#include <FastLED.h> // https://github.com/FastLED/FastLED

#define ROWS 16 // matrix rows
#define COLS 16 // matrix columns
#define NUMPIX (ROWS * COLS) // the full matrix
#define PIXPIN 5 // Arduino data/digital pin
#define MAXBRIGHT 255 // pixels brightness, 0 - 255
CRGB pix[NUMPIX]; // create object to control [NUMPIX]

#include <RTClib.h>
RTC_DS1307 rtc;

#include "words.h" // words in the clock
#include "showMin.h" // show minutes
#include "showHour.h" // show hours
// #include "tests.h" // test functions for letter and word placement

unsigned long timer, ms1000 = 1000; // one second
int oldMin; // clear old time

void setup() {
  // Serial.begin(115200); // enable for testing
  FastLED.addLeds<WS2812B, PIXPIN, GRB>(pix, NUMPIX);
  FastLED.setBrightness(MAXBRIGHT);
  FastLED.clear(); // empty pixel buffer
  FastLED.show(); // display empty buffer

  if (! rtc.begin()) {
    Serial.println(F("ERROR reading RTC"));
    Serial.flush();
    while (1);
  }

  // TIME FUNCTIONS
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); // run once after inserting new battery
  // rtc.adjust(DateTime (2000, 1, 2, 3, 4, 56));  // adjustable time for testing
  // rtc.adjust(DateTime(year, month, date, hour, minute, second));

  // TEST FUNCTIONS
  // sayall(); while (1); // un-comment test.h... test all words then halt
  // lightall(); while (1); // un-comment test.h... test all LEDs then halt
}

void loop () {
  if (millis() - timer > ms1000) { // update every second
    timer = millis(); // reset timer
    // gettimedate(); // print time and date text in Serial Monitor with external function
    DateTime now = rtc.now(); // get local time and date

    // UPDATE ONLY AT TOP OF MINUTE
    if (now.minute() != oldMin) { // check for minute change
      oldMin = now.minute(); // store new minute
      FastLED.clear(); // clear previous clock reading
    }

    the(); tim(); is(); // these words will always be on

    // CALCULATE MINUTES, UNTIL, PAST
    if (now.minute() > 0) { // only show "minutes" after "zero"

      if (now.minute() >= 20 && now.minute() < 30) { // 21 through 29 becomes "twenty" (min) "past"
        twnty();
        showMin(now.minute() - 20); // subtract 20 from 21..29 = minutes
      }

      if (now.minute() == 30) { // exactly 30
        hlf(); pst(); // "half" "past"
      }

      if (now.minute() > 30 && now.minute() <= 40) { // 31 through 39 becomes "twenty" (min) "until"
        twnty();
        showMin(40 - now.minute()); // subtract 31..39 from 60 = minutes
      }

      if (now.minute() != 15 && now.minute() != 45 && now.minute() != 30) {
        if (now.minute() == 1 || now.minute() == 59)
          minx(); // minute. - singular
        else
          mins(); // minutes - plural
      }
      if (now.minute() < 30) pst(); // before half
      if (now.minute() > 30) { // after half
        if (now.minute() == 45) // quarter (hour)
          til(); // shortened 'til
        else
          utl(); // until
      }
      if ((now.minute() != 15) && (now.minute() != 45)) { // exclude "quarter" hours
        if (now.minute() > 40) showMin(60 - now.minute()); // minutes 41 to 59 "until"
        if (now.minute() < 20) showMin(now.minute()); // minutes 1 to 19 "past"
      } else if ((now.minute() == 15) || (now.minute()) == 45)
        qrtr(); // 15 "quarter"
    }

    // MAKE 12-HOUR CLOCK - replace two checks on now.hour() == 11 and now.hour() == 23
    // int tHour = (now.hour() < 13) ? now.hour() : now.hour() - 12;

    // PAST (the hour) and UNTIL (the hour)
    if (now.minute() > 30)
      showHour(now.hour() + 1); // add an hour if "until the hour"
    else
      showHour(now.hour());

    // MIDNIGHT (0 or 24) and NOON (12)
    if (now.hour() == 0 && !(now.minute() > 30))
      showHour(0); // "midnight"
    else if (now.hour() == 12 && !(now.minute() > 30))
      showHour(12); // "noon"

    // O'CLOCK not after NOON and MIDNIGHT
    if (!((now.minute() > 30 && (now.hour() == 11 || now.hour() == 23) || // 31 TO 59
           (now.minute() < 30 && (now.hour() == 12 || now.hour() == 0))))) { // 1 TO 29
      ocl(); // o'clock
    }

    // AM or PM (ANTE MERIDIAM / POST MERIDIAM) following O'CLOCK
    if (now.hour() > 12 && !(now.minute() > 30 && now.hour() == 23)) // no PM at NOON
      pm();
    else if (now.hour() < 12 && !(now.minute() > 30 && now.hour() == 11)) {
      am();
    }
  }
}