#include <Adafruit_NeoPixel.h>

#define LED_PIN     22
#define LED_COUNT  20
#define BRIGHTNESS 255

#define BUTTON_PIN 25

Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB  + NEO_KHZ800);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP); //When pressed, change color.
  // Serial.println("Hello, ESP32!");

  strip.begin();
  strip.show();
  strip.setBrightness(BRIGHTNESS);

  strip.show();
}

void setColorCircle(int r, int g, int b)
{
    for(int i=0; i<strip.numPixels(); i++)
  {
    strip.setPixelColor(i, strip.Color(r,   g,   b));
    strip.show();
    delay(100);
  }
}

int curR = 255;
int curG = 255;
int curB = 255;

int modes[3][3] = {{255,255,255}, {255, 0, 255}, {255, 255, 0}};

int curMode = 0;

void loop() {
  // put your main code here, to run repeatedly:
  if(!digitalRead(BUTTON_PIN))
  {
    curR = modes[curMode][0];
    curG = modes[curMode][1];
    curB = modes[curMode][2];

    curMode = curMode + 1;
    if(curMode > 3) //TODO: Get array length.
      curMode = 0;
  }
  setColorCircle(curR, curG, curB);
  delay(50); // this speeds up the simulation
}