# Importation des bibliothèques nécessaires
from machine import Pin
import time
import dht

# Initialize LEDs and the DHT22 sensor
green_led = Pin(4, Pin.OUT)
red_led = Pin(2, Pin.OUT)
PIN_DHT = 15  # GPIO for the DHT22
sensor = dht.DHT22(Pin(PIN_DHT))

def control_led_dht(command):
    """
    Control the LEDs and read data from the DHT22 sensor based on the command.
    """
    if command.upper() == "ON":
        print("System is ON")
        red_led.off()  # Turn off the red LED
        green_led.on()  # Turn on the green LED
        return True
    else:
        # Message d'erreur pour les commandes non reconnues
        print(f"Invalid command: {command}. Please use 'ON' to start , 'Ctrl + C' to end the program ")
        return False

def read_temperature_humidity():
    """
    Read temperature and humidity data from the DHT22 sensor.
    """
    # Gérer les erreurs de lecture
    try:
        sensor.measure()# Demander une mesure au capteur
        temperature = sensor.temperature()# Lire la température
        humidity = sensor.humidity()# Lire l'humidité
        print(f"Temperature: {temperature}°C, Humidity: {humidity}%")

        # Check if the temperature is critical
        if temperature > 40 or temperature < 0:
            show_alert(f"Critical Temperature: {temperature}°C")# Afficher une alerte
        else:
            green_led.on()  # Turn off the red LED if no alert
            red_led.off()

        return temperature, humidity
    except Exception as e:
        print(f"Sensor read error: {e}")
        return None, None

def show_alert(message):
    """
    Display an alert (both on the console and the red LED).
    """
    print(f"⚠️ Alert: {message}")
    green_led.off()
    red_led.on()  # Turn on the red LED to signal an alert
    time.sleep(0.5)
    red_led.off()
    time.sleep(0.5)
    red_led.on()  # Turn on the red LED to signal an alert

def main():
    """
    Main function to start the program and continuously read sensor data.
    """
    print("Please use 'ON' to start , 'Ctrl + C' to end the program")
    
    while True:
        command = input("Enter command: ")
        
        if control_led_dht(command):  # Start the program when 'ON' is entered
            try:
                # Continuously read the sensor data until the user stops the program
                while True:
                    read_temperature_humidity()
                    time.sleep(2)  # Read every 2 seconds
            except KeyboardInterrupt:
                print("Program terminated by user with Ctrl + C.")
                green_led.off()
                red_led.off()
                break

# Run the main program
main()