From d7f3a47f40898d8ab4b341c32df4b472ea8170b9 Mon Sep 17 00:00:00 2001
From: Mattia Simonato <mattiasimonato.w@gmail.com>
Date: Wed, 22 May 2024 08:03:09 +0200
Subject: [PATCH] feat(SLB-277): use Headless UI for creating new
 LanguageSwitcher.tsx

---
 .../components/Molecules/LanguageSwitcher.tsx | 100 ++++++++++++++----
 1 file changed, 81 insertions(+), 19 deletions(-)

diff --git a/packages/ui/src/components/Molecules/LanguageSwitcher.tsx b/packages/ui/src/components/Molecules/LanguageSwitcher.tsx
index 234c27439..5684fef3f 100644
--- a/packages/ui/src/components/Molecules/LanguageSwitcher.tsx
+++ b/packages/ui/src/components/Molecules/LanguageSwitcher.tsx
@@ -1,30 +1,92 @@
 import { Link, Locale, useLocation } from '@custom/schema';
+import { Menu, Transition } from '@headlessui/react';
+import { ChevronDownIcon } from '@heroicons/react/20/solid';
 import clsx from 'clsx';
-import React from 'react';
+import React, { Fragment } from 'react';
 
 import { useTranslations } from '../../utils/translations';
 
+function getLanguageName(locale: string) {
+  const languageNames = new Intl.DisplayNames([locale], {
+    type: 'language',
+  });
+  return languageNames.of(locale);
+}
+
 export function LanguageSwitcher() {
   const translations = useTranslations();
   const [location] = useLocation();
+  const currentLocale = Object.values(Locale).find((locale) => {
+    const translationPath = translations[locale];
+    return location.pathname.includes(translationPath || '');
+  });
+
+  if (!currentLocale) {
+    console.error(
+      'No matching locale found in current path:',
+      location.pathname,
+    );
+    return null;
+  }
+
+  const otherLocales = Object.values(Locale).filter(
+    (locale) => locale !== currentLocale,
+  );
+
   return (
-    <ul className="flex gap-2 uppercase">
-      {Object.values(Locale).map((locale) => (
-        <li key={locale}>
-          {translations[locale] ? (
-            <Link
-              href={translations[locale]!}
-              className={clsx('text-gray-500', {
-                underline: location.pathname !== translations[locale],
-              })}
-            >
-              {locale}
-            </Link>
-          ) : (
-            <span className="text-gray-400">{locale}</span>
-          )}
-        </li>
-      ))}
-    </ul>
+    <div className="relative inline-block text-left">
+      <Menu as="div" className="relative inline-block text-left">
+        <div>
+          <Menu.Button className="inline-flex justify-center w-full rounded-md bg-white text-sm">
+            {getLanguageName(currentLocale as string)}
+            <ChevronDownIcon
+              className="-mr-1 ml-2 h-5 w-5"
+              aria-hidden="true"
+            />
+          </Menu.Button>
+        </div>
+
+        <Transition
+          as={Fragment}
+          enter="transition ease-out duration-100"
+          enterFrom="transform opacity-0 scale-95"
+          enterTo="transform opacity-100 scale-100"
+          leave="transition ease-in duration-75"
+          leaveFrom="transform opacity-100 scale-100"
+          leaveTo="transform opacity-0 scale-95"
+        >
+          <Menu.Items className="origin-top-right absolute right-0 mt-2 w-48 border border-gray-300 rounded-md shadow-lg bg-white">
+            <div className="py-1">
+              {otherLocales.map((locale) => (
+                <Menu.Item key={locale}>
+                  {({ focus }) =>
+                    translations[locale] ? (
+                      <Link
+                        href={translations[locale]!}
+                        className={clsx(
+                          focus ? 'bg-gray-100 text-gray-900' : 'text-gray-700',
+                          'block px-4 py-2 text-sm',
+                        )}
+                      >
+                        {getLanguageName(locale as string)}
+                      </Link>
+                    ) : (
+                      <span
+                        className={clsx(
+                          focus ? 'bg-gray-100 text-gray-900' : 'text-gray-700',
+                          'block px-4 py-2 text-sm',
+                        )}
+                      >
+                        {getLanguageName(locale as string)}
+                      </span>
+                    )
+                  }
+                </Menu.Item>
+              ))}
+            </div>
+          </Menu.Items>
+        </Transition>
+      </Menu>
+    </div>
   );
 }