#ifndef SQL_GIS_DISTANCE_H_INCLUDED
#define SQL_GIS_DISTANCE_H_INCLUDED

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/// @file
///
/// This file declares the interface to calculate distance between two
/// geometries.

#include "sql/dd/types/spatial_reference_system.h"  // dd::Spatial_reference_system
#include "sql/gis/geometries.h"

namespace gis {

/// Computes the distance between two geometries.
///
/// Both geometries must be in the same coordinate system (Cartesian or
/// geographic), and the coordinate system of the geometries must match
/// the coordinate system of the SRID. It is the caller's responsibility
/// to guarantee this.
///
/// @param[in] srs The spatial reference system, common to both geometries.
/// @param[in] g1 First geometry.
/// @param[in] g2 Second geometry.
/// @param[out] distance The shortest distance between g1 and g2 in the SRS'
/// linear unit.
/// @param[out] is_null True if the return value is NULL.
///
///  @retval false Success.
///  @retval true An error has occurred. The error has been reported with
///  my_error().
bool distance(const dd::Spatial_reference_system *srs, const Geometry *g1,
              const Geometry *g2, double *distance, bool *is_null) noexcept;

}  // namespace gis

#endif  // SQL_GIS_DISTANCE_H_INCLUDED