/*
    * 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.Collection;
  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.ComponentType;
  import org.jboss.managed.api.ManagedComponent;
  import org.jboss.metatype.api.types.EnumMetaType;
  import org.jboss.metatype.api.values.CollectionValueSupport;
  import org.jboss.metatype.api.values.CompositeValueSupport;
  import org.jboss.metatype.api.values.EnumValueSupport;
  import org.jboss.metatype.api.values.MetaValue;
  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 SequencerDiscoveryComponent implements
  		ResourceDiscoveryComponent<SequencerComponent> {
  
  	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
  				.getManagedComponent(
  						((EngineComponent) discoveryContext
  								.getParentResourceComponent()).getConnection(),
  						new ComponentType(
  								PluginConstants.ComponentType.SequencingService.MODESHAPE_TYPE,
  								PluginConstants.ComponentType.SequencingService.MODESHAPE_SUB_TYPE),
  						PluginConstants.ComponentType.SequencingService.NAME);
  
  		if (mc == null) {
  			return discoveredResources;
  		}
  		
  		String operation = "getSequencers";
  
  		MetaValue sequencers = ModeShapeManagementView.executeManagedOperation(
  				mc, operation, new MetaValue[] { null });
  
  		if (sequencers == null) {
  			return discoveredResources;
  		}
  
  		Collection<MetaValue> sequencerCollection = ModeShapeManagementView
  				.getSequencerCollectionValue(sequencers);
  
  		for (MetaValue managedSequencer : sequencerCollection) {
  
  			MetaValue name = ((CompositeValueSupport)managedSequencer).get("name");
 			MetaValue description = ((CompositeValueSupport)managedSequencer).get("description");
 
 			/**
 			 * 
 			 * 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
 					ProfileServiceUtil.stringValue(name), // Resource Key
 					ProfileServiceUtil.stringValue(name), // Resource name
 					null, // version
 					ProfileServiceUtil.stringValue(description), // Description
 					discoveryContext.getDefaultPluginConfiguration(), // Plugin config
 					null // Process info from a process scan
 			);
 			
 			Configuration c = detail.getPluginConfiguration();
 
 			operation = "getProperties";
 
 			EnumValueSupport enumVs = new EnumValueSupport(new EnumMetaType(ManagedEngine.Component.values()), ManagedEngine.Component.SEQUENCER);
 			
 			MetaValue[] args = new MetaValue[] {
 					name,
 					enumVs };
 			
 			MetaValue properties = ModeShapeManagementView
 					.executeManagedOperation(mc, operation, args);
 
 			MetaValue[] propertyArray = ((CollectionValueSupport) properties)
 					.getElements();
 
 			PropertyList list = new PropertyList("propertyList");
 			PropertyMap propMap = null;
 			c.put(list);
 			
 			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);
 			}
 
 
 			// Add to return values
 			discoveredResources.add(detail);
 			log.debug("Discovered ModeShape Sequencer: " + name);
 		}
 
 		return discoveredResources;
 
 	}
 }