feat: paginate chat history (#903)

app/(chat)/api/history/route.ts

@@ -1,14 +1,37 @@
 import { auth } from '@/app/(auth)/auth';
+import { NextRequest } from 'next/server';
 import { getChatsByUserId } from '@/lib/db/queries';
 
-export async function GET() {
+export async function GET(request: NextRequest) {
+  const { searchParams } = request.nextUrl;
+
+  const limit = parseInt(searchParams.get('limit') || '10');
+  const startingAfter = searchParams.get('starting_after');
+  const endingBefore = searchParams.get('ending_before');
+
+  if (startingAfter && endingBefore) {
+    return Response.json(
+      'Only one of starting_after or ending_before can be provided!',
+      { status: 400 },
+    );
+  }
+
   const session = await auth();
 
-  if (!session || !session.user) {
+  if (!session?.user?.id) {
     return Response.json('Unauthorized!', { status: 401 });
   }
 
-  // biome-ignore lint: Forbidden non-null assertion.
-  const chats = await getChatsByUserId({ id: session.user.id! });
-  return Response.json(chats);
+  try {
+    const chats = await getChatsByUserId({
+      id: session.user.id,
+      limit,
+      startingAfter,
+      endingBefore,
+    });
+
+    return Response.json(chats);
+  } catch (_) {
+    return Response.json('Failed to fetch chats!', { status: 500 });
+  }
 }