AddEmployee.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;

public class AddEmployee extends JPanel {
    private JTextField employeeNameField, fatherNameField, addressField, mobileField, cnicField;
    private JComboBox<String> roomComboBox;

    public AddEmployee() {
        setLayout(null);
        setBackground(new Color(230, 240, 255));
        setBounds(350, 80, 700, 500);

        JLabel titleLabel = new JLabel("Add Employee");
        titleLabel.setFont(new Font("SansSerif", Font.BOLD, 24));
        titleLabel.setBounds(20, 10, 200, 30);
        add(titleLabel);

        JLabel employeeNameLabel = new JLabel("Employee Name:");
        employeeNameLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        employeeNameLabel.setBounds(20, 50, 120, 25);
        add(employeeNameLabel);

        employeeNameField = new JTextField();
        employeeNameField.setBounds(140, 50, 200, 25);
        add(employeeNameField);

        JLabel fatherNameLabel = new JLabel("Father Name:");
        fatherNameLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        fatherNameLabel.setBounds(20, 90, 120, 25);
        add(fatherNameLabel);

        fatherNameField = new JTextField();
        fatherNameField.setBounds(140, 90, 200, 25);
        add(fatherNameField);

        JLabel addressLabel = new JLabel("Address:");
        addressLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        addressLabel.setBounds(20, 130, 120, 25);
        add(addressLabel);

        addressField = new JTextField();
        addressField.setBounds(140, 130, 200, 25);
        add(addressField);

        JLabel mobileLabel = new JLabel("Mobile No:");
        mobileLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        mobileLabel.setBounds(20, 170, 120, 25);
        add(mobileLabel);

        mobileField = new JTextField();
        mobileField.setBounds(140, 170, 200, 25);
        add(mobileField);

        JLabel cnicLabel = new JLabel("CNIC:");
        cnicLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        cnicLabel.setBounds(20, 210, 120, 25);
        add(cnicLabel);

        cnicField = new JTextField();
        cnicField.setBounds(140, 210, 200, 25);
        add(cnicField);

        JLabel roomLabel = new JLabel("Select Room:");
        roomLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        roomLabel.setBounds(20, 270, 120, 25);
        add(roomLabel);

        roomComboBox = new JComboBox<>();
        roomComboBox.setBounds(140, 270, 200, 25);
        add(roomComboBox);
        loadAvailableRooms(roomComboBox);

        JButton saveButton = new JButton("Save");
        saveButton.setBounds(140, 320, 100, 30);
        add(saveButton);

        saveButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String name = employeeNameField.getText().trim();
                String fatherName = fatherNameField.getText().trim();
                String address = addressField.getText().trim();
                String mobile = mobileField.getText().trim();
                String cnic = cnicField.getText().trim();
                String roomNo = (String) roomComboBox.getSelectedItem();

                if (name.isEmpty() || fatherName.isEmpty() || address.isEmpty() || 
                    !mobile.matches("\\d{11}") || !cnic.matches("\\d{5}-\\d{7}-\\d") || 
                    roomNo == null) {
                    JOptionPane.showMessageDialog(AddEmployee.this, "Please fill all fields correctly.");
                    return;
                }

                try {
                    List<String> lines = Files.readAllLines(Paths.get("rooms.txt"));
                    boolean roomFound = false;
                    for (int i = 0; i < lines.size(); i++) {
                        String line = lines.get(i);
                        String[] parts = line.split(",");
                        if (parts[0].equals(roomNo)) {
                            if (parts[2].equals("Not Booked")) {
                                parts[2] = "Booked";
                                lines.set(i, String.join(",", parts));
                                roomFound = true;
                            } else {
                                JOptionPane.showMessageDialog(AddEmployee.this, "Room is already booked.");
                                return;
                            }
                            break;
                        }
                    }

                    if (!roomFound) {
                        JOptionPane.showMessageDialog(AddEmployee.this, "Room not found.");
                        return;
                    }

                    Files.write(Paths.get("rooms.txt"), lines);

                    try (BufferedWriter writer = new BufferedWriter(new FileWriter("employees.txt", true))) {
                        writer.write(name + "," + fatherName + "," + address + "," + mobile + "," + cnic + "," + roomNo);
                        writer.newLine();
                    }

                    JOptionPane.showMessageDialog(AddEmployee.this, "Employee added successfully.");
                    employeeNameField.setText("");
                    fatherNameField.setText("");
                    addressField.setText("");
                    mobileField.setText("");
                    cnicField.setText("");
                    loadAvailableRooms(roomComboBox);
                } catch (IOException ex) {
                    ex.printStackTrace();
                    JOptionPane.showMessageDialog(AddEmployee.this, "Error saving data.");
                }
            }
        });
    }

    private void loadAvailableRooms(JComboBox<String> comboBox) {
        comboBox.removeAllItems();
        try (BufferedReader reader = new BufferedReader(new FileReader("rooms.txt"))) {
            String line;
            while ((line = reader.readLine()) != null) {
                String[] parts = line.split(",");
                if (parts.length == 3 && parts[1].equals("Yes") && parts[2].equals("Not Booked")) {
                    comboBox.addItem(parts[0]);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        comboBox.setMaximumRowCount(15);
    }

    public void reloadAvailableRooms() {
        loadAvailableRooms(roomComboBox);
    }
}