/**
   * @fileoverview CheckStyle XML reporter
   * @author Ian Christian Myers
   */
  "use strict";
  
  const xmlEscape = require("../util/xml-escape");
  
  //------------------------------------------------------------------------------
  // Helper Functions
  //------------------------------------------------------------------------------
  
  /**
   * Returns the severity of warning or error
   * @param {Object} message message object to examine
   * @returns {string} severity level
   * @private
   */
  function getMessageType(message) {
      if (message.fatal || message.severity === 2) {
          return "error";
      }
      return "warning";
  
  }
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  module.exports = function(results) {
  
      let output = "";
  
      output += "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
      output += "<checkstyle version=\"4.3\">";
  
      results.forEach(result => {
          const messages = result.messages;
  
          output += `<file name="${xmlEscape(result.filePath)}">`;
  
          messages.forEach(message => {
              output += [
                  `<error line="${xmlEscape(message.line)}"`,
                  `column="${xmlEscape(message.column)}"`,
                  `severity="${xmlEscape(getMessageType(message))}"`,
                  `message="${xmlEscape(message.message)}${message.ruleId ? ` (${message.ruleId})` : ""}"`,
                  `source="${message.ruleId ? xmlEscape(`eslint.rules.${message.ruleId}`) : ""}" />`
              ].join(" ");
          });
  
          output += "</file>";
  
      });
  
      output += "</checkstyle>";
  
      return output;
  };