import time
import dht
from machine import Pin, SoftI2C

# ==========================================
# CLASS DRIVER LCD I2C (STANDALONE)
# ==========================================
class LCDI2C:
    def __init__(self, i2c, addr=0x27):
        self.i2c = i2c
        self.addr = addr
        self.backlight = 0x08
        time.sleep_ms(20)
        self._write_init_nibble(0x03)
        self._write_init_nibble(0x03)
        self._write_init_nibble(0x03)
        self._write_init_nibble(0x02)
        self.cmd(0x28)
        self.cmd(0x0C)
        self.clear()

    def _write_init_nibble(self, nibble):
        byte = (nibble << 4) | self.backlight
        self.i2c.writeto(self.addr, bytes([byte | 0x04, byte]))

    def cmd(self, command):
        byte = (command & 0xF0) | self.backlight
        self.i2c.writeto(self.addr, bytes([byte | 0x04, byte]))
        byte = ((command << 4) & 0xF0) | self.backlight
        self.i2c.writeto(self.addr, bytes([byte | 0x04, byte]))

    def data(self, char_code):
        byte = (char_code & 0xF0) | self.backlight | 0x01
        self.i2c.writeto(self.addr, bytes([byte | 0x04, byte]))
        byte = ((char_code << 4) & 0xF0) | self.backlight | 0x01
        self.i2c.writeto(self.addr, bytes([byte | 0x04, byte]))

    def clear(self):
        self.cmd(0x01)
        self.cmd(0x02)
        time.sleep_ms(2)

    def move_to(self, col, row):
        addr = col & 0x3F
        if row == 1:
            addr += 0x40
        self.cmd(0x80 | addr)

    def print(self, text):
        for char in text:
            self.data(ord(char))

# ==========================================
# INISIALISASI HARDWARE ESP32
# ==========================================
DHT_PIN = 15
LED_HIJAU_PIN = 2
LED_MERAH_PIN = 4
BUZZER_PIN = 5
BATAS_SUHU = 30.0

sensor_dht = dht.DHT22(Pin(DHT_PIN))
led_hijau = Pin(LED_HIJAU_PIN, Pin.OUT)
led_merah = Pin(LED_MERAH_PIN, Pin.OUT)
buzzer = Pin(BUZZER_PIN, Pin.OUT)

# Inisialisasi Bus I2C & LCD
i2c = SoftI2C(sda=Pin(21), scl=Pin(22), freq=400000)
lcd = LCDI2C(i2c, addr=0x27)

# Tampilan Startup
lcd.clear()
lcd.move_to(0, 0)
lcd.print("Sistem Pengawas")
lcd.move_to(0, 1)
lcd.print("Suhu Ready...")
time.sleep(2)
lcd.clear()

print("--- Sistem Pengawas Suhu Siap (MicroPython) ---")

# ==========================================
# LOOP UTAMA SIMULASI
# ==========================================
while True:
    try:
        # Membaca Data DHT22
        sensor_dht.measure()
        suhu = sensor_dht.temperature()
        kelembapan = sensor_dht.humidity()

        # Baris 1 LCD: Suhu & Kelembapan
        lcd.move_to(0, 0)
        lcd.print(f"T:{suhu:.1f}C H:{int(kelembapan)}%   ")

        # Serial Monitor Output
        print(f"Suhu: {suhu:.1f} °C | Kelembapan: {kelembapan:.0f} %")

        # Logika Peringatan Ambang Suhu
        if suhu >= BATAS_SUHU:
            led_merah.value(1)
            led_hijau.value(0)
            buzzer.value(1)

            lcd.move_to(0, 1)
            lcd.print("Status: OVERHEAT!")
            print("--> PERINGATAN: Suhu tinggi terdeteksi!")
        else:
            led_merah.value(0)
            led_hijau.value(1)
            buzzer.value(0)

            lcd.move_to(0, 1)
            lcd.print("Status: Normal  ")
            print("--> Status: Suhu Normal.")

    except OSError:
        print("Gagal membaca dari sensor DHT22!")
        lcd.move_to(0, 0)
        lcd.print("Error Sensor!   ")

    print("--------------------------------")
    time.sleep(2)