// Code massiv
const uint8_t massivLength = 3;
uint8_t massiv[massivLength] = {1,2,3};

//Main RGB LED
uint8_t red = 13;
uint8_t green = 12;

//Button-LED #1
uint8_t red1 = 11;
uint8_t button1 = 10;

//Button-LED #2
uint8_t red2 = 9;
uint8_t button2 = 8;

//Button-LED #3
uint8_t red3 = 7;
uint8_t button3 = 6;

const uint8_t buttonsCount = 3;
const uint8_t Press = 2;
uint8_t massivBtn[buttonsCount] = {button1, button2, button3};
uint8_t stateBtn[buttonsCount] = {1,1,1};
 
uint8_t currentPosition = 0;

void setup() {
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(red1, OUTPUT);
  pinMode(button1, INPUT_PULLUP);
  pinMode(red2, OUTPUT);
  pinMode(button2, INPUT_PULLUP);
  pinMode(red3, OUTPUT);
  pinMode(button3, INPUT_PULLUP);
  Serial.begin(9600);
}

void DisableLed()
{
  digitalWrite(red1, LOW);
  digitalWrite(red2, LOW);
  digitalWrite(red3, LOW);
}

void EnableLed(uint8_t number)
{
switch (number)
      {
         case 1:
          digitalWrite(red1, HIGH);
            break;
         case 2:
          digitalWrite(red2, HIGH);
            break;
         case 3:
          digitalWrite(red3, HIGH);
            break;
      }
}

void ErrorInput()
{
  Serial.println("WRONG CODE! RED LIGHT");
  digitalWrite(red, HIGH);
  DisableLed();
}

void RightCombination()
{
  Serial.println("RIGHT CODE! GREEN LIGHT");
  digitalWrite(green, HIGH);
  DisableLed();
}

void ButtonPress(uint8_t number)
{
   Serial.print("Button - ");
   Serial.print(number);
   Serial.println(" press");
   if (currentPosition == 0) 
   {
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
   }
   if (number == massiv[currentPosition++]) {
     EnableLed(currentPosition);
     if (currentPosition == massivLength) {
        currentPosition = 0;
        RightCombination();
     }
   } else {
     currentPosition = 0;
     ErrorInput();
   }
}

void readButtons()
{
  for (uint8_t n = 0; n < buttonsCount; n++) 
  {
    uint8_t btnState = digitalRead(massivBtn[n]);
    if (stateBtn[n] == btnState && btnState == LOW) {
      delay(10);
      if (digitalRead(massivBtn[n]) == LOW) {
        stateBtn[n] = Press;
        ButtonPress(n + 1);
      }
    } else {
      (stateBtn[n] != Press) ? stateBtn[n] = btnState : (btnState) ? stateBtn[n] = btnState : stateBtn[n] = Press;
    }
  }
}

void loop() {
  readButtons();
}