export function formatNumber(n: number): string {
  if (n < 0) return `-${formatNumber(-n)}`;
  if (n < 1_000) return Math.floor(n).toString();
  if (n < 1_000_000) return `${(n / 1_000).toFixed(1)}K`;
  if (n < 1_000_000_000) return `${(n / 1_000_000).toFixed(1)}M`;
  if (n < 1_000_000_000_000) return `${(n / 1_000_000_000).toFixed(1)}B`;
  return `${(n / 1_000_000_000_000).toFixed(1)}T`;
}

export function formatMoney(n: number): string {
  if (n < 0) return `-$${formatNumber(-n)}`;
  return `$${formatNumber(n)}`;
}

export function formatPercent(n: number, decimals = 1): string {
  return `${(n * 100).toFixed(decimals)}%`;
}

export function formatTokens(n: number): string {
  return `${formatNumber(n)} tok`;
}

export function formatFlops(n: number): string {
  return `${formatNumber(n)} FLOPS`;
}

export function uuid(): string {
  if (typeof crypto !== 'undefined' && crypto.randomUUID) {
    return crypto.randomUUID();
  }
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
    const r = (Math.random() * 16) | 0;
    return (c === 'x' ? r : (r & 0x3) | 0x8).toString(16);
  });
}

export function formatDuration(ticks: number): string {
  if (ticks < 60) return `${ticks}s`;
  if (ticks < 3600) return `${Math.floor(ticks / 60)}m ${ticks % 60}s`;
  const hours = Math.floor(ticks / 3600);
  const minutes = Math.floor((ticks % 3600) / 60);
  return `${hours}h ${minutes}m`;
}