/**
   * @fileoverview unix-style formatter.
   * @author oshi-shinobu
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Helper Functions
  //------------------------------------------------------------------------------
  
  /**
   * Returns a canonical error level string based upon the error message passed in.
   * @param {Object} message Individual error message provided by eslint
   * @returns {string} Error level string
   */
  function getMessageType(message) {
      if (message.fatal || message.severity === 2) {
          return "Error";
      }
      return "Warning";
  
  }
  
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  module.exports = function(results) {
  
      let output = "",
          total = 0;
  
      results.forEach(result => {
  
          const messages = result.messages;
  
          total += messages.length;
  
          messages.forEach(message => {
  
              output += `${result.filePath}:`;
              output += `${message.line || 0}:`;
              output += `${message.column || 0}:`;
              output += ` ${message.message} `;
              output += `[${getMessageType(message)}${message.ruleId ? `/${message.ruleId}` : ""}]`;
              output += "
  ";
  
          });
  
      });
  
      if (total > 0) {
          output += `
  ${total} problem${total !== 1 ? "s" : ""}`;
      }
  
      return output;
  };