#include <WiFi.h>
#include "PubSubClient.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHTesp.h"
const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "VLUTE/hienthi/hienthi1";

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "";
int Port = 1883;
String dulieu = "";
WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;
const int DHT_PIN = 15;
DHTesp dhtSensor;

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#define NTP_SERVER     "pool.ntp.org"
#define UTC_OFFSET     0
#define UTC_OFFSET_DST 0


void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  LCD.setCursor(15, 1);
  LCD.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}



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.print(" connected");
      client.subscribe(MQTT_Topic);
      Serial.println("");
    } 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];
  }
  dulieu = stMessage;
  Serial.println();
  if (stMessage == "on") {
    digitalWrite(ledPin, HIGH);
  }
  else if (stMessage == "off") {
    digitalWrite(ledPin, LOW);
  }
}

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Connecting to ");
  LCD.setCursor(0, 1);
  LCD.print("hello ");
 configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
}

void loop() {
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print(dulieu);
  Serial.println((dulieu));
   TempAndHumidity  data = dhtSensor.getTempAndHumidity();
   String temp = String(data.temperature, 2);
  String humidity = String(data.humidity, 1);
   String JSONMessage = " {\"temp\": \""+temp+"\", \"humidity\": \""+humidity+"\"}";
  client.publish("VLUTE/hienthi", (char*) JSONMessage.c_str());
  delay(1000);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();
}