/* BSD 3-Clause License
 *
 * Copyright © 2008-2020, Jice and the libtcod contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#include "mersenne.hpp"

#include <stdlib.h>

#include "libtcod_int.h"

static TCODRandom* instance = (TCODRandom*)NULL;

TCODRandom* TCODRandom::getInstance(void) {
  if (!instance) {
    instance = new TCODRandom(TCOD_RNG_CMWC, true);
  }
  return instance;
}

TCODRandom::TCODRandom(TCOD_random_algo_t algo, bool allocate) {
  if (allocate) data = TCOD_random_new(algo);
}

TCODRandom::TCODRandom(uint32_t seed, TCOD_random_algo_t algo) { data = TCOD_random_new_from_seed(algo, seed); }

TCODRandom::~TCODRandom() { TCOD_random_delete(data); }

TCODRandom* TCODRandom::save() const {
  TCODRandom* ret = new TCODRandom(data->algo, false);
  ret->data = TCOD_random_save(data);
  return ret;
}

void TCODRandom::restore(const TCODRandom* backup) { TCOD_random_restore(data, backup->data); }
