// cs/renderer/scene.cc
#include "cs/renderer/scene.hh"

#include <limits>

#include "cs/renderer/geo/dist.hh"

bool cs::renderer::Scene::intersected_by(
    const r3 ray, p3* at_point, v3* at_normal) const {
  bool found_intersection = false;
  float min_distance = std::numeric_limits<float>::max();
  for (auto& shape : shapes_) {
    p3 this_intersection_point;
    v3 this_intersection_normal;
    if (shape->intersected_by(ray, &this_intersection_point,
                              &this_intersection_normal)) {
      float distance = cs::renderer::geo::dist(
          ray.origin, this_intersection_point);
      if (distance < min_distance) {
        found_intersection = true;
        min_distance = distance;
        *at_point = this_intersection_point;
        *at_normal = this_intersection_normal;
      }
    }
  }
  return found_intersection;
}