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.DiagnosticParameter;
  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.Ranges;
  import com.github._1c_syntax.bsl.languageserver.utils.Trees;
  import com.github._1c_syntax.bsl.parser.BSLParser;
  import org.antlr.v4.runtime.Token;
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.antlr.v4.runtime.tree.TerminalNode;
  
  import java.util.stream.Stream;
  
  @DiagnosticMetadata(
    type = DiagnosticType.CODE_SMELL,
    severity = DiagnosticSeverity.MAJOR,
    minutesToFix = 5,
    tags = {
      DiagnosticTag.BADPRACTICE,
      DiagnosticTag.SUSPICIOUS
    }
  )
  public class EmptyCodeBlockDiagnostic extends AbstractVisitorDiagnostic {
  
    private static final boolean DEFAULT_COMMENT_AS_CODE = false;
  
    @DiagnosticParameter(
      type = Boolean.class,
      defaultValue = "" + DEFAULT_COMMENT_AS_CODE
    )
    private boolean commentAsCode = DEFAULT_COMMENT_AS_CODE;
  
    @Override
    public ParseTree visitCodeBlock(BSLParser.CodeBlockContext ctx) {
  
      boolean isFileBlock = ctx.getParent() instanceof BSLParser.FileContext
        || ctx.getParent() instanceof BSLParser.FileCodeBlockBeforeSubContext
        || ctx.getParent() instanceof BSLParser.FileCodeBlockContext;
  
      if (ctx.getChildCount() > 0
        || isFileBlock
        || ctx.getParent() instanceof BSLParser.SubCodeBlockContext
        || ctx.getParent() instanceof BSLParser.ExceptCodeBlockContext) {
        return super.visitCodeBlock(ctx);
      }
  
      if (commentAsCode) {
        Stream<Token> comments = documentContext.getComments().stream();
        var rangeCodeBlock = Ranges.create(ctx.getStop(), ctx.getStart());
        if (comments.anyMatch(token ->
          Ranges.containsRange(
            rangeCodeBlock,
            Ranges.create(token)))) {
          return super.visitCodeBlock(ctx);
        }
      }
  
      int lineOfStop = ctx.getStop().getLine();
  
      var list = Trees.getChildren(ctx.getParent()).stream()
        .filter(TerminalNode.class::isInstance)
        .filter(node -> ((TerminalNode) node).getSymbol().getLine() == lineOfStop)
        .toList();
  
      if (!list.isEmpty()) {
        TerminalNode first = (TerminalNode) list.get(0);
        TerminalNode last = (TerminalNode) list.get(list.size() - 1);
  
        diagnosticStorage.addDiagnostic(first, last);
      } else {
        diagnosticStorage.addDiagnostic(ctx.getParent().getStop());
      }
  
      return super.visitCodeBlock(ctx);
    }
  }
  