import configuration from '@intlayer/config/built';
import { localeDetector } from '@intlayer/core';
import { type Locale, Locales } from '@intlayer/types';
import { cookies, headers } from 'next/headers.js';
// Helper function to extract locale from referer URL
export const getLocale = async (): Promise<Locale> => {
const { defaultLocale } = configuration?.internationalization ?? {};
const { headerName, cookieName } = configuration?.middleware ?? {};
if (!headerName || !cookieName) return Locales.ENGLISH;
// 1 - Try to pick the locale selected using the headers
const headersList = await headers();
const headerLocale = headersList.get(headerName) as Locale | undefined;
if (headerLocale) return headerLocale;
// 2 - Try to pick the locale selected using the cookies
const cookiesList = await cookies();
const cookieLocale = cookiesList.get(cookieName)?.value as Locale | undefined;
if (cookieLocale) return cookieLocale;
// 3 - Try to pick the locale selected using the browser language preference
const negotiatorHeaders: Record<string, string> = {};
headersList.forEach((value, key) => {
negotiatorHeaders[key] = value;
});
const userFallbackLocale = localeDetector(negotiatorHeaders);
// 4 - Fallback to default locale
if (userFallbackLocale) return userFallbackLocale as Locale;
return defaultLocale;
};
