//
   //  ========================================================================
   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.osgi.boot.internal.serverfactory;
  
  import java.io.File;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.Dictionary;
  import java.util.Enumeration;
  import java.util.Hashtable;
  import java.util.StringTokenizer;
  
  import org.eclipse.jetty.osgi.boot.JettyBootstrapActivator;
  import org.eclipse.jetty.osgi.boot.OSGiServerConstants;
  import org.eclipse.jetty.osgi.boot.internal.webapp.BundleFileLocatorHelperFactory;
  import org.eclipse.jetty.osgi.boot.utils.BundleFileLocatorHelper;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  import org.osgi.framework.Bundle;
  import org.osgi.framework.BundleContext;
  
  /**
   * DefaultJettyAtJettyHomeHelper
   * 
   * 
   * Called by the {@link JettyBootstrapActivator} during the starting of the
   * bundle. If the system property 'jetty.home' is defined and points to a
   * folder, then setup the corresponding jetty server.
   */
  public class DefaultJettyAtJettyHomeHelper
  {
      private static final Logger LOG = Log.getLogger(DefaultJettyAtJettyHomeHelper.class);
  
      /**
       * contains a comma separated list of pathes to the etc/jetty-*.xml files
       * used to configure jetty. By default the value is 'etc/jetty.xml' when the
       * path is relative the file is resolved relatively to jettyhome.
       */
      public static final String JETTY_ETC_FILES = OSGiServerConstants.MANAGED_JETTY_XML_CONFIG_URLS;
  
      /**
       * Set of config files to apply to a jetty Server instance if none are supplied by SYS_PROP_JETTY_ETC_FILES
       */
      public static final String DEFAULT_JETTY_ETC_FILES = "etc/jetty.xml,etc/jetty-selector.xml,etc/jetty-deployer.xml";
      
      /**
       * Default location within bundle of a jetty home dir.
       */
      public static final String DEFAULT_JETTYHOME = "/jettyhome";
      
      
      /* ------------------------------------------------------------ */
      /**
       * Called by the JettyBootStrapActivator. If the system property jetty.home
       * is defined and points to a folder, creates a corresponding jetty
       * server.
       * <p>
       * If the system property jetty.home.bundle is defined and points to a
       * bundle, look for the configuration of jetty inside that bundle.
       * </p>
       * <p>
       * In both cases reads the system property 'jetty.etc.config.urls' to locate
       * the configuration files for the deployed jetty. It is a comma separated
       * list of URLs or relative paths inside the bundle or folder to the config
       * files. If undefined it defaults to 'etc/jetty.xml'. In the case of the jetty.home.bundle,
       * if no etc/jetty.xml file is found in the bundle, it will look for 
       * /jettyhome/etc/jetty-osgi-default.xml
       * </p>
       * <p>
       * In both cases the system properties jetty.host, jetty.port and
       * jetty.port.ssl are passed to the configuration files that might use them
       * as part of their properties.
       * </p>
       */
      public static void startJettyAtJettyHome(BundleContext bundleContext) throws Exception
      {
          String jettyHomeSysProp = System.getProperty(OSGiServerConstants.JETTY_HOME);
          String jettyHomeBundleSysProp = System.getProperty(OSGiServerConstants.JETTY_HOME_BUNDLE);
          File jettyHome = null;
          Bundle jettyHomeBundle = null;
          if (jettyHomeSysProp != null)
          {
             jettyHomeSysProp = resolvePropertyValue(jettyHomeSysProp);
             // bug 329621
             if (jettyHomeSysProp.startsWith("\"") && jettyHomeSysProp.endsWith("\"") || (jettyHomeSysProp.startsWith("'") && jettyHomeSysProp.endsWith("'")))
             {
                 jettyHomeSysProp = jettyHomeSysProp.substring(1, jettyHomeSysProp.length() - 1);
             }
             if (jettyHomeBundleSysProp != null)
             {
                 LOG.warn("Both jetty.home and jetty.home.bundle property defined: jetty.home.bundle ignored.");
             }
             jettyHome = new File(jettyHomeSysProp);
             if (!jettyHome.exists() || !jettyHome.isDirectory())
             {
                 LOG.warn("Unable to locate the jetty.home folder " + jettyHomeSysProp);
                 return;
             }
         }
         else if (jettyHomeBundleSysProp != null)
         {
             jettyHomeBundleSysProp = resolvePropertyValue(jettyHomeBundleSysProp);
             for (Bundle b : bundleContext.getBundles())
             {
                 if (b.getSymbolicName().equals(jettyHomeBundleSysProp))
                 {
                     jettyHomeBundle = b;
                     break;
                 }
             }
             if (jettyHomeBundle == null)
             {
                 LOG.warn("Unable to find the jetty.home.bundle named " + jettyHomeSysProp);
                 return;
             }
 
         }
         if (jettyHome == null && jettyHomeBundle == null)
         {
             LOG.warn("No default jetty created.");
             return;
         }
 
         Server server = new Server();
         Dictionary<String,String> properties = new Hashtable<String,String>();
         properties.put(OSGiServerConstants.MANAGED_JETTY_SERVER_NAME, OSGiServerConstants.MANAGED_JETTY_SERVER_DEFAULT_NAME);
 
         String configURLs = jettyHome != null ? getJettyConfigurationURLs(jettyHome) : getJettyConfigurationURLs(jettyHomeBundle);
         properties.put(OSGiServerConstants.MANAGED_JETTY_XML_CONFIG_URLS, configURLs);
 
         LOG.info("Configuring the default jetty server with " + configURLs);
 
         // these properties usually are the ones passed to this type of
         // configuration.
         setProperty(properties, OSGiServerConstants.JETTY_HOME, System.getProperty(OSGiServerConstants.JETTY_HOME));
         setProperty(properties, OSGiServerConstants.JETTY_HOST, System.getProperty(OSGiServerConstants.JETTY_HOST));
         setProperty(properties, OSGiServerConstants.JETTY_PORT, System.getProperty(OSGiServerConstants.JETTY_PORT));
         setProperty(properties, OSGiServerConstants.JETTY_PORT_SSL, System.getProperty(OSGiServerConstants.JETTY_PORT_SSL));
 
         //register the Server instance as an OSGi service.
         bundleContext.registerService(Server.class.getName(), server, properties);
     }
     
     
     
     /* ------------------------------------------------------------ */
     /**
      * Minimum setup for the location of the configuration files given a
      * jettyhome folder. Reads the system property jetty.etc.config.urls and
      * look for the corresponding jetty configuration files that will be used to
      * setup the jetty server.
      * 
      * @param jettyhome
      * @return
      */
     private static String getJettyConfigurationURLs(File jettyhome)
     {
         String jettyetc = System.getProperty(JETTY_ETC_FILES, DEFAULT_JETTY_ETC_FILES);
         StringTokenizer tokenizer = new StringTokenizer(jettyetc, ";,", false);
         StringBuilder res = new StringBuilder();
         while (tokenizer.hasMoreTokens())
         {
             String next = tokenizer.nextToken().trim();
             if (!next.startsWith("/") && next.indexOf(':') == -1)
             {
                 try
                 {
                     next = new File(jettyhome, next).toURI().toURL().toString();
                 }
                 catch (MalformedURLException e)
                 {
                     LOG.warn(e);
                     continue;
                 }
             }
             appendToCommaSeparatedList(res, next);
         }
         return res.toString();
     }
     
     
     /* ------------------------------------------------------------ */
     /**
      * Minimum setup for the location of the configuration files given a
      * configuration embedded inside a bundle. Reads the system property
      * jetty.etc.config.urls and look for the corresponding jetty configuration
      * files that will be used to setup the jetty server.
      * 
      * @param jettyhome
      * @return
      */
     private static String getJettyConfigurationURLs(Bundle configurationBundle)
     {
         String files = System.getProperty(JETTY_ETC_FILES, DEFAULT_JETTY_ETC_FILES);
        
         StringTokenizer tokenizer = new StringTokenizer(files, ";,", false);
         StringBuilder res = new StringBuilder();
 
         while (tokenizer.hasMoreTokens())
         {
             String etcFile = tokenizer.nextToken().trim();
             if (etcFile.startsWith("/") || etcFile.indexOf(":") != -1)
             {
                 //file path is absolute
                 appendToCommaSeparatedList(res, etcFile);
             }
             else
             {
                 //relative file path
                 Enumeration<URL> enUrls = BundleFileLocatorHelperFactory.getFactory().getHelper().findEntries(configurationBundle, etcFile);
                       
                 // default for org.eclipse.osgi.boot where we look inside
                 // jettyhome for the default embedded configuration.
                 // default inside jettyhome. this way fragments to the bundle
                 // can define their own configuration.
                 if ((enUrls == null || !enUrls.hasMoreElements()))
                 {
                     String tmp = DEFAULT_JETTYHOME+etcFile;
                     enUrls = BundleFileLocatorHelperFactory.getFactory().getHelper().findEntries(configurationBundle, tmp);                    
                     LOG.info("Configuring jetty from bundle: "
                                        + configurationBundle.getSymbolicName()
                                        + " with "+tmp);
                 }
                 if (enUrls == null || !enUrls.hasMoreElements())
                 {
                     throw new IllegalStateException ("Unable to locate a jetty configuration file for " + etcFile);
                 }
                 if (enUrls != null)
                 {
                     while (enUrls.hasMoreElements())
                     {
                         URL url = BundleFileLocatorHelperFactory.getFactory().getHelper().getFileURL(enUrls.nextElement());
                         appendToCommaSeparatedList(res, url.toString());
                     }
                 }
             }
         }
         return res.toString();
     }
     
     
     /* ------------------------------------------------------------ */
     private static void appendToCommaSeparatedList(StringBuilder buffer, String value)
     {
         if (buffer.length() != 0)
         {
             buffer.append(",");
         }
         buffer.append(value);
     }
     
     
     /* ------------------------------------------------------------ */
     private static void setProperty(Dictionary<String,String> properties, String key, String value)
     {
         if (value != null)
         {
             properties.put(key, value);
         }
     }
     
     
     /* ------------------------------------------------------------ */
     /**
      * recursively substitute the ${sysprop} by their actual system property.
      * ${sysprop,defaultvalue} will use 'defaultvalue' as the value if no
      * sysprop is defined. Not the most efficient code but we are shooting for
      * simplicity and speed of development here.
      * 
      * @param value
      * @return
      */
     public static String resolvePropertyValue(String value)
     {
         int ind = value.indexOf("${");
         if (ind == -1) { return value; }
         int ind2 = value.indexOf('}', ind);
         if (ind2 == -1) { return value; }
         String sysprop = value.substring(ind + 2, ind2);
         String defaultValue = null;
         int comma = sysprop.indexOf(',');
         if (comma != -1 && comma + 1 != sysprop.length())
         {
             defaultValue = sysprop.substring(comma + 1);
             defaultValue = resolvePropertyValue(defaultValue);
             sysprop = sysprop.substring(0, comma);
         }
         else
         {
             defaultValue = "${" + sysprop + "}";
         }
 
         String v = System.getProperty(sysprop);
 
         String reminder = value.length() > ind2 + 1 ? value.substring(ind2 + 1) : "";
         reminder = resolvePropertyValue(reminder);
         if (v != null)
         {
             return value.substring(0, ind) + v + reminder;
         }
         else
         {
             return value.substring(0, ind) + defaultValue + reminder;
         }
     }
 }