'use client';
import { useEffect } from 'react';
import { useParams, useRouter } from 'next/navigation';
import Link from 'next/link';
import { motion } from 'framer-motion';
import { useBlogPost } from '../../../services/blog';
import { assetUrl } from '../../../services/api';
import Loader from '../../../components/Loader';

function renderContent(content: string) {
  return content.split('\n').map((line, i) => {
    if (line.startsWith('# '))
      return <h2 key={i} style={{ fontSize: '1.5rem', fontWeight: 700, color: '#0a0a0a', marginTop: '2rem', marginBottom: '0.5rem', lineHeight: 1.3 }}>{line.slice(2)}</h2>;
    if (line.startsWith('## '))
      return <h3 key={i} style={{ fontSize: '1.15rem', fontWeight: 600, color: '#1a1a1a', marginTop: '1.5rem', marginBottom: '0.4rem' }}>{line.slice(3)}</h3>;
    if (line.startsWith('- '))
      return <li key={i} style={{ color: '#4a4744', lineHeight: 1.8, marginLeft: '1.2rem', listStyleType: 'disc' }}>{line.slice(2)}</li>;
    if (line.trim() === '')
      return <br key={i} />;
    return <p key={i} style={{ color: '#4a4744', lineHeight: 1.85, marginBottom: '0.25rem' }}>{line}</p>;
  });
}

export default function ArticlePage() {
  const params = useParams();
  const router = useRouter();
  const slug = typeof params.slug === 'string' ? params.slug : params.slug?.[0] ?? '';

  const { data: post, isLoading, isError } = useBlogPost(slug);

  useEffect(() => {
    if (post) document.title = `${post.title} | Blog`;
  }, [post]);

  if (isLoading) return <Loader className="py-40" />;
  if (isError || !post) {
    return (
      <main style={{ minHeight: '80vh', display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', gap: 16 }}>
        <p style={{ color: '#aaa8a4', fontSize: 14, fontFamily: 'monospace', letterSpacing: '0.1em' }}>ARTÍCULO NO ENCONTRADO</p>
        <button onClick={() => router.push('/blog')}
          style={{ color: '#3b82f6', fontSize: 14, textDecoration: 'underline', background: 'none', border: 'none', cursor: 'pointer' }}>
          Volver al blog
        </button>
      </main>
    );
  }

  const imageUrl = assetUrl(post.imageUrl);
  const publishDate = post.publishedAt
    ? new Date(post.publishedAt).toLocaleDateString('es-MX', { day: '2-digit', month: 'long', year: 'numeric' })
    : null;

  return (
    <main id="main-content">
      {/* Hero */}
      <section style={{ background: '#ffffff', borderBottom: '1px solid #dddbd5', paddingTop: '140px', paddingBottom: '60px' }}
        className="px-8 md:px-14">
        <div className="mx-auto" style={{ maxWidth: '780px' }}>
          <motion.div initial={{ opacity: 0, y: 20 }} animate={{ opacity: 1, y: 0 }} transition={{ duration: 0.5 }}>
            {/* Breadcrumb */}
            <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 28, fontFamily: 'monospace', fontSize: 11, letterSpacing: '0.14em', color: '#aaa8a4' }}>
              <Link href="/blog" style={{ color: '#3b82f6', textDecoration: 'none' }}>BLOG</Link>
              <span>/</span>
              <span style={{ color: '#aaa8a4', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', maxWidth: '40ch' }}>
                {post.category.toUpperCase()}
              </span>
            </div>

            {/* Categoría */}
            <span style={{ display: 'inline-block', background: '#3b82f6', color: '#fff', fontFamily: 'monospace', fontSize: 10, letterSpacing: '0.14em', padding: '3px 10px', borderRadius: 2, marginBottom: 20 }}>
              {post.category.toUpperCase()}
            </span>

            {/* Título */}
            <h1 style={{ fontSize: 'clamp(1.8rem, 4vw, 2.8rem)', fontWeight: 700, color: '#0a0a0a', lineHeight: 1.2, marginBottom: 20 }}>
              {post.title}
            </h1>

            {/* Resumen */}
            {post.summary && (
              <p style={{ fontSize: '1.1rem', color: '#6a6866', lineHeight: 1.7, marginBottom: 28, borderLeft: '3px solid #dddbd5', paddingLeft: 16 }}>
                {post.summary}
              </p>
            )}

            {/* Meta */}
            <div style={{ display: 'flex', alignItems: 'center', gap: 16, paddingTop: 20, borderTop: '1px solid #dddbd5' }}>
              {post.authorName && (
                <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                  <div style={{ width: 32, height: 32, borderRadius: '50%', background: 'linear-gradient(135deg,#3b82f6,#6366f1)', display: 'flex', alignItems: 'center', justifyContent: 'center', color: '#fff', fontSize: 13, fontWeight: 700 }}>
                    {post.authorName.charAt(0).toUpperCase()}
                  </div>
                  <span style={{ fontSize: 14, fontWeight: 500, color: '#2a2a2a' }}>{post.authorName}</span>
                </div>
              )}
              {publishDate && (
                <>
                  {post.authorName && <span style={{ color: '#dddbd5' }}>·</span>}
                  <span style={{ fontFamily: 'monospace', fontSize: 11, color: '#aaa8a4', letterSpacing: '0.1em' }}>
                    {publishDate.toUpperCase()}
                  </span>
                </>
              )}
            </div>
          </motion.div>
        </div>
      </section>

      {/* Imagen de portada */}
      {imageUrl && (
        <div style={{ background: '#f0efec', borderBottom: '1px solid #dddbd5' }}>
          <div className="mx-auto" style={{ maxWidth: '1100px', padding: '0 2rem' }}>
            <motion.div initial={{ opacity: 0, scale: 0.98 }} animate={{ opacity: 1, scale: 1 }} transition={{ duration: 0.6, delay: 0.15 }}
              style={{ overflow: 'hidden', borderRadius: 4, aspectRatio: '16/7', marginTop: -1 }}>
              <img src={imageUrl} alt={post.title} style={{ width: '100%', height: '100%', objectFit: 'cover' }} />
            </motion.div>
          </div>
        </div>
      )}

      {/* Contenido */}
      <section style={{ background: '#f5f5f3', borderBottom: '1px solid #dddbd5', padding: '80px 0' }}
        className="px-8 md:px-14">
        <motion.div className="mx-auto" style={{ maxWidth: '780px' }}
          initial={{ opacity: 0, y: 24 }} animate={{ opacity: 1, y: 0 }} transition={{ duration: 0.6, delay: 0.2 }}>
          <div style={{ background: '#ffffff', border: '1px solid #dddbd5', borderRadius: 4, padding: '48px 52px', fontSize: '1rem', lineHeight: 1.85 }}>
            {renderContent(post.content)}
          </div>

          {/* Volver */}
          <div style={{ marginTop: 48, paddingTop: 32, borderTop: '1px solid #dddbd5' }}>
            <Link href="/blog"
              style={{ display: 'inline-flex', alignItems: 'center', gap: 8, fontFamily: 'monospace', fontSize: 11, letterSpacing: '0.14em', color: '#3b82f6', textDecoration: 'none' }}>
              ← VOLVER AL BLOG
            </Link>
          </div>
        </motion.div>
      </section>
    </main>
  );
}