/**
 * Copyright (c) 2011 itemis AG 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:
 * 	itemis AG - initial API and implementation
 * 
 */
package de.itemis.gmf.runtime.commons.properties;

import java.util.ArrayList;
import java.util.Iterator;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
import org.eclipse.emf.edit.provider.IItemPropertySource;
import org.eclipse.emf.edit.ui.provider.PropertySource;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.emf.transaction.util.TransactionUtil;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.diagram.ui.properties.sections.AdvancedPropertySection;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.views.properties.IPropertySource;
import org.eclipse.ui.views.properties.IPropertySourceProvider;

/**
 * Copied from GMF Tooling generated code. Property Section, that uses
 * {@link IItemPropertySource} generated by EMF (edit plugin) to display
 * semantic model information in the property section.
 * 
 * @author andreas muelder (andreas.muelder@itemis.de)
 * 
 */
public class SemanticPropertySection extends AdvancedPropertySection implements
		IPropertySourceProvider {

	public IPropertySource getPropertySource(final Object object) {
		if (object instanceof IPropertySource) {
			return (IPropertySource) object;
		}
		final AdapterFactory af = getAdapterFactory(object);
		if (af != null) {
			final IItemPropertySource ips = (IItemPropertySource) af.adapt(
					object, IItemPropertySource.class);
			if (ips != null) {
				return new PropertySource(object, ips);
			}
		}
		if (object instanceof IAdaptable) {
			return (IPropertySource) ((IAdaptable) object)
					.getAdapter(IPropertySource.class);
		}
		return null;
	}

	@Override
	protected IPropertySourceProvider getPropertySourceProvider() {
		return this;
	}

	/**
	 * Modify/unwrap selection.
	 */
	protected Object transformSelection(final Object selected) {

		if (selected instanceof EditPart) {
			final Object model = ((EditPart) selected).getModel();
			return model instanceof View ? ((View) model).getElement() : null;
		}
		if (selected instanceof View) {
			return ((View) selected).getElement();
		}
		if (selected instanceof IAdaptable) {
			final View view = (View) ((IAdaptable) selected)
					.getAdapter(View.class);
			if (view != null) {
				return view.getElement();
			}
		}
		return selected;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	@Override
	public void setInput(final IWorkbenchPart part, final ISelection selection) {
		if (selection.isEmpty()
				|| false == selection instanceof StructuredSelection) {
			super.setInput(part, selection);
			return;
		}
		final StructuredSelection structuredSelection = ((StructuredSelection) selection);
		final ArrayList transformedSelection = new ArrayList(
				structuredSelection.size());
		for (final Iterator it = structuredSelection.iterator(); it.hasNext();) {
			final Object r = transformSelection(it.next());
			if (r != null) {
				transformedSelection.add(r);
			}
		}
		super.setInput(part, new StructuredSelection(transformedSelection));
	}

	protected AdapterFactory getAdapterFactory(final Object object) {
		if (getEditingDomain() instanceof AdapterFactoryEditingDomain) {
			return ((AdapterFactoryEditingDomain) getEditingDomain())
					.getAdapterFactory();
		}
		final TransactionalEditingDomain editingDomain = TransactionUtil
				.getEditingDomain(object);
		if (editingDomain != null) {
			return ((AdapterFactoryEditingDomain) editingDomain)
					.getAdapterFactory();
		}
		return null;
	}
}
