#include <FastLED.h>

#define NUM_LEDS 15
#define DATA_PIN 6

#define LEFT_BUTTON_PIN 12
#define RIGHT_BUTTON_PIN 11

#define ANIMATION_DELAY 40

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
  pinMode(LEFT_BUTTON_PIN, INPUT_PULLUP);
  pinMode(RIGHT_BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  if(digitalRead(LEFT_BUTTON_PIN)== LOW){
    animateLeft();
  } else if (digitalRead(RIGHT_BUTTON_PIN) == LOW) {
    animateLeft();
  }
  else{
    fill_solid(leds, NUM_LEDS, CRGB::Red);
    FastLED.show();
  }
}

void animateLeft() {
  fill_solid(leds, NUM_LEDS, CRGB::Black);
  fill_solid(&(leds[0]), 1, CRGB::Orange);
  FastLED.show();
  delay(ANIMATION_DELAY);

  fill_solid(&(leds[1]), 2, CRGB::Orange);
  FastLED.show();
  delay(ANIMATION_DELAY);

  for(int i = 0; i < NUM_LEDS - 2; i++){
    fill_solid(leds, NUM_LEDS, CRGB::Black);
    fill_solid(&(leds[i]), 3, CRGB::OrangeRed);
    FastLED.show();
    delay(ANIMATION_DELAY);
  }

  fill_solid(leds, NUM_LEDS, CRGB::Black);
  fill_solid(&(leds[NUM_LEDS - 1]), 2, CRGB::Orange);
  FastLED.show();
  delay(ANIMATION_DELAY);

  fill_solid(leds, NUM_LEDS, CRGB::Black);
  fill_solid(&(leds[NUM_LEDS - 1]), 1, CRGB::Orange);
  FastLED.show();
  delay(ANIMATION_DELAY);

  fill_solid(leds, NUM_LEDS, CRGB::Black);
  FastLED.show();
}