67 lines
2.2 KiB
TypeScript
67 lines
2.2 KiB
TypeScript
'use client';
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import { createContext, useContext, useEffect, ReactNode } from 'react';
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import { useTranslation } from 'react-i18next';
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import { type Locale, defaultLocale, supportedLocales } from '@/lib/i18n';
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import '@/lib/i18n/config';
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const LOCALE_STORAGE_KEY = 'locale';
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/** Match a browser language code (e.g. 'en', 'zh-TW') to a supported locale */
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function resolveLocale(lang: string): Locale {
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// Exact match
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const exact = supportedLocales.find((l) => l.code === lang);
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if (exact) return exact.code;
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// Prefix match: 'en' → 'en-US', 'zh' → 'zh-CN'
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const prefix = lang.split('-')[0].toLowerCase();
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const match = supportedLocales.find((l) => l.code.toLowerCase().startsWith(prefix));
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return match?.code ?? defaultLocale;
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}
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type I18nContextType = {
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locale: Locale;
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setLocale: (locale: Locale) => void;
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t: (key: string, options?: Record<string, unknown>) => string;
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};
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const I18nContext = createContext<I18nContextType | undefined>(undefined);
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export function I18nProvider({ children }: { children: ReactNode }) {
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const { t, i18n } = useTranslation();
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const locale = (i18n.language || defaultLocale) as Locale;
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// Detect language after hydration to avoid SSR mismatch.
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// i18next handles fallback automatically: if the detected language
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// has no matching JSON file, it falls back to fallbackLng.
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useEffect(() => {
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try {
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const stored = localStorage.getItem(LOCALE_STORAGE_KEY);
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const raw = stored || navigator.language || defaultLocale;
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const target = resolveLocale(raw);
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if (target !== i18n.language) i18n.changeLanguage(target);
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} catch {
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// localStorage unavailable, keep default
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}
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}, []); // eslint-disable-line react-hooks/exhaustive-deps
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const setLocale = (newLocale: Locale) => {
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i18n.changeLanguage(newLocale);
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try {
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localStorage.setItem(LOCALE_STORAGE_KEY, newLocale);
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} catch {
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// localStorage unavailable
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}
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};
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return <I18nContext.Provider value={{ locale, setLocale, t }}>{children}</I18nContext.Provider>;
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}
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export function useI18n() {
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const context = useContext(I18nContext);
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if (!context) {
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throw new Error('useI18n must be used within I18nProvider');
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}
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return context;
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}
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