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

LiquidCrystal_I2C lcd(0x27, 16, 2);

DHT dht(16, DHT22);
float temperature;
float humidity;

const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "pt/nhietdo";
const char * MQTT_Topic1 = "pt/doam";
const char * LED_Control_Topic = "VLUTE/DHT";

const char * MQTT_ID = "mqttx_7e7c4ab4";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected");
  Serial.print(", IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.println(" connected");
      //để nhận dữ liệu từ web
      //client.subscribe(LED_Control_Topic); // Đăng ký chủ đề nhận dữ liệu từ web
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String stMessage;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
}


void setup() {
  Serial.begin(9600);

  dht.begin();
  WIFIConnect();
  lcd.init();
  lcd.backlight();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
}

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

  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();

  String a = String(temperature);
  String b = String(humidity);
  Serial.println("Nhiệt độ: ");
  Serial.println(temperature);
  Serial.println("Độ ẩm: ");
  Serial.println(humidity);

  lcd.setCursor(0, 0);
  lcd.print("ND:");
  lcd.setCursor(5, 0);
  lcd.print(temperature);
  lcd.setCursor(0, 1);
  lcd.print("DA:");
  lcd.setCursor(5, 1);
  lcd.print(humidity);

  // String c = String(avg_temp);
  // String maxx = String(Max_ht);
  // String minn = String(Min_ht);
  client.publish(MQTT_Topic, a.c_str());
  client.publish(MQTT_Topic1, b.c_str());
  delay(1000);

//Hien Thi lcd

}