"use strict";

const mapAsync = require("../map-async");
const All = require("../dlayer-symbol-all");

module.exports = function evaluateSingle({ command, selectResult }) {
	return function (ids) {
		return mapAsync(ids, async (id) => {
			if (id === All) {
				throw new Error(`This data source does not support fetching all entries`);
			} else {
				let result = await command(id);

				return (selectResult != null)
					? selectResult(result)
					: result;
			}
		});
	};
};