/*******************************************************************************
 * Copyright (c) 2009,2011 Mia-Software.
 * 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:
 *    Gregoire DUPE (Mia-Software) - initial API and implementation
 *******************************************************************************/
package org.eclipse.modisco.facet.efacet.ui.internal.actions;

import java.util.Arrays;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EPackage.Registry;
import org.eclipse.emf.ecore.provider.EcoreEditPlugin;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.edit.ui.action.LoadResourceAction;
import org.eclipse.emf.edit.ui.provider.ExtendedImageRegistry;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.modisco.facet.common.ui.internal.widgets.AnywhereFilterMatcher;
import org.eclipse.modisco.facet.efacet.ui.internal.Messages;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.ElementListSelectionDialog;

// This class has been copied from org.eclipse.modisco.facet.infra.facet.editor.presentation.LoadMetaModelResourceAction

/**
 * @author Gregoire Dupe
 * 
 */
public class LoadMetaModelResourceAction extends LoadResourceAction {

	public LoadMetaModelResourceAction() {
		super();
		setText(Messages.Load_MetaModel_Resource);
	}

	@Override
	public void run() {
		Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();

		RegisteredPackageDialog registeredPackageDialog = new RegisteredPackageDialog(shell);
		registeredPackageDialog.open();
		Object[] results = registeredPackageDialog.getResult();
		// if user cancel the selection of meta models, results = null
		if (results != null) {
			ResourceSet resourceSet = this.domain.getResourceSet();
			for (Object result : results) {
				URI uri = URI.createURI(result.toString());
				Resource r = resourceSet.getResource(uri, true);
				if (!resourceSet.getResources().contains(r)) {
					Registry packageRegistry = resourceSet.getPackageRegistry();
					for (EObject eObject : r.getContents()) {
						if (eObject instanceof EPackage) {
							EPackage ePackage = (EPackage) eObject;
							packageRegistry.put(ePackage.getNsURI(), ePackage);
						}
					}
					resourceSet.getResources().add(r);
				}
			}
		}
	}

	public class RegisteredPackageDialog extends ElementListSelectionDialog {

		public RegisteredPackageDialog(final Shell parent) {
			super(parent, new LabelProvider() {
				@Override
				public Image getImage(final Object element) {
					return ExtendedImageRegistry.getInstance().getImage(EcoreEditPlugin.INSTANCE.getImage("full/obj16/EPackage")); //$NON-NLS-1$
				}
			});

			setMultipleSelection(true);
			setMessage(Messages.Select_Registered_URI);
			setTitle(Messages.Package_Selection);
			Object[] result = EPackage.Registry.INSTANCE.keySet().toArray(new Object[EPackage.Registry.INSTANCE.size()]);
			Arrays.sort(result);
			setElements(result);
		}

		@Override
		protected Control createDialogArea(final Composite parent) {
			Composite composite = (Composite) super.createDialogArea(parent);
			this.fFilteredList.setFilterMatcher(new AnywhereFilterMatcher());
			return composite;
		}
	}

}