/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2008 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.look.fc;

import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

/**
 * The list containing the bookmarks.
 *
 * @author Ingo Mierswa
 * @version $Id: BookmarkList.java,v 1.4 2008/05/09 19:22:53 ingomierswa Exp $
 */
public class BookmarkList extends JList implements ListSelectionListener, MouseListener {

	private static final long serialVersionUID = -7109320787696008679L;

	private static class BookmarkCellRenderer implements ListCellRenderer {
		
		private JLabel label = new JLabel();
		
		public BookmarkCellRenderer() {
			this.label.setBorder(BorderFactory.createEmptyBorder(1,2,1,2));
			this.label.setOpaque(true);
		}
		
		public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
			Bookmark bookmark = (Bookmark)value;
			
			String name = bookmark.getName();
			final String path = bookmark.getPath();
			
			if (isSelected) {
				label.setBackground(UIManager.getColor("List.selectionBackground"));
				label.setForeground(UIManager.getColor("List.selectionForeground"));
			} else {
				label.setBackground(UIManager.getColor("List.background"));
				label.setForeground(UIManager.getColor("List.foreground"));
			}
			
			if (!new File(path).exists()) {
				label.setForeground(Color.GRAY);
			}
			
			label.setText(name);
			label.setToolTipText("<html><b>" + name + "</b><br>" + path + "</html>");
			return label;
		}
	}
	
	private static final ListCellRenderer RENDERER = new BookmarkCellRenderer();
	
	private FileList fileList;
	
	public BookmarkList(BookmarkListModel model, FileList fileList) {
		super(model);
		this.fileList = fileList;
		addListSelectionListener(this);
		addMouseListener(this);
	}
	
	public ListCellRenderer getCellRenderer() {
		return RENDERER;
	}

	public void valueChanged(ListSelectionEvent e) {
		if (e.getValueIsAdjusting() == false) {
			Bookmark selectedBookmark = (Bookmark)getSelectedValue();
			if (selectedBookmark != null) {
				String path = selectedBookmark.getPath();
				File bookmarkFile = new File(path);
				if (bookmarkFile.exists() && bookmarkFile.canRead()) {
					fileList.filechooserUI.setCurrentDirectoryOfFileChooser(bookmarkFile);
				} else {
					JOptionPane.showConfirmDialog(fileList.fc, "Cannot access selected bookmark directory.", "Cannot access directory", JOptionPane.PLAIN_MESSAGE, JOptionPane.ERROR_MESSAGE);
				}
			}
		}
	}
	
	public void mouseClicked(MouseEvent e) {}

	public void mouseEntered(MouseEvent e) {}

	public void mouseExited(MouseEvent e) {}

	public void mousePressed(MouseEvent e) {
		int index = locationToIndex(e.getPoint());
		setSelectedIndex(index);
		evaluatePopup(e);
	}

	public void mouseReleased(MouseEvent e) {
		evaluatePopup(e);
	}
	
	/** Checks if the given mouse event is a popup trigger and creates a new popup menu if necessary. */
	private void evaluatePopup(MouseEvent e) {
		if (e.isPopupTrigger()) {
			JPopupMenu menu = createBookmarkPopupMenu();
			if (menu != null)  {
				menu.show(this, e.getX(), e.getY());
			}
		}
	}
	
	private JPopupMenu createBookmarkPopupMenu() {
		final Bookmark bookmark = (Bookmark)getSelectedValue();
		if (bookmark != null) {
			JPopupMenu bookmarksPopup = new JPopupMenu();

			JMenuItem menuItem = new JMenuItem("Rename Bookmark");
			menuItem.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					fileList.renameBookmark(bookmark);
				}
			});
			bookmarksPopup.add(menuItem);

			menuItem = new JMenuItem("Delete Bookmark");
			menuItem.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					fileList.deleteBookmark(bookmark);
				}
			});
			bookmarksPopup.add(menuItem);

			return bookmarksPopup;
		} else {
			return null;
		}
	}
}