/*
    * Portions of this software was developed by employees of the National Institute
    * of Standards and Technology (NIST), an agency of the Federal Government and is
    * being made available as a public service. Pursuant to title 17 United States
    * Code Section 105, works of NIST employees are not subject to copyright
    * protection in the United States. This software may be subject to foreign
    * copyright. Permission in the United States and in foreign countries, to the
    * extent that NIST may hold copyright, to use, copy, modify, create derivative
    * works, and distribute this software and its documentation without fee is hereby
   * granted on a non-exclusive basis, provided that this notice and disclaimer
   * of warranty appears in all copies.
   *
   * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
   * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
   * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
   * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
   * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
   * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
   * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
   * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
   * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
   * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
   * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
   */
  
  package gov.nist.secauto.metaschema.core.datatype.markup.flexmark;
  
  import com.vladsch.flexmark.parser.ListOptions;
  
  import gov.nist.secauto.metaschema.core.util.CollectionUtil;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  
  import org.codehaus.stax2.evt.XMLEventFactory2;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  import javax.xml.namespace.QName;
  import javax.xml.stream.XMLEventWriter;
  import javax.xml.stream.XMLStreamException;
  import javax.xml.stream.events.Attribute;
  import javax.xml.stream.events.EndElement;
  import javax.xml.stream.events.StartElement;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class MarkupXmlEventWriter
      extends AbstractMarkupWriter<XMLEventWriter, XMLStreamException> {
  
    @NonNull
    protected final XMLEventFactory2 eventFactory;
  
    public MarkupXmlEventWriter(
        @NonNull String namespace,
        @NonNull ListOptions listOptions,
        @NonNull XMLEventWriter writer,
        @NonNull XMLEventFactory2 eventFactory) {
      super(namespace, listOptions, writer);
      this.eventFactory = Objects.requireNonNull(eventFactory, "eventFactory");
    }
  
    @NonNull
    protected XMLEventFactory2 getEventFactory() {
      return eventFactory;
    }
  
    @NonNull
    protected List<Attribute> handleAttributes(@NonNull Map<String, String> attributes) {
      List<Attribute> attrs;
      if (attributes.isEmpty()) {
        attrs = CollectionUtil.emptyList();
      } else {
        attrs = ObjectUtils.notNull(attributes.entrySet().stream()
            .map((entry) -> eventFactory.createAttribute(entry.getKey(), entry.getValue()))
            .collect(Collectors.toList()));
      }
      return attrs;
    }
  
    @Override
    public void writeEmptyElement(QName qname, Map<String, String> attributes) throws XMLStreamException {
      List<Attribute> attrs = handleAttributes(attributes);
      StartElement start = eventFactory.createStartElement(qname, attrs.isEmpty() ? null : attrs.iterator(), null);
  
      XMLEventWriter stream = getStream();
      stream.add(start);
  
      EndElement end = eventFactory.createEndElement(qname, null);
      stream.add(end);
    }
  
    @Override
    public void writeElementStart(QName qname, Map<String, String> attributes) throws XMLStreamException {
      List<Attribute> attrs = handleAttributes(attributes);
      StartElement start = eventFactory.createStartElement(qname, attrs.isEmpty() ? null : attrs.iterator(), null);
      getStream().add(start);
   }
 
   @Override
   public void writeElementEnd(QName qname) throws XMLStreamException {
     EndElement end = eventFactory.createEndElement(qname, null);
     getStream().add(end);
   }
 
   @Override
   public void writeText(CharSequence text) throws XMLStreamException {
     getStream().add(eventFactory.createCharacters(text.toString()));
   }
 
   @Override
   protected void writeHtmlEntityInternal(String entityText) throws XMLStreamException {
     getStream().add(eventFactory.createEntityReference(entityText, null));
   }
 
   @Override
   protected void writeComment(CharSequence text) throws XMLStreamException {
     getStream().add(eventFactory.createComment(text.toString()));
   }
 }