69 lines
2.5 KiB
JavaScript
69 lines
2.5 KiB
JavaScript
import { masks } from 'dateformat';
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import { get } from 'lodash';
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import { formatDate } from '~/lib/utils/datetime_utility';
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const { isoDate } = masks;
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/**
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* Takes an array of items and returns one item per month with the average of the `count`s from that month
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* @param {Array} items
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* @param {Number} items[index].count value to be averaged
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* @param {String} items[index].recordedAt item dateTime time stamp to be collected into a month
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* @param {Object} options
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* @param {Object} options.shouldRound an option to specify whether the retuned averages should be rounded
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* @return {Array} items collected into [month, average],
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* where month is a dateTime string representing the first of the given month
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* and average is the average of the count
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*/
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export function getAverageByMonth(items = [], options = {}) {
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const { shouldRound = false } = options;
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const itemsMap = items.reduce((memo, item) => {
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const { count, recordedAt } = item;
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const date = new Date(recordedAt);
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const month = formatDate(new Date(date.getFullYear(), date.getMonth(), 1), isoDate);
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if (memo[month]) {
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const { sum, recordCount } = memo[month];
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return { ...memo, [month]: { sum: sum + count, recordCount: recordCount + 1 } };
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}
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return { ...memo, [month]: { sum: count, recordCount: 1 } };
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}, {});
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return Object.keys(itemsMap).map((month) => {
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const { sum, recordCount } = itemsMap[month];
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const avg = sum / recordCount;
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if (shouldRound) {
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return [month, Math.round(avg)];
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}
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return [month, avg];
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});
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}
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/**
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* Takes an array of instance counts and returns the last item in the list
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* @param {Array} arr array of instance counts in the form { count: Number, recordedAt: date String }
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* @return {String} the 'recordedAt' value of the earliest item
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*/
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export const getEarliestDate = (arr = []) => {
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const len = arr.length;
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return get(arr, `[${len - 1}].recordedAt`, null);
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};
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/**
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* Takes an array of queries and produces an object with the query identifier as key
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* and a supplied defaultValue as its value
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* @param {Array} queries array of chart query configs,
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* see ./analytics/instance_statistics/components/charts_config.js
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* @param {any} defaultValue value to set each identifier to
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* @return {Object} key value pair of the form { queryIdentifier: defaultValue }
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*/
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export const generateDataKeys = (queries, defaultValue) =>
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queries.reduce(
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(acc, { identifier }) => ({
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...acc,
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[identifier]: defaultValue,
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}),
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{},
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);
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