"use client";

import { useEffect, useRef, useState } from "react";
import Link from "next/link";

type Preview = {
  slug: string;
  name: string;
  bio: string;
  logoUrl: string | null;
  website: string | null;
  hq: string;
  featured: boolean;
  exhibitsNab: boolean;
  exhibitsIbc: boolean;
  categories: string[];
  isActiveAdvertiser: boolean;
  stories: { slug: string; title: string; date: string | null; image: string | null }[];
};

const cache = new Map<string, Promise<Preview | null>>();

async function fetchPreview(slug: string): Promise<Preview | null> {
  if (cache.has(slug)) return cache.get(slug)!;
  const p = (async () => {
    try {
      const r = await fetch(`/api/public/companies/${encodeURIComponent(slug)}/preview`);
      if (!r.ok) return null;
      return (await r.json()) as Preview;
    } catch {
      return null;
    }
  })();
  cache.set(slug, p);
  return p;
}

/**
 * Mount once per page. Listens for hover/focus on any [data-company-slug]
 * element, fetches preview data, and pops a floating card.
 */
export default function CompanyMentionsHover() {
  const [anchor, setAnchor] = useState<HTMLElement | null>(null);
  const [preview, setPreview] = useState<Preview | null>(null);
  const [loading, setLoading] = useState(false);
  const [pos, setPos] = useState<{ top: number; left: number; align: "left" | "right" } | null>(null);
  const hideTimer = useRef<number | null>(null);
  const showTimer = useRef<number | null>(null);

  useEffect(() => {
    function onEnter(e: MouseEvent | FocusEvent) {
      const t = (e.target as HTMLElement | null)?.closest?.("[data-company-slug]") as HTMLElement | null;
      if (!t) return;
      if (hideTimer.current) { window.clearTimeout(hideTimer.current); hideTimer.current = null; }
      if (showTimer.current) window.clearTimeout(showTimer.current);
      showTimer.current = window.setTimeout(async () => {
        const slug = t.getAttribute("data-company-slug");
        if (!slug) return;
        setAnchor(t);
        setLoading(true);
        const data = await fetchPreview(slug);
        setLoading(false);
        if (!data) { setAnchor(null); return; }
        setPreview(data);
        const rect = t.getBoundingClientRect();
        const cardWidth = 360;
        const fitsRight = rect.left + cardWidth < window.innerWidth - 12;
        setPos({
          top: rect.bottom + window.scrollY + 6,
          left: fitsRight ? rect.left + window.scrollX : Math.max(12, rect.right + window.scrollX - cardWidth),
          align: fitsRight ? "left" : "right",
        });
      }, 220);
    }
    function onLeave(e: MouseEvent | FocusEvent) {
      const related = (e as MouseEvent).relatedTarget as HTMLElement | null;
      if (related && (related.closest?.("[data-company-card]") || related.closest?.("[data-company-slug]"))) return;
      if (showTimer.current) { window.clearTimeout(showTimer.current); showTimer.current = null; }
      if (hideTimer.current) window.clearTimeout(hideTimer.current);
      hideTimer.current = window.setTimeout(() => { setAnchor(null); setPreview(null); setPos(null); }, 180);
    }
    document.addEventListener("mouseover", onEnter, true);
    document.addEventListener("mouseout", onLeave, true);
    document.addEventListener("focusin", onEnter, true);
    document.addEventListener("focusout", onLeave, true);
    return () => {
      document.removeEventListener("mouseover", onEnter, true);
      document.removeEventListener("mouseout", onLeave, true);
      document.removeEventListener("focusin", onEnter, true);
      document.removeEventListener("focusout", onLeave, true);
    };
  }, []);

  if (!anchor || !pos) return null;

  return (
    <div
      data-company-card="true"
      role="dialog"
      aria-label={preview?.name ? `${preview.name} preview` : "Company preview"}
      style={{ position: "absolute", top: pos.top, left: pos.left, width: 360, zIndex: 999 }}
      className="bg-white text-ink border border-ink/10 rounded-xl shadow-2xl p-4 text-sm"
      onMouseEnter={() => { if (hideTimer.current) { window.clearTimeout(hideTimer.current); hideTimer.current = null; } }}
      onMouseLeave={() => { hideTimer.current = window.setTimeout(() => { setAnchor(null); setPreview(null); setPos(null); }, 180); }}
    >
      {loading || !preview ? (
        <div className="text-ink/50 text-xs py-2">Loading…</div>
      ) : (
        <>
          <div className="flex items-start gap-3 mb-2">
            {preview.logoUrl ? (
              /* eslint-disable-next-line @next/next/no-img-element */
              <img src={preview.logoUrl} alt="" className="w-12 h-12 rounded bg-ink/5 object-contain flex-shrink-0" loading="lazy" />
            ) : (
              <div className="w-12 h-12 rounded bg-ink/5 flex items-center justify-center text-ink/40 font-bold flex-shrink-0">
                {(preview.name || "?").trim().charAt(0).toUpperCase()}
              </div>
            )}
            <div className="min-w-0 flex-1">
              <Link href={`/manufacturers/${preview.slug}`} className="font-semibold text-ink hover:text-brand-primary block truncate">
                {preview.name}
              </Link>
              <div className="flex items-center gap-1.5 mt-0.5 flex-wrap text-[10px]">
                {preview.isActiveAdvertiser && (
                  <span className="bg-emerald-50 text-emerald-700 px-1.5 py-0.5 rounded font-semibold uppercase tracking-wider">Sponsor</span>
                )}
                {preview.exhibitsNab && (
                  <span className="bg-amber-50 text-amber-700 px-1.5 py-0.5 rounded font-semibold uppercase tracking-wider">2026 NAB Show</span>
                )}
                {preview.exhibitsIbc && (
                  <span className="bg-blue-50 text-blue-700 px-1.5 py-0.5 rounded font-semibold uppercase tracking-wider">IBC 2026</span>
                )}
                {preview.hq && <span className="text-ink/60">{preview.hq}</span>}
              </div>
            </div>
          </div>

          {preview.bio && (
            <p className="text-ink/70 text-xs leading-snug mb-3 line-clamp-4">{preview.bio}</p>
          )}

          {preview.stories.length > 0 && (
            <div className="border-t border-ink/10 pt-2">
              <div className="text-[10px] uppercase tracking-widest text-ink/50 font-bold mb-1.5">Recent coverage</div>
              <ul className="space-y-1">
                {preview.stories.slice(0, 3).map((s) => (
                  <li key={s.slug}>
                    <Link href={`/news/${s.slug}`} className="text-xs text-brand-primary hover:underline line-clamp-2">
                      {s.title}
                    </Link>
                    {s.date && <span className="text-[10px] text-ink/40 ml-1">· {new Date(s.date).toISOString().slice(0, 10)}</span>}
                  </li>
                ))}
              </ul>
            </div>
          )}

          <div className="border-t border-ink/10 mt-3 pt-2 flex items-center justify-between">
            <Link href={`/manufacturers/${preview.slug}`} className="text-xs font-semibold text-brand-primary hover:underline">
              Full profile →
            </Link>
            {preview.website && (
              <a href={preview.website} target="_blank" rel="noopener noreferrer" className="text-[10px] text-ink/50 hover:text-brand-primary">
                {preview.website.replace(/^https?:\/\//, "").replace(/\/$/, "")} ↗
              </a>
            )}
          </div>
        </>
      )}
    </div>
  );
}