import { notFound } from 'next/navigation';
import { MDXRemote } from 'next-mdx-remote/rsc';
import { getPostBySlug, getAdjacentPosts, getReadingTime, getHeadings } from '@/lib/blog';
import { Metadata } from 'next';

interface BlogPostProps {
  params: {
    locale: string;
    slug: string;
  };
}

export async function generateMetadata({ params: { locale, slug } }: BlogPostProps): Promise<Metadata> {
  const post = await getPostBySlug(slug, locale);
  
  if (!post) return {};

  const description = post.frontmatter.excerpt || '';

  return {
    title: post.frontmatter.title,
    description: description,
    openGraph: {
      title: post.frontmatter.title,
      description: description,
      type: 'article',
      publishedTime: post.frontmatter.date,
      authors: ['KLZ Cables'],
      url: `https://klz-cables.com/${locale}/blog/${slug}`,
    },
    twitter: {
      card: 'summary_large_image',
      title: post.frontmatter.title,
      description: description,
    },
  };
}

import Link from 'next/link';
import VisualLinkPreview from '@/components/blog/VisualLinkPreview';
import { Callout } from '@/components/ui';
import HighlightBox from '@/components/blog/HighlightBox';
import Stats from '@/components/blog/Stats';
import AnimatedImage from '@/components/blog/AnimatedImage';
import ChatBubble from '@/components/blog/ChatBubble';
import SplitHeading from '@/components/blog/SplitHeading';
import PostNavigation from '@/components/blog/PostNavigation';
import PowerCTA from '@/components/blog/PowerCTA';
import TableOfContents from '@/components/blog/TableOfContents';

const components = {
  VisualLinkPreview,
  Callout,
  HighlightBox,
  Stats,
  AnimatedImage,
  ChatBubble,
  PowerCTA,
  SplitHeading,
  h1: () => null,
  a: ({ href, children, ...props }: any) => {
    if (href?.startsWith('/')) {
      return (
        <Link href={href} {...props} className="text-primary font-medium hover:underline decoration-2 underline-offset-2 transition-all">
          {children}
        </Link>
      );
    }
    return (
      <a
        href={href}
        {...props}
        target="_blank"
        rel="noopener noreferrer"
        className="text-primary font-medium hover:underline decoration-2 underline-offset-2 transition-all inline-flex items-center gap-1"
      >
        {children}
        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14" />
        </svg>
      </a>
    );
  },
  img: (props: any) => (
    <AnimatedImage src={props.src} alt={props.alt} />
  ),
  h2: ({ children, ...props }: any) => (
    <SplitHeading {...props} className="mt-16 mb-6 pb-3 border-b-2 border-primary/20">
      {children}
    </SplitHeading>
  ),
  h3: ({ children, ...props }: any) => (
    <h3 {...props} className="text-2xl font-bold text-text-primary mt-12 mb-4">
      {children}
    </h3>
  ),
  p: ({ children, ...props }: any) => (
    <p {...props} className="text-lg text-text-secondary leading-relaxed mb-6">
      {children}
    </p>
  ),
  ul: ({ children, ...props }: any) => (
    <ul {...props} className="my-8 space-y-3">
      {children}
    </ul>
  ),
  ol: ({ children, ...props }: any) => (
    <ol {...props} className="my-8 space-y-3 list-decimal list-inside">
      {children}
    </ol>
  ),
  li: ({ children, ...props }: any) => (
    <li {...props} className="text-lg text-text-secondary flex items-start gap-3">
      <span className="text-primary mt-1.5 flex-shrink-0">
        <svg className="w-5 h-5" fill="currentColor" viewBox="0 0 20 20">
          <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clipRule="evenodd" />
        </svg>
      </span>
      <span className="flex-1">{children}</span>
    </li>
  ),
  blockquote: ({ children, ...props }: any) => (
    <blockquote {...props} className="my-8 pl-6 border-l-4 border-primary bg-neutral-light/30 py-4 pr-6 rounded-r-lg">
      <div className="text-lg text-text-primary italic">
        {children}
      </div>
    </blockquote>
  ),
  strong: ({ children, ...props }: any) => (
    <strong {...props} className="font-bold text-primary">
      {children}
    </strong>
  ),
  code: ({ children, ...props }: any) => (
    <code {...props} className="px-2 py-1 bg-neutral-light text-primary rounded font-mono text-sm">
      {children}
    </code>
  ),
  pre: ({ children, ...props }: any) => (
    <pre {...props} className="my-8 p-6 bg-neutral-dark/5 rounded-xl overflow-x-auto">
      {children}
    </pre>
  ),
  table: ({ children, ...props }: any) => (
    <div className="my-8 overflow-x-auto rounded-lg border border-neutral-200 shadow-sm">
      <table {...props} className="w-full text-left text-sm text-text-secondary">
        {children}
      </table>
    </div>
  ),
  thead: ({ children, ...props }: any) => (
    <thead {...props} className="bg-neutral-50 text-text-primary font-semibold border-b border-neutral-200">
      {children}
    </thead>
  ),
  tbody: ({ children, ...props }: any) => (
    <tbody {...props} className="divide-y divide-neutral-200 bg-white">
      {children}
    </tbody>
  ),
  tr: ({ children, ...props }: any) => (
    <tr {...props} className="hover:bg-neutral-50/50 transition-colors">
      {children}
    </tr>
  ),
  th: ({ children, ...props }: any) => (
    <th {...props} className="px-6 py-4 whitespace-nowrap">
      {children}
    </th>
  ),
  td: ({ children, ...props }: any) => (
    <td {...props} className="px-6 py-4">
      {children}
    </td>
  ),
};

export default async function BlogPost({ params: { locale, slug } }: BlogPostProps) {
  const post = await getPostBySlug(slug, locale);
  const { prev, next } = await getAdjacentPosts(slug, locale);

  if (!post) {
    notFound();
  }

  const headings = getHeadings(post.content);

  return (
    <article className="bg-white min-h-screen font-sans selection:bg-primary/10 selection:text-primary">
      
      {/* Featured Image Header */}
      {post.frontmatter.featuredImage ? (
        <div className="relative w-full h-[70vh] min-h-[500px] overflow-hidden group">
          <div 
            className="absolute inset-0 bg-cover bg-center transition-transform duration-[3s] ease-out scale-110 group-hover:scale-100"
            style={{ backgroundImage: `url(${post.frontmatter.featuredImage})` }}
          />
          <div className="absolute inset-0 bg-gradient-to-t from-neutral-dark via-neutral-dark/40 to-transparent" />
          
          {/* Title overlay on image */}
          <div className="absolute inset-0 flex flex-col justify-end pb-16 md:pb-24">
            <div className="container mx-auto px-4">
              <div className="max-w-4xl">
                {post.frontmatter.category && (
                  <div className="overflow-hidden mb-6">
                    <span className="inline-block px-4 py-1.5 bg-accent text-neutral-dark text-xs font-bold uppercase tracking-[0.2em] rounded-sm animate-slight-fade-in-from-bottom">
                      {post.frontmatter.category}
                    </span>
                  </div>
                )}
                <h1 className="text-4xl md:text-6xl lg:text-7xl font-bold text-white mb-8 leading-[1.1] drop-shadow-2xl animate-slight-fade-in-from-bottom [animation-delay:200ms]">
                  {post.frontmatter.title}
                </h1>
                <div className="flex flex-wrap items-center gap-6 text-white/80 text-sm md:text-base font-medium animate-slight-fade-in-from-bottom [animation-delay:400ms]">
                  <time dateTime={post.frontmatter.date}>
                    {new Date(post.frontmatter.date).toLocaleDateString(locale, {
                      year: 'numeric',
                      month: 'long',
                      day: 'numeric'
                    })}
                  </time>
                  <span className="w-1 h-1 bg-white/30 rounded-full" />
                  <span>{getReadingTime(post.content)} min read</span>
                </div>
              </div>
            </div>
          </div>
        </div>
      ) : (
        <header className="pt-32 pb-16 bg-neutral-50 border-b border-neutral-100">
          <div className="container mx-auto px-4 max-w-4xl">
            {post.frontmatter.category && (
              <div className="mb-6">
                <span className="inline-block px-4 py-1.5 bg-primary/10 text-primary text-xs font-bold uppercase tracking-[0.2em] rounded-sm">
                  {post.frontmatter.category}
                </span>
              </div>
            )}
            <h1 className="text-4xl md:text-6xl font-bold text-text-primary mb-8 leading-tight">
              {post.frontmatter.title}
            </h1>
            <div className="flex items-center gap-6 text-text-secondary font-medium">
              <time dateTime={post.frontmatter.date}>
                {new Date(post.frontmatter.date).toLocaleDateString(locale, {
                  year: 'numeric',
                  month: 'long',
                  day: 'numeric'
                })}
              </time>
              <span className="w-1 h-1 bg-neutral-300 rounded-full" />
              <span>{getReadingTime(post.content)} min read</span>
            </div>
          </div>
        </header>
      )}

      {/* Main Content Area with Sticky Narrative Layout */}
      <div className="container mx-auto px-4 py-16 md:py-24">
        <div className="sticky-narrative-container">
          {/* Left Column: Content */}
          <div className="sticky-narrative-content">
            {/* Excerpt/Lead paragraph if available */}
            {post.frontmatter.excerpt && (
              <div className="mb-16 animate-slight-fade-in-from-bottom [animation-delay:600ms]">
                <p className="text-xl md:text-2xl text-text-primary leading-relaxed font-medium border-l-4 border-primary pl-8 py-2 italic">
                  {post.frontmatter.excerpt}
                </p>
              </div>
            )}

            {/* Main content with enhanced styling */}
            <div className="prose prose-lg md:prose-xl max-w-none prose-headings:font-bold prose-headings:text-text-primary prose-p:text-text-secondary prose-p:leading-relaxed prose-a:text-primary prose-a:no-underline hover:prose-a:underline prose-img:rounded-2xl prose-img:shadow-2xl prose-blockquote:border-primary prose-blockquote:bg-primary/5 prose-blockquote:rounded-r-2xl prose-strong:text-primary animate-slight-fade-in-from-bottom [animation-delay:800ms]">
              <MDXRemote source={post.content} components={components} />
            </div>

            {/* Power CTA */}
            <div className="mt-24 animate-slight-fade-in-from-bottom">
              <PowerCTA locale={locale} />
            </div>

            {/* Post Navigation */}
            <div className="mt-16">
              <PostNavigation prev={prev} next={next} locale={locale} />
            </div>

            {/* Back to blog link */}
            <div className="mt-16 pt-10 border-t border-neutral-100">
              <Link
                href={`/${locale}/blog`}
                className="inline-flex items-center gap-3 text-text-secondary hover:text-primary font-bold text-sm uppercase tracking-widest transition-all group"
              >
                <svg className="w-5 h-5 transition-transform group-hover:-translate-x-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
                </svg>
                {locale === 'de' ? 'Zurück zur Übersicht' : 'Back to Overview'}
              </Link>
            </div>
          </div>

          {/* Right Column: Sticky Sidebar */}
          <aside className="sticky-narrative-sidebar hidden lg:block">
            <div className="space-y-12">
              <TableOfContents headings={headings} locale={locale} />
            </div>
          </aside>
        </div>
      </div>

      {/* Structured Data */}
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{
          __html: JSON.stringify({
            '@context': 'https://schema.org',
            '@type': 'BlogPosting',
            headline: post.frontmatter.title,
            datePublished: post.frontmatter.date,
            image: post.frontmatter.featuredImage ? `https://klz-cables.com${post.frontmatter.featuredImage}` : undefined,
            author: {
              '@type': 'Organization',
              name: 'KLZ Cables',
              url: 'https://klz-cables.com',
            },
            publisher: {
              '@type': 'Organization',
              name: 'KLZ Cables',
              logo: {
                '@type': 'ImageObject',
                url: 'https://klz-cables.com/logo.png',
              },
            },
            description: post.frontmatter.excerpt,
          }),
        }}
      />
    </article>
  );
}