(function () {
  'use strict';

  var name = 'adNodeMetaView';
  angular.module('app.directive')
    .directive('adNodeMetaView', ['$parse', function ($parse) {

      var fieldMap = {
        added: {
          added: 'date',
          addedIp: 'ip',
          addedUserId: 'userId',
          addedUserName: 'userName'
        },
        changed: {
          changed: 'date',
          changedIp: 'ip',
          changedUserId: 'userId',
          changedUserName: 'userName'
        }
      };

      return {
        replace: true,
        templateUrl: 'directive/' + name + '/' + name + '.html',
        scope: {},
        link: function (scope, element, attr) {
          scope.data = null;

          var mode = attr[name + 'Mode'];
          if (!fieldMap.hasOwnProperty(mode)) {
            throw new Error('[app.directive.adNodeMetaView] wrong attr ad-node-meta-view-mode "' + mode + '"');
          }

          var expr = $parse(attr[name]);

          var extractData = function (source, mapping) {
            var src, result = {};
            for (src in mapping) {
              if (mapping.hasOwnProperty(src) && source.hasOwnProperty(src)) {
                result[mapping[src]] = source[src];
              }
            }
            return result;
          };

          scope.$parent.$watch(function () {
            return expr(scope.$parent);
          }, function (value) {
            if (value) {
              scope.data = extractData(value, fieldMap[mode]);
            }
          });

        }
      };
    }]);
})();