#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <Wire.h>
#include "Font7Seg.h"

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 4 
#define CLK_PIN    13 
#define DATA_PIN   11 
#define CS_PIN     10
#define SPEED_TIME 75 
#define PAUSE_TIME  0
#define MAX_MESG   20

#define DS1307_ADDRESS 0x68

uint8_t hours, minutes, seconds;

char szTime[9];
char szMesg[MAX_MESG + 1] = "";

uint8_t clear = 0x00;

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

void beginDS1307()
{
  Wire.beginTransmission(DS1307_ADDRESS);
  Wire.write(clear);
  Wire.endTransmission();
  Wire.requestFrom(DS1307_ADDRESS, 0x07);

  seconds = bcdToDec(Wire.read());
  minutes = bcdToDec(Wire.read());
  hours = bcdToDec(Wire.read() & 0xff);
}

uint8_t decToBcd(uint8_t value)
{
  return ((value / 10 * 16) + (value % 10));
}

uint8_t bcdToDec(uint8_t value)
{
  return ((value / 16 * 10) + (value % 16));
}

void getTime(char *psz, bool f = true)
{
  sprintf(psz, "%02d%c%02d", hours, (f ? ':' : ' '), minutes);
}


void setup(void)
{
  Wire.begin();

  P.begin(2);
  P.setInvert(false);

  P.setZone(0,  MAX_DEVICES - 4, MAX_DEVICES - 1);
  P.setZone(1, MAX_DEVICES - 4, MAX_DEVICES - 1);

  P.displayZoneText(1, szTime, PA_CENTER, SPEED_TIME, PAUSE_TIME, PA_PRINT, PA_NO_EFFECT);
  P.displayZoneText(0, szMesg, PA_CENTER, SPEED_TIME, 0, PA_PRINT , PA_NO_EFFECT);

}

void loop(void)
{
  static uint32_t lastTime = 0; 
  static uint8_t  display = 0;  
  static bool flasher = false;

  beginDS1307();
  P.displayAnimate();

  if (P.getZoneStatus(0))
  {
    switch (display)
  {
    case 0: // Clock
      P.setFont(0, numeric7Seg);
      P.setTextEffect(0, PA_PRINT, PA_NO_EFFECT);
      P.setPause(0, 0);

      if ((millis() - lastTime) >= 1000)
      {
        lastTime = millis();
        getTime(szMesg, flasher);
        flasher = !flasher;
      }
    }
    P.displayReset(0); 
  
}
}