#include <SPI.h>
#include <Wire.h>
#include <MAX7219.h>
#include <DS1302.h>
#include <MFRC522.h>
#include <Spreadsheet.h>

// Define pins for MAX7219 matrix display
const int dataPin = 11;
const int clockPin = 13;

// Define pins for RTC DS1302 module
const int sdaPin = 10;
const int sclPin = 9;

// Define pins for RC522 RFID reader
const int ssPin = 8;
const int rstPin = 7;

// Define pin for buzzer
const int buzzerPin = 4;

// Create instances of MAX7219 matrix display, RTC DS1302 module, and RC522 RFID reader
MAX7219 matrixDisplay(dataPin, clockPin, 1);
DS1302 rtc(sdaPin, sclPin);
MFRC522 mfrc522(ssPin, rstPin);

// Create an instance of Spreadsheet library
Spreadsheet spreadsheet("192.168.1.100", 5000);

// Set alarm time
const byte alarmHour = 12;
const byte alarmMinute = 30;
const byte alarmSecond = 0;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize MAX7219 matrix display
  matrixDisplay.begin();

  // Initialize RTC DS1302 module
  rtc.begin();

  // Set the current time
  rtc.setDateTime(2023, 11, 15, 16, 58, 0);

  // Set the alarm time
  rtc.setAlarm1(alarmHour, alarmMinute, alarmSecond);

  // Initialize RC522 RFID reader
  mfrc522.PCD_Init();
}

void loop() {
  // Check if the alarm is triggered and an RFID tag is present
  if (rtc.checkAlarm1() && mfrc522.PICC_IsPresent()) {
    // Stop the alarm
    rtc.clearAlarm1();

    // Turn on the buzzer
    tone(buzzerPin, 1000);

    // Delay for 1 second
    delay(1000);

    // Turn off the buzzer
    noTone(buzzerPin);

    // Get the card ID
    MFRC522::MIFARE_Classic card = mfrc522.PICC_Read();

    // Convert the card ID to a string
    String cardId = "";
    for (int i = 0; i < 4; i++) {
      cardId += String(card.uid.byte[i]);
    }

    // Update the spreadsheet with the card ID and mark the attendance as "present"
    spreadsheet.update(cardId, "present");

    // Provide audible feedback
    tone(buzzerPin, 500);

    // Delay for 0.5 seconds
    delay(500);

    // Turn off the buzzer
    noTone(buzzerPin);

    // Display the card ID on the matrix display
    matrixDisplay.print(cardId);

    // Delay for 2 seconds before clearing the display
    delay(2000);

    // Clear the display
    matrixDisplay.clear();
  }

  // Wait for the tag to be removed
  while (mfrc522.PICC_IsPresent()) {
    // Wait for the tag to be removed
    delay(100);
  }
}