"use client";

import Link from "next/link";
import { useDeferredValue, useMemo, useState } from "react";
import type { FacilityRecord } from "@/app/facilityData";

type SortKey = "name" | "ngf_number" | "county";

type ClubNumbersTableProps = {
  facilities: FacilityRecord[];
};

function normalizeComparable(value: string | number | null | undefined) {
  return String(value ?? "").trim().toLowerCase();
}

export default function ClubNumbersTable({ facilities }: ClubNumbersTableProps) {
  const [query, setQuery] = useState("");
  const [sortKey, setSortKey] = useState<SortKey>("name");
  const [sortDirection, setSortDirection] = useState<"asc" | "desc">("asc");
  const deferredQuery = useDeferredValue(query);

  const rows = useMemo(() => {
    const filtered = facilities.filter((facility) => {
      if (!facility.slug || facility.ngf_number === null || facility.ngf_number === undefined) {
        return false;
      }

      const haystack = [facility.name, facility.county, facility.city, facility.ngf_number]
        .map((value) => normalizeComparable(value))
        .join(" ");

      return haystack.includes(normalizeComparable(deferredQuery));
    });

    filtered.sort((left, right) => {
      const leftValue = normalizeComparable(left[sortKey]);
      const rightValue = normalizeComparable(right[sortKey]);
      const comparison = leftValue.localeCompare(rightValue, "nb-NO", { numeric: true });
      return sortDirection === "asc" ? comparison : -comparison;
    });

    return filtered;
  }, [deferredQuery, facilities, sortDirection, sortKey]);

  const toggleSort = (key: SortKey) => {
    if (sortKey === key) {
      setSortDirection((current) => (current === "asc" ? "desc" : "asc"));
      return;
    }

    setSortKey(key);
    setSortDirection("asc");
  };

  const renderSortLabel = (key: SortKey, label: string) => (
    <button
      type="button"
      onClick={() => toggleSort(key)}
      className="flex items-center gap-2 text-left text-[11px] font-black uppercase tracking-[0.18em] text-[#112015]"
    >
      <span>{label}</span>
      <span aria-hidden="true" className="text-[#6A766C]">
        {sortKey === key ? (sortDirection === "asc" ? "↑" : "↓") : "↕"}
      </span>
    </button>
  );

  return (
    <div className="space-y-5">
      <div className="flex flex-col gap-3 sm:flex-row sm:items-end sm:justify-between">
        <div>
          <p className="text-[11px] font-black uppercase tracking-[0.24em] text-[#8BC34A]">NGF-nummer</p>
          <p className="mt-3 text-sm leading-6 text-[#536256]">
            Klikk på klubbnavnet for å åpne den respektive baneprofilen.
          </p>
        </div>

        <label className="flex flex-col gap-2">
          <span className="text-[11px] font-black uppercase tracking-[0.18em] text-[#6A766C]">
            Søk
          </span>
          <input
            type="search"
            value={query}
            onChange={(event) => setQuery(event.target.value)}
            placeholder="Søk på klubb, sted eller NGF-nummer"
            className="w-full min-w-[18rem] rounded-[1rem] border border-[#112015]/12 bg-white px-4 py-3 text-sm font-bold text-[#112015] outline-none transition focus:border-[#8BC34A]"
          />
        </label>
      </div>

      <div className="overflow-hidden rounded-[1.75rem] border border-[#112015]/8 bg-white">
        <div className="overflow-x-auto">
          <table className="min-w-full border-collapse">
            <thead className="bg-[#F4F7EE]">
              <tr>
                <th className="px-4 py-4 text-left">{renderSortLabel("name", "Klubb")}</th>
                <th className="px-4 py-4 text-left">{renderSortLabel("ngf_number", "NGF-nummer")}</th>
                <th className="px-4 py-4 text-left">{renderSortLabel("county", "Fylke")}</th>
              </tr>
            </thead>
            <tbody>
              {rows.map((facility) => (
                <tr key={facility.slug} className="border-t border-[#112015]/8 align-top">
                  <td className="px-4 py-4">
                    <Link
                      href={`/golfbaner/${facility.slug}`}
                      className="text-sm font-black text-[#112015] underline underline-offset-4"
                    >
                      {facility.name}
                    </Link>
                    {facility.city ? (
                      <p className="mt-1 text-xs font-bold text-[#6A766C]">{facility.city}</p>
                    ) : null}
                  </td>
                  <td className="px-4 py-4 text-sm font-bold text-[#334238]">
                    {facility.ngf_number || "—"}
                  </td>
                  <td className="px-4 py-4 text-sm font-bold text-[#334238]">
                    {facility.county || "—"}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>

      <p className="text-sm font-bold text-[#5A685C]">
        {rows.length} klubber/anlegg med NGF-nummer
      </p>
    </div>
  );
}