/*
    * Copyright 2012-2021 CodeLibs Project and the Others.
    *
    * Licensed 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.codelibs.fess.dict;
  
  import java.io.File;
  import java.io.IOException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  
  import javax.annotation.PostConstruct;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.codelibs.core.io.FileUtil;
  import org.codelibs.curl.CurlResponse;
  import org.codelibs.fesen.runner.net.FesenCurl;
  import org.codelibs.fess.Constants;
  import org.codelibs.fess.util.ComponentUtil;
  import org.dbflute.optional.OptionalEntity;
  
  public class DictionaryManager {
      private static final Logger logger = LogManager.getLogger(DictionaryManager.class);
  
      protected List<DictionaryCreator> creatorList = new ArrayList<>();
  
      @PostConstruct
      public void init() {
          if (logger.isDebugEnabled()) {
              logger.debug("Initialize {}", this.getClass().getSimpleName());
          }
          creatorList.forEach(creator -> {
              creator.setDictionaryManager(this);
          });
      }
  
      public DictionaryFile<? extends DictionaryItem>[] getDictionaryFiles() {
          try (CurlResponse response = ComponentUtil.getCurlHelper().get("/_configsync/file").param("fields", "path,@timestamp")
                  .param("size", ComponentUtil.getFessConfig().getPageDictionaryMaxFetchSize()).execute()) {
              final Map<String, Object> contentMap = response.getContent(FesenCurl.jsonParser());
              @SuppressWarnings("unchecked")
              final List<Map<String, Object>> fileList = (List<Map<String, Object>>) contentMap.get("file");
              return fileList.stream().map(fileMap -> {
                  try {
                      final String path = fileMap.get("path").toString();
                      final Date timestamp =
                              new SimpleDateFormat(Constants.DATE_FORMAT_ISO_8601_EXTEND_UTC).parse(fileMap.get("@timestamp").toString());
                      for (final DictionaryCreator creator : creatorList) {
                          final DictionaryFile<? extends DictionaryItem> file = creator.create(path, timestamp);
                          if (file != null) {
                              return file;
                          }
                      }
                  } catch (final Exception e) {
                      logger.warn("Failed to load {}", fileMap, e);
                  }
                  return null;
              }).filter(file -> file != null).toArray(n -> new DictionaryFile<?>[n]);
          } catch (final IOException e) {
              throw new DictionaryException("Failed to access dictionaries", e);
          }
      }
  
      public OptionalEntity<DictionaryFile<? extends DictionaryItem>> getDictionaryFile(final String id) {
          for (final DictionaryFile<? extends DictionaryItem> dictFile : getDictionaryFiles()) {
              if (dictFile.getId().equals(id)) {
                  return OptionalEntity.of(dictFile);
              }
          }
          return OptionalEntity.empty();
      }
  
      public void store(final DictionaryFile<? extends DictionaryItem> dictFile, final File file) {
          getDictionaryFile(dictFile.getId()).ifPresent(currentFile -> {
              if (currentFile.getTimestamp().getTime() > dictFile.getTimestamp().getTime()) {
                  throw new DictionaryException(dictFile.getPath() + " was updated.");
              }
  
              // TODO use stream
              try (CurlResponse response = ComponentUtil.getCurlHelper().post("/_configsync/file").param("path", dictFile.getPath())
                      .body(FileUtil.readUTF8(file)).execute()) {
                  final Map<String, Object> contentMap = response.getContent(FesenCurl.jsonParser());
                  if (!Constants.TRUE.equalsIgnoreCase(contentMap.get("acknowledged").toString())) {
                      throw new DictionaryException("Failed to update " + dictFile.getPath());
                 }
             } catch (final IOException e) {
                 throw new DictionaryException("Failed to update " + dictFile.getPath(), e);
             }
 
         }).orElse(() -> {
             throw new DictionaryException(dictFile.getPath() + " does not exist.");
         });
     }
 
     public CurlResponse getContentResponse(final DictionaryFile<? extends DictionaryItem> dictFile) {
         return ComponentUtil.getCurlHelper().get("/_configsync/file").param("path", dictFile.getPath()).execute();
     }
 
     public void addCreator(final DictionaryCreator creator) {
         creatorList.add(creator);
     }
 
 }