/*******************************************************************************
 * Copyright (c) 2012 Laurent CARON
 * 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:
 *     Laurent CARON (laurent.caron at gmail dot com) - initial API and implementation
 *******************************************************************************/
package org.mihalis.opal.propertyTable;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

/**
 * Instances of this class are property sheets
 * <p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>BORDER</dd>
 * <dt><b>Events:</b></dt>
 * <dd>PTPropertyChange</dd>
 * </dl>
 * </p>
 * .
 */
public class PropertyTable extends Composite {

	/** The Constant VIEW_AS_FLAT_LIST. */
	final static int VIEW_AS_FLAT_LIST = 0;
	
	/** The Constant VIEW_AS_CATEGORIES. */
	final static int VIEW_AS_CATEGORIES = 1;

	/** The show buttons. */
	boolean showButtons;
	
	/** The show description. */
	boolean showDescription;
	
	/** The sorted. */
	boolean sorted;
	
	/** The style of view. */
	int styleOfView;
	
	/** The properties. */
	final List<PTProperty> properties;
	
	/** The has been built. */
	private boolean hasBeenBuilt = false;
	
	/** The change listeners. */
	private final List<PTPropertyChangeListener> changeListeners;

	/** The widget. */
	private PTWidget widget;

	/**
	 * Constructs a new instance of this class given its parent and a style
	 * value describing its behavior and appearance.
	 * <p>
	 * The style value is either one of the style constants defined in class
	 * <code>SWT</code> which is applicable to instances of this class, or must
	 * be built by <em>bitwise OR</em>'ing together (that is, using the
	 * <code>int</code> "|" operator) two or more of those <code>SWT</code>
	 * style constants. The class description lists the style constants that are
	 * applicable to the class. Style bits are also inherited from superclasses.
	 * </p>
	 *
	 * @param parent a composite control which will be the parent of the new
	 *            instance (cannot be null)
	 * @param style the style of control to construct
	 *
	 * @exception IllegalArgumentException
	 *                <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	 *                </ul>
	 * @exception SWTException
	 *                <ul>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the parent</li>
	 *                </ul>
	 *
	 */
	public PropertyTable(final Composite parent, final int style) {
		super(parent, style);
		setLayout(new FillLayout(SWT.VERTICAL));
		showButtons = true;
		showDescription = true;
		sorted = true;
		styleOfView = VIEW_AS_CATEGORIES;
		properties = new ArrayList<PTProperty>();
		changeListeners = new ArrayList<PTPropertyChangeListener>();

		widget = PTWidgetFactory.build(this);

		addListener(SWT.Resize, new Listener() {
			@Override
			public void handleEvent(final Event event) {
				// Draw the widget on first displaying
				if (!hasBeenBuilt) {
					widget.build();
					hasBeenBuilt = true;
				}
			}
		});

	}

	/**
	 * Add a change listener (event fired when the value of a property is
	 * changed).
	 *
	 * @param listener the listener
	 */
	public void addChangeListener(final PTPropertyChangeListener listener) {
		changeListeners.add(listener);
	}

	/**
	 * Add a property in this widget.
	 *
	 * @param property property to add
	 * @return the property
	 */
	public PTProperty addProperty(final PTProperty property) {
		if (properties.contains(property)) {
			throw new IllegalArgumentException("A property called '" + property.getName() + "' has already been declared.");
		}

		properties.add(property);
		property.setParentTable(this);
		return property;
	}

	/**
	 * Fire the event "a value of a property has changed".
	 *
	 * @param property property which value has changed
	 */
	public void firePTPropertyChangeListeners(final PTProperty property) {
		for (final PTPropertyChangeListener listener : changeListeners) {
			listener.propertyHasChanged(property);
		}
	}

	/**
	 * Gets the properties.
	 *
	 * @return the values stored in this object in a map. Keys are property's
	 *         name, values are values stored in a the property.
	 */
	public Map<String, Object> getProperties() {
		final Map<String, Object> map = new HashMap<String, Object>();
		for (final PTProperty prop : properties) {
			map.put(prop.getName(), prop.getValue());
		}
		return map;
	}

	/**
	 * Gets the properties as list.
	 *
	 * @return the properties stored in a list
	 */
	public List<PTProperty> getPropertiesAsList() {
		return new ArrayList<PTProperty>(properties);
	}

	/**
	 * Hide all buttons.
	 *
	 * @return this property table
	 */
	public PropertyTable hideButtons() {
		showButtons = false;
		return rebuild();
	}

	/**
	 * Hide description.
	 *
	 * @return this property table
	 */
	public PropertyTable hideDescription() {
		showDescription = false;
		return rebuild();
	}

	/**
	 * Rebuild the whole table.
	 *
	 * @return this property table
	 */
	private PropertyTable rebuild() {
		widget = widget.disposeAndBuild(this);
		if (hasBeenBuilt) {
			setLayout(new FillLayout());
			widget.build();
			layout();
		}
		return this;
	}

	/**
	 * Update the component when some values has changed.
	 */
	public void refreshValues() {
		rebuild();
	}

	/**
	 * Remove a change listener.
	 *
	 * @param listener listener to remove
	 */
	public void removeChangeListener(final PTPropertyChangeListener listener) {
		changeListeners.remove(listener);
	}

	/**
	 * Sets the properties.
	 *
	 * @param newValues the new values
	 */
	public void setProperties(final Map<String, Object> newValues) {
		for (final PTProperty prop : properties) {
			if (newValues == null) {
				prop.setValue(null);
			} else {
				final Object value = newValues.get(prop.getName());
				prop.setValue(value);
			}
		}
		rebuild();
	}

	/**
	 * Show all buttons.
	 *
	 * @return this property table
	 */
	public PropertyTable showButtons() {
		showButtons = true;
		return rebuild();
	}

	/**
	 * Show description.
	 *
	 * @return this property table
	 */
	public PropertyTable showDescription() {
		showDescription = true;
		return rebuild();
	}

	/**
	 * Sort the properties.
	 *
	 * @return this property table
	 */
	public PropertyTable sort() {
		sorted = true;
		widget.refillData();
		return this;
	}

	/**
	 * Show properties not sorted.
	 *
	 * @return this property table
	 */
	public PropertyTable unsort() {
		sorted = false;
		widget.refillData();
		return this;

	}

	/**
	 * View the properties as categories.
	 *
	 * @return this property table
	 */
	public PropertyTable viewAsCategories() {
		styleOfView = VIEW_AS_CATEGORIES;
		return rebuild();
	}

	/**
	 * View the properties as a flat list.
	 *
	 * @return this property table
	 */
	public PropertyTable viewAsFlatList() {
		styleOfView = VIEW_AS_FLAT_LIST;
		return rebuild();
	}
}