/*!
 * chapitre-01_tests.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: 07/02/2021
 *
 */

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

#include <catch.hpp>

#include "tuple.h"

using namespace Raytracer;

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

TEST_CASE("a tuple with w=1.0 is a point", "[Tuple]")
{
  Tuple a(4.3, -4.2, 3.1, 1.0);

  REQUIRE(a.x() == 4.3f);
  REQUIRE(a.y() == -4.2f);
  REQUIRE(a.z() == 3.1f);
  REQUIRE(a.w() == 1.0f);

  REQUIRE(a.is_point() == true);
  REQUIRE(a.is_vector() == false);
}

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

TEST_CASE("a tuple with w=0 is a vector", "[Tuple]")
{
  Tuple a(4.3, -4.2, 3.1, 0.0);

  REQUIRE(a.x() == 4.3f);
  REQUIRE(a.y() == -4.2f);
  REQUIRE(a.z() == 3.1f);
  REQUIRE(a.w() == 0.0f);

  REQUIRE(a.is_point() == false);
}

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

TEST_CASE("Point() creates tuples with w=1", "[Tuple][Point]")
{
  Tuple p = Tuple::Point(4, -4, 3);

  REQUIRE(p == Tuple(4, -4, 3, 1));
}

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

TEST_CASE("Vector() creates tuples with w=0", "[Tuple][Vector]")
{
  Tuple v = Tuple::Vector(4, -4, 3);

  REQUIRE(v == Tuple(4, -4, 3, 0));
}

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

TEST_CASE("Adding two tuples", "[Tuple][Operations]")
{
  Tuple a1(3, -2, 5, 1);
  Tuple a2(-2, 3, 1, 0);

  REQUIRE((a1 + a2) == Tuple(1, 1, 6, 1));
}

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

TEST_CASE("Subtracting two points", "[Tuple][Operations]")
{
  Tuple p1 = Tuple::Point(3, 2, 1);
  Tuple p2 = Tuple::Point(5, 6, 7);

  REQUIRE((p1 - p2) == Tuple::Vector(-2, -4, -6));
}

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

TEST_CASE("Subtracting a vector from a point", "[Tuple][Operations]")
{
  Tuple p = Tuple::Point(3, 2, 1);
  Tuple v= Tuple::Vector(5, 6, 7);

  REQUIRE((p - v) == Tuple::Point(-2, -4, -6));
}

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

TEST_CASE("Subtracting two vectors", "[Tuple][Operations]")
{
  Tuple v1 = Tuple::Vector(3, 2, 1);
  Tuple v2 = Tuple::Vector(5, 6, 7);

  REQUIRE((v1 - v2) == Tuple::Vector(-2, -4, -6));
}

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

TEST_CASE("Subtracting a vector from the zero vector", "[Tuple][Operations]")
{
  Tuple zero = Tuple::Vector(0, 0, 0);
  Tuple v = Tuple::Vector(1, -2, 3);

  REQUIRE((zero - v) == Tuple::Vector(-1, 2, -3));
}

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

TEST_CASE("Negative a tuple", "[Tuple][Operations]")
{
  Tuple a(1, -2, 3, -4);

  REQUIRE(-a == Tuple(-1, 2, -3, 4));
}