// SD_test.ino file  11/2/2024

#include <SD.h>   // include the SD libary

  // set variables needed for SD card
  File root;
  String FileNames[250];
  String NewFileNames[250];
  int m=0;
  int mm=0;                                                   
  int fileCountOnSD=0;

  const int chipSelect = 53;  //set this to what pin you are using
  const int beepers = 46;     // beeper pin

void setup() {

    Serial.begin(115200);         // start serial for serial monitor
    pinMode(beepers, OUTPUT);     //make beeper pin outpu
    digitalWrite (beepers, LOW);  // set beeper to low so it doesn't keep beeping on startup

}

void loop() {
        
    beeper(1000);       // indicate that we are starting with a beep

    ReadSD();       // subroutine that initializes the SD card and reads its content into FileNames[] and prints file and size

    PrintNamer();   // print out raw names of all files in FileNames[]

    FileCleaner();  // print out only files that end with .TXT and put in array NewFileNames[] - only want track files

    Serial.print("finished setup, number of track files= ");
    Serial.println(fileCountOnSD);
    
    beeper(3000);       // indicate that we are done with a long beep

    while(1);     // stop the program from repeating and just sit there

}
//******************************************************************************************************
void ReadSD()
{
  while (!Serial);

  Serial.print("Initializing SD card...");

// initialize SD card and print out if there is a problem
  if (!SD.begin(chipSelect)) {
    Serial.println("initialization failed. Things to check:");
    Serial.println("1. is a card inserted?");
    Serial.println("2. is your wiring correct?");
    Serial.println("3. did you change the chipSelect pin to match your shield or module?");
    Serial.println("Note: press reset button on the board and reopen this Serial Monitor after fixing your issue!");
    while (true);  //  oops, there was a problem so stop here and wait 
  }

  root = SD.open("/");  // open card and read contents 

  printDirectory(root, 0);  // print out contents using printDirectory routine

  root.close();  // close the card

    Serial.println("initialization done.");  // let you know it is done reading contents
}

//******************************************************************************************************

void PrintNamer()   // print out names of files that are stored in FileNames[]
{
  for (int m=0; m<=fileCountOnSD; m++)  // fileCountOnSD contains the number of files read on the SD card established in printDirectory routine
          {
            Serial.print(m);              // print out number of the file
            Serial.print("-----");        // just a bit of space
            Serial.println(FileNames[m]); // print out the filename in array
          }
}

//**********************************************************************************************************

void FileCleaner()    // Select files on SD card that are .txt files only and put in array NewFileNames[]
{
  mm=0;   // set counter to zero

   for (int m=0; m<=fileCountOnSD; m++)   // go through files one at a time and select .txt files
   {
      if(FileNames[m].endsWith("TXT"))    // select .txt files only
          {
            NewFileNames[mm]=FileNames[m];  //put file into NewFileNames[] if it is a .txt file
            mm++;   // increment counter
          }
    }
    Serial.println("  ");   // print out a space on serial monitor
    fileCountOnSD=mm-1;     // correct fieCountOnSD to reflect number of files that are in NewFileNames[]

    for (int m=0; m<=fileCountOnSD; m++)   // print out files in NewFileNames[]
       {
        Serial.print(m);                  // print number of file
        Serial.print("     ");            // print space
        Serial.println(NewFileNames[m]);  // print out each file name
       }
}


//**************************************************************************************************************
void beeper(int duration)
{
digitalWrite (beepers, HIGH);     // set beeper to on
delay(duration);                  // wait a time in ms for beeper to beep
digitalWrite (beepers, LOW);      // turn off beeper
}

//***************************************************************************************************************

void printDirectory(File dir, int numTabs) 
{
m=0;              // zero out m
fileCountOnSD=0;  // sero out fileCountOnSD
while (true)   // keep going until you get to break
{    
    File entry =  dir.openNextFile();   // get next file
          Serial.print("   ");          // print a space on serial monitor

          FileNames[m]=entry.name();    // put file name into array FileNames[]
              fileCountOnSD++;          // increment fileCountOnSD
          m=m+1;                        // increment m
      if (! entry) {                    // if your reached the end, break out
      break;                            // break out of while loop
      }

    entry.close();    // close the SD card
  }
}

//*****************************************************************************************************************