import type { GroceryExportPayload } from "@/lib/grocery-export";

/**
 * Stub adapter for the Instacart "Recipe & Shopping List" partner API.
 *
 * Not wired to a live endpoint — Instacart requires a signed partnership
 * agreement and a per-integration API key before any request can succeed.
 * This documents the request shape so activation is a config change, not a
 * rewrite, once `INSTACART_API_KEY` is issued.
 *
 * Real endpoint (per Instacart Developer Platform docs, subject to change):
 *   POST https://connect.instacart.com/idp/v1/products/products_link
 *   Authorization: Bearer <INSTACART_API_KEY>
 *   Body: { title: string, link_type: "shopping_list", line_items: [{ name, quantity, unit }] }
 * Response contains a `products_link_url` the user is redirected to.
 */
export async function createInstacartShoppingListLink(
  payload: GroceryExportPayload
): Promise<{ url: string } | null> {
  const apiKey = process.env["INSTACART_API_KEY"];
  if (!apiKey) return null;

  throw new Error(
    "Instacart integration is stubbed — INSTACART_API_KEY is set but no live API call is wired up yet. " +
      `Would send list "${payload.listName}" with ${payload.items.length} item(s).`
  );
}
