/** Checkout guard (cart & checkout validation function) lookup, shared by Settings and the Today setup guide. */
export const GUARD_HANDLE = "datewise-checkout-guard";

export type AdminGraphql = { graphql: (q: string, o?: { variables?: Record<string, unknown> }) => Promise<Response> };

export async function gql<T>(admin: AdminGraphql, q: string, variables?: Record<string, unknown>) {
  const r = await admin.graphql(q, { variables });
  return ((await r.json()) as { data: T }).data;
}

export async function findGuard(admin: AdminGraphql) {
  const d = await gql<{
    shopifyFunctions: { nodes: { id: string; title: string; apiType: string }[] };
    validations: { nodes: { id: string; enabled: boolean; shopifyFunction: { id: string } }[] };
  }>(admin, `#graphql
    query {
      shopifyFunctions(first: 50) { nodes { id title apiType } }
      validations(first: 25) { nodes { id enabled shopifyFunction { id } } }
    }`);
  const fn = d.shopifyFunctions.nodes.find((f) => f.title === GUARD_HANDLE || /datewise/i.test(f.title));
  const validation = fn ? d.validations.nodes.find((v) => v.shopifyFunction.id === fn.id) : undefined;
  return { fn, validation };
}