/*
    * 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.controller;
  
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.ws.rs.GET;
  import javax.ws.rs.POST;
  import javax.ws.rs.Path;
  import javax.ws.rs.Produces;
  import javax.ws.rs.core.Context;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.core.Response;
  import javax.ws.rs.core.Response.ResponseBuilder;
  import javax.ws.rs.core.UriBuilder;
  import javax.ws.rs.core.UriInfo;
  
  import de.smartics.properties.admin.domain.model.ApiServices;
  import de.smartics.properties.admin.domain.model.ApiServices.ServiceDescriptor;
  import de.smartics.properties.admin.domain.model.Paths;
  
  /**
   * Provides access information about the API.
   */
  @Path("")
  public class ApiResource
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * The service to configure configurations.
     */
    public static final ServiceDescriptor CONFIGURATIONS = new ServiceDescriptor(
        "configurations", ConfigurationKeysResource.class);
  
    /**
     * The service to en- and decrypt property values.
     */
    public static final ServiceDescriptor SECURITY = new ServiceDescriptor(
        "security", SecurityResource.class);
  
    /**
     * The service configure JNDI properties.
     */
    public static final ServiceDescriptor JNDI = new ServiceDescriptor("jndi",
        JndiResource.class);
  
    /**
     * The list of services provided by this API.
     */
    private static final ApiServices SERVICES;
  
    /**
     * The service to browse property descriptors.
     */
    public static final ServiceDescriptor DESCRIPTORS = new ServiceDescriptor(
        "descriptors", PropertyDescriptorsResource.class);
  
    /**
     * The service to view a selected property descriptor.
     */
    public static final ServiceDescriptor DESCRIPTOR = new ServiceDescriptor(
        "descriptor", PropertyDescriptorResource.class);;
  
    // --- members --------------------------------------------------------------
  
    /**
     * Provides access to the request to logout the user.
     */
    @Context
    private HttpServletRequest request;
  
    /**
     * Helper to construct paths.
     */
    @Context
    private UriInfo uriInfo;
  
    // ****************************** Initializer *******************************
 
   static
   {
     final List<ServiceDescriptor> services = new ArrayList<ServiceDescriptor>();
 
     services.add(DESCRIPTORS);
     services.add(CONFIGURATIONS);
     services.add(SECURITY);
     services.add(JNDI);
 
     SERVICES = new ApiServices(services);
   }
 
   // ****************************** Constructors ******************************
 
   // ****************************** Inner Classes *****************************
 
   // ********************************* Methods ********************************
 
   // --- init -----------------------------------------------------------------
 
   // --- get&set --------------------------------------------------------------
 
   // --- business -------------------------------------------------------------
 
   private Response redirect()
   {
     final String redirect = request.getParameter("redirect-to");
     if (redirect != null)
     {
       try
       {
         final URI uri = new URI(redirect);
         final ResponseBuilder builder = Response.temporaryRedirect(uri);
         final Response response = builder.build();
         return response;
       }
       catch (final URISyntaxException e)
       {
         // ok, keep default
       }
     }
     return null;
   }
 
   /**
    * Provides a list of services in HTML.
    *
    * @return a response to redirect.
    */
   @GET
   @Produces(MediaType.TEXT_HTML)
   public Response getAsHtml()
   {
     return get();
   }
 
   /**
    * Provides a list of services in XML.
    *
    * @return a response to redirect.
    */
   @GET
   @Produces({ MediaType.TEXT_XML, MediaType.APPLICATION_XML })
   public Response getAsXml()
   {
     return get();
   }
 
   private Response get()
   {
     final Response redirect = redirect();
     if (redirect != null)
     {
       return redirect;
     }
 
     final ResponseBuilder builder = Response.ok().entity(SERVICES);
     final Response response = builder.build();
     return response;
   }
 
   /**
    * Allows to logout the user.
    *
    * @return the response to render on successful logout.
    * @throws ServletException on any problem encountered while logging out the
    *           user.
    */
   @POST
   @Path(Paths.LOGOUT)
   @Produces({ MediaType.TEXT_HTML, MediaType.TEXT_XML,
              MediaType.APPLICATION_XML })
   public Response logout() throws ServletException
   {
     if (request.getUserPrincipal() != null)
     {
       request.logout();
     }
 
     final UriBuilder builder =
         uriInfo.getBaseUriBuilder().segment("..").queryParam("logout", true);
     request.getServletPath();
     final URI homeUri = builder.build();
     final String path = request.getContextPath();
     final Response response =
         Response
             .seeOther(homeUri)
             .header(
                 "Set-Cookie",
                 "JSESSIONID=deleted; path=" + path
                     + "; expires=Thu, 01 Jan 1970 00:00:00 GMT").build();
 
     return response;
   }
 
   // --- object basics --------------------------------------------------------
 
 }