#include <DHT.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#define DHTPIN 16
#define DHTTYPE DHT22
#define LED1PIN 25
#define LED2PIN 26
#define LED3PIN 27

DHT dht(DHTPIN, DHTTYPE);

// global variables for sensor readings:
float temperature ;
float  humidity;

// counter counts the number of loop rounds
int counter;

// Wifi settings and initializations:
const char* ssid = "Wokwi-GUEST";
const char* password = "";

WiFiClientSecure wifiClient;

// MQTT settings, credentials and initializations:
const char* mqtt_server = "<yourclusterhere>.s1.eu.hivemq.cloud";
const int mqtt_port = 8883;
const char* mqtt_user = "labdevice";
const char* mqtt_password = "Itsfun1!";
const char* mqtt_client_id = "thing-petri"; // <== replace with your name
const char* topic = "smartcampus/edu/tiko/laboratory/petri/dht22"; // <== replace with your name

PubSubClient client(wifiClient);
boolean rc;

// timer delay for MQTT publishing:
const long timerDelay = 10000;

void setup() {
  
  // original initializations here ...

  // Connect WIFI:
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password, 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");

  // Set MQTT server settings:
  wifiClient.setInsecure(); // Käytä epävarmaa yhteyttä (jos SSL-varmennetta ei ole määritetty)
  client.setServer(mqtt_server, mqtt_port);

  // Connect MQTT:
  connectToMQTT();
  Serial.println("done.");

  // first line in the CSV format is a list of attribute names to be outputted:
  Serial.println("Data, Temperature, Humidity");

  counter = 1;
}
void loop() {
  // create a MQTT connection:
  if (!client.connected()) {
    connectToMQTT();
  }
  client.loop();

  // call subroutine to read observations:
  readObservations();

  // write observations to Serial (CSV) and LED pins:
  writeObservations();

  // publish lates observations to MQTT topic:
  static unsigned long lastTime = 0;
  if (millis() - lastTime > timerDelay) {
    lastTime = millis();
    publishObservations();
  }

  delay(5000); // this speeds up the simulation
  counter++;
} // end loop

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

void writeObservations() {
  // Write to LED PINS HERE
  Serial.print(counter);
  Serial.print(", ");
  // Print the values of temperature in Celsius
  Serial.print(temperature);
  Serial.print(", ");
  // print Humidity in percent
  Serial.println(humidity);
}

// (re)connect to MQTT server:
void connectToMQTT() {
  while (!client.connected()) {
    Serial.print("Connecting to MQTT...");
    if (client.connect(mqtt_client_id, mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" trying again in 5 seconds");
      delay(5000);
    }
  }
}

// publish latest observations to MQTT topic:
void publishObservations() {
  // Luo satunnaiset mittaukset
  float humidity = random(0, 100);
  float temp = random(150, 250) / 10.0;
  // construct the JSON frame to be sent:
  String payload =
    "{\"humidity\": " +
    String(humidity, 1) +
    ", \"temperature\": " +
    String(temperature, 1) + "}";
 
  // Julkaise viesti
  if (client.publish(topic, payload.c_str())) {
    Serial.println("Message sent: " + payload);
  } else {
    Serial.println("Message failed");
  }
}