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


LiquidCrystal_I2C lcd(0x27, 16, 2);


const int tombolPlusPin = 2;
const int tombolMinusPin = 3;
const int tombolEnterPin = 4;


int counter = 0;


unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50;


bool lastPlusState = HIGH;
bool lastMinusState = HIGH;
bool lastEnterState = HIGH;


bool showSpelling = false;
unsigned long spellingStartTime = 0;
const unsigned long spellingDuration = 2000;


String ejaAngka(int n)
{
  if (n == 0) return "nol";

  String satuan[] = {"", "satu", "dua", "tiga", "empat", "lima", "enam", "tujuh", "delapan", "sembilan"};
  String belasan[] = {"sepuluh", "sebelas", "dua belas", "tiga belas", "empat belas", "lima belas", "enam belas", "tujuh belas", "delapan belas", "sembilan belas"};
  String puluhan[] = {"", "", "dua puluh", "tiga puluh", "empat puluh", "lima puluh", "enam puluh", "tujuh puluh", "delapan puluh", "sembilan puluh"};

  String hasil = "";

  if (n >= 100)
  {
    int ratus = n / 100;
    if (ratus == 1) hasil += " ratus";
    else hasil += satuan[ratus] + " ratus";
    n %= 100;
    if (n > 0) hasil += " ";
  }

  if (n >= 20)
  {
    int puluh = n / 10;
    hasil += puluhan[puluh];
    n %= 10;
    if (n > 0) hasil += " " + satuan[n];
  }
  else if (n >= 12)
  {
    hasil += belasan[n - 10];
  }
  else if (n == 11)
  {
    hasil += "sebelas";
  }
  else if (n == 10)
  {
    hasil += "sepuluh";
  }
  else if (n > 0 && n < 10)
  {
    hasil += satuan[n];
  }

  return hasil;
}

void setup()
{

  lcd.init();
  lcd.backlight();
  lcd.clear();


  pinMode(tombolPlusPin, INPUT_PULLUP);
  pinMode(tombolMinusPin, INPUT_PULLUP);
  pinMode(tombolEnterPin, INPUT_PULLUP);


  updateDisplay();
}

void loop()
{
  unsigned long currentTime = millis();


  bool plusPressed = (digitalRead(tombolPlusPin) == LOW);
  bool minusPressed = (digitalRead(tombolMinusPin) == LOW);
  bool enterPressed = (digitalRead(tombolEnterPin) == LOW);


  if (plusPressed && !lastPlusState && (currentTime - lastDebounceTime > debounceDelay))
  {
    lastDebounceTime = currentTime;
    counter++;
    showSpelling = false;
    updateDisplay();
  }


  if (minusPressed && !lastMinusState && (currentTime - lastDebounceTime > debounceDelay))
  {
    lastDebounceTime = currentTime;
    counter--;
    showSpelling = false;
    updateDisplay();
  }


  if (enterPressed && !lastEnterState && (currentTime - lastDebounceTime > debounceDelay))
  {
    lastDebounceTime = currentTime;
    showSpelling = true;
    spellingStartTime = currentTime;
    updateDisplay();
  } 


  lastPlusState = plusPressed;
  lastMinusState = minusPressed;
  lastEnterState = enterPressed;


  if (showSpelling && (currentTime - spellingStartTime >= spellingDuration))
  {
    showSpelling = false;
    updateDisplay();
  }



  delay(10);
}

void updateDisplay()
{
  lcd.clear();
  if (showSpelling)
  {

    String ejaan = ejaAngka(counter);

    if (ejaan.length() <= 16)
    {
      lcd.setCursor(0,0);
      lcd.print(ejaan);
    }

    else
    {

      lcd.setCursor(0,0);
      lcd.print(ejaan.substring(0,16));
      lcd.setCursor(0,1);
      lcd.print(ejaan.substring(16,32));
    }
  }
  else
  {

    lcd.setCursor(0,0);
    lcd.print("Counter: ");
    lcd.print(counter);
    lcd.setCursor(0,1);
    lcd.print("Enter untuk eja");
  }
}