import time
from umqtt.simple import MQTTClient
from machine import Pin

# MQTT Settings
MQTT_BROKER = "broker.hivemq.com"
MQTT_TOPIC_SOS = "alert/SOS"
MQTT_TOPIC_UNAUTHORIZED = "alert/unauthorized"
MQTT_TOPIC_MOVE = "move/robot"

# Setup MQTT client
client = MQTTClient("parking_system", MQTT_BROKER)
client.connect()

# Setup Button and LED for simulation
button_sos = Pin(2, Pin.IN)          # Button for SOS alert
button_unauthorized = Pin(3, Pin.IN) # Button for Unauthorized alert
led = Pin(4, Pin.OUT)                # LED to visualize actions

def send_sos_alert():
    client.publish(MQTT_TOPIC_SOS, "SOS alert at location (2,3)")
    print("SOS alert sent.")

def send_unauthorized_alert():
    client.publish(MQTT_TOPIC_UNAUTHORIZED, "Unauthorized access at location (1,1)")
    print("Unauthorized access alert sent.")

def send_move_command(x, y):
    move_message = f"Move to ({x},{y})"
    client.publish(MQTT_TOPIC_MOVE, move_message)
    print("Move command sent:", move_message)

# Main loop for the Parking System
while True:
    if button_sos.value() == 0:  # SOS alert triggered by button press
        led.value(1)
        send_sos_alert()
        time.sleep(1)
        led.value(0)
    
    if button_unauthorized.value() == 0:  # Unauthorized alert triggered by button press
        led.value(1)
        send_unauthorized_alert()
        time.sleep(1)
        led.value(0)
    
    # Example: Send a move command to nurse robot periodically
    send_move_command(2, 3)
    time.sleep(10)  # Wait for 10 seconds before sending another move command