from machine import Pin, I2C, UART
from machine_i2c_lcd import I2cLcd
import time

# i2c lcd setup
i2c = I2C(0, scl=Pin(22), sda=Pin(21))
devices = i2c.scan()
if not devices:
    raise RuntimeError("No LCD Found!")
lcd = I2cLcd(i2c, devices[0], 2, 16)

# UART 
uart = UART(1, baudrate=9600, tx=Pin(17), rx=Pin(16))

# last value tracking
last_temp = None
last_hum = None
last_door = None
last_gas = None

# displaying stuff

def show_reading(temp, hum, door):
    lcd.clear()
    if digital_gas_value == 0: 
        line_1 = ("GAS LEAK!")
        lcd.move_to(0, 0)
        lcd.putstr(line_1 + " " * (16 - len(line_1)))

        line_2 = ("TAKE ACTION NOW!")
        lcd.move_to(0, 1)
        lcd.putstr(line_2 + " " * (16 - len(line_2)))

    else: 
        lcd.clear()
        line_1 = "T:{:.1f}C H:{:.1f}%".format(temp, hum)
        lcd.move_to(0, 0)
        lcd.putstr(line_1 + " " * (16 - len(line_1)))

        line_2 = "DOOR: " + door
        lcd.move_to(0, 1)
        lcd.putstr(line_2 + " " * (16 - len(line_2)))

def show_waiting():
    lcd.clear()
    lcd.move_to(0, 0)
    lcd.putstr("Waiting for data")
    lcd.move_to(6, 1)
    lcd.putstr("(^_^)")

show_waiting()
time.sleep(2)

while True:
    if uart.any():
        line = uart.readline()

        if not line:
            continue

        try:
            text = line.decode().strip()
            print(f"Received:{text}")

            t_str, h_str, n_f, d_str, g_val = text.split(",")

            temp = float(t_str)
            hum = float(h_str)
            near_flag = bool(n_f)
            door = str(d_str)
            digital_gas_value = int(g_val)

            if (temp != last_temp or hum != last_hum or
                door != last_door or digital_gas_value != last_gas):
                show_reading(temp, hum, door)
                last_temp = temp
                last_hum = hum
                last_door = door

        except Exception as e:
            print(f"Parse Error: {e}, Data: {line}")

        time.sleep_ms(20)