/*
    * 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.IOException;
  import java.io.InputStream;
  import java.util.Iterator;
  import java.util.Map;
  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.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * 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) {
          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);
                  loadDefaultContent(domain, contentJSON);
              } catch (Exception e) {
                  LOG.error("[{}] While loading default Keymaster content", domain, e);
              }
          }
      }
  
      protected void loadDefaultContent(final String domain, final InputStream contentJSON)
              throws IOException {
  
          try (contentJSON) {
              JsonNode content = MAPPER.readTree(contentJSON);
              for (Iterator<Map.Entry<String, JsonNode>> itor = content.fields(); itor.hasNext();) {
                  Map.Entry<String, JsonNode> param = itor.next();
                  Object value = MAPPER.treeToValue(param.getValue(), Object.class);
                  if (value != null) {
                      confParamOps.set(domain, param.getKey(), value);
                  }
              }
          }
      }
  }