#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <MFRC522.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

int pinBuzzer = 33;
int pb = 14;
bool isCheckIn = true; // Initial check-in status

#define RST_PIN 0
#define SS_PIN 5
MFRC522 mfrc522(SS_PIN, RST_PIN);

unsigned long lastDebounceTime = 0;  // For button debouncing
const unsigned long debounceDelay = 50; // Adjust debounce delay as needed

void setup() {
  Serial.begin(115200);
  lcd.begin(20, 4);
  lcd.init();
  lcd.setBacklight(255);
  lcd.clear();

  pinMode(pinBuzzer, OUTPUT);
  pinMode(pb, INPUT_PULLUP);

  // Setup RFID
  mfrc522.PCD_Init();
}

void loop() {
  // Button press detection with debouncing
  if (digitalRead(pb) == LOW && (millis() - lastDebounceTime) > debounceDelay) {
    lastDebounceTime = millis();
    isCheckIn = !isCheckIn;
    digitalWrite(pinBuzzer, HIGH);
    delay(1000);
    digitalWrite(pinBuzzer, LOW);
    delay(200);

    lcd.clear();
    lcd.setCursor(0, 0);
    if (isCheckIn) {
      lcd.print("Syafril masuk");
    } else {
      lcd.print("Syafril pulang");
    }
  }

  // RFID card detection and UID reading
  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
    // Handle RFID card data processing here (e.g., display UID on LCD)
    // ...

    delay(2000); // Optional delay after reading card

    // Reset RFID reader for next card
    mfrc522.PICC_HaltA();
    mfrc522.PCD_StopCrypto1();
  }
}