content: /*
   * This file is a part of BSL Language Server.
   *
   * Copyright (c) 2018-2025
   * Alexey Sosnoviy <labotamy@gmail.com>, Nikita Fedkin <nixel2007@gmail.com> and contributors
   *
   * SPDX-License-Identifier: LGPL-3.0-or-later
   *
   * BSL Language Server 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 3.0 of the License, or (at your option) any later version.
   *
   * BSL Language Server 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 BSL Language Server.
   */
  package com.github._1c_syntax.bsl.languageserver.diagnostics;
  
  import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticMetadata;
  import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticScope;
  import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticSeverity;
  import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticTag;
  import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticType;
  import com.github._1c_syntax.bsl.languageserver.utils.Trees;
  import com.github._1c_syntax.bsl.parser.BSLParser;
  import com.github._1c_syntax.utils.CaseInsensitivePattern;
  import org.antlr.v4.runtime.tree.ParseTree;
  
  import java.util.Locale;
  import java.util.Objects;
  import java.util.regex.Pattern;
  import java.util.stream.Collectors;
  
  @DiagnosticMetadata(
    type = DiagnosticType.CODE_SMELL,
    severity = DiagnosticSeverity.MAJOR,
    scope = DiagnosticScope.OS,
    minutesToFix = 5,
    tags = {
      DiagnosticTag.DESIGN,
      DiagnosticTag.UNUSED
    }
  )
  public class UnusedParametersDiagnostic extends AbstractVisitorDiagnostic {
  
    private static final Pattern HANDLER_PATTERN = CaseInsensitivePattern.compile(
      "(ПриСозданииОбъекта|OnObjectCreate)"
    );
  
    @Override
    public ParseTree visitSubCodeBlock(BSLParser.SubCodeBlockContext ctx) {
  
      if (ctx.codeBlock().getChildCount() == 0
        || itsHandler(ctx)) {
        return ctx;
      }
  
      var params = Trees.findAllRuleNodes(ctx.getParent(), BSLParser.RULE_param)
        .stream()
        .map(BSLParser.ParamContext.class::cast)
        .map(BSLParser.ParamContext::IDENTIFIER)
        .filter(Objects::nonNull)
        .toList();
  
      var paramsNames = params
        .stream()
        .map(ind -> ind.getText().toLowerCase(Locale.getDefault()))
        .collect(Collectors.toList());
  
      Trees.findAllTokenNodes(ctx, BSLParser.IDENTIFIER)
        .stream()
        .filter(Objects::nonNull)
        .forEach(node ->
          paramsNames.remove((node.getText().toLowerCase(Locale.getDefault())))
        );
  
      params
        .stream()
        .filter(param -> paramsNames.contains(param.getText().toLowerCase(Locale.getDefault())))
        .forEach(param ->
          diagnosticStorage.addDiagnostic(param, info.getMessage(param.getText()))
        );
  
      return ctx;
    }
  
    private static boolean itsHandler(BSLParser.SubCodeBlockContext ctx) {
      var subNames = Trees.findAllRuleNodes(ctx.getParent(), BSLParser.RULE_subName).stream().findFirst();
      var subName = "";
      if (subNames.isPresent()) {
        subName = subNames.get().getText();
      }
      return HANDLER_PATTERN.matcher(subName).matches();
    }
  }
  