/*
    * 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.audit;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import java.io.Serializable;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.Layout;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.appender.AbstractAppender;
  import org.apache.logging.log4j.core.config.Property;
  import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
  import org.apache.syncope.core.provisioning.api.serialization.POJOHelper;
  import org.apache.syncope.ext.opensearch.client.OpenSearchIndexManager;
  
  public class OpenSearchAppender extends AbstractAppender {
  
      public static class Builder extends AbstractAppender.Builder<Builder>
              implements org.apache.logging.log4j.core.util.Builder<OpenSearchAppender> {
  
          private OpenSearchIndexManager openSearchIndexManager;
  
          private String domain;
  
          public OpenSearchAppender.Builder setDomain(final String domain) {
              this.domain = domain;
              return this;
          }
  
          public OpenSearchAppender.Builder setIndexManager(
                  final OpenSearchIndexManager openSearchIndexManager) {
  
              this.openSearchIndexManager = openSearchIndexManager;
              return this;
          }
  
          @Override
          public OpenSearchAppender build() {
              if (domain == null || openSearchIndexManager == null) {
                  LOGGER.error("Cannot create OpenSearchAppender without Domain or IndexManager.");
                  return null;
              }
              return new OpenSearchAppender(
                      getName(), getFilter(), getLayout(), isIgnoreExceptions(), domain, openSearchIndexManager);
          }
      }
  
      @PluginBuilderFactory
      public static Builder newBuilder() {
          return new Builder();
      }
  
      private final String domain;
  
      protected final OpenSearchIndexManager openSearchIndexManager;
  
      protected OpenSearchAppender(
              final String name,
              final Filter filter,
              final Layout<? extends Serializable> layout,
              final boolean ignoreExceptions,
              final String domain,
              final OpenSearchIndexManager openSearchIndexManager) {
  
          super(name, filter, layout, ignoreExceptions, Property.EMPTY_ARRAY);
          this.domain = domain;
          this.openSearchIndexManager = openSearchIndexManager;
      }
  
      @Override
      public void append(final LogEvent event) {
          try {
              openSearchIndexManager.audit(
                      domain,
                      event.getTimeMillis(),
                      POJOHelper.deserialize(event.getMessage().getFormattedMessage(), JsonNode.class));
          } catch (Exception e) {
              LOGGER.error("While requesting to index event for appender [{}]", getName(), e);
          }
      }
  }