import type { ActionFunctionArgs } from "@remix-run/node";
import type { Method } from "@prisma/client";
import { authenticate } from "../shopify.server";
import { resolveHoldRequest } from "../services/hold-request.server";

// POS UI Extension endpoint — see pos.scheduling.availability.tsx for the
// session-token/CORS rationale. Calls the exact same resolveHoldRequest()
// as the storefront's apps.scheduling.hold.tsx, so a staff-booked slot and
// a shopper-booked slot compete for the same Redis-backed capacity — a POS
// order can't double-book a slot an online shopper already holds, or vice
// versa (IMPLEMENTATION_PLAN.md Phase 7 accept criteria).

const VALID_METHODS = new Set<Method>(["SHIPPING", "LOCAL_DELIVERY", "PICKUP"]);

export const action = async ({ request }: ActionFunctionArgs) => {
  const { sessionToken, cors } = await authenticate.public.pos(request);
  const shopDomain = sessionToken.dest.replace(/^https?:\/\//, "");

  const body = await request.json();
  const { intent, locationId, method, date, startMin, cartToken } = body as {
    intent?: "create" | "release";
    locationId?: string;
    method?: string;
    date?: string;
    startMin?: number;
    cartToken?: string;
  };

  if (!locationId || !method || !VALID_METHODS.has(method as Method) || !date || typeof startMin !== "number" || !cartToken) {
    return cors(Response.json({ error: "Missing or invalid parameters" }, { status: 400 }));
  }

  const result = await resolveHoldRequest(shopDomain, {
    intent: intent === "release" ? "release" : "create",
    locationId,
    method: method as Method,
    date,
    startMin,
    cartToken,
  });

  return cors(Response.json(result.body, { status: result.status }));
};