#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <RTClib.h>

// LCD setup
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Address 0x27, 16 columns, 2 rows

// Keypad setup
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// RTC setup
RTC_DS3231 rtc;

struct Room {
  String name;
  String doctor;
  String password;
};

Room rooms[5] = {
  {"A301", "Ahmed Ayoub", "1234"},
  {"A302", "Essam", "5678"},
  {"A303", "Ayman", "9101"},
  {"B301", "Basma", "1121"},
  {"B302", "Ahmed Selim", "3141"}
};

void setup() {
  Serial.begin(9600);
  
  // Initialize the LCD
  lcd.begin(16, 2);  // 16 columns and 2 rows
  lcd.backlight();   // Turn on the backlight for the LCD

  keypad.addEventListener(keypadEvent);

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);  // Halt if RTC is not found
  }

  Serial.println("System Ready.");
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    handleKey(key);
  }
}

void handleKey(char key) {
  static String input = "";
  if (key == '#') {
    checkPassword(input);
    input = ""; // Clear the input for the next entry
  } else {
    input += key; // Add the key pressed to the input string
  }
}

void checkPassword(String input) {
  bool found = false;
  for (int i = 0; i < 5; i++) {
    if (input == rooms[i].password) {
      found = true;
      displayRoomInfo(rooms[i]);
      break;
    }
  }
  if (!found) {
    lcd.clear();
    lcd.print("Invalid Password");
    delay(2000);  // Show message for 2 seconds
    lcd.clear();
  }
}

void displayRoomInfo(Room room) {
  lcd.clear();
  lcd.print("Room: " + room.name);
  lcd.setCursor(0, 1);
  lcd.print("Doctor: " + room.doctor);
  unsigned long startTime = millis();
  while (millis() - startTime < 3000) {  // Display for 3 seconds non-blocking
    // You can add code to handle keypad input here if needed.
  }
  lcd.clear();
}

void keypadEvent(KeypadEvent eKey) {
  switch (keypad.getState()) {
    case PRESSED:
      Serial.print("Pressed: ");
      Serial.println(eKey);
      break;
    case RELEASED:
      Serial.print("Released: ");
      Serial.println(eKey);
      break;
  }
}