#include <WiFi.h>
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>

#define WIFI_SSID "Yen Yen"
#define WIFI_PASSWORD "0899832234"
#define MQTT_SERVER "2df687581b8b4218a2a2fdfc44a35f84.s1.eu.hivemq.cloud"
#define MQTT_PORT 8883
#define MQTT_USER "huyphan"
#define MQTT_PASSWORD "Huy1722001#"
#define LCD_ADDRESS 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2

WiFiClient espClient;
PubSubClient client(espClient);
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

void setup() {
  Serial.begin(115200);
  connectWiFi();
  client.setServer(MQTT_SERVER, MQTT_PORT);
  client.setCallback(callback);
  reconnect();
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
}

void connectWiFi() {
  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to Wi-Fi");
}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    if (client.connect("ESP32Client", MQTT_USER, MQTT_PASSWORD)) {
      Serial.println("Connected to MQTT broker");
      client.subscribe("dht22");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" retrying in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  String message;
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  lcd.clear();
  LCD.setCursor(0, 0);
  LCD.print("Temp: ");
  LCD.print(data.temperature, 1);
  LCD.print("C");
  LCD.setCursor(0, 1);
  LCD.print("Humidity: ");
  LCD.print(data.humidity, 1);
  LCD.print("%    ");
}