// Christopher Ackerman
// AE598 Assignment 4 - Arduino Simulatio with SD Card

#include <SD.h>

#define CS_PIN 10

File root;
int ledPin = 8;

String filename = "arduino.txt";

File myFile;
int myInt = -52;
float myFloat = -12.7;
String myString = "HELLO";
char myCharArray[] = "ArduinoGetStarted.com";
byte myByteArray[] = {'1', '2', '3', '4', '5'};

int knob;

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

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

  if (!SD.begin(CS_PIN)) {
    Serial.println("Card initialization failed!");
    while (true);
  }

  Serial.println("initialization done.");

  Serial.println("Files in the card:");
  root = SD.open("/");
  printDirectory(root, 0);
  Serial.println("");

  // Example of reading file from the card:
  File textFile = SD.open("wokwi.txt");
  if (textFile) {
    Serial.print("wokwi.txt: ");
    Serial.println("");
    while (textFile.available()) {
      Serial.write(textFile.read());
    }
    textFile.close();
  } else {
    Serial.println("error opening wokwi.txt!");
  }

// set the pin for the LED
pinMode(ledPin, OUTPUT);

// create new file by opening file for writing
myFile = SD.open(filename, FILE_WRITE);

if (myFile) {
  Serial.println("file opened");
  Serial.println("test");
  Serial.println(myCharArray);
  Serial.write(myByteArray, 5);

  myFile.println("test");
  myFile.println(myCharArray);
  myFile.write(myByteArray, 5);

for (int i = 0; i < 5; i++) {
  myFile.write(myByteArray[i]);

  if (i < 4)
  myFile.write(".");
}
myFile.write("/n");

// Write a set of data to the file and flash the LED
// Run the LED and knob for 10 cycles
for (int k = 1; k < 10; k++) {
  knob = analogRead(A0);
  myFile.println(knob);

  Serial.print("knob value = ");
  Serial.println(knob);

  digitalWrite(ledPin, HIGH);
  delay(knob);
  digitalWrite(ledPin, LOW);
  delay(knob);
}

myFile.close();
Serial.println("data written");
Serial.println("");
} else {
  Serial.print(F("SD Card: error on opening file arduino.txt"));
}

  myFile = SD.open(filename);

  if (myFile) {
    Serial.print(filename);
    Serial.println(": opened");

    while (myFile.available()) {
Serial.write(myFile.read());
    }
    myFile.close();
  } else {
    Serial.println("error openinf file for reading!");
  }
  Serial.println("file reading complete");

}

void loop() {
  int knob = analogRead(A0);

  Serial.println(knob);
  digitalWrite(ledPin, HIGH);
  delay(knob);
  digitalWrite(ledPin, LOW);
  delay(knob);
}

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();
  }
}