/*
    * ModeShape (http://www.modeshape.org)
    * See the COPYRIGHT.txt file distributed with this work for information
    * regarding copyright ownership.  Some portions may be licensed
    * to Red Hat, Inc. under one or more contributor license agreements.
    * See the AUTHORS.txt file in the distribution for a full listing of 
    * individual contributors.
    *
    * ModeShape is free software. Unless otherwise indicated, all code in ModeShape
   * is licensed to you under the terms of the GNU Lesser General Public License as
   * published by the Free Software Foundation; either version 2.1 of
   * the License, or (at your option) any later version.
   * 
   * ModeShape is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this software; if not, write to the Free
   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
   */
  package org.modeshape.rhq.plugin;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.jboss.managed.api.ManagedComponent;
  import org.jboss.metatype.api.values.CollectionValueSupport;
  import org.jboss.metatype.api.values.CompositeValueSupport;
  import org.jboss.metatype.api.values.MetaValue;
  import org.jboss.metatype.api.values.MetaValueFactory;
  import org.modeshape.jboss.managed.ManagedEngine;
  import org.modeshape.rhq.plugin.util.ModeShapeManagementView;
  import org.modeshape.rhq.plugin.util.PluginConstants;
  import org.modeshape.rhq.plugin.util.ProfileServiceUtil;
  import org.rhq.core.domain.configuration.Configuration;
  import org.rhq.core.domain.configuration.PropertyList;
  import org.rhq.core.domain.configuration.PropertyMap;
  import org.rhq.core.domain.configuration.PropertySimple;
  import org.rhq.core.pluginapi.inventory.DiscoveredResourceDetails;
  import org.rhq.core.pluginapi.inventory.InvalidPluginConfigurationException;
  import org.rhq.core.pluginapi.inventory.ResourceDiscoveryComponent;
  import org.rhq.core.pluginapi.inventory.ResourceDiscoveryContext;
  
  /**
   * 
   */
  public class ConnectorDiscoveryComponent implements
  		ResourceDiscoveryComponent<ConnectorComponent> {
  
  	private final Log log = LogFactory
  			.getLog(PluginConstants.DEFAULT_LOGGER_CATEGORY);
  
  	/**
  	 * {@inheritDoc}
  	 * 
  	 * @see org.rhq.core.pluginapi.inventory.ResourceDiscoveryComponent#discoverResources(org.rhq.core.pluginapi.inventory.ResourceDiscoveryContext)
  	 */
  	public Set<DiscoveredResourceDetails> discoverResources(
  			ResourceDiscoveryContext discoveryContext)
  			throws InvalidPluginConfigurationException, Exception {
  
  		Set<DiscoveredResourceDetails> discoveredResources = new HashSet<DiscoveredResourceDetails>();
  
  		ManagedComponent mc = ProfileServiceUtil
  				.getManagedEngine(
  						((EngineComponent) discoveryContext
  								.getParentResourceComponent()).getConnection());
  
  		String operation = "getConnectors";
  
  		MetaValue connectors = ModeShapeManagementView.executeManagedOperation(
  				mc, operation, new MetaValue[] { null });
  
  		if (connectors == null) {
  			return discoveredResources;
  		}
  
  		MetaValue[] mvConnectorArray = ((CollectionValueSupport) connectors)
  				.getElements();
  
  		for (MetaValue value : mvConnectorArray) {
  
  			CompositeValueSupport cvs = (CompositeValueSupport) value;
  			String name = ProfileServiceUtil.stringValue(cvs.get("name"));
  
  			/**
  			 * 
  			 * A discovered resource must have a unique key, that must stay the
  			 * same when the resource is discovered the next time
  			 */
  			DiscoveredResourceDetails detail = new DiscoveredResourceDetails(
  					discoveryContext.getResourceType(), // ResourceType
  					name, // Resource Key
  					name, // Resource name
 					null,
 					PluginConstants.ComponentType.Connector.DESCRIPTION, // Description
 					discoveryContext.getDefaultPluginConfiguration(), // Plugin
 																		// config
 					null // Process info from a process scan
 			);
 
 			Configuration c = detail.getPluginConfiguration();
 
 
 			//Load connector properties
 			operation = "getProperties";
 
 			MetaValue[] args = new MetaValue[] {
 					MetaValueFactory.getInstance().create(name),
 					MetaValueFactory.getInstance().create(
 							ManagedEngine.Component.CONNECTOR) };
 
 			MetaValue properties = ModeShapeManagementView
 					.executeManagedOperation(mc, operation, args);
 
 			MetaValue[] propertyArray = ((CollectionValueSupport) properties)
 					.getElements();
 
 			PropertyList connectorlist = new PropertyList("connectorPropertyList");
 			c.put(connectorlist);
 			loadProperties(propertyArray, connectorlist);
 
 			//Load connection pool properties
 			args = new MetaValue[] {
 					MetaValueFactory.getInstance().create(name),
 					MetaValueFactory.getInstance().create(
 							ManagedEngine.Component.CONNECTIONPOOL) };
 
 			properties = ModeShapeManagementView
 					.executeManagedOperation(mc, operation, args);
 
 			propertyArray = ((CollectionValueSupport) properties)
 					.getElements();
 			PropertyList connectionPoollist = new PropertyList("connectionpoolPropertyList");
 			c.put(connectionPoollist);
 			loadProperties(propertyArray, connectionPoollist);
 			
 			detail.setPluginConfiguration(c);
 
 			// Add to return values
 			discoveredResources.add(detail);
 			log.info("Discovered ModeShape repositories: " + mc.getName());
 		}
 
 		return discoveredResources;
 
 	}
 
 	/**
 	 * @param propertyArray
 	 * @param list
 	 * @throws Exception
 	 */
 	private void loadProperties(MetaValue[] propertyArray, PropertyList list)
 			throws Exception {
 		PropertyMap propMap;
 		for (MetaValue property : propertyArray) {
 
 			CompositeValueSupport proCvs = (CompositeValueSupport) property;
 			propMap = new PropertyMap("map");
 			propMap.put(new PropertySimple("label", ProfileServiceUtil
 					.stringValue(proCvs.get("label"))));
 			propMap.put(new PropertySimple("value", ProfileServiceUtil
 					.stringValue(proCvs.get("value"))));
 			propMap.put(new PropertySimple("description", ProfileServiceUtil
 					.stringValue(proCvs.get("description"))));
 			list.add(propMap);
 		}
 	}
 }