//legend :)
//DO  -> 19 = MISO
//SCK -> 18 = CLOCK
//DI  -> 23 = MISO
//CS = Chip select -> ?


//-----------------------using SdFat-------------------
#include "SdFat.h"
#define SPI_SPEED SD_SCK_MHZ(4)
#define CS_PIN 32

SdFat sd;

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");
  //recursively display all files in directory and subdirectories with their size - included in FAT library
  sd.ls(LS_R | LS_SIZE);
}

void loop() {
}
//---------------------------------------------------


//-----------------------using SD library--------------------
// #include <SD.h>
// #define MAX_FILENAME_SIZE 50
// #define CS_PIN 32

// File root;

// void setup() {
//   Serial.begin(115200);

//   //initializing SD card

//   if (!SD.begin(CS_PIN)) {
//     Serial.println("Card initialization failed!");
//     while (true);
//   }
//   Serial.println("initialization done. Files in the card:");
//   root = SD.open("/");
//   //iterate through directories and files
//   printDirectory(root, 0);

//   // Example of reading file from the card:
  
// }

// void loop() {
//   delay(100);
//   // nothing happens after setup finishes.
// }

// void printDirectory(File dir, int numTabs) {
//   while (true) {
//     File entry =  dir.openNextFile();
//     if (! entry) {
//       // no more files
//       break;
//     }
//     for (uint8_t i = 0; i < numTabs; i++) {
//       Serial.print('\t');
//     }
//     //getting name of file to prepare txt check
//     Serial.print(entry.name());
//     char filename[MAX_FILENAME_SIZE];
//     strcpy(filename,entry.name());

//     if (entry.isDirectory()) {
//       Serial.println("/");
//       printDirectory(entry, numTabs + 1);
//     } else {
//       // files have sizes, directories do not
//       Serial.print("\t\t");
//       Serial.print(entry.size(), DEC);
//       if(isTextFile(filename)){
//         Serial.print("\t\t");
//         Serial.println("this is a text file");
//         readTextFile(entry, filename);
//       }else{
//         Serial.println("");
//       }
      
//     }
//     entry.close();
//   }
// }

// void readTextFile(File textFile, char* filename){
//   if (textFile) {
//     Serial.println(filename);
//     while (textFile.available()) {
//       Serial.write(textFile.read());
//     }
//     textFile.close();
//     String result = String(filename);

//     Serial.println("Finished printing " + result);
//   } else {
//     Serial.println("error opening file!");
//   }
// }

// bool isTextFile(char* filename) {
//   int8_t len = strlen(filename);
//   bool result;
//   if ( strstr(strlwr(filename + (len - 4)), ".txt")
//      // and anything else you want
//     ) {
//     result = true;
//   } else {
//     result = false;
//   }
//   return result;
// }

//--------------------------------------------------