From d98522d643db4bb4bab44efbb2772d259ac0166c Mon Sep 17 00:00:00 2001
From: cfngc4594 <cfngc4594@gmail.com>
Date: Mon, 14 Apr 2025 23:15:41 +0800
Subject: [PATCH] feat(i18n): add locale management and configuration

---
 src/config/i18n.ts  |  9 +++++++++
 src/i18n/locale.ts  | 31 +++++++++++++++++++++++++++++++
 src/i18n/request.ts | 11 +++++++++++
 3 files changed, 51 insertions(+)
 create mode 100644 src/config/i18n.ts
 create mode 100644 src/i18n/locale.ts
 create mode 100644 src/i18n/request.ts

diff --git a/src/config/i18n.ts b/src/config/i18n.ts
new file mode 100644
index 0000000..b78af16
--- /dev/null
+++ b/src/config/i18n.ts
@@ -0,0 +1,9 @@
+// Supported locales
+export const locales = ["en", "zh"] as const;
+export type Locale = (typeof locales)[number];
+
+// Default locale
+export const defaultLocale: Locale = "en";
+
+// Cookie key for storing selected locale
+export const LOCALE_COOKIE_NAME = "LOCALE";
diff --git a/src/i18n/locale.ts b/src/i18n/locale.ts
new file mode 100644
index 0000000..145cd8e
--- /dev/null
+++ b/src/i18n/locale.ts
@@ -0,0 +1,31 @@
+"use server";
+
+import {
+  defaultLocale,
+  Locale,
+  LOCALE_COOKIE_NAME,
+  locales
+} from "@/config/i18n";
+import { cookies, headers } from "next/headers";
+
+export async function getUserLocale() {
+  const cookieLocale = (await cookies()).get(LOCALE_COOKIE_NAME)?.value;
+
+  if (cookieLocale && locales.includes(cookieLocale as Locale)) {
+    return cookieLocale as Locale;
+  }
+
+  const acceptLanguage = (await headers()).get("accept-language") || "";
+  const firstLang = acceptLanguage.split(",")[0]?.trim().toLowerCase();
+  const langPrefix = firstLang?.slice(0, 2);
+
+  if (locales.includes(langPrefix as Locale)) {
+    return langPrefix as Locale;
+  }
+
+  return defaultLocale;
+}
+
+export async function setUserLocale(locale: Locale) {
+  (await cookies()).set(LOCALE_COOKIE_NAME, locale);
+}
diff --git a/src/i18n/request.ts b/src/i18n/request.ts
new file mode 100644
index 0000000..7ed0601
--- /dev/null
+++ b/src/i18n/request.ts
@@ -0,0 +1,11 @@
+import { getUserLocale } from '@/i18n/locale';
+import { getRequestConfig } from 'next-intl/server';
+
+export default getRequestConfig(async () => {
+  const locale = await getUserLocale();
+
+  return {
+    locale,
+    messages: (await import(`../../messages/${locale}.json`)).default
+  };
+});