from machine import Pin
from time import sleep

# Power Plant Earthquake Emergency Shutdown System
# Wokwi Raspberry Pi Pico version

# Button = Control Board
button = Pin(21, Pin.IN, Pin.PULL_DOWN)

# LEDs = Emergency Board
red_led = Pin(20, Pin.OUT)     # Alarm LED
green_led = Pin(19, Pin.OUT)   # Normal/OK LED

# This simulates the MongoDB/mLab cloud document:
# Original lab document: {"alarm": false}
alarm_database = {
    "alarm": False
}

previous_button_state = button.value()

print("Power Plant Earthquake Emergency Shutdown System started")
print("Wokwi version: MongoDB is simulated using a local JSON dictionary")
print("Press the button to trigger the alarm")

while True:
    # CONTROL BOARD LOGIC
    # Read the button state
    button_state = button.value()

    # If button state changes, update the simulated database
    if button_state != previous_button_state:
        alarm_database["alarm"] = True if button_state == 1 else False
        print("Control Board updated database:", alarm_database)
        previous_button_state = button_state

    # EMERGENCY BOARD LOGIC
    # Read the alarm value from the simulated database
    alarm = alarm_database["alarm"]

    if alarm:
        red_led.value(1)
        green_led.value(0)
        print("Emergency Board reads alarm=True: RUN RUN RUN")
    else:
        red_led.value(0)
        green_led.value(1)
        print("Emergency Board reads alarm=False: OK")

    sleep(1)