// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// released under the GPLv3 license to match the rest of the AdaFruit NeoPixel library

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

// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1
#define PIN            D5

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS     8

// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
// example for more information on possible values.
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define STATE_BOOT    1
#define STATE_ON      2
#define STATE_WORKING 3
#define STATE_MESH    4
#define STATE_ERR     5

#define BLINK_MS      2000
#define MAX_BRIGHT    255

int delayval = 500; // delay for half a second

int state = STATE_BOOT;
long dbgtime = millis();

int bright;

void setup() {
  // 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

  pixels.begin(); // This initializes the NeoPixel library.
}

void loop() {

  // switch states for debug

  if(millis() >= dbgtime + 6000) {
    dbgtime = millis();
    state++;
    if (state > 5) state = STATE_BOOT;
  }

  // brightness value for blinking

  bright = (int) ((sin(2.0f * 3.14159f / BLINK_MS * (millis() % BLINK_MS)) + 1.0) / 2.0 * MAX_BRIGHT + 0.5);


  //display state on ring
  switch(state) {

    case STATE_BOOT:
      for(int i=0;i<NUMPIXELS;i++){
        pixels.setPixelColor(i, pixels.Color(0,bright,0));
        pixels.show();
      }
      break;

    case STATE_ON:
      for(int i=0;i<NUMPIXELS;i++){
        pixels.setPixelColor(i, pixels.Color(0, MAX_BRIGHT, 0));
        pixels.show();
      }
      break;

     case STATE_WORKING:
      for(int i=0;i<NUMPIXELS;i++){
        pixels.setPixelColor(i, pixels.Color((MAX_BRIGHT-bright)*10/12, MAX_BRIGHT, 0));
        pixels.show();
      }
      break;

    case STATE_MESH:
      for(int i=0;i<NUMPIXELS;i++){
        if(i==7 || i==0 || i==3 || i==4)
          pixels.setPixelColor(i, pixels.Color(0, bright, 0));
        else
          pixels.setPixelColor(i, pixels.Color(0, MAX_BRIGHT - bright, 0));
        pixels.show();
      }
      break;

     case STATE_ERR:
      for(int i=0;i<NUMPIXELS;i++){
        pixels.setPixelColor(i, pixels.Color(bright, 0, 0));
        pixels.show();
      }
      break;
  }
}