#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20,4);

byte znak[] = {
  B00010,
  B00100,
  B00100,
  B01110,
  B11111,
  B11111,
  B11111,
  B01110
};

byte vlastnyChar[] = {
  B01110,
  B01110,
  B00100,
  B10101,
  B01110,
  B01110,
  B01010,
  B10001
};

byte firstState1 = HIGH;
byte firstState2 = HIGH;
byte firstState3 = HIGH;
byte firstState4 = HIGH;

int num[2] = {0,0};
int long currentTime = 0;
int nahodaX;
int nahodaY;
int body = 0;
bool bodyFirst = true;


void setup() {
  Serial.begin(9600);
  Serial.println("Tvoje body: "+String(body));
  lcd.init();
  lcd.backlight();
  lcd.createChar(0, vlastnyChar);
  lcd.createChar(1, znak);
  lcd.home();
  lcd.write(0);

  randomSeed(analogRead(A0));
  nahodaX = random(0,19);
  nahodaY = random(0,3);
  lcd.setCursor(nahodaX, nahodaY);
  lcd.write(1);

  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
}



void loop() {
//--------------- Nahodne generovanie znaku --------------
  if(num[0] == nahodaY && num[1] == nahodaX){
    body++;
    Serial.println("Skvelé našiel si JABLKO!   Tvoje body: "+String(body));
    nahodaX = random(0,19);
    nahodaY = random(0,3);

    lcd.setCursor(nahodaX, nahodaY);
    lcd.write(1);
  }


 //---------------- Pohyb panacika ------------------------- 
  int state1 = digitalRead(2);
  int state2 = digitalRead(3);
  int state3 = digitalRead(4);
  int state4 = digitalRead(5);


  if(firstState1 == HIGH && state1 == LOW){ //Dolne
    lcd.setCursor(num[1], num[0]);
    lcd.print(" ");
    num[0]++;
    if(num[0] > 3){
      num[0] = 0;
    }
    lcd.setCursor(num[1], num[0]);
    lcd.write(0);
  }


  if(firstState2 == HIGH && state2 == LOW){ //Pravo
    lcd.setCursor(num[1], num[0]);
    lcd.print(" ");
    num[1]++;
    if(num[1] > 19){
      num[1] = 0;
    }
    lcd.setCursor(num[1], num[0]);
    lcd.write(0);
  }


  if(firstState4 == HIGH && state4 == LOW){ //Hore
    lcd.setCursor(num[1], num[0]);
    lcd.print(" ");
    num[0]--;
    if(num[0] < 0){
      num[0] = 3;
    }
    lcd.setCursor(num[1], num[0]);
    lcd.write(0);
  }


  if(firstState3 == HIGH && state3 == LOW){ //Ľavo
    lcd.setCursor(num[1], num[0]);
    lcd.print(" ");
    num[1]--;
    if(num[1] < 0){
      num[1] = 19;
    }
    lcd.setCursor(num[1], num[0]);
    lcd.write(0);
  }


  firstState1 = state1;
  firstState2 = state2;
  firstState3 = state3;
  firstState4 = state4;

}