import type { DiscoverExpert } from "@/lib/discover";
import { initials } from "@/lib/feed-model";

function Rating({ rating, reviews }: { rating: number | null; reviews: number | null }) {
  if (rating === null && reviews === null) return null;
  return (
    <span className="rail-meta">
      {rating !== null ? <span aria-label={`Rated ${rating.toFixed(1)} out of 5`}>★ {rating.toFixed(1)}</span> : null}
      {reviews !== null ? <span> ({reviews} {reviews === 1 ? "review" : "reviews"})</span> : null}
    </span>
  );
}

export function FeaturedExpertsRail({ experts }: { experts: DiscoverExpert[] }) {
  if (experts.length === 0) return null;
  return (
    <section className="rail" aria-labelledby="rail-experts">
      <h2 id="rail-experts">Featured experts</h2>
      <ul className="rail-list">
        {experts.map((e) => (
          <li key={String(e.id)} className="rail-card expert-card" data-testid="expert-card">
            {e.pictureUrl ? (
              // eslint-disable-next-line @next/next/no-img-element
              <img className="avatar" src={e.pictureUrl} alt="" width={40} height={40} />
            ) : (
              <span className="avatar avatar-initials" aria-hidden="true">{initials(e.displayName)}</span>
            )}
            <div className="rail-text">
              <strong className="rail-name">{e.displayName || "Expert"}</strong>
              {e.byline ? <span className="rail-byline">{e.byline}</span> : null}
              <Rating rating={e.rating} reviews={e.reviewsCount} />
            </div>
          </li>
        ))}
      </ul>
    </section>
  );
}