import type { Method } from "@prisma/client";
import db from "../db.server";
import { slotDateTime } from "../lib/time";
import { releaseHold } from "./holds.server";

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

export interface OrderNoteAttribute {
  name: string;
  value: string;
}

export interface OrderWebhookPayload {
  admin_graphql_api_id: string;
  name?: string;
  cart_token?: string | null;
  email?: string | null;
  phone?: string | null;
  note_attributes?: OrderNoteAttribute[];
}

function readAttr(attrs: OrderNoteAttribute[], key: string): string | undefined {
  return attrs.find((a) => a.name === key)?.value;
}

/**
 * Converts a completed order's dd_* cart attributes (written by the
 * storefront widget, see extensions/datetime-widget) into a confirmed
 * Booking, and releases the Redis hold that reserved its capacity.
 *
 * Idempotent on orderId — webhooks can and do redeliver, so this must be
 * safe to run twice for the same order without double-booking capacity.
 *
 * Deliberately does NOT re-check capacity here and reject the order if
 * over budget: by the time an order exists, payment has been taken and the
 * Validation Function already had its chance to block checkout with a
 * fresh capacity snapshot. This function's job is to record what happened,
 * not to re-litigate it.
 */
export async function createBookingFromOrder(shopDomain: string, order: OrderWebhookPayload): Promise<void> {
  const attrs = order.note_attributes ?? [];
  const method = readAttr(attrs, "dd_method");
  const date = readAttr(attrs, "dd_date");
  const startMinRaw = readAttr(attrs, "dd_start_min");
  const endMinRaw = readAttr(attrs, "dd_end_min");
  const locationId = readAttr(attrs, "dd_location_id");

  if (!method || !VALID_METHODS.has(method as Method) || !date || !startMinRaw || !endMinRaw || !locationId) {
    return; // no scheduling selection on this order — nothing to book
  }

  const location = await db.location.findFirst({ where: { id: locationId, shopDomain } });
  if (!location) return;

  const startMin = Number(startMinRaw);
  const endMin = Number(endMinRaw);
  const slotStart = slotDateTime(date, startMin, location.timezone);
  const slotEnd = slotDateTime(date, endMin, location.timezone);

  await db.booking.upsert({
    where: { orderId: order.admin_graphql_api_id },
    create: {
      shopDomain,
      orderId: order.admin_graphql_api_id,
      orderName: order.name,
      locationId: location.id,
      method: method as Method,
      slotStart: slotStart.toJSDate(),
      slotEnd: slotEnd.toJSDate(),
      customerEmail: order.email ?? undefined,
      customerPhone: order.phone ?? undefined,
    },
    update: {}, // redelivered webhook — the booking already exists, nothing to change
  });

  if (order.cart_token) {
    await releaseHold(
      {
        shopDomain,
        locationId: location.id,
        method: method as Method,
        slotStartIso: slotStart.toUTC().toISO()!,
      },
      order.cart_token,
    );
  }
}