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

#define TIME_HEADER  'T'   // Header tag for serial time sync message
#define TIME_REQUEST  7    // ASCII bell character requests a time sync message

// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1
#define PIN            6

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS      24

#define SEC_COL        20
#define HOUR_COL       20
#define MIN_COL        20
#define STATIC_COL     10

// 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);

int delayval = 5; // delay for half a second
//setting the colors
char Colors[] = {'w', 'w', 'w', 'w', 'w', 'w', 'w', 'w', 'g', 'b', 'w', 'p', 'b', 'b', 'b', 'e', 'w', 'w', 'w', 'w', 'w', 'w', 'w', 'w'};


void setup() {
  Serial.begin(9600);
  setSyncProvider(requestSync);  //set function to call when sync required
  Serial.println("Waiting for sync message");


  // put your setup code here, to run once:

  // 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(){
 if (Serial.available()) {
    processSyncMessage();
  }
  /*
  if (timeStatus()!= timeNotSet) {
    digitalClockDisplay();
  }
  */
  int milis = ((millis()%1000)*24/1000);
  float m = (float) (minute()%60);
  float s = (float) (second()%60);
  float h = (float) (hour()%12);

  float minutes = (m + (s/60))*24/60;
  float hours = h + (m/60);
  hours = hours/0.5;

  int m2 = round(minutes)%24;
  int m1 = m2-1;
  if (m2 == 0){
    m1 = 23;
  }

  int h2 = round(hours)%24;
  int h1 = h2-1;
  if (h2 == 0){
    h1 = 23;
  }

  resetpixels();
  if (h2 != 23 && h1 != 23 && m1 != 23 && m2 != 23){
    pixels.setPixelColor(23, pixels.Color(STATIC_COL,STATIC_COL,STATIC_COL));
  }
  if (h2 != 0 && h1 != 0 && m1 != 0 && m2 != 0){
    pixels.setPixelColor(0, pixels.Color(STATIC_COL,STATIC_COL,STATIC_COL));
  }
  if (m2 == h2){
    pixels.setPixelColor(m1, pixels.Color(MIN_COL,0,MIN_COL));
    pixels.setPixelColor(m2, pixels.Color(MIN_COL,0,MIN_COL));
  } else {
    pixels.setPixelColor(h1, pixels.Color(HOUR_COL,0,0));
    pixels.setPixelColor(h2, pixels.Color(HOUR_COL,0,0));
    pixels.setPixelColor(m1, pixels.Color(0,0,MIN_COL));
    pixels.setPixelColor(m2, pixels.Color(0,0,MIN_COL));
  }
  pixels.setPixelColor(milis, pixels.Color(0,SEC_COL,0));
  pixels.show();
  delay(5);
}

void resetpixels(){
  for(int i=0;i<NUMPIXELS;i++){
    pixels.setPixelColor(i, pixels.Color(0, 0, 0));
    pixels.show(); // This sends the updated pixel color to the hardware
  }
  pixels.show();
}

void digitalClockDisplay(){
  // digital clock display of the time
  Serial.print(hour());
  printDigits(minute());
  printDigits(second());
  Serial.print(" ");
  Serial.print(day());
  Serial.print(" ");
  Serial.print(month());
  Serial.print(" ");
  Serial.print(year());
  Serial.println();
}

void printDigits(int digits){
  // utility function for digital clock display: prints preceding colon and leading 0
  Serial.print(":");
  if(digits < 10)
    Serial.print('0');
  Serial.print(digits);
}


void processSyncMessage() {
  unsigned long pctime;
  const unsigned long DEFAULT_TIME = 1357041600; // Jan 1 2013

  if(Serial.find(TIME_HEADER)) {
     pctime = Serial.parseInt();
     if( pctime >= DEFAULT_TIME) { // check the integer is a valid time (greater than Jan 1 2013)
       setTime(pctime); // Sync Arduino clock to the time received on the serial port
     }
  }
}

time_t requestSync()
{
  Serial.write(TIME_REQUEST);
  return 0; // the time will be sent later in response to serial mesg
}