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.context.symbol.variable.VariableKind;
  import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticMetadata;
  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.bsl.parser.BSLParser.CallStatementContext;
  import com.github._1c_syntax.bsl.parser.BSLParser.ComplexIdentifierContext;
  import com.github._1c_syntax.bsl.parser.BSLParser.LValueContext;
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.antlr.v4.runtime.tree.TerminalNode;
  
  import java.util.function.Predicate;
  
  @DiagnosticMetadata(
    type = DiagnosticType.ERROR,
    severity = DiagnosticSeverity.CRITICAL,
    minutesToFix = 2,
    tags = {
      DiagnosticTag.CLUMSY
    }
  )
  public class UseLessForEachDiagnostic extends AbstractVisitorDiagnostic {
  
    private static Predicate<ParseTree> parentClassMatchTo(Class<?> clazzName) {
      return e -> e.getParent().getClass().equals(clazzName);
    }
  
    @Override
    public ParseTree visitForEachStatement(BSLParser.ForEachStatementContext ctx) {
  
      TerminalNode iterator = ctx.IDENTIFIER();
      String iteratorIdName = iterator.getText();
  
      boolean isVariable = documentContext.getSymbolTree().getVariables()
        .stream()
        .filter(variableSymbol -> variableSymbol.getKind() == VariableKind.GLOBAL
          || variableSymbol.getKind() == VariableKind.MODULE)
        .anyMatch(variableSymbol -> variableSymbol.getName().equalsIgnoreCase(iteratorIdName));
  
      if (isVariable) {
        return super.visitForEachStatement(ctx);
      }
  
      boolean hasUsage = Trees.findAllTokenNodes(ctx.codeBlock(), BSLParser.IDENTIFIER)
        .stream()
        .filter(node -> iteratorIdName.equalsIgnoreCase(node.getText()))
        .anyMatch(parentClassMatchTo(ComplexIdentifierContext.class)
          .or(parentClassMatchTo(LValueContext.class))
          .or(parentClassMatchTo(CallStatementContext.class)));
  
      if (!hasUsage) {
        diagnosticStorage.addDiagnostic(iterator.getSymbol());
      }
  
      return super.visitForEachStatement(ctx);
    }
  
  }
  
  
  