/**
    * This file Copyright (c) 2003-2014 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.commands;
  
  import java.util.Iterator;
  
  import javax.inject.Singleton;
  
  import info.magnolia.cms.beans.config.ObservedManager;
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.content2bean.Content2BeanException;
  import info.magnolia.content2bean.Content2BeanUtil;
  import info.magnolia.objectfactory.Components;
  
  import org.apache.commons.chain.Catalog;
  import org.apache.commons.chain.CatalogFactory;
  import org.apache.commons.chain.Command;
  import org.apache.commons.lang.StringUtils;
  
  
  /**
   * Manages the Commands and Catalogs.
   *
   * @author Philipp Bracher
   * @version $Revision$ ($Author$)
   */
  @Singleton
  public class CommandsManager extends ObservedManager {
  
      public static final String DEFAULT_CATALOG = "default";
  
      public static final String COMMAND_DELIM = "-";
  
      private final CommandTransformer commandTransformer;
  
      public CommandsManager() {
          this.commandTransformer = new CommandTransformer();
      }
  
      /**
       * Register observation for command catalogs.
       */
      @Override
      protected void onRegister(Content node) {
          // is this a catalog or a collection of catalogs?
          if(node.getChildren(ItemType.CONTENT).size() == 0){
              registerCatalog(node);
          }
          else{
              for (Iterator iter = node.getChildren(ItemType.CONTENT).iterator(); iter.hasNext();) {
                  onRegister((Content) iter.next());
              }
          }
      }
  
      protected void registerCatalog(Content node) {
          try {
              MgnlCatalog catalog = (MgnlCatalog) Content2BeanUtil.toBean(node, true, commandTransformer);
              CatalogFactory factory = CatalogFactory.getInstance();
              if (factory.getCatalog(catalog.getName()) == null) {
                  factory.addCatalog(catalog.getName(), catalog);
              } else {
                  // runtime because this code is called by observation and there's no place to catch it anyway
                  throw new RuntimeException("Catalog [" + catalog.getName() + "] is already registered. Please run: select * from nt:base where jcr:path like '/modules/%/commands/"+ catalog.getName()+"' on config repository to find out the duplicate.");
              }
  
              log.debug("Catalog {} registered: {}", new Object[]{catalog.getName(), catalog});
         }
         catch (Content2BeanException e) {
             log.error("Can't create catalog [" + node  + "]", e);
         }
     }
 
     /**
      * Clear all catalogs.
      */
     @Override
     protected void onClear() {
         CatalogFactory.clear();
     }
 
     /**
      * Get the command.
      * @param catalogName the catalog containing the command
      * @param commandName the name of the command
      * @return the command to execute
      */
     public Command getCommand(String catalogName, String commandName) {
         Catalog catalog = CatalogFactory.getInstance().getCatalog(catalogName);
         if (catalog != null) {
             return catalog.getCommand(commandName);
         }
 
         return null;
     }
 
     /**
      * Use a delimiter to separate the catalog and command name.
      * @param commandName
      * @return the command
      */
     public Command getCommand(String commandName) {
         String catalogName = DEFAULT_CATALOG;
         if (StringUtils.contains(commandName, COMMAND_DELIM)) {
             catalogName = StringUtils.substringBefore(commandName, COMMAND_DELIM);
             commandName = StringUtils.substringAfter(commandName, COMMAND_DELIM);
         }
 
         Command command = getCommand(catalogName, commandName);
         if (command == null) {
             command = getCommand(DEFAULT_CATALOG, commandName);
         }
         return command;
     }
 
     /**
      * @return Returns the instance.
      * @deprecated since 4.5, use IoC !
      */
     public static CommandsManager getInstance() {
         return Components.getSingleton(CommandsManager.class);
     }
 
 }