#include <SPI.h>
#include <SD.h>
#include <DS3232RTC.h>

File myFile;
DS3232RTC rtc;

int button = A0;
int LED = A1;
int CS = 10;
int currentButtonState;
int lastButtonState;

void setup() {
  pinMode(button, INPUT);
  pinMode(LED, OUTPUT);
  pinMode(CS, OUTPUT);

  Serial.begin(9600);
  rtc.begin();
  setSyncProvider(rtc.get);

  while (!Serial) {
    ;
  }

  if (SD.begin()) {
    Serial.println("SD card is ready to use.");
    myFile = SD.open("test.csv", FILE_WRITE);
    delay(100);
    myFile.close();
  }

  else {
    Serial.println("SD card initialisation failed.");
    return;
  }
}

void loop() {
  lastButtonState = currentButtonState;
  currentButtonState = digitalRead(button);

  if (lastButtonState == LOW && currentButtonState == HIGH) {
    SerialClockDisplay();
    digitalWrite(LED, HIGH);

    myFile = SD.open("test.csv", FILE_WRITE);
    if (myFile) {
      myFileClockDisplay();
      myFile.close();
    }

    else {
      Serial.println("error opening test.csv");
    }
    
    delay(2000);
    digitalWrite(LED, LOW);
  }
}

void myFileClockDisplay() {
  myFile.print(hour());
  myFilePrintDigits(minute());
  myFilePrintDigits(second());
  myFile.print(',');
  myFile.print(day());
  myFile.print('/');
  myFile.print(month());
  myFile.print('/');
  myFile.print(year());
  myFile.println();
  myFile.println();
}

void myFilePrintDigits(int digits) {
  myFile.print(':');
  if (digits < 10) {
    myFile.print('0');
  }
  myFile.print(digits);
}

void SerialClockDisplay() {
  Serial.print(hour());
  SerialPrintDigits(minute());
  SerialPrintDigits(second());
  Serial.println(' ');
  Serial.print(day());
  Serial.print('/');
  Serial.print(month());
  Serial.print('/');
  Serial.print(year());
  Serial.println();
  Serial.println();
}

void SerialPrintDigits(int digits) {
  Serial.print(':');
  if (digits < 10) {
    Serial.print('0');
  }
  Serial.print(digits);
}