// Forum: https://forum.arduino.cc/t/fastled-visual-looping-issue/1134527/4
// Sketch from post #4
// Sketch made by pathogenex
// This Wokwi project: https://wokwi.com/projects/366625947150023681

#include <FastLED.h>
#define DATA_PIN     5
#define NUM_LEDS    12

int DELAYTIME = 500;
int NextLED;
int CurrentLED;
int PreviousLED;  
CRGB leds[NUM_LEDS];

//----------------------------------------------------------------------------------

//----------------------------------------------------------------------------------
void setup() {
  Serial.begin(9600);
  FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);
}
//----------------------------------------------------------------------------------
void loop() {
 
    for( CurrentLED = 0; CurrentLED <= (NUM_LEDS-1); CurrentLED++) {           

      if (CurrentLED == 0){
        PreviousLED = 11;
      }
      else {
        PreviousLED = CurrentLED - 1;
      }
      
      if (CurrentLED == 11){
        NextLED = 0;


        
      }
      else{
        NextLED = CurrentLED +1;

      }
      Serial.print("PreviousLED :");
      Serial.println(PreviousLED);
      Serial.print("CurrentLED :");
      Serial.println(CurrentLED);
      Serial.print("NextLED :");
      Serial.println(NextLED); 
      Serial.println("NEXT-------------");  
      
      fill_solid(leds, NUM_LEDS, 0x000000);                  
      leds[PreviousLED] = 0x777040;
      leds[CurrentLED] = 0xFFD700;
      leds[NextLED] = 0x777040;
      
      delay(10);
      FastLED.show();
      delay(DELAYTIME);
      
    }
    Serial.println("!!LOOP!!");
}