import { useState, useEffect } from 'react'
import { useParams, Link } from 'react-router-dom'
import { API_BASE, type Article, type Category } from '../types'
import Navbar from '../components/Navbar'
import Footer from '../components/Footer'
import { ArrowLeft, Loader2 } from 'lucide-react'

export default function ArticleReaderPage() {
  const { slug } = useParams()
  const [article, setArticle] = useState<Article | null>(null)
  const [categories, setCategories] = useState<Category[]>([])
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    fetch(`${API_BASE}/categories`).then(r => r.json()).then(setCategories).catch(console.error)
    fetch(`${API_BASE}/articles/${slug}`)
      .then(res => {
         if (!res.ok) throw new Error()
         return res.json()
      })
      .then(setArticle)
      .catch(() => setArticle(null))
      .finally(() => setLoading(false))
  }, [slug])

  if (loading) return (
    <div className="min-h-screen flex items-center justify-center bg-black">
      <Loader2 className="w-8 h-8 animate-spin text-cyan-glow" />
    </div>
  )

  if (!article) return (
    <div className="min-h-screen flex flex-col bg-black">
      <Navbar categories={categories} />
      <div className="flex-1 flex flex-col items-center justify-center px-6 text-center space-y-4">
        <h1 className="text-4xl font-bold">Article not found</h1>
        <Link to="/scent-guide" className="btn-secondary px-6 py-3">Return to Scent Guide</Link>
      </div>
      <Footer categories={categories} />
    </div>
  )

  return (
    <div className="min-h-screen flex flex-col bg-night-950">
      <Navbar categories={categories} />

      <main className="flex-1 pt-24 pb-20">
        <article className="max-w-4xl mx-auto w-full animate-fade-in relative mt-8">
          
          <Link to="/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 to="/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>

      <Footer categories={categories} />
    </div>
  )
}