import network
import time
import machine
import math
from umqtt.simple import MQTTClient

SSID = "Wokwi-GUEST"
PASSWORD = ""
MQTT_BROKER = "broker.hivemq.com"
MQTT_CLIENT_ID = "wokwi-esp32"
TOPIC_SUB = b"esp32/Hazem"
TOPIC_PUB = b"esp32/Omar"

BETA = 3950
ADC_MAX = 1023

adc = machine.ADC(machine.Pin(35))
adc.atten(machine.ADC.ATTN_11DB)
adc.width(machine.ADC.WIDTH_10BIT)
relay = machine.Pin(14, machine.Pin.OUT)

def connect_wifi():
    print("Connecting to Wi-Fi...")
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(SSID, PASSWORD)
    while not wlan.isconnected():
        time.sleep(0.1)
    print("Connected:", wlan.ifconfig())

def mqtt_callback(topic, msg):
    print("Topic:", topic, "Message:", msg)
    if topic == TOPIC_SUB:
        if msg == b'on':
            relay.value(1)
            print("LED: On")
        elif msg == b'off':
            relay.value(0)
            print("LED: Off")

def read_temperature():
        analog = adc.read()
        celsius = 1/(math.log(1/(1023. / analog - 1)) / BETA + 1.0 / 298.15) - 273.15
        print("Temperature: {:.2f} °C".format(celsius))
        time.sleep(5)
        return celsius

def main():
    connect_wifi()
    client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER)
    client.set_callback(mqtt_callback)
    client.connect()
    client.subscribe(TOPIC_SUB)
    print("MQTT connected")

    while True:
        try:
            client.check_msg()
            celsius = read_temperature()
            client.publish(TOPIC_PUB, str(celsius).encode())
            print("Temperature: {:.2f} °C".format(celsius))
        except Exception as e:
            print("Error:", e)
            time.sleep(5)

main()