LED Dice

const int button = 12;
const int pin1 = 3;//middle led
const int pin2 = 4;//middle layer outer two
const int pin3 = 6;//bottom layer
const int pin4 = 5;//top layer
int randi;
int readValue = 0;
boolean lastbutton = false;
boolean currentbutton = false;

void setup()
{
  randomSeed(A0);//allows me to give a range instead of being limited to one number
  pinMode (button, INPUT);
  pinMode (pin1, OUTPUT);
  pinMode (pin2, OUTPUT);
  pinMode (pin3, OUTPUT);
  pinMode (pin4, OUTPUT);
  Serial.begin (9600);
}
boolean debounce (boolean lastbutton)
{
  boolean currentbutton = digitalRead (button);
  if (lastbutton != currentbutton)
  {
    delay (5);
    currentbutton = digitalRead (button);
  }
  return currentbutton;
}

void loop()
{
  currentbutton = debounce (lastbutton);//this is used so that the LED will stay on without having to hold down the button
  if (currentbutton == true && lastbutton == false)
  {
    randi = random (1,7);//this gives me a random number from 1-7 (1 is included but 7 is not): could also do random (6)+1
    Serial.println (randi);
    digitalWrite (pin1, HIGH);
    digitalWrite (pin2, HIGH);
    digitalWrite (pin3, HIGH);
    digitalWrite (pin4, HIGH);
    delay (50);
    digitalWrite (pin1, LOW);
    digitalWrite (pin2, LOW);
    digitalWrite (pin3, LOW);
    digitalWrite (pin4, LOW);
    delay (10);
    digitalWrite (pin1, HIGH);
    digitalWrite (pin2, HIGH);
    digitalWrite (pin3, HIGH);
    digitalWrite (pin4, HIGH);
    delay (50);
    digitalWrite (pin1, LOW);
    digitalWrite (pin2, LOW);
    digitalWrite (pin3, LOW);
    digitalWrite (pin4, LOW);
  }
  switch (randi)//this gives me cases that correlate to the number generated by the rani
  {
    case 1://if number is 1 only the middle LED will turn on
    digitalWrite (pin1, HIGH);
    break;
    case 2://if number is 2 the middle outside LED's will turn on
    digitalWrite (pin2, HIGH);
    break;
    case 3://if number is 3 the middle row LED's will turn on
    digitalWrite (pin1, HIGH);
    digitalWrite (pin2, HIGH);
    break;
    case 4: //if number is 4 the top and bottom layers of LED's will turn on
    digitalWrite (pin3, HIGH);
    digitalWrite (pin4, HIGH);
    break;
    case 5://if number is 5 the top and bottom as well as the middle LED will turn on
    digitalWrite (pin3, HIGH);
    digitalWrite (pin4, HIGH);
    digitalWrite (pin1, HIGH);
    break;
    case 6://if number is 6 every LED will be on EXCEPT for the middle LED
    digitalWrite (pin3, HIGH);
    digitalWrite (pin4, HIGH);
    digitalWrite (pin2, HIGH);
    break;
    default://if there is no number then no LED will be turned on
    digitalWrite (pin1, LOW);
    digitalWrite (pin2, LOW);
    digitalWrite (pin3, LOW);
    digitalWrite (pin4, LOW);
    break;

  }
  lastbutton = currentbutton;
}