#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

/*posuvny register*/
#define latchpin 4
#define datapin 3
#define clockpin 5
uint8_t pattern=0b00000000;
uint8_t pattern1=0b00000000;
bool stav = false;

/*tlacidlo*/
const int buttonPin = 2;
int buttonState = LOW;
int lastButtonState = LOW;
long lastDebounceTime = 0;
long debounceDelay = 50;
unsigned long previousMillis = 0;
int interval = 500;
int mody=0;


void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Vypnute");

  pinMode(buttonPin, INPUT);

  pinMode(latchpin, OUTPUT);
  pinMode(datapin, OUTPUT);
  pinMode(clockpin, OUTPUT);
}

void loop() {
  int reading = digitalRead(buttonPin);
    if (reading != lastButtonState) {
        lastDebounceTime = millis();
    }
    if ((millis() - lastDebounceTime) > debounceDelay) {
        if (reading != buttonState) {
            buttonState = reading;
            if (buttonState == HIGH) {
               mody = (mody + 1) % 6;
                  sviet(mody);
                }
            }
        }
    
    lastButtonState = reading;

    unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    stav = !stav;
    digitalWrite(latchpin, LOW);
    shiftOut(datapin, clockpin, LSBFIRST, stav ? pattern : pattern1);
    digitalWrite(latchpin, HIGH);
  }
    }

void sviet(int mody){
switch (mody){
  case 0:
    pattern = 0b00000000;
    pattern1 = 0b00000000;
    lcd.clear();
    lcd.print("Vypnute");
    break;
  case 1:
    pattern = 0b11110000;
    pattern1 = 0b00001111;
    interval= 500;
    lcd.clear();
    lcd.print("Mod 1");
    break;
  case 2:
    pattern = 0b11001100;
    pattern1 = 0b00110011;
    interval= 1000;
    lcd.clear();
    lcd.print("Mod 2");
    break;
  case 3:
    pattern = 0b10010010;
    pattern1 = 0b01101101;
    interval= 700;
    lcd.clear();
    lcd.print("Mod 3");
    break;
  case 4:
    pattern = 0b00011000;
    pattern1 = 0b11100111;
    interval= 600;
    lcd.clear();
    lcd.print("Mod 4");
    break;
  case 5:
    pattern = 0b01010101;
    pattern1 = 0b10101010;
    interval= 1200;
    lcd.clear();
    lcd.print("Mod 5");
    break;
}

}