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

#define BUTTON_DECREASE_PIN 2 // Tlačidlo pre zníženie počtu miest
#define BUTTON_INCREASE_PIN 3 // Tlačidlo pre zvýšenie počtu miest
#define LED_PIN 4 // Dióda indikujúca stlačené tlačidlo

LiquidCrystal_I2C lcd(0x27, 16, 2);

int parkingSpaces = 10; // Pôvodná hodnota počtu miest
const int maxSpaces = 10; // Maximálny počet parkovacích miest
const int minSpaces = 0;  // Minimálny počet parkovacích miest

bool buttonDecreaseState = false;
bool buttonIncreaseState = false;

void setup() {
  pinMode(BUTTON_DECREASE_PIN, INPUT_PULLUP);
    pinMode(BUTTON_INCREASE_PIN, INPUT_PULLUP);
      pinMode(LED_PIN, OUTPUT);
        
          lcd.init();
            lcd.backlight();

              Serial.begin(9600);
                updateDisplay();
                }

                void loop() {
                  // Kontrola stlačenia tlačidla pre zníženie
                    if (digitalRead(BUTTON_DECREASE_PIN) == LOW && !buttonDecreaseState) {
                        buttonDecreaseState = true;
                            if (parkingSpaces > minSpaces) {
                                  parkingSpaces--;
                                        updateDisplay();
                                            }
                                              }
                                                if (digitalRead(BUTTON_DECREASE_PIN) == HIGH && buttonDecreaseState) {
                                                    buttonDecreaseState = false;
                                                      }
                                                        
                                                          // Kontrola stlačenia tlačidla pre zvýšenie
                                                            if (digitalRead(BUTTON_INCREASE_PIN) == LOW && !buttonIncreaseState) {
                                                                buttonIncreaseState = true;
                                                                    if (parkingSpaces < maxSpaces) {
                                                                          parkingSpaces++;
                                                                                updateDisplay();
                                                                                    }
                                                                                      }
                                                                                        if (digitalRead(BUTTON_INCREASE_PIN) == HIGH && buttonIncreaseState) {
                                                                                            buttonIncreaseState = false;
                                                                                              }

                                                                                                // Indikácia diódy
                                                                                                  if (digitalRead(BUTTON_DECREASE_PIN) == LOW || digitalRead(BUTTON_INCREASE_PIN) == LOW) {
                                                                                                      digitalWrite(LED_PIN, HIGH);
                                                                                                        } else {
                                                                                                            digitalWrite(LED_PIN, LOW);
                                                                                                              }
                                                                                                              }

                                                                                                              void updateDisplay() {
                                                                                                                lcd.clear();
                                                                                                                  if (parkingSpaces == 0) {
                                                                                                                      lcd.print("Parkovisko plne");
                                                                                                                        } else {
                                                                                                                            lcd.print("Volne miesta: ");
                                                                                                                                lcd.print(parkingSpaces);
                                                                                                                                  }
                                                                                                                                    Serial.print("Pocet volnych miest: ");
                                                                                                                                      Serial.println(parkingSpaces);
                                                                                                                                      }