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

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

// MQTT broker settings
const char* mqttServer = "mqtt.eclipseprojects.io";
const int mqttPort = 1883;
const char* mqttTopic = "esp32/pwm";

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 13;  // GPIO13 for LED

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);

  // Connect to WiFi
  Serial.printf("🔌 Connecting to WiFi: %s", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  Serial.println("\n✅ WiFi connected");
  Serial.print("🌐 IP Address: ");
  Serial.println(WiFi.localIP());

  // Connect to MQTT broker
  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);

  while (!client.connected()) {
    Serial.print("🔄 Connecting to MQTT...");
    if (client.connect("esp32-client")) {
      Serial.println(" connected!");
      client.subscribe(mqttTopic);
    } else {
      Serial.print(" failed. State=");
      Serial.println(client.state());
      delay(2000);
    }
  }
}


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

void callback(char* topic, byte* payload, unsigned int length) {
  String message;
  for (unsigned int i = 0; i < length; i++) {
    message += (char)payload[i];
  }

  Serial.print("📩 Received on topic ");
  Serial.print(topic);
  Serial.print(": ");
  Serial.println(message);

  // Try to convert message to integer PWM value
  int pwmValue = message.toInt();

  if (pwmValue >= 0 && pwmValue <= 255) {
    ledcWrite(0, pwmValue);
    Serial.printf("💡 LED PWM set to %d\n", pwmValue);
  } else {
    Serial.println("⚠️ Unknown command");
  }
}