#include <SPI.h>
#include <SdFat.h>
#include <SdFatUtil.h>
#include <SFEMP3Shield.h>
#include <Time.h>  

SdFat sd;
SFEMP3Shield MP3player;
uint8_t result;

int last = 0, total_files = 0;
char* file_name[50] = {};
char string[50] = "";
      
void setup()
{
delay(2000);

  Serial.begin(9600);

  if(!sd.begin(SD_SEL, SPI_FULL_SPEED)) sd.initErrorHalt();
  if(!sd.chdir("/")) sd.errorHalt("sd.chdir");

  MP3player.begin();

  MP3player.setVolume(2, 2);
  MP3player.setMonoMode(0);
  MP3player.setEarSpeaker(0);
  
  total_files = list_files();
  
  Serial.print("Total files : ");
  Serial.println(total_files);
  Serial.println();
}

void loop()
{
  if(!MP3player.isPlaying())
  {
    randomSeed(millis());
    int randNumber = random(1, total_files);

    if(last != randNumber)
    {
      last = randNumber;
      sprintf(string, "track%d.mp3", randNumber);

      MP3player.playMP3(string, 0);
      
    show_played();
    }
  }
}

int list_files(void)
{
  SdFile file;
  sd.chdir("/",true);
  int count = 1;
  char filename[15];

    while (file.openNext(sd.vwd(),O_READ))
    {
        count++;
        file.close();
    }

return(count);
}

void show_played(void)
{
  char title[20];
  char artist[20];
  char album[20];

  MP3player.trackTitle((char*)&title);
  MP3player.trackArtist((char*)&artist);
  MP3player.trackAlbum((char*)&album);

  Serial.print("Title :   ");
  Serial.write((byte*)&title, 20);
  Serial.println();
  Serial.print("By : ");
  Serial.write((byte*)&artist, 20);
  Serial.println();
  Serial.print("Album : ");
  Serial.write((byte*)&album, 20);
  Serial.println();
  Serial.println();
}