/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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.opencastproject.oaipmh.matterhorn;
  
  import static org.opencastproject.util.UrlSupport.uri;
  import static org.opencastproject.util.UrlSupport.url;
  
  import org.opencastproject.oaipmh.persistence.SearchResultElementItem;
  import org.opencastproject.oaipmh.persistence.SearchResultItem;
  import org.opencastproject.oaipmh.server.MetadataFormat;
  import org.opencastproject.oaipmh.server.MetadataProvider;
  import org.opencastproject.oaipmh.server.OaiPmhRepository;
  import org.opencastproject.oaipmh.util.XmlGen;
  import org.opencastproject.util.XmlUtil;
  import org.opencastproject.util.data.Collections;
  
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  
  import java.net.URI;
  import java.net.URL;
  import java.util.List;
  import java.util.Optional;
  
  /**
   * The matterhorn-inlined metadata provider provides whole media packages, series and episode DublinCores and series ACLs.
   */
  public class MatterhornInlinedMetadataProvider implements MetadataProvider {
    private static final URL SCHEMA_URL = url("http://www.opencastproject.org/oai/matterhorn-inlined.xsd");
    private static final URI NAMESPACE_URI = uri("http://www.opencastproject.org/oai/matterhorn-inlined");
  
    private static final MetadataFormat METADATA_FORMAT = new MetadataFormat() {
      @Override
      public String getPrefix() {
        return "matterhorn-inlined";
      }
  
      @Override
      public URL getSchema() {
        return SCHEMA_URL;
      }
  
      @Override
      public URI getNamespace() {
        return NAMESPACE_URI;
      }
    };
  
    private static final Optional<String> NS_URI = Optional.of(NAMESPACE_URI.toString());
  
    @Override
    public MetadataFormat getMetadataFormat() {
      return METADATA_FORMAT;
    }
  
    @Override
    public Element createMetadata(OaiPmhRepository repository, final SearchResultItem item, Optional<String> set) {
      XmlGen xml = new XmlGen(Optional.<String>empty()) {
        @Override
        public Element create() {
          List<Node> inlinedNodes = Collections.list(parse(Optional.ofNullable(item.getMediaPackageXml())));
          for (SearchResultElementItem elementItem : item.getElements()) {
            inlinedNodes.add($e(elementItem.getType(), NS_URI,
                    $a("type", elementItem.getFlavor()),
                    parse(Optional.ofNullable(elementItem.getXml()))));
          }
          return $e("inlined", NS_URI, inlinedNodes);
        }
  
        private Node parse(Optional<String> xml) {
          if (xml.isPresent()) {
            for (final Document d : XmlUtil.parseNs(xml.get()).right()) {
              return d.getDocumentElement();
            }
          }
          return nodeZero();
        }
      };
      return xml.create();
    }
 
 }