/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527     */
/* without consent of either the College of William & Mary or     */
/* Pieter Peers.                                                  */
/******************************************************************/
#ifndef _AREALIGHTSOURCE_H_
#define _AREALIGHTSOURCE_H_

#include <memory>
#include "lightsource_base.h"
#include "boundedPrimitive.h"
#include "intersectionPoint.h"

class areaLightsource : public lightsource_base {
 public:
  //////////////////
  // Constructors //
  //////////////////
  areaLightsource(const color& power=color(1.0f, 1.0f, 1.0f), const std::shared_ptr<const boundedPrimitive>& geometry=nullptr, const vec3d& attenuation=vec3d(0.0f, 0.0f, 1.0f));
  areaLightsource(const areaLightsource&) = delete;

  ///////////////
  // Operators //
  ///////////////
  areaLightsource& operator=(const areaLightsource&) = delete;

  /////////////
  // Methods //
  /////////////
  virtual lightSample intensityAt(const vec3d& point) const override;
  virtual lightSample emittanceAt(const vec3d& point, float r1, float r2) const override;

  /////////////
  // Friends //
  /////////////
  friend std::ostream& operator<<(std::ostream& s, const areaLightsource& d)
  {
    d._print(s);
    return s;
  }

 protected:
  //////////////////////
  // Protected Method //
  //////////////////////
  virtual color _emittance(const intersectionPoint& ip) const final override;

 private:
  /////////////////////
  // Private Methods //
  /////////////////////
  virtual void _print(std::ostream& s) const override;

 private:
  //////////////////
  // Data Members //
  //////////////////
  vec3d _center;
  vec3d _attenuation;
  color _power;
  float _area;
  std::shared_ptr<const boundedPrimitive> _geometry;
};

#endif /* _AREALIGHTSOURCE_H_ */