#include <FastLED.h>

#define COLORBTN 8
#define MODEBTN 9
#define ACTIVATEBTN 10

#define LED_PIN 6
#define LED_COUNT 30
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
#define BRIGHTNESS 255
#define FRAMES_PER_SECOND 60
CRGB leds[LED_COUNT];
uint32_t color;
uint32_t colors[] = {CRGB::Blue,
                     CRGB::Red,
                     CRGB::Cyan,
                     CRGB::Green,
                     CRGB::HotPink,
                     CRGB::Indigo,
                     CRGB::DarkSlateGrey,
                     CRGB::Yellow, };
int numOfColors = 8;
int colorNum =0;

#define FASTMODE 0
#define SLOWMODE 1
int mode = 0;

bool active = false;

void setup() {
  pinMode(COLORBTN, INPUT_PULLUP);
  pinMode(MODEBTN, INPUT_PULLUP);
  pinMode(ACTIVATEBTN, INPUT_PULLUP);

  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, LED_COUNT).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(BRIGHTNESS);

  color = colors[colorNum];
}

void loop() {
  if(!digitalRead(COLORBTN)){
    delay(250);
    ColorSwitch();
  }

  if(!digitalRead(MODEBTN))
  mode = FASTMODE;
  else
  mode = SLOWMODE;

  if(!digitalRead(ACTIVATEBTN))
  {
    delay(250);
    
    if(!active){
    fill_solid(leds,LED_COUNT,CRGB::Black);
    FastLED.show();
    FastLED.setBrightness(0);
    for (int i = 0; i < LED_COUNT; i++) 
    {
      leds[i] = color;
      FastLED.setBrightness(255 * i/(LED_COUNT-1));
      FastLED.show();
      delay((mode==FASTMODE) ? 5 : 80);
    }
    active = true;
    }
    else{
      for (int i = LED_COUNT - 1; i >= 0; i--) 
    {
      leds[i] = CRGB::Black;
      FastLED.setBrightness(255 * i/(LED_COUNT-1));
      FastLED.show();
      delay((mode == FASTMODE) ? 5 : 80);
    }
    active = false;
    }
  }
}

void ColorSwitch(){
  color = colors[colorNum];
  colorNum++;
  if(colorNum == numOfColors)
  colorNum=0;
}