// Saw a LED pattern I liked and tried to replicate it in code
// note for anything specific yet, mainly trying to see if I can code it like in the video
// https://youtu.be/iOL7UZpYnXY?t=204
// Still having issues with the "wrap around" of the effect on the ring version

#include <FastLED.h>
#define NUM_LEDS 80
CRGBArray<NUM_LEDS> leds;

//Using two arrays to view what it looks like as a strip as well as in a ring
CRGBSet stripled (leds (0, NUM_LEDS-1));
CRGBSet ringled (leds (0, NUM_LEDS-1));

float startpos = 30.0;
float increment = 0.0;
float maxvalue = 6.0;
float ipos = startpos;
float invpos = startpos;
CRGB splashcolor = CRGB(255, 50, 50);
double velocity = 0.2;  //How fast to increment the splash around the ring
float fadeby = 6.0;
bool displayon = true;

void setup() {
  FastLED.addLeds<SK6812, 10, GRB>(leds, NUM_LEDS);
  FastLED.addLeds<SK6812, 9, GRB>(leds, NUM_LEDS);
  Serial.begin(115200);
}

void loop() {
  //Generate a new "splash" every 1 second
  EVERY_N_MILLISECONDS(200)
  {
    startpos = random(1,NUM_LEDS-1);
    ipos = startpos;
    invpos = startpos;
    increment = 0.0;
 
    maxvalue = 6.0;
    if (maxvalue > NUM_LEDS)
      maxvalue -= NUM_LEDS;
 
    displayon = true;
  }
  // Only draw pixels while there is a splash to animate
  if(displayon)
    showsplash();
 
  //Fade everything by a little so the splash of color shows with a delay
  stripled.fadeToBlackBy(fadeby);
 
  FastLED.show();
}
 
void showsplash()
{
  //Increment the LED being lit
  ipos += velocity;
  invpos -= velocity;
  increment += velocity;
 
  //Wrap around the ring / strip
  if(invpos < 0)
    invpos = NUM_LEDS + invpos;
 
  if(ipos >= NUM_LEDS)
    ipos = ipos - NUM_LEDS;
 
  //Only splash for 8 or so pixels (set by maxvalue)
  if (increment > maxvalue)
    displayon = false;
 
  stripled[ipos] = splashcolor;
  stripled[invpos] = splashcolor; 
}