NexusApp.java

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Point2D;
import java.io.*;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * NexusApp - Улучшенный мессенджер на Java Swing.
 * Добавлено: Валидация пароля, профили, список пользователей, смена темы и градиентный фон.
 */
public class NexusApp extends JFrame {

    private static final String GITHUB_RAW_URL = "https://raw.githubusercontent.com/userscode/nexusapp/refs/heads/main/NexusApp.java";
    private static final String CURRENT_FILE_NAME = "NexusApp.java";

    private CardLayout cardLayout;
    private JPanel mainPanel;
    private LoadingOverlay loadingOverlay;

    // Цветовые палитры
    public static Color BG_DARKER = new Color(30, 31, 34);
    public static Color BG_DARK = new Color(43, 45, 49);
    public static Color BG_MEDIUM = new Color(49, 51, 56);
    public static Color BG_LIGHT = new Color(56, 58, 64);
    public static Color ACCENT = new Color(88, 101, 242);
    public static Color TEXT_MAIN = new Color(219, 222, 225);
    public static Color TEXT_MUTED = new Color(148, 155, 164);

    private boolean isDarkTheme = true;

    // Данные текущего пользователя
    private String currentUsername = "User123";
    private String currentStatus = "Пишу код...";
    private Color userAvatarColor = ACCENT;

    public NexusApp() {
        setTitle("Nexus | Современный мессенджер");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(1100, 700);
        setMinimumSize(new Dimension(900, 600));
        setLocationRelativeTo(null);

        cardLayout = new CardLayout();
        mainPanel = new JPanel(cardLayout);

        loadingOverlay = new LoadingOverlay();
        mainPanel.add(loadingOverlay, "LOADING");
        mainPanel.add(createAuthPanel(), "AUTH");
        mainPanel.add(createMessengerPanel(), "MESSENGER");

        add(mainPanel);
        cardLayout.show(mainPanel, "LOADING");

        new Thread(this::checkForUpdates).start();
    }

    private void checkForUpdates() {
        try {
            Thread.sleep(2000); 
            // В реальных условиях здесь будет логика чтения GitHub
            showAuth();
        } catch (Exception e) {
            showAuth();
        }
    }

    private void showAuth() {
        SwingUtilities.invokeLater(() -> {
            loadingOverlay.stopAnimation();
            cardLayout.show(mainPanel, "AUTH");
        });
    }

    // --- ПАНЕЛЬ АВТОРИЗАЦИИ С ГРАДИЕНТОМ ---
    private JPanel createAuthPanel() {
        JPanel authPanel = new JPanel(new GridBagLayout()) {
            @Override
            protected void paintComponent(Graphics g) {
                Graphics2D g2d = (Graphics2D) g;
                int w = getWidth();
                int h = getHeight();
                GradientPaint gp = new GradientPaint(0, 0, new Color(40, 42, 54), w, h, ACCENT);
                g2d.setPaint(gp);
                g2d.fillRect(0, 0, w, h);
            }
        };

        JPanel card = new RoundedPanel(24, BG_MEDIUM);
        card.setLayout(new BoxLayout(card, BoxLayout.Y_AXIS));
        card.setBorder(new EmptyBorder(40, 40, 40, 40));
        card.setPreferredSize(new Dimension(450, 550));

        JLabel title = new JLabel("Создать аккаунт");
        title.setFont(new Font("SansSerif", Font.BOLD, 28));
        title.setForeground(Color.WHITE);
        title.setAlignmentX(Component.CENTER_ALIGNMENT);

        JTextField emailF = createInput("ЭЛЕКТРОННАЯ ПОЧТА", false);
        JTextField userF = createInput("ИМЯ ПОЛЬЗОВАТЕЛЯ", false);
        JPasswordField passF = (JPasswordField) createInput("ПАРОЛЬ (Мин. 6 символов)", true);

        JButton registerBtn = new JButton("Продолжить");
        styleButton(registerBtn);
        
        registerBtn.addActionListener(e -> {
            String pass = new String(passF.getPassword());
            String user = userF.getText().trim();
            if (user.isEmpty()) {
                JOptionPane.showMessageDialog(this, "Введите имя пользователя!");
                return;
            }
            if (pass.length() < 6) {
                JOptionPane.showMessageDialog(this, "Пароль слишком короткий! Минимум 6 символов.");
                return;
            }
            currentUsername = user;
            cardLayout.show(mainPanel, "MESSENGER");
        });

        card.add(title);
        card.add(Box.createVerticalStrut(30));
        card.add(emailF.getParent());
        card.add(Box.createVerticalStrut(20));
        card.add(userF.getParent());
        card.add(Box.createVerticalStrut(20));
        card.add(passF.getParent());
        card.add(Box.createVerticalStrut(35));
        card.add(registerBtn);

        authPanel.add(card);
        return authPanel;
    }

    // --- ГЛАВНЫЙ ИНТЕРФЕЙС МЕССЕНДЖЕРА ---
    private JPanel createMessengerPanel() {
        JPanel messenger = new JPanel(new BorderLayout());

        // Левая панель серверов
        JPanel serverBar = new JPanel();
        serverBar.setBackground(BG_DARKER);
        serverBar.setPreferredSize(new Dimension(72, 0));
        serverBar.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 15));
        serverBar.add(createSquircleIcon("DM", ACCENT));
        serverBar.add(createSquircleIcon("N", BG_LIGHT));

        // Сайдбар каналов
        JPanel sidebar = new JPanel(new BorderLayout());
        sidebar.setBackground(BG_DARK);
        sidebar.setPreferredSize(new Dimension(240, 0));
        
        JLabel header = new JLabel("Nexus Community");
        header.setBorder(new EmptyBorder(20, 15, 20, 15));
        header.setForeground(Color.WHITE);
        header.setFont(new Font("SansSerif", Font.BOLD, 16));
        sidebar.add(header, BorderLayout.NORTH);

        // Кнопка смены темы
        JButton themeBtn = new JButton("Сменить тему");
        themeBtn.setFocusPainted(false);
        themeBtn.setBackground(BG_LIGHT);
        themeBtn.setForeground(Color.WHITE);
        themeBtn.addActionListener(e -> toggleTheme());
        sidebar.add(themeBtn, BorderLayout.CENTER);

        // Панель профиля внизу
        JPanel profilePanel = new JPanel(new BorderLayout(10, 0));
        profilePanel.setBackground(new Color(35, 36, 40));
        profilePanel.setBorder(new EmptyBorder(10, 10, 10, 10));
        profilePanel.setCursor(new Cursor(Cursor.HAND_CURSOR));
        profilePanel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) { showProfileSettings(); }
        });

        JLabel avatarLabel = new JLabel() {
            @Override
            protected void paintComponent(Graphics g) {
                Graphics2D g2 = (Graphics2D) g;
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2.setColor(userAvatarColor);
                g2.fillOval(0, 0, 32, 32);
            }
        };
        avatarLabel.setPreferredSize(new Dimension(32, 32));
        
        JPanel textInfo = new JPanel(new GridLayout(2, 1));
        textInfo.setOpaque(false);
        JLabel uName = new JLabel(currentUsername);
        uName.setForeground(Color.WHITE);
        JLabel uStatus = new JLabel(currentStatus);
        uStatus.setFont(new Font("SansSerif", Font.PLAIN, 10));
        uStatus.setForeground(TEXT_MUTED);
        textInfo.add(uName);
        textInfo.add(uStatus);

        profilePanel.add(avatarLabel, BorderLayout.WEST);
        profilePanel.add(textInfo, BorderLayout.CENTER);
        sidebar.add(profilePanel, BorderLayout.SOUTH);

        // Чат
        JPanel chatArea = new JPanel(new BorderLayout());
        chatArea.setBackground(BG_MEDIUM);

        JPanel msgCont = new JPanel();
        msgCont.setLayout(new BoxLayout(msgCont, BoxLayout.Y_AXIS));
        msgCont.setBackground(BG_MEDIUM);
        JScrollPane scroll = new JScrollPane(msgCont);
        scroll.setBorder(null);

        JPanel inputWrap = new JPanel(new BorderLayout());
        inputWrap.setBackground(BG_MEDIUM);
        inputWrap.setBorder(new EmptyBorder(10, 20, 20, 20));

        JTextField input = new JTextField();
        input.setBackground(BG_LIGHT);
        input.setForeground(Color.WHITE);
        input.setCaretColor(Color.WHITE);
        input.setBorder(BorderFactory.createCompoundBorder(new RoundedBorder(12, BG_LIGHT), new EmptyBorder(12, 15, 12, 15)));
        input.addActionListener(e -> {
            if(!input.getText().isEmpty()){
                addMessage(msgCont, currentUsername, input.getText());
                input.setText("");
                msgCont.revalidate();
            }
        });
        inputWrap.add(input, BorderLayout.CENTER);

        chatArea.add(scroll, BorderLayout.CENTER);
        chatArea.add(inputWrap, BorderLayout.SOUTH);

        // Список пользователей (справа)
        JPanel memberList = new JPanel();
        memberList.setBackground(BG_DARK);
        memberList.setPreferredSize(new Dimension(200, 0));
        memberList.setLayout(new BoxLayout(memberList, BoxLayout.Y_AXIS));
        memberList.setBorder(new EmptyBorder(20, 10, 10, 10));
        
        JLabel mTitle = new JLabel("УЧАСТНИКИ — 3");
        mTitle.setForeground(TEXT_MUTED);
        mTitle.setFont(new Font("SansSerif", Font.BOLD, 11));
        memberList.add(mTitle);
        memberList.add(Box.createVerticalStrut(15));
        memberList.add(createMemberItem("Admin", Color.RED, "В сети"));
        memberList.add(createMemberItem("Alice", Color.PINK, "Спит"));
        memberList.add(createMemberItem(currentUsername, userAvatarColor, "Вы"));

        messenger.add(serverBar, BorderLayout.WEST);
        JPanel rightSide = new JPanel(new BorderLayout());
        rightSide.add(sidebar, BorderLayout.WEST);
        rightSide.add(chatArea, BorderLayout.CENTER);
        rightSide.add(memberList, BorderLayout.EAST);
        messenger.add(rightSide, BorderLayout.CENTER);

        return messenger;
    }

    private void showProfileSettings() {
        String newStatus = JOptionPane.showInputDialog(this, "Введите новое описание профиля:", currentStatus);
        if (newStatus != null) {
            currentStatus = newStatus;
            cardLayout.show(mainPanel, "MESSENGER"); // Обновляем
        }
    }

    private void toggleTheme() {
        isDarkTheme = !isDarkTheme;
        if (isDarkTheme) {
            BG_MEDIUM = new Color(49, 51, 56);
            BG_DARK = new Color(43, 45, 49);
            TEXT_MAIN = Color.WHITE;
        } else {
            BG_MEDIUM = new Color(242, 243, 245);
            BG_DARK = new Color(227, 229, 232);
            TEXT_MAIN = Color.BLACK;
        }
        JOptionPane.showMessageDialog(this, "Тема будет применена после перезагрузки UI (в разработке)");
    }

    private JPanel createMemberItem(String name, Color col, String sub) {
        JPanel p = new JPanel(new BorderLayout(10, 0));
        p.setBackground(BG_DARK);
        p.setMaximumSize(new Dimension(180, 45));
        
        JLabel av = new JLabel() {
            @Override protected void paintComponent(Graphics g) {
                Graphics2D g2 = (Graphics2D) g;
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2.setColor(col);
                g2.fillOval(0, 0, 24, 24);
            }
        };
        av.setPreferredSize(new Dimension(24, 24));
        
        JPanel info = new JPanel(new GridLayout(2, 1));
        info.setOpaque(false);
        JLabel n = new JLabel(name); n.setForeground(TEXT_MAIN);
        JLabel s = new JLabel(sub); s.setForeground(TEXT_MUTED); s.setFont(new Font("SansSerif", Font.PLAIN, 9));
        info.add(n); info.add(s);
        
        p.add(av, BorderLayout.WEST);
        p.add(info, BorderLayout.CENTER);
        return p;
    }

    private JTextField createInput(String labelStr, boolean isPass) {
        JPanel panel = new JPanel(new BorderLayout(0, 5));
        panel.setBackground(BG_MEDIUM);
        panel.setMaximumSize(new Dimension(360, 65));

        JLabel label = new JLabel(labelStr);
        label.setForeground(TEXT_MUTED);
        label.setFont(new Font("SansSerif", Font.BOLD, 11));

        JTextField field = isPass ? new JPasswordField() : new JTextField();
        field.setBackground(BG_DARKER);
        field.setForeground(Color.WHITE);
        field.setCaretColor(Color.WHITE);
        field.setBorder(BorderFactory.createCompoundBorder(new RoundedBorder(10, BG_DARKER), new EmptyBorder(10, 12, 10, 12)));

        panel.add(label, BorderLayout.NORTH);
        panel.add(field, BorderLayout.CENTER);
        return field;
    }

    private void addMessage(JPanel panel, String user, String text) {
        JPanel msg = new JPanel(new BorderLayout(10, 0));
        msg.setBackground(BG_MEDIUM);
        msg.setBorder(new EmptyBorder(10, 20, 10, 20));
        msg.setMaximumSize(new Dimension(Integer.MAX_VALUE, 80));

        JLabel info = new JLabel(user + " — Сегодня в 14:55");
        info.setForeground(TEXT_MUTED);
        info.setFont(new Font("SansSerif", Font.BOLD, 12));
        JLabel body = new JLabel("<html><body style='width: 400px'>" + text + "</body></html>");
        body.setForeground(TEXT_MAIN);

        msg.add(info, BorderLayout.NORTH);
        msg.add(body, BorderLayout.CENTER);
        panel.add(msg);
        panel.revalidate();
    }

    private void styleButton(JButton btn) {
        btn.setBackground(ACCENT);
        btn.setForeground(Color.WHITE);
        btn.setFocusPainted(false);
        btn.setFont(new Font("SansSerif", Font.BOLD, 15));
        btn.setBorder(new EmptyBorder(14, 0, 14, 0));
        btn.setCursor(new Cursor(Cursor.HAND_CURSOR));
        btn.setAlignmentX(Component.CENTER_ALIGNMENT);
        btn.setMaximumSize(new Dimension(360, 50));
    }

    private JPanel createSquircleIcon(String text, Color bg) {
        JPanel p = new JPanel() {
            @Override protected void paintComponent(Graphics g) {
                Graphics2D g2 = (Graphics2D) g;
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2.setColor(bg);
                g2.fillRoundRect(0, 0, 48, 48, 16, 16);
                g2.setColor(Color.WHITE);
                g2.setFont(new Font("SansSerif", Font.BOLD, 16));
                FontMetrics fm = g2.getFontMetrics();
                g2.drawString(text, (48-fm.stringWidth(text))/2, (48-fm.getHeight())/2 + fm.getAscent());
            }
        };
        p.setPreferredSize(new Dimension(48, 48));
        p.setBackground(BG_DARKER);
        return p;
    }

    // --- КЛАССЫ ОБЕРТКИ ---

    class LoadingOverlay extends JPanel {
        private double angleX = 0, angleY = 0;
        private Timer timer;
        LoadingOverlay() {
            setBackground(BG_DARKER);
            timer = new Timer(16, e -> { angleX += 0.03; angleY += 0.04; repaint(); });
            timer.start();
        }
        void stopAnimation() { timer.stop(); }
        @Override protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            int size = 80, cx = getWidth()/2, cy = getHeight()/2;
            g2.setColor(ACCENT);
            g2.setStroke(new BasicStroke(3));
            g2.drawRect(cx-size/2, cy-size/2, size, size); // Упрощенный куб для примера
            g2.setColor(Color.WHITE);
            String t = "Проверка безопасности...";
            g2.drawString(t, cx - g2.getFontMetrics().stringWidth(t)/2, cy + 100);
        }
    }

    class RoundedPanel extends JPanel {
        private int r; Color c;
        RoundedPanel(int r, Color c) { this.r = r; this.c = c; setOpaque(false); }
        @Override protected void paintComponent(Graphics g) {
            Graphics2D g2 = (Graphics2D) g;
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setColor(c);
            g2.fillRoundRect(0, 0, getWidth(), getHeight(), r, r);
        }
    }

    class RoundedBorder extends javax.swing.border.AbstractBorder {
        private int r; Color c;
        RoundedBorder(int r, Color c) { this.r = r; this.c = c; }
        @Override public void paintBorder(Component c, Graphics g, int x, int y, int w, int h) {
            Graphics2D g2 = (Graphics2D) g;
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setColor(this.c);
            g2.drawRoundRect(x, y, w-1, h-1, r, r);
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new NexusApp().setVisible(true));
    }
}