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/*
This file is part of GNU Anastasis
(C) 2021-2022 Anastasis SARL
GNU Anastasis is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
GNU Anastasis; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import {
StorageState,
buildStorageKey,
useLocalStorage,
} from "./useLocalStorage.js";
const MIN_LANG_COVERAGE_THRESHOLD = 90;
/**
* choose the best from the browser config based on the completeness
* on the translation
*/
function getBrowserLang(completeness: Record<string, number>): string | undefined {
if (typeof window === "undefined") return undefined;
if (window.navigator.language) {
if (completeness[window.navigator.language] >= MIN_LANG_COVERAGE_THRESHOLD) {
return window.navigator.language
}
}
if (window.navigator.languages) {
const match = Object.entries(completeness).filter(([code, value]) => {
if (value < MIN_LANG_COVERAGE_THRESHOLD) return false; //do not consider langs below 90%
return window.navigator.languages.findIndex(l => l.startsWith(code)) !== -1
}).map(([code, value]) => ({ code, value }))
if (match.length > 0) {
let max = match[0]
match.forEach(v => {
if (v.value > max.value) {
max = v
}
})
return max.code
}
};
return undefined;
}
const langPreferenceKey = buildStorageKey("lang-preference");
export function useLang(initial: string | undefined, completeness: Record<string, number>): Required<StorageState> {
const defaultValue = (getBrowserLang(completeness) || initial || "en").substring(0, 2);
return useLocalStorage(langPreferenceKey, defaultValue);
}
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