/*!
 * 11_reflection_refraction.cpp
 *
 * Copyright (c) 2015-2024, NADAL Jean-Baptiste. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 *
 * @Author:  NADAL Jean-Baptiste
 * @Date: 05/03/2024
 *
 */

/*---------------------------------------------------------------------------*/

#include <catch.hpp>

#include "raytracing.h"

using namespace Raytracer;

/* ------------------------------------------------------------------------- */

SCENARIO("Reflectivity for the default material", "[features/materials.feature]")
{
    GIVEN("m <- material()")
    {
        Material m;
        THEN("m.reflective = 0.0")
        {
            REQUIRE(m.reflective() == 0);
        }
    }
}

/* ------------------------------------------------------------------------- */

SCENARIO("Precomputing the reflection vector", "[features/intersections.feature]")
{
    GIVEN("shape <- plane()")
    {
        Plane shape;
        AND_GIVEN("r <- ray(point(0, 1, -1), vector(0, -sqrt(2)/2, sqrt(2)/2))")
        {
            Ray r(Tuple::Point(0, 1, -1), Tuple::Vector(0, -sqrt(2) / 2, sqrt(2) / 2));
            AND_GIVEN("i <- intersection(sqrt(2), shape)")
            {
                Intersection i(sqrt(2), &shape);
                WHEN("comps <- prepare_computation(i, r)")
                {
                    IntersectionData comps = i.prepare_computations(r);
                    THEN("comps.reflectv = vector(0, sqrt(2) / 2, sqrt(2) / 2)")
                    {
                        REQUIRE(comps.reflectv() == Tuple::Vector(0, sqrt(2) / 2, sqrt(2) / 2));
                    }
                }
            }
        }
    }
}