feat(lang): add language switcher on the landing page, in the footer

client/components/shared/LanguageSwitcher.tsx

@@ -0,0 +1,71 @@
+import { Language } from '@mui/icons-material';
+import { IconButton, Popover } from '@mui/material';
+import dayjs from 'dayjs';
+import { useRouter } from 'next/router';
+import { MouseEvent, useState } from 'react';
+
+import { languages } from '@/config/languages';
+import { setLanguage } from '@/store/build/buildSlice';
+import { useAppDispatch } from '@/store/hooks';
+
+import styles from './LanguageSwitcher.module.scss';
+
+const LanguageSwitcher = () => {
+  const router = useRouter();
+
+  const dispatch = useAppDispatch();
+
+  const [anchorEl, setAnchorEl] = useState<HTMLButtonElement | null>(null);
+
+  const handleClick = (event: MouseEvent<HTMLButtonElement>) => setAnchorEl(event.currentTarget);
+
+  const handleClose = () => setAnchorEl(null);
+
+  const handleChangeLanguage = (locale: string) => {
+    const { pathname, asPath, query } = router;
+
+    dayjs.locale(locale);
+    dispatch(setLanguage({ language: locale }));
+    document.cookie = `NEXT_LOCALE=${locale}; path=/; expires=2147483647`;
+
+    router.push({ pathname, query }, asPath, { locale });
+  };
+
+  return (
+    <div>
+      <IconButton onClick={handleClick}>
+        <Language />
+      </IconButton>
+
+      <Popover
+        anchorEl={anchorEl}
+        open={Boolean(anchorEl)}
+        onClose={handleClose}
+        anchorOrigin={{
+          vertical: 'top',
+          horizontal: 'right',
+        }}
+        transformOrigin={{
+          vertical: 'bottom',
+          horizontal: 'right',
+        }}
+      >
+        <div className={styles.popover}>
+          <div className={styles.container}>
+            {languages.map(({ code, name, localName }) => (
+              <p key={code} className={styles.language} onClick={() => handleChangeLanguage(code)}>
+                {name} {localName && `(${localName})`}
+              </p>
+            ))}
+
+            <a href="https://translate.rxresu.me" target="_blank" rel="noreferrer" className={styles.language}>
+              Missing your language?
+            </a>
+          </div>
+        </div>
+      </Popover>
+    </div>
+  );
+};
+
+export default LanguageSwitcher;