#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int ledPin = 3;
const int ledUtripPin = 4; 
unsigned long zadnjeStanjeLED = 0;
bool utripanje = false;
bool ledStanje = false;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(ledUtripPin, OUTPUT); 
  Serial.begin(9600);
  Serial.println("Vnesi kodo: ");
  lcd.init();
  lcd.backlight();
}

void loop() {
  if (Serial.available()) {
    String vnos = Serial.readStringUntil('\n');
    if (vnos.length() != 6) {
      Serial.println("Napaka, ponovni vnos");
      lcd.clear();
      lcd.print("Napaka vnosa");
    } 
    else {
      vnasanje(vnos);
    }
  }
  if (utripanje) {
    utripnila();
  }
}

void vnasanje(String vnos) {
  if (vnos == "777111") {
    if (!ledStanje) {
      digitalWrite(ledPin, HIGH);
      lcd.clear();
      lcd.print("LED vklop");
      utripanje = false;
      ledStanje = true;
    } else {
      digitalWrite(ledPin, LOW);
      lcd.clear();
      lcd.print("LED izklop");
      utripanje = false;
      ledStanje = false;
    }
  } else if (vnos == "777333") {
    utripanje = true;
    lcd.clear();
    lcd.print("LED utrip");
    digitalWrite(ledUtripPin, LOW); 
  } else if (vnos == "777330") {
    utripanje = false;
    digitalWrite(ledUtripPin, LOW); 
    lcd.clear();
    lcd.print("LED izklop utripanja");
  } else if (vnos == "777444") {
    utripanje = false;
    for (int i = 0; i < 10; i++) {
      digitalWrite(ledUtripPin, HIGH);
      delay(300);
      digitalWrite(ledUtripPin, LOW);
      delay(300);
    }
    lcd.clear();
    lcd.print("LED utrip 10x");
  }
}

void utripnila() {
  unsigned long trenutneMillis = millis();
  if (trenutneMillis - zadnjeStanjeLED >= 500) {
    zadnjeStanjeLED = trenutneMillis;
    ledStanje = !ledStanje;
    digitalWrite(ledUtripPin, ledStanje);
  }
}