from machine import Pin, I2C
from i2c_lcd import I2cLcd
import time
from machine import UART

#uart#
uart = UART(1, baudrate=9600 , tx = Pin(17) , rx = Pin(16))
print("uart started")
# --------- Hardware 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)

# --------- Display Handling Function ---------
def show_reading(temp, hum, door):
    """
    Receives raw variables directly, formats the layout strings,
    and applies safe 16-character row padding.
    """
    # Format and pad Line 1 to exactly 16 characters
    line1 = "T:{:.1f}C H:{:.1f}%".format(temp, hum)
    lcd.move_to(0, 0)
    lcd.putstr(line1 + " " * (16 - len(line1)))
    
    # Format and pad Line 2 to exactly 16 characters
    lcd.move_to(0,1)

    if door == "OPEN_GAS":
        line2 = "Gas Leak!"
    elif door == "OPEN-PERSON":
        line2 = "O:Person Near"
    else:
        line2 = "Door closed"
    
    lcd.putstr(line2 + " " * (16 - len(line2)))
# Startup Splash
def show_waiting():
    lcd.clear()
    lcd.move_to(2, 0)
    lcd.putstr("Waiting data")
    lcd.move_to(6, 1)
    lcd.putstr("(^_^)")

show_waiting()
time.sleep(2)
#main loop#
buffer = ""
while True:
    if uart.any():
        raw_data = uart.read()

        if raw_data:
            buffer += raw_data.decode('utf-8', 'ignore')
            while "\n" in buffer:
                Line , buffer = buffer.split("\n",1)
                Line = Line.strip()
                print("Recieved:", Line)
                parts = Line.split(",")
                if len(parts) != 3:
                    continue
            
                try:
                    temp = float(parts[0])
                    hum = float(parts[1])
                    door_state = parts[2]
                except:
                    continue

                print(temp , hum , door_state)
            
                show_reading(
                temp=temp,
                hum=hum,
                door=door_state
                )
    time.sleep(0.1)