salar-store/app/products/[id]/page.tsx

import { notFound, permanentRedirect } from "next/navigation";
import { getCategoryById, getCategoryBySlug, getProduct, getProductById } from "@/lib/api";
import { categoryHref, productHref } from "@/lib/paths";

/** Legacy `/products/{id-or-slug}` → canonical product or category URL. */
export default async function LegacyProductOrCategoryRedirect({
  params,
}: {
  params: Promise<{ id: string }>;
}) {
  const { id } = await params;

  const productById = await getProductById(id);
  if (productById) permanentRedirect(productHref(productById));

  const productBySlug = await getProduct(id);
  if (productBySlug) permanentRedirect(productHref(productBySlug));

  const categoryById = await getCategoryById(id);
  if (categoryById) permanentRedirect(categoryHref(categoryById));

  const categoryBySlug = await getCategoryBySlug(id);
  if (categoryBySlug) permanentRedirect(categoryHref(categoryBySlug));

  notFound();
}