"use client";

import Link from "next/link";
import { ChevronLeft, ChevronRight } from "lucide-react";

interface PaginationProps {
  total: number;
  page: number;
  size: number;
  basePath: string;
  query?: Record<string, string>;
  onChange?: (page: number) => void;
}

export default function Pagination({ total, page, size, basePath, query = {}, onChange }: PaginationProps) {
  const totalPages = Math.max(1, Math.ceil(total / size));
  if (totalPages <= 1) return null;

  const buildHref = (p: number) => {
    const params = new URLSearchParams(query);
    params.set("page", String(p));
    return `${basePath}?${params.toString()}`;
  };

  const handleClick = (p: number, e: React.MouseEvent) => {
    if (onChange) {
      e.preventDefault();
      onChange(p);
    }
  };

  const pages: (number | "...")[] = [];
  const add = (p: number | "...") => pages.push(p);

  if (totalPages <= 7) {
    for (let i = 1; i <= totalPages; i++) add(i);
  } else {
    add(1);
    if (page > 4) add("...");
    const start = Math.max(2, page - 1);
    const end = Math.min(totalPages - 1, page + 1);
    for (let i = start; i <= end; i++) add(i);
    if (page < totalPages - 3) add("...");
    add(totalPages);
  }

  const cls =
    "pager-btn min-w-[38px] h-9 px-1 flex items-center justify-center font-semibold text-[13px] rounded-full border transition-colors duration-150";

  return (
    <nav className="flex items-center justify-center gap-1.5 mt-10 flex-wrap" aria-label="分页">
      {page > 1 && (
        <Link
          href={buildHref(page - 1)}
          onClick={(e) => handleClick(page - 1, e)}
          className={`${cls} px-3 gap-1`}
        >
          <ChevronLeft size={14} /> 上一页
        </Link>
      )}

      {pages.map((p, i) =>
        p === "..." ? (
          <span key={`e${i}`} className="px-1 meta">
            —
          </span>
        ) : (
          <Link
            key={p}
            href={buildHref(p)}
            onClick={(e) => handleClick(p, e)}
            aria-current={p === page ? "page" : undefined}
            className={`${cls} ${p === page ? "is-current" : ""}`}
          >
            {p}
          </Link>
        )
      )}

      {page < totalPages && (
        <Link
          href={buildHref(page + 1)}
          onClick={(e) => handleClick(page + 1, e)}
          className={`${cls} px-3 gap-1`}
        >
          下一页 <ChevronRight size={14} />
        </Link>
      )}
    </nav>
  );
}