import type { Metadata } from "next";
import Link from "next/link";
import { Container, SectionHeading } from "@/components/ui";
import { ScrollReveal } from "@/components/scroll-reveal";
import { ProductCard } from "@/components/product-card";
import { RecentlyViewedSection } from "@/components/recently-viewed-section";
import { getActiveProducts, type ProductSort } from "@/lib/data";
import { getReviewSummariesByProductIds } from "@/lib/reviews";
import { getSiteUrl } from "@/lib/url";
import { getLocale } from "@/i18n/locale";
import { getDictionary } from "@/i18n/get-dictionary";
import type { ProductCategory } from "@/generated/prisma/client";

export const metadata: Metadata = {
  title: "Shop",
  description: "Hochwertiger Honig, Bienenwachskerzen und Propolis aus eigener Imkerei in Altenmünster.",
  alternates: { canonical: "/shop" },
};

// Siehe Begruendung in app/page.tsx.
export const dynamic = "force-dynamic";

function buildHref(params: {
  q?: string;
  kategorie?: string;
  sortierung?: string;
  verfuegbar?: string;
}): string {
  const search = new URLSearchParams();
  if (params.q) search.set("q", params.q);
  if (params.kategorie) search.set("kategorie", params.kategorie);
  if (params.sortierung) search.set("sortierung", params.sortierung);
  if (params.verfuegbar) search.set("verfuegbar", params.verfuegbar);
  const qs = search.toString();
  return qs ? `/shop?${qs}` : "/shop";
}

export default async function ShopPage(props: PageProps<"/shop">) {
  const t = getDictionary(await getLocale());

  const categoryFilters = [
    { value: undefined, label: t.shop.allCategories },
    { value: "HONIG", label: t.common.categories.HONIG },
    { value: "KERZEN", label: t.common.categories.KERZEN },
    { value: "PROPOLIS", label: t.common.categories.PROPOLIS },
  ] as const;

  const sortOptions: { value: ProductSort | ""; label: string }[] = [
    { value: "", label: t.shop.sortNewest },
    { value: "preis-auf", label: t.shop.sortPriceAsc },
    { value: "preis-ab", label: t.shop.sortPriceDesc },
    { value: "verfuegbarkeit", label: t.shop.sortAvailability },
  ];

  const { q, kategorie, sortierung, verfuegbar } = await props.searchParams;
  const query = typeof q === "string" ? q : undefined;
  const category =
    typeof kategorie === "string" && ["HONIG", "KERZEN", "PROPOLIS"].includes(kategorie)
      ? (kategorie as ProductCategory)
      : undefined;
  const sort =
    typeof sortierung === "string" && ["preis-auf", "preis-ab", "verfuegbarkeit"].includes(sortierung)
      ? (sortierung as ProductSort)
      : undefined;
  const onlyAvailable = verfuegbar === "1";

  const products = await getActiveProducts({ query, category, sort, onlyAvailable });
  const reviewSummaries = await getReviewSummariesByProductIds(products.map((p) => p.id));

  const base = getSiteUrl();
  const breadcrumbJsonLd = {
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    itemListElement: [
      { "@type": "ListItem", position: 1, name: "Start", item: base },
      { "@type": "ListItem", position: 2, name: "Shop", item: `${base}/shop` },
    ],
  };

  return (
    <div className="py-20">
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{ __html: JSON.stringify(breadcrumbJsonLd).replace(/</g, "\\u003c") }}
      />
      <Container>
        <ScrollReveal>
          <SectionHeading
            level="h1"
            eyebrow={t.shop.eyebrow}
            title={t.shop.title}
            subtitle={t.shop.subtitle}
          />
        </ScrollReveal>

        <div className="mt-8 flex flex-wrap gap-3">
          {categoryFilters.map((filter) => {
            const isActive = filter.value === category;
            const href = buildHref({
              q: query,
              kategorie: filter.value,
              sortierung: sort,
              verfuegbar: onlyAvailable ? "1" : undefined,
            });
            return (
              <Link
                key={filter.label}
                href={href}
                className={`text-sm tracking-wide-caps px-4 py-2 border transition-colors ${
                  isActive
                    ? "bg-forest text-cream border-forest"
                    : "border-ink/20 text-ink/70 hover:border-forest"
                }`}
              >
                {filter.label}
              </Link>
            );
          })}
        </div>

        <div className="mt-6 flex flex-wrap items-center gap-4">
          {/* GET-Formular statt Client-Component: funktioniert ohne JavaScript,
              die Auswahl wird per Seiten-Neuladen als Query-Parameter uebernommen.
              Die Suche ist bewusst Teil DIESES Formulars (statt nur der kleinen
              Kopfzeilen-Suche): so werden Kategorie/Verfuegbarkeit-Filter beim
              Aendern der Suche innerhalb der Shop-Seite nicht verworfen — anders
              als bei der Kopfzeilen-Suche, die immer neu auf /shop startet. */}
          <form action="/shop" method="GET" className="flex flex-wrap items-center gap-2 text-sm text-ink/70">
            {category ? <input type="hidden" name="kategorie" value={category} /> : null}
            {onlyAvailable ? <input type="hidden" name="verfuegbar" value="1" /> : null}
            <label htmlFor="shop-search" className="sr-only">
              {t.shop.searchInputLabel}
            </label>
            <input
              id="shop-search"
              type="search"
              name="q"
              defaultValue={query ?? ""}
              placeholder={t.nav.searchPlaceholder}
              className="border border-ink/20 bg-background px-3 py-2 focus:outline-none focus:border-forest"
            />
            <label htmlFor="sortierung">{t.shop.sortLabel}</label>
            <select
              id="sortierung"
              name="sortierung"
              defaultValue={sort ?? ""}
              className="border border-ink/20 bg-background px-2 py-2"
            >
              {sortOptions.map((option) => (
                <option key={option.value} value={option.value}>
                  {option.label}
                </option>
              ))}
            </select>
            <button type="submit" className="border border-ink/20 px-3 py-2 hover:border-forest">
              {t.shop.apply}
            </button>
          </form>
          <Link
            href={buildHref({
              q: query,
              kategorie: category,
              sortierung: sort,
              verfuegbar: onlyAvailable ? undefined : "1",
            })}
            className={`text-sm tracking-wide-caps px-4 py-2 border transition-colors ${
              onlyAvailable
                ? "bg-forest text-cream border-forest"
                : "border-ink/20 text-ink/70 hover:border-forest"
            }`}
          >
            {t.shop.onlyAvailable}
          </Link>
        </div>

        {query ? (
          <p className="mt-6 text-sm text-ink/70">
            {t.shop.searchResults(query, products.length)}{" "}
            <Link
              href={buildHref({ kategorie: category, sortierung: sort, verfuegbar: onlyAvailable ? "1" : undefined })}
              className="underline hover:text-forest"
            >
              {t.shop.clearSearch}
            </Link>
          </p>
        ) : null}
        <h2 className="sr-only">{t.shop.productsHeading}</h2>
        <div className="mt-14 grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-x-8 gap-y-14">
          {products.map((product) => (
            <ProductCard key={product.id} product={product} reviewSummary={reviewSummaries.get(product.id)} />
          ))}
        </div>
        {products.length === 0 ? (
          <p className="mt-10 text-ink/70">
            {query ? t.shop.noSearchResults : t.shop.noProducts}
          </p>
        ) : null}

        <RecentlyViewedSection />
      </Container>
    </div>
  );
}