#ifndef GIS__LENGTH_FUNCTOR_H_INCLUDED
#define GIS__LENGTH_FUNCTOR_H_INCLUDED

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/// @file
///
/// This file declares the length functor interface.
///
/// The functor is not intended for use directly by MySQL code. It should be
/// used indirectly through the gis::length() function.
///
/// @see gis::length

#include <memory>  // std::unique_ptr

#include <boost/geometry.hpp>
#include "sql/gis/functor.h"
#include "sql/gis/geometries.h"

namespace gis {

/// Length functor that calls Boost.Geometry with the correct parameter types.
///
/// The functor throws exceptions and is therefore only intended used to
/// implement length or other geographic functions. It should not be used
/// directly by other MySQL code.
class Length : public Unary_functor<double> {
 private:
  std::unique_ptr<boost::geometry::strategy::distance::andoyer<
      boost::geometry::srs::spheroid<double>>>
      m_geographic_strategy;

 public:
  Length(double major, double minor);
  double operator()(const Geometry &g1) const override;

  double eval(const Geometry &g1) const;

  double eval(const Geographic_linestring &g1) const;
  double eval(const Cartesian_linestring &g1) const;

  double eval(const Geographic_multilinestring &g1) const;
  double eval(const Cartesian_multilinestring &g1) const;
};

}  // namespace gis

#endif  // GIS__LENGTH_FUNCTOR_H_INCLUDED