import JsonLd from '@/components/JsonLd';
import { SITE_URL } from '@/lib/schema';
import ProductSidebar from '@/components/ProductSidebar';
import ProductTabs from '@/components/ProductTabs';
import ProductTechnicalData from '@/components/ProductTechnicalData';
import RelatedProducts from '@/components/RelatedProducts';
import DatasheetDownload from '@/components/DatasheetDownload';
import { Badge, Card, Container, Heading, Section } from '@/components/ui';
import { getDatasheetPath } from '@/lib/datasheets';
import { getAllProducts, getProductBySlug } from '@/lib/products';
import { mapFileSlugToTranslated, mapSlugToFileSlug } from '@/lib/slugs';
import { Metadata } from 'next';
import { getTranslations, setRequestLocale } from 'next-intl/server';
import { getProductOGImageMetadata } from '@/lib/metadata';
import Image from 'next/image';
import Link from 'next/link';
import { notFound, redirect } from 'next/navigation';
import ProductEngagementTracker from '@/components/analytics/ProductEngagementTracker';
import PayloadRichText from '@/components/PayloadRichText';

interface ProductPageProps {
  params: Promise<{
    locale: string;
    slug: string[];
  }>;
}

export async function generateMetadata({ params }: ProductPageProps): Promise<Metadata> {
  const { locale, slug } = await params;
  const productSlug = slug[slug.length - 1];
  const t = await getTranslations('Products');

  // Check if it's a category page
  const categories = [
    'low-voltage-cables',
    'medium-voltage-cables',
    'high-voltage-cables',
    'solar-cables',
  ];
  const fileSlug = await mapSlugToFileSlug(productSlug, locale);
  if (categories.includes(fileSlug)) {
    const categoryKey = fileSlug
      .replace(/-cables$/, '')
      .replace(/-([a-z])/g, (g) => g[1].toUpperCase());
    const categoryTitle = t.has(`categories.${categoryKey}.title`)
      ? t(`categories.${categoryKey}.title`)
      : fileSlug;
    const categoryDesc = t.has(`categories.${categoryKey}.description`)
      ? t(`categories.${categoryKey}.description`)
      : '';

    return {
      title: categoryTitle,
      description: categoryDesc,
      alternates: {
        canonical: `${SITE_URL}/${locale}/${await mapFileSlugToTranslated('products', locale)}/${await mapFileSlugToTranslated(fileSlug, locale)}`,
        languages: {
          de: `${SITE_URL}/de/${await mapFileSlugToTranslated('products', 'de')}/${await mapFileSlugToTranslated(fileSlug, 'de')}`,
          en: `${SITE_URL}/en/${await mapFileSlugToTranslated('products', 'en')}/${await mapFileSlugToTranslated(fileSlug, 'en')}`,
          'x-default': `${SITE_URL}/en/${await mapFileSlugToTranslated('products', 'en')}/${await mapFileSlugToTranslated(fileSlug, 'en')}`,
        },
      },
    };
  }

  const fileSlugs = await Promise.all(slug.map((s) => mapSlugToFileSlug(s, locale)));
  const getLocalizedPath = async (lang: string) => {
    const parts = await Promise.all([
      mapFileSlugToTranslated('products', lang),
      ...fileSlugs.map((fs) => mapFileSlugToTranslated(fs, lang)),
    ]);
    return parts.join('/');
  };

  const product = await getProductBySlug(productSlug, locale);
  if (!product) return {};

  const currentLocalePath = await getLocalizedPath(locale);

  return {
    title: product.frontmatter.title,
    description: product.frontmatter.description,
    alternates: {
      canonical: `${SITE_URL}/${locale}/${currentLocalePath}`,
      languages: {
        de: `${SITE_URL}/de/${await getLocalizedPath('de')}`,
        en: `${SITE_URL}/en/${await getLocalizedPath('en')}`,
        'x-default': `${SITE_URL}/en/${await getLocalizedPath('en')}`,
      },
    },
    openGraph: {
      title: product.frontmatter.title,
      description: product.frontmatter.description,
      type: 'website',
      url: `${SITE_URL}/${locale}/${currentLocalePath}`,
      images: getProductOGImageMetadata(productSlug, product.frontmatter.title, locale),
    },
    twitter: {
      card: 'summary_large_image',
      title: product.frontmatter.title,
      description: product.frontmatter.description,
    },
  };
}

export default async function ProductPage({ params }: ProductPageProps) {
  const { locale, slug } = await params;
  setRequestLocale(locale);
  const productSlug = slug[slug.length - 1];
  const t = await getTranslations('Products');
  const productsSlug = await mapFileSlugToTranslated('products', locale);

  const categories = [
    'low-voltage-cables',
    'medium-voltage-cables',
    'high-voltage-cables',
    'solar-cables',
  ];

  const fileSlugs = await Promise.all(slug.map((s) => mapSlugToFileSlug(s, locale)));
  const translatedSlugsForLocale = await Promise.all(
    fileSlugs.map((fs) => mapFileSlugToTranslated(fs, locale)),
  );

  // If the requested slugs don't exactly match the translated slugs for the current locale
  // (i.e. if the user used the static language switcher but kept the original locale's slugs)
  if (slug.join('/') !== translatedSlugsForLocale.join('/')) {
    redirect(`/${locale}/${productsSlug}/${translatedSlugsForLocale.join('/')}`);
  }

  const fileSlug = fileSlugs[fileSlugs.length - 1];

  if (categories.includes(fileSlug)) {
    const allProducts = await getAllProducts(locale);
    const categoryKey = fileSlug
      .replace(/-cables$/, '')
      .replace(/-([a-z])/g, (g) => g[1].toUpperCase());
    const categoryTitle = t.has(`categories.${categoryKey}.title`)
      ? t(`categories.${categoryKey}.title`)
      : fileSlug;

    const filteredProducts = allProducts.filter((p) => {
      const firstCat = p.frontmatter.categories[0] || '';
      const normalizedCat = firstCat.toLowerCase().replace(/\s+/g, '-');
      let pFileSlug = 'low-voltage-cables';
      if (normalizedCat === 'hochspannungskabel' || normalizedCat === 'high-voltage-cables')
        pFileSlug = 'high-voltage-cables';
      else if (
        normalizedCat === 'mittelspannungskabel' ||
        normalizedCat === 'medium-voltage-cables'
      )
        pFileSlug = 'medium-voltage-cables';
      else if (
        normalizedCat === 'solarkabel' ||
        normalizedCat === 'solar-cables' ||
        normalizedCat === 'solar'
      )
        pFileSlug = 'solar-cables';

      return pFileSlug === fileSlug;
    });

    const productsWithTranslatedSlugs = await Promise.all(
      filteredProducts.map(async (p) => ({
        ...p,
        translatedSlug: await mapFileSlugToTranslated(p.slug, locale),
      })),
    );

    return (
      <div className="flex flex-col min-h-screen bg-white">
        <section className="relative min-h-[50vh] flex items-center pt-32 pb-20 overflow-hidden bg-primary-dark">
          <Container className="relative z-10">
            <div className="max-w-4xl animate-slide-up">
              <nav className="flex items-center mb-8 text-white/40 text-sm font-bold uppercase tracking-widest">
                <Link
                  href={`/${locale}/${productsSlug}`}
                  className="hover:text-accent transition-colors"
                >
                  {t.has('breadcrumb') ? t('breadcrumb') : 'Products'}
                </Link>
                <span className="mx-3 opacity-30">/</span>
                <span className="text-white/90">{categoryTitle}</span>
              </nav>
              <Heading level={1} className="text-white mb-8">
                {categoryTitle}
              </Heading>
              <div className="h-1.5 w-24 bg-accent rounded-full" />
            </div>
          </Container>
        </section>

        <Section className="bg-neutral-light relative">
          <Container>
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
              {productsWithTranslatedSlugs.map((product) => (
                <Link
                  key={product.slug}
                  href={`/${locale}/${productsSlug}/${productSlug}/${product.translatedSlug}`}
                  className="group block bg-white rounded-[32px] overflow-hidden shadow-sm hover:shadow-2xl transition-all duration-500 border border-neutral-dark/5"
                >
                  <Card tag="article" className="premium-card-reset">
                    <div className="aspect-[4/3] relative bg-neutral-light/30 p-12 overflow-hidden">
                      {product.frontmatter.images?.[0] && (
                        <>
                          <Image
                            src={product.frontmatter.images[0]}
                            alt={product.frontmatter.title}
                            fill
                            className="object-contain p-8 transition-transform duration-700 group-hover:scale-110 z-10"
                            sizes="(max-width: 768px) 100vw, (max-width: 1024px) 50vw, 33vw"
                          />
                          <div className="absolute bottom-4 left-1/2 -translate-x-1/2 w-2/3 h-4 bg-black/5 blur-xl rounded-full" />
                        </>
                      )}
                    </div>
                    <div className="p-8 md:p-10">
                      <div className="flex flex-wrap gap-2 mb-4">
                        {product.frontmatter.categories.map((cat, i) => (
                          <span
                            key={i}
                            className="text-[10px] font-bold uppercase tracking-widest text-primary/40"
                          >
                            {cat}
                          </span>
                        ))}
                      </div>
                      <h2 className="text-2xl md:text-3xl font-bold text-text-primary group-hover:text-primary transition-colors mb-4 leading-tight">
                        {product.frontmatter.title}
                      </h2>
                      <p className="text-text-secondary line-clamp-2 text-base leading-relaxed mb-8">
                        {product.frontmatter.description}
                      </p>
                      <div className="flex items-center text-primary font-bold group-hover:text-accent-dark transition-colors">
                        <span className="border-b-2 border-primary/10 group-hover:border-accent-dark transition-colors pb-1">
                          {t('details')}
                        </span>
                        <svg
                          className="w-5 h-5 ml-3 transition-transform group-hover:translate-x-1"
                          fill="none"
                          stroke="currentColor"
                          viewBox="0 0 24 24"
                        >
                          <path
                            strokeLinecap="round"
                            strokeLinejoin="round"
                            strokeWidth={2}
                            d="M17 8l4 4m0 0l-4 4m4-4H3"
                          />
                        </svg>
                      </div>
                    </div>
                  </Card>
                </Link>
              ))}
            </div>
          </Container>
        </Section>
      </div>
    );
  }

  const product = await getProductBySlug(productSlug, locale);

  if (!product) {
    notFound();
  }

  // Extract technical data natively from the Lexical AST for Schema.org
  let technicalItems = [];
  if (product.content?.root?.children) {
    const productTabsBlock = product.content.root.children.find(
      (node: any) => node.type === 'block' && node.fields?.blockType === 'productTabs',
    );
    if (productTabsBlock && productTabsBlock.fields?.technicalItems) {
      technicalItems = productTabsBlock.fields.technicalItems;
    }
  }

  const datasheetPath = getDatasheetPath(productSlug, locale);
  const isFallback = (product.frontmatter as any).isFallback;
  const categorySlug = slug[0];
  const categoryFileSlug = await mapSlugToFileSlug(categorySlug, locale);
  const categoryKey = categoryFileSlug
    .replace(/-cables$/, '')
    .replace(/-([a-z])/g, (g) => g[1].toUpperCase());
  const categoryTitle = t.has(`categories.${categoryKey}.title`)
    ? t(`categories.${categoryKey}.title`)
    : categoryFileSlug;

  // Split content into Description and Technical Data
  const rootChildren = product.content?.root?.children || [];
  const technicalBlocks = rootChildren.filter(
    (node: any) =>
      node.type === 'block' &&
      (node.fields?.blockType === 'productTabs' ||
        node.fields?.blockType === 'productTechnicalData'),
  );
  let descriptionChildren = rootChildren.filter(
    (node: any) =>
      !(
        node.type === 'block' &&
        (node.fields?.blockType === 'productTabs' ||
          node.fields?.blockType === 'productTechnicalData')
      ),
  );

  // If no standalone description nodes, extract from the productTabs block's embedded content
  if (descriptionChildren.length === 0) {
    const tabsBlock = rootChildren.find(
      (node: any) => node.type === 'block' && node.fields?.blockType === 'productTabs',
    );
    if (tabsBlock?.fields?.content?.root?.children) {
      descriptionChildren = tabsBlock.fields.content.root.children.filter((node: any) => {
        // Filter out MDX parsing artifacts like `}>`
        if (node.type === 'paragraph' && node.children?.length === 1) {
          const text = node.children[0]?.text?.trim();
          return text !== '}>' && text !== '{' && text !== '}';
        }
        return true;
      });
    }
  }

  console.log(`[DEBUG PAGE] Slug: ${productSlug}, children count: ${descriptionChildren.length}`);

  const descriptionContent = {
    root: {
      ...product.content.root,
      children: descriptionChildren,
    },
  };

  const technicalContent = {
    root: {
      ...product.content.root,
      children: technicalBlocks,
    },
  };

  const sidebar = (
    <ProductSidebar
      productName={product.frontmatter.title}
      productImage={product.frontmatter.images?.[0]}
      datasheetPath={datasheetPath}
    />
  );

  return (
    <div className="flex flex-col min-h-screen bg-white relative">
      {/* Product Hero */}
      <ProductEngagementTracker
        productName={product.frontmatter.title}
        productSlug={productSlug}
        categories={product.frontmatter.categories}
        sku={product.frontmatter.sku}
      />
      <section className="relative pt-28 md:pt-40 pb-12 md:pb-24 overflow-hidden bg-primary-dark">
        {/* Background Decorative Elements */}
        <div className="absolute top-0 right-0 w-1/2 h-full bg-gradient-to-l from-accent/5 to-transparent pointer-events-none" />
        <div className="absolute -top-24 -right-24 w-96 h-96 bg-accent/10 rounded-full blur-3xl pointer-events-none" />

        <Container className="relative z-10">
          <div className="max-w-4xl animate-slide-up">
            <nav className="flex flex-wrap items-center gap-y-1 mb-6 md:mb-12 text-white/40 text-[10px] font-black uppercase tracking-[0.2em]">
              <Link
                href={`/${locale}/${productsSlug}`}
                className="hover:text-accent transition-colors shrink-0"
              >
                {t.has('breadcrumb') ? t('breadcrumb') : 'Products'}
              </Link>
              <span className="mx-2 md:mx-4 opacity-20">/</span>
              <Link
                href={`/${locale}/${productsSlug}/${categorySlug}`}
                className="hover:text-accent transition-colors shrink-0 max-w-[140px] truncate"
              >
                {categoryTitle}
              </Link>
              <span className="mx-2 md:mx-4 opacity-20">/</span>
              <span className="text-white/90 truncate max-w-[140px] md:max-w-none">
                {product.frontmatter.title}
              </span>
            </nav>

            <div className="flex flex-col lg:flex-row lg:items-center justify-between gap-12">
              <div className="flex-1">
                {isFallback && (
                  <div className="mb-8 inline-flex items-center px-4 py-2 rounded-full bg-accent/10 border border-accent/20 text-accent text-[10px] font-black uppercase tracking-[0.2em] backdrop-blur-md">
                    <span className="w-2 h-2 rounded-full bg-accent mr-3 animate-pulse" />
                    {t('englishVersion')}
                  </div>
                )}
                <div className="flex flex-wrap gap-2 mb-4 md:mb-8">
                  {product.frontmatter.categories.map((cat, idx) => (
                    <Badge
                      key={idx}
                      variant="accent"
                      className="bg-white/5 text-white/80 border-white/10 backdrop-blur-md px-5 py-2 text-[10px] font-black tracking-[0.15em]"
                    >
                      {cat}
                    </Badge>
                  ))}
                </div>
                <Heading level={1} className="text-white mb-4 md:mb-8 uppercase">
                  {product.frontmatter.title}
                </Heading>
                <p className="text-base md:text-xl lg:text-2xl text-white/60 max-w-2xl leading-relaxed font-medium">
                  {product.frontmatter.description}
                </p>
              </div>
            </div>
          </div>
        </Container>
      </section>

      <Section className="bg-white relative">
        <Container className="relative">
          {/* Large Product Image Section */}
          {product.frontmatter.images && product.frontmatter.images.length > 0 && (
            <div
              className="relative md:-mt-32 mb-8 md:mb-32 animate-slide-up"
              style={{ animationDelay: '200ms' }}
            >
              <div className="bg-white shadow-[0_32px_64px_-12px_rgba(0,0,0,0.1)] rounded-[24px] md:rounded-[48px] border border-neutral-dark/5 overflow-hidden p-6 md:p-20 lg:p-24">
                <div className="relative w-full aspect-[4/3] md:aspect-[21/9]">
                  <Image
                    src={product.frontmatter.images[0]}
                    alt={product.frontmatter.title}
                    fill
                    sizes="(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw"
                    className="object-contain transition-transform duration-1000 hover:scale-105"
                    priority
                  />
                  {/* Subtle reflection/shadow effect */}
                  <div className="absolute bottom-0 left-1/2 -translate-x-1/2 w-3/4 h-12 bg-black/5 blur-3xl rounded-[100%]" />
                </div>

                {product.frontmatter.images.length > 1 && (
                  <div className="flex justify-center gap-8 mt-20">
                    {product.frontmatter.images.slice(0, 5).map((img, idx) => (
                      <div
                        key={idx}
                        className="relative w-24 h-24 md:w-32 md:h-32 border-2 border-neutral-dark/5 rounded-3xl overflow-hidden bg-neutral-light/30 hover:border-accent transition-all duration-500 cursor-pointer group p-4"
                      >
                        <Image
                          src={img}
                          alt=""
                          fill
                          sizes="128px"
                          className="object-contain p-4 transition-transform duration-700 group-hover:scale-110"
                        />
                      </div>
                    ))}
                  </div>
                )}
              </div>
            </div>
          )}

          <div className="grid grid-cols-1 lg:grid-cols-12 gap-8 lg:gap-20">
            {/* Description Area Next to Sidebar */}
            <div className="lg:col-span-8">
              <div className="max-w-none prose prose-primary prose-base md:prose-lg xl:prose-xl mb-8 md:mb-16 pb-8 md:pb-16 border-b border-neutral-dark/5">
                {descriptionChildren.length > 0 ? (
                  <PayloadRichText data={descriptionContent} />
                ) : product.frontmatter.description ? (
                  <p className="text-lg md:text-xl text-text-secondary leading-relaxed">
                    {product.frontmatter.description}
                  </p>
                ) : null}

                {product.application?.root?.children?.length > 0 && (
                  <div className="mt-12">
                    <PayloadRichText data={product.application} />
                  </div>
                )}
              </div>
            </div>

            {/* Sidebar Column */}
            <div className="lg:col-span-4 lg:sticky lg:top-32 h-fit">{sidebar}</div>
          </div>

          {/* Full-width Technical Data Below */}
          <div className="mt-8 md:mt-16 pt-8 md:pt-16 border-t-0">
            <div className="max-w-none prose prose-primary prose-lg md:prose-xl">
              <PayloadRichText data={technicalContent} />
            </div>

            {/* Datasheet Download Section */}
            {categoryFileSlug === 'medium-voltage-cables' && datasheetPath && (
              <div className="mt-16 pt-16 border-t-2 border-neutral-dark/5">
                <div className="mb-8">
                  <h2 className="text-3xl md:text-4xl font-black text-primary tracking-tighter uppercase mb-4">
                    {t('downloadDatasheet')}
                  </h2>
                  <div className="h-1.5 w-24 bg-accent rounded-full" />
                </div>
                <DatasheetDownload datasheetPath={datasheetPath} />
              </div>
            )}

            {/* Structured Data (Hidden) */}
            <JsonLd
              id={`jsonld-${product.slug}`}
              data={
                {
                  '@context': 'https://schema.org',
                  '@type': 'Product',
                  name: product.frontmatter.title,
                  description: product.frontmatter.description,
                  sku: product.frontmatter.sku || product.slug.toUpperCase(),
                  image: product.frontmatter.images?.[0]
                    ? `${SITE_URL}${product.frontmatter.images[0]}`
                    : undefined,
                  brand: {
                    '@type': 'Brand',
                    name: 'KLZ Cables',
                  },
                  offers: {
                    '@type': 'Offer',
                    availability: 'https://schema.org/InStock',
                    priceCurrency: 'EUR',
                    url: `${SITE_URL}/${locale}/${await mapFileSlugToTranslated('products', locale)}/${slug.join('/')}`,
                    itemCondition: 'https://schema.org/NewCondition',
                  },
                  additionalProperty: technicalItems.map((item: any) => ({
                    '@type': 'PropertyValue',
                    name: item.label,
                    value: item.value,
                  })),
                  category: product.frontmatter.categories.join(', '),
                  mainEntityOfPage: {
                    '@type': 'WebPage',
                    '@id': `${SITE_URL}/${locale}/${await mapFileSlugToTranslated('products', locale)}/${slug.join('/')}`,
                  },
                } as any
              }
            />
          </div>

          {/* Related Products Section */}
          <div className="mt-10 md:mt-16 pt-10 md:pt-16 border-t border-neutral-dark/5">
            <RelatedProducts
              currentSlug={productSlug}
              categories={product.frontmatter.categories}
              locale={locale}
            />
          </div>
        </Container>
      </Section>
    </div>
  );
}