#include <WiFi.h>
#include <HTTPClient.h>
#include <WiFiClientSecure.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const int LED_PIN = 4; 
const String fbURL = "https://led-controller-8a61d-default-rtdb.firebaseio.com/led.json?auth=a0070SrfgMuF9xfo5KTJa62FklguFtUBNaYlMtUb";

// We keep these global so they don't get deleted and recreated every loop
WiFiClientSecure client;
HTTPClient http;

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  
  WiFi.begin(ssid, password, 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100); 
    Serial.print(".");
  }
  Serial.println("\nConnected!");

  client.setInsecure(); // Skip SSL certificate check for speed
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    // Instead of http.begin every time, we just call it once 
    // and use the keep-alive nature of HTTP 1.1
    http.begin(client, fbURL);
    
    int code = http.GET();
    
    if (code == 200) {
      String payload = http.getString();
      
      // Fast cleaning of the data
      payload.replace("\"", "");
      payload.trim();

      if (payload == "on") {
        digitalWrite(LED_PIN, HIGH);
      } else {
        digitalWrite(LED_PIN, LOW);
      }
    }
    
    // IMPORTANT: We do NOT call http.end() here. 
    // Keeping it open is what makes it "Instant."
  }
  
  // 100ms is enough to feel instant but not crash the ESP32
  delay(100); 
}