/*
 * Copyright (c) 2018 IOTA Stiftung
 * https://github.com/iotaledger/iota_common
 *
 * Refer to the LICENSE file for licensing information
 */

#ifndef __UTILS_HANDLES_RAND_H__
#define __UTILS_HANDLES_RAND_H__

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Initializes random number generation with a seed
 *
 * @param[in] seed The seed value
 */
static inline void rand_handle_seed(unsigned int seed) { srand(seed); }

/**
 * Generates a random number
 *
 * @return a random number
 */
static inline int rand_handle_rand() { return rand(); }

/**
 * Generates a random probability in [0;1]
 *
 * @return a random probability
 */
static inline double rand_handle_probability() {
  return ((double)rand_handle_rand() / (double)((unsigned)RAND_MAX + 1));
}

/**
 * Generates a random number in the interval [lower;upper[
 *
 * @param lower The lower bound
 * @param upper The upper bound
 *
 * @return a random number in the interval
 */
static inline int rand_handle_rand_interval(size_t lower, size_t upper) {
  return lower + rand_handle_probability() * upper;
}

#ifdef __cplusplus
}
#endif

#endif  // __UTILS_HANDLES_RAND_H__