/*
 * Copyright (c) 2024 Mustafa Abdullah Kus, Sparse Technology
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/net/prometheus/counter.h>

#include <stdlib.h>
#include <string.h>

#include <zephyr/kernel.h>

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(pm_counter, CONFIG_PROMETHEUS_LOG_LEVEL);

int prometheus_counter_add(struct prometheus_counter *counter, uint64_t value)
{
	if (counter == NULL) {
		return -EINVAL;
	}

	counter->value += value;

	return 0;
}

int prometheus_counter_set(struct prometheus_counter *counter, uint64_t value)
{
	uint64_t old_value;

	if (counter == NULL) {
		return -EINVAL;
	}

	if (value == counter->value) {
		return 0;
	}

	old_value = counter->value;
	if (value < old_value) {
		LOG_DBG("Cannot set counter to a lower value (%" PRIu64 " < %" PRIu64 ")",
			value, old_value);
		return -EINVAL;
	}

	counter->value += (value - old_value);

	return 0;
}