// https://forum.arduino.cc/t/bool-array-memory-usage/1440561

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

// calculated pixels
#define DIGIT    4 // 12:34     digits per display
#define SEGMENT  7 // ABCDEFG   segments per digit
#define SEGPIX   9 // 000000000 pixels per segment
#define COLON    2 // :         colon dots
#define DIGPIX   SEGMENT * SEGPIX // pixels per digit

#define NUMPIX    DIGIT * SEGMENT * SEGPIX + COLON
#define DATAPIN   12
#define MAXBRIGHT 255
CRGB led[NUMPIX];

#include <RTClib.h>
RTC_DS1307 rtc;

int digCount, segCount, segPix, colon;
int hours, minutes, seconds, oldSeconds;

void setup() {
  Serial.begin(115200);

  rtc.begin();
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // setTime(h, m, s, d, mm, yyyy);

  FastLED.addLeds<WS2812B, DATAPIN, GRB>(led, NUMPIX);
  FastLED.setBrightness(MAXBRIGHT);
  FastLED.clear();
  FastLED.show();
}

void loop() {
  DateTime now = rtc.now(); // "now" is local to loop()
  hours = now.hour();
  minutes = now.minute();
  seconds = now.second();
  if (seconds != oldSeconds) {
    oldSeconds = seconds;
    clock();
    // showpixels(255 * random(2), 255 * random(2), 255 * random(2));
    // showsegments(255, 0, 0);
  }
}

void clock() {
  int hours_tens = hours / 10;
  int hours_unit = hours % 10;
  int minutes_tens = minutes / 10;
  int minutes_unit = minutes % 10;
  
  Serial.print(hours_tens);
  Serial.print(hours_unit);
  Serial.print(":");
  Serial.print(minutes_tens);
  Serial.print(minutes_unit);
  Serial.println();
}

void showsegments(int red, int grn, int blu) {
  if (segCount == SEGMENT) {
    segCount = 0;
    digCount++;
    if (digCount > 1) {
      colon = 2; // add two pixels for colon
    }
    if (digCount == DIGIT) {
      digCount = 0;
      colon = 0;
      FastLED.clear();
      FastLED.show();
    }
  }

  for (int segPix = 0; segPix < SEGPIX; segPix++) { // segment pixels
    led[(digCount * DIGPIX) + (segCount * SEGPIX) + segPix + colon] = CRGB(red, grn, blu); // individual pixels
  }
  FastLED.show(); // show after segment is in buffer
  segCount++;
}

void showpixels(int red, int grn, int blu) {
  for (int i = 0; i < NUMPIX; i++) {
    led[i] = CRGB(red, grn, blu);
    delay(10);
    FastLED.show();
  }
  delay(2000);
  FastLED.clear();
  FastLED.show();
}