"use client";

import Link from "next/link";

type PaginationProps = {
  page: number;
  pageSize: number;
  total: number;
  basePath: string;
};

function pageHref(basePath: string, page: number) {
  if (page <= 1) return basePath;
  return `${basePath}?page=${page}`;
}

export function Pagination({
  page,
  pageSize,
  total,
  basePath,
}: PaginationProps) {
  const totalPages = Math.max(1, Math.ceil(total / pageSize));

  if (totalPages <= 1) return null;

  const windowSize = 5;
  let start = Math.max(1, page - Math.floor(windowSize / 2));
  const end = Math.min(totalPages, start + windowSize - 1);
  start = Math.max(1, end - windowSize + 1);

  const pages = Array.from({ length: end - start + 1 }, (_, i) => start + i);

  const scrollTop = () => {
    window.scrollTo({ top: 0, behavior: "smooth" });
  };

  return (
    <nav
      className="mt-14 flex flex-wrap items-center justify-center gap-2"
      aria-label="صفحه‌بندی"
    >
      {page > 1 ? (
        <Link
          href={pageHref(basePath, page - 1)}
          onClick={scrollTop}
          scroll
          className="rounded-full border border-line/70 px-4 py-2 text-sm text-ink-soft transition hover:border-ink/30 hover:text-ink"
        >
          قبلی
        </Link>
      ) : (
        <span className="rounded-full border border-line/40 px-4 py-2 text-sm text-muted/40">
          قبلی
        </span>
      )}

      {start > 1 ? (
        <>
          <Link
            href={pageHref(basePath, 1)}
            onClick={scrollTop}
            scroll
            className="rounded-full border border-line/70 px-3.5 py-2 text-sm text-ink-soft transition hover:border-ink/30 hover:text-ink"
          >
            ۱
          </Link>
          {start > 2 ? (
            <span className="px-1 text-muted" aria-hidden>
              …
            </span>
          ) : null}
        </>
      ) : null}

      {pages.map((n) => (
        <Link
          key={n}
          href={pageHref(basePath, n)}
          onClick={scrollTop}
          scroll
          aria-current={n === page ? "page" : undefined}
          className={`rounded-full border px-3.5 py-2 text-sm transition ${
            n === page
              ? "border-ink bg-ink text-surface"
              : "border-line/70 text-ink-soft hover:border-ink/30 hover:text-ink"
          }`}
        >
          {n.toLocaleString("fa-IR")}
        </Link>
      ))}

      {end < totalPages ? (
        <>
          {end < totalPages - 1 ? (
            <span className="px-1 text-muted" aria-hidden>
              …
            </span>
          ) : null}
          <Link
            href={pageHref(basePath, totalPages)}
            onClick={scrollTop}
            scroll
            className="rounded-full border border-line/70 px-3.5 py-2 text-sm text-ink-soft transition hover:border-ink/30 hover:text-ink"
          >
            {totalPages.toLocaleString("fa-IR")}
          </Link>
        </>
      ) : null}

      {page < totalPages ? (
        <Link
          href={pageHref(basePath, page + 1)}
          onClick={scrollTop}
          scroll
          className="rounded-full border border-line/70 px-4 py-2 text-sm text-ink-soft transition hover:border-ink/30 hover:text-ink"
        >
          بعدی
        </Link>
      ) : (
        <span className="rounded-full border border-line/40 px-4 py-2 text-sm text-muted/40">
          بعدی
        </span>
      )}
    </nav>
  );
}