/*
    * 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.persistence.jpa.content;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.json.JsonMapper;
  import java.io.InputStream;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.Callable;
  import javax.sql.DataSource;
  import org.apache.syncope.common.keymaster.client.api.ConfParamOps;
  import org.apache.syncope.core.persistence.api.content.ConfParamLoader;
  import org.apache.syncope.core.spring.ApplicationContextProvider;
  import org.apache.syncope.core.spring.security.AuthContextUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.transaction.annotation.Transactional;
  
  /**
   * Initialize Keymaster with default content if no data is present already.
   */
  public class KeymasterConfParamLoader implements ConfParamLoader {
  
      protected static final Logger LOG = LoggerFactory.getLogger(KeymasterConfParamLoader.class);
  
      protected static final JsonMapper MAPPER = JsonMapper.builder().findAndAddModules().build();
  
      protected final ConfParamOps confParamOps;
  
      public KeymasterConfParamLoader(final ConfParamOps confParamOps) {
          this.confParamOps = confParamOps;
      }
  
      @Override
      public int getOrder() {
          return 450;
      }
  
      @Override
      public void load(final String domain, final DataSource datasource) {
          AuthContextUtils.callAsAdmin(domain, new Callable<Void>() {
  
              @Transactional
              @Override
              public Void call() throws Exception {
                  boolean existingData;
                  try {
                      existingData = !confParamOps.list(domain).isEmpty();
                  } catch (Exception e) {
                      LOG.error("[{}] Could not access Keymaster", domain, e);
                      existingData = true;
                  }
  
                  if (existingData) {
                      LOG.info("[{}] Data found in Keymaster, leaving untouched", domain);
                  } else {
                      LOG.info("[{}] Empty Keymaster found, loading default content", domain);
  
                      try (InputStream contentJSON = ApplicationContextProvider.getBeanFactory().
                              getBean(domain + "KeymasterConfParamsJSON", InputStream.class)) {
  
                          JsonNode content = MAPPER.readTree(contentJSON);
                          for (Iterator<Map.Entry<String, JsonNode>> itor = content.fields(); itor.hasNext();) {
                              Map.Entry<String, JsonNode> param = itor.next();
                              Optional.ofNullable(MAPPER.treeToValue(param.getValue(), Object.class)).
                                      ifPresent(value -> confParamOps.set(domain, param.getKey(), value));
                          }
                      } catch (Exception e) {
                          LOG.error("[{}] While loading default Keymaster content", domain, e);
                      }
                  }
  
                  return null;
              }
          });
      }
  }