import type { Metadata } from "next";
import { defineQuery } from "next-sanity";
import { sanity } from "@/lib/sanity";
import { ArtistCard } from "@/components/artist/ArtistCard";
import type { ArtistCardData } from "@/components/artist/types";
import { AnimatedText } from "@/components/AnimatedText";
import { SearchBar } from "@/components/SearchBar";
import { PaginationNav } from "@/components/PaginationNav";
import { CARD_GRID_CLASSES_4 } from "@/lib/constants";
import { PAGE_SIZE, clampInt, normalizeQuery, groqLikeParam } from "@/lib/listHelpers";
import type { SortOption } from "@/components/SortDropdown";

export const revalidate = 86400;

type SortMode = "name" | "sortKey";

const SORT_OPTIONS: SortOption<SortMode>[] = [
  { value: "name", label: "Sort by first name" },
  { value: "sortKey", label: "Sort by last name" },
];

function normalizeSort(s: string | undefined): SortMode {
  return s === "sortKey" ? "sortKey" : "name";
}

const ARTISTS_BY_NAME_QUERY = defineQuery(`
*[
  _type == "artist" &&
  (
    $q == "" ||
    name match $qPattern ||
    role match $qPattern
  )
]
| order(lower(name) asc)
[$start...$end]{
  _id,
  name,
  role,
  "slug": slug.current,
  image
}
`);

const ARTISTS_BY_SORT_KEY_QUERY = defineQuery(`
*[
  _type == "artist" &&
  (
    $q == "" ||
    name match $qPattern ||
    role match $qPattern
  )
]
| order(lower(coalesce(sortKey, name)) asc, lower(name) asc)
[$start...$end]{
  _id,
  name,
  role,
  "slug": slug.current,
  image
}
`);

const ARTISTS_COUNT_QUERY = defineQuery(`
count(*[
  _type == "artist" &&
  (
    $q == "" ||
    name match $qPattern ||
    role match $qPattern
  )
])
`);

export const metadata: Metadata = {
  title: "Artists",
  description:
    "Browse all TRPTK artists. Discover performers, soloists, and ensembles featured on our recordings.",
};

export default async function ArtistsPage({
  searchParams,
}: {
  searchParams: Promise<{ page?: string; q?: string; sort?: string }>;
}) {
  const sp = await searchParams;

  const q = normalizeQuery(sp.q);
  const sort = normalizeSort(sp.sort);
  const page = clampInt(sp.page, 1, 1, 9999);

  const start = (page - 1) * PAGE_SIZE;
  const end = start + PAGE_SIZE;

  const qPattern = q ? `${groqLikeParam(q)}*` : "";
  const listQuery = sort === "sortKey" ? ARTISTS_BY_SORT_KEY_QUERY : ARTISTS_BY_NAME_QUERY;

  const [artists, total] = await Promise.all([
    sanity.fetch<ArtistCardData[]>(listQuery, { start, end, q, qPattern }),
    sanity.fetch<number>(ARTISTS_COUNT_QUERY, { q, qPattern }),
  ]);

  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE));
  const safePage = Math.min(page, totalPages);

  const buildHref = (nextPage: number) => {
    const params = new URLSearchParams();
    if (q) params.set("q", q);
    if (sort !== "name") params.set("sort", sort);
    if (nextPage > 1) params.set("page", String(nextPage));
    const qs = params.toString();
    return qs ? `/artists?${qs}` : "/artists";
  };

  return (
    <main className="mx-auto my-auto max-w-300 px-6 py-12 font-silka md:px-8 md:py-16 2xl:max-w-400">
      <div className="mb-10">
        <AnimatedText text="Artists" as="h1" className="font-argesta text-3xl" />
        <p className="mt-2 text-base text-lightsec dark:text-darksec">
          {total ? `${total} artist(s)` : "No artists found."}
        </p>
      </div>

      <div className="mb-12">
        <SearchBar
          initialQuery={q}
          initialSort={sort}
          initialPage={safePage}
          defaultSort="name"
          placeholder="Search artists…"
          sortOptions={SORT_OPTIONS}
          sortAriaLabel="Sort artists"
        />
      </div>

      <section className={CARD_GRID_CLASSES_4}>
        {artists.map((artist) => (
          <ArtistCard
            key={artist._id}
            name={artist.name}
            subtitle={artist.role}
            image={artist.image}
            href={artist.slug ? `/artist/${artist.slug}` : "/artists/"}
          />
        ))}
      </section>

      {totalPages > 1 ? (
        <PaginationNav page={safePage} totalPages={totalPages} buildHref={buildHref} />
      ) : null}
    </main>
  );
}