#ifndef _EWMA_H
#define _EWMA_H

#include <math.h>
#include <stdbool.h>

/* Exponentially weighted moving average (EWMA) */

/* For more documentation see ewma.c */
struct ewma {
	long double internal;
	long double weight;
	long double weight_recip;
};

extern bool ewma_init(struct ewma *avg, long double weight);

extern struct ewma *ewma_add(struct ewma *avg, long double val);

/**
 * ewma_read() - Get average value
 * @avg: Average structure
 *
 * Returns the average value held in @avg.
 */
static inline long long int ewma_read_ll(const struct ewma *avg)
{
	return llrintl(avg->internal);
}

static inline long double ewma_read_ld(const struct ewma *avg)
{
	return avg->internal;
}

#endif