#include "SdFat.h"

#define SPI_SPEED SD_SCK_MHZ(4)
#define CS_PIN 10

SdFat sd;
File dir;
File file;




String getFileName(byte i) {
  /*
    Returns a filename.
    if i = 1 it returns the first file
    if i = 2 it returns the second file name
    if i = 3 ... see what I did here?
  */
  int fileCount = 0;
  String result = "";
  char buf[32];

  // Open root directory
  if (!dir.open("/")) {
    // error("dir.open failed");
  }

  while (file.openNext(&dir, O_READ)) {
    if (!file.isHidden()) {
      fileCount++;
      if(fileCount == i){
        file.getName(buf, sizeof(buf)); 
        result = String(buf);
      }
    }
    file.close();
  }


  dir.close();
  if (dir.getError()) {
    Serial.println("openNext failed");
  } else {
    Serial.println("Done!");
  }

  return result;
}



String getBlockName(String filename) {
  uint8_t index = filename.indexOf(".");
  return filename.substring(0, index);
}

String getBlockNameById(byte i) {
  String name = getFileName(i);
  return getBlockName(name);
}


byte filecount() {
  /*
    Count the number of files on the SD card.
  */

  // Open root directory
  if (!dir.open("/")) {
    // error("dir.open failed");
  }
    int fileCount = 0;

  while (file.openNext(&dir, O_READ)) {
    if (!file.isHidden()) {
      fileCount++;
    }
    file.close();
  }
  dir.close();
  return fileCount;
}



void setup() {
  Serial.begin(115200);
  if (!sd.begin(CS_PIN, SPI_SPEED)) {
    // if (sd.card()->errorCode()) {
    //   Serial.println("SD initialization failed.");
    // } else if (sd.vol()->fatType() == 0) {
    //   Serial.println("Can't find a valid FAT16/FAT32 partition.");
    // } else {
    //   Serial.println("Can't determine error type");
    // }
    return;
  }

  Serial.println("Files on card:");
  Serial.println("   Size    Name");

  sd.ls(LS_R | LS_SIZE);

  Serial.println(filecount());

  // Serial.println(getFileName(0));
  Serial.println(getFileName(1));
  Serial.println(getFileName(2));
  Serial.println(getFileName(3));
  Serial.println(getFileName(4));
}

void loop() {
}