#if defined(ESP8266)
#include <ESP8266WiFi.h>
#include <FirebaseESP8266.h>

#define FIREBASE_HOST "https://iotmobile-f7eea-default-rtdb.firebaseio.com/"
#define FIREBASE_AUTH "AIzaSyBN1dXcPV5WhOe1EYp-Zv8Xd6Ks5wJ8_PM"
#define WIFI_SSID "wokwi-GUEST"
#define WIFI_PASSWORD ""

FirebaseData firebaseData;

String send_data = "OFF";
String read_data = "";

// Define GPIO pin for the external LED
#define LED_PIN 27

void setup() {
  Serial.begin(9600);
  pinMode(LED_PIN, OUTPUT); // Set GPIO27 as output for the LED

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);

  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  Serial.println();
  Serial.print("Connected to ");
  Serial.println(WIFI_SSID);
  Serial.print("IP Address is : ");
  Serial.println(WiFi.localIP());
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);

  Firebase.reconnectWiFi(true);

  Serial.println();
  delay(1000);
}

void loop() {
  // Toggle send_data between "ON" and "OFF"
  send_data = (send_data == "ON") ? "OFF" : "ON";

  // Upload send_data to Firebase
  if (Firebase.setString(firebaseData, "/data", send_data)) {
    Serial.print("data '");
    Serial.print(send_data);
    Serial.println("' Uploaded Successfully");
  } else {
    Serial.println(firebaseData.errorReason());
  }

  delay(1000);

  // Retrieve data from Firebase
  if (Firebase.getString(firebaseData, "/data")) {
    read_data = firebaseData.stringData();
    Serial.print("Read_data = ");
    Serial.println(read_data);

    if (read_data == "ON") {
      Serial.println("LED turned ON");
      digitalWrite(LED_PIN, HIGH); // Turn on external LED
    } else if (read_data == "OFF") {
      Serial.println("LED turned OFF");
      digitalWrite(LED_PIN, LOW); // Turn off external LED
    }
    Serial.println();
  } else {
    Serial.println(firebaseData.errorReason());
  }

  delay(3000);
}