/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.chemistry.opencmis.server.impl.browser;
  
  import static org.apache.chemistry.opencmis.commons.impl.Constants.PARAM_ACL;
  import static org.apache.chemistry.opencmis.commons.impl.Constants.PARAM_CHANGE_LOG_TOKEN;
  import static org.apache.chemistry.opencmis.commons.impl.Constants.PARAM_FILTER;
  import static org.apache.chemistry.opencmis.commons.impl.Constants.PARAM_POLICY_IDS;
  import static org.apache.chemistry.opencmis.commons.impl.Constants.PARAM_PROPERTIES;
  import static org.apache.chemistry.opencmis.server.shared.HttpUtils.getBigIntegerParameter;
  import static org.apache.chemistry.opencmis.server.shared.HttpUtils.getBooleanParameter;
  import static org.apache.chemistry.opencmis.server.shared.HttpUtils.getEnumParameter;
  import static org.apache.chemistry.opencmis.server.shared.HttpUtils.getStringParameter;
  
  import java.math.BigInteger;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.chemistry.opencmis.commons.data.ObjectList;
  import org.apache.chemistry.opencmis.commons.enums.IncludeRelationships;
  import org.apache.chemistry.opencmis.commons.exceptions.CmisRuntimeException;
  import org.apache.chemistry.opencmis.commons.impl.Constants;
  import org.apache.chemistry.opencmis.commons.impl.JSONConstants;
  import org.apache.chemistry.opencmis.commons.impl.JSONConverter;
  import org.apache.chemistry.opencmis.commons.impl.TypeCache;
  import org.apache.chemistry.opencmis.commons.impl.json.JSONObject;
  import org.apache.chemistry.opencmis.commons.impl.server.TypeCacheImpl;
  import org.apache.chemistry.opencmis.commons.server.CallContext;
  import org.apache.chemistry.opencmis.commons.server.CmisService;
  import org.apache.chemistry.opencmis.commons.spi.Holder;
  
  /**
   * Discovery Service operations.
   */
  public class DiscoveryService {
  
      private DiscoveryService() {
      }
  
      /**
       * query.
       */
      public static void query(CallContext context, CmisService service, String repositoryId, HttpServletRequest request,
              HttpServletResponse response) throws Exception {
          // get parameters
          String statement = getStringParameter(request, Constants.PARAM_Q);
          Boolean searchAllVersions = getBooleanParameter(request, Constants.PARAM_SEARCH_ALL_VERSIONS);
          Boolean includeAllowableActions = getBooleanParameter(request, Constants.PARAM_ALLOWABLE_ACTIONS);
          IncludeRelationships includeRelationships = getEnumParameter(request, Constants.PARAM_RELATIONSHIPS,
                  IncludeRelationships.class);
          String renditionFilter = getStringParameter(request, Constants.PARAM_RENDITION_FILTER);
          BigInteger maxItems = getBigIntegerParameter(request, Constants.PARAM_MAX_ITEMS);
          BigInteger skipCount = getBigIntegerParameter(request, Constants.PARAM_SKIP_COUNT);
  
          // execute
          ObjectList results = service.query(repositoryId, statement, searchAllVersions, includeAllowableActions,
                  includeRelationships, renditionFilter, maxItems, skipCount, null);
  
          if (results == null) {
              throw new CmisRuntimeException("Results are null!");
          }
  
          TypeCache typeCache = new TypeCacheImpl(repositoryId, service);
          JSONObject jsonResults = JSONConverter.convert(results, typeCache, true);
  
          response.setStatus(HttpServletResponse.SC_OK);
          BrowserBindingUtils.writeJSON(jsonResults, request, response);
      }
  
      /**
       * getContentChanges.
       */
      public static void getContentChanges(CallContext context, CmisService service, String repositoryId,
              HttpServletRequest request, HttpServletResponse response) throws Exception {
          // get parameters
          String changeLogToken = getStringParameter(request, PARAM_CHANGE_LOG_TOKEN);
          Boolean includeProperties = getBooleanParameter(request, PARAM_PROPERTIES);
          String filter = getStringParameter(request, PARAM_FILTER);
          Boolean includePolicyIds = getBooleanParameter(request, PARAM_POLICY_IDS);
          Boolean includeAcl = getBooleanParameter(request, PARAM_ACL);
          BigInteger maxItems = getBigIntegerParameter(request, Constants.PARAM_MAX_ITEMS);
  
         Holder<String> changeLogTokenHolder = new Holder<String>(changeLogToken);
         ObjectList changes = service.getContentChanges(repositoryId, changeLogTokenHolder, includeProperties, filter,
                 includePolicyIds, includeAcl, maxItems, null);
 
         TypeCache typeCache = new TypeCacheImpl(repositoryId, service);
         JSONObject jsonChanges = JSONConverter.convert(changes, typeCache, false);
         jsonChanges.put(JSONConstants.JSON_OBJECTLIST_CHANGE_LOG_TOKEN, changeLogTokenHolder.getValue());
 
         response.setStatus(HttpServletResponse.SC_OK);
         BrowserBindingUtils.writeJSON(jsonChanges, request, response);
     }
 }