"use client";

import { useEffect, useMemo, useState } from "react";
import Link from "next/link";
import { useRouter } from "next/navigation";

type Language = { id: string; name: string };
type Paged<T> = { items: T[]; page: number; pageSize: number; total: number };

export default function LanguagesSearch({ initial, initialQ }: { initial?: Paged<Language>; initialQ?: string }) {
  const router = useRouter();
  const [q, setQ] = useState(initialQ ?? "");
  const [data, setData] = useState<Paged<Language> | null>(initial ?? null);
  const totalPages = useMemo(() => (data ? Math.max(1, Math.ceil(data.total / data.pageSize)) : 1), [data]);

  useEffect(() => {
    if (initial) setData(initial);
  }, [initial]);

  useEffect(() => {
    setQ(initialQ ?? "");
  }, [initialQ]);

  function submit(e: React.FormEvent) {
    e.preventDefault();
    const params = new URLSearchParams();
    if (q) params.set("q", q);
    params.set("page", "1");
    router.push(`/zxdb/languages?${params.toString()}`);
  }

  return (
    <div>
      <h1>Languages</h1>
      <form className="row gy-2 gx-2 align-items-center" onSubmit={submit}>
        <div className="col-sm-8 col-md-6 col-lg-4">
          <input className="form-control" placeholder="Search languages…" value={q} onChange={(e) => setQ(e.target.value)} />
        </div>
        <div className="col-auto">
          <button className="btn btn-primary">Search</button>
        </div>
      </form>

      <div className="mt-3">
        {data && data.items.length === 0 && <div className="alert alert-warning">No languages found.</div>}
        {data && data.items.length > 0 && (
          <div className="table-responsive">
            <table className="table table-striped table-hover align-middle">
              <thead>
                <tr>
                  <th style={{ width: 120 }}>Code</th>
                  <th>Name</th>
                </tr>
              </thead>
              <tbody>
                {data.items.map((l) => (
                  <tr key={l.id}>
                    <td><span className="badge text-bg-light">{l.id}</span></td>
                    <td>
                      <Link href={`/zxdb/languages/${l.id}`}>{l.name}</Link>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </div>

      <div className="d-flex align-items-center gap-2 mt-2">
        <span>Page {data?.page ?? 1} / {totalPages}</span>
        <div className="ms-auto d-flex gap-2">
          <Link
            className={`btn btn-outline-secondary ${!data || (data.page <= 1) ? "disabled" : ""}`}
            aria-disabled={!data || data.page <= 1}
            href={`/zxdb/languages?${(() => { const p = new URLSearchParams(); if (q) p.set("q", q); p.set("page", String(Math.max(1, (data?.page ?? 1) - 1))); return p.toString(); })()}`}
          >
            Prev
          </Link>
          <Link
            className={`btn btn-outline-secondary ${!data || (data.page >= totalPages) ? "disabled" : ""}`}
            aria-disabled={!data || data.page >= totalPages}
            href={`/zxdb/languages?${(() => { const p = new URLSearchParams(); if (q) p.set("q", q); p.set("page", String(Math.min(totalPages, (data?.page ?? 1) + 1))); return p.toString(); })()}`}
          >
            Next
          </Link>
        </div>
      </div>
    </div>
  );
}