skills/wix-headless-templates/donations/project/src/wix/donations/receipt-store.ts

// The thank-you page's order read as a framework-free store — the logic behind useDonationReceipt.
// Landing on the thank-you URL is Wix's success redirect (it is reached only after the hosted
// checkout completes); the order itself may or may not be readable with the visitor's token, so
// `receipt` null with `loading` false is a normal outcome, not an error — the page thanks the donor
// without order facts. One store per page: createReceiptStore(orderId).
import { fetchDonationReceipt } from "./donate";
import { orderIdFromSearch } from "./donations-core";
import type { DonationReceipt } from "./types";

export interface ReceiptState {
  /** The order id from the URL ("" on a direct visit with no order). */
  orderId: string;
  /** True while the order read is in flight. */
  loading: boolean;
  /** The order's facts; null when there was no order id or the order couldn't be read. */
  receipt: DonationReceipt | null;
}

export interface ReceiptStore {
  getState(): ReceiptState;
  subscribe(listener: () => void): () => void;
  /** Read the order once (a browser). */
  start(): void;
  stop(): void;
}

/** `orderId` omitted → read from the current URL (`?orderId=` or `?orderid=`). */
export function createReceiptStore(orderId?: string): ReceiptStore {
  const id = orderId ?? (typeof window !== "undefined" ? orderIdFromSearch(window.location.search) : "");
  let state: ReceiptState = { orderId: id, loading: !!id, receipt: null };
  let started = false;
  const listeners = new Set<() => void>();

  function setState(patch: Partial<ReceiptState>): void {
    state = { ...state, ...patch };
    for (const fn of listeners) fn();
  }

  return {
    getState: () => state,
    subscribe(fn) {
      listeners.add(fn);
      return () => listeners.delete(fn);
    },
    start() {
      if (started) return;
      started = true;
      if (!id) return;
      fetchDonationReceipt(id).then((receipt) => { if (started) setState({ receipt, loading: false }); });
    },
    stop() {
      started = false;
    },
  };
}