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

// Wokwi uses a special SSID for its virtual antenna
const char* ssid = "Wokwi-GUEST";
const char* password = ""; 
const char* mqtt_server = "test.mosquitto.org";
const char* myTopic = "p5js/chat/multimode"; 

const int ledPin1 = 26; // Built-in LED on the ESP32
const int ledPin2 = 27; // Built-in LED on the ESP32

WiFiClient espClient;
PubSubClient client(espClient);

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

  WiFi.mode(WIFI_STA);
  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());
}

// This handles incoming "Chat" messages from p5.js
void callback(char* topic, byte* payload, unsigned int length) {
  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }

  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  Serial.println(message);

  // Convert to uppercase to make it case-insensitive
  message.toUpperCase();

  if (message.indexOf("!LED1 ON") != -1) {
    digitalWrite(ledPin1, HIGH);
    client.publish(myTopic, "ESP32: Virtual LED is now ON!");
  } else if (message.indexOf("!LED1 OFF") != -1) {
    digitalWrite(ledPin1, LOW);
    client.publish(myTopic, "ESP32: Virtual LED is now OFF!");
  }

    if (message.indexOf("!LED2 ON") != -1) {
    digitalWrite(ledPin2, HIGH);
    client.publish(myTopic, "ESP32: Virtual LED is now ON!");
  } else if (message.indexOf("!LED2 OFF") != -1) {
    digitalWrite(ledPin2, LOW);
    client.publish(myTopic, "ESP32: Virtual LED is now OFF!");
  }

}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a unique ID for the simulator
    String clientId = "WokwiClient-" + String(random(0xffff), HEX);
    
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      client.subscribe(myTopic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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