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

const char *WIFI_SSID = "Wokwi-GUEST";
const char *WIFI_PWD = "";

const char *MQTT_SERVER = "broker.hivemq.com";
const uint16_t MQTT_PORT = 1883;

const byte DHT_PIN = 15;

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);
DHTesp dhtSensor;

void CallbackMqtt(char* topic, byte* payload, unsigned int length)
{
  Serial.print("Callback - ");
  Serial.print("Message:");
  for (int i = 0; i < length; i++)
  {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

void SetupMqtt()
{
  mqttClient.setServer(MQTT_SERVER, MQTT_PORT);
  //set the callback function
  mqttClient.setCallback(CallbackMqtt);
}

void ConnectToMqtt()
{
  Serial.println("Connecting to MQTT Broker...");
  while (!mqttClient.Connected())
  {
    char clientId[100] = "\0";
    sprintf(clientId, "ESP32Client-%04X", random(0xffff));
    Serial.println(clientId);

    if (mqttClient.connect(clientId))
    {
      Serial.println("Connected to MQTT broker.");
      // subcribe to topic
      mqttClient.subcribe("/sensors/commands");
    }
  }
}

void ConnectToWiFi()
{
  Serial.print("Connecting to WiFi ");
  Serial.println(WIFI_SSID);

  Wifi.begin(WIFI_SSID, WIFI_PWD, 6);
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.print("\nConnected to");
  Serial.println(WIFI_SSID);
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Setup Begin");

  ConnectToWiFi();
  SetupMqtt();

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  Serial.println("Setup End");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}