package dk.itu.oop.lecture11;
import java.awt.*;
import java.awt.event.*;
import java.text.*;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

import java.util.*;


/** Selecting list is a GUI component with two parts, a filter and a list.
 *  Only elements that contain the filter will be shown in the list.
 *  The selecting list has a raw list, which are the elements which
 *  are filtered.
 **/
class SelectingList extends JPanel{
	final JList list;
	final SelectingListModel listModel;
	JTextField selText;

	public SelectingList(Object[] elements){
		listModel = new SelectingListModel( elements );
		list = new JList( listModel );
		list.setSelectionMode( ListSelectionModel.SINGLE_SELECTION );
		selText = new JTextField( 12 );
		this.setLayout( new BorderLayout() );
		this.add( selText,"North" );
		this.add( new JScrollPane( list ) ,"Center" );
		selText.addCaretListener( new CaretListener(){
			public void caretUpdate(CaretEvent e){
				listModel.updateFilter( selText.getText() );
				if ( listModel.getSize() == 1 )
					list.setSelectedIndex(0);
				else
					list.clearSelection();
			}
		});

	}
}

class SelectingListModel extends AbstractListModel {
	private final Object[] rawData;
	private java.util.List filteredData = new ArrayList();
	private String filter;
	SelectingListModel(Object[] raw){
		rawData = raw;
		updateFilter("");
	}

	private boolean checkAgainstFilter(Object o){
		String data = o.toString().toLowerCase();
		String filter = this.filter.toLowerCase();
		return data.indexOf(filter) >=0;
	}
	public void updateFilter(String newFilter){
		filter = newFilter;
		filteredData.clear();
		for (int i = 0; i<rawData.length; i++)
			if ( checkAgainstFilter( rawData[i] ) )
				filteredData.add(rawData[i]);
		this.fireContentsChanged( this, 0, getSize() );
	}

	public int getSize(){
		return filteredData.size();
	}

	public Object getElementAt(int index){
		return filteredData.get(index);
	}
}