// use the FastLED library (someone's pre-written code)
#include <FastLED.h>

// set how many LEDs there are and the data pin.
const int NUM_LEDS = 30;
const int DATA_PIN = 3;
const int BTN_PIN = 2;

// this creates an array to reference our LEDs
CRGB leds[NUM_LEDS];

void setup() {
  // tells the FastLED code e.g. what LEDs we are using, the data pin
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  
  // limit the strip's draw to 400mA at 5v 
  FastLED.setMaxPowerInVoltsAndMilliamps(5,400);
  
  // turns the brightness down (so my eyes don't hurt)
  FastLED.setBrightness(8);
  pinMode(2, INPUT_PULLUP);
}



void loop() {

    if (digitalRead (2) == LOW){
    for (int light= 0; light <30; light +=2) {
    leds[light] = CRGB::Red;;
    leds[29-light] = CRGB::Orange;;
    leds[1+light] = CRGB::Orange;;
    leds[28-light] = CRGB::Green;;
      FastLED.show(); 
        delay(550);
    }
    for (int light= 0; light <30; light +=2) {
    leds[light] = CRGB::Orange;;
    leds[29-light] = CRGB::Green;;
    leds[1+light] = CRGB::Red;;
    leds[28-light] = CRGB::Orange;;
      FastLED.show(); 
        delay(225);
    }
    for (int light= 0; light <30; light +=2) {
     leds[light].setRGB(random(255),random(255),random(255));
     leds[29-light].setRGB(random(255),random(255),random(255));
        FastLED.show(); 
        delay(550);
    }
    for (int light = 30; light >= 0; light--) {
    leds[light] = CRGB::Black;;
      FastLED.show(); 
    }
    for (int light= 0; light < 30; light+=2) {
    leds[29-light] = CRGB::Red;;
    leds[light].setRGB(random(255),random(255),random(255));
      FastLED.show(); 
      delay(225);
    }
    for (int light= 30; light >= 0; light-=2) {
    leds[29-light] = CRGB::Orange;;
    leds[light].setRGB(random(255),random(255),random(255));
      FastLED.show(); 
      delay(112.5);
    }
    for (int light= 30; light >= 0; light--) {
    leds[light] = CRGB::White;;
      FastLED.show(); 
      delay(225);
    }
    for (int light= 0; light <30; light +=2) {
    leds[light] = CRGB::Orange;;
    leds[29-light] = CRGB::Green;;
    leds[1+light] = CRGB::Red;;
    leds[28-light] = CRGB::Orange;;
      FastLED.show(); 
        delay(225);
    }
  }
}

void lightsOff(){
    for (int light= 0; light <30; light +=2) {
    leds[light] = CRGB::Black;;
    leds[29-light] = CRGB::Black;;
      FastLED.show(); 
        delay(225);
    }
}