/**
 * Top-of-dashboard status. With one strategy it is that strategy's status;
 * with several, the per-strategy numbers are aggregated for the whole account.
 */
export function aggregateStatus(status, multiStatus) {
  const list = multiStatus?.strategies || []
  if (list.length <= 1) return status

  const sum = (field) => list.reduce((acc, s) => acc + (s[field] || 0), 0)
  const halted = list.filter((s) => s.halted)

  return {
    ...status,
    running: multiStatus.running,
    price: multiStatus.price ?? status.price,
    cash: sum('cash'),
    equity: multiStatus.equity,
    starting_balance: multiStatus.starting_balance,
    realized_pnl: sum('realized_pnl'),
    unrealized_pnl: sum('unrealized_pnl'),
    total_pnl: multiStatus.total_pnl,
    day_pnl: sum('day_pnl'),
    // Worst individual strategy drawdown; the portfolio peak is not tracked.
    drawdown_pct: Math.max(0, ...list.map((s) => s.drawdown_pct || 0)),
    trades_today: sum('trades_today'),
    open_positions: sum('open_positions'),
    halted: halted.length > 0,
    halt_reason:
      halted
        .map((s) => s.halt_reason)
        .filter(Boolean)
        .join('; ') || null,
  }
}