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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int pinmasuk = 8;
const int pinkeluar = 9;
const int BEL = A0;
const int LED_HIJAU = A1;
const int LED_MERAH = A2;

const int batas = 5;

int masuk = 5;
int keluar = 4;
int total = 9;

String statusPesan = "";

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.print("SELAMAT DATANG");
  lcd.setCursor(0, 1);
  lcd.print("SILAHKAN MASUK");
  delay(2000);

  pinMode(pinmasuk, INPUT);
  pinMode(pinkeluar, INPUT);
  pinMode(BEL, OUTPUT);
  pinMode(LED_HIJAU, OUTPUT);
  pinMode(LED_MERAH, OUTPUT);
}

void loop() {
  // Reset status
  statusPesan = "";

  if (digitalRead(pinmasuk) == HIGH) {
    if (total < batas) {
      masuk++;
      total++;
      statusPesan = "Pengunjung Masuk";
      digitalWrite(BEL, HIGH);
      digitalWrite(LED_HIJAU, HIGH);
      digitalWrite(LED_MERAH, LOW);
      delay(200);
      digitalWrite(BEL, LOW);
      digitalWrite(LED_HIJAU, LOW);
    } else {
      statusPesan = "Ruang Penuh!";
      digitalWrite(BEL, HIGH);
      digitalWrite(LED_MERAH, HIGH);
      digitalWrite(LED_HIJAU, LOW);
      delay(300);
      digitalWrite(BEL, LOW);
    }
  }

  if (digitalRead(pinkeluar) == HIGH) {
    if (total > 0) {
      keluar++;
      total--;
      statusPesan = "Pengunjung Keluar";
      digitalWrite(BEL, HIGH);
      digitalWrite(LED_HIJAU, HIGH);
      digitalWrite(LED_MERAH, LOW);
      delay(200);
      digitalWrite(BEL, LOW);
      digitalWrite(LED_HIJAU, LOW);
    }
  }

  // Tampilkan informasi di LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("M:");
  lcd.print(masuk);
  lcd.print(" K:");
  lcd.print(keluar);
  lcd.print(" T:");
  lcd.print(total);

  lcd.setCursor(0, 1);
  lcd.print(statusPesan);

  delay(500);
}