// song; wake me up (2cello), link: https://www.youtube.com/watch?v=ElI0_fqFacA


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

// set how many LEDs there are and the data pin.
const int numLeds = 30;
const int ledStripPin = 6;

const int beat = 208.5; // orginally 417

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

void setup() {
  // tells the FastLED code e.g. what LEDs we are using, the data pin
  FastLED.addLeds<NEOPIXEL, ledStripPin>(leds, numLeds);

  // 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(7, INPUT_PULLUP);
}

void loop() {
    if (digitalRead(7) == LOW) {
      song();  
    } 
  }

void song(){
  hook(10); // counts for 2 beat
  respond_out(5);
  respond_out(6);
  respond_out(7);
  respond_out(9);
  respond_out(10);
  respond_out(8);
  respond_out(9);
  respond_out(9);
  respond_out(10);
  respond_out(9);
  respond_out(9);
  respond_out(10);
  delay(beat);
  respond_combined(4,10);
  respond_in(7);
  respond_in(6);
  //clear_in();
  delay(340);
  respond_in(8);
  respond_in(9);
  respond_in(8);
  respond_in(7);
  respond_in(6);
  respond_in(8);
  respond_combined(4,10);
  respond_out(8);
  respond_out(9);
  respond_in(10);
  respond_in(8);
  respond_in(8);
  respond_in(9);
  respond_in(8);
  respond_in(7);
  respond_in(6);
  respond_in(8);
  respond_combined(4,10);
  respond_out(8);
  respond_out(9);
  respond_in(10);
  respond_in(14);
  respond_in(13);
  respond_in(9);
  respond_in(7);
  respond_in(6);
  respond_in(9);
  respond_combined(4,10);
  //clear_in();
  fade();
}

void reset(){
  for (int light=0; light<30; light++) {
    leds[light].setRGB(0,0,0);
    FastLED.show();
  }
}

void respond_out(int vol) {
  const int delay_between = (beat / vol);
  // delay_between * vol = beat / 2 (208.5)

  for (int light=0; light<vol; light++) {
    leds[29 - light].setRGB(255, 0, 0);
    leds[light].setRGB(255, 0, 0);

    FastLED.show();
    delay(delay_between);
  }

  delay(beat);
  reset();
}

void respond_in(int vol) {
  const int delay_between = (beat / vol);
  // delay_between * vol = beat / 2 (208.5)

  for (int light=0; light<vol; light++) {
    leds[15 + light].setRGB(0, 255, 0);
    leds[15 - light].setRGB(0, 255, 0);

    FastLED.show();
    delay(delay_between);
  }

  delay(beat);
  reset();
}

void hook(int vol) { // start
  // make it like respond_out but it led light will return back to the start

  const int delay_between = (beat / vol);
  // delay_between * vol = beat / 2 (208.5)

  for (int light=0; light<vol; light++) {
    leds[29 - light].setRGB(255, 0, 0);
    leds[light].setRGB(255, 0, 0);

    FastLED.show();
    delay(delay_between);
  }

  delay(beat);

    for (int light=0; light<vol; light++) {
    leds[15 + light].setRGB(0, 255, 0);
    leds[15 - light].setRGB(0, 255, 0);

    FastLED.show();
    delay(delay_between);
  }

  delay(beat);
  reset();
}

void fade() { // end part (final ++>)
  // makes every led fade off

  for (int light=0; light<30; light++) {
    leds[light].setRGB(255, 255, 255);
  } 
  FastLED.show();
  delay(100);

  for (int light=0; light<30; light++) {
    int randomNumber = random(1,30);
    leds[randomNumber].setRGB(0, 0, 0);

    delay(13.44);
    FastLED.show();
  }

  for (int light=0; light<30; light++) {
    leds[light].setRGB(0, 0, 0);

    delay(13.44);
    FastLED.show();
  }
}

void clear_in() {
    const int delay_between = (beat / 30);
  // delay_between * vol = beat / 2 (208.5)

  for (int light=0; light<30; light++) {
    leds[15 + light].setRGB(0, 255, 255);
    leds[15 - light].setRGB(0, 255, 255);

    FastLED.show();
    delay(delay_between);
  }

  delay(beat);
  reset();
}


void respond_combined(int vol1, int vol2) {
  // vol1 = out, vol2 = in

  const int delay_between = (beat / vol1);
  // delay_between * vol = beat / 2 (208.5)

  for (int light=0; light<vol1; light++) {
    leds[15 + light].setRGB(0, 0, 255);
    leds[15 - light].setRGB(0, 0, 255);

    FastLED.show();
    delay(delay_between / 2);
  }

  for (int light=0; light<vol2; light+=2) {
    leds[29 - light].setRGB(255, 255, 0);
    leds[light].setRGB(255, 255, 0);

    FastLED.show();
    delay(delay_between / 2);
  }

  delay(beat);
  reset();
}