#include <Adafruit_NeoPixel.h>
#include <EEPROM.h>

Adafruit_NeoPixel led(20, 11, NEO_GRB + NEO_KHZ800);

int amount = 0;

unsigned long ms = 0;

bool sw = true;

void setup() {
  Serial.begin(9600);
  led.begin();
  for (int i = 0; i < 19; i++) {
    led.setPixelColor(i, led.Color(0,0,0));
  }
  Serial.println("Input number between 0 - 4 to light the candles!");
  if (EEPROM.read(1) != 255) {
    amount = EEPROM.read(1);
  }
}

void loop() {
  if (Serial.available()) {
    amount = Serial.parseInt();
    EEPROM.update(1, amount);
    Serial.println(amount);
    if (Serial.available()) {
      Serial.read();
    }
    ms = millis();
  }
  if (ms < millis()) {
    ms = millis() + 1000;
    led.clear();
    if (sw) {
      sw = !sw;
      for (int i = 0; i < 20; i++) {
        led.setPixelColor(i, led.Color(0, 0, 0));
      }
    } else {
      sw = !sw;
      for (int i = 0; i < 20; i++) {
        led.setPixelColor(i, led.Color(0, 255, 0));
      }
    }
    for (int i = 0; i < 4; i++) {
      led.setPixelColor(i * 5, led.Color(0, 0, 0));
    }
    for (int i = 0; i < amount; i++) {
      led.setPixelColor(i * 5, led.Color(255, 255, 0));
    }
    led.show();
  }
}