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

#include "thermostat.h"

#define DELTA_LOW	1.0
#define DELTA_HIGH	1.0

void
thermostat_set(struct thermostat *th, float temp_target)
{
	if (th->st == THERMOSTAT_ON && th->temp_target == temp_target)
		return;

	th->st = THERMOSTAT_ON;
	th->temp_target = temp_target;
	th->temp_min = temp_target - DELTA_LOW;
	th->temp_max = temp_target + DELTA_HIGH;
	th->on = 1;
}

void
thermostat_off(struct thermostat *th)
{
	th->st = THERMOSTAT_OFF;
	th->on = 0;
}

int
thermostat_state(struct thermostat *th, float temp)
{
	if (th->st == THERMOSTAT_OFF)
		return 0;

	if (th->on && temp > th->temp_max)
		th->on = 0;
	else if (!th->on && temp < th->temp_min)
		th->on = 1;

	return th->on;
}