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

const char* ssid = "Wokwi-GUEST";  // Change to your WiFi SSID
const char* password = "";  // No password for Wokwi-GUEST
const char* mqttServer = "broker.hivemq.com";  // MQTT broker server
const int mqttPort = 1883;  // MQTT broker port
const char* mqttUser = "";  // MQTT username, if required
const char* mqttPassword = "";  // MQTT password, if required
const char* mqttTopic = "paralysis-data";  // MQTT topic to publish data

WiFiClient espClient;
PubSubClient client(espClient);

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

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived in topic: ");
  Serial.println(topic);
  Serial.print("Message:");
  String messageTemp;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  // You can process the received message here
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client", mqttUser, mqttPassword)) {
      Serial.println("connected");
      client.subscribe(mqttTopic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);
}

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

  // Publish dummy data to the MQTT topic
  client.publish(mqttTopic, "Hello from ESP32");

  delay(10000); // Publish every 10 seconds
}