import type { FormWithSubmissionCount } from "../../services/api/types";

export function formEventId(f: FormWithSubmissionCount): string | null {
  const ev = f.event;
  if (!ev) return null;
  if (typeof ev === "string") return ev.trim().length === 24 ? ev.trim() : null;
  const id = (ev as { _id?: string })._id;
  return id && String(id).trim().length === 24 ? String(id).trim() : null;
}

export function publicFormPageUrl(
  f: FormWithSubmissionCount,
  fallbackEventId?: string | null,
): string {
  const base =
    (typeof import.meta.env.VITE_PUBLIC_WEB_BASE === "string" && import.meta.env.VITE_PUBLIC_WEB_BASE.trim()) ||
    window.location.origin.replace(/\/$/, "");
  const eventId = formEventId(f) ?? fallbackEventId ?? null;
  const fid = f._id;
  if (eventId) return `${base.replace(/\/$/, "")}/event/${eventId}/form/${fid}`;
  return `${base.replace(/\/$/, "")}/form/${fid}`;
}