/*
    * 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.logic;
  
  import java.lang.reflect.Method;
  import java.util.List;
  import java.util.stream.Collectors;
  import org.apache.commons.lang3.RandomUtils;
  import org.apache.syncope.common.keymaster.client.api.model.NetworkService;
  import org.apache.syncope.common.lib.to.EntityTO;
  import org.apache.syncope.core.persistence.api.dao.NetworkServiceDAO;
  import org.apache.syncope.core.persistence.api.dao.NotFoundException;
  import org.apache.syncope.core.persistence.api.entity.NetworkServiceEntity;
  import org.apache.syncope.core.persistence.api.entity.SelfKeymasterEntityFactory;
  import org.springframework.security.access.prepost.PreAuthorize;
  import org.springframework.transaction.annotation.Transactional;
  
  public class NetworkServiceLogic extends AbstractTransactionalLogic<EntityTO> {
  
      protected final NetworkServiceDAO serviceDAO;
  
      protected final SelfKeymasterEntityFactory entityFactory;
  
      public NetworkServiceLogic(final NetworkServiceDAO serviceDAO, final SelfKeymasterEntityFactory entityFactory) {
          this.serviceDAO = serviceDAO;
          this.entityFactory = entityFactory;
      }
  
      protected NetworkService toNetworkService(
              final NetworkService.Type serviceType,
              final NetworkServiceEntity service) {
  
          NetworkService ns = new NetworkService();
          ns.setType(serviceType);
          ns.setAddress(service.getAddress());
          return ns;
      }
  
      @PreAuthorize("@environment.getProperty('keymaster.username') == authentication.name")
      @Transactional(readOnly = true)
      public List<NetworkService> list(final NetworkService.Type serviceType) {
          return serviceDAO.findAll(serviceType).stream().
                  map(service -> toNetworkService(serviceType, service)).collect(Collectors.toList());
      }
  
      @PreAuthorize("@environment.getProperty('keymaster.username') == authentication.name")
      @Transactional(readOnly = true)
      public NetworkService get(final NetworkService.Type serviceType) {
          List<NetworkService> list = list(serviceType);
          if (list.isEmpty()) {
              throw new NotFoundException("No registered services for type " + serviceType);
          }
  
          return list.size() == 1
                  ? list.get(0)
                  : list.get(RandomUtils.nextInt(0, list.size()));
      }
  
      @PreAuthorize("@environment.getProperty('keymaster.username') == authentication.name")
      public void register(final NetworkService networkService) {
          if (serviceDAO.findAll(networkService.getType()).stream().
                  noneMatch(s -> s.getAddress().equals(networkService.getAddress()))) {
  
              NetworkServiceEntity service = entityFactory.newNetworkService();
              service.setType(networkService.getType());
              service.setAddress(networkService.getAddress());
              serviceDAO.save(service);
          }
      }
  
      @PreAuthorize("@environment.getProperty('keymaster.username') == authentication.name")
      public void unregister(final NetworkService networkService) {
          serviceDAO.deleteAll(networkService);
      }
  
      @Override
      protected EntityTO resolveReference(final Method method, final Object... args) throws UnresolvedReferenceException {
          throw new UnsupportedOperationException();
      }
  }