epha-robot/lib/history/addNewEntriesToHistory.js

Fetching, cleaning, transforming of pharmaceutical data from public resources

"use strict";

/**
 *
 * @param {{gtin: {}}} history
 * @param {{gtin: {}}} newEntries
 * @param {function(string, {})} onNew - optional, will pass GTIN
 * @returns {[{gtin: {}}, {new: Number}]} - updated history
 */
function addNewEntriesToHistory(history, newEntries, onNew) {
  var gtin, newEntry, isGtinRegistered, newEntryCount = 0;

  for (gtin in newEntries) {
    if (newEntries.hasOwnProperty(gtin)) {
      newEntry = newEntries[gtin];
      isGtinRegistered = history[gtin];

      if (isGtinRegistered) {
        throw new Error("addNewEntriesToHistory: GTIN " + gtin + " is already registered. Can't apply GTIN.");
      }

      onNew(gtin, newEntry);

      history[gtin] = newEntry;
      newEntryCount++;
    }
  }

  return [history, {"new": newEntryCount}];
}

module.exports = addNewEntriesToHistory;