"use client";

import { usePathname, useRouter, useSearchParams } from "next/navigation";
import { useCallback, useMemo } from "react";

/** URL search params as state: `set({ key: value | null })` replaces the URL (no scroll, no history entry). */
export function useUrlState(): [Record<string, string>, (patch: Record<string, string | number | boolean | null | undefined>, opts?: { push?: boolean }) => void] {
  const sp = useSearchParams();
  const router = useRouter();
  const pathname = usePathname();
  const params = useMemo(() => {
    const out: Record<string, string> = {};
    sp.forEach((v, k) => {
      out[k] = v;
    });
    return out;
  }, [sp]);
  const set = useCallback(
    (patch: Record<string, string | number | boolean | null | undefined>, opts?: { push?: boolean }) => {
      const next = new URLSearchParams(sp.toString());
      for (const [k, v] of Object.entries(patch)) {
        if (v === null || v === undefined || v === "" || v === false) next.delete(k);
        else next.set(k, v === true ? "1" : String(v));
      }
      const qs = next.toString();
      const url = qs ? `${pathname}?${qs}` : pathname;
      if (opts?.push) router.push(url, { scroll: false });
      else router.replace(url, { scroll: false });
    },
    [sp, router, pathname],
  );
  return [params, set];
}