import machine
import utime
from machine import I2C, Pin
from pico_i2c_lcd import I2cLcd  # Ensure this file is on your Pico

# 1. Setup I2C and LCD
# Adjust Pins if necessary (SDA=GP0, SCL=GP1)
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)

# Auto-detect I2C Address
devices = i2c.scan()
if not devices:
    print("No I2C LCD found!")
else:
    I2C_ADDR = devices[0]
    lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

# 2. Setup PIR Sensors
pir1 = Pin(16, Pin.IN)
pir2 = Pin(17, Pin.IN)
pir3 = Pin(18, Pin.IN)

# Initialize previous states to 0
p1_prev, p2_prev, p3_prev = 0, 0, 0

print("System Armed. Watching for intruders...")
lcd.clear()
lcd.move_to(0, 0)
lcd.putstr("SYSTEM ARMED")

def trigger_alert(top_text):
    """Helper to clear screen and display alert"""
    lcd.clear()
    lcd.move_to(0, 0)
    lcd.putstr(top_text)
    lcd.move_to(0, 1)
    lcd.putstr("  ALERT ALERT  ")
    print(f"Log: {top_text}")

while True:
    # Read current PIR values
    v1 = pir1.value()
    v2 = pir2.value()
    v3 = pir3.value()

    # Check for "Rising Edge" (Transition from 0 to 1)
    if v3 == 1 and p3_prev == 0:
        trigger_alert("ADULT DETECTED")
        
    elif v2 == 1 and p2_prev == 0:
        trigger_alert("SISTER DETECTED")
        
    elif v1 == 1 and p1_prev == 0:
        trigger_alert("CAT DETECTED")

    # Update previous states for next loop
    p1_prev, p2_prev, p3_prev = v1, v2, v3
    
    # Small delay for stability
    utime.sleep(0.1)