/*
 * sample-header.c: the definitions behind sample-header.h.
 * Free sample from 99helpers.com/file-types/h
 *
 * Compiled once, then linked into each program that includes the header:
 *     cc -Wall -Wextra -std=c17 -c sample-header.c    (makes sample-header.o)
 */

/* Including its own header first lets the compiler check that every
 * definition below matches its declaration. Quotes, not angle brackets:
 * search next to this file before the system folders. */
#include "sample-header.h"

/* The one definition of the variable that the header declares extern. */
const char stats_library_name[] = "99helpers sample stats " STATS_VERSION;

void stats_init(stats_t *s)
{
    s->count = 0;
}

bool stats_add(stats_t *s, double value)
{
    if (s->count >= STATS_MAX_VALUES) {
        return false;
    }
    s->values[s->count++] = value;
    return true;
}

double stats_mean(const stats_t *s)
{
    double sum = 0.0;
    for (size_t i = 0; i < s->count; i++) {
        sum += s->values[i];
    }
    return s->count > 0 ? sum / (double)s->count : 0.0;
}

double stats_min(const stats_t *s)
{
    double min = s->count > 0 ? s->values[0] : 0.0;
    for (size_t i = 1; i < s->count; i++) {
        if (s->values[i] < min) {
            min = s->values[i];
        }
    }
    return min;
}

double stats_max(const stats_t *s)
{
    double max = s->count > 0 ? s->values[0] : 0.0;
    for (size_t i = 1; i < s->count; i++) {
        if (s->values[i] > max) {
            max = s->values[i];
        }
    }
    return max;
}