#include <stdbool.h>
#include <stdio.h>

#include "rays.h"
#include "runner.h"
#include "transformations.h"

static bool rays_test_0(const char ** scenario)
{
  *scenario = "Creating and querying a ray";

  struct tuple origin = point(1.0f, 2.0f, 3.0f);
  struct tuple direction = vector(4.0f, 5.0f, 6.0f);
  struct ray r = ray(origin, direction);

  return
    tuple_equal(r.origin, origin) &&
    tuple_equal(r.direction, direction);
}

static bool rays_test_1(const char ** scenario)
{
  *scenario = "Computing a point from a distance";

  struct ray r = ray(point(2.0f, 3.0f, 4.0f), vector(1.0f, 0.0f, 0.0f));

  return
    tuple_equal(ray_position(r,  0.0f), point(2.0f, 3.0f, 4.0f)) &&
    tuple_equal(ray_position(r,  1.0f), point(3.0f, 3.0f, 4.0f)) &&
    tuple_equal(ray_position(r, -1.0f), point(1.0f, 3.0f, 4.0f)) &&
    tuple_equal(ray_position(r,  2.5f), point(4.5f, 3.0f, 4.0f));
}


static bool rays_test_2(const char ** scenario)
{
  *scenario = "Translating a ray";

  struct ray r = ray(point(1.0f, 2.0f, 3.0f), vector(0.0f, 1.0f, 0.0f));
  struct mat4x4 m = translation(3.0f, 4.0f, 5.0f);
  struct ray r2 = ray_transform(r, &m);

  return
    tuple_equal(r2.origin, point(4.0f, 6.0f, 8.0f)) &&
    tuple_equal(r2.direction, vector(0.0f, 1.0f, 0.0f));
}

static bool rays_test_3(const char ** scenario)
{
  *scenario = "Scaling a ray";

  struct ray r = ray(point(1.0f, 2.0f, 3.0f), vector(0.0f, 1.0f, 0.0f));
  struct mat4x4 m = scaling(2.0f, 3.0f, 4.0f);
  struct ray r2 = ray_transform(r, &m);

  return
    tuple_equal(r2.origin, point(2.0f, 6.0f, 12.0f)) &&
    tuple_equal(r2.direction, vector(0.0f, 3.0f, 0.0f));
}

test_t rays_tests[] = {
  rays_test_0,
  rays_test_1,
  rays_test_2,
  rays_test_3,
};

RUNNER(rays_tests);