import { createHash } from "node:crypto";

export interface FilterInput {
  locations: unknown;
  keywords: unknown;
  toggles: unknown;
  cap: number;
}

function stableStringify(v: unknown): string {
  if (v === null || typeof v !== "object") return JSON.stringify(v);
  if (Array.isArray(v)) return `[${v.map(stableStringify).join(",")}]`;
  const keys = Object.keys(v as Record<string, unknown>).sort();
  return `{${keys.map((k) => JSON.stringify(k) + ":" + stableStringify((v as Record<string, unknown>)[k])).join(",")}}`;
}

export function filterHash(input: FilterInput): string {
  return createHash("sha1").update(stableStringify(input)).digest("hex");
}

export function sha1(s: string): string {
  return createHash("sha1").update(s).digest("hex");
}