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

// Wokwi WiFi - works in simulation
const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* mqtt_server = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2;
bool ledState = false;

void setup_wifi() {
  delay(10);
  Serial.println("Connecting to WiFi...");
  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 on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  
  String messageTemp;
  for (int i = 0; i < length; i++) {
    messageTemp += (char)message[i];
  }
  Serial.println(messageTemp);

  // Check if message is for LED control
  if (String(topic) == "wokwi/led/control") {
    Serial.print("Changing LED to ");
    if(messageTemp == "ON"){
      digitalWrite(ledPin, HIGH);
      ledState = true;
      Serial.println("ON");
      client.publish("wokwi/led/status", "ON");
    }
    else if(messageTemp == "OFF"){
      digitalWrite(ledPin, LOW);
      ledState = false;
      Serial.println("OFF");
      client.publish("wokwi/led/status", "OFF");
    }
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "WokwiClient-";
    clientId += String(random(0xffff), HEX);
    
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Subscribe to control topic
      client.subscribe("wokwi/led/control");
      // Publish connected message
      client.publish("wokwi/led/status", "connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  
  Serial.begin(115200);
  setup_wifi();
  
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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

  // Add a small delay
  delay(100);
}