#ifndef RTWEEKEND_H
#define RTWEEKEND_H

#include <math.h>
#include <memory>

/* Utility functions */
double degrees_to_radians(double d)
{
    return d * M_PI / 180;
}

/* Returns a double in the range [0,1) */
inline double random_double()
{
    return rand() * (1.0 / RAND_MAX);
}

/* Returns a double in the range [min,max) */
inline double random_double(double min, double max)
{
    return min + (max-min) * random_double();
}

/* Clamps a value between [min,max] */
inline double clamp(double v, double min, double max)
{
    return v < min ? min : v > max ? max : v;
}

/* Common internal headers */

#include "ray.hpp"
#include "vec3.hpp"

struct material;

/* Common data structures */

struct hit_record {
    point3 p;
    vec3 normal;
    std::shared_ptr<material> mat_ptr;
    double t;
    bool front_face;

    inline void set_face_normal(const ray& r, const vec3& outward_normal)
    {
        front_face = dot(r.direction, outward_normal) < 0;
        normal = front_face ? outward_normal : -outward_normal;
    }    
};




#endif