#pragma once
#ifndef LIGHT_HPP
#define LIGHT_HPP

#include <glm/vec3.hpp>

#include "material.hpp"
#include "ray.hpp"

using glm::vec3;

class Light {
public:
  typedef enum LIGHT_TYPE { INFINITESIMAL = 0, AREA } ltype_t;

  vec3 m_position;
  vec3 m_diffuse;
  vec3 m_specular;

  Light(): m_position(vec3(0.0f)), m_diffuse(vec3(1.0f)), m_specular(vec3(1.0f)) { }

  Light(vec3 _p, vec3 _d, vec3 _s): m_position(_p), m_diffuse(_d), m_specular(_s) { }
  
  virtual ~Light() { }

  virtual ltype_t light_type() {
    return type;
  }
  
  virtual vec3 direction(vec3 point) = 0;
  virtual float distance(vec3 point) = 0;
  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;

protected:
  ltype_t type;
};

class InfinitesimalLight: public Light {
public:
  InfinitesimalLight(): Light() {
    type = INFINITESIMAL;
  }
  
  InfinitesimalLight(vec3 _p, vec3 _d, vec3 _s): Light(_p, _d, _s) {
    type = INFINITESIMAL;
  }
  
  virtual vec3 direction(vec3 point) = 0;
  virtual float distance(vec3 point) = 0;
  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
};

class AreaLight: public Light {
public:
  AreaLight(): Light() {
    type = AREA;
  }

  AreaLight(vec3 _p, vec3 _d, vec3 _s): Light(_p, _d, _s) {
    type = AREA;
  }
  
  virtual vec3 direction(vec3 point) = 0;
  virtual float distance(vec3 point) = 0;
  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const = 0;
};

#endif