/*
 * Copyright (c) 2005 Serge Baranov. All Rights Reserved.
 */
package amip.configurator.ui.util;

import amip.configurator.Main;

import javax.swing.*;
import javax.swing.text.DefaultEditorKit;
import javax.swing.text.JTextComponent;
import java.awt.event.*;

public class PopUpMenu {
  private static JPopupMenu pm = createPopUpMenu();
  private static MouseListener popupListener = new PopupListener();

  public static void addCopyPasteMenu(JTextComponent tc) {
    tc.addMouseListener(popupListener);
  }

  public static JPopupMenu getPm() {
    return pm;
  }

  private static JPopupMenu createPopUpMenu() {
    final JPopupMenu pm = new JPopupMenu();

    JMenuItem mi;

    mi = new JMenuItem(new DefaultEditorKit.CutAction());
    mi.setText(Main.res.getString("popup.cut"));
    pm.add(mi);

    mi = new JMenuItem(new DefaultEditorKit.CopyAction());
    mi.setText(Main.res.getString("popup.copy"));
    pm.add(mi);

    mi = new JMenuItem(new DefaultEditorKit.PasteAction());
    mi.setText(Main.res.getString("popup.paste"));
    pm.add(mi);

    mi = new JMenuItem(Main.res.getString("popup.delete"));
    mi.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        deleteSelection((JTextComponent) pm.getInvoker());
      }
    });
    pm.add(mi);

    pm.addSeparator();

    mi = new JMenuItem(Main.res.getString("popup.selectall"));
    mi.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        ((JTextComponent) pm.getInvoker()).selectAll();
      }
    });
    pm.add(mi);
    return pm;
  }

  private static String deleteSelection(JTextComponent tc) {
    int ss = tc.getSelectionStart();
    int se = tc.getSelectionEnd();

    String st = tc.getSelectedText();

    String text = tc.getText();
    int len = text.length();

    text = text.substring(0, ss) + text.substring(se, len);
    tc.setText(text);
    tc.setCaretPosition(ss);

    return st;
  }

  static class PopupListener extends MouseAdapter {
    public void mousePressed(MouseEvent e) {
      maybeShowPopup(e);
    }

    public void mouseReleased(MouseEvent e) {
      maybeShowPopup(e);
    }

    private void maybeShowPopup(MouseEvent e) {
      if (e.isPopupTrigger()) {
        JTextComponent tc = (JTextComponent) e.getComponent();
        if (tc.isEnabled()) {
          if (tc.getSelectedText() == null) {
            setEnabled(0, false);
            setEnabled(1, false);
            setEnabled(3, false);
          } else {
            setEnabled(0, true);
            setEnabled(1, true);
            setEnabled(3, true);
          }
          pm.show(e.getComponent(),
            e.getX(), e.getY());
        }
      }
    }

    private void setEnabled(int item, boolean enabled) {
      MenuElement[] subElements = pm.getSubElements();
      subElements[item].getComponent().setEnabled(enabled);
    }
  }
}