/*!
 * 02_2_canvas.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: 31/01/2024
 *
 */

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

#include <catch.hpp>

#include "canvas.h"

using namespace Raytracer;

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

TEST_CASE("[Canvas] Creating a canvas", "[Canvas]")
{
    Canvas c(10, 20);

    REQUIRE(c.width() == 10);
    REQUIRE(c.height() == 20);

    for (int i = 0; i < 10; ++i)
    {
        for (int j = 0; j < 20; ++j)
        {
            REQUIRE(c.pixel_at(2, 3) == Color(0, 0, 0));
        }
    }
}

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

TEST_CASE("[Canvas] Writing pixels to a canvas", "[Canvas]")
{
    Canvas c(10, 20);
    Color red(1, 0, 0);

    c.write_pixel(2, 3, red);

    REQUIRE(c.pixel_at(2, 3) == red);
}

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

TEST_CASE("[Canvas] Constructing the PPM pixel data", "[Canvas]")
{
    std::string ppm, the_ref_ppm;
    Canvas c(5, 3);
    Color c1(1.5, 0, 0);
    Color c2(0, 0.5, 0);
    Color c3(-0.5, 0, 1);

    c.write_pixel(0, 0, c1);
    c.write_pixel(2, 1, c2);
    c.write_pixel(4, 2, c3);

    ppm = c.to_ppm();

    the_ref_ppm = "P3\n5 3\n255\n";
    the_ref_ppm += "255 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n";
    the_ref_ppm += "0 0 0 0 0 0 0 128 0 0 0 0 0 0 0\n";
    the_ref_ppm += "0 0 0 0 0 0 0 0 0 0 0 0 0 0 255\n";

    REQUIRE(ppm == the_ref_ppm);
}

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

TEST_CASE("[Canvas] Split long lines in PPM files", "[Canvas]")
{
    std::string ppm, the_ref_ppm;
    Canvas c(10, 2);

    for (int j = 0; j < 2; ++j)
    {
        for (int i = 0; i < 10; ++i)
        {
            c.write_pixel(i, j, Color(1, 0.8, 0.6));
        }
    }

    ppm = c.to_ppm();

    the_ref_ppm = "P3\n10 2\n255\n";
    the_ref_ppm += "255 204 153 255 204 153 255 204 153 255 204 153 255 204 153 255 204\n";
    the_ref_ppm += "153 255 204 153 255 204 153 255 204 153 255 204 153\n";
    the_ref_ppm += "255 204 153 255 204 153 255 204 153 255 204 153 255 204 153 255 204\n";
    the_ref_ppm += "153 255 204 153 255 204 153 255 204 153 255 204 153\n";

    REQUIRE(ppm == the_ref_ppm);
}