import {useState} from 'react';
import {factText, sanitizeUnits, PlaceCategory} 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';

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][];
}

const HOME_MAX = 4;

export function Rooms() {
  const payload = useSite();
  const lodging = payload.place.category === PlaceCategory.LODGING;
  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;
  const rowsOf = (unit: UnitView) => specRows(unit, raw.get(unit.unitId)?.facts ?? []);
  const people = (unit: UnitView) => rowsOf(unit).find(([label]) => label === '정원')?.[1];

  return (
    <>
      <div data-pg="home">
        <section className="sec" id="units" aria-labelledby="units-heading">
          <p className="kicker">{spec.label}</p>
          <h2 id="units-heading">{sectionName(payload, spec.path, `${spec.label} 안내`)}</h2>
          <div className="rooms">
            {units.slice(0, HOME_MAX).map((unit) => (
              <a key={unit.unitId} href="#/stay" className="room room--mini">
                {unit.images[0] && (
                  <div className="ph">
                    <img src={unit.images[0].url} alt={unit.images[0].alt} loading="lazy" />
                  </div>
                )}
                <div className="bd">
                  <h3>{unit.name}</h3>
                  {people(unit) && <p>{people(unit)}</p>}
                </div>
              </a>
            ))}
          </div>
          <a href="#/stay" className="more">
            이용안내에서 전체 보기
          </a>
        </section>
      </div>

      <div data-pg="stay">
        {units.map((unit, i) => {
          const [main, sub] = splitName(unit.name);
          return (
            <section key={unit.unitId} className="sec" id={`unit-${unit.slug}`}>
              <p className="kicker">
                {spec.label} {String.fromCharCode(65 + i)}
              </p>
              <h2>
                {main} {sub && <span className="sub">{sub}</span>}
              </h2>
              <div className="room room--full">
                {unit.images.length > 0 && (
                  <Car
                    label={`${main} 사진`}
                    arrows
                    count
                    dots
                    slides={unit.images.map((image) => (
                      <img key={image.mediaId} src={image.url} alt={image.alt} loading="lazy" />
                    ))}
                  />
                )}
                <div className="bd">
                  {unit.intro && <p className="intro">{unit.intro}</p>}
                  <dl className="spec">
                    {rowsOf(unit).map(([label, value]) => (
                      <div key={label} style={{display: 'contents'}}>
                        <dt>{label}</dt>
                        <dd>{value}</dd>
                      </div>
                    ))}
                  </dl>
                  <div className="btnrow">
                    <button type="button" className="btn ghost" onClick={() => setOpen(unit)}>
                      자세히
                    </button>
                    {lodging && (
                      <button type="button" className="btn" onClick={() => window.dispatchEvent(new Event(BOOK_EVENT))}>
                        예약 요청
                      </button>
                    )}
                  </div>
                </div>
              </div>
            </section>
          );
        })}
      </div>

      <Sheet open={open != null} onClose={() => setOpen(null)} label={open?.name ?? ''}>
        {open && (
          <>
            {open.images[0] && <img src={open.images[0].url} alt={open.images[0].alt} />}
            <h3>{open.name}</h3>
            {open.intro && <p>{open.intro}</p>}
            {open.rows.map((row) => (
              <p key={row.label}>
                {row.label} — {row.value}
              </p>
            ))}
          </>
        )}
      </Sheet>
    </>
  );
}