import { Link, useParams } from 'react-router-dom';
import { ArrowLeft, Clock, Info, AlertTriangle } from 'lucide-react';
import { PublicLayout } from '@/components/public/PublicLayout';
import { getPost, type Block } from '@/content/posts';
import { formatDate } from '@/lib/format';
import { cn } from '@/lib/cn';

export default function BlogPostPage() {
  const { slug } = useParams<{ slug: string }>();
  const post = slug ? getPost(slug) : undefined;

  if (!post) {
    return (
      <PublicLayout>
        <section className="container py-24 max-w-2xl text-center">
          <h1 className="text-2xl font-bold text-ink-950 font-display">Post not found</h1>
          <Link to="/blog" className="mt-4 inline-block text-brand-600 hover:text-brand-700">
            ← Back to blog
          </Link>
        </section>
      </PublicLayout>
    );
  }

  return (
    <PublicLayout>
      <article className="container py-12 max-w-3xl">
        <Link to="/blog" className="inline-flex items-center gap-1.5 text-sm text-ink-500 hover:text-ink-800 mb-6">
          <ArrowLeft className="h-4 w-4" />
          All posts
        </Link>

        <header className="mb-10">
          <p className="text-xs uppercase tracking-wider text-brand-600 font-semibold">Blog</p>
          <h1 className="mt-3 text-3xl md:text-5xl font-bold text-ink-950 font-display leading-tight">
            {post.title}
          </h1>
          <p className="mt-4 text-lg text-ink-600 leading-relaxed">{post.description}</p>
          <div className="mt-6 flex items-center gap-3 text-sm text-ink-500">
            <span>{post.author}</span>
            <span className="text-ink-300">·</span>
            <time dateTime={post.publishedAt}>{formatDate(post.publishedAt)}</time>
            <span className="text-ink-300">·</span>
            <span className="inline-flex items-center gap-1.5">
              <Clock className="h-3.5 w-3.5" />
              {post.readMinutes} min read
            </span>
          </div>
        </header>

        {post.coverImage && (
          <img
            src={post.coverImage}
            alt=""
            className="mb-10 aspect-[16/9] w-full rounded-2xl border border-ink-100 object-cover"
          />
        )}

        <div className="space-y-5">
          {post.body.map((b, i) => (
            <RenderBlock key={i} block={b} />
          ))}
        </div>

        <footer className="mt-16 border-t border-ink-100 pt-8 flex items-center justify-between">
          <Link to="/blog" className="text-sm text-brand-600 hover:text-brand-700">
            ← All posts
          </Link>
          <Link to="/signup" className="btn-primary text-sm">
            Try eLegal Software free
          </Link>
        </footer>
      </article>
    </PublicLayout>
  );
}

function RenderBlock({ block }: { block: Block }) {
  switch (block.type) {
    case 'p':
      return <p className="text-ink-800 leading-relaxed">{block.text}</p>;
    case 'h2':
      return <h2 className="mt-10 text-2xl md:text-3xl font-bold text-ink-950 font-display">{block.text}</h2>;
    case 'h3':
      return <h3 className="mt-8 text-xl font-semibold text-ink-900 font-display">{block.text}</h3>;
    case 'ul':
      return (
        <ul className="list-disc pl-6 space-y-2 text-ink-800">
          {block.items.map((item, i) => (
            <li key={i}>{item}</li>
          ))}
        </ul>
      );
    case 'ol':
      return (
        <ol className="list-decimal pl-6 space-y-2 text-ink-800">
          {block.items.map((item, i) => (
            <li key={i}>{item}</li>
          ))}
        </ol>
      );
    case 'quote':
      return (
        <blockquote className="border-l-4 border-brand-500 pl-4 italic text-ink-700">{block.text}</blockquote>
      );
    case 'callout': {
      const tone = block.tone;
      const Icon = tone === 'amber' ? AlertTriangle : Info;
      return (
        <div
          className={cn(
            'rounded-2xl p-5 my-2 flex items-start gap-3',
            tone === 'amber'
              ? 'border border-amber-200 bg-amber-50/50 text-amber-900'
              : 'border border-brand-200 bg-brand-50/50 text-ink-800',
          )}
        >
          <Icon className={cn('h-5 w-5 flex-none mt-0.5', tone === 'amber' ? 'text-amber-600' : 'text-brand-600')} />
          <div>
            <p className="font-semibold">{block.title}</p>
            <p className="mt-1 text-sm leading-relaxed">{block.text}</p>
          </div>
        </div>
      );
    }
  }
}