#ifndef SPHERE_H
#define SPHERE_H

#include <cmath>
#include <memory>

#include "hittable.h"
#include "material.h"
#include "vec3.h"
#include "util.h"

class Sphere : public Hittable {
public:
  Sphere() {}
  Sphere(Point3 cen, double r, std::shared_ptr<Material> m) : center(cen), radius(r), mat_ptr(m) {}

  virtual bool hit(const Ray& r, double tmin, double tmax, hit_record& rec) const;
  virtual bool bounding_box(double t0, double t1, Aabb& output_box) const;

private:
  Point3 center;
  double radius;
  std::shared_ptr<Material> mat_ptr;
};

inline void compute_sphere_uv(const Vec3& p, double& u, double& v) {
    auto phi = std::atan2(p.z(), p.x());
    auto theta = asin(p.y());
    u = 1 - (phi + pi) / (2 * pi);
    v = (theta + pi/2) / pi;
}

#endif // SPHERE_H