/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 by RapidMiner and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapidminer.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.tools;

import java.awt.Color;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Collection;
import java.util.LinkedList;

import javax.swing.JTextField;
import javax.swing.text.Document;

import org.jdesktop.swingx.prompt.PromptSupport;
import org.jdesktop.swingx.prompt.PromptSupport.FocusBehavior;

import com.itextpdf.text.Font;
import com.rapidminer.tools.I18N;

/**
 * A text field for JList, JTable, or JTree filters. Updates all
 * registered {@link FilterListener} objects each time a key is pressed.
 * 
 * @author Tobias Malbrecht, Nils Woehler
 */
public class FilterTextField extends JTextField {

	private static final long serialVersionUID = -7613936832117084427L;

	private String defaultFilterText = I18N.getMessage(I18N.getGUIBundle(), "gui.filter_text_field.label");

	private final Collection<FilterListener> filterListeners;

	private final Collection<SelectionNavigationListener> selectionNavigationListeners;

	public FilterTextField() {
		this(null, null, 0);
	}

	public FilterTextField(int columns) {
		this(null, null, columns);
	}

	public FilterTextField(String text) {
		this(null, text, 0);
	}

	public FilterTextField(String text, int columns) {
		this(null, text, columns);
	}

	public FilterTextField(Document doc, String text, int columns) {
		super(doc, text, columns);
		filterListeners = new LinkedList<FilterListener>();
		selectionNavigationListeners = new LinkedList<SelectionNavigationListener>();
		if (text != null && text.length() != 0) {
			setDefaultFilterText(text);
		}
		PromptSupport.setForeground(Color.LIGHT_GRAY, this);
		PromptSupport.setPrompt(defaultFilterText, this);
		PromptSupport.setFontStyle(Font.ITALIC, this);
		PromptSupport.setFocusBehavior(FocusBehavior.SHOW_PROMPT, this);
		addKeyListener(new KeyListener() {

			@Override
			public void keyPressed(KeyEvent e) {
				if ((e == null)
						|| ((e.getKeyCode() != KeyEvent.VK_BACK_SPACE) && (e.getKeyCode() != KeyEvent.VK_ESCAPE) && (e.getKeyCode() != KeyEvent.VK_DELETE)
								&& (e.getKeyCode() != KeyEvent.VK_SHIFT) && (e.getKeyCode() != KeyEvent.VK_ALT) && (e.getKeyCode() != KeyEvent.VK_ALT_GRAPH)
								&& (e.getKeyCode() != KeyEvent.VK_CONTROL) && (e.getKeyCode() != KeyEvent.VK_META) && (!e.isActionKey()))) {
				}
				if (e == null) {
					return;
				}
				switch (e.getKeyCode()) {
					case KeyEvent.VK_UP:
						for (SelectionNavigationListener l : selectionNavigationListeners) {
							l.up();
						}
						e.consume();
						return;
					case KeyEvent.VK_DOWN:
						for (SelectionNavigationListener l : selectionNavigationListeners) {
							l.down();
						}
						e.consume();
						return;
					case KeyEvent.VK_ENTER:
						for (SelectionNavigationListener l : selectionNavigationListeners) {
							l.selected();
						}
						e.consume();
						return;
				}
			}

			@Override
			public void keyReleased(KeyEvent e) {
				updateFilter(e);
			}

			@Override
			public void keyTyped(KeyEvent e) {
			}
		});
		addFocusListener(new FocusListener() {

			@Override
			public void focusGained(FocusEvent e) {
				selectAll();
			}

			@Override
			public void focusLost(FocusEvent e) {
				updateFilter(null);
			}
		});
	}

	public void addFilterListener(FilterListener l) {
		filterListeners.add(l);
	}

	public void removeFilterListener(FilterListener l) {
		filterListeners.remove(l);
	}

	public void addSelectionNavigationListener(SelectionNavigationListener l) {
		selectionNavigationListeners.add(l);
	}

	public void removeSelectionNavigationListener(SelectionNavigationListener l) {
		selectionNavigationListeners.remove(l);
	}

	public void clearFilter() {
		setText(null);
		updateFilter(null);
	}

	private void updateFilter(KeyEvent e) {
		String filterText = getText();
		if ((filterText == null) || (filterText.length() == 0)) {
			if ((e == null)
					|| ((e.getKeyCode() != KeyEvent.VK_BACK_SPACE) && (e.getKeyCode() != KeyEvent.VK_DELETE) && (e.getKeyCode() != KeyEvent.VK_SHIFT)
							&& (e.getKeyCode() != KeyEvent.VK_ALT) && (e.getKeyCode() != KeyEvent.VK_ALT_GRAPH) && (e.getKeyCode() != KeyEvent.VK_CONTROL)
							&& (e.getKeyCode() != KeyEvent.VK_META) && (!e.isActionKey()))) {
				setText(null);
			}
		}
		for (FilterListener l : filterListeners) {
			l.valueChanged(filterText);
		}
	}

	public void setDefaultFilterText(String text) {
		this.defaultFilterText = text;
		PromptSupport.setPrompt(text, this);
	}

}