import {useState, type ReactNode} from 'react';
import type {ChronicleItem, PeopleItem, ReadingItem, SongItem} from '@o2o/shared';
import {useSite} from '@site/lib/site-context';
import {sectionItems, sectionName} from '@site/lib/derive';
import {PhotoCard} from '../kit/Card';
import {Sheet} from './Sheet';

const COUNT_WORD: Record<number, string> = {1: '한', 2: '두', 3: '세', 4: '네'};

function More({rest, unit, children}: {rest: number; unit: string; children: ReactNode}) {
  if (rest <= 0) return null;
  return (
    <details>
      <summary className="more" style={{display: 'flex', alignItems: 'center', justifyContent: 'center'}}>
        {rest}
        {unit} 더 보기
      </summary>
      {children}
    </details>
  );
}

interface Open {
  title: string;
  meta?: string;
  body?: string;
  image?: string;
}

export function Story() {
  const payload = useSite();
  const region = payload.place.addressLocality?.replace(/시$|군$/, '') ?? '지역';
  const songs = sectionItems<SongItem>(payload, 'songs');
  const people = sectionItems<PeopleItem>(payload, 'people');
  const chronicle = sectionItems<ChronicleItem>(payload, 'chronicle');
  const reading = sectionItems<ReadingItem>(payload, 'reading');
  const [open, setOpen] = useState<Open | null>(null);
  const parts = [
    songs.items.length > 0 && '노래',
    people.items.length > 0 && '인물',
    chronicle.items.length > 0 && '연표',
    reading.items.length > 0 && '읽기',
  ].filter(Boolean) as string[];
  if (parts.length === 0) return null;

  const peopleSorted = [...people.items].sort((a, b) => Number(Boolean(b.imageUrl)) - Number(Boolean(a.imageUrl)));
  const withPhoto = people.items.filter((p) => p.imageUrl).length;

  const song = (item: SongItem) => (
    <button
      key={item.title + item.artist}
      type="button"
      className="itemrow"
      onClick={() =>
        setOpen({title: item.title, meta: [item.artist, item.year].filter(Boolean).join(' · '), body: item.story})
      }
    >
      <span>
        {item.title} {item.artist && <span className="dim">{item.artist}</span>}
      </span>
      {item.year && <span className="r">{item.year}</span>}
    </button>
  );
  const person = (item: PeopleItem) => {
    const show = () =>
      setOpen({
        title: item.name,
        meta: [item.role, item.years].filter(Boolean).join(' · '),
        body: item.oneLine,
        image: item.imageUrl,
      });
    if (item.imageUrl)
      return (
        <PhotoCard
          key={item.name}
          image={item.imageUrl}
          title={item.name}
          meta={item.role}
          desc={item.oneLine}
          ratio="1 / 1"
          onClick={show}
        />
      );
    return (
      <button key={item.name} type="button" className="itemcard" onClick={show}>
        <p className="cap">
          <b>{item.name}</b> {item.role && <span className="dim">{item.role}</span>}
        </p>
        {item.oneLine && <p className="cap dim clamp">{item.oneLine}</p>}
      </button>
    );
  };
  const event = (item: ChronicleItem) => (
    <button
      key={`${item.year}-${item.title}`}
      type="button"
      className="itemrow"
      onClick={() =>
        setOpen({
          title: item.title,
          meta: [item.year, item.place].filter(Boolean).join(' · '),
          body: item.summary,
          image: item.imageUrl,
        })
      }
    >
      <span>
        {item.title}
        {item.place && (
          <span className="dim" style={{display: 'block'}}>
            {item.place}
          </span>
        )}
      </span>
      {item.year && <span className="r">{item.year}</span>}
    </button>
  );
  const book = (item: ReadingItem) => (
    <button
      key={item.title}
      type="button"
      className="itemcard"
      onClick={() => setOpen({title: item.title, meta: item.year ? String(item.year) : item.group, body: item.body})}
      style={{padding: '16px 18px', background: 'var(--soft)', marginBottom: 10}}
    >
      <p style={{margin: '0 0 6px', fontSize: '15.5px'}}>
        <b className="mj">{item.title}</b> {item.year && <span className="dim">{item.year}</span>}
      </p>
      <p className="clamp" style={{margin: 0, fontSize: '16.5px', lineHeight: 1.85, color: '#4a453a'}}>
        {item.body}
      </p>
    </button>
  );

  return (
    <>
      <section className="sec" id="story" aria-labelledby="story-heading">
        <p className="eyebrow">STORY</p>
        <h2 id="story-heading" style={{marginBottom: 0}}>
          {sectionName(payload, 'story', `${region} 이야기`)} <span>{parts.join(' · ')}</span>
        </h2>
        <p className="note" style={{margin: '10px 0 0'}}>
          이 도시를 {COUNT_WORD[parts.length] ?? parts.length} 갈래로 봅니다. 하나씩 골라 보세요.
        </p>
      </section>

      {songs.items.length > 0 && (
        <section className="sec" style={{paddingTop: 18}} id="songs">
          <p className="eyebrow">MUSIC</p>
          <h2>
            {songs.title || '가요 다방'} <span>{songs.items.length}곡</span>
          </h2>
          <p className="note" style={{margin: '-8px 0 14px'}}>
            {region}을 노래한 곡들입니다.
          </p>
          {songs.items.slice(0, 6).map(song)}
          <More rest={songs.items.length - 6} unit="곡">
            {songs.items.slice(6).map(song)}
          </More>
        </section>
      )}

      {people.items.length > 0 && (
        <section className="sec" id="people">
          <p className="eyebrow">PEOPLE</p>
          <h2>
            {people.title || '인물 열전'} <span>{people.items.length}명</span>
          </h2>
          <p className="note" style={{margin: '-8px 0 14px'}}>
            {region}과 얽힌 사람들입니다.
          </p>
          <div className="grid2 grid3">{peopleSorted.slice(0, 4).map(person)}</div>
          <More rest={people.items.length - 4} unit="명">
            <div className="grid2 grid3" style={{marginTop: 4}}>
              {peopleSorted.slice(4).map(person)}
            </div>
          </More>
          {withPhoto > 0 && withPhoto < people.items.length && (
            <p className="note" style={{margin: '14px 0 0'}}>
              사진이 있는 {withPhoto}명을 먼저 뒀습니다.
            </p>
          )}
        </section>
      )}

      {chronicle.items.length > 0 && (
        <section className="sec" id="chronicle">
          <p className="eyebrow">CHRONICLE</p>
          <h2>{chronicle.title || '시간의 골목'}</h2>
          <p className="note" style={{margin: '-8px 0 14px'}}>
            개항부터 지금까지, 이 도시의 연표입니다.
          </p>
          {chronicle.items.map(event)}
        </section>
      )}

      {reading.items.length > 0 && (
        <section className="sec" id="reading">
          <p className="eyebrow">READING</p>
          <h2>
            {reading.title || `${region} 읽기`} <span>{reading.items.length}편</span>
          </h2>
          <p className="note" style={{margin: '-8px 0 14px'}}>
            {region}을 배경으로 한 문학입니다.
          </p>
          {reading.items.slice(0, 3).map(book)}
          <More rest={reading.items.length - 3} unit="편">
            {reading.items.slice(3).map(book)}
          </More>
        </section>
      )}

      <Sheet open={open != null} onClose={() => setOpen(null)} label={open?.title ?? ''}>
        {open && (
          <>
            {open.image && <img src={open.image} alt={open.title} style={{aspectRatio: '1 / 1', maxHeight: '60svh'}} />}
            <h3>{open.title}</h3>
            {open.meta && <p className="meta">{open.meta}</p>}
            {open.body && <p>{open.body}</p>}
          </>
        )}
      </Sheet>
    </>
  );
}