import Link from "next/link";
import type { Metadata } from "next";
import { requireUser } from "@/lib/auth";
import { getSettings } from "@/lib/settings";
import { getLibrary, getLibraryFacets, type LibraryFilters as Filters, type LibrarySort } from "@/lib/queries";
import { AppShell } from "@/components/AppShell";
import { LibraryCard } from "@/components/library/LibraryCard";
import { LibraryFilters } from "@/components/library/LibraryFilters";
import { SearchPendingProvider, SearchResults } from "@/components/SearchPending";
import type { EntryStatus, TitleType } from "@/generated/prisma/client";

export const metadata: Metadata = { title: "Bibliothek" };

const STATUSES = ["WATCHING", "PAUSED", "COMPLETED", "DROPPED", "WATCHLIST"];
const SORTS = ["aktualisiert", "hinzugefuegt", "titel", "bewertung", "jahr"];

export default async function LibraryPage({
  searchParams,
}: {
  searchParams: Promise<Record<string, string | undefined>>;
}) {
  const user = await requireUser("/bibliothek");
  const settings = await getSettings();
  const params = await searchParams;

  const filters: Filters = {
    query: params.q?.trim() || undefined,
    status: STATUSES.includes(params.status ?? "") ? (params.status as EntryStatus) : undefined,
    type: params.typ === "SERIES" || params.typ === "MOVIE" ? (params.typ as TitleType) : undefined,
    genre: params.genre || undefined,
    tag: params.tag || undefined,
    provider: params.dienst || undefined,
    owned: params.sammlung === "1" ? true : undefined,
    sort: SORTS.includes(params.sortierung ?? "") ? (params.sortierung as LibrarySort) : undefined,
  };

  const [items, facets] = await Promise.all([
    getLibrary(user.id, filters),
    getLibraryFacets(user.id),
  ]);

  const hasFilters = Object.values(filters).some(Boolean);

  return (
    <AppShell user={user} instanceName={settings.instanceName}>
      <header className="mb-5 flex flex-wrap items-end justify-between gap-3">
        <div>
          <h1 className="text-2xl font-semibold tracking-tight sm:text-3xl">Bibliothek</h1>
          <p className="mt-1 text-sm text-[var(--fl-muted)]">
            {facets.counts.ALLE === 0
              ? "Noch nichts aufgenommen."
              : `${facets.counts.ALLE} ${facets.counts.ALLE === 1 ? "Titel" : "Titel"} — davon ${facets.counts.WATCHING} gerade am Laufen.`}
          </p>
        </div>
        <Link href="/suche" className="fl-btn fl-btn-primary">
          Titel hinzufügen
        </Link>
      </header>

      <SearchPendingProvider>
        {facets.counts.ALLE > 0 && <LibraryFilters facets={facets} />}

        <SearchResults>
          <div className="mt-6">
            {items.length === 0 ? (
              <div className="fl-card p-8 text-center">
                <p className="text-[var(--fl-muted)]">
                  {facets.counts.ALLE === 0
                    ? "Deine Bibliothek ist noch leer."
                    : hasFilters
                      ? "Zu dieser Auswahl passt nichts."
                      : "Hier ist nichts."}
                </p>
                {facets.counts.ALLE === 0 && (
                  <Link href="/suche" className="fl-btn fl-btn-primary mt-4">
                    Ersten Titel suchen
                  </Link>
                )}
              </div>
            ) : (
              <>
                <p className="mb-4 text-sm text-[var(--fl-faint)]">
                  {items.length} {items.length === 1 ? "Titel" : "Titel"}
                </p>
                <ul className="grid grid-cols-2 gap-4 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-6">
                  {items.map((item) => (
                    <li key={item.entryId}>
                      <LibraryCard item={item} />
                    </li>
                  ))}
                </ul>
              </>
            )}
          </div>
        </SearchResults>
      </SearchPendingProvider>
    </AppShell>
  );
}