import Link from 'next/link';
import { formatDate } from '@/lib/markdown';
import { Clock } from 'lucide-react';
import ArticleCoverSVG from './ArticleCoverSVG';

const CATEGORY_META = {
  'ai-tools':   { label: 'AI Tools',   cls: 'bg-emerald-50 dark:bg-emerald-950/60 text-emerald-700 dark:text-emerald-300 border-emerald-200 dark:border-emerald-900' },
  'cybersec':   { label: 'Cybersec',   cls: 'bg-red-50 dark:bg-red-950/60 text-red-700 dark:text-red-300 border-red-200 dark:border-red-900' },
  'automation': { label: 'Automation', cls: 'bg-amber-50 dark:bg-amber-950/60 text-amber-700 dark:text-amber-300 border-amber-200 dark:border-amber-900' },
  'ai-dev':     { label: 'AI Dev',     cls: 'bg-blue-50 dark:bg-blue-950/60 text-blue-700 dark:text-blue-300 border-blue-200 dark:border-blue-900' },
};

/**
 * Отдать список «человеческих» тегов без дублей и без category-slug.
 */
function cleanTags(tags, category) {
  if (!Array.isArray(tags)) return [];
  const seen = new Set();
  const out = [];
  const catLower = (category || '').toLowerCase();
  for (const raw of tags) {
    if (typeof raw !== 'string') continue;
    const t = raw.trim();
    if (!t) continue;
    const lower = t.toLowerCase();
    if (lower === catLower) continue;
    if (seen.has(lower)) continue;
    seen.add(lower);
    out.push(t);
  }
  return out;
}

function CategoryBadge({ category }) {
  if (!category) return null;
  const meta = CATEGORY_META[category] || { label: category, cls: 'bg-neutral-100 dark:bg-neutral-800 text-neutral-700 dark:text-neutral-300 border-neutral-200 dark:border-neutral-700' };
  // Просто бейдж без вложенной ссылки — карточка целиком кликабельна.
  return (
    <span
      className={`inline-flex items-center text-[11px] font-medium px-2 py-0.5 rounded-full border ${meta.cls}`}
    >
      {meta.label}
    </span>
  );
}

function imageUrl(article) {
  if (!article.cover_url) return null;
  return article.cover_url;
}

/**
 * ArticleCard — карточка статьи в трёх размерах.
 *   - size="hero": большая, 5/3 grid (для главной)
 *   - size="regular": обычная карточка (для сеток 3-в-ряд)
 *   - size="compact": плотная (для вертикальных лент / sidebar)
 *
 * featured prop оставлен для обратной совместимости (= size="hero").
 */
export default function ArticleCard({ article, featured = false, size = 'regular' }) {
  const effectiveSize = featured ? 'hero' : size;
  const img = imageUrl(article);
  const tags = cleanTags(article.tags, article.category);

  if (effectiveSize === 'hero') {
    return (
      <Link href={`/blog/${article.slug}`} className="article-card block group overflow-hidden p-0">
        <div className="flex flex-col sm:grid sm:grid-cols-5 sm:gap-0">
          <div className="p-3 sm:p-5 sm:col-span-2">
            {img ? (
              <img
                src={img}
                alt={article.title}
                className="w-full aspect-[16/9] sm:aspect-square object-cover rounded-xl"
                loading="eager"
              />
            ) : (
              <ArticleCoverSVG article={article} aspect="16/9" className="sm:!aspect-square" />
            )}
          </div>
          <div className="p-5 sm:p-8 sm:col-span-3 flex flex-col justify-center">
            <div className="flex flex-wrap items-center gap-2 mb-3">
              <CategoryBadge category={article.category} />
              {tags.slice(0, 3).map(t => (
                <span key={t} className="tag">#{t}</span>
              ))}
            </div>
            <h2 className="text-xl sm:text-3xl font-bold mb-3 leading-tight ink group-hover:accent transition-colors">
              {article.title}
            </h2>
            {article.excerpt && (
              <p className="mute text-sm sm:text-base leading-relaxed line-clamp-3 mb-4">
                {article.excerpt}
              </p>
            )}
            <div className="flex items-center gap-3 text-xs mute">
              <span>{formatDate(article.published_at)}</span>
              {article.reading_time && (
                <span className="inline-flex items-center gap-1">
                  <Clock className="w-3 h-3" /> {article.reading_time} мин
                </span>
              )}
            </div>
          </div>
        </div>
      </Link>
    );
  }

  if (effectiveSize === 'compact') {
    return (
      <Link href={`/blog/${article.slug}`} className="article-card group flex gap-3 items-start p-3">
        <div className="shrink-0 w-20 h-20 rounded-lg overflow-hidden bg-neutral-100 dark:bg-neutral-800">
          {img ? (
            <img src={img} alt={article.title} className="w-full h-full object-cover" loading="lazy" />
          ) : (
            <ArticleCoverSVG article={article} aspect="1/1" />
          )}
        </div>
        <div className="flex-1 min-w-0">
          <div className="mb-1.5"><CategoryBadge category={article.category} /></div>
          <h3 className="text-sm font-semibold mb-1 ink group-hover:accent transition-colors leading-snug line-clamp-2">
            {article.title}
          </h3>
          <div className="flex items-center gap-2 text-[11px] mute">
            <span>{formatDate(article.published_at)}</span>
            {article.reading_time && (
              <span className="inline-flex items-center gap-1">
                <Clock className="w-3 h-3" /> {article.reading_time} мин
              </span>
            )}
          </div>
        </div>
      </Link>
    );
  }

  // regular
  return (
    <Link href={`/blog/${article.slug}`} className="article-card block group overflow-hidden p-0">
      <div className="p-3">
        {img ? (
          <img src={img} alt={article.title} className="w-full aspect-[16/9] object-cover rounded-lg" loading="lazy" />
        ) : (
          <ArticleCoverSVG article={article} />
        )}
      </div>
      <div className="p-4 sm:p-5 pt-2">
        <div className="flex flex-wrap items-center gap-2 mb-2">
          <CategoryBadge category={article.category} />
          {tags.slice(0, 2).map(t => (
            <span key={t} className="tag">#{t}</span>
          ))}
        </div>
        <h3 className="text-base sm:text-lg font-semibold mb-2 ink group-hover:accent transition-colors leading-snug line-clamp-2">
          {article.title}
        </h3>
        {article.excerpt && (
          <p className="mute text-sm line-clamp-2 mb-4">{article.excerpt}</p>
        )}
        <div className="flex items-center gap-3 text-xs mute">
          <span>{formatDate(article.published_at)}</span>
          {article.reading_time && (
            <span className="inline-flex items-center gap-1">
              <Clock className="w-3 h-3" /> {article.reading_time} мин
            </span>
          )}
        </div>
      </div>
    </Link>
  );
}