from machine import Pin, PWM, I2C
from time import sleep
from i2c_lcd import I2cLcd
from keypad import Keypad

# GPIO Pin Definitions
SERVO_PIN = 23
RED_LED_PIN = 16
GREEN_LED_PIN = 17
BLUE_LED_PIN = 19
BUZZER_PIN = 2  # Make sure this pin matches your Wokwi wiring
PIR_PIN = 18
PUSHBUTTON_PIN = 4
I2C_SDA = 21
I2C_SCL = 22

# Setup LEDs, PIR Sensor, and Pushbutton
red_led = Pin(RED_LED_PIN, Pin.OUT)
green_led = Pin(GREEN_LED_PIN, Pin.OUT)
blue_led = Pin(BLUE_LED_PIN, Pin.OUT)
pir = Pin(PIR_PIN, Pin.IN)
pushbutton = Pin(PUSHBUTTON_PIN, Pin.IN, Pin.PULL_UP)  # Ensure internal pull-up is enabled

# Setup PWM Buzzer
buzzer = PWM(Pin(BUZZER_PIN))
buzzer.freq(3000)  # High-pitch sound (3kHz)
buzzer.duty(0)  # Start with buzzer OFF

# Setup Servo Motor
servo = PWM(Pin(SERVO_PIN), freq=50)
def set_servo(angle):
    duty = int((angle / 180) * 102 + 26)
    servo.duty(duty)

# Setup LCD 20x4 (I2C)
i2c = I2C(0, scl=Pin(I2C_SCL), sda=Pin(I2C_SDA), freq=400000)
lcd = I2cLcd(i2c, 0x27, 4, 20)
lcd.clear()

# Setup Keypad (4x4 Matrix)
ROWS = [13, 12, 14, 27]
COLS = [26, 25, 33, 32]
keys = [['1', '2', '3', 'A'],
        ['4', '5', '6', 'B'],
        ['7', '8', '9', 'C'],
        ['*', '0', '#', 'D']]
keypad = Keypad(ROWS, COLS, keys)

# Passcode settings
correct_passcode = "1234"
input_code = ""
is_unlocked = False

# Initialize Servo in Lock Position
set_servo(0)

def unlock_door():
    global is_unlocked
    lcd.clear()
    lcd.putstr("Access Granted")
    
    red_led.off()  # Red OFF
    green_led.on()  # Green ON (Unlocked)
    set_servo(90)  # Unlock position
    
    is_unlocked = True
    sleep(2)
    lcd.clear()

def lock_door():
    global is_unlocked
    lcd.clear()
    lcd.putstr("Door Locked")
    
    green_led.off()  # Green OFF
    red_led.on()  # Red ON (Locked)
    set_servo(0)  # Lock position
    
    is_unlocked = False
    sleep(2)
    lcd.clear()

def wrong_passcode():
    lcd.clear()
    lcd.putstr("Access Denied")
    buzzer.duty(1023)  # Loudest sound
    sleep(1)
    buzzer.duty(0)
    lcd.clear()

# Interrupt for PIR Sensor
def motion_detected(pin):
    lcd.clear()
    lcd.putstr("Motion Detected")
    buzzer.duty(1023)  # Loudest sound
    blue_led.on()
    sleep(2)
    buzzer.duty(0)
    blue_led.off()
    lcd.clear()

# Pushbutton press handler (interrupt)
def pushbutton_pressed(pin):
    global is_unlocked
    print("Pushbutton pressed!")  # Debugging line
    
    # Toggle door lock/unlock
    if is_unlocked:
        lock_door()  # Lock the door
    else:
        unlock_door()  # Unlock the door
# Attach IRQ (interrupts)
pir.irq(trigger=Pin.IRQ_RISING, handler=motion_detected)
pushbutton.irq(trigger=Pin.IRQ_FALLING, handler=pushbutton_pressed)  # Pushbutton trigger on falling edge

def warning_beep():
    buzzer.freq(3000)  # High-pitch 3kHz
    buzzer.duty(1023)  # Loudest volume
    sleep(10)          # Keep buzzing for 10 seconds
    buzzer.duty(0)     # Turn off buzzer

# Main loop for Keypad and Pushbutton checking
while True:
    # Check if any key is pressed from keypad
    key = keypad.get_key()
    
    if key:
        lcd.clear()
        lcd.putstr("Enter Code:")
        lcd.move_to(0, 1)
        input_code += key
        lcd.putstr(input_code)

        if len(input_code) == 4:
            if input_code == correct_passcode:
                unlock_door()
            else:
                wrong_passcode()
            input_code = ""

    # Auto-lock after timeout
    if is_unlocked:
        sleep(10)
        lcd.clear()
        lcd.putstr("Warning: Door Open")
        warning_beep()  # Call buzzer warning function
        lock_door()