/**
   * @fileoverview require default case in switch statements
   * @author Aliaksei Shytkin
   */
  "use strict";
  
  var COMMENT_VALUE = "no default";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = function(context) {
  
      //--------------------------------------------------------------------------
      // Helpers
      //--------------------------------------------------------------------------
  
      /**
       * Shortcut to get last element of array
       * @param  {*[]} collection Array
       * @returns {*} Last element
       */
      function last(collection) {
          return collection[collection.length - 1];
      }
  
      //--------------------------------------------------------------------------
      // Public
      //--------------------------------------------------------------------------
  
      return {
  
          "SwitchStatement": function(node) {
  
              if (!node.cases.length) {
                  // skip check of empty switch because there is no easy way
                  // to extract comments inside it now
                  return;
              }
  
              var hasDefault = node.cases.some(function(v) {
                  return v.test === null;
              });
  
              if (!hasDefault) {
  
                  var comment;
                  var comments;
  
                  var lastCase = last(node.cases);
                  comments = context.getComments(lastCase).trailing;
  
                  if (comments.length) {
                      comment = last(comments);
                  }
  
                  if (!comment || comment.value.trim() !== COMMENT_VALUE) {
                      context.report(node, "Expected a default case.");
                  }
              }
          }
      };
  };
  
  module.exports.schema = [];