//
   //  ========================================================================
   //  Copyright (c) 1995-2016 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.quickstart;
  
  import org.eclipse.jetty.annotations.AnnotationConfiguration;
  import org.eclipse.jetty.annotations.AnnotationDecorator;
  import org.eclipse.jetty.annotations.ServletContainerInitializersStarter;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  import org.eclipse.jetty.util.resource.Resource;
  import org.eclipse.jetty.webapp.StandardDescriptorProcessor;
  import org.eclipse.jetty.webapp.WebAppClassLoader;
  import org.eclipse.jetty.webapp.WebAppContext;
  import org.eclipse.jetty.webapp.WebInfConfiguration;
  
  /**
   * QuickStartConfiguration
   * <p> 
   * Re-inflate a deployable webapp from a saved effective-web.xml
   * which combines all pre-parsed web xml descriptors and annotations.
   */
  public class QuickStartConfiguration extends WebInfConfiguration
  {
      private static final Logger LOG = Log.getLogger(QuickStartConfiguration.class);
  
      /**
       * @see org.eclipse.jetty.webapp.AbstractConfiguration#preConfigure(org.eclipse.jetty.webapp.WebAppContext)
       */
      @Override
      public void preConfigure(WebAppContext context) throws Exception
      {
          //check that webapp is suitable for quick start - it is not a packed war
          String war = context.getWar();
          if (war == null || war.length()<=0)
              throw new IllegalStateException ("No location for webapp");  
          
          //Make a temp directory for the webapp if one is not already set
          resolveTempDirectory(context);
  
          Resource webApp = context.newResource(war);
  
          // Accept aliases for WAR files
          if (webApp.isAlias())
          {
              LOG.debug(webApp + " anti-aliased to " + webApp.getAlias());
              webApp = context.newResource(webApp.getAlias());
          }
  
          // Is the WAR usable directly?
          if (!webApp.exists() || !webApp.isDirectory() || webApp.toString().startsWith("jar:"))
              throw new IllegalStateException("Webapp does not exist or is not unpacked");
          
          context.setBaseResource(webApp);
  
          LOG.debug("webapp={}",webApp);
  
          
          //look for quickstart-web.xml in WEB-INF of webapp
          Resource quickStartWebXml = getQuickStartWebXml(context);
          LOG.debug("quickStartWebXml={}",quickStartWebXml);
          
          context.getMetaData().setWebXml(quickStartWebXml);
      }
  
      
      /**
       * Get the quickstart-web.xml file as a Resource.
       * 
       * @param context the web app context
       * @return the Resource for the quickstart-web.xml
       * @throws Exception if unable to find the quickstart xml
       */
      public Resource getQuickStartWebXml (WebAppContext context) throws Exception
      {
          Resource webInf = context.getWebInf();
          if (webInf == null || !webInf.exists())
              throw new IllegalStateException("No WEB-INF");
          LOG.debug("webinf={}",webInf);
    
          Resource quickStartWebXml = webInf.addPath("quickstart-web.xml");
          if (!quickStartWebXml.exists())
              throw new IllegalStateException ("No WEB-INF/quickstart-web.xml");
          return quickStartWebXml;
     }
     
     
     
     /**
      * @see org.eclipse.jetty.webapp.AbstractConfiguration#configure(org.eclipse.jetty.webapp.WebAppContext)
      */
     @Override
     public void configure(WebAppContext context) throws Exception
     {
         LOG.debug("configure {}",this);
         if (context.isStarted())
         {
             LOG.warn("Cannot configure webapp after it is started");
             return;
         }
         
         //Temporary:  set up the classpath here. This should be handled by the QuickStartDescriptorProcessor
         Resource webInf = context.getWebInf();
 
         if (webInf != null && webInf.isDirectory() && context.getClassLoader() instanceof WebAppClassLoader)
         {
             // Look for classes directory
             Resource classes= webInf.addPath("classes/");
             if (classes.exists())
                 ((WebAppClassLoader)context.getClassLoader()).addClassPath(classes);
 
             // Look for jars
             Resource lib= webInf.addPath("lib/");
             if (lib.exists() || lib.isDirectory())
                 ((WebAppClassLoader)context.getClassLoader()).addJars(lib);
         }
 
         //add the processor to handle normal web.xml content
         context.getMetaData().addDescriptorProcessor(new StandardDescriptorProcessor());
         
         //add a processor to handle extended web.xml format
         context.getMetaData().addDescriptorProcessor(new QuickStartDescriptorProcessor());
         
         //add a decorator that will find introspectable annotations
         context.getObjectFactory().addDecorator(new AnnotationDecorator(context)); //this must be the last Decorator because they are run in reverse order!
         
         //add a context bean that will run ServletContainerInitializers as the context starts
         ServletContainerInitializersStarter starter = (ServletContainerInitializersStarter)context.getAttribute(AnnotationConfiguration.CONTAINER_INITIALIZER_STARTER);
         if (starter != null)
             throw new IllegalStateException("ServletContainerInitializersStarter already exists");
         starter = new ServletContainerInitializersStarter(context);
         context.setAttribute(AnnotationConfiguration.CONTAINER_INITIALIZER_STARTER, starter);
         context.addBean(starter, true);       
 
         LOG.debug("configured {}",this);
     }
 
 }