// ========================================================================
   // Copyright (c) 2010 Intalio, Inc.
   // ------------------------------------------------------------------------
   // 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. 
  // Contributors:
  //    Hugues Malphettes - initial API and implementation
  // ========================================================================
  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.utils.BundleFileLocatorHelper;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.util.log.Log;
  import org.osgi.framework.Bundle;
  import org.osgi.framework.BundleContext;
  
  /**
   * 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 and starts it.
   */
  public class DefaultJettyAtJettyHomeHelper {
  	
      /**
       * 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 SYS_PROP_JETTY_ETC_FILES = OSGiServerConstants.MANAGED_JETTY_XML_CONFIG_URLS;
  
      /**
       * Usual system property used as the hostname for a typical jetty configuration.
       */
      public static final String SYS_PROP_JETTY_HOME = "jetty.home";
      /**
       * System property to point to a bundle that embeds a jetty configuration
       * and that jetty configuration should be the default jetty server.
       * First we look for jetty.home. If we don't find it then we look for this property.
       */
      public static final String SYS_PROP_JETTY_HOME_BUNDLE = "jetty.home.bundle";
      /**
       * Usual system property used as the hostname for a typical jetty configuration.
       */
      public static final String SYS_PROP_JETTY_HOST = "jetty.host";
      /**
       * Usual system property used as the port for http for a typical jetty configuration.
       */
      public static final String SYS_PROP_JETTY_PORT = "jetty.port";
      /**
       * Usual system property used as the port for https for a typical jetty configuration.
       */
      public static final String SYS_PROP_JETTY_PORT_SSL = "jetty.port.ssl";
  	
      /**
       * Called by the JettyBootStrapActivator.
       * If the system property jetty.home is defined and points to a folder,
       * deploys the 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 and deploys the corresponding 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 spearate list of URLs or relative paths inside the bundle or folder
       * to the config files. If underfined it defaults to 'etc/jetty.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)
      {
      	String jettyHomeSysProp = System.getProperty(SYS_PROP_JETTY_HOME);
      	String jettyHomeBundleSysProp = System.getProperty(SYS_PROP_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 the jetty.home property and the jetty.home.bundle property are defined."
     					+ " jetty.home.bundle is not taken into account.");
     		}
     		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 started.");
     		return;
     	}
 		try
 		{
 			Server server = new Server();
 			Dictionary properties = new Hashtable();
 			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,SYS_PROP_JETTY_HOME,System.getProperty(SYS_PROP_JETTY_HOME));
 			setProperty(properties,SYS_PROP_JETTY_HOST,System.getProperty(SYS_PROP_JETTY_HOST));
 			setProperty(properties,SYS_PROP_JETTY_PORT,System.getProperty(SYS_PROP_JETTY_PORT));
 			setProperty(properties,SYS_PROP_JETTY_PORT_SSL,System.getProperty(SYS_PROP_JETTY_PORT_SSL));
 
    			bundleContext.registerService(Server.class.getName(), server, properties);
 //   			hookNestedConnectorToBridgeServlet(server);
 		}
 		catch (Throwable t)
 		{
 			t.printStackTrace();
 		}
     }
     
     /**
      * 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(SYS_PROP_JETTY_ETC_FILES,"etc/jetty.xml");
         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) {
 					e.printStackTrace();
 					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 jettyetc = System.getProperty(SYS_PROP_JETTY_ETC_FILES,"etc/jetty.xml");
         StringTokenizer tokenizer = new StringTokenizer(jettyetc,";,", false);
         StringBuilder res = new StringBuilder();
         
         while (tokenizer.hasMoreTokens())
         {
             String etcFile = tokenizer.nextToken().trim();
             if (etcFile.startsWith("/") || etcFile.indexOf(":") != -1)
             {
             	appendToCommaSeparatedList(res, etcFile);
             }
             else
             {
             	Enumeration<URL> enUrls = BundleFileLocatorHelper.DEFAULT
             				.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()) && etcFile.endsWith("etc/jetty.xml"))
             	{
             		enUrls = BundleFileLocatorHelper.DEFAULT
             				.findEntries(configurationBundle, "/jettyhome/etc/jetty-osgi-default.xml");
             		System.err.println("Configuring jetty with the default embedded configuration:" +
             				"bundle: " + configurationBundle.getSymbolicName() + 
             				" config: /jettyhome/etc/jetty-osgi-default.xml");
             	}
             	if (enUrls == null || !enUrls.hasMoreElements())
             	{
             		System.err.println("Unable to locate a jetty configuration file for " + etcFile);
             	}
         		if (enUrls != null)
         		{
         			while (enUrls.hasMoreElements())
         			{
         				appendToCommaSeparatedList(res, enUrls.nextElement().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 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;
 		}
 	}
 }