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


LiquidCrystal_I2C lcd(0x27, 16, 2);    // Adresa displeja 16 stlpcov, 2 riadky

const int buttonPin = 4; // pint na ktorom je zapojenny blue button
int ButtonPosition = 0;
int lastButtonPosition = 0; 


const int buttonPinYellow = 5; // pint na ktorom je zapojenny yellow button
int ButtonPositionYellow = 0;
int lastButtonPositionYellow = 0; 


int from = 0;
int to = 100;
int help = 1;

void setup() {
  lcd.init(); //inicializacia LCD
  lcd.backlight(); // zapnutie podsvitenia LCD

  pinMode(buttonPin, INPUT);  // modre tlacidlo nastavene ako input
  pinMode(buttonPinYellow, INPUT);  // zlte tlacidlo nastavene ako input
  lcd.print("Pouzi tlacidla");
}

void loop() {
  ButtonPosition = digitalRead(buttonPin);  // stav tlacidla
  ButtonPositionYellow = digitalRead(buttonPinYellow);  // stav zlteho tlacidla

  if (ButtonPosition != lastButtonPosition) {
    
    if (ButtonPosition == HIGH) {
      
      int randomNumber = random(from, to); // generacia nahodneho cisla
      lcd.clear(); // Vycistenie LCD obrazovky
      
      lcd.setCursor(0,0);
      lcd.print("Nahodne cislo: ");
      
      lcd.setCursor(0, 1); //
      lcd.print(randomNumber); // vypisanie nahodneho cisla
      
      delay(1000); // pockaj 2 sec

      lcd.clear();
      lcd.print("Pouzi tlacidlo");
    }
    lastButtonPosition = ButtonPosition;  // posledny stav modreho tlacidla
  }
  



   //ButtonPositionYellow = digitalRead(buttonPinYellow);  // stav zlteho tlacidla

  if (ButtonPositionYellow != lastButtonPositionYellow) {
    
    if (ButtonPositionYellow == HIGH) {
      
      switch (help) {
        case 1:
          to = 100;
          break;
        
        case 2:
          to = 1000;
          break;

        case 3:
          to = 10000;
          break;
        case 4:
          to = 100;
          help = 1;
          break;
      }


      lcd.clear(); // Vycistenie LCD obrazovky

      lcd.setCursor(0,0);
      lcd.print("Cisla budu ");

      lcd.setCursor(0,1);
      lcd.print("od:");
      lcd.print(from);


      lcd.setCursor(7,1);
      lcd.print("do:");
      lcd.print(to);

      delay(1000); // pockaj 2 sec

      help++;
    }
    lastButtonPositionYellow = ButtonPositionYellow;  // posledny stav zlteho tlacidla
  }

}