import { notFound } from "next/navigation";
import type { Metadata } from "next";
import { loadDictionary } from "@allai/i18n/server";
import { locales, resolveLocale } from "@/config/i18n";
import { getBlogPosts } from "@/features/marketing/blogData";
import { absoluteUrl, buildCanonical, buildLocaleAlternates, buildOpenGraph, buildTwitterCard } from "@/seo/seoUtils";

const PATH_PREFIX = "/blog" as const;

type PageProps = {
  params: { locale: string; slug: string };
};

export function generateStaticParams() {
  return locales.flatMap((locale) => getBlogPosts(locale).map((post) => ({ locale, slug: post.slug })));
}

export async function generateMetadata({ params }: PageProps): Promise<Metadata> {
  const locale = resolveLocale(params.locale);

  if (!locales.includes(locale)) {
    return {
      title: "Article not found"
    };
  }

  const dictionary = await loadDictionary(locale);
  const post = getBlogPosts(locale).find((item) => item.slug === params.slug);

  if (!post) {
    const notFoundTitle =
      locale === "ru"
        ? `Статья не найдена | ${dictionary.common.brandLong ?? dictionary.common.brandShort}`
        : locale === "es"
          ? `Artículo no encontrado | ${dictionary.common.brandLong ?? dictionary.common.brandShort}`
          : locale === "pt"
            ? `Artigo não encontrado | ${dictionary.common.brandLong ?? dictionary.common.brandShort}`
            : `Article not found | ${dictionary.common.brandLong ?? dictionary.common.brandShort}`;
    return { title: notFoundTitle };
  }

  const title = `${post.title} | ${dictionary.common.brandLong ?? dictionary.common.brandShort}`;
  const description = post.excerpt;
  const path = `${PATH_PREFIX}/${post.slug}`;

  return {
    title,
    description,
    alternates: {
      canonical: buildCanonical(locale, path),
      languages: buildLocaleAlternates(path)
    },
    openGraph: {
      ...buildOpenGraph({
        locale,
        title,
        description,
        path,
        type: "article"
      }),
      publishedTime: post.publishedAt,
      section: post.category
    },
    twitter: buildTwitterCard({
      title,
      description
    })
  };
}

export default async function BlogArticlePage({ params }: PageProps) {
  const locale = resolveLocale(params.locale);

  if (!locales.includes(locale)) {
    notFound();
  }

  const dictionary = await loadDictionary(locale);
  const post = getBlogPosts(locale).find((item) => item.slug === params.slug);

  if (!post) {
    notFound();
  }

  const canonical = buildCanonical(locale, `${PATH_PREFIX}/${post.slug}`);
  const publisher = {
    "@type": "Organization",
    name: dictionary.common.brandLong ?? dictionary.common.brandShort,
    logo: {
      "@type": "ImageObject",
      url: absoluteUrl("/favicon.ico")
    }
  };

  const structuredData = {
    "@context": "https://schema.org",
    "@type": "BlogPosting",
    headline: post.title,
    description: post.excerpt,
    author: publisher,
    publisher,
    datePublished: post.publishedAt,
    dateModified: post.publishedAt,
    articleSection: post.category,
    mainEntityOfPage: canonical,
    url: canonical,
    inLanguage: locale,
    wordCount: post.content.replace(/<[^>]+>/g, " ").trim().split(/\s+/).length
  };

  return (
    <main style={{ maxWidth: 960, margin: "0 auto", padding: "72px 24px", display: "grid", gap: 32 }}>
      <script
        type="application/ld+json"
        suppressHydrationWarning
        dangerouslySetInnerHTML={{ __html: JSON.stringify(structuredData) }}
      />

      <header style={{ display: "grid", gap: 12 }}>
        <span style={{ fontSize: 14, textTransform: "uppercase", color: "var(--color-muted)", fontWeight: 600 }}>
          {post.category}
        </span>
        <h1 style={{ fontSize: 46, fontWeight: 700, margin: 0 }}>{post.title}</h1>
        <div style={{ display: "flex", gap: 12, fontSize: 14, color: "var(--color-muted)" }}>
          <span>{post.published}</span>
          <span>{`\u2022`}</span>
          <span>{post.readingTime}</span>
        </div>
      </header>

      <article
        style={{ color: "var(--color-foreground)", lineHeight: 1.75, fontSize: 18, display: "grid", gap: 24 }}
        dangerouslySetInnerHTML={{ __html: post.content }}
      />

      <footer style={{ borderTop: "1px solid var(--surface-border)", paddingTop: 24 }}>
        <p style={{ color: "var(--color-muted)" }}>
          {locale === "ru" ? (
            <>
              Понравилась статья? Смотрите другие материалы в <a href={`/${locale}/blog`}>блоге</a> или пишите нам на{" "}
              <a href="mailto:hello@allai.studio">hello@allai.studio</a>.
            </>
          ) : locale === "es" ? (
            <>
              ¿Te gustó el artículo? Explora más ideas en el <a href={`/${locale}/blog`}>blog</a> o escríbenos a{" "}
              <a href="mailto:hello@allai.studio">hello@allai.studio</a>.
            </>
          ) : locale === "pt" ? (
            <>
              Gostou do artigo? Veja mais ideias no <a href={`/${locale}/blog`}>blog</a> ou escreva para{" "}
              <a href="mailto:hello@allai.studio">hello@allai.studio</a>.
            </>
          ) : (
            <>
              Enjoyed this article? Explore more insights on the <a href={`/${locale}/blog`}>blog</a> or reach out to us
              at <a href="mailto:hello@allai.studio">hello@allai.studio</a>.
            </>
          )}
        </p>
      </footer>
    </main>
  );
}