/*******************************************************************************
 * Copyright (c) 2009 Markus Alexander Kuppe.
 * 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:
 *     Markus Alexander Kuppe (ecf-dev_eclipse.org <at> lemmster <dot> de) - initial API and implementation
 ******************************************************************************/
package org.eclipse.ecf.remoteservice.ui.dosgi.handlers;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.ecf.discovery.IServiceInfo;
import org.eclipse.ecf.discovery.IServiceProperties;
import org.eclipse.ecf.discovery.ui.DiscoveryHandlerUtil;
import org.eclipse.ecf.internal.remoteservices.ui.Activator;
import org.eclipse.ecf.internal.remoteservices.ui.handlers.ReflectiveRemoteServiceHandler;
import org.eclipse.ecf.osgi.services.discovery.RemoteServicePublication;
import org.eclipse.ecf.osgi.services.discovery.ServicePublication;
import org.eclipse.ecf.osgi.services.distribution.IDistributionConstants;
import org.eclipse.ecf.remoteservice.IRemoteService;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;

public class DOSGiReflectiveRemoteServiceHandler extends
		ReflectiveRemoteServiceHandler {
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands
	 * .ExecutionEvent)
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {
		final IServiceInfo serviceInfo = DiscoveryHandlerUtil
				.getActiveIServiceInfoChecked(event);
		final IServiceProperties serviceProperties = serviceInfo
				.getServiceProperties();

		final String clazz = serviceProperties
				.getPropertyString(ServicePublication.SERVICE_INTERFACE_NAME);
		final String serviceId = new String(
				serviceProperties
						.getPropertyBytes(org.eclipse.ecf.remoteservice.Constants.SERVICE_ID));
		final String containerId = new String(
				serviceProperties
						.getPropertyBytes(RemoteServicePublication.ENDPOINT_CONTAINERID));

		// get the service via the osgi service registry
		final BundleContext context = Activator.getDefault().getBundle()
				.getBundleContext();
		final Filter filter;
		try {
			filter = context.createFilter("(&(" + Constants.OBJECTCLASS + "=" //$NON-NLS-1$ //$NON-NLS-2$
					+ clazz + ")" + "(" + IDistributionConstants.SERVICE_IMPORTED + "=*" //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
					+ ")" + "(" + ServicePublication.ENDPOINT_ID + "=" //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
					+ containerId + "#" + serviceId + "))"); //$NON-NLS-1$ //$NON-NLS-2$
		} catch (InvalidSyntaxException e1) {
			MessageDialog.openError(null, Messages.DOSGiReflectiveRemoteServiceHandler_HandlerInvocationFailed,
					NLS.bind(Messages.DOSGiReflectiveRemoteServiceHandler_FilterCreationFailed, e1.getMessage()));
			return null;
		}
		final ServiceTracker serviceTracker = new ServiceTracker(context,
				filter, null);
		serviceTracker.open();
		final ServiceReference serviceReference = serviceTracker
				.getServiceReference();
		if (serviceReference == null) {
			MessageDialog.openError(null, Messages.DOSGiReflectiveRemoteServiceHandler_HandlerInvocationFailed,
					NLS.bind(Messages.DOSGiReflectiveRemoteServiceHandler_NoServiceMatch
							,filter.toString()));
			return null;
		}

		// obtain the remote service reference from the local service ref (cool
		// ECF feature, huh?)
		final IRemoteService remoteService = (IRemoteService) serviceReference
				.getProperty(IDistributionConstants.SERVICE_IMPORTED);
		if (remoteService == null) {
			MessageDialog.openError(null,
					Messages.DOSGiReflectiveRemoteServiceHandler_HandlerInvocationFailed, Messages.DOSGiReflectiveRemoteServiceHandler_RemoteServiceUnresolveable);
			return null;
		}

		try {
			executeMethodInvocationDialog(Class.forName(clazz), remoteService);
		} catch (ClassNotFoundException e) {
			MessageDialog.openError(null,
					Messages.DOSGiReflectiveRemoteServiceHandler_HandlerInvocationFailed, e.getLocalizedMessage());
			throw new ExecutionException(e.getMessage(), e);
		}
		return null;
	}

}