in model_coefficients_. The stick coefficients are represented by a
        * point and a line direction
        * \param[in] samples the point indices found as possible good candidates for creating a valid model
        * \param[out] model_coefficients the resultant model coefficients
        */
      bool
      computeModelCoefficients (const Indices &samples,
                                Eigen::VectorXf &model_coefficients) const override;

      /** \brief Compute all squared distances from the cloud data to a given stick model.
        * \param[in] model_coefficients the coefficients of a stick model that we need to compute distances to
        * \param[out] distances the resultant estimated squared distances
        */
      void
      getDistancesToModel (const Eigen::VectorXf &model_coefficients,
                           std::vector<double> &distances) const override;

      /** \brief Select all the points which respect the given model coefficients as inliers.
        * \param[in] model_coefficients the coefficients of a stick model that we need to compute distances to
        * \param[in] threshold a maximum admissible distance threshold for determining the inliers from the outliers
        * \param[out] inliers the resultant model inliers
        */
      void 
      selectWithinDistance (const Eigen::VectorXf &model_coefficients, 
                            const double threshold, 
                            Indices &inliers) override;

      /** \brief Count all the points which respect the given model coefficients as inliers. 
        * 
        * \param[in] model_coefficients the coefficients of a model that we need to compute distances to
        * \param[in] threshold maximum admissible distance threshold for determining the inliers from the outliers
        * \return the resultant number of inliers
        */
      std::size_t
      countWithinDistance (const Eigen::VectorXf &model_coefficients,
                           const double threshold) const override;

      /** \brief Recompute the stick coefficients using the given inlier set and return them to the user.
        * @note: these are the coefficients of the stick model after refinement (e.g. after SVD)
        * \param[in] inliers the data inliers found as supporting the model
        * \param[in] model_coefficients the initial guess for the model coefficients
        * \param[out] optimized_coefficients the resultant recomputed coefficients after optimization
        */
      void
      optimizeModelCoefficients (const Indices &inliers,
                                 const Eigen::VectorXf &model_coefficients,
                                 Eigen::VectorXf &optimized_coefficients) const override;

      /** \brief Create a new point cloud with inliers projected onto the stick model.
        * \param[in] inliers the data inliers that we want to project on the stick model
        * \param[in] model_coefficients the *normalized* coefficients of a stick model
        * \param[out] projected_points the resultant projected points
        * \param[in] copy_data_fields set to true if we need to copy the other data fields
        */
      void
      projectPoints (const Indices &inliers,
                     const Eigen::VectorXf &model_coefficients,
                     PointCloud &projected_points,
                     bool copy_data_fields = true) const override;

      /** \brief Verify whether a subset of indices verifies the given stick model coefficients.
        * \param[in] indices the data indices that need to be tested against the plane model
        * \param[in] model_coefficients the plane model coefficients
        * \param[in] threshold a maximum admissible distance threshold for determining the inliers from the outliers
        */
      bool
      doSamplesVerifyModel (const std::set<index_t> &indices,
                            const Eigen::VectorXf &model_coefficients,
                            const double threshold) const override;

      /** \brief Return a unique id for this model (SACMODEL_STICK). */
      inline pcl::SacModel 
      getModelType () const override { return (SACMODEL_STICK); }

    protected:
      using SampleConsensusModel<PointT>::sample_size_;
      using SampleConsensusModel<PointT>::model_size_;

      /** \brief Check if a sample of indices results in a good sample of points
        * indices.
        * \param[in] samples the resultant index samples
        */
      bool
      isSampleGood (const Indices &samples) const override;
  };
}

#ifdef PCL_NO_PRECOMPILE
#include <pcl/sample_consensus/impl/sac_model_stick.hpp>
#endif