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| 1 | +import createHistory from "history/createBrowserHistory"; |
| 2 | +import queryString from "query-string"; |
| 3 | +import { create } from "../types/SortOption"; |
| 4 | + |
| 5 | +function isNumeric(num) { |
| 6 | + return !isNaN(num); |
| 7 | +} |
| 8 | + |
| 9 | +function toSingleValue(val) { |
| 10 | + if (Array.isArray(val)) val = val[val.length - 1]; |
| 11 | + return val; |
| 12 | +} |
| 13 | + |
| 14 | +function toSingleValueInteger(num) { |
| 15 | + return toInteger(toSingleValue(num)); |
| 16 | +} |
| 17 | + |
| 18 | +function toInteger(num) { |
| 19 | + if (!isNumeric(num)) return; |
| 20 | + return parseInt(num, 10); |
| 21 | +} |
| 22 | + |
| 23 | +function parseFiltersFromQueryParams(queryParams) { |
| 24 | + const filters = Object.keys(queryParams).reduce((acc, paramName) => { |
| 25 | + if (paramName.startsWith("f-")) { |
| 26 | + let paramValue = queryParams[paramName]; |
| 27 | + if (!paramValue) return acc; |
| 28 | + const filterName = paramName.replace("f-", ""); |
| 29 | + acc.push({ |
| 30 | + [filterName]: paramValue |
| 31 | + }); |
| 32 | + } |
| 33 | + return acc; |
| 34 | + }, []); |
| 35 | + |
| 36 | + if (filters.length === 0) return; |
| 37 | + return filters; |
| 38 | +} |
| 39 | + |
| 40 | +function parseCurrentFromQueryParams(queryParams) { |
| 41 | + return toSingleValueInteger(queryParams.current); |
| 42 | +} |
| 43 | + |
| 44 | +function parseSearchTermFromQueryParams(queryParams) { |
| 45 | + return toSingleValue(queryParams.q); |
| 46 | +} |
| 47 | + |
| 48 | +function parseSortFromQueryParams(queryParams) { |
| 49 | + const sortBy = toSingleValue(queryParams["sort-by"]); |
| 50 | + const sortDirection = toSingleValue(queryParams["sort-direction"]); |
| 51 | + |
| 52 | + if (sortBy) { |
| 53 | + return create({ |
| 54 | + value: sortBy, |
| 55 | + direction: sortDirection |
| 56 | + }); |
| 57 | + } |
| 58 | + |
| 59 | + return; |
| 60 | +} |
| 61 | + |
| 62 | +function parseSizeFromQueryParams(queryParams) { |
| 63 | + return toSingleValueInteger(queryParams.size); |
| 64 | +} |
| 65 | + |
| 66 | +/** |
| 67 | + * The URL Manager is responsible for synchronizing state between |
| 68 | + * AppSearchDriver and the URL. There are 3 main cases to handle when |
| 69 | + * synchronizing: |
| 70 | + * |
| 71 | + * 1. When the app loads, AppSearchDriver will need to |
| 72 | + * read the current state from the URL, in order to perform the search |
| 73 | + * expressed by the query string. `getStateFromURL` is used for this case. |
| 74 | + * |
| 75 | + * 2. When the URL changes as a result of `pushState` or `replaceState`, |
| 76 | + * AppSearchDriver will need to be notified and given the updated state, so that |
| 77 | + * it can re-run the current search. `onURLStateChange` is used for this case. |
| 78 | + * |
| 79 | + * 3. When state changes in AppSearchDriver, the URL will need to be updated |
| 80 | + * to reflect those changes. `onURLStateChange` is used for this case. |
| 81 | + */ |
| 82 | + |
| 83 | +export default class URLManager { |
| 84 | + constructor() { |
| 85 | + this.history = createHistory(); |
| 86 | + } |
| 87 | + |
| 88 | + getStateFromURL() { |
| 89 | + const state = paramsToState( |
| 90 | + queryString.parse(this.history.location.search) |
| 91 | + ); |
| 92 | + return state; |
| 93 | + } |
| 94 | + |
| 95 | + pushStateToURL(state) {} |
| 96 | + |
| 97 | + onURLStateChange() {} |
| 98 | +} |
| 99 | + |
| 100 | +function paramsToState(queryParams) { |
| 101 | + const state = { |
| 102 | + current: parseCurrentFromQueryParams(queryParams), |
| 103 | + filters: parseFiltersFromQueryParams(queryParams), |
| 104 | + searchTerm: parseSearchTermFromQueryParams(queryParams), |
| 105 | + resultsPerPage: parseSizeFromQueryParams(queryParams), |
| 106 | + sort: parseSortFromQueryParams(queryParams) |
| 107 | + }; |
| 108 | + |
| 109 | + return Object.keys(state).reduce((acc, key) => { |
| 110 | + const value = state[key]; |
| 111 | + if (value) acc[key] = value; |
| 112 | + return acc; |
| 113 | + }, {}); |
| 114 | +} |
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