#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN 6

#define BUTTON_PIN 2
const int ledPin = 13;    // the number of the LED pin


int lastState = 0;


// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(24, PIN, NEO_GRB + NEO_KHZ800);

// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel.  Avoid connecting
// on a live circuit...if you must, connect GND first.

void setup() {
  Serial.begin(9600); // Any baud rate should work
  Serial.println("Hello Arduino\n");

  // This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
  #if defined (__AVR_ATtiny85__)
    if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
  #endif
  // End of trinket special code

  pinMode(BUTTON_PIN, INPUT);

  strip.begin();
  strip.setBrightness(255);
  strip.show(); // Initialize all pixels to 'off'
  randomSeed(analogRead(0));

  colorWipestart(strip.Color(0, 255, 0), 30); // Green

}

// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void loop() {
  // Some example procedures showing how to display to the pixels:
/*
  colorWipe(strip.Color(255, 0, 0), 50); // Red
  clr(); delay(1000);
*/
 //     Serial.println(lastState);
  int value = digitalRead((BUTTON_PIN));
  if (lastState != value) {
    lastState = value;
    if (value == 0) {
      Serial.println(" released");
      randroulette();
    }
    if (value == 1) {
      Serial.println(" pressed");
    }
  }
// delay(1000);
}

void randpixel() {
  uint16_t i;

  clr();
  i = random(1, 24);  
    strip.setPixelColor(i, strip.Color(255, 255, 255));
    strip.show();
    delay(100);
}

void randroulette() {
  uint16_t i, c, c2, j;
  c = strip.Color(255, 255, 255);
  c2 = strip.Color(0, 255, 255);
  clr();
  j = random(0, 23);  
//  Serial.println(j);

  for(i=0; i< strip.numPixels(); i++) {
    clr();
    strip.setPixelColor(i, strip.Color(255, 255, 255));
    strip.show();
    delay(50);
  }
  for(i=0; i< strip.numPixels(); i++) {
    clr();
    strip.setPixelColor(i, strip.Color(255, 255, 255));
    strip.show();
    delay(50);
  }
  for(i=0; i< j; i++) {
    clr();
    strip.setPixelColor(i, strip.Color(255, 255, 255));
    strip.show();
    delay(50);
//    Serial.println(i);
  }

//  Serial.println(j);
  clr();
  strip.setPixelColor(j, strip.Color(255, 0, 0));
  strip.show();

}


// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, c);
    strip.show();
    delay(wait);
  }
}
void colorWipestart(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, c);
    strip.show();
    delay(wait);
  }
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, 0);
    strip.show();
    delay(wait);
  }
}



void rainbow(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256; j++) {
    for(i=0; i<strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel((i+j) & 255));
    }
    strip.show();
    delay(wait);
  }
}

// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
    for(i=0; i< strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
    }
    strip.show();
    delay(wait);
  }
}

//Theatre-style crawling lights.
void theaterChase(uint32_t c, uint8_t wait) {
  for (int j=0; j<10; j++) {  //do 10 cycles of chasing
    for (int q=0; q < 3; q++) {
      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, c);    //turn every third pixel on
      }
      strip.show();

      delay(wait);

      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, 0);        //turn every third pixel off
      }
    }
  }
}

//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
  for (int j=0; j < 256; j++) {     // cycle all 256 colors in the wheel
    for (int q=0; q < 3; q++) {
      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, Wheel( (i+j) % 255));    //turn every third pixel on
      }
      strip.show();

      delay(wait);

      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
        strip.setPixelColor(i+q, 0);        //turn every third pixel off
      }
    }
  }
}

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}

//clears the display
void clr(){
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, 0);
    strip.show();
  }  
}