/*
    * 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.syncope.core.flowable.support;
  
  import java.util.List;
  import java.util.stream.Collectors;
  import org.apache.syncope.core.persistence.api.dao.GroupDAO;
  import org.apache.syncope.core.persistence.api.dao.UserDAO;
  import org.flowable.idm.api.Group;
  import org.flowable.idm.engine.impl.GroupQueryImpl;
  import org.flowable.idm.engine.impl.persistence.entity.GroupEntity;
  import org.flowable.idm.engine.impl.persistence.entity.GroupEntityImpl;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.transaction.annotation.Transactional;
  
  public class SyncopeGroupQueryImpl extends GroupQueryImpl {
  
      private static final long serialVersionUID = -2595069675443343682L;
  
      @Autowired
      private UserDAO userDAO;
  
      @Autowired
      private GroupDAO groupDAO;
  
      private List<Group> result;
  
      private static Group fromSyncopeGroup(final String name) {
          GroupEntity group = new GroupEntityImpl();
          group.setId(name);
          return group;
      }
  
      private void execute() {
          if (id != null) {
              org.apache.syncope.core.persistence.api.entity.group.Group syncopeGroup = groupDAO.findByName(id);
              if (syncopeGroup == null) {
                  result = List.of();
              } else {
                  result = List.of(fromSyncopeGroup(syncopeGroup.getName()));
              }
          } else if (userId != null) {
              result = userDAO.findAllGroupNames(userDAO.findByUsername(userId)).stream().
                      map(SyncopeGroupQueryImpl::fromSyncopeGroup).
                      collect(Collectors.toList());
          }
      }
  
      @Transactional(readOnly = true)
      @Override
      public long count() {
          checkQueryOk();
  
          this.resultType = ResultType.COUNT;
          if (result == null) {
              execute();
          }
          return result.size();
      }
  
      @Transactional(readOnly = true)
      @Override
      public List<Group> list() {
          checkQueryOk();
  
          this.resultType = ResultType.LIST;
          if (result == null) {
              execute();
          }
          return result;
      }
  }