Log.java

package game;

import game.Server.Pair;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.io.*;
import java.net.Socket;
import java.util.Arrays;
import java.util.Scanner;
import java.util.concurrent.ExecutionException;

/**
 * This is the login page where the user inputs its username
 * and its password to connect to the server.
 */
public class Log {
    // The private fields
    private JFrame frame = new JFrame("J Tank Trouble");
    private JTextField userName = new JTextField("User Name");
    private JPasswordField passwordField = new JPasswordField();
    private JCheckBox remember = new JCheckBox("Remember me");
    private JCheckBox showPassword = new JCheckBox("Show Password");
    private JLabel userLabel = new JLabel(new ImageIcon("src/game/IconsInGame/Farshid/name_48px.png"));
    private JLabel passwordLabel = new JLabel(new ImageIcon("src/game/IconsInGame/Farshid/key_100px.png"));
    private JButton logIn = new JButton("Log in"), signUp = new JButton("Sign Up");
    private JLabel logo = new JLabel(new ImageIcon("src/game/IconsInGame/Farshid/Logo.png"));
 
    /**
     * This method will build the login frame and will
     * display it to the user.
     */
    public void run() {
        AudioMaker.startTheTheme();
        frame.setIconImage(new ImageIcon("src/game/IconsInGame/Icon.png").getImage());
        frame.setPreferredSize(new Dimension(750, 500));
        frame.setLocation(390, 130);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setResizable(false);
        init();
        // Creating the login page
        Runnable r = () -> {
            JPanel c = null;
            try {
                c = new MainPanel(ImageIO.read(new File("src/game/IconsInGame/Farshid/background.png")));
            } catch (IOException e) {
                e.printStackTrace();
            }
            assert c != null;
            c.setLayout(null);
            setLocations();
            addStuff(c);
            frame.add(c);
            frame.pack();
            frame.setVisible(true);
        };
        SwingUtilities.invokeLater(r);
//        logIn.doClick(); //for remember.
    }

    /**
     * this method will add the stuff that we made to the panel c
     * @param c the panel that we wanna add our stuff
     */
    private void addStuff(JPanel c) {
        c.add(logo);
        c.add(userLabel);
        c.add(userName);
        c.add(passwordLabel);
        c.add(passwordField);
        c.add(remember);
        c.add(showPassword);
        c.add(logIn);
        c.add(signUp);
    }

    /**
     * the name tells everything about it.
     */
    private void setLocations() {
        logo.setLocation(125, 0);
        userLabel.setLocation(250, 125);
        userName.setLocation(330, 155);
        passwordLabel.setLocation(250, 175);
        passwordField.setLocation(330, 205);
        remember.setLocation(275, 260);
        showPassword.setLocation(275, 300);
        logIn.setLocation(275, 350);
        signUp.setLocation(365, 350);
    }

    /**
     * This method will set the styles to
     * the components.
     */
    private void init() {
        logo.setSize(500, 150);
        logIn.setSize(80, 30);
        signUp.setSize(80, 30);
        userLabel.setSize(90, 90);
        userName.setSize(140, 25);
        passwordLabel.setSize(90, 90);
        passwordField.setSize(140, 25);
        remember.setSize(160, 20);//105
        showPassword.setSize(160, 20);//113
        showPassword.setFont(new Font("Dialog", Font.BOLD, 15));
        remember.setFont(new Font("Dialog", Font.BOLD, 15));
        passwordField.setEchoChar('*');
        remember.setContentAreaFilled(false);
        showPassword.setContentAreaFilled(false);
        remember.setForeground(Color.BLACK);
        showPassword.setForeground(Color.BLACK);
        userName.setBorder(null);
        passwordField.setBorder(null);
        passwordField.setText("Password");
        logIn.setBackground(Color.BLACK);
        logIn.setForeground(Color.white);
        signUp.setBackground(Color.BLACK);
        signUp.setForeground(Color.white);
        UIManager.put("Button.select", Color.DARK_GRAY);
        showPassword.addActionListener(e -> {
            if (showPassword.isSelected())
                passwordField.setEchoChar((char) 0);
            else
                passwordField.setEchoChar('*');
        });
        userName.addFocusListener(new FocusAdapter() {
            /**
             * Invoked when a component gains the keyboard focus.
             *
             * @param e even that happened.
             */
            @Override
            public void focusGained(FocusEvent e) {
                if (userName.getText().equals("User Name"))
                    userName.setText("");
            }

            @Override
            public void focusLost(FocusEvent e) {
                if (userName.getText().equals(""))
                    userName.setText("User Name");
            }
        });
        passwordField.addFocusListener(new FocusAdapter() {
            /**
             * Invoked when a component gains the keyboard focus.
             *
             * @param e  even that happened.(Focus Event)
             */
            @Override
            public void focusGained(FocusEvent e) {
                if (Arrays.equals(passwordField.getPassword(), "Password".toCharArray()))
                    passwordField.setText("");
            }

            @Override
            public void focusLost(FocusEvent e) {
                if (passwordField.getPassword().length == 0)
                    passwordField.setText("Password");
            }
        });
        initButtons();
    }

    private void initButtons() {
        logIn.addActionListener(e -> new SwingWorker<>() {
            Setting setting = new Setting();

            /**
             * Computes a result, or throws an exception if unable to do so.
             *
             * <p>
             * Note that this method is executed only once.
             *
             * <p>
             * Note: this method is executed in a background thread.
             *
             * @return the computed result
             */
            @Override
            protected Object doInBackground() {
                String ip = "127.0.0.1";//you can change it later.
                int port = 1726;//you can change the port later too.
                String ret = null;
                try {
                    Socket socket = new Socket(ip, port);
                    ret = takeString(socket, "Log in");
                    if (ret.equalsIgnoreCase("user entered the game."))
                        setting.setConnectionSocket(socket);
                } catch (Exception ex) {
                    System.err.println(ex.getMessage());
                }
                return ret;
            }

            @Override
            protected void done() {
                try {
                    String ret = get().toString();
                    if (ret.equalsIgnoreCase("user entered the game.")) {
                        // Done with the login
                        frame.dispose();
                        // Enter into the game setting
                        TankChooser tankChooser = new TankChooser(userName.getText(), setting);
                        tankChooser.run();
                        return;
                    }
                    if (!userName.getText().equalsIgnoreCase("User Name"))
                        JOptionPane.showMessageDialog(null, get().toString());
                } catch (InterruptedException | ExecutionException | NullPointerException ex) {
                    JOptionPane.showMessageDialog(null, "Your attempt to connect to our servers was failed.", "Error", JOptionPane.ERROR_MESSAGE);
                }
            }
        }.execute());

        signUp.addActionListener(e -> new SwingWorker<>() {
            /**
             * Computes a result, or throws an exception if unable to do so.
             *
             * <p>
             * Note that this method is executed only once.
             *
             * <p>
             * Note: this method is executed in a background thread.
             *
             * @return the computed result
             */
            @Override
            protected Object doInBackground() {
                String ip = "127.0.0.1";//you can change it later .
                int port = 1726;//you can change the port later too.
                String ret = null;
                try (Socket socket = new Socket(ip, port)) {
                    ret = takeString(socket, "Sign up");
                } catch (Exception ex) {
                    System.out.println(ex.getMessage());
                }
                return ret;
            }

            @Override
            protected void done() {
                try {
                    JOptionPane.showMessageDialog(null, get().toString());
                } catch (InterruptedException | ExecutionException | NullPointerException ex) {
                    JOptionPane.showMessageDialog(null, "Your attempt to connect to our servers was failed.", "Error", JOptionPane.PLAIN_MESSAGE);
                }
            }
        }.execute());
    }

    private String takeString(Socket socket, String s) throws IOException {
        Scanner in = new Scanner(socket.getInputStream());
        PrintStream out = new PrintStream(socket.getOutputStream());
        String name = userName.getText();
        String pass = String.valueOf(passwordField.getPassword());
        var pair = readUserPass();
        if (!pair.getFirst().equals("*") && !pair.getSecond().equals("*")) {
            name = pair.getFirst();
            pass = pair.getSecond();
        }
        out.println(s);
        out.println(name);
        out.println(pass);
        String response = in.nextLine();
        modifyRemember(name, pass, response);
        return response;
    }

    private void modifyRemember(String name, String pass, String response) throws FileNotFoundException {
        if (remember.isSelected() && response.equalsIgnoreCase("user entered the game.")) {
            PrintWriter writer = new PrintWriter("src/game/UserInfo/userToRemember.txt");
            writer.println(name);
            writer.println(pass);
        }
    }

    private Pair<String, String> readUserPass() {
        Scanner scanner = new Scanner("src/game/UserInfo/userToRemember.txt");
        String s1 = "*", s2 = "*";
        if (scanner.hasNextLine()) {
            s1 = scanner.nextLine();
        }
        if (scanner.hasNextLine())
            s2 = scanner.nextLine();
        return new Pair<>(s1, s2);
    }

    private static class MainPanel extends JPanel {
        private Image bg;

        MainPanel(Image bg) {
            this.bg = bg;
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(bg, 0, 0, getWidth(), getHeight(), this);
        }
    }
}