/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * <BR><BR>
 *
 * Author: Katherine Don, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * <BR><BR>
 *
 * 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 General Public License for more details.
 *
 * <BR><BR>
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.gui;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import org.greenstone.gatherer.Dictionary;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.checklist.CheckList;
import org.greenstone.gatherer.checklist.Entry;
import org.greenstone.gatherer.gui.GLIButton;
import org.greenstone.gatherer.gui.SimpleMenuBar;
import org.greenstone.gatherer.gui.ModalDialog;
import org.greenstone.gatherer.cdm.ElementWrapper;
import org.greenstone.gatherer.util.StaticStrings;
import org.greenstone.gatherer.util.Utility;
import org.w3c.dom.*;

/** this class is pretty much copied from an inner class of MEM - AddSetActionListener. At some stage the two should be merged so there is only one copy of the code. */
public class NewMetaSetPrompt
    extends ModalDialog {
    
    private boolean cancelled = true;
    private JTextField name_field = null;
    private JTextField namespace_field = null;
    private JDialog self;
    
    static private Dimension size = new Dimension(400,125);
    static final private Dimension LABEL_SIZE = new Dimension(100,30);
    static final private Dimension ADD_SET_SIZE = new Dimension(400,125);
   
    public NewMetaSetPrompt() {
	super(Gatherer.g_man, true);
	this.self = this;
	setModal(true);
	setSize(size);
	Dictionary.setText(this, "MEM.AddSet");
	
	// Creation
	JPanel content_pane = (JPanel) getContentPane();
	content_pane.setBackground(Gatherer.config.getColor("coloring.collection_heading_background", false));
	JPanel center_pane = new JPanel();
	center_pane.setOpaque(false);

	JPanel name_pane = new JPanel();
	name_pane.setOpaque(false);
	JLabel name_label = new JLabel();
	name_label.setOpaque(false);
	name_label.setPreferredSize(LABEL_SIZE);
	Dictionary.setText(name_label, "MEM.Name");
	name_field = new JTextField();
	name_field.setBackground(Gatherer.config.getColor("coloring.collection_tree_background", false));
	name_field.setForeground(Gatherer.config.getColor("coloring.collection_tree_foreground", false));
	name_field.setSelectionColor(Gatherer.config.getColor("coloring.collection_selection_background", false));
	name_field.setSelectedTextColor(Gatherer.config.getColor("coloring.collection_selection_foreground", false));
	Dictionary.setTooltip(name_field, "MEM.Set_Name_Tooltip");
	
	JPanel namespace_pane = new JPanel();
	namespace_pane.setOpaque(false);
	JLabel namespace_label = new JLabel();
	namespace_label.setOpaque(false);
	namespace_label.setPreferredSize(LABEL_SIZE);
	Dictionary.setText(namespace_label, "MEM.Namespace");
	namespace_field = new JTextField();
	namespace_field.setBackground(Gatherer.config.getColor("coloring.collection_tree_background", false));
	namespace_field.setForeground(Gatherer.config.getColor("coloring.collection_tree_foreground", false));
	namespace_field.setSelectionColor(Gatherer.config.getColor("coloring.collection_selection_background", false));
	namespace_field.setSelectedTextColor(Gatherer.config.getColor("coloring.collection_selection_foreground", false));
	Dictionary.setTooltip(namespace_field, "MEM.Set_Namespace_Tooltip");


	JPanel button_pane = new JPanel();
	button_pane.setOpaque(false);
	
	JButton ok_button = new GLIButton();
	ok_button.setMnemonic(KeyEvent.VK_O);
	Dictionary.setBoth(ok_button, "General.OK", "General.OK_Tooltip");
	ok_button.setEnabled(false);
	JButton cancel_button = new GLIButton();
	cancel_button.setMnemonic(KeyEvent.VK_C);
	Dictionary.setBoth(cancel_button, "General.Cancel", "General.Pure_Cancel_Tooltip");
	TextFieldEnabler ok_button_enabler = new TextFieldEnabler(ok_button);

	// Connection
	cancel_button.addActionListener(new OKButtonListener());
	ok_button.addActionListener(new CancelButtonListener());
	ok_button_enabler.add(name_field);
	ok_button_enabler.add(namespace_field);

	// Layout
	namespace_pane.setBorder(BorderFactory.createEmptyBorder(0,0,5,0));
	namespace_pane.setLayout(new BorderLayout());
	namespace_pane.add(namespace_label, BorderLayout.WEST);
	namespace_pane.add(namespace_field, BorderLayout.CENTER);
	
	name_pane.setBorder(BorderFactory.createEmptyBorder(0,0,5,0));
	name_pane.setLayout(new BorderLayout());
	name_pane.add(name_label, BorderLayout.WEST);
	name_pane.add(name_field, BorderLayout.CENTER);
	
	center_pane.setLayout(new GridLayout(2,1));
	center_pane.add(name_pane);
	center_pane.add(namespace_pane);
	
	button_pane.setLayout(new GridLayout(1,2,0,5));
	button_pane.add(ok_button);
	button_pane.add(cancel_button);
	
	content_pane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
	content_pane.setLayout(new BorderLayout());
	content_pane.add(center_pane, BorderLayout.CENTER);
	content_pane.add(button_pane, BorderLayout.SOUTH);
	
	setLocation((Gatherer.config.screen_size.width - ADD_SET_SIZE.width) / 2, (Gatherer.config.screen_size.height - ADD_SET_SIZE.height) / 2);
	setVisible(true);
    }

    public boolean isCancelled() {
	return cancelled;
    }
    
    public String getNamespace() {
	return namespace_field.getText();
    }

    public String getName() {
	return name_field.getText();
    }
    
    private class CancelButtonListener
	implements ActionListener {
	public void actionPerformed(ActionEvent event) {
	    cancelled = true;
	    self.dispose();
	}
    }
    public class OKButtonListener
	implements ActionListener {
	public void actionPerformed(ActionEvent event) {
	    cancelled = false;
	    self.dispose();
	}
    }
	
    /** Used to enable a certain target component if and only if all the registered text fields contain non-zero length strings. */
    private class TextFieldEnabler
	implements DocumentListener {
	private boolean ignore = false;
	private Component target = null;
	private JTextComponent[] fields = null;
	public TextFieldEnabler(Component target) {
	    super();
	    this.target = target;
	}
	public void add(JTextComponent field) {
	    // Record this field as being one we depend upon
	    if(fields == null) {
		fields = new JTextComponent[1];
		fields[0] = field;
	    }
	    else {
		JTextComponent[] temp = new JTextComponent[fields.length + 1];
		System.arraycopy(fields, 0, temp, 0, fields.length);
		temp[fields.length] = field;
		fields = temp;
		temp = null;
	    }
	    // Add the appropriate listener
	    field.getDocument().addDocumentListener(this);
	}
	/** Gives notification that an attribute or set of attributes changed. */
	public void changedUpdate(DocumentEvent e) {
	    canEnable();
	}
	/** Gives notification that there was an insert into the document. */
	public void insertUpdate(DocumentEvent e) {
	    canEnable();
	}
        /** Gives notification that a portion of the document has been removed. */
	public void removeUpdate(DocumentEvent e) {
	    canEnable();
	}
	private void canEnable() {
	    if(!ignore) {
		ignore = true;
		boolean can_enable = true;
		for(int i = 0; can_enable && i < fields.length; i++) {
		    can_enable = can_enable && (fields[i].getText().length() > 0);
		}
		target.setEnabled(can_enable);
		ignore = false;
	    }
	}
    }

}