/**
 *#########################################################################
 *
 * 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: John Thompson, 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.File;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.table.*;
import org.greenstone.gatherer.Configuration;
import org.greenstone.gatherer.Dictionary;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.file.FileAssociationManager;
import org.greenstone.gatherer.util.TableUtils;
import org.greenstone.gatherer.util.Utility;

/** The file association allows the entry of new file associations and the modification of existing ones.
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.3
 */
public class FileAssociationDialog
    extends ModalDialog {

    /** The default size for the dialog. */
    static final private Dimension SIZE = new Dimension(600, 450);

    private boolean ignore = false;
    private FileAssociationDialog self;
    private FileAssociationManager file_association_manager;
    private JButton add_button;
    private JButton browse_button;
    private JButton close_button;
    private JButton remove_button;
    private JButton replace_button;
    private JTable existing_associations_table;
    private JTextField command_field;
    private JTextField extension_field;

    /** Create a new file association dialog.
     * @param file_association_manager A reference to the <strong>FileAssociationManager</strong> so we can determine what extensions are already associated.
     */
    public FileAssociationDialog(FileAssociationManager file_association_manager) {
	super(Gatherer.g_man);
	this.file_association_manager = file_association_manager;
	this.self = this;
		  
	// Creation
	setModal(true);
	setSize(SIZE);
	setTitle(Dictionary.get("FileAssociationDialog.Title"));
	setJMenuBar(new SimpleMenuBar("fileassociations"));

	JPanel content_pane = (JPanel) getContentPane();
	content_pane.setBackground(Configuration.getColor("coloring.collection_heading_background", false));

	JTextArea instructions_area = new JTextArea(Dictionary.get("FileAssociationDialog.Instructions"));
	instructions_area.setEditable(false);
	instructions_area.setLineWrap(true);
	instructions_area.setRows(5);
	instructions_area.setWrapStyleWord(true);
	
	JPanel control_pane = new JPanel();
	existing_associations_table = new JTable(file_association_manager);
	existing_associations_table.setAutoResizeMode(JTable.AUTO_RESIZE_NEXT_COLUMN);
	existing_associations_table.setColumnSelectionAllowed(false);
	existing_associations_table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
	JPanel lower_pane = new JPanel();
	JPanel details_pane = new JPanel();

	JPanel extension_pane = new JPanel();
	JLabel extension_label = new JLabel(Dictionary.get("FileAssociationDialog.Extension"));
	extension_field = new NonWhitespaceField();
	extension_field.setToolTipText(Dictionary.get("FileAssociationDialog.Extension_Tooltip"));

	JLabel command_label = new JLabel(Dictionary.get("FileAssociationDialog.Command"));
	JPanel command_pane = new JPanel();
	command_field = new JTextField();
	command_field.setToolTipText(Dictionary.get("FileAssociationDialog.Command_Tooltip"));
	browse_button = new GLIButton(Dictionary.get("FileAssociationDialog.Browse"));
	browse_button.setEnabled(!Utility.isMac());
	if (Utility.isMac()) {
	    browse_button.setToolTipText(Dictionary.get("FileAssociationDialog.Browse_Tooltip_Mac"));
	} else {
	    browse_button.setToolTipText(Dictionary.get("FileAssociationDialog.Browse_Tooltip"));
	}


	JPanel button_pane = new JPanel();
	
	add_button = new GLIButton(Dictionary.get("FileAssociationDialog.Add"), Dictionary.get("FileAssociationDialog.Add_Tooltip"));
	add_button.setEnabled(false);
	
	replace_button = new GLIButton(Dictionary.get("FileAssociationDialog.Replace"), Dictionary.get("FileAssociationDialog.Replace_Tooltip"));
	replace_button.setEnabled(false);
	
	remove_button = new GLIButton(Dictionary.get("FileAssociationDialog.Remove"), Dictionary.get("FileAssociationDialog.Remove_Tooltip"));
	remove_button.setEnabled(false);
	
	close_button = new GLIButton(Dictionary.get("FileAssociationDialog.Close"), Dictionary.get("FileAssociationDialog.Close_Tooltip"));
	
	// Connection
	add_button.addActionListener(new AddButtonListener());
	browse_button.addActionListener(new BrowseButtonListener());
	close_button.addActionListener(new CloseButtonListener());
	remove_button.addActionListener(new RemoveButtonListener());
	replace_button.addActionListener(new ReplaceButtonListener());
	CommandOrExtensionFieldListener coefl = new CommandOrExtensionFieldListener();
	command_field.getDocument().addDocumentListener(coefl);
	extension_field.getDocument().addDocumentListener(coefl);
	coefl = null;
	existing_associations_table.getSelectionModel().addListSelectionListener(new ExistingAssociationsTableListener());

	// Layout
	extension_pane.setBorder(BorderFactory.createEmptyBorder(2,0,2,0));
	extension_pane.setLayout(new BorderLayout(5,0));
	extension_pane.add(extension_label, BorderLayout.WEST);
	extension_pane.add(extension_field, BorderLayout.CENTER);

	command_pane.setBorder(BorderFactory.createEmptyBorder(2,0,2,0));
	command_pane.setLayout(new BorderLayout());
	command_pane.add(command_field, BorderLayout.CENTER);
	command_pane.add(browse_button, BorderLayout.EAST);

	details_pane.setBorder(BorderFactory.createTitledBorder(Dictionary.get("FileAssociationDialog.Details")));
	details_pane.setLayout(new GridLayout(3,1));
	details_pane.add(extension_pane);
	details_pane.add(command_label);
	details_pane.add(command_pane);

	lower_pane.setBorder(BorderFactory.createEmptyBorder(2,0,0,0));
	button_pane.setLayout(new GridLayout(2,3));
	button_pane.add(add_button);
	button_pane.add(replace_button);
	button_pane.add(remove_button);
	button_pane.add(new JPanel());
	button_pane.add(new JPanel());
	button_pane.add(close_button);

	lower_pane.setBorder(BorderFactory.createEmptyBorder(2,0,0,0));
	lower_pane.setLayout(new BorderLayout());
	lower_pane.add(details_pane, BorderLayout.CENTER);
	lower_pane.add(button_pane, BorderLayout.SOUTH);

	control_pane.setBorder(BorderFactory.createEmptyBorder(5,0,0,0));
	control_pane.setLayout(new BorderLayout());
	control_pane.add(new JScrollPane(existing_associations_table), BorderLayout.CENTER);
	control_pane.add(lower_pane, BorderLayout.SOUTH);

	content_pane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
	content_pane.setLayout(new BorderLayout());
	content_pane.add(new JScrollPane(instructions_area), BorderLayout.NORTH);
	content_pane.add(control_pane, BorderLayout.CENTER);

	Rectangle screen = Gatherer.g_man.getBounds(null);
	setLocation((int)(screen.getX() + (screen.getWidth() - SIZE.width) / 2), (int)(screen.getY() + (screen.getHeight() - SIZE.height) / 2));
	screen = null;
    }

    public void destroy() {
	// Disconnect
	// Clean up
	file_association_manager = null;
	self = null;
    }

    /** Redisplay the dialog, ensuring that the details (or lack thereof) for a certain extension is apparent. In fact if an extension is provided force the user to add it or cancel.
     * @param new_extension The extension code as a <strong>String</strong>.
     */
    public String display(String new_extension) {
	// Clear the current selection
	existing_associations_table.clearSelection();
	if(new_extension != null) {
	    extension_field.setText(new_extension);
	}
	setVisible(true);
	if(new_extension != null) {
	    return file_association_manager.getCommandString(new_extension);
	}
	return null;
    }

    protected void processWindowEvent(WindowEvent event) {
	if(event.getID() == WindowEvent.WINDOW_ACTIVATED) {
	    TableUtils.fixColumnToPreferredWidth(existing_associations_table, 0); 
	}
	else {
	    super.processWindowEvent(event);
	}
    }

    private class AddButtonListener
	implements ActionListener {
	
	public void actionPerformed(ActionEvent event) {
	    String extension_str = extension_field.getText();
	    file_association_manager.setCommand(extension_str, command_field.getText());
	    // Select the appropriate entry in the table
	    int index = -1;
	    for(int i = 0; index == -1 && i < file_association_manager.size(); i++) {
		if(file_association_manager.getExtension(i).equals(extension_str)) {
		    index = i;
		}
	    }
	    if(index > -1) {
		existing_associations_table.setRowSelectionInterval(index, index);
	    }
	    // And update buttons
	    add_button.setEnabled(false);
	    remove_button.setEnabled(true);
	}
    }

    /** Batch filter shows only files ending in bat. Based on ImageFilter.java which is a 1.4 example used by FileChooserDemo2.java. */
    private class BatchFileFilter
	extends FileFilter {

	/** Accept all .exe files
	 * @param file a File
	 * @return true is this file should be shown, false otherwise
	 */
	public boolean accept(File file) {
	    return file.getName().toLowerCase().endsWith(".bat");
	}

	/** The description of this filter
	 * @return a String
	 */
	public String getDescription() {
	    return Dictionary.get("FileAssociationDialog.Batch_File");
	}
    }

    /** Whenever the user clicks the browse button, we should open up a file browser to allow them to select an executable file from somewhere in the file system. */
    private class BrowseButtonListener 
	implements ActionListener {
	/** Open up a simple JFileChooser when the user clicks the button. 
	 * @param event An <strong>ActionEvent</strong> containing information about the event.
	 */
	public void actionPerformed(ActionEvent event) {
	    JFileChooser chooser = new JFileChooser(new File(Gatherer.getGLIUserDirectoryPath()));
	    GUIUtils.disableRename(chooser);
	    chooser.setDialogTitle(Dictionary.get("FileAssociationDialog.Browse_Title"));
	    chooser.setFileFilter(new BatchFileFilter());
	    chooser.setFileFilter(new CoreObjectModelFileFilter());
	    chooser.setFileFilter(new ExecutableFileFilter());
	    chooser.setAcceptAllFileFilterUsed(true);
	    if(chooser.showOpenDialog(Gatherer.g_man) == JFileChooser.APPROVE_OPTION) {
		command_field.setText(chooser.getSelectedFile().getAbsolutePath());
	    }
	}
    }

    private class CloseButtonListener
	implements ActionListener {
	public void actionPerformed(ActionEvent event) {
	    existing_associations_table.clearSelection();
	    add_button.setEnabled(false);
	    remove_button.setEnabled(false);
	    replace_button.setEnabled(false);
	    self.dispose();
	}
    }

    /** Command filter shows only files ending in com. Based on ImageFilter.java which is a 1.4 example used by FileChooserDemo2.java. */
    private class CoreObjectModelFileFilter
	extends FileFilter {

	/** Accept all .exe files
	 * @param file a File
	 * @return true is this file should be shown, false otherwise
	 */
	public boolean accept(File file) {
	    return file.getName().toLowerCase().endsWith(".com");
	}

	/** The description of this filter
	 * @return a String
	 */
	public String getDescription() {
	    return Dictionary.get("FileAssociationDialog.Command_File");
	}
    }

    private class CommandOrExtensionFieldListener
	implements DocumentListener {
	/** Gives notification that an attribute or set of attributes changed. */
	public void changedUpdate(DocumentEvent e) {
	    changed();
	}
	/** Gives notification that there was an insert into the document. */
	public void insertUpdate(DocumentEvent e) {
	    changed();
	}
	/** Gives notification that a portion of the document has been removed. */
	public void removeUpdate(DocumentEvent e) {
	    changed();
	} 

	private void changed() {
	    ignore = true;
	    String extension_str = extension_field.getText();
	    String command_str = command_field.getText();
	    // Determine if there is currently an association selected
	    int selected_index = -1;
	    if((selected_index = existing_associations_table.getSelectionModel().getMinSelectionIndex()) != -1) {
		String current_extension_str = file_association_manager.getExtension(selected_index);
		String current_command_str = file_association_manager.getCommandString(current_extension_str);
		// What buttons are enabled depends a lot on the file extension, taken to be the 'key'
		if(extension_str.equals(current_extension_str)) {
		    // If the extensions are the same then remove is enabled
		    remove_button.setEnabled(true);
		    // But if the command is different, then enable replace
		    if(current_command_str.length() == 0) {
			add_button.setEnabled(true);
			replace_button.setEnabled(false);
		    }
		    else if(!command_str.equals(current_command_str)) {
			add_button.setEnabled(false);
			replace_button.setEnabled(true);
		    }
		    else {
			add_button.setEnabled(false);
			replace_button.setEnabled(false);
		    }
		}
		// We can add it, but we first clear the selection
		else {
		    existing_associations_table.clearSelection();
		    add_button.setEnabled(true);
		    remove_button.setEnabled(false);
		    replace_button.setEnabled(false);
		}
	    }
	    // If not, we must first test if the extension is in use
	    else {
		int index = -1;
		for(int i = 0; index == -1 && i < file_association_manager.size(); i++) {
		    String existing_extension_str = file_association_manager.getExtension(i);
		    if(existing_extension_str.equals(extension_str)) {
			index = i;
		    }
		}
		if(index != -1) {
		    // Selection that index
		    existing_associations_table.setRowSelectionInterval(index, index);
		    // Set replace and remove enabled
		    add_button.setEnabled(false);
		    remove_button.setEnabled(true);
		    replace_button.setEnabled(true);
		}
		// Otherwise if there is some text in both extension and command, enable add only
		else if(extension_str.length() > 0 && command_str.length() > 0) {
		    add_button.setEnabled(true);
		    remove_button.setEnabled(false);
		    replace_button.setEnabled(false);
		}
		// Otherwise disable everything
		else {
		    add_button.setEnabled(false);
		    remove_button.setEnabled(false);
		    replace_button.setEnabled(false);
		}
	    }
	    ignore = false;
	}
    }

    /** Executable filter shows only files ending in exe. Based on ImageFilter.java which is a 1.4 example used by FileChooserDemo2.java. */
    private class ExecutableFileFilter
	extends FileFilter {

	/** Accept all .exe files
	 * @param file a File
	 * @return true is this file should be shown, false otherwise
	 */
	public boolean accept(File file) {
	    return file.getName().toLowerCase().endsWith(".exe");
	}

	/** The description of this filter
	 * @return a String
	 */
	public String getDescription() {
	    return Dictionary.get("FileAssociationDialog.Executable_File");
	}
    }

    private class ExistingAssociationsTableListener
	implements ListSelectionListener {

	public void valueChanged(ListSelectionEvent event) {
	    if(!event.getValueIsAdjusting() && !ignore) {
		int selected_index = -1;
		if((selected_index = existing_associations_table.getSelectionModel().getMinSelectionIndex()) != -1) {
		    // Propagate the details of the selection down into the fields
		    String extension_str = file_association_manager.getExtension(selected_index);
		    extension_field.setText(extension_str);
		    command_field.setText(file_association_manager.getCommandString(extension_str));
		    extension_str = null;
		    remove_button.setEnabled(true);
		}
		else {
		    // Clear the fields
		    extension_field.setText("");
		    command_field.setText("");
		    remove_button.setEnabled(false);
		}
		add_button.setEnabled(false);
		replace_button.setEnabled(false);
	    }
	}
    }

    private class RemoveButtonListener 
	implements ActionListener {
	public void actionPerformed(ActionEvent event) {
	    file_association_manager.setCommand(extension_field.getText(), null);
	    // And update buttons
	    add_button.setEnabled(true);
	    remove_button.setEnabled(false);
	}
    }

    private class ReplaceButtonListener 
	implements ActionListener {
	public void actionPerformed(ActionEvent event) {
	    file_association_manager.setCommand(extension_field.getText(), command_field.getText());
	    // And update buttons
	    replace_button.setEnabled(false);
	}
    }
}