///////////////////////////////////////////////////////////////////////////////////////////////
   // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
   // Copyright (C) 2001-2025 the original author or authors.
   //
   // This library is free software; you can redistribute it and/or
   // modify it under the terms of the GNU Lesser General Public
   // License as published by the Free Software Foundation; either
   // version 2.1 of the License, or (at your option) any later version.
   //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.site;
  
  import java.nio.file.Path;
  import java.util.Locale;
  
  import org.apache.maven.doxia.macro.AbstractMacro;
  import org.apache.maven.doxia.macro.Macro;
  import org.apache.maven.doxia.macro.MacroExecutionException;
  import org.apache.maven.doxia.macro.MacroRequest;
  import org.apache.maven.doxia.module.xdoc.XdocSink;
  import org.apache.maven.doxia.sink.Sink;
  import org.codehaus.plexus.component.annotations.Component;
  
  /**
   * A macro that inserts a link to the parent module.
   */
  @Component(role = Macro.class, hint = "parent-module")
  public class ParentModuleMacro extends AbstractMacro {
      @Override
      public void execute(Sink sink, MacroRequest request) throws MacroExecutionException {
          // until https://github.com/checkstyle/checkstyle/issues/13426
          if (!(sink instanceof XdocSink)) {
              throw new MacroExecutionException("Expected Sink to be an XdocSink.");
          }
          final String moduleName = (String) request.getParameter("moduleName");
          final Object instance = SiteUtil.getModuleInstance(moduleName);
          final Class<?> clss = instance.getClass();
          createParentModuleParagraph((XdocSink) sink, clss, moduleName);
      }
  
      /**
       * Creates a paragraph with a link to the parent module.
       *
       * @param sink the sink to write to.
       * @param clss the class of the module.
       * @param moduleName the module name.
       * @throws MacroExecutionException if the parent module cannot be found.
       */
      private static void createParentModuleParagraph(XdocSink sink, Class<?> clss, String moduleName)
              throws MacroExecutionException {
          final String parentModule = SiteUtil.getParentModule(clss);
          final String linkToParentModule = getLinkToParentModule(parentModule, moduleName);
  
          sink.setInsertNewline(false);
          sink.paragraph();
          sink.setInsertNewline(true);
          final String indentLevel10 = SiteUtil.getNewlineAndIndentSpaces(10);
          sink.rawText(indentLevel10);
          sink.link(linkToParentModule);
          sink.text(parentModule);
          sink.link_();
          final String indentLevel8 = SiteUtil.getNewlineAndIndentSpaces(8);
          sink.rawText(indentLevel8);
          sink.paragraph_();
      }
  
      /**
       * Returns relative link to the parent module for the given module class.
       *
       * @param parentModule parent module name.
       * @param moduleName the module name we are looking for the parent of.
       * @return relative link to the parent module.
       * @throws MacroExecutionException if link to the parent module cannot be constructed.
       */
      private static String getLinkToParentModule(String parentModule, String moduleName)
              throws MacroExecutionException {
          final Path templatePath = SiteUtil.getTemplatePath(moduleName);
          if (templatePath == null) {
              throw new MacroExecutionException(
                      String.format(Locale.ROOT, "Could not find template for %s", moduleName));
          }
          final Path templatePathParent = templatePath.getParent();
          if (templatePathParent == null) {
              throw new MacroExecutionException("Failed to get parent path for " + templatePath);
          }
          return templatePathParent
                  .relativize(Path.of("src", "site/xdoc", "config.xml"))
                  .toString()
                  .replace(".xml", ".html")
                  .replace('\\', '/')
                 + "#" + parentModule;
     }
 }