import RPi.GPIO as GPIO
import glob
import time

# -----------------------------
# API-Funktionen GPIO LED Ampel
# -----------------------------

PIN_R = 17
PIN_Y = 27
PIN_G = 22

_initialized = False

def init():
    global _initialized
    if _initialized:
        return

    GPIO.setwarnings(False)
    GPIO.setmode(GPIO.BCM)

    GPIO.setup(PIN_R, GPIO.OUT)
    GPIO.setup(PIN_Y, GPIO.OUT)
    GPIO.setup(PIN_G, GPIO.OUT)

    _initialized = True


def setLED(pin, value):
    GPIO.output(pin, GPIO.HIGH if value == 1 else GPIO.LOW)


def setRedLED(value):
    setLED(PIN_R, value)


def setYellowLED(value):
    setLED(PIN_Y, value)


def setGreenLED(value):
    setLED(PIN_G, value)


def status():
    return (
        int(GPIO.input(PIN_R)),
        int(GPIO.input(PIN_Y)),
        int(GPIO.input(PIN_G)),
    )


# -----------------------------
# API-Funktionen ds18b20
# -----------------------------

SENSOR_TIMEOUT = 1

def get_sensor():
    sensors = glob.glob("/sys/bus/w1/devices/28-*")
    if not sensors:
        return None
    return sensors[0] + "/w1_slave"


def get_temperature():
    sensor_file = get_sensor()
    if sensor_file is None:
        return None

    start_time = time.time()

    while True:
        with open(sensor_file, "r") as f:
            lines = f.readlines()

        if lines[0].strip().endswith("YES"):
            break

        if time.time() - start_time > SENSOR_TIMEOUT:
            return None

        time.sleep(0.1)

    temp_line = lines[1]
    temp_str = temp_line.split("t=")[1]
    return float(temp_str) / 1000.0