#ifndef __JANGLE2D__
#define __JANGLE2D__

#include <cmath>

#include "JIO/JSerialisable.hh"


namespace JGEOMETRY2D {

  namespace {
    using JIO::JReader;
    using JIO::JWriter;
  }


  /**
   * Data structure for angle in two dimensions.
   */
  class JAngle2D {
  public:
    /**
     * Default constructor.
     */
    JAngle2D() :
      __phi(0.0)
    {}


    /**
     * Constructor.
     *
     * \param  phi      phi angle [rad]
     */
    JAngle2D(const double phi) :
      __phi(phi)
    {}


    /**
     * Read JAngle2D from input.
     *
     * \param  in         JReader
     * \param  angle      JAngle2D
     * \return            JReader
     */
    friend inline JReader& operator>>(JReader& in, JAngle2D& angle)
    {
      in >> angle.__phi;

      return in;
    }


    /**
     * Write JAngle2D to output.
     *
     * \param  out        JWriter
     * \param  angle      JAngle2D
     * \return            JWriter
     */
    friend inline JWriter& operator<<(JWriter& out, const JAngle2D& angle)
    {
      out << angle.__phi;

      return out;
    }


    /**
     * Get phi angle.
     *
     * \return          phi angle
     */
    double getPhi() const { return __phi; }


    /**
     * Get x direction.
     *
     * \return          x direction
     */
    double getDX() const { return cos(__phi); }


    /**
     * Get y direction.
     *
     * \return          y direction
     */
    double getDY() const { return sin(__phi); }


  protected:
    double __phi;
  };
}

#endif