import grovepi
import math
import time
from sensors.lock import grove_lock

# Connect the Grove Temperature & Humidity Sensor Pro to digital port D3
# This example uses the blue colored sensor.
# SIG,NC,VCC,GND
sensor = 3  # The Sensor goes on digital port 3.

# temp_humidity_sensor_type
# Grove Base Kit comes with the blue sensor.
blue = 0    # The Blue colored sensor.
white = 1   # The White colored sensor.

def get_temperature_and_humidity():
    with grove_lock:
        try:
            [temp, humidity] = grovepi.dht(sensor, blue)
            if not math.isnan(temp) and not math.isnan(humidity) and temp > -40 and humidity >= 0:
                return temp, humidity
        except Exception:
            pass
        return None, None


def get_temperature_and_humidity_with_retry(max_retries=4, retry_delay=1.5):
    """
    Reads temperature and humidity with retries.
    Uses a 1.5s delay between attempts to respect DHT sampling limits.
    """
    for attempt in range(max_retries):
        temp, humidity = get_temperature_and_humidity()
        if temp is not None and humidity is not None:
            return temp, humidity
        
        # Wait before retrying (DHT sensors require >= 1s between reads)
        if attempt < max_retries - 1:
            time.sleep(retry_delay)
            
    print("Warning: All DHT sensor read attempts failed.")
    return None, None