#include <FastLED.h>

FASTLED_USING_NAMESPACE

#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif

#define DATA_PIN    12
//#define CLK_PIN   4
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
#define NUM_LEDS    144
CRGB leds[NUM_LEDS];

#define BRIGHTNESS          255
#define FRAMES_PER_SECOND  120

void setup() {
  delay(1000); // 3 second delay for recovery
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(BRIGHTNESS);
}

typedef void (*SimplePatternList[])();
SimplePatternList gPatterns = { rainbow, rainbowWithGlitter, };

uint8_t gCurrentPatternNumber = 0; // Index number of which pattern is current
uint8_t gHue = 0; // rotating "base color" used by many of the patterns

void loop()
{
  gPatterns[gCurrentPatternNumber]();
  FastLED.show();
  FastLED.delay(1000 / FRAMES_PER_SECOND);

  EVERY_N_MILLISECONDS( 20 ) {
    gHue++;
  }
  EVERY_N_SECONDS( 20 ) {
    nextPattern();
  }
}
#define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))
void nextPattern()
{
  gCurrentPatternNumber = (gCurrentPatternNumber + 1) % ARRAY_SIZE( gPatterns);
}
void rainbow()
{
  fill_rainbow( leds, NUM_LEDS, gHue, 7);
}

void rainbowWithGlitter()
{
  rainbow();
  addGlitter(80);
}

void addGlitter( fract8 chanceOfGlitter)
{
  if ( random8() < chanceOfGlitter) {
    leds[ random16(NUM_LEDS) ] += CRGB::White;
  }
}