/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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 org.opencastproject.adminui.endpoint;
  
  import static org.opencastproject.adminui.endpoint.EndpointUtil.addRequestFiltersToQuery;
  import static org.opencastproject.adminui.endpoint.EndpointUtil.generateJSONObject;
  
  import org.opencastproject.adminui.exception.JsonCreationException;
  import org.opencastproject.index.service.resources.list.query.AclsListQuery;
  import org.opencastproject.index.service.resources.list.query.AgentsListQuery;
  import org.opencastproject.index.service.resources.list.query.EventListQuery;
  import org.opencastproject.index.service.resources.list.query.GroupsListQuery;
  import org.opencastproject.index.service.resources.list.query.JobsListQuery;
  import org.opencastproject.index.service.resources.list.query.SeriesListQuery;
  import org.opencastproject.index.service.resources.list.query.ServersListQuery;
  import org.opencastproject.index.service.resources.list.query.ServicesListQuery;
  import org.opencastproject.index.service.resources.list.query.ThemesListQuery;
  import org.opencastproject.index.service.resources.list.query.UsersListQuery;
  import org.opencastproject.index.service.util.JSONUtils;
  import org.opencastproject.index.service.util.RestUtils;
  import org.opencastproject.list.api.ListProviderException;
  import org.opencastproject.list.api.ListProvidersService;
  import org.opencastproject.list.api.ResourceListQuery;
  import org.opencastproject.list.impl.ListProviderNotFoundException;
  import org.opencastproject.list.impl.ResourceListQueryImpl;
  import org.opencastproject.security.api.SecurityService;
  import org.opencastproject.util.doc.rest.RestParameter;
  import org.opencastproject.util.doc.rest.RestQuery;
  import org.opencastproject.util.doc.rest.RestResponse;
  import org.opencastproject.util.doc.rest.RestService;
  
  import org.apache.commons.lang3.StringUtils;
  import org.json.simple.JSONArray;
  import org.json.simple.JSONObject;
  import org.osgi.framework.BundleContext;
  import org.osgi.service.component.annotations.Component;
  import org.osgi.service.component.annotations.Reference;
  import org.osgi.service.jaxrs.whiteboard.propertytypes.JaxrsResource;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  
  import javax.servlet.http.HttpServletResponse;
  import javax.ws.rs.GET;
  import javax.ws.rs.Path;
  import javax.ws.rs.PathParam;
  import javax.ws.rs.Produces;
  import javax.ws.rs.QueryParam;
  import javax.ws.rs.core.Context;
  import javax.ws.rs.core.HttpHeaders;
  import javax.ws.rs.core.MediaType;
  import javax.ws.rs.core.Response;
  
  @Path("/admin-ng/resources")
  @RestService(name = "ResourceListsProviders", title = "Admin UI - Resources List",
    abstractText = "This service provides key-value list from different resources to use in the admin UI.",
    notes = { "This service offers access to list providers for the admin UI.",
              "<strong>Important:</strong> "
                + "<em>This service is for exclusive use by the module admin-ui. Its API might change "
                + "anytime without prior notice. Any dependencies other than the admin UI will be strictly ignored. "
                + "DO NOT use this for integration of third-party applications.<em>"})
  @Component(
          immediate = true,
          service = ListProvidersEndpoint.class,
          property = {
                  "service.description=Admin UI - Resource List Provider Endpoint",
                  "opencast.service.type=org.opencastproject.adminui.ListProvidersEndpoint",
                  "opencast.service.path=/admin-ng/resources",
          }
  )
  @JaxrsResource
  public class ListProvidersEndpoint {
  
    private static final Logger logger = LoggerFactory.getLogger(ListProvidersEndpoint.class);
  
    public static final Response UNAUTHORIZED = Response.status(Response.Status.UNAUTHORIZED).build();
    public static final Response NOT_FOUND = Response.status(Response.Status.NOT_FOUND).build();
    public static final Response SERVER_ERROR = Response.serverError().build();
    public static final Response NO_CONTENT = Response.noContent().build();
 
   private SecurityService securityService;
   private ListProvidersService listProvidersService;
   private SeriesEndpoint seriesEndpoint;
 
   /** This regex is used to reduce the users in the filter selectbox.
    * The filter is located in the top right corner in the admin ui. */
   private static final String PROP_KEY_USER_FILTER_REGEX = "org.opencastproject.adminui.filter.user.regex";
   private static final String PROP_KEY_USER_FILTER_REGEX_DEFAULT = ".*";
 
   protected void activate(BundleContext bundleContext) {
     logger.info("Activate list provider service");
     JSONUtils.setUserRegex(StringUtils.defaultIfBlank(
             bundleContext.getProperty(PROP_KEY_USER_FILTER_REGEX),
             PROP_KEY_USER_FILTER_REGEX_DEFAULT));
   }
 
   /** OSGi callback for series services. */
   @Reference
   public void setListProvidersService(ListProvidersService listProvidersService) {
     this.listProvidersService = listProvidersService;
   }
 
   /** OSGi callback for sercurity service. */
   @Reference
   public void setSecurityService(SecurityService securitySerivce) {
     this.securityService = securitySerivce;
   }
 
   /** OSGi callback for series end point. */
   @Reference
   public void setSeriesEndpoint(SeriesEndpoint seriesEndpoint) {
     this.seriesEndpoint = seriesEndpoint;
   }
 
   @GET
   @Path("{source}.json")
   @Produces(MediaType.APPLICATION_JSON)
   @RestQuery(name = "list", description = "Provides key-value list from the given source", pathParameters = { @RestParameter(name = "source", description = "The source for the key-value list", isRequired = true, type = RestParameter.Type.STRING) }, restParameters = {
           @RestParameter(description = "The maximum number of items to return per page", isRequired = false, name = "limit", type = RestParameter.Type.INTEGER),
           @RestParameter(description = "The offset", isRequired = false, name = "offset", type = RestParameter.Type.INTEGER),
           @RestParameter(description = "Filters", isRequired = false, name = "filter", type = RestParameter.Type.STRING) }, responses = { @RestResponse(description = "Returns the key-value list for the given source.", responseCode = HttpServletResponse.SC_OK) }, returnDescription = "")
   public Response getList(@PathParam("source") final String source, @QueryParam("limit") final int limit,
           @QueryParam("filter") final String filter, @QueryParam("offset") final int offset,
           @Context HttpHeaders headers) {
 
     ResourceListQueryImpl query = new ResourceListQueryImpl();
     query.setLimit(limit);
     query.setOffset(offset);
     addRequestFiltersToQuery(filter, query);
     Map<String, String> autocompleteList;
     try {
       autocompleteList = listProvidersService.getList(source, query, false);
     } catch (ListProviderNotFoundException e) {
       logger.debug("No list found for {}", source, e);
       return NOT_FOUND;
     } catch (ListProviderException e) {
       logger.error("Server error when getting list from provider {}", source, e);
       return SERVER_ERROR;
     }
 
     JSONObject jsonList;
     try {
       jsonList = generateJSONObject(autocompleteList);
     } catch (JsonCreationException e) {
       logger.error("Not able to generate resources list JSON from source {}", source, e);
       return SERVER_ERROR;
     }
 
     return Response.ok(jsonList.toString()).build();
   }
 
   @GET
   @Path("components.json")
   @Produces(MediaType.APPLICATION_JSON)
   @RestQuery(name = "components", description = "Provides a set of constants lists (right now only eventCommentReasons) for use in the admin UI",
     responses = { @RestResponse(description = "Returns a set of constants lists (right now only eventCommentReasons) for use in the admin UI",
     responseCode = HttpServletResponse.SC_OK) }, returnDescription = "")
   public Response getComponents(@Context HttpHeaders headers) {
     String[] sources = { "eventCommentReasons" };
     ResourceListQuery query = new ResourceListQueryImpl();
 
     JSONObject list = new JSONObject();
 
     for (String source : sources) {
       if (listProvidersService.hasProvider(source)) {
         JSONObject subList;
         try {
           subList = generateJSONObject(listProvidersService.getList(source, query, true));
           list.put(source, subList);
         } catch (JsonCreationException e) {
           logger.error("Not able to generate resources list JSON from source {}", source, e);
           return SERVER_ERROR;
         } catch (ListProviderException e) {
           logger.error("Not able to get list from provider {}", source, e);
           return SERVER_ERROR;
         }
       } else {
         return NOT_FOUND;
       }
     }
 
     return Response.ok(list.toString()).build();
   }
 
   @GET
   @Path("providers.json")
   @Produces(MediaType.APPLICATION_JSON)
   @RestQuery(name = "availableProviders", description = "Provides the list of the available list providers", responses = { @RestResponse(description = "Returns the availables list providers.", responseCode = HttpServletResponse.SC_OK) }, returnDescription = "")
   public Response getAvailablesProviders(@Context HttpHeaders headers) {
     JSONArray list = new JSONArray();
 
     list.add(listProvidersService.getAvailableProviders());
 
     return Response.ok(list.toString()).build();
   }
 
   @GET
   @Path("{page}/filters.json")
   @Produces(MediaType.APPLICATION_JSON)
   @RestQuery(name = "filters", description = "Provides filters for the given page", pathParameters = { @RestParameter(name = "page", description = "The page for which the filters are required", isRequired = true, type = RestParameter.Type.STRING) }, responses = { @RestResponse(description = "Returns the filters for the given page.", responseCode = HttpServletResponse.SC_OK) }, returnDescription = "")
   public Response getFilters(@PathParam("page") final String page, @Context HttpHeaders headers)
           throws ListProviderException {
 
     ResourceListQuery query;
 
     if ("series".equals(page)) {
       query = new SeriesListQuery();
     } else if ("events".equals(page)) {
       query = new EventListQuery();
     } else if ("jobs".equals(page)) {
       query = new JobsListQuery();
     } else if ("recordings".equals(page)) {
       query = new AgentsListQuery();
     } else if ("users".equals(page)) {
       query = new UsersListQuery();
     } else if ("groups".equals(page)) {
       query = new GroupsListQuery();
     } else if ("acls".equals(page)) {
       query = new AclsListQuery();
     } else if ("servers".equals(page)) {
       query = new ServersListQuery();
     } else if ("services".equals(page)) {
       query = new ServicesListQuery();
     } else if ("themes".equals(page)) {
       query = new ThemesListQuery();
     } else {
       logger.debug("No filters defined for the page {}.", page);
       return NO_CONTENT;
     }
 
     try {
       if ("events".equals(page) && seriesEndpoint.getOnlySeriesWithWriteAccessEventsFilter()) {
         Map<String, String> seriesWriteAccess = seriesEndpoint.getUserSeriesByAccess(true);
         return RestUtils.okJson(JSONUtils.filtersToJSONSeriesWriteAccess(query, listProvidersService,
                 seriesWriteAccess));
       } else {
         return RestUtils.okJson(JSONUtils.filtersToJSON(query, listProvidersService, securityService.getOrganization()));
       }
     } catch (ListProviderException e) {
       logger.error("Not able to get list of options for the filters for the page {}", page, e);
       return SERVER_ERROR;
     }
   }
 
 }