/**
   * @fileoverview Rule to flag when using constructor without parentheses
   * @author Ilya Volodin
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  const astUtils = require("../ast-utils");
  
  //------------------------------------------------------------------------------
  // Helpers
  //------------------------------------------------------------------------------
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "require parentheses when invoking a constructor with no arguments",
              category: "Stylistic Issues",
              recommended: false
          },
  
          schema: [],
  
          fixable: "code"
      },
  
      create(context) {
          const sourceCode = context.getSourceCode();
  
          return {
              NewExpression(node) {
                  if (node.arguments.length !== 0) {
                      return;  // shortcut: if there are arguments, there have to be parens
                  }
  
                  const lastToken = sourceCode.getLastToken(node);
                  const hasLastParen = lastToken && astUtils.isClosingParenToken(lastToken);
                  const hasParens = hasLastParen && astUtils.isOpeningParenToken(sourceCode.getTokenBefore(lastToken));
  
                  if (!hasParens) {
                      context.report({
                          node,
                          message: "Missing '()' invoking a constructor.",
                          fix: fixer => fixer.insertTextAfter(node, "()")
                      });
                  }
              }
          };
      }
  };