#include <FastLED.h>

#define TOTAL_LEDS 100
#define DATA_PIN 5

CRGB leds[TOTAL_LEDS];

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S3!");
  
  FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, TOTAL_LEDS);
  FastLED.clear();
  FastLED.show();
  
  for (int i = 0; i < TOTAL_LEDS; i++) {
    leds[i] = CRGB(128, 128, 128);
  }
  FastLED.show();
  Serial.println("All LEDs are reset!");
}

void light_led_forward(int i) {
  leds[i % TOTAL_LEDS] = CRGB(0, 255, 0); // Green
  // leds[i % TOTAL_LEDS] = CRGB(255, 0, 0); // Red
  Serial.print((i % TOTAL_LEDS) + 1);
  Serial.print(" (f)");
}

void clear_led_forward(int i) {
  leds[(TOTAL_LEDS - 1 + i) % TOTAL_LEDS] = CRGB(128, 128, 128); // Grey
}

void light_led_backward(int i) {
  // leds[(TOTAL_LEDS + 1 - 1 - i) % TOTAL_LEDS] = CRGB(0, 255, 0); // Green
  leds[(TOTAL_LEDS + 1 - 1 - i) % TOTAL_LEDS] = CRGB(255, 0, 0); // Red
  Serial.print(((TOTAL_LEDS + 1 - 1 - i) % TOTAL_LEDS) + 1);
  Serial.print(" (b)");
}

void clear_led_backward(int i) {
  leds[(TOTAL_LEDS + 1 - i) % TOTAL_LEDS] = CRGB(128, 128, 128); // Grey
}

void loop() {
  for (int i = 0; i < TOTAL_LEDS; i++) {
    // Clear Forward LEDs
    clear_led_forward(i);

    // Clear Backward LEDs
    clear_led_backward(i);

    // Forward
    Serial.print("Testing LED: ");
    light_led_forward(i);
    Serial.print(", ");
    light_led_backward(i);
    Serial.print(".");
    Serial.println();
    
    FastLED.show();
    delay(250);
  }
}