/**
    * 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.cms.license;
  
  import info.magnolia.objectfactory.Components;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang.StringUtils;
  import org.jdom.Document;
  import org.jdom.Element;
  import org.jdom.input.SAXBuilder;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.InputStream;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import javax.inject.Singleton;
  
  
  /**
   * Extracts license information from the info/magnolia/cms/license/license.xml file.
   *
   * @version $Id$
   */
  @Singleton
  public class LicenseFileExtractor {
      private static final Logger log = LoggerFactory.getLogger(LicenseFileExtractor.class);
  
      public static final String VERSION_NUMBER = "VersionNumber";
  
      /**
       * Same as VERSION_NUMBER, but read from the manifest.
       */
      public static final String IMPLEMENTATION_VERSION = "ImplementationVersion";
  
      public static final String BUILD_NUMBER = "BuildNumber";
  
      public static final String PROVIDER = "Provider";
  
      public static final String PROVIDER_ADDRESS = "ProviderAddress";
  
      public static final String PROVIDER_EMAIL = "ProviderEmail";
  
      public static final String EDITION = "Edition";
  
      public static final String PRODUCT_DOMAIN = "ProductDomain";
  
      private static final String LICENSE_FILE_PATH = "info/magnolia/cms/license/license.xml";
  
      private static final String ELEMENT_META = "Meta";
  
      private static final String NOT_DEFINED = "Not Defined";
  
      private static final String OS_NAME = "OSName";
  
      private Map<String, String> values = new HashMap<String, String> ();
  
      public static LicenseFileExtractor getInstance() {
          return Components.getComponent(LicenseFileExtractor.class);
      }
  
      public String get(String id) {
          if (values.containsKey(id)) {
              return values.get(id);
          }
          return NOT_DEFINED;
     }
 
     public Map<String, String> getEntries() {
         return values;
     }
 
     public String getOSName() {
         String osName = System.getProperty("os.name");
         return osName.replaceAll(" ", "-");
     }
 
     public void init() {
         InputStream in = getClass().getClassLoader().getResourceAsStream(LICENSE_FILE_PATH);
         this.init(in);
     }
 
     public void init(InputStream in) {
         try {
             SAXBuilder builder = new SAXBuilder();
             Document document = builder.build(in);
             this.load(document);
         }
         catch (Exception e) {
             log.error("failed to load license information");
             log.error(e.getMessage(), e);
         }
         finally {
             IOUtils.closeQuietly(in);
         }
     }
 
     /**
      * Returns the current magnolia version, read from the jar Manifest. This will return null if classes are not inside
      * a jar.
      * @return implementation version, read from the manifest file.
      */
     public String getVersionFromManifest() {
         Package p = this.getClass().getPackage();
         if (p != null) {
             return StringUtils.defaultString(p.getImplementationVersion());
         }
         return StringUtils.EMPTY;
     }
 
     /**
      * Load meta element.
      */
     private void load(Document document) {
         Element metaElement = document.getRootElement().getChild(ELEMENT_META);
 
         @SuppressWarnings("unchecked")
         List<Element> elements = metaElement.getChildren();
 
         values = new HashMap<String,String>(10);
         Iterator<Element> iterator = elements.iterator();
         while (iterator.hasNext()) {
             Element element = iterator.next();
             values.put(element.getName(), element.getText());
         }
 
         String osName = System.getProperty("os.name");
         values.put(OS_NAME, osName.replaceAll(" ", "-"));
 
         values.put(IMPLEMENTATION_VERSION, getVersionFromManifest());
 
     }
 
     /**
      * Print version info to System.out.
      */
     public void printVersionInfo() {
         System.out.println("---------------------------------------------");
         System.out.println("MAGNOLIA LICENSE");
         System.out.println("---------------------------------------------");
         System.out.println("Version number : " + get(LicenseFileExtractor.VERSION_NUMBER));
         System.out.println("Build          : " + get(LicenseFileExtractor.BUILD_NUMBER));
         System.out.println("Edition        : " + get(LicenseFileExtractor.EDITION));
         System.out.println("Provider       : " + get(LicenseFileExtractor.PROVIDER) + " (" + get(LicenseFileExtractor.PROVIDER_EMAIL) + ")");
     }
 }