// The one JSON document every public page renders from. No phone numbers, no team codes.
export function publicState({ t, engine }) {
  const name = id => t.teamName(id);
  const view = m => ({
    id: m.id, stage: m.stage, round: m.round, slot: m.slot, label: m.label ?? null, status: m.status, court: m.court,
    a: m.teamA ? { id: m.teamA, name: name(m.teamA) } : null,
    b: m.teamB ? { id: m.teamB, name: name(m.teamB) } : null,
    winner: m.winner, sets: m.sets, live: m.live ?? null, liveSets: m.liveSets ?? null, startedAt: m.startedAt ?? null, feeds: m.feeds, feedsSide: m.feedsSide, loserFeeds: m.loserFeeds ?? null, loserFeedsSide: m.loserFeedsSide ?? null, conditional: !!m.conditional,
  });
  const board = t.phase === 'live' ? engine.board() : null;
  const pools = t.pools.map(p => ({
    id: p.id,
    standings: t.standings(p.id).map(r => ({ teamId: r.teamId, name: r.name, w: r.w, l: r.l, setsW: r.setsW, setsL: r.setsL, pf: r.pf, pa: r.pa, pointDiff: r.pointDiff, decidedBy: r.decidedBy, status: r.status })),
    matches: t.matches.filter(m => m.poolId === p.id).map(view),
  }));
  const bracket = t.matches.filter(m => m.stage !== 'pool').map(view);
  const teams = t.activeTeams().map(x => t.publicTeam(x.id));
  const withdrawn = [...t.teams.values()].filter(x => x.status === 'withdrawn').map(x => t.publicTeam(x.id));
  return {
    slug: t.slug, name: t.name, date: t.date, notes: t.notes ?? '', phase: t.phase, banner: t.banner ?? null,
    rules: t.rules, stages: t.stages, courtCount: t.courtCount,
    teams, withdrawn, pools, bracket,
    courts: board ? board.courts.map(c => ({ ...c, match: c.match ? view(t.match(c.match.id)) : null })) : [],
    upNext: board ? board.upNext.map(u => ({ ...view(t.match(u.id)), court: u.court, etaMin: u.etaMin })) : [],
    avgMatchMin: board?.avgMatchMin ?? null,
    champion: t.phase === 'final' ? t.champion() : null,
    recentAlerts: engine.alerts.slice(-20).map(a => ({ kind: a.kind, text: a.text, at: a.at, teams: a.teams ?? [], match: a.match ?? null })),
    generatedAt: Date.now(),
  };
}