//A test file to see if I can combine libraries and example code for 
// - reading an SD card (from https://www.arduino.cc/en/Tutorial/listfiles)
// - diplaying text on an LCD screen (from openGLCD Library - Hello World sketch)
//
//Andrew Sleigh
//2018-04-20
//

// * SD card attached to SPI bus as follows:
// ** MOSI - pin 11
// ** MISO - pin 12
// ** CLK - pin 13
// ** CS - varies, see below

// SD card setup
#include <SPI.h>
#include <SD.h>
File root;
String fileList = "Blah";

// LCD screen setup
#include <openGLCD.h>


void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only

  // Initialize the GLCD 
  GLCD.Init();

 // Select the font for the default text area
  GLCD.SelectFont(System5x7);    
  }


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

  if (!SD.begin(12)) {
    Serial.println("initialization failed!");
    while (1);
  }
  Serial.println("initialization done.");

  root = SD.open("/");

  printDirectory(root, 0);
  
  Serial.println("done!");  
}


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

void printDirectory(File dir, int numTabs) {
  // loop through all the files in the root directory
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
      
    // I only want it to print directories, not files
    if (entry.isDirectory()) {
      //  Serial.println("/");

     for (uint8_t i = 0; i < numTabs; i++) {
        Serial.print('\t');
      }
      
      // entry.name() is the title of each file or folder it finds
      Serial.println(entry.name());
      // Also print it to the LCD screen
      GLCD.println(entry.name()); 
     
      // this loop recursively goes through directories and also prints what it finds inside
      // I don't want this, so comment it out
      // printDirectory(entry, numTabs + 1);
   
    } else {
      // ignore files
    }
    entry.close();
  }
}