/*
 * @file
 *
 * Gem-graph main file
 *
 * Gem-graph OpenGL experiments
 *
 * Desc: Base header
 *
 * This file is part of Gem-graph.
 *
 * @cond LICENSE
 * Copyright © 2021 Libre en Communs <contact@a-lec.org>
 * Copyright © 2021-2024 Adrien Bourmault <neox@a-lec.org>
 * Copyright © 2021-2024 Jean Sirmai <jean@a-lec.org>
 *
 * 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/>.
 * @endcond
 */

#pragma once
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <glib-2.0/glib.h>
//#define G_APPLICATION_DEFAULT_FLAGS 0

enum { X_AXIS, Y_AXIS, Z_AXIS,    N_AXIS };     //     < used by :   graph_area.h
enum { HOME_MODE, RUN_MODE, EDIT_MODE, PRESENTATION_MODE,    N_MODE };  // Gem-graph modes
struct arrow_t { uint load; uint site; uint x; uint y; uint z; }; // describes an arrow
static inline char *read_file(char *filename);  //     < used by :   init.c

/* I'm standing on Earth (or any spinning spheroid) and looking towards its North pole, then :
      X - X   =   EAST   - WEST    =   rouge - cyan
      Y - Y   =   ZENITH - NADIR   =   vert  - magenta (fuschia)
      Z - Z   =   NORTH  - SOUTH   =   bleu  - jaune                                        */

#define EAST   0 // + x  rouge
#define WEST   1 // - x  cyan
#define ZENITH 2 // + y  vert
#define NADIR  3 // - y  magenta
#define SOUTH  4 // + z  bleu
#define NORTH  5 // - z  jaune


/*
 * char *read_file(char *filename)  reads a file from filename into a provided buffer
 *
 * @param   filename
 *
 * @return  contents
 */
static inline char *read_file(char *filename)
{
    int fd;
    int filesize;
    char *contents;

    fd = open(filename, O_RDONLY);
    if(fd < 0) {
        printf("Couldn't read file: %s\n",filename);
        return NULL;
    }

    filesize = lseek(fd, 0, SEEK_END) + 1 ;
    contents = g_malloc(filesize * sizeof(char));
    assert (contents);

    lseek(fd, 0, SEEK_SET);
    read(fd,contents,filesize);

    contents[filesize-1] = '\0';

    close(fd);

    return contents;
}