/*
 * Created on 12-Sep-2005 by Ryan McNally
 */

package com.ryanm.config.swing.imp;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;

import com.ryanm.config.Configurator;
import com.ryanm.config.swing.Widget;

/**
 * Widget for controlling a list of strings
 * 
 * @author ryanm
 */
public class StringListWidget extends Widget<String[]>
{
	private final JList list = new JList();

	/**
	 * Holds the controls used to add entries to the list
	 */
	private final JPanel entryPanel = new JPanel();

	private JComponent entryComponent = null;

	/**
	 * Causes the current list selection to be removed
	 */
	private final JButton remove = new JButton( "Remove selection" );

	/**
	 * Constructs a new StringListWidget
	 * 
	 * @param conf
	 *           The configurator
	 * @param name
	 *           The name of the variable
	 */
	public StringListWidget( Configurator conf, String name )
	{
		super( conf, name );

		setBorder( new TitledBorder( name ) );

		entryPanel.setBorder( new TitledBorder( "Add element" ) );
		entryPanel.setLayout( new BorderLayout() );

		setLayout( new BorderLayout() );

		add( entryPanel, BorderLayout.NORTH );
		add( new JScrollPane( list ), BorderLayout.CENTER );

		JPanel spoof = new JPanel( new BorderLayout() );
		spoof.add( remove, BorderLayout.CENTER );
		add( spoof, BorderLayout.SOUTH );

		setRange( conf.getRange( name ) );

		remove.addActionListener( new ActionListener() {

			public void actionPerformed( ActionEvent e )
			{
				final int[] selectedIndices = list.getSelectedIndices();

				if( selectedIndices.length > 0 )
				{
					synchronized( lock )
					{
						String[] contents =
								( String[] ) StringListWidget.this.conf
										.getValue( StringListWidget.this.name );

						Arrays.sort( contents );

						String[] newContents = new String[ contents.length - selectedIndices.length ];

						int index = 0;
						for( int i = 0; i < contents.length; i++ )
						{
							if( Arrays.binarySearch( selectedIndices, i ) < 0 )
							{
								newContents[ index++ ] = contents[ i ];
							}
						}

						applyChange( StringListWidget.this.conf, StringListWidget.this.name, newContents );
					}

					list.setSelectedIndices( new int[ 0 ] );
				}
			}

		} );

		refreshValue();

		setEnabled( conf.isGUIEnabled( name ) );
	}

	/**
	 * 
	 *
	 */
	public StringListWidget()
	{
	}

	@Override
	public void updateValue()
	{
		String[] array = ( String[] ) conf.getValue( name );

		Arrays.sort( array );

		list.setListData( array );
	}

	@Override
	public void updateRange( Object range )
	{
		range = conf.getRange( name );

		String[] possibles;

		if( range instanceof String )
		{
			possibles = new String[] { ( String ) range };
		}
		else if( range instanceof String[] )
		{
			possibles = ( String[] ) range;
		}
		else if( range == null )
		{
			possibles = null;
		}
		else
		{
			throw new IllegalArgumentException( "Non-string range object " + range
					+ " found for variable " + conf.getPath() + "/" + name + "\n" );
		}

		entryPanel.removeAll();

		if( possibles == null )
		{
			final JTextField tf = new JTextField();
			tf.addActionListener( new ActionListener() {

				public void actionPerformed( ActionEvent e )
				{
					final String s = tf.getText();

					if( s.length() > 0 )
					{
						synchronized( lock )
						{
							String[] contents = ( String[] ) conf.getValue( name );

							String[] newContents = new String[ contents.length + 1 ];

							System.arraycopy( contents, 0, newContents, 0, contents.length );

							newContents[ newContents.length - 1 ] = s;

							Arrays.sort( newContents );

							applyChange( conf, name, newContents );
						}

					}
					tf.setText( null );
				}

			} );

			entryComponent = tf;
			entryPanel.add( tf, BorderLayout.CENTER );
		}
		else
		{
			Arrays.sort( possibles );
			final JComboBox combo = new JComboBox( possibles );
			combo.setSelectedItem( null );

			combo.addActionListener( new ActionListener() {

				public void actionPerformed( ActionEvent ae )
				{
					final String s = ( String ) combo.getSelectedItem();
					if( s != null )
					{
						String[] contents = ( String[] ) conf.getValue( name );

						String[] newContents = new String[ contents.length + 1 ];

						System.arraycopy( contents, 0, newContents, 0, contents.length );

						newContents[ newContents.length - 1 ] = s;

						Arrays.sort( newContents );

						conf.setValue( name, newContents );
						applyChange( conf, name, newContents );
					}
					combo.setSelectedItem( null );
				}

			} );

			entryComponent = combo;
			entryPanel.add( combo, BorderLayout.CENTER );
		}
	}

	@Override
	public void setEnabled( boolean b )
	{
		list.setEnabled( b );
		entryComponent.setEnabled( b );
		remove.setEnabled( b );
	}

	@Override
	public Widget newWidget( Configurator conf, String name, Class<? extends String[]> runtimeType )
	{
		return new StringListWidget( conf, name );
	}

	@Override
	public Class getType()
	{
		return String[].class;
	}
}