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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.mqttdashboard.com";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];

const int DHT_PIN = 13;
String OldData = "";
DHTesp dhtSensor;
LiquidCrystal_I2C lcd(0x27, 16, 2);

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  lcd.init();
  lcd.backlight();
}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("topic_esp32/led");
    } 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.print(topic);
  Serial.print(". Message: ");
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();

  if (String(topic) == "topic_esp32/led") {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(String(topic));
    lcd.setCursor(0, 1);
    lcd.print("Msg: " + stMessage);    
    Serial.print("Changing output to ");
    if(stMessage == "on"){
      Serial.println("on");
      digitalWrite(ledPin, HIGH);
    }
    else if(stMessage == "off"){
      Serial.println("off");
      digitalWrite(ledPin, LOW);
    }
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    mqttReconnect();
  }
  while (true)
  {
    TempAndHumidity data = dhtSensor.getTempAndHumidity();
    //Serial.println("Temp: " + String(data.temperature, 2) + "°C");
    //Serial.println("Humidity: " + String(data.humidity, 1) + "%");
    String dataForPublishing = String(data.temperature, 2) + " " + String(data.humidity, 1);
    if(dataForPublishing != OldData){
      unsigned char* buf = new unsigned char[100];
      dataForPublishing.getBytes(buf, 100, 0);
      const char *sendMessageData = (const char*)buf;
      client.publish("topic_esp32/tempAndhum",sendMessageData);
    }
    OldData = dataForPublishing;
    client.loop();
    delay(100);
  }
}