#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <RTClib.h>

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 4

#define DATA_PIN 11
#define CLK_PIN 13
#define CS_PIN 10

MD_Parola display(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);
RTC_DS1307 rtc;

// ===== BUFFER =====
char line1[20];
char line2[10];
char line3[30];

bool blink = false;
unsigned long lastUpdate = 0;

const char* hari[] = {
  "MINGGU","SENIN","SELASA","RABU",
  "KAMIS","JUMAT","SABTU"
};

const char* bulan[] = {
  "","JAN","FEB","MAR","APR","MEI","JUN",
  "JUL","AGS","SEP","OKT","NOV","DES"
};

// ================= SETUP =================
void setup() {
  display.begin();
  display.setFont(nullptr);     // FONT KECIL STABIL
  display.setIntensity(6);
  display.displayClear();

  rtc.begin();

  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

// ================= LOOP =================
void loop() {
  display.displayAnimate();

  if (millis() - lastUpdate >= 500) {
    lastUpdate = millis();
    showHMI();
  }
}

// ================= HMI DISPLAY =================
void showHMI() {
  DateTime now = rtc.now();

  blink = !blink;

  // ===== BARIS 1: JAM BESAR =====
  sprintf(line1, "%02d:%02d", now.hour(), now.minute());

  // ===== BARIS 2: DETIK KECIL =====
  sprintf(line2, "%c%02d", blink ? ':' : ' ', now.second());

  // ===== BARIS 3: TANGGAL + HARI =====
  sprintf(line3, "%s %02d %s",
          hari[now.dayOfTheWeek()],
          now.day(),
          bulan[now.month()]);

  // ===== DISPLAY 1: JAM =====
  display.displayText(
    line1,
    PA_CENTER,
    0,
    0,
    PA_PRINT,
    PA_NO_EFFECT
  );

  delay(50);

  // ===== DISPLAY 2: DETIK =====
  display.displayText(
    line2,
    PA_RIGHT,
    0,
    0,
    PA_PRINT,
    PA_NO_EFFECT
  );

  delay(50);

  // ===== DISPLAY 3: TANGGAL =====
  display.displayText(
    line3,
    PA_CENTER,
    0,
    0,
    PA_PRINT,
    PA_NO_EFFECT
  );
}