// ISOKeyPicker.java
package org.eclipse.stem.ui.widgets;

/*******************************************************************************
 * Copyright (c) 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.stem.data.geography.GeographicNames;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.dialogs.FilteredList;

/**
 * This class is a SWT Composite that allows a user to specify an ISO key by
 * picking from an expandable hierarchy of country names and their
 * sub-divisions.
 */
public class ISOKeyPicker extends Composite {

	private final List<ISOKeyPickedEventListener> listeners = new CopyOnWriteArrayList<ISOKeyPickedEventListener>();

	private final Label isoKeyLevelDescription;
	private final FilteredList filteredList;
	final Text text;
	private int isoKeyLevel;

	/**
	 * Create the composite
	 * 
	 * @param parent
	 * @param style
	 */
	public ISOKeyPicker(final Composite parent, final int style,
			final int isoKeyLevel) {
		super(parent, style);
		this.isoKeyLevel = isoKeyLevel;
		setLayout(new FormLayout());

		text = new Text(this, SWT.BORDER);
		final FormData fd_text = new FormData();
		fd_text.top = new FormAttachment(0, 0);
		fd_text.left = new FormAttachment(25, 0);
		fd_text.right = new FormAttachment(100, 0);
		text.setLayoutData(fd_text);
		text.addListener(SWT.Modify, new Listener() {
			public void handleEvent(final Event event) {
				filteredList.setFilter(text.getText());
			}
		});
		isoKeyLevelDescription = new Label(this, SWT.NONE);
		isoKeyLevelDescription.setText("Label");
		FormData fd_isoKeyLevelDescription;
		fd_isoKeyLevelDescription = new FormData();
		fd_isoKeyLevelDescription.top = new FormAttachment(text, 2, SWT.TOP);
		fd_isoKeyLevelDescription.right = new FormAttachment(25, 0);
		fd_isoKeyLevelDescription.left = new FormAttachment(0, 0);
		this.isoKeyLevelDescription.setLayoutData(fd_isoKeyLevelDescription);

		filteredList = new FilteredList(this, SWT.BORDER, null, false, false,
				true);
		final FormData fd_filteredList = new FormData();
		fd_filteredList.top = new FormAttachment(text, 5, SWT.DEFAULT);
		fd_filteredList.bottom = new FormAttachment(100, 0);
		fd_filteredList.left = new FormAttachment(text, 0, SWT.LEFT);
		fd_filteredList.right = new FormAttachment(text, 0, SWT.RIGHT);
		filteredList.setLayoutData(fd_filteredList);
		filteredList.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(final SelectionEvent e) {
				final Object[] selected = filteredList.getSelection();
				// Anything selected?
				
				if (selected.length == 1) {
					final String isoKey = (String) selected[0];
					fireISOKeyPicked(isoKey);
				}
			}

			@Override
			public void widgetDefaultSelected(final SelectionEvent e) {
				widgetSelected(e);
			}
		});

		filteredList.setIgnoreCase(true);
		filteredList.setFilter("");
		filteredList.setLabelProvider(new LabelProvider() {
			@Override
			public String getText(final Object element) {
				return getName((String) element, isoKeyLevel);
			}
		});
		filteredList.setElements(new Object[] {});

		pack();
	} // ISOKeyPicker

	public void setISOKeys(final Object[] isoKeys) {
		filteredList.setElements(isoKeys);
		this.getDisplay().syncExec(new Runnable() {
			public void run() {
				text.setText("");
			}
		});
	} // setISOKeys

	public void setISOKeyLevelDescription(final String isoKeyLevelDescription) {
		this.isoKeyLevelDescription.setText(isoKeyLevelDescription);
	} // setISOKeyLevelDescription

	/**
	 * @return the iso key level
	 */
	public int getISOKeyLevel() {
		return isoKeyLevel;
	}

	public void setISOKeyLevel(final int isoKeyLevel) {
		this.isoKeyLevel = isoKeyLevel;
	} // setLevel

	private String getName(final String isoKey, final int level) {
		return GeographicNames.getName(isoKey, level);
	} // getName

	public void addISOKeyPickedListener(final ISOKeyPickedEventListener listener) {
		listeners.add(listener);
	} // addISOKeyPickedListener

	public void removeISOKeyPickedListener(
			final ISOKeyPickedEventListener listener) {
		listeners.remove(listener);
	} // removeISOKeyPickedListener

	private void fireISOKeyPicked(final String isoKey) {
		final ISOKeyPickedEvent isoKeyPickedEvent = new ISOKeyPickedEvent(this,
				isoKey);
		for (final ISOKeyPickedEventListener listener : listeners) {
			listener.isoKeyPicked(isoKeyPickedEvent);
		} // for each ISOKeyPickedEventListener
	}
	
	public Point getRegionListSize() {
		return filteredList.getSize();
	}
	
	public Rectangle getRegionListBounds() {
		return filteredList.getBounds();
	}
	
	public void setRegionListSize(int width, int height) {
		filteredList.setSize(width, height);
	}
	
	public void setRegionListBounds(int x0, int y0, int width, int height) {
		filteredList.setBounds(x0,y0,width, height);
	}
	
} // ISOKeyPicker