habitica/website/common/script/libs/inAppRewards.js

import getItemInfo from './getItemInfo';
import shops from './shops';
import getOfficialPinnedItems from './getOfficialPinnedItems';
import compactArray from 'lodash/compact';

import getItemByPathAndType from './getItemByPathAndType';
import {checkPinnedAreasForNullEntries} from '../ops/pinnedGearUtils';

/**
 * Orders the pinned items so we always get our inAppRewards in the order
 * which the user has saved
 *
 * @param user is the user
 * @param items is the combined list of pinned items to sort
 * @return items of ordered inAppRewards
 */
function sortInAppRewards (user, items) {
  let pinnedItemsOrder = user.pinnedItemsOrder;
  let orderedItems = [];
  let unorderedItems = []; // what we want to add later

  items.forEach((item, index) => {
    let i = pinnedItemsOrder[index] === item.path ? index : pinnedItemsOrder.indexOf(item.path);
    if (i === -1) {
      unorderedItems.push(item);
    } else {
      orderedItems[i] = item;
    }
  });
  orderedItems = compactArray(orderedItems);
  orderedItems = unorderedItems.concat(orderedItems);
  return orderedItems;
}

export default function getPinnedItems (user) {
  checkPinnedAreasForNullEntries(user);

  let officialPinnedItems = getOfficialPinnedItems(user);

  const officialPinnedItemsNotUnpinned = officialPinnedItems.filter(officialPin => {
    const isUnpinned = user.unpinnedItems.findIndex(unpinned => unpinned.path === officialPin.path) > -1;
    return !isUnpinned;
  });

  const pinnedItems = officialPinnedItemsNotUnpinned.concat(user.pinnedItems);

  let items = pinnedItems
    .map(({type, path}) => {
      let item = getItemByPathAndType(type, path);

      return getItemInfo(user, type, item, officialPinnedItems);
    });

  shops.checkMarketGearLocked(user, items);

  let orderedItems = sortInAppRewards(user, items);
  return orderedItems;
}