/*
    * 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.client.ui.commons;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.json.JsonMapper;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.apache.wicket.util.io.IOUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class MIMETypesLoader implements Serializable {
  
      private static final long serialVersionUID = -1865866358622817499L;
  
      protected static final Logger LOG = LoggerFactory.getLogger(MIMETypesLoader.class);
  
      protected static final JsonMapper MAPPER = JsonMapper.builder().findAndAddModules().build();
  
      protected Map<String, String> mimeTypesMap;
  
      protected List<String> mimeTypes;
  
      public void load() {
          mimeTypesMap = new HashMap<>();
          try {
              JsonNode jsonNode = MAPPER.readTree(IOUtils.toString(getClass().getResourceAsStream("/MIMETypes.json")));
              for (JsonNode node : jsonNode) {
                  JsonNode type = node.path("name");
                  JsonNode ext = node.path("extension");
                  if (!type.isMissingNode()) {
                      mimeTypesMap.put(type.asText(), ext.isMissingNode() ? "" : ext.asText());
                  }
              }
  
              mimeTypesMap = Collections.unmodifiableMap(mimeTypesMap);
              LOG.debug("MIME types loaded: {}", mimeTypesMap);
  
              mimeTypes = new ArrayList<>(mimeTypesMap.keySet());
              Collections.sort(mimeTypes);
              mimeTypes = Collections.unmodifiableList(mimeTypes);
          } catch (Exception e) {
              LOG.error("Error reading file MIMETypes from resources", e);
          }
      }
  
      public List<String> getMimeTypes() {
          return mimeTypes;
      }
  
      public String getFileExt(final String mimeType) {
          return mimeTypesMap.get(mimeType);
      }
  }