Untitled

import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

// User class
class User {
    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public boolean checkPassword(String password) {
        return this.password.equals(password);
    }
}

// Note class
class Note {
    private String content;
    private boolean isSecure;

    public Note(String content, boolean isSecure) {
        this.content = content;
        this.isSecure = isSecure;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public boolean isSecure() {
        return isSecure;
    }

    @Override
    public String toString() {
        return (isSecure ? "[Secured] " : "") + content;
    }
}

// GUI for Sign In Screen
class SignInScreen {
    private JFrame frame;

    public SignInScreen(ArrayList<User> users) {
        frame = new JFrame("Sign In");
        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.add(panel);
        placeComponents(panel, users);

        frame.setVisible(true);
    }

    private void placeComponents(JPanel panel, ArrayList<User> users) {
        panel.setLayout(null);

        JLabel userLabel = new JLabel("Username:");
        userLabel.setBounds(10, 20, 80, 25);
        panel.add(userLabel);

        JTextField userText = new JTextField(20);
        userText.setBounds(100, 20, 165, 25);
        panel.add(userText);

        JLabel passwordLabel = new JLabel("Password:");
        passwordLabel.setBounds(10, 50, 80, 25);
        panel.add(passwordLabel);

        JPasswordField passwordText = new JPasswordField(20);
        passwordText.setBounds(100, 50, 165, 25);
        panel.add(passwordText);

        JLabel confirmLabel = new JLabel("Confirm:");
        confirmLabel.setBounds(10, 80, 80, 25);
        panel.add(confirmLabel);

        JPasswordField confirmText = new JPasswordField(20);
        confirmText.setBounds(100, 80, 165, 25);
        panel.add(confirmText);

        JButton registerButton = new JButton("Sign In");
        registerButton.setBounds(10, 110, 150, 25);
        panel.add(registerButton);

        registerButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = userText.getText();
                String password = new String(passwordText.getPassword());
                String confirmPassword = new String(confirmText.getPassword());

                if (!password.equals(confirmPassword)) {
                    JOptionPane.showMessageDialog(frame, "Passwords do not match.", "Error", JOptionPane.ERROR_MESSAGE);
                    return;
                }

                if (!validatePassword(password)) {
                    JOptionPane.showMessageDialog(frame, "Password must be 6+ characters with uppercase, lowercase, and a special character.", "Error", JOptionPane.ERROR_MESSAGE);
                    return;
                }

                users.add(new User(username, password));
                JOptionPane.showMessageDialog(frame, "User created successfully!", "Success", JOptionPane.INFORMATION_MESSAGE);
                frame.dispose();
                new LoginScreen(users);
            }
        });
    }

    private boolean validatePassword(String password) {
        if (password.length() < 6) return false;
        boolean hasUppercase = false;
        boolean hasLowercase = false;
        boolean hasSpecial = false;

        for (char c : password.toCharArray()) {
            if (Character.isUpperCase(c)) hasUppercase = true;
            else if (Character.isLowerCase(c)) hasLowercase = true;
            else if (!Character.isLetterOrDigit(c)) hasSpecial = true;
        }

        return hasUppercase && hasLowercase && hasSpecial;
    }
}

// GUI for Login Screen
class LoginScreen {
    private JFrame frame;

    public LoginScreen(ArrayList<User> users) {
        frame = new JFrame("Log In");
        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.add(panel);
        placeComponents(panel, users);

        frame.setVisible(true);
    }

    private void placeComponents(JPanel panel, ArrayList<User> users) {
        panel.setLayout(null);

        JLabel userLabel = new JLabel("Username:");
        userLabel.setBounds(10, 20, 80, 25);
        panel.add(userLabel);

        JTextField userText = new JTextField(20);
        userText.setBounds(100, 20, 165, 25);
        panel.add(userText);

        JLabel passwordLabel = new JLabel("Password:");
        passwordLabel.setBounds(10, 50, 80, 25);
        panel.add(passwordLabel);

        JPasswordField passwordText = new JPasswordField(20);
        passwordText.setBounds(100, 50, 165, 25);
        panel.add(passwordText);

        JButton loginButton = new JButton("Log In");
        loginButton.setBounds(10, 80, 150, 25);
        panel.add(loginButton);

        loginButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = userText.getText();
                String password = new String(passwordText.getPassword());

                for (User user : users) {
                    if (user.getUsername().equals(username) && user.checkPassword(password)) {
                        JOptionPane.showMessageDialog(frame, "Login successful!", "Success", JOptionPane.INFORMATION_MESSAGE);
                        frame.dispose();
                        new UserScreen(username);
                        return;
                    }
                }

                JOptionPane.showMessageDialog(frame, "Invalid username or password.", "Error", JOptionPane.ERROR_MESSAGE);
            }
        });
    }
}

// GUI for User Screen
class UserScreen {
    private JFrame frame;

    public UserScreen(String username) {
        frame = new JFrame("Welcome, " + username);
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.add(panel);
        placeComponents(panel);

        frame.setVisible(true);
    }

    private void placeComponents(JPanel panel) {
        panel.setLayout(null);

        JLabel welcomeLabel = new JLabel("Welcome to your notes, " + "User!");
        welcomeLabel.setBounds(10, 20, 300, 25);
        panel.add(welcomeLabel);

        JButton manageNotesButton = new JButton("Manage Notes");
        manageNotesButton.setBounds(10, 60, 150, 25);
        panel.add(manageNotesButton);

        manageNotesButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // Placeholder for managing notes
                JOptionPane.showMessageDialog(frame, "Manage notes functionality here.", "Info", JOptionPane.INFORMATION_MESSAGE);
            }
        });

        JButton logoutButton = new JButton("Logout");
        logoutButton.setBounds(10, 100, 150, 25);
        panel.add(logoutButton);

        logoutButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                frame.dispose();
                new LoginScreen(NoteTakingApp.users);
            }
        });
    }
}

// Main application class
public class NoteTakingApp {
    public static ArrayList<User> users = new ArrayList<>();

    public static void main(String[] args) {
        new SignInScreen(users);
    }
}