/*
    * 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.ArrayList;
  import java.util.List;
  import org.apache.syncope.core.persistence.api.dao.GroupDAO;
  import org.apache.syncope.core.persistence.api.dao.UserDAO;
  import org.apache.syncope.core.persistence.api.entity.group.Group;
  import org.apache.syncope.core.persistence.api.entity.user.UMembership;
  import org.flowable.idm.api.User;
  import org.flowable.idm.engine.impl.UserQueryImpl;
  import org.flowable.idm.engine.impl.persistence.entity.UserEntity;
  import org.flowable.idm.engine.impl.persistence.entity.UserEntityImpl;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.transaction.annotation.Transactional;
  
  public class SyncopeUserQueryImpl extends UserQueryImpl {
  
      private static final long serialVersionUID = 4403344392227706318L;
  
      @Autowired
      private UserDAO userDAO;
  
      @Autowired
      private GroupDAO groupDAO;
  
      private List<User> result;
  
      private static User fromSyncopeUser(final org.apache.syncope.core.persistence.api.entity.user.User syncopeUser) {
          UserEntity user = new UserEntityImpl();
          user.setId(syncopeUser.getUsername());
          return user;
      }
  
      private void execute() {
          if (id != null) {
              org.apache.syncope.core.persistence.api.entity.user.User user = userDAO.findByUsername(id);
              if (user == null) {
                  result = List.of();
              } else if (groupId == null || userDAO.findAllGroupNames(user).contains(groupId)) {
                  result = List.of(fromSyncopeUser(user));
              }
          } else if (groupId != null) {
              Group group = groupDAO.findByName(groupId);
              if (group == null) {
                  result = List.of();
              } else {
                  result = new ArrayList<>();
                  List<UMembership> memberships = groupDAO.findUMemberships(group);
                  memberships.stream().map(membership -> fromSyncopeUser(membership.getLeftEnd())).
                          filter(user -> (!result.contains(user))).
                          forEachOrdered(user -> result.add(user));
              }
          }
      }
  
      @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<User> list() {
          checkQueryOk();
  
          this.resultType = ResultType.LIST;
          if (result == null) {
              execute();
          }
          return result;
      }
  
  }