#include <Adafruit_NeoPixel.h>

#define NUM_PIXELS 1
#define LEDPIN    2
#define SWITCHPIN 3 // pin for external switch to change modes
#define LED_TYPE    NEOPIXEL
#define COLOR_ORDER GRB

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_PIXELS, LEDPIN, NEO_GRB + NEO_KHZ800);

unsigned int mode = 0;
volatile bool newMode = false; // flag to indicate a new mode was initiated from button interupt

int currentColor = 0;
float displayColor[3];

void setup() {
  strip.begin();//initiates neopixels
  strip.setBrightness(255);//sets overall brightness 0 - 255. lower = easier power
  randomSeed(analogRead(2));
  // start off with white
  currentColor = 0;
  displayColor[0] = 255;
  displayColor[1] = 255;
  displayColor[2] = 255;
}

void loop() {
  //rainbow(10);
  //flicker();
  blink();
}

void showStrip() {
   // NeoPixel
   strip.show();
}

void setPixel(int Pixel, byte red, byte green, byte blue) {
  strip.setPixelColor(Pixel, strip.Color(red, green, blue));
}

void setAll(byte red, byte green, byte blue) {
  for(int i = 0; i < NUM_PIXELS; i++ ) {
    setPixel(i, red, green, blue);
  }
  showStrip();
}

void blackOut() {
  strip.clear();
  strip.show();
}

void blink() {
  setAll(255, 255, 255);
  delay(500);
  blackOut();
  delay(500);
}

void flicker() {

  float brt = 1.0;
  
  while(!newMode) {

    // 1 out of three chance we do not do full brightness

    if (random(1,4) > 3) {
      brt = (float)random(8, 10) / 10.0;
    }

    setAll(displayColor[0] * brt, displayColor[1] * brt, displayColor[2] * brt);
    delay(random(500, 6000));

    int rfl = random(2, 90);
    for (int i = 0; i < rfl; i++) {
      //int brt = random(50, 100);
      //setAll(brt, brt, brt);
      brt = (float)random(2, 4) / 10;
      setAll(displayColor[0] * brt, displayColor[1] * brt, displayColor[2] * brt);
      delay(random(20, 40));
      blackOut();
    }

    if (random(5) < 2 ) {
      brt = (float)random(3, 7) / 10.0;
      setAll(displayColor[0] * brt, displayColor[1] * brt, displayColor[2] * brt);
      delay(random(500, 5000));    
    }

    if (random(5) < 2) {
      blackOut();
      delay(random(100, 700));
    }
  }
}

void rainbow(int wait) {
  for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 144) {
    strip.rainbow(firstPixelHue);
    strip.show(); // Update strip with new contents
    delay(wait);  // Pause for a moment
  }
}