import {useEffect, useState} from 'react';
import {HeroCatchphrase} from '@site/sections/HeroCatchphrase';
import {useSite} from '@site/lib/site-context';
import {bookingActionLabel, bookingLinks, isSectionEnabled, stayBookingView} from '@site/lib/derive';
import {PlaceCategory} from '@o2o/shared';
import {heroSub} from '../kit/heroSub';
import {BOOK_EVENT} from '../paper/Rooms';
import {pad2} from './ui';
import {Weather} from './Weather';

const MAX_SLIDES = 5;

export function Hero() {
  const payload = useSite();
  const {place, narrative} = payload;
  const slides = [...payload.media]
    .filter((image) => image.alt?.trim())
    .sort((a, b) => Number(b.isPrimary) - Number(a.isPrimary))
    .slice(0, MAX_SLIDES);
  const [index, setIndex] = useState(0);
  const total = slides.length;
  useEffect(() => {
    if (total < 2) return;
    const motion = window.matchMedia('(prefers-reduced-motion: reduce)');
    const timer = window.setInterval(() => {
      if (!document.hidden && !motion.matches) setIndex((was) => (was + 1) % total);
    }, 5000);
    return () => window.clearInterval(timer);
  }, [total]);
  const sub = heroSub(payload);
  const english = place.englishName?.trim();
  const locality = [place.addressLocality, place.addressRegion].find(Boolean);
  const stayBooking = place.category === PlaceCategory.LODGING ? stayBookingView(payload) : null;
  const booking = bookingLinks(payload)[0];

  return (
    <>
      <section
        className={total > 0 ? 'b-hero' : 'b-hero b-hero--plain'}
        id="top"
        data-pg="home"
        role="region"
        aria-roledescription="carousel"
        aria-label={`${place.name} 사진`}
      >
        {slides.map((image, i) => (
          <div key={image.mediaId} className={i === index ? 'b-slide on' : 'b-slide'} aria-hidden={i !== index}>
            <img
              src={image.url}
              alt={image.alt}
              fetchPriority={i === 0 ? 'high' : 'low'}
              loading={i === 0 ? undefined : 'lazy'}
              decoding="async"
            />
          </div>
        ))}
        <div className="b-hero-copy">
          {english && <p className="b-hero-en">{english}</p>}
          <h1 className={english ? 'b-hero-name' : 'b-hero-name b-hero-name--solo'}>{place.name}</h1>
          {locality && <p className="b-hero-loc">{locality}</p>}
          <p className="b-hero-cp">
            <HeroCatchphrase />
          </p>
          {sub && <p className="b-hero-ko">{sub}</p>}
          <div className="b-hero-act">
            {stayBooking ? (
              <button type="button" className="btn" onClick={() => window.dispatchEvent(new Event(BOOK_EVENT))}>
                예약하기
              </button>
            ) : (
              booking && (
                <a className="btn" href={booking.url} target="_blank" rel="noopener noreferrer">
                  {bookingActionLabel(booking)}
                </a>
              )
            )}
            <a className="btn ghost" href="#/stay">
              이용안내 보기
            </a>
          </div>
        </div>
        {total > 1 && (
          <p className="b-hero-count" aria-live="polite">
            <span>{pad2(index + 1)}</span> &nbsp;/&nbsp; {pad2(total)}
          </p>
        )}
      </section>
      {isSectionEnabled(payload, 'weather') && (
        <div data-editor-id="weather" style={{display: 'contents'}}>
          <Weather />
        </div>
      )}
    </>
  );
}