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const extension = require('extensionizer')
const promisify = require('pify')
const allLocales = require('../../_locales/index.json')
const log = require('loglevel')
// as far as i can tell, this is truthy in the case of Brave browser
// where extension.i18n.getAcceptLanguages throws due to not being implemented
// Unchecked runtime.lastError while running i18n.getAcceptLanguages: Access to extension API denied.
// https://stackoverflow.com/questions/28431505/unchecked-runtime-lasterror-when-using-chrome-api
const isSupported = extension.i18n && extension.i18n.getAcceptLanguages
const getPreferredLocales = isSupported ? promisify(
extension.i18n.getAcceptLanguages,
{ errorFirst: false }
) : async () => []
const existingLocaleCodes = allLocales.map(locale => locale.code.toLowerCase().replace('_', '-'))
/**
* Returns a preferred language code, based on settings within the user's browser. If we have no translations for the
* users preferred locales, 'en' is returned.
*
* @returns {Promise<string>} Promises a locale code, either one from the user's preferred list that we have a translation for, or 'en'
*
*/
async function getFirstPreferredLangCode () {
let userPreferredLocaleCodes = await getPreferredLocales()
if(!userPreferredLocaleCodes){
userPreferredLocaleCodes = []
}
log.debug(`user preferredLocaleCodes: ${userPreferredLocaleCodes}`)
const firstPreferredLangCode = userPreferredLocaleCodes
.map(code => code.toLowerCase())
.find(code => existingLocaleCodes.includes(code))
return firstPreferredLangCode || 'en'
}
module.exports = getFirstPreferredLangCode
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