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

const int buzzerPin = 10;
const int servoPin = 9;
const int buttonPin = 2;
const int ledPin = 13;
const int blinkingLedPin = 12;
const int totalSlots = 8;

Servo doorServo;

LiquidCrystal_I2C lcd(0x27, 16, 2);

int currentSlots = totalSlots;
bool buttonPressed = false;

void setup() {
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(blinkingLedPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  doorServo.attach(servoPin);
  doorServo.write(0);
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("Sisa Slot: ");
  lcd.setCursor(0, 1);
  lcd.print(currentSlots);
}

void loop() {
  if (digitalRead(buttonPin) == LOW && !buttonPressed) {
    buttonPressed = true;
    if (currentSlots > 0) {
      doorServo.write(90);
      blinkingLed();
      delay(1000);
      doorServo.write(0);
      delay(1000);
      currentSlots--;
      updateLCD();
      stopBlinkingLed();
    } else {
      buzzBuzzer();
    }
  } else if (digitalRead(buttonPin) == HIGH && buttonPressed) {
    buttonPressed = false;
  }
}

void updateLCD() {
  lcd.clear();
  lcd.print("Sisa Slot: ");
  lcd.setCursor(0, 1);
  lcd.print(currentSlots);
}

void buzzBuzzer() {
  digitalWrite(ledPin, HIGH);
  tone(buzzerPin, 1000);
  delay(2000);
  noTone(buzzerPin);
  digitalWrite(ledPin, LOW);
}

void blinkingLed() {
  digitalWrite(blinkingLedPin, HIGH);
}

void stopBlinkingLed() {
  digitalWrite(blinkingLedPin, LOW);
}