// Demonstrates one double height display using Parola using a single font file
// defintion created with the MD_MAX72xx font builder.
//
// Each font file has the lower part of a character as ASCII codes 0-127 and the
// upper part of the character in ASCII code 128-255. Adding 128 to each lower
// character creates the correct index for the upper character.
// The upper and lower portions are managed as 2 zones 'stacked' on top of each other
// so that the module numbers are in the sequence shown below:
//
// * Modules (like FC-16) that can fit over each other with no gap
//  n n-1 n-2 ... n/2+1   <- this direction top row
//  n/2 ... 3  2  1  0    <- this direction bottom row
//
// * Modules (like Generic and Parola) that cannot fit over each other with no gap
//  n/2+1 ... n-2 n-1 n   -> this direction top row
//  n/2 ... 3  2  1  0    <- this direction bottom row
//
// Sending the original string to the lower zone and the modified (+128) string to the
// upper zone creates the complete message on the display.
//
// MD_MAX72XX library can be found at https://github.com/MajicDesigns/MD_MAX72XX
//

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include "Font_Data.h"

// Hardware adaptation parameters for scrolling
textEffect_t scrollUpper, scrollLower;

// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers may not work with your hardware and may need changing
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define NUM_ZONES 2
#define ZONE_SIZE 12
#define MAX_DEVICES (NUM_ZONES * ZONE_SIZE)

#define ZONE_UPPER  1
#define ZONE_LOWER  0

#define PAUSE_TIME 2000
#define SCROLL_SPEED 20

#define CLK_PIN   13
#define DATA_PIN  11
#define CS_PIN    3

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

const char *msgL[] =
{
  "3 months, 25 days, 22 hours",
};
char *msgH; // allocated memory in setup()

void setup(void)
{
  uint8_t max = 0;
  // set up global parameters

  // work out the size of buffer required
  for (uint8_t i = 0; i<ARRAY_SIZE(msgL); i++)
    if (strlen(msgL[i]) > max) max = strlen(msgL[i]);

  msgH = (char *)malloc(sizeof(char)*(max + 2));

  // initialise the LED display
  P.begin(NUM_ZONES);

  // Set up zones for 2 halves of the display
  P.setZone(ZONE_LOWER, 0, ZONE_SIZE - 1);
  P.setZone(ZONE_UPPER, ZONE_SIZE, MAX_DEVICES-1);
  P.setFont(BigFont);
  P.setCharSpacing(P.getCharSpacing() * 2); // double height --> double spacing
}

void createHString(char *pH, const char *pL)
{
  for (; *pL != '\0'; pL++)
    *pH++ = *pL | 0x80;   // offset character

  *pH = '\0'; // terminate the string
}

void loop(void)
{
  static uint8_t cycle = 0;

  P.displayAnimate();

  if (P.getZoneStatus(ZONE_LOWER) && P.getZoneStatus(ZONE_UPPER))
  {
    // set up the string
    createHString(msgH, msgL[cycle]);

    P.displayClear();
      P.displayZoneText(ZONE_LOWER, msgL[cycle], PA_LEFT, SCROLL_SPEED, PAUSE_TIME, PA_SCROLL_LEFT, PA_WIPE_CURSOR );
      P.displayZoneText(ZONE_UPPER, msgH, PA_LEFT, SCROLL_SPEED, PAUSE_TIME, PA_SCROLL_LEFT, PA_WIPE_CURSOR );

    // prepare for next pass
    cycle = (cycle + 1) % ARRAY_SIZE(msgL);

    // synchronize the start and run the display
    P.synchZoneStart();
  }
}