#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define buttonPin0 4
#define buttonPin1 3
#define buttonPin2 2
#define ledPin0 8
#define ledPin1 7
#define ledPin2 6

#define debounceDelay 50
bool lastButtonState0=false;
unsigned long lastDebounceTime0=0;
bool buttonState0;

bool lastButtonState1=false;
unsigned long lastDebounceTime1=0;
bool buttonState1;

bool lastButtonState2=false;
unsigned long lastDebounceTime2=0;
bool buttonState2;

void setup() {
  pinMode(buttonPin0, INPUT);
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(ledPin0, OUTPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);

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

  zobraz("Hello World!");
}

void loop() {
  bool reading0 = digitalRead(buttonPin0);
  if (reading0 != lastButtonState0) {
    lastDebounceTime0 = millis();
  }
  if ((millis() - lastDebounceTime0) > debounceDelay) {
    if (reading0 != buttonState0) {
      buttonState0 = reading0;
      if (buttonState0 == HIGH) {
        digitalWrite(ledPin0, HIGH);
        digitalWrite(ledPin1, LOW);
        digitalWrite(ledPin2, LOW);
        zobraz("TL1 - stlacene");
      }
    }
  }

  lastButtonState0 = reading0;
  
  bool reading1 = digitalRead(buttonPin1);
  if (reading1 != lastButtonState1) {
    lastDebounceTime1 = millis();
  }
  if ((millis() - lastDebounceTime1) > debounceDelay) {
    if (reading1 != buttonState1) {
      buttonState1 = reading1;
      if (buttonState1 == HIGH) {
        digitalWrite(ledPin0, LOW);
        digitalWrite(ledPin1, HIGH);
        digitalWrite(ledPin2, LOW);
        zobraz("TL2 - stlacene");
      }
    }
  }

  lastButtonState1 = reading1;
  
  bool reading2 = digitalRead(buttonPin2);
  if (reading2 != lastButtonState2) {
    lastDebounceTime2 = millis();
  }
  if ((millis() - lastDebounceTime2) > debounceDelay) {
    if (reading2 != buttonState2) {
      buttonState2 = reading2;
      if (buttonState2 == HIGH) {
        digitalWrite(ledPin0, LOW);
        digitalWrite(ledPin1, LOW);
        digitalWrite(ledPin2, HIGH);
        zobraz("TL3 - stlacene");
      }
    }
  }

  lastButtonState2 = reading2;
}

void zobraz(String text){
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(text);
}