/**
 * 초보자 도움 (docs/07 §5): "30초 규칙 요약" cards (first game of a kind on this device) and the
 * in-game [?] sheet ("지금 할 수 있는 것" + full rules + summary again). Content lives in each game's chunk.
 */
import { useCallback, useEffect, useState } from 'react';
import { createPortal } from 'react-dom';
import type { PublicUser, RoomView } from '@bg/shared/lite';
import { Sheet } from './ui';
import { useRoom } from '../net/socket';
import type { GameUI, QuickCard } from '../games/types';

const seenKey = (gameId: string) => `bg:qs:${gameId}`;

export function quickStartSeen(gameId: string): boolean {
  try {
    return localStorage.getItem(seenKey(gameId)) === '1';
  } catch {
    return true; // storage blocked: don't nag every game
  }
}

function markQuickStartSeen(gameId: string) {
  try {
    localStorage.setItem(seenKey(gameId), '1');
  } catch {
    /* ignore */
  }
}

/** The 3 summary cards with [다음] / [건너뛰기] / [시작하기]. */
export function QuickStartCards({ title, cards, onClose, finish = '시작하기' }: { title: string; cards: QuickCard[]; onClose: () => void; finish?: string }) {
  const [i, setI] = useState(0);
  const card = cards[i]!;
  const last = i === cards.length - 1;
  return (
    <Sheet onClose={onClose} label={`${title} 30초 규칙 요약`}>
      <p className="muted small" style={{ margin: 0, textAlign: 'center' }}>
        {title} 30초 규칙 요약 · {i + 1}/{cards.length}
      </p>
      <div
        role="img"
        aria-label={card.alt}
        style={{ minHeight: 170, display: 'flex', alignItems: 'center', justifyContent: 'center', gap: 8, flexWrap: 'wrap', padding: 12, borderRadius: 16, background: 'var(--bg)' }}
      >
        {card.pic}
      </div>
      <h2 style={{ margin: 0, textAlign: 'center' }} aria-live="polite">
        {card.title}
      </h2>
      <p style={{ margin: 0, fontSize: '1.15rem', lineHeight: 1.6, textAlign: 'center' }}>{card.text}</p>
      <div className="row" style={{ justifyContent: 'center', gap: 6 }} aria-hidden>
        {cards.map((_, k) => (
          <span key={k} className="dot" style={{ width: 10, height: 10, background: k === i ? 'var(--primary)' : 'var(--border)' }} />
        ))}
      </div>
      {last ? (
        <button className="btn btn-primary btn-block" style={{ minHeight: 60 }} onClick={onClose} autoFocus>
          {finish}
        </button>
      ) : (
        <div className="row" style={{ flexWrap: 'nowrap' }}>
          <button className="btn btn-secondary" style={{ flex: 1 }} onClick={onClose}>
            건너뛰기
          </button>
          <button className="btn btn-primary" style={{ flex: 2, minHeight: 60 }} onClick={() => setI(i + 1)}>
            다음 →
          </button>
        </div>
      )}
    </Sheet>
  );
}

/** "30초 요약 보기" button for places outside a game (rules page). */
export function QuickStartButton({ title, cards }: { title: string; cards: QuickCard[] | undefined }) {
  const [open, setOpen] = useState(false);
  const close = useCallback(() => setOpen(false), []);
  if (!cards?.length) return null;
  return (
    <>
      <button className="btn btn-secondary btn-block" onClick={() => setOpen(true)}>
        🃏 30초 요약 보기
      </button>
      {open && <QuickStartCards title={title} cards={cards} finish="닫기" onClose={close} />}
    </>
  );
}

/**
 * [?] button next to the turn status while a game is on screen. Also opens the summary cards by itself
 * the first time this device sees a running game of this kind.
 */
export function GameHelp({ room, ui, title, me, players }: { room: RoomView; ui: GameUI; title: string; me: string; players: Record<string, PublicUser> }) {
  const view = useRoom((s) => s.game?.view);
  const [open, setOpen] = useState(false);
  const [rules, setRules] = useState(false);
  const [cards, setCards] = useState(false);
  const playing = room.status === 'playing';
  const gameId = room.gameId;

  useEffect(() => {
    if (playing && ui.quickStart?.length && !quickStartSeen(gameId)) setCards(true);
  }, [playing, gameId, ui]);

  // Stable callbacks: Sheet re-runs its focus effect when onClose changes (every game update otherwise).
  const closeCards = useCallback(() => {
    markQuickStartSeen(gameId);
    setCards(false);
  }, [gameId]);
  const closeHelp = useCallback(() => setOpen(false), []);
  const seated = room.seats.some((s) => s?.user.id === me);
  const now =
    room.status === 'paused'
      ? '오류로 게임이 멈췄어요. 방장이 [게임 끝내기] 버튼으로 끝낼 수 있어요.'
      : view === undefined
        ? ''
        : (ui.helpNow ?? ui.statusText)(view, me, players);

  return (
    <>
      <button className="btn btn-secondary" style={{ flexShrink: 0, padding: '0 12px', flexDirection: 'column', gap: 0, lineHeight: 1.1 }} onClick={() => (setRules(false), setOpen(true))} aria-label="도움말: 지금 할 수 있는 것" aria-haspopup="dialog">
        <span aria-hidden style={{ fontSize: '1.3rem' }}>?</span>
        <span className="small">도움</span>
      </button>
      {open &&
        createPortal(
          <Sheet onClose={closeHelp} label="지금 할 수 있는 것">
            <h2 style={{ margin: 0 }}>지금 할 수 있는 것</h2>
            {!seated && <p className="muted" style={{ margin: 0 }}>지금은 구경하고 있어요. 게임에는 손댈 수 없어요.</p>}
            <p className="help-now" style={{ margin: 0, fontSize: '1.2rem', lineHeight: 1.6, whiteSpace: 'pre-line', fontWeight: 600 }}>
              {now}
            </p>
            <div className="stack" style={{ gap: 8 }}>
              <button className="btn btn-secondary btn-block" aria-expanded={rules} onClick={() => setRules(!rules)}>
                📖 {rules ? '규칙 접기' : '전체 규칙 보기'}
              </button>
              {rules && (
                <section className="card stack" aria-label={`${title} 규칙`}>
                  <ui.Rules options={room.options} />
                </section>
              )}
              {!!ui.quickStart?.length && (
                <button className="btn btn-secondary btn-block" onClick={() => (setOpen(false), setCards(true))}>
                  🃏 30초 요약 다시 보기
                </button>
              )}
              <button className="btn btn-primary btn-block" onClick={() => setOpen(false)}>
                닫기
              </button>
            </div>
          </Sheet>,
          document.body,
        )}
      {cards && ui.quickStart && createPortal(<QuickStartCards title={title} cards={ui.quickStart} onClose={closeCards} />, document.body)}
    </>
  );
}