/*
 * Use of MAX72XX, (TFT)DS1307 components to 
 * print some information on the display.
 *
 * for more examples:
 * https://github.com/MajicDesigns/MD_Parola/tree/main/examples
 * https://github.com/MajicDesigns/MD_MAX72XX/tree/main/examples
 */

// Header file includes
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <Wire.h>
#include "Font7Seg.h"

// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers will probably not work with your hardware and may
// need to be adapted
#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 4 // Define the number of displays connected
#define CLK_PIN    18 // CLK or SCK
#define DATA_PIN   21 // DATA or MOSI
#define CS_PIN     5 // CS or SS
#define SPEED_TIME 75 // Speed of the transition
#define PAUSE_TIME  0
#define MAX_MESG   20

// These are for the clock
#define DS1307_ADDRESS 0x68

// Global variables
uint8_t wday, mday, month, year;
uint8_t hours, minutes, seconds;

char szTime[9];    // mm:ss\0
char szMesg[MAX_MESG + 1] = "";

uint8_t clear = 0x00;

// Hardware SPI connection
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

void beginDS1307()
{
  // Read the values ​​(date and time) of the DS1307 module
  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);
  wday = bcdToDec(Wire.read());
  mday = bcdToDec(Wire.read());
  month = bcdToDec(Wire.read());
  year = bcdToDec(Wire.read());
}

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

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

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

// Code for reading clock date
void getDate(char *psz)
{
  char  szBuf[10];
  sprintf(psz, "%d %s %04d", mday , mon2str(month, szBuf, sizeof(szBuf) - 1), (year + 2000));
}

void getText(char *psz)
{
  sprintf(psz, "Gewaechshaus  -  EZE YANNICK");
}





// Get a label from PROGMEM into a char array
char *mon2str(uint8_t mon, char *psz, uint8_t len)
{
  static const __FlashStringHelper* str[] =
  {
    F("Januar"), F("Februar"), F("Maerz"), F("April"),
    F("Mai"), F("Juni"), F("Juli"), F("August"),
    F("September"), F("Oktober"), F("November"), F("Dezember")
  };

  strncpy_P(psz, (const char PROGMEM *)str[mon - 1], len);
  psz[len] = '\0';

  return (psz);
}

char *dow2str(uint8_t code, char *psz, uint8_t len)
{
  static const __FlashStringHelper* str[] =
  {
    F("Sonntag"), F("Montag"), F("Dienstag"),
    F("Mittwoch"), F("Donnerstag"), F("Freitag"),
    F("Samstag")
  };

  strncpy_P(psz, (const char PROGMEM *)str[code - 1], len);

  psz[len] = '\0';

  return (psz);
}

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; // Memory (ms)
  static uint8_t  display = 0;  // Current display mode
  static bool flasher = false;  // Seconds passing flasher

  beginDS1307();

  P.displayAnimate();

  if (P.getZoneStatus(0))
  {
    switch (display)
    {
    case 0:
      P.setFont(0, nullptr);
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
      display++;
      getText(szMesg);

      break;

    case 1: // 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;
      }
      if ((seconds == 00) && (seconds <= 30)) {
        display++;
        P.setTextEffect(0, PA_PRINT, PA_WIPE_CURSOR);
      }
      break;

    case 2: // Day of week
      P.setFont(0, nullptr);
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
      display++;
      dow2str(wday, szMesg, MAX_MESG);
      break;

    default: // Calendar
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
      display = 0;
      getDate(szMesg);
      break;
      
    }

    P.displayReset(0); // Rest zone zero
  }
}