#include <WiFi.h>
#include <PubSubClient.h>
#include "MQ135.h"
#include "DHT.h"

const char* mqtt_server = "broker.emqx.io";

#define PIN_MQ135 32
#define DHTPIN 27
#define DHTTYPE DHT22

MQ135 mq135_sensor = MQ135(PIN_MQ135);
DHT dht(DHTPIN, DHTTYPE);

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32Client")) {
      // Do nothing
    } else {
      delay(5000);
    }
  }
}

void setup() {
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  dht.begin();
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  float humi = dht.readHumidity();
  float tempC = dht.readTemperature();
  float ppm = mq135_sensor.getCorrectedPPM(tempC, humi);

  char msg[150];
  snprintf (msg, 150, "PPM: %.2f, Humidity: %.2f%%, Temperature: %.2f°C", ppm, humi, tempC);
  client.publish("IoT", msg);
  delay(3000);
}