/*
    * 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;
  
  import com.vladsch.flexmark.html.HtmlRenderer;
  import com.vladsch.flexmark.parser.Parser;
  import com.vladsch.flexmark.util.ast.Block;
  import com.vladsch.flexmark.util.ast.Document;
  import com.vladsch.flexmark.util.ast.Node;
  import com.vladsch.flexmark.util.data.DataSet;
  import com.vladsch.flexmark.util.data.MutableDataSet;
  import com.vladsch.flexmark.util.misc.Extension;
  
  import gov.nist.secauto.metaschema.core.datatype.markup.flexmark.FlexmarkConfiguration;
  import gov.nist.secauto.metaschema.core.datatype.markup.flexmark.FlexmarkFactory;
  import gov.nist.secauto.metaschema.core.datatype.markup.flexmark.SuppressPTagExtension;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.List;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class MarkupLine
      extends AbstractMarkupString<MarkupLine> {
  
    @NonNull
    private static final DataSet FLEXMARK_CONFIG = newParserOptions();
  
    @NonNull
    private static final FlexmarkFactory FLEXMARK_FACTORY = new FlexmarkFactory(FLEXMARK_CONFIG);
  
    @SuppressWarnings("null")
    @NonNull
    protected static DataSet newParserOptions() {
      MutableDataSet options = new MutableDataSet();
      // disable inline HTML
      options.set(Parser.HTML_BLOCK_PARSER, false);
      // disable list processing
      options.set(Parser.LIST_BLOCK_PARSER, false);
      options.set(HtmlRenderer.SUPPRESS_HTML_BLOCKS, true);
  
      Collection<Extension> currentExtensions = Parser.EXTENSIONS.get(FlexmarkConfiguration.FLEXMARK_CONFIG);
      List<Extension> extensions = new LinkedList<>(currentExtensions);
      extensions.add(SuppressPTagExtension.create());
      Parser.EXTENSIONS.set(options, extensions);
  
      return FlexmarkConfiguration.newFlexmarkConfig(options);
    }
  
    @NonNull
    public static MarkupLine fromHtml(@NonNull String html) {
      return new MarkupLine(
          parseHtml(html, FLEXMARK_FACTORY.getFlexmarkHtmlConverter(), FLEXMARK_FACTORY.getMarkdownParser()));
    }
  
    @NonNull
    public static MarkupLine fromMarkdown(@NonNull String markdown) {
      return new MarkupLine(parseMarkdown(markdown, FLEXMARK_FACTORY.getMarkdownParser()));
    }
  
    @Override
    public FlexmarkFactory getFlexmarkFactory() {
      return FLEXMARK_FACTORY;
    }
  
    protected MarkupLine(@NonNull Document astNode) {
      super(astNode);
      Node child = astNode.getFirstChild();
      if (child instanceof Block && child.getNext() != null) {
        throw new IllegalStateException("multiple blocks not allowed");
      } // else empty markdown
    }
  
    @Override
   public MarkupLine copy() {
     // TODO: find a way to do a deep copy
     // this is a shallow copy that uses the same underlying Document object
     return new MarkupLine(getDocument());
   }
 
   @Override
   public boolean isBlock() {
     return false;
   }
 }