/*
    * Copyright 2013 smartics, Kronseder & Reiner GmbH
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package de.smartics.properties.admin.resources.representation.xml;
  
  import java.io.OutputStream;
  import java.io.PrintStream;
  import java.io.UnsupportedEncodingException;
  import java.util.List;
  
  import org.apache.commons.lang3.StringEscapeUtils;
  
  import de.smartics.properties.admin.domain.model.ApiServices;
  import de.smartics.properties.admin.domain.model.ApiServices.ServiceDescriptor;
  import de.smartics.properties.admin.domain.model.AppRelations;
  import de.smartics.properties.admin.resources.controller.ApiResource;
  import de.smartics.properties.admin.resources.representation.share.BreadcrumbHelper;
  import de.smartics.properties.admin.resources.representation.xml.share.AbstractXmlRepresentationRenderer;
  import de.smartics.resteasy.hypermedia.renderer.LinkDescriptor;
  import de.smartics.resteasy.hypermedia.renderer.LinkDescriptorJaxrs;
  import de.smartics.resteasy.hypermedia.renderer.LinkMetadata;
  import de.smartics.resteasy.hypermedia.renderer.ResourceContext;
  
  /**
   * Displays the list of services in an XML page.
   */
  public final class ApiServicesXmlRepresentationRenderer extends
      AbstractXmlRepresentationRenderer<ApiServices>
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    // --- members --------------------------------------------------------------
  
    /**
     * The domain object to render.
     */
    private final ApiServices domainObject;
  
    // ****************************** Initializer *******************************
  
    // ****************************** Constructors ******************************
  
    /**
     * Default constructor.
     *
     * @param context the context information to render the representation.
     * @param domainObject the domain object to render.
     * @param entityStream the stream to write to.
     */
    public ApiServicesXmlRepresentationRenderer(final ResourceContext context,
        final ApiServices domainObject, final OutputStream entityStream)
    {
      super(context, entityStream);
      this.domainObject = domainObject;
    }
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- init -----------------------------------------------------------------
  
    // --- get&set --------------------------------------------------------------
  
    // --- business -------------------------------------------------------------
  
    @Override
    protected void httpBody() throws IllegalStateException
    {
      final String encoding = context.getResponse().getCharacterEncoding();
      try
      {
        final PrintStream output = new PrintStream(entityStream, true, encoding);
        output.append("<?xml version=\"1.0\" encoding=\"").append(encoding)
            .append("\"?>\n\n");
  
        output.append("<services>\n");
        for (final ServiceDescriptor service : domainObject.getServices())
        {
          if (service == ApiResource.SECURITY || service == ApiResource.JNDI)
          {
            continue;
          }
          final String id = service.getId();
          output.append("  <service id=\"")
             .append(StringEscapeUtils.escapeXml(id)).append("\">\n");
       }
       output.append("</services>\n");
     }
     catch (final UnsupportedEncodingException e)
     {
       throw new IllegalStateException(
           "Cannot write services to XML file due to unsupported encoding '"
               + encoding + "'.", e);
     }
   }
 
   @Override
   protected List<LinkDescriptor> hyperLinks()
   {
     final List<LinkDescriptor> links =
         BreadcrumbHelper.adjustSelf(breadcrumb.api());
 
     for (final ServiceDescriptor service : domainObject.getServices())
     {
       if (service == ApiResource.SECURITY || service == ApiResource.JNDI)
       {
         continue;
       }
 
       final LinkDescriptor link = createLink(service);
       links.add(link);
     }
 
     return links;
   }
 
   private LinkDescriptor createLink(final ServiceDescriptor service)
   {
     final LinkDescriptor link =
         linkDescriptorFactory.createDescriptor(service, "getAsXml");
     link.addRels(getRelByService(service), service.getId());
 
     final LinkMetadata metadata = new LinkMetadata();
 
     final LinkDescriptorJaxrs descriptor =
         new LinkDescriptorJaxrs(link, metadata);
     return descriptor;
   }
 
   private String getRelByService(final ServiceDescriptor service)
   {
     if (service == ApiResource.CONFIGURATIONS)
     {
       return AppRelations.CONFIGURATIONS;
     }
     else if (service == ApiResource.DESCRIPTORS)
     {
       return AppRelations.DESCRIPTORS;
     }
 
     return AppRelations.API_HOME;
   }
 
   @Override
   protected void close()
   {
   }
 
   // --- object basics --------------------------------------------------------
 
 }