const int latchPin = 8;
const int clockPin = 12;
const int dataPin = 11;
const int buttonPin = 2;
unsigned char lookup_7seg[] = {0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x80};
unsigned char shake_dice[] = {0x63,0x5C};
unsigned char roll_dice[] = {0x1C,0x58,0x54,0x4C};
int rand_seed;
int rand_num = 0;
unsigned char shake_toggle = 0;
int index = 0;
int shake_speed;

void DiceNumber(unsigned char num) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, lookup_7seg[num]);
  digitalWrite(latchPin, HIGH);
}
void AnimateDice(int seg, unsigned char *table) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, table[seg]);
  digitalWrite(latchPin, HIGH);
}

void setup() {
  pinMode(latchPin, OUTPUT);

  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  digitalWrite(latchPin, LOW);

  shiftOut(dataPin, clockPin, MSBFIRST, lookup_7seg[6]);
  digitalWrite(latchPin, HIGH);
  randomSeed(analogRead(0));
  // put your setup code here, to run once:

}

void loop() {
  if (digitalRead(buttonPin)) {
    shake_speed = 150;
    delay(30);
    while (digitalRead(buttonPin)) {
      rand_seed++;
      if (shake_toggle) {
        AnimateDice(0, shake_dice);
        shake_toggle = 0;
      }
      else {
        AnimateDice(1,shake_dice);
        shake_toggle = 1;
      }
      delay(80 + shake_speed);
      if (shake_speed > 0) {
        shake_speed -= 10;
      }
    }
    for (int rolls = 0; rolls < (rand_seed % 10 + 14); rolls++) {
      AnimateDice(index, roll_dice);
      delay((1 + rolls) * 20);
      index++;
      if (index > 3) {
        index = 0;
        rand_num = random(0, 6);
        Serial.println(rand_num);
        DiceNumber(rand_num);
      }
    }
  }
  // put your main code here, to run repeatedly:

}