#include <FastLED.h>

//FASTLED 
#define LEDstripPin 4                          
#define NUM_LEDS 255
#define COLOR_ORDER GRB
#define CHIPSET WS2812B

int j = 0;
int paletteIndex = 0; 
float indexDelta = 255/NUM_LEDS; 
CRGB leds[NUM_LEDS];

bool BassBeatTrigger = false;
bool BeatTrigger = false;
bool TrebleBeatTrigger = false;

DEFINE_GRADIENT_PALETTE( Rain_gp ) {
0, 255, 0, 0,       //Red
20, 255, 0, 0,      //Orange
61, 255, 255, 0,    //Yellow
102, 0, 255, 0,     //Green
143, 0, 0, 255,     //Blue
184, 75,0, 130,     //Indego
224, 148,0, 211,    //Violet
255, 200, 0, 0};   //Red 

CRGBPalette16 Rainbow(Rain_gp);

void setup() 
{
  FastLED.addLeds<WS2812B,LEDstripPin , GRB>(leds, NUM_LEDS);

  fill_solid(leds, NUM_LEDS, CRGB( 0, 0, 0));
  FastLED.show();
  FastLED.setBrightness(255);
}


void loop() 
{
  RainbowStrobe();
  BeatTrigger = true; 
}

void RainbowStrobe(){                                                                                                                      // RAINBOW STROBE
  int randomLED = random8(0,NUM_LEDS-1);
  int StrobeWidth =4;  //random8(2,4);


//fill_palette(leds, NUM_LEDS, paletteIndex, 255/NUM_LEDS,Rainbow,ledDisplayBrihtnessValue,LINEARBLEND); 
for( int i=0; i<NUM_LEDS; i++, j++)
  {
    if( j >= NUM_LEDS)        // index rolls beyond the array ?
    {
      j = 0;                  // wrap around
    }
    float thisHue = float( i) * hue_increment;
    leds[j] = CHSV( int(thisHue), 255, 255);
  }
FastLED.show();


if (BeatTrigger == true ){ 
  leds[randomLED] = CHSV(100, 0, 255);
  for(int i = 1; i <= StrobeWidth; i++){

        if (randomLED-i < 0){                                                                                      // i have no idea how to use modulo % in an array 
            leds[(randomLED-i)% NUM_LEDS] = CHSV(100, 0, 255);   
        } 
        
        if(randomLED+i >= NUM_LEDS-1){
          leds[(randomLED+i)%NUM_LEDS] = CHSV(100, 0, 255); 
          leds[randomLED-i] = CHSV(100, 0, 255);

        }else{
          leds[randomLED-i] = CHSV(100, 0, 255);
          leds[randomLED+i] = CHSV(100, 0, 255);                                          
        }
      } 
   
  BassBeatTrigger = false;
  BeatTrigger = false;
  TrebleBeatTrigger = false;
}
EVERY_N_MILLISECONDS(2){
  paletteIndex++;
}
FastLED.setBrightness(255);
FastLED.show();
  
}