import type { BookingStatus, PaymentStatus, Prisma } from "@/generated/prisma/client";

const BOOKING_STATUSES: BookingStatus[] = ["PENDING", "CONFIRMED", "CANCELED", "EXPIRED", "NEEDS_REVIEW"];
const PAYMENT_STATUSES: PaymentStatus[] = ["UNPAID", "PROCESSING", "PARTIALLY_PAID", "PAID", "FAILED", "PARTIALLY_REFUNDED", "REFUNDED"];

export type BookingFilter = { status?: BookingStatus; zahlung?: PaymentStatus; modus: "test" | "live"; q?: string };

/** Liest Filter aus der URL; Unbekanntes wird ignoriert statt uebernommen. */
export function parseBookingFilter(params: Record<string, string | string[] | undefined>, defaultMode: "test" | "live"): BookingFilter {
  const get = (k: string) => (typeof params[k] === "string" ? (params[k] as string) : undefined);
  const status = get("status");
  const zahlung = get("zahlung");
  const modus = get("modus");
  const q = get("q")?.trim().slice(0, 100);
  return {
    status: BOOKING_STATUSES.includes(status as BookingStatus) ? (status as BookingStatus) : undefined,
    zahlung: PAYMENT_STATUSES.includes(zahlung as PaymentStatus) ? (zahlung as PaymentStatus) : undefined,
    modus: modus === "live" || modus === "test" ? modus : defaultMode,
    q: q || undefined,
  };
}

export function bookingWhere(filter: BookingFilter): Prisma.BookingWhereInput {
  return {
    livemode: filter.modus === "live",
    ...(filter.status ? { status: filter.status } : {}),
    ...(filter.zahlung ? { paymentStatus: filter.zahlung } : {}),
    ...(filter.q
      ? {
          OR: [
            { reference: { contains: filter.q, mode: "insensitive" } },
            { email: { contains: filter.q, mode: "insensitive" } },
            { lastName: { contains: filter.q, mode: "insensitive" } },
            { firstName: { contains: filter.q, mode: "insensitive" } },
          ],
        }
      : {}),
  };
}

export function filterQuery(filter: BookingFilter): string {
  const params = new URLSearchParams();
  params.set("modus", filter.modus);
  if (filter.status) params.set("status", filter.status);
  if (filter.zahlung) params.set("zahlung", filter.zahlung);
  if (filter.q) params.set("q", filter.q);
  return params.toString();
}

/** Schutz vor Formel-Injektion: Zellen, die mit = + - @ beginnen, werden entschaerft. */
export function csvCell(value: string | number | null | undefined): string {
  let s = value === null || value === undefined ? "" : String(value);
  if (/^[=+\-@\t\r]/.test(s)) s = `'${s}`;
  return `"${s.replace(/"/g, '""')}"`;
}

export { BOOKING_STATUSES, PAYMENT_STATUSES };