//Librairy
#include <RTClib.h>
#include <Wire.h>
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <Font_Data.h>

// MAX7219 setup :
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 4
#define CLK_PIN   13
#define DATA_PIN  11
#define CS_PIN    10

// Brightness setup
const int buttonLess = 2;
const int buttonPlus = 3;
const int maxBrightness = 15;
int Brightness = maxBrightness;
int interval = 1;

//Menu setup
const int setMenu = 4;
int menu = 0;


// MD_Parola Setup
MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);
char Time[8];          // Actual Time (hh:mm:ss)

// RTC setup :
RTC_DS3231 RTC; // Establish clock object
DateTime Clock; // Holds current clock time
byte hourval, minuteval, secondval;

void setup() {

  Serial.begin(9600);
  Wire.begin();  // Begin I2C
  RTC.begin();   // Begin clock
  P.begin();     // Begin Max7219
  P.setIntensity(0); // Intensité de l'écran minimum au démarrage

   //Brightness
  pinMode(buttonLess, INPUT);
  pinMode(buttonPlus, INPUT);
  pinMode(setMenu, INPUT);

}

void loop()
{
  // check if you press the SET button and increase the menu index
  if (digitalRead(setMenu) == HIGH)
  {
    menu = menu+1;
  }

  // in wich subroutine should we go ?
  if (menu==0)
  {
    DisplayDateTime(); // void DisplayDateTime
  }

  if (menu==1)
  {
    DisplaySetBrightness();
  }

  if (menu == 2)
  {
    menu=0;
  }
  delay(100);
}

void DisplayDateTime()
{
  // We show the current time

  Clock = RTC.now(); // get the RTC time
  secondval = Clock.second();  // get seconds
  minuteval = Clock.minute();  // get minutes
  hourval = Clock.hour();      // get hours

  // RTC values for the MAX7219 Matrix :
  DateTime now = RTC.now();

  // Messages displayed ont the MAX7219 Matrix :
  sprintf(Time, "%2d%c%02d%c%02d", now.hour(), ':', now.minute(), ':', now.second());

  P.setFont(0, numeric7Se);
  P.displayText(Time, PA_CENTER, 0, 0, PA_PRINT, PA_NO_EFFECT);
  P.displayAnimate();

void DisplaySetBrightness()
{
  P.setfont(0, numeric7Se);
  P.displayText("Brightness", PA_CENTER, 0, 0, PA_PRINT, PA_NO_EFFECT);
  P.displayAnimate();

  if (digitalRead(buttonLess) == HIGH && Brightness > 0)
  {Brightness = Brightness - interval;}

  if (digitalRead(buttonPlus) == HIGH && Brightness < maxBrightness)
  {Brightness = Brightness + interval;}

  delay(100);

  P.setIntensity(Brightness);
}