const int BUTTON = A0;
const int LED = 13;
boolean lastButton = LOW;
boolean currentButton = LOW;
boolean ledOn = false;
int pins[8] = {2,3,4,5,6,7,8,9};
int digs[10] = {B111111,B110,B1011011,B1001111,B1100110,
                B1101101,B1111101,B111,B1111111,B1101111};
int seg = 0;
long lastTime = 0;
long onTime = 70;
int rollTime = onTime*6*3;
int rollCount = 18;

void setup() {
  // put your setup code here, to run once:
  pinMode (BUTTON, INPUT);
  for(int i = 0; i < 8; i++) {
    pinMode(pins[i], OUTPUT);
  }
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
  //rollTime = onTime*6*3;
}

void loop() {
  // put your main code here, to run repeatedly:
  currentButton = debounce(lastButton);              // Read debounced state
  if (lastButton == LOW && currentButton == HIGH)    // If it was pressed…
  {
    ledOn = HIGH;                                  // Toggle the LED value
    clear();
    rollCount = 18;
    //lastTime = millis();
    randomSeed(millis());
  }
  lastButton = currentButton;
  
  if(ledOn == HIGH) {
    nextSeg();
    rollCount--;
    if (rollCount == 0) { // if (millis() - lastTime > rollTime) {
      ledOn = LOW;
      putDigit(random(1, 6));
    }
  }
  digitalWrite(LED, ledOn);
}

void clear() {
  for (int i = 0; i < 8; i++) {
    digitalWrite(pins[i], LOW);
  }
}

void putDigit(int digit) {
  int mask = 1;
  for (int i = 0; i < 7; i++) {
    int state = digs[digit] & mask;
    digitalWrite(pins[i], state);
    mask <<= 1;
  }
}

void nextSeg() {
    digitalWrite(pins[seg], HIGH);
    delay(onTime);
    digitalWrite(pins[seg], LOW);
    seg++;
    seg %= 6;
}

boolean debounce(boolean last)
{
  boolean current = digitalRead(BUTTON);       // Read the button state
  if (last != current)                         // If it's different…
  {
    delay(5);                                  // Wait 5ms
    current = digitalRead(BUTTON);             // Read it again
  }
  return current;                              // Return the current value
}