import {useState} from 'react';
import {factText, sanitizeUnits} from '@o2o/shared';
import {useSite} from '@site/lib/site-context';
import {sectionName, unitSpec, unitViews, type UnitView} from '@site/lib/derive';
import {Car} from '../paper/Car';
import {BOOK_EVENT} from '../paper/Rooms';
import {Sheet} from '../paper/Sheet';
import {RoomArt} from './Art';

const HOME_UNITS = 4;

function splitName(name: string): [string, string | undefined] {
  const m = /^(.+?)\s*\((.+)\)\s*$/.exec(name);
  return m ? [m[1], m[2]] : [name, undefined];
}

function specRows(unit: UnitView, facts: Parameters<typeof factText>[0]) {
  const bed = [factText(facts, 'bed_type'), factText(facts, 'room_size')].filter(Boolean).join(' · ');
  const std = factText(facts, 'standard_capacity');
  const max = factText(facts, 'max_capacity');
  const people = [std && `기준 ${std.replace(/명$/, '인')}`, max && `최대 ${max.replace(/명$/, '인')}`]
    .filter(Boolean)
    .join(' · ');
  const price = unit.priceText ?? unit.prices.map((p) => `${p.label} ${p.value}`).join(' · ');
  return [
    ['침대', bed],
    ['정원', people],
    ['요금', price],
  ].filter(([, value]) => value) as [string, string][];
}

function Cover({unit, index}: {unit: UnitView; index: number}) {
  const image = unit.images[0];
  if (!image) return <RoomArt night={index % 2 === 1} />;
  return (
    <div className="art">
      <img src={image.url} alt={image.alt} loading="lazy" />
    </div>
  );
}

function UnitSheet({unit, onClose}: {unit: UnitView | null; onClose: () => void}) {
  return (
    <Sheet open={unit != null} onClose={onClose} label={unit?.name ?? ''}>
      {unit && (
        <>
          {unit.images[0] && <img src={unit.images[0].url} alt={unit.images[0].alt} style={{aspectRatio: '3 / 2'}} />}
          <h3>{unit.name}</h3>
          {unit.intro && <p>{unit.intro}</p>}
          {unit.rows.map((row) => (
            <p key={row.label}>
              {row.label} — {row.value}
            </p>
          ))}
        </>
      )}
    </Sheet>
  );
}

export function Rooms() {
  const payload = useSite();
  const units = unitViews(payload);
  const spec = unitSpec(payload);
  const raw = new Map(sanitizeUnits(payload.units).map((unit) => [unit.unitId, unit]));
  const [open, setOpen] = useState<UnitView | null>(null);
  if (units.length === 0) return null;

  return (
    <>
      <div data-pg="home">
        <section className="sec" id="units" aria-labelledby="units-heading">
          <span className="bub">{spec.label}</span>
          <h2 id="units-heading" className="disp">
            {sectionName(payload, spec.path, `${spec.label} 안내`)}
          </h2>
          <div className="rgrid">
            {units.slice(0, HOME_UNITS).map((unit, i) => {
              const people = specRows(unit, raw.get(unit.unitId)?.facts ?? []).find(([label]) => label === '정원')?.[1];
              return (
                <a key={unit.unitId} href="#/stay" className="rcard">
                  <Cover unit={unit} index={i} />
                  <b className="nm">{unit.name}</b>
                  {people && <span className="ds">{people}</span>}
                </a>
              );
            })}
          </div>
          <a className="more" href="#/stay">
            이용안내에서 전체 보기
          </a>
        </section>
      </div>

      <div data-pg="stay" className="units">
        {units.map((unit, i) => {
          const [main, sub] = splitName(unit.name);
          return (
            <section key={unit.unitId} className="sec" id={`unit-${unit.slug}`}>
              <span className="bub">
                {spec.label} {String.fromCharCode(65 + i)}
              </span>
              <h2 className="disp">
                {main} {sub && <span>{sub}</span>}
              </h2>
              <div className="room room--full">
                {unit.images.length > 1 ? (
                  <Car
                    label={`${main} 사진`}
                    arrows
                    count
                    dots
                    slides={unit.images.map((image) => (
                      <img
                        key={image.mediaId}
                        src={image.url}
                        alt={image.alt}
                        loading="lazy"
                        style={{aspectRatio: '3 / 2'}}
                      />
                    ))}
                  />
                ) : (
                  <Cover unit={unit} index={i} />
                )}
                <div className="bd">
                  {unit.intro && <p className="lead">{unit.intro}</p>}
                  <dl className="spec">
                    {specRows(unit, raw.get(unit.unitId)?.facts ?? []).map(([label, value]) => (
                      <div key={label} style={{display: 'contents'}}>
                        <dt>{label}</dt>
                        <dd>{value}</dd>
                      </div>
                    ))}
                  </dl>
                  <button type="button" className="more" onClick={() => setOpen(unit)}>
                    {main} 자세히
                  </button>
                  <button type="button" className="cta" onClick={() => window.dispatchEvent(new Event(BOOK_EVENT))}>
                    {main} 예약 요청
                  </button>
                </div>
              </div>
            </section>
          );
        })}
      </div>

      <UnitSheet unit={open} onClose={() => setOpen(null)} />
    </>
  );
}