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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.net.*;
public class Nyzilla extends TinyWebBrowser {
    public static void main(String[] args) {
        URL.setURLStreamHandlerFactory(new WinnytpURLStreamHandlerFactory());
        new Nyzilla();
    }
    protected String getDefaultPage() {
        return "winnytp://";
    }
    protected String getWindowTitle() {
        return "Nyzilla 0.2";
    }
}
class TinyWebBrowser {
    public static void main(String[] args) {
        new TinyWebBrowser();
    }
    TinyWebBrowser() {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
    protected String getDefaultPage() {
        return "http://www.yahoo.co.jp/";
    }
    protected String getWindowTitle() {
        return "TinyWebBrowser 0.2";
    }
    protected Dimension getDefaultWindowSize() {
        return new Dimension(750, 800);
    }
    JPanel browserPanel;
    JTextField addressField = new JTextField();
    JButton backButton = new JButton("Back");
    JButton reloadButton = new JButton("Reload");
    JLabel statusArea = new JLabel(" ");
    Cursor waitCursor = new Cursor(Cursor.WAIT_CURSOR);
    Page currentPage = null;
    java.util.Stack pageStack = new java.util.Stack();
    static final Font font = new Font("SansSerif", Font.PLAIN, 14);
    private void createAndShowGUI() {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
        }
        JFrame f = new JFrame(getWindowTitle());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        browserPanel = new JPanel();
        browserPanel.setOpaque(true);
        browserPanel.setLayout(new BorderLayout());
        JPanel addressBar = new JPanel(new BorderLayout());
        JLabel l = new JLabel("Address (URL): ");
        l.setFont(font);
        addressBar.add(l, BorderLayout.LINE_START);
        addressField.setFont(font);
        setAddress(getDefaultPage());
        addressField.addActionListener(new AddressEnterAction());
        addressBar.add(addressField, BorderLayout.CENTER);
        JPanel buttonPanel = new JPanel(new FlowLayout());
        backButton.addActionListener(new BackButtonAction());
        backButton.setEnabled(false);
        buttonPanel.add(backButton);
        reloadButton.addActionListener(new ReloadButtonAction());
        buttonPanel.add(reloadButton);
        addressBar.add(buttonPanel, BorderLayout.LINE_END);
        browserPanel.add(addressBar, BorderLayout.PAGE_START);
        statusArea.setFont(font);
        browserPanel.add(statusArea, BorderLayout.PAGE_END);
        f.setContentPane(browserPanel);
        f.setSize(getDefaultWindowSize());
        f.setVisible(true);
    }
    class Page {
        JScrollPane pane;
        JEditorPane editor;
        Page() {
            editor = new JEditorPane();
            editor.setEditable(false);
            editor.setContentType("text/html");
            pane = new JScrollPane(editor);
            pane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
            editor.addHyperlinkListener(new HyperlinkAction());
        }
        void setPage(String url) throws IOException {
            if (url == null || url.length() == 0) return;
            try {
                browserPanel.setCursor(waitCursor);
                editor.setPage(url);
                setAddress(editor.getPage().toString());
            } catch (IOException e) {
                showAccessError(e);
                throw e;
            } finally {
                browserPanel.setCursor(Cursor.getDefaultCursor());
            }
        }
    }
    class HyperlinkAction implements HyperlinkListener {
        public void hyperlinkUpdate(HyperlinkEvent v) {
            HyperlinkEvent.EventType t = v.getEventType();
            if (t == HyperlinkEvent.EventType.ACTIVATED) {
                String url = v.getURL().toString();
                statusArea.setText(" ");
                replaceLocation(url);
            } else if (t == HyperlinkEvent.EventType.ENTERED) {
                String url = v.getURL().toString();
                statusArea.setText(url);
            } else if (t == HyperlinkEvent.EventType.EXITED) {
                statusArea.setText(" ");
            }
        }
    }
    class AddressEnterAction implements ActionListener {
        public void actionPerformed(ActionEvent v) {
            String url = addressField.getText();
            replaceLocation(url);
        }
    }
    private void replaceLocation(String url) {
        try {
            Page newPage = new Page();
            newPage.setPage(url);
            if (currentPage != null) {
                pageStack.push(currentPage);
                backButton.setEnabled(true);
                browserPanel.remove(currentPage.pane);
            }
            currentPage = newPage;
            browserPanel.add(newPage.pane, BorderLayout.CENTER);
            refresh();
            setAddress(newPage.editor.getPage().toString());
        } catch (IOException e) {
        }
    }
    class BackButtonAction implements ActionListener {
        public void actionPerformed(ActionEvent v) {
            if (pageStack.isEmpty()) return;
            backButton.setEnabled(false);
            Page prevPage = (Page)pageStack.pop(); 
            browserPanel.remove(currentPage.pane);
            currentPage = prevPage;
            browserPanel.add(currentPage.pane, BorderLayout.CENTER);
            refresh();
            if (!pageStack.isEmpty()) {
                backButton.setEnabled(true);
            }
        }
    }
    class ReloadButtonAction implements ActionListener {
        public void actionPerformed(ActionEvent v) {
            String url = currentPage.editor.getPage().toString();
            try {
                reloadButton.setEnabled(false);
                Page newPage = new Page();
                newPage.setPage(url);
                browserPanel.remove(currentPage.pane);
                currentPage = newPage;
                browserPanel.add(newPage.pane, BorderLayout.CENTER);
                refresh();
                setAddress(newPage.editor.getPage().toString());
            } catch (IOException e) {
            } finally {
                reloadButton.setEnabled(true);
            }
        }
    }
    private void refresh() {
        browserPanel.validate();
        browserPanel.repaint();
    }
    private void setAddress(String url) {
        addressField.setText(url);
        addressField.setCaretPosition(0);
    }
    private void showAccessError(Exception e) {
        JOptionPane.showMessageDialog(
            browserPanel, 
            e.toString(), 
            "Access Error", 
            JOptionPane.ERROR_MESSAGE
        );
    }
}

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