#include <Adafruit_NeoPixel.h>

#define PIN 3 // data pin
#define NUM_LEDS 32

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRB + NEO_KHZ800);

int redColor = 0;
int greenColor = 0;
int blueColor = 0;
int colorHigh = 255;
int direction = 1;

/********************************/
void setup() {
  pixels.begin();
  pixels.show(); // Initialize all pixels to 'off'
  
  Serial.begin(115200);
  flashLed(1);

  randomSeed(43);
  
  Serial.println("LightRing Starting!");
  flashLed(3);
}

/*******************************/
void loop() {

  //circleLED(50);
  //cycleLED(50);
  //circleNoTail(100);
  circleFade(10);
}

void circleFade(int delayValue) {
  adjustColor();
  for (int inx = 0; inx < NUM_LEDS; inx++) {
    pixels.setPixelColor(inx, pixels.Color(100, colorHigh, 0));
  }
  pixels.show();
  delay(delayValue);  
}

void adjustColor() {
  if (colorHigh >= 255 || colorHigh <= 5) {
    delay(500);
    direction = direction * -1;
  }
  colorHigh = colorHigh + (direction * 1);   
}

void circleNoTail(int delayValue) {
  setColor();
  for (int inx = 0; inx < NUM_LEDS; inx++) {
    pixels.setPixelColor(inx, pixels.Color(redColor, greenColor, blueColor));
    pixels.show();
    delay(delayValue);
  }
  delay(delayValue*2);  
}

void circleLED(int delayValue) {
  setColor();
  for (int inx = 0; inx < NUM_LEDS; inx++) {
    int tail = getTail(inx);
    int tail2 = getTail(tail);
    int tail3 = getTail(tail2);
    pixels.fill(pixels.Color(0, 0, 0), 0, NUM_LEDS);
    pixels.setPixelColor(inx, pixels.Color(redColor, greenColor, blueColor));
    pixels.setPixelColor(tail, pixels.Color((redColor/3), (greenColor/3), (blueColor/3)));
    pixels.setPixelColor(tail2, pixels.Color((redColor/5), (greenColor/5), (blueColor/5)));
    pixels.setPixelColor(tail2, pixels.Color((redColor/7), (greenColor/7), (blueColor/7)));
    pixels.show();
    delay(delayValue);
  }
}

void cycleLED(int delayValue) {
  setColor();
  for (int inx = 0; inx < NUM_LEDS; inx++) {
    int tail = getTail(inx);
    int tail2 = getTail(tail);
    int tail3 = getTail(tail2);
    pixels.fill(pixels.Color(0, 0, 0), 0, NUM_LEDS);
    pixels.setPixelColor(inx, pixels.Color(redColor, greenColor, blueColor));
    pixels.setPixelColor(tail, pixels.Color((redColor/3), (greenColor/3), (blueColor/3)));
    pixels.setPixelColor(tail2, pixels.Color((redColor/5), (greenColor/5), (blueColor/5)));
    pixels.setPixelColor(tail2, pixels.Color((redColor/7), (greenColor/7), (blueColor/7)));
    pixels.show();
    delay(delayValue);
  }
  setColor();
  for (int inx = NUM_LEDS; inx >= 0; inx--) {
    int tail = getTailReverse(inx);
    int tail2 = getTailReverse(tail);
    int tail3 = getTailReverse(tail2);
    pixels.fill(pixels.Color(0, 0, 0), 0, NUM_LEDS);
    pixels.setPixelColor(inx, pixels.Color(redColor, greenColor, blueColor));
    pixels.setPixelColor(tail, pixels.Color((redColor/3), (greenColor/3), (blueColor/3)));
    pixels.setPixelColor(tail2, pixels.Color((redColor/5), (greenColor/5), (blueColor/5)));
    pixels.setPixelColor(tail2, pixels.Color((redColor/7), (greenColor/7), (blueColor/7)));
    pixels.show();
    delay(delayValue);
  }
}


int getTail(int tail) {
  if (tail == 0) {
    return NUM_LEDS;
  }
  return (tail-1);
}

int getTailReverse(int tail) {
  if (tail == NUM_LEDS) {
    return 0;
  }
  return (tail+1);
}

// setColor()
// picks random values to set for RGB
void setColor(){
  redColor = random(0, 255);
  greenColor = random(0,255);
  blueColor = random(0, 255);
}


void flashLed(int times) {
  for (int inx = 0; inx < times; inx++) {
    digitalWrite(13, LOW);
    delay(100);
    digitalWrite(13, HIGH);
    delay(100);
  }
  digitalWrite(13, LOW);
}