/******************************************************************/
/* 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 _LIGHTSOURCE_BASE_H_
#define _LIGHTSOURCE_BASE_H_

#include <ostream>

#include "vec3d.h"
#include "lightSample.h"

class lightsource_base {
 public:
  //////////////////
  // Constructors //
  //////////////////
  lightsource_base(void) {}
  lightsource_base(const lightsource_base&) = delete;

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

  /////////////
  // Methods //
  /////////////
  virtual lightSample intensityAt(const vec3d& point) const = 0;

  virtual lightSample emittanceAt(const vec3d& point, float r1, float r2) const = 0;

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


 protected:
  //////////////////
  // Friend class //
  //////////////////
  friend class lightsourceShader;

  ///////////////////////
  // Protected Methods //
  ///////////////////////
  virtual color _emittance(const class intersectionPoint& ip) const { return color(); }

 private:
  /////////////////////
  // Private Methods //
  /////////////////////
  virtual void _print(std::ostream& s) const = 0;
};

#endif /* _LIGHTSOURCE_BASE_H_ */