#include <Wire.h>
#include <WiFi.h>
#include <PubSubClient.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

#define DHT_PIN 15
#define DHT_TYPE DHT22

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
WiFiClient espClient;
PubSubClient client(espClient);
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttBroker = "broker.mqttdashboard.com";
const char* mqttClientId = "ESP32-Weather";
const char* mqttTopic = "wokwi-weather";

DHT dht(DHT_PIN, DHT_TYPE);

void connectToWiFi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
  Serial.println("WiFi connected");
}

void connectToMQTT() {
  client.setServer(mqttBroker, 1883);
  while (!client.connected()) {
    if (client.connect(mqttClientId)) {
      Serial.println("MQTT connected");
    } else {
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  connectToWiFi();
  timeClient.begin();
  dht.begin();

  LCD.init();
  LCD.backlight();
  LCD.print("Online");

  connectToMQTT();
}

void publishWeather() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  String weatherInfo = "T:" + String(temperature) + "C, H:" + String(humidity) + "%";
  client.publish(mqttTopic, weatherInfo.c_str());
}

void displayTimeAndWeather() {
  timeClient.update();
  LCD.setCursor(0, 0);
  LCD.print(timeClient.getFormattedTime());

  publishWeather();

  LCD.setCursor(0, 1);
  LCD.print("T:" + String(dht.readTemperature()) + "C, H:" + String(dht.readHumidity()) + "%");
}

void loop() {
  displayTimeAndWeather();
  delay(5000); // Adjust timing according to your requirement
}