/*
    * 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.ast.Code;
  import com.vladsch.flexmark.ast.Text;
  import com.vladsch.flexmark.html.HtmlRenderer;
  import com.vladsch.flexmark.html.HtmlRendererOptions;
  import com.vladsch.flexmark.html.HtmlWriter;
  import com.vladsch.flexmark.html.renderer.NodeRenderer;
  import com.vladsch.flexmark.html.renderer.NodeRendererContext;
  import com.vladsch.flexmark.html.renderer.NodeRendererFactory;
  import com.vladsch.flexmark.html.renderer.NodeRenderingHandler;
  import com.vladsch.flexmark.parser.Parser;
  import com.vladsch.flexmark.util.ast.Node;
  import com.vladsch.flexmark.util.data.DataHolder;
  import com.vladsch.flexmark.util.data.MutableDataHolder;
  import com.vladsch.flexmark.util.sequence.Escaping;
  import com.vladsch.flexmark.util.sequence.Range;
  import com.vladsch.flexmark.util.sequence.SequenceUtils;
  
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  
  import java.util.Collections;
  import java.util.Set;
  import java.util.regex.Pattern;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  
  public class HtmlCodeRenderExtension
      implements HtmlRenderer.HtmlRendererExtension {
    private static final Pattern EOL_PATTERN = Pattern.compile("\r\n|\r|\n");
  
    public static HtmlCodeRenderExtension create() {
      return new HtmlCodeRenderExtension();
    }
  
    @Override
    public void rendererOptions(MutableDataHolder options) {
      // do nothing
    }
  
    @Override
    public void extend(HtmlRenderer.Builder rendererBuilder, String rendererType) {
      rendererBuilder.nodeRendererFactory(new CodeNodeHtmlRenderer.Factory());
    }
  
    static final class CodeNodeHtmlRenderer implements NodeRenderer {
      private final boolean codeSoftLineBreaks;
  
      private CodeNodeHtmlRenderer(DataHolder options) {
        codeSoftLineBreaks = Parser.CODE_SOFT_LINE_BREAKS.get(options);
      }
  
      @Override
      public @Nullable Set<NodeRenderingHandler<?>> getNodeRenderingHandlers() {
        return Collections.singleton(
            new NodeRenderingHandler<>(Code.class, this::render));
      }
  
      @SuppressFBWarnings(value = "RV_RETURN_VALUE_IGNORED_NO_SIDE_EFFECT", justification = "false positive")
      private void render( // NOPMD actually used in lambda
          @NonNull Code node,
          @NonNull NodeRendererContext context,
          @NonNull HtmlWriter html) {
        HtmlRendererOptions htmlOptions = context.getHtmlOptions();
  
        boolean customTag = htmlOptions.codeStyleHtmlOpen != null || htmlOptions.codeStyleHtmlClose != null;
        if (customTag) {
          html.raw(ObjectUtils.notNull(htmlOptions.codeStyleHtmlOpen));
        } else {
          if (context.getHtmlOptions().sourcePositionParagraphLines) {
            html.withAttr().tag("code");
         } else {
           html.srcPos(node.getText()).withAttr().tag("code");
         }
       }
 
       if (codeSoftLineBreaks && !htmlOptions.isSoftBreakAllSpaces) {
         for (Node child : node.getChildren()) {
           if (child instanceof Text) {
             html.text(Escaping.collapseWhitespace(child.getChars(), false));
           } else {
             context.render(child);
           }
         }
       } else {
         String text = EOL_PATTERN.matcher(node.getText()).replaceAll(" ");
         if (!text.isBlank() && SequenceUtils.startsWithWhitespace(text) && SequenceUtils.endsWithWhitespace(text)) {
           html.text(SequenceUtils.subSequence(text, Range.of(1, text.length() - 1)));
         } else {
           html.raw(Escaping.escapeHtml(text, false));
         }
         // html.text(Escaping.collapseWhitespace(node.getText(), true));
       }
 
       if (customTag) {
         html.raw(ObjectUtils.notNull(htmlOptions.codeStyleHtmlClose));
       } else {
         html.tag("/code");
       }
     }
 
     public static class Factory implements NodeRendererFactory {
 
       @Override
       public NodeRenderer apply(DataHolder options) {
         return new CodeNodeHtmlRenderer(options);
       }
 
     }
   }
 }