/*
    * 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.logging.log4j.catalog.api.dao;
  
  import java.time.LocalDateTime;
  
  import com.fasterxml.jackson.core.JsonFactory;
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.apache.logging.log4j.catalog.api.Attribute;
  import org.apache.logging.log4j.catalog.api.CatalogReader;
  
  /**
   * Provides access to the JSON version of the catalog. This version is not modifiable.
   */
  //@Component
  public class JsonCatalogReader extends AbstractCatalogReader {
  
      private static final Logger LOGGER = LogManager.getLogger(JsonCatalogReader.class);
  
      //@Autowired
      CatalogReader catalogReader;
  
      public CatalogReader getCatalogReader() {
          return catalogReader;
      }
  
      public void setCatalogReader(CatalogReader catalogReader) {
          this.catalogReader = catalogReader;
      }
  
      //@PostConstruct
      public void init() {
          catalogData = catalogReader.read();
          for (Attribute attribute : catalogData.getAttributes()) {
              attributes.put(attribute.getName(), attribute);
          }
      }
  
      @Override
      public String readCatalog() {
          JsonFactory factory = new JsonFactory();
          factory.enable(JsonParser.Feature.ALLOW_COMMENTS);
          ObjectMapper mapper = new ObjectMapper(factory);
          try {
              return mapper.writeValueAsString(catalogData);
          } catch (JsonProcessingException ex) {
              LOGGER.error("Unable to serialze Catalog", ex);
              return null;
          }
      }
  
      @Override
      public LocalDateTime getLastUpdated() {
          return catalogReader.getLastUpdated();
      }
  }