#include <SD.h>
#include <SPI.h>

#define pushButton 2
#define pinCS 10
#define configName "config.txt"
#define fileTitle "test"
#define fileExtension ".txt"

String fullFileName = fileTitle;

File root;
bool buttonState = false;

// Function to write to file
bool writeFile(String fileName, String data);
// Function to read to file
String readFile(String fileName);
//
void updateConfig(String configfileName);
//
void printDirectory(File dir, int numTabs);


void setup() {
  Serial.begin(9600);

  pinMode(pushButton, INPUT_PULLUP);

  SD.begin(pinCS);

  //
  updateConfig(configName);
  
  fullFileName += "_" + readFile(configName) + fileExtension;
  writeFile(fullFileName, "Testing 1, 2, 3.\n");

  // Serial.println(readFile(configName));

  // Serial.println(readFile(fullFileName));
}

void loop() {
  if (!buttonState && digitalRead(pushButton) == LOW) {
    root = SD.open("/");
    if (root) {
      printDirectory(root, 0);
    } else { Serial.println("not root"); }

    buttonState = true;

    Serial.println("Ok push button.");
  } else if (digitalRead(pushButton) == HIGH) {
    buttonState = false;
  }

  delay(100);
}


// Function to write to file
bool writeFile(String fileName, String data) {
  File myFile = SD.open(fileName, FILE_WRITE);
  if (myFile) {
    myFile.print(data);
    myFile.close();
    return 0;
  } else {
    Serial.print("Error opening file for writing: ");
    Serial.println(fileName);
    return 1;
  }
}

// Function to read to file
String readFile(String fileName) {
  String data;
  File myFile = SD.open(fileName, FILE_READ);
  if (myFile) {
    while (myFile.available()) {
      data += (char)myFile.read();
    }
    myFile.close();
    return data;
  } else {
    Serial.print("Error opening file for reading: ");
    Serial.println(fileName);
    return "";
  }
}

//
void updateConfig(String configFileName) {
  String data = readFile(configFileName);
  if (data == "") {
    writeFile(configFileName, "0");
  } else {
    SD.remove(configFileName);
    writeFile(configFileName, String(data.toInt()+1));
  }
}

// NO USING
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');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}