/*
 *  DoRayMe - a quick and dirty Raytracer
 *  Intersect unit tests
 *
 *  Created by Manoël Trapier
 *  Copyright (c) 2020 986-Studio.
 *
 */
#include <intersect.h>
#include <sphere.h>
#include <gtest/gtest.h>


TEST(IntersectTest, Creating_an_intersect_and_do_some_check)
{
    Intersect i;

    ASSERT_EQ(i.count(), 0);

    i.add(Intersection(1.0, nullptr));
    i.add(Intersection(4.2, nullptr));

    ASSERT_EQ(i.count(), 2);

    ASSERT_EQ(i[0].t, 1.0);
    ASSERT_EQ(i[1].t, 4.2);
}

TEST(IntersectTest, An_intersection_encapsulate_t_and_object)
{
    Sphere s = Sphere();
    Intersection i = Intersection(3.5, &s);

    ASSERT_EQ(i.t, 3.5);
    ASSERT_EQ(i.object, (Object *)&s);
}

TEST(IntersectTest, Aggregating_intersections)
{
    Sphere s = Sphere();
    Intersection i1 = Intersection(1, &s);
    Intersection i2 = Intersection(2, &s);

    Intersect xs = Intersect();
    xs.add(i1);
    xs.add(i2);

    ASSERT_EQ(xs.count(), 2);
    ASSERT_EQ(xs[0].t, 1);
    ASSERT_EQ(xs[1].t, 2);
}

TEST(IntersectTest, Intersect_sets_the_object_on_the_intersection)
{
    Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
    Sphere s = Sphere();
    Intersect xs = s.intersect(r);

    ASSERT_EQ(xs.count(), 2);
    ASSERT_EQ(xs[0].object, (Object *)&s);
    ASSERT_EQ(xs[1].object, (Object *)&s);
}