UpdateDeleteStudent.java

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.nio.file.*;
import java.util.List;
import javax.swing.*;

public class UpdateDeleteStudent extends JPanel {
    private JTextField mobileField, nameField, fatherNameField, cnicField, roomNoField;
    private JComboBox<String> livingStatusCombo;
    private JButton updateButton, deleteButton;
    private List<String> studentLines;
    private int studentIndex;
    private String originalRoomNo;

    public UpdateDeleteStudent() {

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

        JLabel titleLabel = new JLabel("Update & Delete Student");
        titleLabel.setFont(new Font("SansSerif", Font.BOLD, 24));
        titleLabel.setBounds(20, 20, 300, 30);
        add(titleLabel);

        JLabel mobileLabel = new JLabel("Mobile Number:");
        mobileLabel.setFont(new Font("SansSerif", Font.PLAIN, 16));
        mobileLabel.setBounds(20, 70, 120, 25);
        add(mobileLabel);

        mobileField = new JTextField();
        mobileField.setBounds(140, 70, 200, 25);
        add(mobileField);

        JButton searchButton = new JButton("Search");
        searchButton.setBounds(350, 70, 100, 25);
        add(searchButton);


 JLabel nameLabel = new JLabel("Name:");
        nameLabel.setBounds(20, 120, 120, 25);
        add(nameLabel);

        nameField = new JTextField();
        nameField.setBounds(140, 120, 200, 25);
        nameField.setEnabled(false);
        add(nameField);

        JLabel fatherNameLabel = new JLabel("Father's Name:");
        fatherNameLabel.setBounds(20, 160, 120, 25);
        add(fatherNameLabel);

        fatherNameField = new JTextField();
        fatherNameField.setBounds(140, 160, 200, 25);
        fatherNameField.setEnabled(false);
        add(fatherNameField);

        JLabel cnicLabel = new JLabel("CNIC:");
        cnicLabel.setBounds(20, 200, 120, 25);
        add(cnicLabel);

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

        JLabel roomNoLabel = new JLabel("Room Number:");
        roomNoLabel.setBounds(20, 240, 120, 25);
        add(roomNoLabel);

        roomNoField = new JTextField();
        roomNoField.setBounds(140, 240, 200, 25);
        roomNoField.setEnabled(false);
        add(roomNoField);

        JLabel livingStatusLabel = new JLabel("Living Status:");
        livingStatusLabel.setBounds(20, 280, 120, 25);
        add(livingStatusLabel);

        String[] statusOptions = {"Living", "Non-Living"};
        livingStatusCombo = new JComboBox<>(statusOptions);
        livingStatusCombo.setBounds(140, 280, 200, 25);
        livingStatusCombo.setEnabled(false);
        add(livingStatusCombo);

        updateButton = new JButton("Update");
        updateButton.setBounds(140, 320, 100, 30);
        updateButton.setEnabled(false);
        add(updateButton);



        searchButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String mobile = mobileField.getText().trim();
                if (mobile.isEmpty()) {
                    JOptionPane.showMessageDialog(null, "Please enter a mobile number.");
                    return;
                }
                try {
                    studentLines = Files.readAllLines(Paths.get("students.txt"));
                    for (int i = 0; i < studentLines.size(); i++) {
                        String line = studentLines.get(i);
                        String[] parts = line.split(",");
                        if (parts.length >= 6 && parts[3].equals(mobile)) { 
                            nameField.setText(parts[0]);
                            fatherNameField.setText(parts[1]);
                            cnicField.setText(parts[4]);
                            roomNoField.setText(parts[5]);
                            roomNoField.setEditable(false);
                            livingStatusCombo.setSelectedItem("Living"); 
                            originalRoomNo = parts[5]; 
                            studentIndex = i;
                            nameField.setEnabled(true);
                            fatherNameField.setEnabled(true);
                            cnicField.setEnabled(true);
                            roomNoField.setEnabled(true);
                            livingStatusCombo.setEnabled(true);
                            updateButton.setEnabled(true);
                            deleteButton.setEnabled(true);
                            return;
                        }
                    }
                    JOptionPane.showMessageDialog(null, "Student not found.");
                } catch (IOException ex) {
                    ex.printStackTrace();
                    JOptionPane.showMessageDialog(null, "Error reading students file.");
                }
            }
        });

       

        updateButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String name = nameField.getText().trim();
                String fatherName = fatherNameField.getText().trim();
                String cnic = cnicField.getText().trim();
                String mobile = mobileField.getText().trim();
                String roomNo = roomNoField.getText().trim();
                String livingStatus = (String) livingStatusCombo.getSelectedItem();

                if (name.isEmpty() || fatherName.isEmpty() || cnic.isEmpty() || mobile.length() != 11 || cnic.length() != 15) {
                    JOptionPane.showMessageDialog(null, "Please fill all fields correctly.");
                    return;
                }

                try {
                    String originalLine = studentLines.get(studentIndex);
                    String[] originalParts = originalLine.split(",");
                    String address = originalParts[2];
                    if (livingStatus.equals("Non-Living")) {
                        try (BufferedWriter writer = new BufferedWriter(new FileWriter("leaved_students.txt", true))) {
                            writer.write(originalLine);
                            writer.newLine();
                        }
                        studentLines.remove(studentIndex);
                        List<String> roomLines = Files.readAllLines(Paths.get("rooms.txt"));
                        for (int i = 0; i < roomLines.size(); i++) {
                            String line = roomLines.get(i);
                            String[] parts = line.split(",");
                            if (parts[0].equals(originalRoomNo)) {
                                parts[2] = "Not Booked";
                                roomLines.set(i, String.join(",", parts));
                                break;
                            }
                        }
                        Files.write(Paths.get("rooms.txt"), roomLines);
                        Files.write(Paths.get("students.txt"), studentLines);
                        JOptionPane.showMessageDialog(null, "Student marked as Non-Living and moved to leaved students.");
                    } else {
                        String updatedLine = name + "," + fatherName + "," + address + "," + mobile + "," + cnic + "," + roomNo;
                        studentLines.set(studentIndex, updatedLine);
                        Files.write(Paths.get("students.txt"), studentLines);
                        JOptionPane.showMessageDialog(null, "Student details updated.");
                    }
                } catch (IOException ex) {
                    ex.printStackTrace();
                    JOptionPane.showMessageDialog(null, "Error updating student data: " + ex.getMessage());
                } finally {
                    clearFields();
                }
            }
        });

        deleteButton = new JButton("Delete");
        deleteButton.setBounds(250, 320, 100, 30);
        deleteButton.setEnabled(false);
        add(deleteButton);

        deleteButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int confirm = JOptionPane.showConfirmDialog(null, "Are you sure you want to delete this student?", "Confirm Delete", JOptionPane.YES_NO_OPTION);
                if (confirm == JOptionPane.YES_OPTION) {
                    try {
                        String originalLine = studentLines.get(studentIndex);
                        studentLines.remove(studentIndex);
                        Files.write(Paths.get("students.txt"), studentLines);
                        List<String> roomLines = Files.readAllLines(Paths.get("rooms.txt"));
                        for (int i = 0; i < roomLines.size(); i++) {
                            String line = roomLines.get(i);
                            String[] parts = line.split(",");
                            if (parts[0].equals(originalRoomNo)) {
                                parts[2] = "Not Booked";
                                roomLines.set(i, String.join(",", parts));
                                break;
                            }
                        }
                        Files.write(Paths.get("rooms.txt"), roomLines);
                        JOptionPane.showMessageDialog(null, "Student deleted.");
                    } catch (IOException ex) {
                        ex.printStackTrace();
                        JOptionPane.showMessageDialog(null, "Error deleting student data: " + ex.getMessage());
                    } finally {
                        clearFields();
                    }
                }
            }
        });
    }

    private void clearFields() {
        nameField.setText("");
        fatherNameField.setText("");
        cnicField.setText("");
        roomNoField.setText("");
        livingStatusCombo.setSelectedIndex(0);
        nameField.setEnabled(false);
        fatherNameField.setEnabled(false);
        cnicField.setEnabled(false);
        roomNoField.setEnabled(false);
        livingStatusCombo.setEnabled(false);
        updateButton.setEnabled(false);
        deleteButton.setEnabled(false);
        mobileField.setText("");
        mobileField.setEnabled(true);  
        mobileField.requestFocus();
    }
}