#include <LiquidCrystal_I2C.h>

#define incButton 2
#define onButton 3
#define offButton 4

LiquidCrystal_I2C lcd(0x27, 16, 2);

bool ledky[4] = {0, 0, 0, 0};
String menu[4] = {"LED 1", "LED 2", "LED 3", "LED 4"};
byte poloha = 0;
bool zmena = true;

void setup()
{
  pinMode(incButton, INPUT_PULLUP);
  pinMode(onButton, INPUT_PULLUP);
  pinMode(offButton, INPUT_PULLUP);

  DDRB |= 0b00001111;
  PORTB &= 0b11110000;

  lcd.init();
  lcd.backlight();
}

void loop()
{
  if (zmena)
  {
    for (byte ledka = 0; ledka < 4; ledka++)
      if (ledky[ledka])
        PORTB |= 1 << (3 - ledka);
      else
        PORTB &= ~(1 << (3 - ledka));

    lcd.clear();
    lcd.print(">");
    for (byte i = 0; i < 2; i++)
    {
      lcd.setCursor(1, i);
      if ((poloha + i) < 4)
      {
        lcd.print(menu[poloha + i]);
        lcd.setCursor(11, i);

        if (ledky[poloha + i])
          lcd.print("ON");
        else
          lcd.print("OFF");
      }
      else
      {
        lcd.print(menu[poloha + i - 4]);
        lcd.setCursor(11, i);

        if (ledky[poloha + i - 4])
          lcd.print("ON");
        else
          lcd.print("OFF");
      }
    }
    zmena = false;
  }

  checkButtons();
}

void checkButtons()
{
  static unsigned long lastIncButtonTime = 0;
  static unsigned long lastOnButtonTime = 0;
  static unsigned long lastOffButtonTime = 0;
  static const unsigned long debounceDelay = 50; // debounce čas v milisekundách

  if ((millis() - lastIncButtonTime) > debounceDelay)
  {
    if (digitalRead(incButton) == LOW)
    {
      zmena = true;
      if (poloha < 3)
        poloha++;
      else
        poloha = 0;
      lastIncButtonTime = millis();
    }
  }

  if ((millis() - lastOnButtonTime) > debounceDelay)
  {
    if (digitalRead(onButton) == LOW)
    {
      zmena = true;
      ledky[poloha] = true; // Zapnutie príslušnej LED
      lastOnButtonTime = millis();
    }
  }

  if ((millis() - lastOffButtonTime) > debounceDelay)
  {
    if (digitalRead(offButton) == LOW)
    {
      zmena = true;
      ledky[poloha] = false; // Vypnutie príslušnej LED
      lastOffButtonTime = millis();
    }
  }
}