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

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

// HiveMQ MQTT Broker configuration
const char* mqtt_server = "e7930d3045d94ea7a5d0289eeca29194.s1.eu.hivemq.cloud";
const int mqtt_port = 8883;
const char* mqtt_user = "romi";   // Username yang telah Anda buat
const char* mqtt_password = "Romi"; // Password yang telah Anda buat

WiFiClientSecure wifiClient;
PubSubClient client(wifiClient);

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

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

  // Configure MQTT server and set callback function
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32_Client", mqtt_user, mqtt_password)) {
      Serial.println(" connected");
      // Subscribe to topics
      client.subscribe("esp32/led");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

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++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  // Control LED based on received message
  if (String(topic) == "esp32/led") {
    if (messageTemp == "ON") {
      digitalWrite(2, HIGH); // Turn LED on
    } else if (messageTemp == "OFF") {
      digitalWrite(2, LOW); // Turn LED off
    }
  }
}

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

  // Publish temperature data
  float temperature = 25.0;  // Contoh nilai suhu
  client.publish("esp32/temperature", String(temperature).c_str());
  delay(2000);
}