/**
    * Copyright (C) 2003-2008 eXo Platform SAS.
    *
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Affero General Public License
    * as published by the Free Software Foundation; either version 3
    * of the License, or (at your option) any later version.
    *
    * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, see<http://www.gnu.org/licenses/>.
   */
  
  package org.exoplatform.social.service.rest;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import javax.ws.rs.GET;
  import javax.ws.rs.Path;
  import javax.ws.rs.PathParam;
  import javax.ws.rs.WebApplicationException;
  import javax.ws.rs.core.Context;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.core.Response;
  import javax.ws.rs.core.UriInfo;
  import javax.xml.bind.annotation.XmlRootElement;
  
  import org.exoplatform.application.registry.Application;
  import org.exoplatform.application.registry.ApplicationCategory;
  import org.exoplatform.application.registry.ApplicationRegistryService;
  import org.exoplatform.container.PortalContainer;
  import org.exoplatform.portal.config.model.ApplicationType;
  import org.exoplatform.services.rest.resource.ResourceContainer;
  
  
  /**
   * Provides services for the application registry gadget which shows a list of applications.
   *
   * @anchor AppsRestService
   *
   */
  @Path("social/apps")
  public class AppsRestService implements ResourceContainer {
    
    private ApplicationRegistryService _applicationRegistryService;
    /**
     * constructor
     */
    public AppsRestService() {}
    
    /**
     * Gets applications from the application registry service of the portal.
     *
     *
     * @param uriInfo The requested URI information.
     * @param format The type of a returned result.
     *
     * @anchor AppsRestService.showApps
     *
     * @return The response contains returned results.
     * 
     * @throws Exception
     * 
     * @LevelAPI Platform
     */
    @GET
    @Path("show.{format}")
    public Response showApps(@Context UriInfo uriInfo, @PathParam("format") String format) throws Exception {
      //TODO hoatle gets currentUser for filter
      MediaType mediaType = Util.getMediaType(format);
      AppList appList = showApps();
      return Util.getResponse(appList, uriInfo, mediaType, Response.Status.OK);
    }
    
    /**
     * Describes an application entity from the application registry service of the portal.
     * This class is needed as a model for converter of the rest service.
     */
    static public class App {
      private String _appId;
      private String _appName;
      /**
       * sets appId
       * @param appId application id
       */
      public void setAppId(String appId) { _appId = appId; }
      /**
       * gets appId
       * @return appId application id
       */
      public String getAppId() { return _appId; }
      /**
       * sets application name
      * @param appName application name
      */
     public void setAppName(String appName) { _appName = appName; }
     /**
      * gets application name
      * @return application name
      */
     public String getAppName() {return _appName ;}
   }
   
   /**
    * List that contains applications from application registry service of portal<br>
    * This class is needed as a model for converter of the rest service.
    */
   @XmlRootElement
   static public class AppList {
     private List<App> _apps;
     /**
      * sets application list
      * @param apps application list
      */
     public void setApps(List<App> apps) { _apps = apps; }
     /**
      * gets application list
      * @return application list
      */
     public List<App> getApps() { return _apps; }
     /**
      * adds application to application list
      * @param app application
      * @see App
      */
     public void addApp(App app) {
       if (_apps == null) {
         _apps = new ArrayList<App>();
       }
       _apps.add(app);
     }
   }
   
   /**
    * shows appList
    * @return appList application list entity
    * @see AppList
    */
   private AppList showApps() {
     AppList appList = new AppList();
     ApplicationRegistryService applicationRegistryService = getApplicationRegistryService();
     //String[] applicationTypes = {org.exoplatform.web.application.Application.EXO_PORTLET_TYPE};
     try {
       List<ApplicationCategory> applicationCategoryList = applicationRegistryService.getApplicationCategories("root");
       Iterator<ApplicationCategory> applicationCategoryItr = applicationCategoryList.iterator();
       ApplicationCategory applicationCategory;
       while (applicationCategoryItr.hasNext()) {
         applicationCategory = applicationCategoryItr.next();
         ApplicationType<org.exoplatform.portal.pom.spi.portlet.Portlet> portletType = ApplicationType.PORTLET;
         List<Application> applications = applicationRegistryService.getApplications(applicationCategory, portletType);
         Iterator<Application> applicationItr = applications.iterator();
         Application application;
         while (applicationItr.hasNext()) {
           App app = new App();
           application = applicationItr.next();
           app.setAppId(application.getId());
           app.setAppName(application.getDisplayName());
           appList.addApp(app);
         }
       }
     } catch (Exception ex) {
       throw new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR);
     }
     return appList;
   }
   
   /**
    * gets applicationRegistryService
    * @return applicationRegistryService
    * @see ApplicationRegistryService
    */
   private ApplicationRegistryService getApplicationRegistryService() {
     if (_applicationRegistryService == null) {
       PortalContainer portalContainer = PortalContainer.getInstance();
       _applicationRegistryService = (ApplicationRegistryService) portalContainer.
               getComponentInstanceOfType(ApplicationRegistryService.class);
     }
     return _applicationRegistryService;
   }
 }