///////////////////////////////////////////////////////////////////////////////////////////////
   // 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.beans.Introspector;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.regex.Pattern;
  
  import com.puppycrawl.tools.checkstyle.FileStatefulCheck;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.DetailNode;
  import com.puppycrawl.tools.checkstyle.api.JavadocTokenTypes;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.checks.javadoc.AbstractJavadocCheck;
  import com.puppycrawl.tools.checkstyle.utils.BlockCommentPosition;
  
  /**
   * Class for scraping class javadoc and all property setter javadocs from the
   * given checkstyle module.
   */
  @FileStatefulCheck
  public class ClassAndPropertiesSettersJavadocScraper extends AbstractJavadocCheck {
  
      /**
       * Map of scraped javadocs - name of property, javadoc detail node.
       * The class javadoc is stored too, with the key being the module name.
       */
      private static final Map<String, DetailNode> JAVADOC_FOR_MODULE_OR_PROPERTY =
              new LinkedHashMap<>();
  
      /** Name of the module being scraped. */
      private static String moduleName = "";
  
      /**
       * Initialize the scraper. Clears static context and sets the module name.
       *
       * @param newModuleName the module name.
       */
      public static void initialize(String newModuleName) {
          JAVADOC_FOR_MODULE_OR_PROPERTY.clear();
          moduleName = newModuleName;
      }
  
      /**
       * Get the module or property javadocs map.
       *
       * @return the javadocs.
       */
      public static Map<String, DetailNode> getJavadocsForModuleOrProperty() {
          return Collections.unmodifiableMap(JAVADOC_FOR_MODULE_OR_PROPERTY);
      }
  
      @Override
      public int[] getDefaultJavadocTokens() {
          return new int[] {
              JavadocTokenTypes.JAVADOC,
          };
      }
  
      @Override
      public void visitJavadocToken(DetailNode ast) {
          final DetailAST blockCommentAst = getBlockCommentAst();
          if (BlockCommentPosition.isOnMethod(blockCommentAst)) {
              final DetailAST methodDef = getParentAst(blockCommentAst, TokenTypes.METHOD_DEF);
              if (methodDef != null
                      && isSetterMethod(methodDef)
                      && isMethodOfScrapedModule(methodDef)) {
                  final String methodName = methodDef.findFirstToken(TokenTypes.IDENT).getText();
                  final String propertyName = getPropertyName(methodName);
                  JAVADOC_FOR_MODULE_OR_PROPERTY.put(propertyName, ast);
              }
  
          }
          else if (BlockCommentPosition.isOnClass(blockCommentAst)) {
              final DetailAST classDef = getParentAst(blockCommentAst, TokenTypes.CLASS_DEF);
              if (classDef != null) {
                  final String className = classDef.findFirstToken(TokenTypes.IDENT).getText();
                  if (className.equals(moduleName)) {
                      JAVADOC_FOR_MODULE_OR_PROPERTY.put(moduleName, ast);
                  }
             }
         }
     }
 
     /**
      * Checks if the given method is a method of the module being scraped. Traverses
      * parent nodes until it finds the class definition and checks if the class name
      * is the same as the module name. We want to avoid scraping javadocs from
      * inner classes.
      *
      * @param methodDef the method definition.
      * @return true if the method is a method of the given module, false otherwise.
      */
     private static boolean isMethodOfScrapedModule(DetailAST methodDef) {
         final DetailAST classDef = getParentAst(methodDef, TokenTypes.CLASS_DEF);
 
         boolean isMethodOfModule = false;
         if (classDef != null) {
             final String className = classDef.findFirstToken(TokenTypes.IDENT).getText();
             isMethodOfModule = className.equals(moduleName);
         }
 
         return isMethodOfModule;
     }
 
     /**
      * Get the parent node of the given type. Traverses up the tree until it finds
      * the given type.
      *
      * @param ast the node to start traversing from.
      * @param type the type of the parent node to find.
      * @return the parent node of the given type, or null if not found.
      */
     private static DetailAST getParentAst(DetailAST ast, int type) {
         DetailAST node = ast.getParent();
 
         while (node != null && node.getType() != type) {
             node = node.getParent();
         }
 
         return node;
     }
 
     /**
      * Get the property name from the setter method name. For example, getPropertyName("setFoo")
      * returns "foo". This method removes the "set" prefix and decapitalizes the first letter
      * of the property name.
      *
      * @param setterName the setter method name.
      * @return the property name.
      */
     private static String getPropertyName(String setterName) {
         return Introspector.decapitalize(setterName.substring("set".length()));
     }
 
     /**
      * Returns whether an AST represents a setter method.
      *
      * @param ast the AST to check with
      * @return whether the AST represents a setter method
      */
     private static boolean isSetterMethod(DetailAST ast) {
         boolean setterMethod = false;
 
         if (ast.getType() == TokenTypes.METHOD_DEF) {
             final DetailAST type = ast.findFirstToken(TokenTypes.TYPE);
             final String name = type.getNextSibling().getText();
             final Pattern setterPattern = Pattern.compile("^set[A-Z].*");
 
             setterMethod = setterPattern.matcher(name).matches();
         }
         return setterMethod;
     }
 }