(trigger, receipt) => {
    const PENDING_KEY = "__labs3daiFallbackPending";
    const ALLOWED_PARENTS = __LABS_EMBED_PARENTS__;
    const ticket = receipt && typeof receipt === "object" ? receipt.ticket : null;
    const parentOrigin = new URLSearchParams(location.search).get("__labs_parent");
    const ack = extra => Object.assign({ticket: ticket}, extra);
    const skip = reason => [ack({no_fallback: true, reason: reason}), receipt];
    if (window.parent === window) return skip("no_parent_frame");
    if (!ALLOWED_PARENTS.includes(parentOrigin)) return skip("parent_not_allowed");
    if (typeof ticket !== "string" || !ticket || ticket.length > 4096) return skip("no_ticket");
    const pending = (window[PENDING_KEY] = window[PENDING_KEY] || new Map());
    if (pending.has(ticket)) return pending.get(ticket);
    const requestId = typeof crypto.randomUUID === "function"
        ? crypto.randomUUID()
        : `${Date.now().toString(16)}-${Math.random().toString(16).slice(2)}`;
    const imageInput = document.querySelector('input[type="file"]');
    const promise = new Promise(resolve => {
        let settled = false;
        const settle = ackValue => {
            if (settled) return;
            settled = true;
            clearTimeout(timer);
            window.removeEventListener("message", receive);
            window.removeEventListener("pagehide", cancel);
            imageInput?.removeEventListener("change", cancel);
            document.removeEventListener("click", onClear, true);
            pending.delete(ticket);
            resolve([ackValue, receipt]);
        };
        const cancel = () => settle(ack({cancelled: true}));
        const onClear = event => {
            if (event.target.closest?.('button[aria-label="Remove Image"], button[aria-label="Clear"], table[role="grid"] tbody tr')) cancel();
        };
        const receive = event => {
            if (event.source !== window.parent || event.origin !== parentOrigin) return;
            const data = event.data;
            if (!data || data.type !== "labs:3dai-result" || data.requestId !== requestId) return;
            if (data.cancelled) return cancel();
            if (data.error) return settle(ack({error: String(data.error)}));
            if (data.ready === true) return settle(ack({ready: true}));
        };
        const timer = setTimeout(cancel, 120000);
        window.addEventListener("message", receive);
        window.addEventListener("pagehide", cancel, {once: true});
        imageInput?.addEventListener("change", cancel, {once: true});
        document.addEventListener("click", onClear, true);
        window.parent.postMessage({type: "labs:3dai-fallback", requestId, ticket}, parentOrigin);
    });
    pending.set(ticket, promise);
    return promise;
}