export function fmtUsd(value: number, compact = true): string {
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD",
    notation: compact && Math.abs(value) >= 10_000 ? "compact" : "standard",
    maximumFractionDigits: Math.abs(value) >= 10_000 ? 1 : 2,
  }).format(value);
}

export function fmtPct(value: number, digits = 2): string {
  return `${(value * 100).toFixed(digits)}%`;
}

export function fmtAprPct(value: number): string {
  const pct = value * 100;
  if (pct > 9_999) return ">9,999%";
  if (pct >= 1_000) return `${Math.round(pct).toLocaleString("en-US")}%`;
  return `${pct.toFixed(1)}%`;
}

export function fmtNum(value: number): string {
  return new Intl.NumberFormat("en-US", {
    notation: Math.abs(value) >= 10_000 ? "compact" : "standard",
    maximumFractionDigits: 1,
  }).format(value);
}

export function fmtCountdown(untilSec: number): string {
  const s = Math.max(untilSec - Math.floor(Date.now() / 1000), 0);
  const d = Math.floor(s / 86_400);
  const h = Math.floor((s % 86_400) / 3_600);
  const m = Math.floor((s % 3_600) / 60);
  if (d > 0) return `${d}d ${h}h`;
  if (h > 0) return `${h}h ${m}m`;
  return `${m}m`;
}