import Link from 'next/link'
import { notFound } from 'next/navigation'
import type { Metadata } from 'next'
import { ArrowLeft } from 'lucide-react'
import type { Article } from '@homaroma/types'

import { API_BASE } from '../../../lib/api'

async function getArticle(slug: string): Promise<Article | null> {
  try {
    const res = await fetch(`${API_BASE}/articles/${slug}`, { next: { revalidate: 300 } })
    return res.ok ? res.json() : null
  } catch { return null }
}

export async function generateMetadata({ params }: { params: Promise<{ slug: string }> }): Promise<Metadata> {
  const { slug } = await params
  const article = await getArticle(slug)
  if (!article) return { title: 'Article Not Found | HomAroma' }
  return {
    title: `${article.title} | HomAroma Scent Guide`,
    description: article.content.replace(/<[^>]+>/g, '').slice(0, 160),
    openGraph: {
      title: article.title,
      images: article.coverImage ? [article.coverImage] : [],
      type: 'article',
      publishedTime: article.createdAt,
    },
  }
}

export default async function ArticleReaderPage({ params }: { params: Promise<{ slug: string }> }) {
  const { slug } = await params
  const article = await getArticle(slug)

  if (!article) notFound()

  return (
    <div className="min-h-screen flex flex-col bg-night-950">
      <main className="flex-1 pt-24 pb-20">
        <article className="max-w-4xl mx-auto w-full animate-fade-in relative mt-8">

          {/* Desktop back button */}
          <Link
            href="/scent-guide"
            className="absolute -left-16 xl:-left-24 top-0 mt-8 hidden lg:flex p-4 glass border border-white/5 rounded-full hover:bg-white/10 transition-colors"
          >
            <ArrowLeft className="w-5 h-5 text-slate-300" />
          </Link>

          {/* Header */}
          <div className="text-center px-6 py-12 space-y-6">
            <Link href="/scent-guide" className="lg:hidden text-slate-400 text-sm hover:text-white inline-flex items-center gap-2 mb-4">
              <ArrowLeft className="w-4 h-4" /> Go Back
            </Link>
            <p className="text-cyan-glow uppercase tracking-[0.3em] font-bold text-xs">
              {new Date(article.createdAt).toLocaleDateString('en-US', { month: 'long', day: 'numeric', year: 'numeric' })}
            </p>
            <h1 className="text-4xl md:text-5xl lg:text-6xl font-bold leading-tight max-w-3xl mx-auto font-serif">
              {article.title}
            </h1>
          </div>

          {/* Cover Image */}
          {article.coverImage && (
            <div className="w-full aspect-[16/7] bg-night-900 md:rounded-[2rem] overflow-hidden shadow-2xl mb-16 border border-white/5">
              <img src={article.coverImage} alt={article.title} className="w-full h-full object-cover" />
            </div>
          )}

          {/* Content Body */}
          <div className="px-6 md:px-12 prose prose-invert prose-lg prose-cyan mx-auto max-w-3xl pb-16">
            <div dangerouslySetInnerHTML={{ __html: article.content }} className="space-y-6" />
          </div>

        </article>
      </main>
    </div>
  )
}