#include <Wire.h>
#include <RTClib.h>
#include <LiquidCrystal.h>
#include <SPI.h>
#include <MFRC522.h>

RTC_DS1307 rtc;
LiquidCrystal lcd(7, 8, 5, 4, 3, 2); // RS, E, D4, D5, D6, D7

#define SS_PIN 53  // Slave Select Pin for RFID-RC522 module
#define RST_PIN 12 // Reset Pin for RFID-RC522 module
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance

#define TRIG_PIN 10 // Ultrasonic sensor trigger pin
#define ECHO_PIN 11 // Ultrasonic sensor echo pin

bool cardScanned = false;
bool movementDetected = false;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  if (!rtc.begin()) {
    lcd.print("RTC not found!");
    Serial.println("RTC not found!");
    while (1);
  }

  lcd.begin(16, 2);
  Serial.println("LCD initialized");

  SPI.begin();
  mfrc522.PCD_Init();
  Serial.println("RFID-RC522 initialized");

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  displayDateTime();
  checkRFID(); // Check for RFID card

  if (detectMovement()) {
    movementDetected = true;
    unsigned long movementStart = millis(); // Record the time when movement is detected

    while (millis() - movementStart < 20000) { // Display "Welcome" message for 20 seconds
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Welcome,");
      Serial.println("Movement detected");
      if (cardScanned) {
        lcd.setCursor(0, 1);
        lcd.print("Teddy");
        Serial.println("Card scanned. Welcome Teddy.");
        delay(10000); // Display "Welcome Teddy" for 10 seconds
        cardScanned = false; // Reset cardScanned flag after displaying the message
      } else {
        lcd.setCursor(0, 1);
        lcd.print("please scan");
        Serial.println("Please scan RFID card");
      }
      delay(1000);
    }
    movementDetected = false; // Reset movementDetected flag after handling the event
  }
}

void displayDateTime() {
  DateTime now = rtc.now();
  lcd.clear();
  Serial.println("Displaying date and time");

  // Display the time
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  printTwoDigits(now.hour());
  lcd.print(":");
  printTwoDigits(now.minute());
  lcd.print(":");
  printTwoDigits(now.second());

  // Display the day of the week and date
  String daysOfWeek[7] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
  lcd.setCursor(0, 1);
  lcd.print(daysOfWeek[now.dayOfTheWeek()]);
  lcd.print(" - ");
  printTwoDigits(now.month());
  lcd.print("/");
  printTwoDigits(now.day());
  lcd.print("/");
  lcd.print(now.year());
}

void printTwoDigits(int number) {
  if (number < 10) {
    lcd.print("0");
  }
  lcd.print(number);
}

bool detectMovement() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  long distance = (duration * 0.034) / 2;

  if (distance < 100 && !movementDetected) { // Ensure the message is displayed only once per movement
    return true;
  } else {
    return false;
  }
}

void checkRFID() {
  // Look for new cards
  if (!mfrc522.PICC_IsNewCardPresent()) {
    return;
  }

  // Select one of the cards
  if (!mfrc522.PICC_ReadCardSerial()) {
    return;
  }

  // If we reach here, a card was successfully read
  Serial.println("Card UID:");
  for (byte i = 0; i < mfrc522.uid.size; i++) {
    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
  }
  Serial.println();
  Serial.println("Card Read Accepted"); // Print message on Serial monitor
  lcd.clear(); // Clear the LCD
  lcd.setCursor(0, 0);
  lcd.print("Card Read"); // Display message on LCD
  lcd.setCursor(0, 1);
  lcd.print("Accepted");
  delay(2000); // Pause to display the message, adjust as needed

  cardScanned = true; // Set cardScanned to true upon successful card read
}