import type { Metadata } from "next";
import { notFound } from "next/navigation";
import Link from "next/link";
import { Container } from "@/components/ui";
import { BackLink } from "@/components/back-link";
import { wissenSlugs } from "@/lib/site-config";
import { getSiteUrl } from "@/lib/url";
import { getCompanyInfo } from "@/lib/company-info";
import { getLocale } from "@/i18n/locale";
import { getDictionary } from "@/i18n/get-dictionary";
import type { WissenSlug } from "@/i18n/dictionary-type";

function isWissenSlug(slug: string): slug is WissenSlug {
  return (wissenSlugs as readonly string[]).includes(slug);
}

export async function generateMetadata(
  props: PageProps<"/wissen/[slug]">
): Promise<Metadata> {
  const { slug } = await props.params;
  if (!isWissenSlug(slug)) return {};
  const t = getDictionary(await getLocale());
  const article = t.wissenArticles[slug];
  return {
    title: article.title,
    description: article.excerpt,
    alternates: { canonical: `/wissen/${slug}` },
  };
}

export function generateStaticParams() {
  return wissenSlugs.map((slug) => ({ slug }));
}

export default async function WissenArticlePage(
  props: PageProps<"/wissen/[slug]">
) {
  const { slug } = await props.params;
  if (!isWissenSlug(slug)) notFound();
  const t = getDictionary(await getLocale());
  const article = t.wissenArticles[slug];

  const otherArticles = wissenSlugs.filter((s) => s !== slug).slice(0, 2);

  const company = await getCompanyInfo();
  const base = getSiteUrl();
  // Kein datePublished/image: fuer diese Artikel existiert kein echtes
  // Veroeffentlichungsdatum und keine echte Fotografie — beides zu erfinden
  // waere irrefuehrende strukturierte Daten statt hilfreicher.
  const jsonLd = {
    "@context": "https://schema.org",
    "@type": "Article",
    headline: article.title,
    description: article.excerpt,
    author: { "@type": "Organization", name: company.name },
    publisher: { "@type": "Organization", name: company.name },
    mainEntityOfPage: `${base}/wissen/${slug}`,
  };
  const breadcrumbJsonLd = {
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    itemListElement: [
      { "@type": "ListItem", position: 1, name: t.wissenListPage.eyebrow, item: `${base}/wissen` },
      { "@type": "ListItem", position: 2, name: article.title, item: `${base}/wissen/${slug}` },
    ],
  };

  return (
    <div className="py-20">
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd).replace(/</g, "\\u003c") }}
      />
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{ __html: JSON.stringify(breadcrumbJsonLd).replace(/</g, "\\u003c") }}
      />
      <Container className="max-w-2xl">
        <BackLink href="/wissen" label={t.wissenArticlePage.backLabel} />
        <p className="tracking-wide-caps text-xs text-honey-dark mb-3">{t.wissenArticlePage.eyebrow}</p>
        <h1 className="text-3xl text-forest">{article.title}</h1>
        <div className="mt-8 space-y-5 text-ink/75 leading-relaxed">
          {article.body.map((paragraph, i) => (
            <p key={i}>{paragraph}</p>
          ))}
        </div>

        {otherArticles.length > 0 ? (
          <div className="mt-16 border-t border-ink/10 pt-10">
            <p className="text-sm tracking-wide-caps text-ink/70 mb-6">{t.wissenArticlePage.otherArticlesHeading}</p>
            <div className="space-y-6">
              {otherArticles.map((otherSlug) => {
                const other = t.wissenArticles[otherSlug];
                return (
                  <Link key={otherSlug} href={`/wissen/${otherSlug}`} className="group block">
                    <h2 className="text-lg text-forest group-hover:underline">{other.title}</h2>
                    <p className="mt-1 text-sm text-ink/65 leading-relaxed">{other.excerpt}</p>
                  </Link>
                );
              })}
            </div>
          </div>
        ) : null}
      </Container>
    </div>
  );
}