/*
    * 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.keymaster.internal;
  
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.json.JsonMapper;
  import java.util.Map;
  import java.util.Optional;
  import java.util.TreeMap;
  import org.apache.syncope.core.persistence.api.dao.ConfParamDAO;
  import org.apache.syncope.core.persistence.api.dao.NotFoundException;
  import org.apache.syncope.core.persistence.api.entity.ConfParam;
  import org.apache.syncope.core.persistence.api.entity.SelfKeymasterEntityFactory;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.transaction.annotation.Transactional;
  
  public class InternalConfParamHelper {
  
      protected static final Logger LOG = LoggerFactory.getLogger(InternalConfParamHelper.class);
  
      protected static final JsonMapper MAPPER = JsonMapper.builder().findAndAddModules().build();
  
      protected final ConfParamDAO confParamDAO;
  
      protected final SelfKeymasterEntityFactory entityFactory;
  
      public InternalConfParamHelper(final ConfParamDAO confParamDAO, final SelfKeymasterEntityFactory entityFactory) {
          this.confParamDAO = confParamDAO;
          this.entityFactory = entityFactory;
      }
  
      @Transactional(readOnly = true)
      public Map<String, Object> list() {
          Map<String, Object> params = new TreeMap<>();
          confParamDAO.findAll().forEach(param -> {
              try {
                  params.put(param.getKey(), MAPPER.treeToValue(param.getValue(), Object.class));
              } catch (JsonProcessingException e) {
                  LOG.error("While processing {}'s value", param.getKey(), e);
              }
          });
          return params;
      }
  
      @Transactional(readOnly = true)
      public JsonNode get(final String key) {
          ConfParam param = confParamDAO.find(key);
  
          return Optional.ofNullable(param).map(ConfParam::getValue).orElse(null);
      }
  
      @Transactional
      public void set(final String key, final JsonNode value) {
          if (value == null) {
              throw new NotFoundException("No value provided for " + key);
          }
  
          ConfParam param = confParamDAO.find(key);
          if (param == null) {
              param = entityFactory.newConfParam();
              param.setKey(key);
          }
          param.setValue(value);
          confParamDAO.save(param);
      }
  
      @Transactional
      public void remove(final String key) {
          confParamDAO.delete(key);
      }
  }