"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = Resources;
var NONE = exports.NONE = {};

function Resources(resources, accessors) {
  return {
    map: function map(fn) {
      if (!resources) return [fn([NONE, null], 0)];
      return resources.map(function (resource, idx) {
        return fn([accessors.resourceId(resource), resource], idx);
      });
    },
    groupEvents: function groupEvents(events) {
      var eventsByResource = new window.Map();

      if (!resources) {
        // Return all events if resources are not provided
        eventsByResource.set(NONE, events);
        return eventsByResource;
      }

      events.forEach(function (event) {
        var id = accessors.resource(event) || NONE;
        var resourceEvents = eventsByResource.get(id) || [];
        resourceEvents.push(event);
        eventsByResource.set(id, resourceEvents);
      });
      return eventsByResource;
    }
  };
}