CCM-11148 Update feature flags on auth status change

Author: nicki-nhs

frontend/src/components/molecules/Header/HeaderNavigation.tsx

@@ -1,20 +1,49 @@
 'use client';
 
+import { useEffect, useRef, useState } from 'react';
 import type { AuthStatus } from '@aws-amplify/ui';
 import Link from 'next/link';
 import content from '@content/content';
 import { useAuthStatus } from '@hooks/use-auth-status';
+import { fetchAuthSession } from 'aws-amplify/auth';
+import { clientConfigurationApiClient } from 'nhs-notify-backend-client';
 
 const headerContent = content.components.header;
 
 export function HeaderNavigation({
   initialAuthStatus,
-  routingEnabled,
+  routingEnabled: initialRoutingEnabled = false,
 }: {
   initialAuthStatus: AuthStatus;
   routingEnabled?: boolean;
 }) {
   const authStatus = useAuthStatus(initialAuthStatus);
+  const prevStatus = useRef(initialAuthStatus);
+  const [routingEnabled, setRoutingEnabled] = useState(initialRoutingEnabled);
+
+  useEffect(() => {
+    if (authStatus === prevStatus.current) return;
+
+    prevStatus.current = authStatus;
+
+    if (authStatus !== 'authenticated') {
+      setRoutingEnabled(false);
+      return;
+    }
+
+    (async () => {
+      try {
+        const session = await fetchAuthSession();
+        const token = session.tokens?.accessToken?.toString();
+        if (!token) return;
+
+        const result = await clientConfigurationApiClient.fetch(token);
+        setRoutingEnabled(result.data?.features?.routing ?? false);
+      } catch {
+        setRoutingEnabled(false);
+      }
+    })();
+  }, [authStatus]);
 
   return (
     <>