import Link from 'next/link';
import { ChevronRight } from 'lucide-react';
import type { Metadata } from 'next';

async function getBlog(slug: string) {
  try {
    const res = await fetch(`http://localhost:4000/api/blogs/${slug}`, { next: { revalidate: 60 } });
    if (!res.ok) throw new Error('Failed to fetch blog');
    return res.json();
  } catch (error) {
    console.error(error);
    return null;
  }
}

export async function generateMetadata({ params }: { params: { slug: string } }): Promise<Metadata> {
  const blog = await getBlog(params.slug);
  if (!blog) return { title: 'مقاله یافت نشد' };
  
  return {
    title: blog.metaTitle || blog.title,
    description: blog.metaDescription || blog.title,
  };
}

export default async function BlogPage({ params }: { params: { slug: string } }) {
  const blog = await getBlog(params.slug);

  if (!blog) {
    return (
      <div className="min-h-[50vh] flex flex-col items-center justify-center font-vazir text-center" dir="rtl">
        <h1 className="text-3xl font-black text-medical-gray-900 mb-4">مقاله‌ای یافت نشد</h1>
        <Link href="/wiki" className="text-canino-blue font-bold flex items-center gap-2">
          <ChevronRight className="w-4 h-4" />
          بازگشت به دانشنامه
        </Link>
      </div>
    );
  }

  return (
    <div className="bg-white py-20 px-4 font-vazir" dir="rtl">
      <div className="max-w-4xl mx-auto">
        <Link href="/wiki" className="inline-flex items-center gap-2 text-medical-gray-400 hover:text-canino-blue transition-colors font-bold mb-8">
          <ChevronRight className="w-5 h-5" />
          بازگشت به مقالات
        </Link>

        {blog.imageUrl && (
          <div className="aspect-video rounded-[2rem] overflow-hidden mb-12 shadow-xl border border-medical-gray-100">
            <img src={blog.imageUrl} alt={blog.title} className="w-full h-full object-cover" />
          </div>
        )}

        <h1 className="text-4xl lg:text-5xl font-black text-medical-gray-900 mb-6 leading-tight">
          {blog.title}
        </h1>

        <div className="flex items-center gap-4 text-sm font-bold text-medical-gray-400 mb-12 pb-8 border-b border-medical-gray-100">
          <span>نوشته شده در {new Date(blog.createdAt).toLocaleDateString('fa-IR')}</span>
          {blog.author && (
             <>
               <span className="w-1 h-1 rounded-full bg-medical-gray-300" />
               <span>توسط {blog.author.firstName} {blog.author.lastName}</span>
             </>
          )}
        </div>

        <div 
          className="prose prose-lg prose-medical-gray max-w-none prose-headings:font-black prose-p:leading-relaxed prose-a:text-canino-blue"
          dangerouslySetInnerHTML={{ __html: blog.content }}
        />
      </div>
    </div>
  );
}