#define LED1  13
#define LED2  12
#define LED3  11
#define LED4  10
#define LED5  9
#define LED6  8
#define LED7  7
#define LED8  6


const byte leds[] = {LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8};

const byte buttons[] = {5, 4, 3, 2};
byte lastButtons[] = {1, 1, 1, 1};
unsigned long lastReads[] = {0, 0, 0, 0};

byte currentState = 0;
byte currentStep = 0;

unsigned long lastStep = 0;
unsigned long stepDelay = 1000ul;


void setup() {

  for (int i = 0; i < sizeof(leds); i++) {
    pinMode(leds[i], OUTPUT);
  }
  for (int i = 0; i < sizeof (buttons); i++) {
    pinMode(buttons[i], INPUT_PULLUP);
  }

}

void loop() {


  //what time is it now..
  unsigned long now  = millis();
  //read all button, debounce at 50ms on change
  for ( int i = 0; i < sizeof(buttons); i++) {
    if (now - lastReads[i] >= 50) {
      byte btn = digitalRead(buttons[i]);
      if (btn != lastButtons[i]) {
        lastReads[i] = now; //start debouncing..
        lastButtons[i] = btn;
        if (btn == LOW) {
          currentState = i + 1;
          currentStep = 0;
          AllOff();
        }
      }
    }
  }

//check to see if button is held down..
bool someDown =  false;
  for (int i=0; i<sizeof (buttons);i++){
    if (lastButtons[i]== 0){
      someDown = true;
    }
  }
  //if not still down, drop the press..
  //comment next out if you don't want to hold down button..
  if (!someDown){
    currentState = 0;
  }
  //currentState is the current button held down/pressed..
  switch (currentState) {
    case 0: AllOff(); break;
    case 1: {
        switch (currentStep) {
          case 0: digitalWrite(LED1, HIGH); lastStep = now; currentStep++; break;
          case 1: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 2: digitalWrite(LED2, HIGH); lastStep = now; currentStep++; break;
          case 3: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 4: digitalWrite(LED1, LOW);
            digitalWrite(LED3, HIGH);
            lastStep = now; currentStep++; break;
          case 5: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 6: digitalWrite(LED2, LOW);
            digitalWrite(LED4, HIGH);
            lastStep = now; currentStep++; break;
          case 7: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 8: digitalWrite(LED3, LOW);
            digitalWrite(LED5, HIGH);
            lastStep = now; currentStep++; break;
          case 9: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 10: digitalWrite(LED4, LOW);
            digitalWrite(LED6, HIGH);
            lastStep = now; currentStep++; break;
          case 11: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 12: digitalWrite(LED5, LOW);
            digitalWrite(LED7, HIGH);
            lastStep = now; currentStep++; break;
          case 13: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 14: digitalWrite(LED6, LOW);
            digitalWrite(LED8, HIGH);
            lastStep = now; currentStep++; break;
          case 15: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 16: digitalWrite(LED7, LOW); lastStep = now; currentStep++; break;
          case 17: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 18: digitalWrite(LED7, LOW); currentStep++; break;
          case 19: AllOff(); currentStep++; break;
        }
      } break;
    case 2: {
        switch (currentStep) {
          case 0: digitalWrite(LED1, HIGH); lastStep = now; currentStep++; break;
          case 1: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 2: digitalWrite(LED1, LOW);
            digitalWrite(LED2, HIGH);
            lastStep = now; currentStep++; break;
          case 3: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 4: digitalWrite(LED2, LOW);
            digitalWrite(LED1, HIGH);
            digitalWrite(LED3, HIGH);
            lastStep = now; currentStep++; break;
          case 5: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 6: digitalWrite(LED1, LOW);
            digitalWrite(LED3, LOW);
            digitalWrite(LED2, HIGH);
            digitalWrite(LED4, HIGH);
            lastStep = now; currentStep++; break;
          case 7: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 8: digitalWrite(LED2, LOW);
            digitalWrite(LED4, LOW);
            digitalWrite(LED3, HIGH);
            digitalWrite(LED4, HIGH);
            lastStep = now; currentStep++; break;
          case 9: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 10: digitalWrite(LED3, LOW);
            digitalWrite(LED5, LOW);
            digitalWrite(LED4, HIGH);
            digitalWrite(LED6, HIGH);
            lastStep = now; currentStep++; break;
          case 11: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 12: digitalWrite(LED4, LOW);
            digitalWrite(LED6, LOW);
            digitalWrite(LED5, HIGH);
            digitalWrite(LED7, HIGH);
            lastStep = now; currentStep++; break;
          case 13: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 14: digitalWrite(LED5, LOW);
            digitalWrite(LED7, LOW);
            digitalWrite(LED6, HIGH);
            digitalWrite(LED8, HIGH);
            lastStep = now; currentStep++; break;
          case 15: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 16: digitalWrite(LED6, LOW);
            digitalWrite(LED8, LOW);
            digitalWrite(LED7, HIGH);
            lastStep = now; currentStep++; break;
          case 17: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 18: digitalWrite(LED7, LOW);
            digitalWrite(LED8, HIGH);
            lastStep = now; currentStep++; break;
          case 19: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 20: digitalWrite(LED8, LOW);
            lastStep = now; currentStep++; break;
          case 21: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 22: digitalWrite(LED8, LOW);
            currentStep++; break;
          case 23: AllOff(); currentStep++; break;
        }
      } break;
    case 3: {
        switch (currentStep) {
          case 0: digitalWrite(LED1, HIGH);
            lastStep = now; currentStep++; break;
          case 1: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 2: digitalWrite(LED1, LOW);
            digitalWrite(LED2, HIGH);
            lastStep = now; currentStep++; break;
          case 3: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 4: digitalWrite(LED2, LOW);
            digitalWrite(LED3, HIGH);
            lastStep = now; currentStep++; break;
          case 5: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 6: digitalWrite(LED3, LOW);
            digitalWrite(LED4, HIGH);
            lastStep = now; currentStep++; break;
          case 7: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 8: digitalWrite(LED4, LOW);
            digitalWrite(LED5, HIGH);
            lastStep = now; currentStep++; break;
          case 9: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 10: digitalWrite(LED5, LOW);
            digitalWrite(LED6, HIGH);
            lastStep = now; currentStep++; break;
          case 11: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 12: digitalWrite(LED6, LOW);
            digitalWrite(LED7, HIGH);
            lastStep = now; currentStep++; break;
          case 13: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 14: digitalWrite(LED7, LOW);
            digitalWrite(LED8, HIGH);
            lastStep = now; currentStep++; break;
          case 15: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 16: digitalWrite(LED8, LOW);
            digitalWrite(LED7, HIGH);
            lastStep = now; currentStep++; break;
          case 17: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 18: digitalWrite(LED7, LOW);
            digitalWrite(LED6, HIGH);
            lastStep = now; currentStep++; break;
          case 19: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 20: digitalWrite(LED6, LOW);
            digitalWrite(LED5, HIGH);
            lastStep = now; currentStep++; break;
          case 21: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 22: digitalWrite(LED5, LOW);
            digitalWrite(LED4, HIGH);
            lastStep = now; currentStep++; break;
          case 23: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 24: digitalWrite(LED4, LOW);
            digitalWrite(LED3, HIGH);
            lastStep = now; currentStep++; break;
          case 25: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 26: digitalWrite(LED3, LOW);
            digitalWrite(LED2, HIGH);
            lastStep = now; currentStep++; break;
          case 27: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 28: digitalWrite(LED2, LOW);
            digitalWrite(LED1, HIGH);
            lastStep = now; currentStep++; break;
          case 29: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 30: AllOff(); currentStep++; break;
        }
      } break;
    case 4: {
        switch (currentStep) {
          case 0: digitalWrite(LED1, HIGH);
            lastStep = now; currentStep++; break;
          case 1: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 2: digitalWrite(LED2, HIGH);
            lastStep = now; currentStep++; break;
          case 3: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 4: digitalWrite(LED3, HIGH);
            lastStep = now; currentStep++; break;
          case 5: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 6: digitalWrite(LED4, HIGH);
            lastStep = now; currentStep++; break;
          case 7: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 8: digitalWrite(LED5, HIGH);
            lastStep = now; currentStep++; break;
          case 9: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 10: digitalWrite(LED6, HIGH);
            lastStep = now; currentStep++; break;
          case 11: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 12: digitalWrite(LED7, HIGH);
            lastStep = now; currentStep++; break;
          case 13: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 14: digitalWrite(LED8, HIGH);
            lastStep = now; currentStep++; break;
          case 15: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 16: digitalWrite(LED8, LOW);
            lastStep = now; currentStep++; break;
          case 17: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 18: digitalWrite(LED7, LOW);
            lastStep = now; currentStep++; break;
          case 19: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 20: digitalWrite(LED6, LOW);
            lastStep = now; currentStep++; break;
          case 21: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 22: digitalWrite(LED5, LOW);
            lastStep = now; currentStep++; break;
          case 23: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 24: digitalWrite(LED4, LOW);
            lastStep = now; currentStep++; break;
          case 25: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 26: digitalWrite(LED3, LOW);
            lastStep = now; currentStep++; break;
          case 27: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 28: digitalWrite(LED2, LOW);
            lastStep = now; currentStep++; break;
          case 29: if (now - lastStep >= stepDelay) {
              currentStep++;
            } break;
          case 30: AllOff(); currentStep++; break;

        }
      } break;
  }




}

void AllOff() {
  for (int i = 0; i < sizeof(leds); i++) {
    digitalWrite(leds[i], LOW);
  }
}