#include "FastLED.h"                                          // FastLED library.

#if FASTLED_VERSION < 3001000
#error "Requires FastLED 3.1 or later; check github for latest code."
#endif

//This is where we adjust things to match our unique project:
#define NUM_STRIPS 3
#define NUM_LEDS_PER_STRIP 16
#define NUM_LEDS NUM_LEDS_PER_STRIP * NUM_STRIPS 
#define BRIGHTNESS  255      // 255 is full brightness, 128 is half
#define SATURATION  255     // 0-255, 0 is pure white, 255 is fully saturated color
#define BUTTON_PIN  2      // Connect the button to GND and one of the pins.
#define UPDATES_PER_SECOND 100

byte prevKeyState = HIGH;         // button is active low

static uint8_t middleIndex = NUM_LEDS_PER_STRIP;
static uint8_t lastIndex = NUM_LEDS_PER_STRIP*2;
int db[] = {5,4,3,2,1,0,15,14,13,12,11,10,9,8,7,6,
           21,20,19,18,17,16,31,30,29,28,27,26,25,24,23,22,
           33,32,47,46,45,44,43,42,41,40,39,38,37,36,35,34};

CRGB leds[NUM_LEDS];


//------------------SETUP------------------
void setup() {
  delay( 2000 ); // power-up safety delay
  
  // Assign pin 3, 5 and 6 as LED singal pin
  FastLED.addLeds<WS2811, 3>(leds, 0, NUM_LEDS_PER_STRIP);
  FastLED.addLeds<WS2811, 5>(leds, NUM_LEDS_PER_STRIP, NUM_LEDS_PER_STRIP);
  FastLED.addLeds<WS2811, 6>(leds, NUM_LEDS_PER_STRIP*2, NUM_LEDS_PER_STRIP);
   
  FastLED.setBrightness( BRIGHTNESS );
 
   pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  
  byte currKeyState = digitalRead(BUTTON_PIN);

  if ((prevKeyState == LOW) && (currKeyState == HIGH)) {
    shortKeyPress();
  }
  prevKeyState = currKeyState;
  
  secondhand();
  fill_black();
  middlehand();
  middleIndex = middleIndex + 1;
  if (middleIndex == NUM_LEDS_PER_STRIP*2){
    middleIndex = NUM_LEDS_PER_STRIP;
    fill_black2();
    lasthand();
    lastIndex = lastIndex + 1;
    if (lastIndex == NUM_LEDS_PER_STRIP*3){
      lastIndex = NUM_LEDS_PER_STRIP*2;
      fill_black3();
    }
  
  }
}

void shortKeyPress() {
  middleIndex = NUM_LEDS_PER_STRIP;
  lastIndex = NUM_LEDS_PER_STRIP*2;
  fill_black();
  fill_black2();
  fill_black3();
  }  


void secondhand() {
  for(int i = 0; i < NUM_LEDS_PER_STRIP; i++) { 
    leds[db[i]] = CRGB::Red; 
    FastLED.delay(100); 
    }
}

void middlehand() {
  leds[db[middleIndex]] = CRGB::Green;
  FastLED.delay(100); 
}

void lasthand() {
  leds[db[lastIndex]] = CRGB::Blue;
  FastLED.delay(100); 
}

void fill_black() {
  for(int i = 0; i < NUM_LEDS_PER_STRIP; i++) { 
    leds[i] = CRGB::Black; }
}

void fill_black2() {
  for(int i = NUM_LEDS_PER_STRIP; i < NUM_LEDS_PER_STRIP*2; i++) { 
    leds[i] = CRGB::Black; }
}

void fill_black3() {
  for(int i = NUM_LEDS_PER_STRIP*2; i < NUM_LEDS_PER_STRIP*3; i++) { 
    leds[i] = CRGB::Black; }
}