#include <SD.h>

#define CS_PIN 10

File root;
int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = HIGH;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status


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("");

  //Reading file from the card:
  File textFile = SD.open("wokwi.txt");
  if (textFile) {
    Serial.print("wokwi.txt: ");
    while (textFile.available()) {
      Serial.write(textFile.read());
    }
    textFile.close();
  } else {
    Serial.println("error opening wokwi.txt!");
  }
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input
  
  //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(myInt);  //write int variable to SD card in line
    Serial.println(myFloat); //write float variable to SD card in line
    Serial.println(myString); //write String variable to SD card in line
    Serial.println(myCharArray); //write char array to SD card in line
    Serial.write(myByteArray, 5);
    Serial.write("\n");  //new line

    myFile.println("test");
    myFile.println(myInt);  //write int variable to SD card in line
    myFile.println(myFloat); //write float variable to SD card in line
    myFile.println(myString); //write String variable to SD card in line
    myFile.println(myCharArray); //write char array to SD card in line
    myFile.write(myByteArray, 5);
    myFile.write("\n"); //new line

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

      if (i < 4)
      myFile.write(","); //comma
    }
    myFile.write("\n"); //new line

  

for (int k = 1; k < 10; k++) {
  knob = analogRead(A0);
  myFile.println(knob);

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

  val = digitalRead(inputPin);  // read input value
  
  
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    delay(knob);
    delay(val);
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else { 
    digitalWrite(ledPin, LOW); // turn LED OFF
    delay(knob);
    delay(val);
    if (pirState == HIGH) {
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}
  myFile.close();
  Serial.println("data written");
} 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 opening file for reading!");
}
Serial.println("file reading complete");
}


void loop() {
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW); // turn LED OFF
    if (pirState == HIGH) {
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}

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();
  }
}