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

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT broker details
const char* mqtt_broker = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* topic = "/emohtrams9191/living";

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2; // GPIO pin for built-in LED

void setup() {
  Serial.begin(115200);

  // Setup LED pin
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);

  // Connect to WiFi
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" connected.");

  // Setup MQTT
  client.setServer(mqtt_broker, mqtt_port);
  client.setCallback(mqttCallback);

  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println(" connected.");
    } else {
      Serial.print(" failed, rc=");
      Serial.print(client.state());
      Serial.println(" trying again in 5 seconds.");
      delay(5000);
    }
  }

  // Subscribe to topic
  client.subscribe(topic);
  Serial.println("Subscribed to topic");
}

void mqttCallback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);

  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.println("Message: " + message);

  if (message == "1") {
    digitalWrite(ledPin, HIGH);
    Serial.println("LED turned ON");
  }
  if (message == "0") {
    digitalWrite(ledPin, LOW);
    Serial.println("LED turned OFF");
  } 
}

void loop() {
  client.loop();
}