/**
    * Copyright 2005-2011 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.kew.config;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.config.module.RunMode;
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.core.api.lifecycle.Lifecycle;
  import org.kuali.rice.core.api.resourceloader.ResourceLoader;
  import org.kuali.rice.core.framework.persistence.jpa.OrmUtils;
  import org.kuali.rice.core.impl.config.module.ModuleConfigurer;
  import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
  import org.kuali.rice.core.api.resourceloader.ResourceLoader;
  import org.kuali.rice.core.impl.resourceloader.RiceResourceLoaderFactory;
  import org.kuali.rice.core.impl.resourceloader.RiceResourceLoaderFactory;
  import org.kuali.rice.kew.lifecycle.EmbeddedLifeCycle;
  import org.kuali.rice.kew.plugin.PluginRegistry;
  import org.kuali.rice.kew.plugin.PluginRegistryFactory;
  import org.kuali.rice.kew.resourceloader.CoreResourceLoader;
  import org.kuali.rice.kew.api.KewApiConstants.ClientProtocol;
  
  import javax.sql.DataSource;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.LinkedList;
  import java.util.List;
  
  
  /**
   * Configures the KEW Rice module.  KEW module initiation proceeds as follows:
   *
   * <ol>
   *   <li>Parse and load configuration for:</li>
   *     <ul>
   *       <li>Client Protocol</li>
   *       <li>Database</li>
   *	   </ul>
   *   </li>
   *   <li>Configure and startup KEW for "Thin Client" mode OR</li>
   *   <li>Configure and startup KEW for "Embedded Mode"</li>
   * </ol>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class KEWConfigurer extends ModuleConfigurer {
  
  	public static final String KEW_DATASOURCE_OBJ = "org.kuali.workflow.datasource";
  
  	private DataSource dataSource;
  	
  	@Override
  	public List<String> getPrimarySpringFiles() {
  		final List<String> springFileLocations;
  		if (RunMode.REMOTE.equals(getRunMode()) || RunMode.THIN.equals(getRunMode()) ||
  				ClientProtocol.WEBSERVICE.equals(getClientProtocol())) {
  			springFileLocations = Collections.emptyList();
  		} else {
  			springFileLocations = getEmbeddedSpringFileLocation();
  		}
  
  		return springFileLocations;
  	}
  	
      private List<String> getEmbeddedSpringFileLocation(){
      	final List<String> springFileLocations = new ArrayList<String>();
      	springFileLocations.add("classpath:org/kuali/rice/kew/config/KEWSpringBeans.xml");
  
          if ( isExposeServicesOnBus() ) {
              springFileLocations.add("classpath:org/kuali/rice/kew/config/KEWServiceBusSpringBeans.xml");
          }
          
          if (OrmUtils.isJpaEnabled("rice.kew")) {
          	springFileLocations.add("classpath:org/kuali/rice/kew/config/KEWJPASpringBeans.xml");
          }
          else {
          	springFileLocations.add("classpath:org/kuali/rice/kew/config/KEWOJBSpringBeans.xml");
          }
  
      	return springFileLocations;
      }
  
  	@Override
  	public List<Lifecycle> loadLifecycles() throws Exception {
  		
  		List<Lifecycle> lifecycles = new LinkedList<Lifecycle>();
 		if ( getRunMode().equals( RunMode.THIN ) ) {
 			lifecycles.add(createThinClientLifecycle());
 		} else if ( !getRunMode().equals( RunMode.REMOTE ) ) { // local or embedded
 			lifecycles.add(createEmbeddedLifeCycle());
 		}
 		return lifecycles;
 	}
 
 	/**
 	 * TODO Because a lot of our lifecycles live behind the embedded plugin and the KEWConfigurer does not, this is a simple
 	 * measure to load these without having to deal with the removal of the embedded plugin right away.
      * @return Life Cycle
      * @throws Exception if life cycle not created
      */
 	private Lifecycle createEmbeddedLifeCycle() throws Exception {
 		return new EmbeddedLifeCycle();
 	}
 
 	private Lifecycle createThinClientLifecycle() throws Exception {
 		return new ThinClientLifecycle();
 	}
 
 	@Override
 	public void addAdditonalToConfig() {
 		configureDataSource();
 	}
 
 	private void configureDataSource() {
 		if (getDataSource() != null) {
 			ConfigContext.getCurrentContextConfig().putObject(KEW_DATASOURCE_OBJ, getDataSource());
 		}
 	}
 
 	@Override
 	public Collection<ResourceLoader> getResourceLoadersToRegister() throws Exception {
 		// create the plugin registry
 		PluginRegistry registry = null;
 		String pluginRegistryEnabled = ConfigContext.getCurrentContextConfig().getProperty("plugin.registry.enabled");
 		if (!StringUtils.isBlank(pluginRegistryEnabled) && Boolean.valueOf(pluginRegistryEnabled).booleanValue()) {
 			registry = new PluginRegistryFactory().createPluginRegistry();
 		}
 
 		final Collection<ResourceLoader> rls = new ArrayList<ResourceLoader>();
 		for (ResourceLoader rl : RiceResourceLoaderFactory.getSpringResourceLoaders()) {
 			CoreResourceLoader coreResourceLoader = 
 				new CoreResourceLoader(rl, registry);
 			coreResourceLoader.start();
 
 			//wait until core resource loader is started to attach to GRL;  this is so startup
 			//code can depend on other things hooked into GRL without incomplete KEW resources
 			//messing things up.
 
 			GlobalResourceLoader.addResourceLoader(coreResourceLoader);
 
 			// now start the plugin registry if there is one
 			if (registry != null) {
 				registry.start();
 				// the registry resourceloader is now being handled by the CoreResourceLoader
 				//GlobalResourceLoader.addResourceLoader(registry);
 			}
 			rls.add(coreResourceLoader);
 		}
 
 		return rls;
 	}
 
 	private ClientProtocol getClientProtocol() {
 		return ClientProtocol.valueOf(ConfigContext.getCurrentContextConfig().getProperty("client.protocol"));
 	}
 
 	public DataSource getDataSource() {
 		return dataSource;
 	}
 
 	public void setDataSource(DataSource dataSource) {
 		this.dataSource = dataSource;
 	}
 }