// Shared parsing for the ProductRule-scoping params every scheduling route
// (storefront + POS, availability + hold) accepts identically — kept here so
// the four call sites don't each re-implement the same defensive JSON parsing.

export interface CartLineParam {
  vendor?: string;
  productType?: string;
}

/** `cartLines` is a JSON-encoded array; malformed/missing input degrades to "no cart info" rather than erroring the request. */
export function parseCartLinesParam(raw: string | null | undefined): CartLineParam[] {
  if (!raw) return [];
  try {
    const parsed = JSON.parse(raw);
    if (!Array.isArray(parsed)) return [];
    return parsed
      .filter((entry): entry is Record<string, unknown> => typeof entry === "object" && entry !== null)
      .map((entry) => ({
        vendor: typeof entry.vendor === "string" ? entry.vendor : undefined,
        productType: typeof entry.productType === "string" ? entry.productType : undefined,
      }));
  } catch {
    return [];
  }
}

/** `productIds` is a comma-separated list of Shopify Product GIDs. */
export function parseProductIdsParam(raw: string | null | undefined): string[] {
  return parseGidListParam(raw);
}

/** Generic comma-separated Shopify GID list (products, variants, …). */
export function parseGidListParam(raw: string | null | undefined): string[] {
  if (!raw) return [];
  return raw
    .split(",")
    .map((id) => id.trim())
    .filter(Boolean);
}