Submatter/apps/web/app/page.tsx

import { redirect } from "next/navigation";
import { asc, eq } from "drizzle-orm";

import { auth } from "@/lib/auth";
import { db } from "@tasks/database/client";
import { workspaceMembers, workspaces } from "@tasks/database/schema";

/**
 * Root landing route. Unauthenticated visitors go to the public marketing site;
 * signed-in users land on their oldest workspace home (`/{slug}/`).
 */
export default async function HomePage() {
  const session = await auth();

  if (!session?.user?.id) {
    redirect("/landing");
  }

  const [membership] = await db
    .select({ slug: workspaces.slug })
    .from(workspaceMembers)
    .innerJoin(workspaces, eq(workspaces.id, workspaceMembers.workspaceId))
    .where(eq(workspaceMembers.userId, session.user.id))
    .orderBy(asc(workspaceMembers.createdAt))
    .limit(1);

  if (membership?.slug) {
    redirect(`/${membership.slug}`);
  }

  redirect("/sign-in?error=no_workspace");
}