// Thu vien module RTC
#include <Wire.h>
#include <RTClib.h>

//LED Ma tran
#include <MD_MAX72xx.h>
#include <MD_Parola.h>
#include <SPI.h>

RTC_DS1307 rtc;

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 4
#define CS_PIN 10

MD_Parola matrix = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

const unsigned long eventInterval = 20000;
unsigned long previousTime = 0;

void setup() {
  while (!Serial);

  Serial.begin(57600);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  matrix.begin();
  matrix.setIntensity(0);
  matrix.displayClear();
}

void loop() {
  unsigned long currentTime = millis();
  DateTime now = rtc.now();

  String timeHour = String (now.hour(), DEC); //+1 HT gio
  int int_timeHour = timeHour.toInt();

  String timeMinute = String (now.minute(), DEC); // lay so phut
  int int_timeMinute = timeMinute.toInt();

  //kiem tra 
  if ((int_timeHour == 0) || (int_timeHour > 0) && (int_timeHour < 10)) {
    timeHour = "0" + String (now.hour()+1, DEC);
  }

  if ((int_timeMinute == 0) || (int_timeMinute > 0) && (int_timeMinute < 10)) {
    timeMinute = "0" + String (now.minute(), DEC);
  }

  String timeDisplay = timeHour + ":" + timeMinute; // hien thi thơi gian ln man hình led
  char char_timeDisplay[timeDisplay.length() + 1];
  timeDisplay.toCharArray(char_timeDisplay, timeDisplay.length() + 1);

  String dateDisplay = String (now.day(), DEC) + " : " + String (now.month(), DEC); //hien thi ngay, thang
  char char_dateDisplay[dateDisplay.length() + 1];
  dateDisplay.toCharArray(char_dateDisplay, dateDisplay.length() + 1);

  matrix.setTextAlignment(PA_CENTER);
  matrix.print(char_timeDisplay);

  delay(500);

  if (currentTime - previousTime >= eventInterval) {
    matrix.print(char_dateDisplay);
    delay(5000);

    previousTime = currentTime;
  }

  timeDisplay = timeHour + " " + timeMinute;
  char_timeDisplay[timeDisplay.length() + 1];
  timeDisplay.toCharArray(char_timeDisplay, timeDisplay.length() + 1);

  matrix.print(char_timeDisplay);
  delay(500);
/*
  Serial.print(now.day(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.year(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(now.hour() + 1, DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();

  Serial.print(" since midnight 1/1/1970 = ");
  Serial.print(now.unixtime());
  Serial.print("s = ");
  Serial.print(now.unixtime() / 86400L);
  Serial.println("d");

  DateTime future (now + TimeSpan(7, 12, 30, 6));

  Serial.print(" now + 7d + 30s: ");
  Serial.print(future.day(), DEC);
  Serial.print('/');
  Serial.print(future.month(), DEC);
  Serial.print('/');
  Serial.print(future.year(), DEC);
  Serial.print(' ');
  Serial.print(future.hour(), DEC);
  Serial.print(':');
  Serial.print(future.minute(), DEC);
  Serial.print(':');
  Serial.print(future.second(), DEC);
  Serial.println();

  Serial.println();
  delay(500);

  timeDisplay = timeHour + " " + timeMinute;
  char_timeDisplay[timeDisplay.length()+1];
  timeDisplay.toCharArray(char_timeDisplay,timeDisplay.length()+1);

  matrix.print(char_timeDisplay);
*/
}