/*
 *      Gem-graph OpenGL experiments
 *
 *      Desc: Base header
 *
 *  Copyright (C) 2023 Arthur Menges <arthur.menges@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/>.
 */

#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, file name
 *          contents, target ptr
 *
 * @return  void
 */
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;
}