import RPi.GPIO as GPIO
import time
from machine import Pin
import utime

# Keypad setup
R1 = 28
R2 = 26
R3 = 22
R4 = 21

C1 = 20
C2 = 19
C3 = 17
C4 = 16

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)

GPIO.setup(R1, GPIO.OUT)
GPIO.setup(R2, GPIO.OUT)
GPIO.setup(R3, GPIO.OUT)
GPIO.setup(R4, GPIO.OUT)
GPIO.setup(C1, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(C2, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(C3, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(C4, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

# Define the PIR sensor input and buzzer output pins
pir_pin = Pin(18, Pin.IN)
buzzer_pin = Pin(27, Pin.OUT)
led = Pin(5, Pin.OUT)

# Define the password and a variable to store the entered password
password = "1234"
entered_password = ""
motion_detected_flag = False

# Function to activate the buzzer when motion is detected
def motion_detected(pin):
    global motion_detected_flag
    print("Motion detected!")
    buzzer_pin.on()  # Turn on the buzzer
    led.on()  # Turn on the LED
    motion_detected_flag = True
    utime.sleep(2)  # Keep the buzzer on for 2 seconds
    buzzer_pin.off()  # Turn off the buzzer
    led.off()  # Turn off the LED
    pir_pin.irq(handler=None)  # Disable motion detection until reset

# Configure the PIR sensor to trigger an interrupt on motion
pir_pin.irq(trigger=Pin.IRQ_RISING, handler=motion_detected)

def readLine(line, characters):
    global entered_password
    GPIO.output(line, GPIO.HIGH)
    if GPIO.input(C1) == 1:
        print(characters[0])
        entered_password += characters[0]
    if GPIO.input(C2) == 1:
        print(characters[1])
        entered_password += characters[1]
    if GPIO.input(C3) == 1:
        print(characters[2])
        entered_password += characters[2]
    if GPIO.input(C4) == 1:
        print(characters[3])
        entered_password += characters[3]
    GPIO.output(line, GPIO.LOW)

    # Check if the entered password matches the predefined password
    if entered_password == password:
        print("Password correct. Disabling alarm.")
        buzzer_pin.off()  # Turn off the buzzer
        led.off()  # Turn off the LED
        entered_password = ""  # Reset entered password
        pir_pin.irq(trigger=Pin.IRQ_RISING, handler=motion_detected)  # Re-enable motion detection
        motion_detected_flag = False
    elif len(entered_password) >= len(password):
        # Reset if password is incorrect or too long
        entered_password = ""

try:
    while True:
        if not motion_detected_flag:
            print("Waiting for motion...")
        # Call the readLine function for each row of the keypad
        readLine(R1, ["1", "2", "3", "A"])
        readLine(R2, ["4", "5", "6", "B"])
        readLine(R3, ["7", "8", "9", "C"])
        readLine(R4, ["*", "0", "#", "D"])
        time.sleep(0.1)

except KeyboardInterrupt:
    print("\nApplication stopped!")
    GPIO.cleanup()  # Clean up GPIO pins
    pir_pin.irq(handler=None)  # Disable the PIR interrupt
    buzzer_pin.off()  # Turn off the buzzer
    led.off()
    print("Exiting...")