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