#include <FastLED.h>



#define LED_PIN 2
#define LED_COUNT 48


CRGB leds[LED_COUNT];


#define BUTTON_1 3
#define BUTTON_2 4
#define BUTTON_3 5

#define BUTTON_4 6 // random number, may want to pick a better pin if needed


CRGB currentColor = CRGB::Black;

void setup() {
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, LED_COUNT);
  FastLED.setBrightness(255);

  pinMode(BUTTON_1, INPUT_PULLUP);
  pinMode(BUTTON_2, INPUT_PULLUP);
  pinMode(BUTTON_3, INPUT_PULLUP);
  
  // steps to setup the Interrupt for BUTTON_4
  pinMode(BUTTON_4, INPUT_PULLUP); // internal pull-up resistor
  attachInterrupt (digitalPinToInterrupt (BUTTON_4), changeEffect, CHANGE);
  
  // start with all LEDs black
  fill_solid(leds, LED_COUNT, CRGB::Black); // FastLED build-in function
  FastLED.show();
}

void loop() {
  // you could do something here or do a tiny delay here or nothing at all
}

void changeEffect(){
  bool button1 = digitalRead(BUTTON_1) == LOW;
  bool button2 = digitalRead(BUTTON_2) == LOW;
  bool button3 = digitalRead(BUTTON_3) == LOW;

  if (button1 && button2) {
    currentColor = CRGB::Red;
  } else if (button1 && button3) {
    currentColor = CRGB::Yellow;
  } else if (button2 && button3) {
    currentColor = CRGB::Blue;
  } else if (button1) {
    currentColor = CRGB::Green;
  } else if (button2) {
    currentColor = CRGB::Pink;
  } else if (button3) {
    currentColor = CRGB::White;
  } else {
    currentColor = CRGB::Black;
  }

  fill_solid(leds, LED_COUNT, currentColor);
  FastLED.show();
}