#include <FastLED.h>

#define NUM_LEDS 4

#define BUTTON_1 34
#define BUTTON_2 35

#define DATA_PIN 15
#define CLOCK_PIN 13

CRGB leds[NUM_LEDS];

volatile uint8_t counter = 0;
volatile uint8_t led_mode = 0;

void led_increment(){
  led_mode = 0;
  counter++;
  if(counter == 16) counter = 0;
}

void color_increment(){
  led_mode = 1;
}

void setup() {
  // put your setup code here, to run once:
  // Serial.begin(115200);
  // Serial.println("Hello, ESP32!");
  //pinMode(LED_BUILTIN, OUTPUT);
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  pinMode(BUTTON_1, INPUT_PULLUP);
  pinMode(BUTTON_2, INPUT_PULLUP);
  attachInterrupt(BUTTON_1, color_increment, FALLING);
  attachInterrupt(BUTTON_2, led_increment, FALLING);
  Serial.begin(9600);
}

void loop() {
  if(led_mode == 0){
    leds[0] = CRGB(255*((counter & 0x01) >> 0), 0, 0);
    leds[1] = CRGB(255*((counter & 0x02) >> 1), 0, 0);
    leds[2] = CRGB(255*((counter & 0x04) >> 2), 0, 0);
    leds[3] = CRGB(255*((counter & 0x08) >> 3), 0, 0);
    delay(10);
  } else {
    leds[0] = CRGB::SkyBlue;
    leds[1] = CRGB::OrangeRed;
    leds[2] = CRGB::Green;
    leds[3] = CRGB::Red;
  }
  FastLED.show();
}