#pragma once
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#include <stdbool.h>
#include <string.h>

typedef unsigned int energy_t;

/**
 * circular energy buffer
 * beat tracking is performed by aggregating
 * values in the buffer and comparing them with the
 * current sampled energy
 * - multiple ways (avg, variance) => beat_track.c
 */
typedef struct cebuffer
{
    energy_t* buffer;     // data buffer
    int capacity;  // maximum number of items in the buffer
    int count;     // number of items in the buffer
    int head;       // pointer to head
    int tail;       // pointer to tail
} cebuffer;

void cb_init(cebuffer *cb, const int capacity);
void cb_free(cebuffer *cb);
void cb_push_back(cebuffer *cb, const energy_t item);
bool cb_beat(cebuffer *cb, const energy_t item, energy_t* energyThreshold);