AugurProject/augur-ui

import { UPDATE_IS_FIRST_ORDER_BOOK_CHUNK_LOADED } from "modules/orders/actions/update-order-book";
import { RESET_STATE } from "modules/app/actions/reset-state";

const DEFAULT_STATE = {};

export default function(
  isFirstOrderBookChunkLoaded = DEFAULT_STATE,
  { type, data }
) {
  switch (type) {
    case UPDATE_IS_FIRST_ORDER_BOOK_CHUNK_LOADED: {
      const { marketId, outcome, orderTypeLabel, isLoaded } = data;
      return {
        ...isFirstOrderBookChunkLoaded,
        [marketId]: {
          ...(isFirstOrderBookChunkLoaded[marketId] || {}),
          [outcome]: {
            ...((isFirstOrderBookChunkLoaded[marketId] || {})[outcome] || {}),
            [orderTypeLabel]: isLoaded
          }
        }
      };
    }
    case RESET_STATE:
      return DEFAULT_STATE;
    default:
      return isFirstOrderBookChunkLoaded;
  }
}