/** 홈 (PC 기준, docs/07-ui-ux.md §3.3): 큰 행동 줄 + 게임 격자 + 열린 공개 방. */
import { useEffect, useState } from 'react';
import { Link, useNavigate } from 'react-router';
import { CATALOG, formatRoomCode } from '@bg/shared/lite';
import { Sheet } from '../components/ui';
import { NicknameForm } from '../components/NicknameForm';
import { CodeInput } from '../components/CodeInput';
import { GameGrid } from '../components/GameGrid';
import { gameName } from '../components/GameNotice';
import { api } from '../net/api';
import { useSession } from '../store/session';
import { toast } from '../store/toast';
import { GAME_ICON, UPCOMING } from '../lib/catalog-ui';

export function Home() {
  const { me, activeRoom } = useSession();
  const catalog = useSession((s) => (s.catalog.length ? s.catalog : CATALOG));
  const nav = useNavigate();
  const [picker, setPicker] = useState(false);
  const [needName, setNeedName] = useState<null | (() => void)>(null);
  const [busy, setBusy] = useState(false);
  const [rooms, setRooms] = useState<{ code: string; gameId: string; host: string; seated: number; max: number }[]>([]);
  const [codeKey, setCodeKey] = useState(0);
  const available = catalog.filter((g) => g.available);

  useEffect(() => {
    const load = () => api.allPublicRooms().then((r) => setRooms(r.rooms), () => {});
    load();
    const t = setInterval(load, 5000);
    return () => clearInterval(t);
  }, []);

  const withName = (fn: () => void) => (me ? fn() : setNeedName(() => fn));
  const create = (gameId: string) =>
    withName(async () => {
      setBusy(true);
      try {
        const { code } = await api.createRoom(gameId);
        nav(`/r/${code}`);
      } catch (e) {
        toast((e as Error).message, 'error');
      } finally {
        setBusy(false);
      }
    });
  const joinCode = async (code: string) => {
    try {
      await api.room(code);
      nav(`/r/${code}`);
    } catch (e) {
      toast((e as Error).message, 'error');
      setCodeKey((k) => k + 1);
    }
  };

  return (
    <main className="page" style={{ gap: 28 }}>
      <h1 className="sr-only">{useSession.getState().siteName}</h1>
      {activeRoom && (
        <Link to={`/r/${activeRoom}`} className="btn btn-success btn-block" style={{ minHeight: 60, fontSize: '1.15rem' }}>
          ▶ 하던 게임으로 돌아가기 (방 {formatRoomCode(activeRoom)})
        </Link>
      )}

      <section style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(320px, 1fr))', gap: 20 }}>
        <div className="card stack" style={{ padding: 24, justifyContent: 'center' }}>
          <h2>친구랑 같이 하기</h2>
          <p className="muted">방을 만들면 코드와 링크가 바로 나와요. 친구에게 보내 주세요.</p>
          <button
            className="btn btn-primary btn-block"
            style={{ minHeight: 72, fontSize: '1.3rem' }}
            disabled={busy}
            onClick={() => (available.length === 1 ? create(available[0]!.id) : setPicker(true))}
          >
            ＋ 방 만들기
          </button>
        </div>
        <div className="card stack" style={{ padding: 24 }}>
          <h2>코드로 참여하기</h2>
          <p className="muted">받은 숫자 6자리를 넣으면 바로 들어가요.</p>
          <CodeInput key={codeKey} onComplete={joinCode} autoFocus={false} />
        </div>
      </section>

      <div className="two-col" style={{ gridTemplateColumns: undefined }}>
        <section className="stack" style={{ gap: 16 }}>
          <h2>게임 고르기</h2>
          <GameGrid games={available} />
          <p className="muted small">곧 나와요: {UPCOMING.join(' · ')}</p>
        </section>
        <aside className="stack" style={{ gap: 12 }}>
          <h2>지금 열린 방</h2>
          {rooms.length === 0 && <p className="muted card">지금 기다리는 공개 방이 없어요. 게임을 골라 [빠른 시작]을 누르면 새 방이 열려요.</p>}
          {rooms.map((r) => (
            <div key={r.code} className="card row" style={{ justifyContent: 'space-between', flexWrap: 'nowrap' }}>
              <span style={{ fontSize: '1.8rem' }} aria-hidden>
                {GAME_ICON[r.gameId] ?? '🎲'}
              </span>
              <div style={{ flex: 1, minWidth: 0 }}>
                <strong>{gameName(r.gameId)}</strong> <span className="muted small">· {r.host}님의 방</span>
                <div className="muted small">
                  {r.seated}/{r.max}명 · {formatRoomCode(r.code)}
                </div>
              </div>
              <button className="btn btn-primary btn-sm" onClick={() => withName(() => nav(`/r/${r.code}`))}>
                참여
              </button>
            </div>
          ))}
        </aside>
      </div>

      {picker && (
        <Sheet onClose={() => setPicker(false)} label="게임 고르기">
          <h2>어떤 게임을 할까요?</h2>
          {available.map((g) => (
            <button key={g.id} className="btn btn-secondary btn-block" onClick={() => (setPicker(false), create(g.id))}>
              {GAME_ICON[g.id]} {g.nameKo}
            </button>
          ))}
        </Sheet>
      )}
      {needName && (
        <Sheet onClose={() => setNeedName(null)} label="이름 정하기">
          <h2>먼저 이름을 정해 주세요</h2>
          <NicknameForm
            next="/"
            onDone={() => {
              const fn = needName;
              setNeedName(null);
              fn();
            }}
          />
        </Sheet>
      )}
    </main>
  );
}