i10n using NextIntl

components/languageSwitcher.tsx

@@ -0,0 +1,24 @@
+import { useRouter } from 'next/router';
+import { useTranslations } from 'next-intl';
+
+// using https://next-intl-docs.vercel.app/docs/getting-started/pages-router
+const LanguageSwitcher = () => {
+    const t = useTranslations('common');
+    const router = useRouter();
+    const { locale, locales, asPath } = router;
+
+    return (
+        <div>
+            {locales.map((lng) => {
+                if (lng === locale) return null;
+                return (
+                    <button key={lng} onClick={() => router.push(asPath, asPath, { locale: lng })}>
+                        {t('changeTo')} {t(lng.toUpperCase())}
+                    </button>
+                );
+            })}
+        </div>
+    );
+};
+
+export default LanguageSwitcher;

components/layout.tsx

@@ -68,4 +68,5 @@ export default function Layout({ children }) {
       </div>
     </div>
   );
-}
+}
+

components/sidebar.tsx

@@ -5,6 +5,7 @@ import { useRouter } from 'next/router';
 import sidemenu, { footerMenu } from './sidemenuData.js'; // Move sidemenu data to a separate file
 import axiosInstance from "src/axiosSecure";
 import common from "src/helpers/common";
+import LanguageSwitcher from "./languageSwitcher";
 //get package version from package.json
 const packageVersion = require('../package.json').version;
 
@@ -145,6 +146,7 @@ export default function Sidebar({ isSidebarOpen, toggleSidebar }) {
             <div className="mt-auto">
               <hr className="border-gray-200 dark:border-gray-600 text-align-bottom" />
               <FooterSection />
+              <LanguageSwitcher />
             </div>
           </nav>
         </div>

content/i18n/bg.json

@@ -0,0 +1,10 @@
+{
+    "common": {
+        "greeting": "Здравей",
+        "farewell": "Довиждане",
+        "changeTo": "Смени на",
+        "BG": "Български",
+        "EN": "Английски",
+        "RU": "Руски"
+    }
+}

content/i18n/en.json

@@ -0,0 +1,10 @@
+{
+    "common": {
+        "greeting": "Hello",
+        "farewell": "Goodbye",
+        "changeTo": "Change to",
+        "BG": "Bulgarian",
+        "EN": "English",
+        "RU": "Russian"
+    }
+}

content/i18n/ru.json

@@ -0,0 +1,10 @@
+{
+    "common": {
+        "greeting": "Здравей",
+        "farewell": "Довиждане",
+        "changeTo": "Смени на",
+        "BG": "[RU] Български",
+        "EN": "[RU] Английски",
+        "RU": "[RU] Руски"
+    }
+}

next.config.js

@@ -50,4 +50,8 @@ module.exports = withPWA({
 
     return config;
   },
+  i18n: {    // using https://next-intl-docs.vercel.app/docs/getting-started/pages-router
+    locales: ['bg', 'en', 'ru'],
+    defaultLocale: 'bg',
+  },
 })

package-lock.json

@@ -55,6 +55,7 @@
         "next": "^14.1.0",
         "next-auth": "^4.24.6",
         "next-connect": "^1.0.0",
+        "next-intl": "^3.12.0",
         "next-pwa": "^5.6.0",
         "node-excel-export": "^1.4.4",
         "node-telegram-bot-api": "^0.64.0",
@@ -2194,6 +2195,92 @@
       "resolved": "https://registry.npmjs.org/@floating-ui/utils/-/utils-0.2.1.tgz",
       "integrity": "sha512-9TANp6GPoMtYzQdt54kfAyMmz1+osLlXdg2ENroU7zzrtflTLrrC/lgrIfaSe+Wu0b89GKccT7vxXA0MoAIO+Q=="
     },
+    "node_modules/@formatjs/ecma402-abstract": {
+      "version": "1.18.2",
+      "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-1.18.2.tgz",
+      "integrity": "sha512-+QoPW4csYALsQIl8GbN14igZzDbuwzcpWrku9nyMXlaqAlwRBgl5V+p0vWMGFqHOw37czNXaP/lEk4wbLgcmtA==",
+      "dependencies": {
+        "@formatjs/intl-localematcher": "0.5.4",
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@formatjs/ecma402-abstract/node_modules/@formatjs/intl-localematcher": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.5.4.tgz",
+      "integrity": "sha512-zTwEpWOzZ2CiKcB93BLngUX59hQkuZjT2+SAQEscSm52peDW/getsawMcWF1rGRpMCX6D7nSJA3CzJ8gn13N/g==",
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@formatjs/fast-memoize": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@formatjs/fast-memoize/-/fast-memoize-1.2.1.tgz",
+      "integrity": "sha512-Rg0e76nomkz3vF9IPlKeV+Qynok0r7YZjL6syLz4/urSg0IbjPZCB/iYUMNsYA643gh4mgrX3T7KEIFIxJBQeg==",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/icu-messageformat-parser": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-2.1.0.tgz",
+      "integrity": "sha512-Qxv/lmCN6hKpBSss2uQ8IROVnta2r9jd3ymUEIjm2UyIkUCHVcbUVRGL/KS/wv7876edvsPe+hjHVJ4z8YuVaw==",
+      "dependencies": {
+        "@formatjs/ecma402-abstract": "1.11.4",
+        "@formatjs/icu-skeleton-parser": "1.3.6",
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/icu-messageformat-parser/node_modules/@formatjs/ecma402-abstract": {
+      "version": "1.11.4",
+      "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-1.11.4.tgz",
+      "integrity": "sha512-EBikYFp2JCdIfGEb5G9dyCkTGDmC57KSHhRQOC3aYxoPWVZvfWCDjZwkGYHN7Lis/fmuWl906bnNTJifDQ3sXw==",
+      "dependencies": {
+        "@formatjs/intl-localematcher": "0.2.25",
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/icu-messageformat-parser/node_modules/@formatjs/intl-localematcher": {
+      "version": "0.2.25",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.2.25.tgz",
+      "integrity": "sha512-YmLcX70BxoSopLFdLr1Ds99NdlTI2oWoLbaUW2M406lxOIPzE1KQhRz2fPUkq34xVZQaihCoU29h0KK7An3bhA==",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/icu-skeleton-parser": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-skeleton-parser/-/icu-skeleton-parser-1.3.6.tgz",
+      "integrity": "sha512-I96mOxvml/YLrwU2Txnd4klA7V8fRhb6JG/4hm3VMNmeJo1F03IpV2L3wWt7EweqNLES59SZ4d6hVOPCSf80Bg==",
+      "dependencies": {
+        "@formatjs/ecma402-abstract": "1.11.4",
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/icu-skeleton-parser/node_modules/@formatjs/ecma402-abstract": {
+      "version": "1.11.4",
+      "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-1.11.4.tgz",
+      "integrity": "sha512-EBikYFp2JCdIfGEb5G9dyCkTGDmC57KSHhRQOC3aYxoPWVZvfWCDjZwkGYHN7Lis/fmuWl906bnNTJifDQ3sXw==",
+      "dependencies": {
+        "@formatjs/intl-localematcher": "0.2.25",
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/icu-skeleton-parser/node_modules/@formatjs/intl-localematcher": {
+      "version": "0.2.25",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.2.25.tgz",
+      "integrity": "sha512-YmLcX70BxoSopLFdLr1Ds99NdlTI2oWoLbaUW2M406lxOIPzE1KQhRz2fPUkq34xVZQaihCoU29h0KK7An3bhA==",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/@formatjs/intl-localematcher": {
+      "version": "0.2.32",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.2.32.tgz",
+      "integrity": "sha512-k/MEBstff4sttohyEpXxCmC3MqbUn9VvHGlZ8fauLzkbwXmVrEeyzS+4uhrvAk9DWU9/7otYWxyDox4nT/KVLQ==",
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
     "node_modules/@heroicons/react": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/@heroicons/react/-/react-2.1.1.tgz",
@@ -8947,6 +9034,34 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/intl-messageformat": {
+      "version": "9.13.0",
+      "resolved": "https://registry.npmjs.org/intl-messageformat/-/intl-messageformat-9.13.0.tgz",
+      "integrity": "sha512-7sGC7QnSQGa5LZP7bXLDhVDtQOeKGeBFGHF2Y8LVBwYZoQZCgWeKoPGTa5GMG8g/TzDgeXuYJQis7Ggiw2xTOw==",
+      "dependencies": {
+        "@formatjs/ecma402-abstract": "1.11.4",
+        "@formatjs/fast-memoize": "1.2.1",
+        "@formatjs/icu-messageformat-parser": "2.1.0",
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/intl-messageformat/node_modules/@formatjs/ecma402-abstract": {
+      "version": "1.11.4",
+      "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-1.11.4.tgz",
+      "integrity": "sha512-EBikYFp2JCdIfGEb5G9dyCkTGDmC57KSHhRQOC3aYxoPWVZvfWCDjZwkGYHN7Lis/fmuWl906bnNTJifDQ3sXw==",
+      "dependencies": {
+        "@formatjs/intl-localematcher": "0.2.25",
+        "tslib": "^2.1.0"
+      }
+    },
+    "node_modules/intl-messageformat/node_modules/@formatjs/intl-localematcher": {
+      "version": "0.2.25",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.2.25.tgz",
+      "integrity": "sha512-YmLcX70BxoSopLFdLr1Ds99NdlTI2oWoLbaUW2M406lxOIPzE1KQhRz2fPUkq34xVZQaihCoU29h0KK7An3bhA==",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
     "node_modules/invariant": {
       "version": "2.2.4",
       "resolved": "https://registry.npmjs.org/invariant/-/invariant-2.2.4.tgz",
@@ -10681,6 +10796,26 @@
         "node": ">=16"
       }
     },
+    "node_modules/next-intl": {
+      "version": "3.12.0",
+      "resolved": "https://registry.npmjs.org/next-intl/-/next-intl-3.12.0.tgz",
+      "integrity": "sha512-N3DHT6ce6K4VHVA3y2p3U7wfBx4c31qEgQSTFCFJuNnE7XYzy49O576ewEz7/k2YaB/U5bfxaWWaMMkskofwoQ==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/amannn"
+        }
+      ],
+      "dependencies": {
+        "@formatjs/intl-localematcher": "^0.2.32",
+        "negotiator": "^0.6.3",
+        "use-intl": "^3.12.0"
+      },
+      "peerDependencies": {
+        "next": "^10.0.0 || ^11.0.0 || ^12.0.0 || ^13.0.0 || ^14.0.0",
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0"
+      }
+    },
     "node_modules/next-pwa": {
       "version": "5.6.0",
       "resolved": "https://registry.npmjs.org/next-pwa/-/next-pwa-5.6.0.tgz",
@@ -17428,6 +17563,18 @@
       "resolved": "https://registry.npmjs.org/url-template/-/url-template-2.0.8.tgz",
       "integrity": "sha512-XdVKMF4SJ0nP/O7XIPB0JwAEuT9lDIYnNsK8yGVe43y0AWoKeJNdv3ZNWh7ksJ6KqQFjOO6ox/VEitLnaVNufw=="
     },
+    "node_modules/use-intl": {
+      "version": "3.12.0",
+      "resolved": "https://registry.npmjs.org/use-intl/-/use-intl-3.12.0.tgz",
+      "integrity": "sha512-tTJBSaxpVF1ZHqJ5+1JOaBsPmvBPscXHR0soMNQFWIURZspOueLaMXx1XHNdBv9KZGwepBju5aWXkJ0PM6ztXg==",
+      "dependencies": {
+        "@formatjs/ecma402-abstract": "^1.11.4",
+        "intl-messageformat": "^9.3.18"
+      },
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",

package.json

@@ -72,6 +72,7 @@
     "next": "^14.1.0",
     "next-auth": "^4.24.6",
     "next-connect": "^1.0.0",
+    "next-intl": "^3.12.0",
     "next-pwa": "^5.6.0",
     "node-excel-export": "^1.4.4",
     "node-telegram-bot-api": "^0.64.0",

pages/_app.tsx

@@ -6,7 +6,10 @@ import "tailwindcss/tailwind.css"
 
 import type { AppProps } from "next/app";
 import type { Session } from "next-auth";
-import { useEffect } from "react"
+import { useEffect, useState } from "react"
+import { useRouter } from "next/router";
+import { NextIntlClientProvider } from 'next-intl';
+
 // for fontawesome
 import Head from 'next/head';
 import { LocalizationProvider } from '@mui/x-date-pickers';
@@ -22,10 +25,32 @@ import { AdapterDayjs } from '@mui/x-date-pickers/AdapterDayjs'
 // }
 
 
-export default function App({
+export default function App({ Component, pageProps: { session, ...pageProps }, }: AppProps<{ session: Session }>) {
-  Component,
+  console.log(pageProps);
-  pageProps: { session, ...pageProps },
+  const router = useRouter();
-}: AppProps<{ session: Session }>) {
+  const [messages, setMessages] = useState({});
+
+  useEffect(() => {
+    console.log("Current locale:", router.locale);
+    async function loadLocaleData() {
+      const localeMessages = await import(`../content/i18n/${router.locale}.json`);
+      console.log("Loaded locale '", router.locale, "' ",);
+      //console.log("Loaded messages for locale:", router.locale, localeMessages.default);
+      setMessages(localeMessages.default);
+    }
+    loadLocaleData();
+  }, [router.locale]);
+
+  // useEffect(() => {
+  //   async function loadLocaleData() {
+  //     const locale = router.locale || 'en';
+  //     const messages = await fetch(`/api/translations/${locale}`).then(res => res.json());
+  //     setMessages(messages);
+  //   }
+
+  //   loadLocaleData();
+  // }, [router.locale]);
+
 
   useEffect(() => {
     const use = async () => {
@@ -67,11 +92,32 @@ export default function App({
 
   return (
     <>
-      <SessionProvider session={session} >
+      <NextIntlClientProvider
-        <LocalizationProvider dateAdapter={AdapterDayjs}>
+        locale={router.locale}
-          <Component {...pageProps} />
+        timeZone="Europe/Sofia"
-        </LocalizationProvider>
+        messages={messages}
-      </SessionProvider>
+      >
+        <SessionProvider session={session} >
+          <LocalizationProvider dateAdapter={AdapterDayjs}>
+            <Component {...pageProps} />
+          </LocalizationProvider>
+        </SessionProvider>
+      </NextIntlClientProvider>
     </>
   )
 }
+
+// build time localization. Is it working for _app.tsx?d
+// export async function getStaticProps(context) {
+//   const messages = (await import(`../content/i18n/${locale}.json`)).default;
+//   console.log("Loaded messages for locale:", locale, messages);
+//   return {
+//     props: {
+//       // You can get the messages from anywhere you like. The recommended
+//       // pattern is to put them in JSON files separated by locale and read
+//       // the desired one based on the `locale` received from Next.js.
+//       // messages: (await import(`../content/i18n/${context.locale}.json`)).default
+//       messages
+//     }
+//   };
+// }

pages/api/translations/[...locale].ts

@@ -0,0 +1,37 @@
+import fs from 'fs';
+import path from 'path';
+import { NextApiRequest, NextApiResponse } from 'next';
+type Translations = {
+    [key: string]: string;
+};
+export default async function handler(req: NextApiRequest, res: NextApiResponse) {
+    const { locale } = req.query;
+
+    const filePath = path.join(process.cwd(), `content/i18n/${locale}.json`);
+    const translations: Translations = JSON.parse(fs.readFileSync(filePath, 'utf8'));
+
+    switch (req.method) {
+        case 'GET':
+            try {
+                res.status(200).json(translations);
+            } catch (error) {
+                console.error('Error reading translation file:', error);
+                res.status(500).json({ error: 'Failed to read translation file' });
+            }
+            break;
+
+        case 'POST': try {
+            const newTranslations = req.body;
+            fs.writeFileSync(filePath, JSON.stringify(newTranslations, null, 2), 'utf8');
+            res.status(200).json({ status: 'Updated' });
+        } catch (error) {
+            console.error('Error writing translation file:', error);
+            res.status(500).json({ error: 'Failed to update translation file' });
+        }
+            break;
+
+        default:
+            res.setHeader('Allow', ['GET', 'POST']);
+            res.status(405).end(`Method ${req.method} Not Allowed`);
+    }
+}

pages/dash.tsx

@@ -204,6 +204,7 @@ export const getServerSideProps = async (context) => {
         props: {
             initialItems: items,
             userId: session?.user.id,
+            // messages: (await import(`../content/i18n/${context.locale}.json`)).default
         },
     };
 }