/*
    * 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.maven.plugins.pdf;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.Writer;
  import java.util.Locale;
  import java.util.Map;
  
  import org.apache.maven.doxia.document.DocumentTOC;
  import org.apache.maven.doxia.document.DocumentTOCItem;
  import org.codehaus.plexus.util.ReaderFactory;
  import org.codehaus.plexus.util.WriterFactory;
  import org.kopitubruk.util.json.IndentPadding;
  import org.kopitubruk.util.json.JSONConfig;
  import org.kopitubruk.util.json.JSONParser;
  import org.kopitubruk.util.json.JSONUtil;
  
  /**
   * Helper to save then reload TOC content (to a json file), to be able to aggregate TOCs.
   *
   * @author anthony-beurive
   * @since 1.5
   */
  class TocFileHelper {
      private static final String FILENAME = "toc.json";
  
      static void saveTOC(File workingDirectory, DocumentTOC toc, Locale locale) throws IOException {
          // FIXME: manage locales.
          JSONConfig jsonConfig = new JSONConfig();
          jsonConfig.setIndentPadding(new IndentPadding("  ", "\n"));
          jsonConfig.addReflectClass(DocumentTOC.class);
          jsonConfig.addReflectClass(DocumentTOCItem.class);
  
          try (Writer writer = WriterFactory.newWriter(getTocFile(workingDirectory), "UTF-8")) {
              JSONUtil.toJSON(toc, jsonConfig, writer);
          }
      }
  
      static Map<String, Object> loadToc(File workingDirectory) throws IOException {
          try (Reader reader = ReaderFactory.newReader(getTocFile(workingDirectory), "UTF-8")) {
              return (Map) JSONParser.parseJSON(reader);
          }
      }
  
      private static File getTocFile(File workingDirectory) {
          return new File(workingDirectory, FILENAME);
      }
  }