from machine import Pin, I2C
import dht
import time

# I2C Setup
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=400000)
ADDR_SUHU = 0x27
ADDR_HUM  = 0x3F

# Inisialisasi Button di GPIO 13
button = Pin(13, Pin.IN, Pin.PULL_UP)

# Variabel untuk Logika Toggle
system_on = True       # Status sistem saat ini
last_button_state = 1  # Status tombol sebelumnya (1 = dilepas)

def lcd_send(addr, data, mode, backlight=True):
    # 0x08 adalah bit untuk menyalakan lampu (Backlight)
    bl_bit = 0x08 if backlight else 0x00
    
    buf = [(data & 0xF0) | mode | bl_bit, (data & 0xF0) | mode | (bl_bit | 0x04), (data & 0xF0) | mode | bl_bit]
    i2c.writeto(addr, bytes(buf))
    buf = [((data << 4) & 0xF0) | mode | bl_bit, ((data << 4) & 0xF0) | mode | (bl_bit | 0x04), ((data << 4) & 0xF0) | mode | bl_bit]
    i2c.writeto(addr, bytes(buf))

def lcd_init(addr):
    for cmd in [0x33, 0x32, 0x28, 0x0C, 0x06, 0x01]:
        lcd_send(addr, cmd, 0)
        time.sleep_ms(5)

def lcd_write(addr, line, text, backlight=True):
    cmd = 0x80 if line == 1 else 0xC0
    lcd_send(addr, cmd, 0, backlight)
    for char in text:
        lcd_send(addr, ord(char), 1, backlight)

def lcd_clear(addr, backlight=True):
    lcd_send(addr, 0x01, 0, backlight)

# Inisialisasi awal
lcd_init(ADDR_SUHU)
lcd_init(ADDR_HUM)
sensor = dht.DHT22(Pin(14))

print("Sistem Siap. Tekan tombol untuk ON/OFF.")

while True:
    current_button_state = button.value()

    # Logika Toggle: Deteksi saat tombol baru saja ditekan (dari 1 ke 0)
    if last_button_state == 1 and current_button_state == 0:
        system_on = not system_on  # Balikkan status sistem
        
        if not system_on:
            # Jika sistem dimatikan: Bersihkan layar dan matikan lampu
            lcd_clear(ADDR_SUHU, backlight=False)
            lcd_clear(ADDR_HUM, backlight=False)
            print("Sistem MATI")
        else:
            print("Sistem HIDUP")
        
        time.sleep(0.2) # Debounce (mencegah pembacaan ganda)

    last_button_state = current_button_state

    # Jalankan sensor dan LCD hanya jika system_on == True
    if system_on:
        try:
            sensor.measure()
            t = sensor.temperature()
            h = sensor.humidity()

            lcd_write(ADDR_SUHU, 1, "  MONITOR SUHU  ")
            lcd_write(ADDR_SUHU, 2, " Temp: {:.1f} C ".format(t))

            lcd_write(ADDR_HUM, 1,  " MONITOR HUMID  ")
            lcd_write(ADDR_HUM, 2,  " Hum : {:.1f} % ".format(h))

        except Exception as e:
            print("Gagal baca sensor:", e)
    
    time.sleep(0.1)