/*
 *      Gem-graph
 *
 *      Desc: OpenGL grid functions
 *
 *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
 *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
 *
 *  This file is part of Gem-graph.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <time.h>
#include "../../include/base.h"
#include "../../include/ui.h"
#include "../../include/graphics.h"

int draw_space_ridges_vertex (const int stack_id,
                              long offset_vertex,
                              long x,
                              long y,
                              long z)
{
    GLfloat max = fmax(x, y);  max = fmax(max, z);

    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex - y / max, - z / max);

    graphics_draw_vertex (stack_id, offset_vertex + x / max, offset_vertex - y / max, - z / max);
    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex + y / max, - z / max);
    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex - y / max, + z / max);

    graphics_draw_vertex (stack_id, offset_vertex + x / max, offset_vertex + y / max, - z / max);
    graphics_draw_vertex (stack_id, offset_vertex + x / max, offset_vertex - y / max, + z / max);
    graphics_draw_vertex (stack_id, offset_vertex - x / max, offset_vertex + y / max, + z / max);

    graphics_draw_vertex (stack_id, offset_vertex + x / max, + y / max, + z / max);

    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);
    graphics_draw_color (stack_id, 0.8f, 0.6f, 0.5f);

    return 8;
}

int draw_space_ridges_lines (const int stack_id)
{
    graphics_draw_line (stack_id, 0, 1); graphics_draw_line (stack_id, 7, 4);
    graphics_draw_line (stack_id, 0, 2); graphics_draw_line (stack_id, 7, 5);
    graphics_draw_line (stack_id, 0, 3); graphics_draw_line (stack_id, 7, 6);

    graphics_draw_line (stack_id, 1, 4); graphics_draw_line (stack_id, 2, 4);
    graphics_draw_line (stack_id, 1, 5); graphics_draw_line (stack_id, 3, 5);
    graphics_draw_line (stack_id, 2, 6); graphics_draw_line (stack_id, 3, 6);

    return 12;
}

long draw_grids_on_space_faces_vertex (const int stack_id,
                                       long x,
                                       long y,
                                       long z)
{
    float i, max = fmax(x, y); max = fmax(max, z);

    for (i = 1; i < x; i++) {

        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max, - y / max, - z / max);
        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max, - y / max,   z / max);
        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max,   y / max,   z / max);
        graphics_draw_vertex (stack_id, (2 * i / x - 1) * x / max,   y / max, - z / max);

        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
    }

    /* offset_vertex += (x - 1) * 4;     */ /* offset_colors += (x - 1) * 4; */

    for (i = 1; i < y; i++) {

        graphics_draw_vertex (stack_id, - x / max, (2 * i / y - 1) * y / max, - z / max);
        graphics_draw_vertex (stack_id, - x / max, (2 * i / y - 1) * y / max,   z / max);
        graphics_draw_vertex (stack_id, x / max, (2 * i / y - 1) * y / max,   z / max);
        graphics_draw_vertex (stack_id, x / max, (2 * i / y - 1) * y / max, - z / max);

        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
    }

    /* offset_vertex += (y - 1) * 4;     */ /* offset_colors += (y - 1) * 4; */

    for (i = 1; i < z; i++) {

        graphics_draw_vertex (stack_id, - x / max, - y / max, (2 * i / z - 1) * z / max);
        graphics_draw_vertex (stack_id, - x / max,   y / max, (2 * i / z - 1) * z / max);
        graphics_draw_vertex (stack_id, x / max,   y / max, (2 * i / z - 1) * z / max);
        graphics_draw_vertex (stack_id, x / max, - y / max, (2 * i / z - 1) * z / max);

        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
        graphics_draw_color (stack_id, 0.55f, 0.55f, 0.55f);
    }

    return (x + y + z - 3) * 3;
}


long draw_grids_on_space_faces_lines (const int stack_id,
                                      long offset_vertex,
                                      long x,
                                      long y,
                                      long z)
{
    offset_vertex = offset_vertex / 3;

    for (int i = 0; i < x - 1; i ++) {

            graphics_draw_line (stack_id, offset_vertex + i * 4 + 1,  offset_vertex + i * 4 + 2);
            graphics_draw_line (stack_id, offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
    }

    offset_vertex += (x - 1) * 4;

    for (int i = 0; i < y - 1; i ++) {

            graphics_draw_line (stack_id, offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
            graphics_draw_line (stack_id, offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
    }

    offset_vertex += (y - 1) * 4;

    for (int i = 0; i < z - 1; i ++) {

            graphics_draw_line (stack_id, offset_vertex + i * 4 + 0,  offset_vertex + i * 4 + 1);
            graphics_draw_line (stack_id, offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
    }

    return (x + y + z - 3) * 4;
}