/* Copyright (c) 2025 Rodrigo Arias Mallo <rodarima@gmail.com>
 * SPDX-License-Identifier: GPL-3.0-or-later */

#include "overheat.h"
#include <string.h>

void
overheat_init(struct overheat *o)
{
	memset(o, 0, sizeof(struct overheat));
}

void
overheat_input(struct overheat *o, unsigned long t_ms, float temp)
{
	unsigned long delta = t_ms - o->last_time;

	if (delta < OVH_INTERVAL)
		return;

	o->temp[o->next++] = temp;
	if (o->next >= OVH_NSAMPLES)
		o->next = 0;
	if (o->n < OVH_NSAMPLES)
		o->n++;

	/* Recompute state */
	float tmin = 10000.0, tmax = 0.0;
	for (int i = 0; i < o->n; i++) {
		if (o->temp[i] < tmin)
			tmin = o->temp[i];
		if (o->temp[i] > tmax)
			tmax = o->temp[i];
	}

	o->delta = tmax - tmin;
}

float
overheat_delta(struct overheat *o)
{
	return o->delta;
}

int
overheat_panic(struct overheat *o)
{
	if (o->delta > OVH_THRESHOLD)
		return 1;
	else
		return 0;
}