/*
 *
 * Conky, a system monitor, based on torsmo
 *
 * Any original torsmo code is licensed under the BSD license
 *
 * All code written since the fork of torsmo is licensed under the GPL
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
 * Copyright (c) 2005-2024 Brenden Matthews, Philip Kovacs, et. al.
 *	(see AUTHORS)
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <inttypes.h>
#include <time.h>
#include "../conky.h"
#include "../content/text_object.h"
#include "../logging.h"
#include "config.h"

/* check for OS and include appropriate headers */
#if defined(__linux__)
#include "os/linux.h"
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include "os/freebsd.h"
#elif defined(__DragonFly__)
#include "os/dragonfly.h"
#elif defined(__OpenBSD__)
#include "os/openbsd.h"
#elif defined(__NetBSD__)
#include "os/netbsd.h"
#elif defined(__sun)
#include "os/solaris.h"
#elif defined(__HAIKU__)
#include "os/haiku.h"
#elif defined(__APPLE__) && defined(__MACH__)
#include "os/darwin.h"
#endif

struct _entropy {
  _entropy() = default;
  unsigned int avail{0};
  unsigned int poolsize{0};
};

static _entropy entropy;

int update_entropy() {
  get_entropy_avail(&entropy.avail);
  get_entropy_poolsize(&entropy.poolsize);
  if (entropy.poolsize == 0) {
    LOG_WARNING("entropy pool size is zero, metrics will be unavailable");
  }
  return 0;
}

void print_entropy_avail(struct text_object *obj, char *p,
                         unsigned int p_max_size) {
  (void)obj;
  snprintf(p, p_max_size, "%u", entropy.avail);
}

uint8_t entropy_percentage(struct text_object *obj) {
  (void)obj;
  return round_to_positive_int(static_cast<double>(entropy.avail) * 100.0 /
                               static_cast<double>(entropy.poolsize));
}

void print_entropy_poolsize(struct text_object *obj, char *p,
                            unsigned int p_max_size) {
  (void)obj;
  snprintf(p, p_max_size, "%u", entropy.poolsize);
}

double entropy_barval(struct text_object *obj) {
  (void)obj;

  return static_cast<double>(entropy.avail) / entropy.poolsize;
}

void print_password(struct text_object *obj, char *p, unsigned int p_max_size) {
  time_t t;
  static const char letters[] =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789~!@#$%^&*("
      ")_";
  static const int len = static_cast<int>(sizeof(letters)) - 1;
  uintmax_t x = strtoumax(obj->data.s, (char **)NULL, 10);
  uintmax_t z = 0;

  if (-1 == (t = time(NULL))) { return; }
  srandom(static_cast<unsigned int>(t));

  for (; z < x && p_max_size - 1 > z; z++) { *p++ = letters[random() % len]; }
  *p = '\0';
}
