/**
    * Copyright 2005-2013 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.config.module.ModuleConfigurer;
  import org.kuali.rice.core.framework.config.module.WebModuleConfiguration;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.kuali.rice.kew.lifecycle.StandaloneLifeCycle;
  import org.kuali.rice.kew.plugin.PluginRegistry;
  import org.kuali.rice.kew.plugin.PluginRegistryFactory;
  
  import javax.sql.DataSource;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  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;
  
      public KEWConfigurer() {
          super(KewApiConstants.Namespaces.MODULE_NAME);
          setValidRunModes(Arrays.asList(RunMode.THIN, RunMode.REMOTE, RunMode.EMBEDDED, RunMode.LOCAL));
      }
  
  	@Override
  	public List<String> getPrimarySpringFiles() {
          List<String> springFileLocations = new ArrayList<String>();
          if (RunMode.THIN == getRunMode()) {
              springFileLocations.add(getDefaultConfigPackagePath() + "KewThinSpringBeans.xml");
          } else if (RunMode.REMOTE == getRunMode()) {
              springFileLocations.add(getDefaultConfigPackagePath() + "KewRemoteSpringBeans.xml");
          } else if (RunMode.EMBEDDED == getRunMode()) {
              springFileLocations.add(getDefaultConfigPackagePath() + "KewEmbeddedSpringBeans.xml");
          } else if (RunMode.LOCAL == getRunMode()) {
              springFileLocations.add(getDefaultConfigPackagePath() + "KewLocalSpringBeans.xml");
          }
  		return springFileLocations;
  	}
  	
  	@Override
  	public List<Lifecycle> loadLifecycles() throws Exception {
  		
  		List<Lifecycle> lifecycles = new LinkedList<Lifecycle>();
          if ( getRunMode().equals( RunMode.LOCAL ) ) { // local or embedded
  			lifecycles.add(createStandaloneLifeCycle());
  		}
  		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 createStandaloneLifeCycle() throws Exception {
  		return new StandaloneLifeCycle();
  	}
  
 	@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 {
         List<ResourceLoader> resourceLoaders = new ArrayList<ResourceLoader>();
 		String pluginRegistryEnabled = ConfigContext.getCurrentContextConfig().getProperty("plugin.registry.enabled");
 		if (!StringUtils.isBlank(pluginRegistryEnabled) && Boolean.valueOf(pluginRegistryEnabled).booleanValue()) {
     		// create the plugin registry
 			PluginRegistry registry = new PluginRegistryFactory().createPluginRegistry();
             registry.start();
             resourceLoaders.add(registry);
 		}
         return resourceLoaders;
 	}
 
 	public DataSource getDataSource() {
 		return dataSource;
 	}
 
 	public void setDataSource(DataSource dataSource) {
 		this.dataSource = dataSource;
 	}
 
     @Override
     public boolean hasWebInterface() {
         return true;
     }
 
     @Override
     protected WebModuleConfiguration loadWebModule() {
         WebModuleConfiguration configuration = super.loadWebModule();
         configuration.setWebSpringFiles(Arrays.asList(getDefaultConfigPackagePath() + "KewWebSpringBeans.xml"));
         return configuration;
     }
 }