import {useEffect, useRef, useState, type ReactNode, type RefObject} from 'react';
import {PlaceCategory, selectPublishable} from '@o2o/shared';
import {useSite} from '@site/lib/site-context';
import {
  bookingActionLabel,
  bookingLinks,
  channelLabel,
  isSectionEnabled,
  publicLinks,
  stayBookingView,
} from '@site/lib/derive';
import {isoDate, naverDirectionsUrl} from '@site/lib/format';
import {useScrollLock} from '@site/lib/ui/use-scroll-lock';
import {SongPlayer} from '@site/sections/SongPlayer';
import {BookingForm} from '../paper/BookingForm';
import {BOOK_EVENT} from '../paper/Rooms';
import {Sheet} from '../paper/Sheet';
import {ChatIcon, HOUSE_WORD, pad2, PhoneIcon, PinIcon, Wordmark} from './ui';
import '../kit/kit.css';
import './boutique.css';

type PageId = 'home' | 'area' | 'stay' | 'story';

const PAGE_HEAD: Record<Exclude<PageId, 'home'>, {en: string; title: string; note: string}> = {
  area: {
    en: 'Around',
    title: '지역 소개',
    note: '대문에서 걸어 닿는 자리와, 이 도시가 남긴 이야기입니다.',
  },
  stay: {
    en: 'Stay',
    title: '이용안내 · 예약',
    note: '객실 상세와 요금, 예약하는 방법입니다.',
  },
  story: {
    en: 'Story',
    title: '이야기',
    note: '사장님이 남기는 글과 다녀가신 분들의 후기, 그리고 엽서 한 장입니다.',
  },
};

const PAGE_EN: Record<PageId, string> = {home: 'The House', area: 'Around', stay: 'Stay', story: 'Story'};

function pageOf(hash: string): PageId {
  const id = hash.replace(/^#\/?/, '');
  return id === 'area' || id === 'stay' || id === 'story' ? id : 'home';
}

function usePage(): PageId {
  const [page, setPage] = useState<PageId>('home');
  useEffect(() => {
    const sync = () => {
      const {hash} = window.location;
      if (hash && !hash.startsWith('#/')) return;
      setPage(pageOf(hash));
      window.scrollTo({top: 0, behavior: 'instant'});
    };
    sync();
    window.addEventListener('hashchange', sync);
    const again = (event: MouseEvent) => {
      const link = event.target instanceof Element ? event.target.closest('a[href^="#/"]') : null;
      const href = link?.getAttribute('href');
      if (href && pageOf(href) === pageOf(window.location.hash)) window.scrollTo({top: 0, behavior: 'instant'});
    };
    document.addEventListener('click', again);
    return () => {
      window.removeEventListener('hashchange', sync);
      document.removeEventListener('click', again);
    };
  }, []);
  return page;
}

function useSolid(page: PageId): boolean {
  const [scrolled, setScrolled] = useState(false);
  useEffect(() => {
    const sync = () => setScrolled(window.scrollY > window.innerHeight * 0.8);
    sync();
    window.addEventListener('scroll', sync, {passive: true});
    return () => window.removeEventListener('scroll', sync);
  }, []);
  return page !== 'home' || scrolled;
}

function useReveal(root: RefObject<HTMLDivElement | null>, page: PageId) {
  useEffect(() => {
    const el = root.current;
    if (!el || !('IntersectionObserver' in window)) return;
    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;
    const seen = new WeakSet<Element>();
    const io = new IntersectionObserver(
      (entries) =>
        entries.forEach((entry) => {
          if (!entry.isIntersecting) return;
          entry.target.classList.add('show');
          io.unobserve(entry.target);
        }),
      {threshold: 0.12},
    );
    const scan = () => {
      el.querySelectorAll('.rv:not(.show)').forEach((node) => {
        if (seen.has(node)) return;
        seen.add(node);
        const box = node.getBoundingClientRect();
        if (box.height > 0 && box.top < window.innerHeight && box.bottom > 0) node.classList.add('show');
        else io.observe(node);
      });
    };
    scan();
    el.classList.add('rv-on');
    const mo = new MutationObserver(scan);
    mo.observe(el, {childList: true, subtree: true});
    return () => {
      mo.disconnect();
      io.disconnect();
    };
  }, [root, page]);
}

function useTabs() {
  const payload = useSite();
  const tabs: {label: string; page: PageId}[] = [
    {label: `${HOUSE_WORD[payload.place.category] ?? '가게'} 소개`, page: 'home'},
  ];
  if (isSectionEnabled(payload, 'local')) tabs.push({label: '지역 소개', page: 'area'});
  tabs.push({label: '이용안내 · 예약', page: 'stay'});
  tabs.push({label: '이야기', page: 'story'});
  return tabs;
}

export function Frame({children}: {children: ReactNode}) {
  const payload = useSite();
  const {place, site} = payload;
  const tabs = useTabs();
  const page = usePage();
  const solid = useSolid(page);
  const rootRef = useRef<HTMLDivElement>(null);
  const [menuOpen, setMenuOpen] = useState(false);
  const [bookingOpen, setBookingOpen] = useState(false);
  useReveal(rootRef, page);
  useScrollLock(menuOpen);
  useEffect(() => {
    const open = () => setBookingOpen(true);
    window.addEventListener(BOOK_EVENT, open);
    return () => window.removeEventListener(BOOK_EVENT, open);
  }, []);
  useEffect(() => setMenuOpen(false), [page]);
  useEffect(() => {
    if (!menuOpen) return;
    const onKey = (event: KeyboardEvent) => event.key === 'Escape' && setMenuOpen(false);
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [menuOpen]);

  const booking = bookingLinks(payload)[0];
  const stayBooking = place.category === PlaceCategory.LODGING ? stayBookingView(payload) : null;
  const kakao = payload.links.find((link) => link.confirmed && /kakao/i.test(link.url));
  const address = place.roadAddress ?? place.address;
  const facts = selectPublishable(payload.facts);
  const fact = (key: string) => facts.find((f) => f.key === key)?.value ?? undefined;
  const hours = [
    fact('check_in_time') && `체크인 ${fact('check_in_time')}`,
    fact('check_out_time') && `체크아웃 ${fact('check_out_time')}`,
    fact('smoking') === 'false' && '전 구역 금연',
  ].filter(Boolean);
  const channels = publicLinks(payload);
  const instagram = channels.find((link) => /instagram\.com/i.test(link.url));
  const areaPills = (
    [
      ['주변 명소', '#walk', payload.local.attractions.length > 0],
      ['주변 맛집', '#eat', payload.local.restaurants.length > 0],
      ['엽서', '#/story', true],
      ['축제', '#festival', isSectionEnabled(payload, 'festival') && payload.local.festivals.length > 0],
      ['일정', '#itinerary', isSectionEnabled(payload, 'itinerary')],
      ['이야기', '#story', isSectionEnabled(payload, 'story')],
      ['날씨', '#/', isSectionEnabled(payload, 'weather')],
    ] as [string, string, boolean][]
  ).filter(([, , on]) => on);
  const locality = place.addressLocality ?? place.addressRegion;
  const english = place.englishName?.trim();

  return (
    <div className="w4-boutique" data-page={page} ref={rootRef}>
      <header className={solid ? 'b-hd solid' : 'b-hd'}>
        <a className={english ? 'b-logo' : 'b-logo b-logo--ko'} href="#/">
          {english || place.name}
          {locality && <small>{locality}</small>}
        </a>
        <nav className="b-hnav" aria-label="페이지">
          {tabs.map((tab) => (
            <a
              key={tab.page}
              href={tab.page === 'home' ? '#/' : `#/${tab.page}`}
              className={tab.page === page ? 'on' : undefined}
              aria-current={tab.page === page ? 'page' : undefined}
            >
              {tab.label}
            </a>
          ))}
        </nav>
        <div className="b-hcta">
          {place.phone && (
            <a href={`tel:${place.phone}`}>
              <PhoneIcon />
              {place.phone}
            </a>
          )}
          {stayBooking ? (
            <button type="button" className="cta" onClick={() => setBookingOpen(true)}>
              예약하기
            </button>
          ) : (
            booking && (
              <a className="cta" href={booking.url} target="_blank" rel="noopener noreferrer">
                {bookingActionLabel(booking)}
              </a>
            )
          )}
        </div>
        <div className="b-hbtn">
          {place.phone && (
            <a className="b-circ" href={`tel:${place.phone}`} aria-label="전화 걸기">
              CALL
            </a>
          )}
          <button
            type="button"
            className="b-circ"
            aria-expanded={menuOpen}
            aria-controls="b-menu"
            onClick={() => setMenuOpen((was) => !was)}
          >
            {menuOpen ? 'CLOSE' : 'MENU'}
          </button>
        </div>
      </header>

      <nav className="b-menu" id="b-menu" aria-label="주요 메뉴" hidden={!menuOpen}>
        {tabs.map((tab, i) => (
          <a
            key={tab.page}
            href={tab.page === 'home' ? '#/' : `#/${tab.page}`}
            className={tab.page === page ? 'on' : undefined}
            aria-current={tab.page === page ? 'page' : undefined}
            onClick={() => setMenuOpen(false)}
          >
            <span className="b-menu-no">{pad2(i + 1)}</span>
            <span className="b-menu-en">{PAGE_EN[tab.page]}</span>
            <span className="b-menu-ko">{tab.label}</span>
          </a>
        ))}
      </nav>

      {(Object.keys(PAGE_HEAD) as Exclude<PageId, 'home'>[]).map((id) => (
        <div key={id} data-pg={id}>
          <section className="b-phead">
            <p className="b-phead-en">{PAGE_HEAD[id].en}</p>
            <p className="b-phead-ko">
              {id === 'area' ? (place.addressLocality?.replace(/(시|군)$/, '') ?? PAGE_HEAD.area.title) : PAGE_HEAD[id].title}
            </p>
            <p className="b-phead-note">{PAGE_HEAD[id].note}</p>
            {id === 'area' && areaPills.length > 0 && (
              <div className="b-pills">
                {areaPills.map(([label, href]) => (
                  <a key={href} className="b-pill" href={href}>
                    {label}
                  </a>
                ))}
              </div>
            )}
          </section>
        </div>
      ))}

      {children}

      {channels.length > 0 && (
        <div data-pg="stay">
          <section className="b-sec" id="channels" aria-labelledby="channels-heading">
            <div className="b-sh">
              <p className="b-sh-en" aria-hidden>
                Channels
              </p>
              <h2 className="b-sh-ko" id="channels-heading">
                공식 채널
              </h2>
            </div>
            <div className="b-list">
              {channels.map((link) => (
                <a key={link.url} className="b-row" href={link.url} target="_blank" rel="noopener noreferrer">
                  <span>{channelLabel(link)}</span>
                  <span className="r">OPEN ↗</span>
                </a>
              ))}
            </div>
          </section>
        </div>
      )}

      <footer className="b-ft">
        <Wordmark className="b-ft-big" name={place.name} english={english} />
        <p>
          {place.name}
          {address && ` · ${address}`}
        </p>
        {hours.length > 0 && <p>{hours.join(' · ')}</p>}
        {(place.phone || instagram) && (
          <p>
            {place.phone && <a href={`tel:${place.phone}`}>{place.phone}</a>}
            {place.phone && instagram && ' · '}
            {instagram && (
              <a href={instagram.url} target="_blank" rel="noopener noreferrer">
                instagram
              </a>
            )}
          </p>
        )}
        {place.legal?.businessRegistrationNumber && (
          <p>
            {place.legal.representative && `대표 ${place.legal.representative} · `}
            사업자등록번호 {place.legal.businessRegistrationNumber}
            {place.legal.mailOrderNumber && ` · 통신판매업신고 ${place.legal.mailOrderNumber}`}
          </p>
        )}
        <p className="byline credit">
          <span className="author">작성·운영 {place.name}</span> · 최종 업데이트{' '}
          <time dateTime={site.updatedAt}>{isoDate(site.updatedAt)}</time>
          <br />
          <a href="https://www.o2osolution.ai/" target="_blank" rel="noopener noreferrer">
            AI O2O
          </a>
          의 Web4Ai로 만든 사이트입니다.
        </p>
      </footer>

      <div className="b-player">
        <SongPlayer />
      </div>

      <nav className="b-bar" aria-label="연락 · 예약">
        {address && (
          <a href={naverDirectionsUrl(place.name, place.latitude, place.longitude)} target="_blank" rel="noopener noreferrer nofollow">
            <PinIcon />
            오시는 길
          </a>
        )}
        {kakao && (
          <a href={kakao.url} target="_blank" rel="noopener noreferrer" aria-label={channelLabel(kakao)}>
            <ChatIcon />
            카톡
          </a>
        )}
        {place.phone && (
          <a href={`tel:${place.phone}`}>
            <PhoneIcon />
            전화
          </a>
        )}
        {stayBooking ? (
          <button type="button" className="cta" onClick={() => setBookingOpen(true)}>
            BOOK
            <small>예약하기</small>
          </button>
        ) : (
          booking && (
            <a className="cta" href={booking.url} target="_blank" rel="noopener noreferrer">
              BOOK
              <small>{bookingActionLabel(booking)}</small>
            </a>
          )
        )}
      </nav>

      {stayBooking && (
        <Sheet open={bookingOpen} onClose={() => setBookingOpen(false)} label="예약 요청" plain>
          <div className="b-bookbox">
            <p className="b-cap">Reservation</p>
            <h3>예약 요청하기</h3>
            <BookingForm />
          </div>
        </Sheet>
      )}
    </div>
  );
}