// Small pure render helpers shared across swarm-ui pages. Not folded
// into `@hive/shared` — swarm-ui's formatting choices aren't a
// cross-package contract, and there's nothing here worth sharing.

// Relative age, coarsened to one unit ("5m ago"). Built on the native
// `Intl.RelativeTimeFormat` (no dependency needed — mara asked whether
// a lightweight package was warranted; the runtime already ships this)
// with `style: 'narrow'`, which produces the same "5s/5m/5h/5d ago"
// shape the dashboard package's hand-rolled equivalent does, verified
// against a real `Intl` call rather than assumed from the spec.
const RTF = new Intl.RelativeTimeFormat("en", {
  numeric: "always",
  style: "narrow",
});

// The same coarsening for an instant still ahead ("in 5m"). A separate
// function rather than a negative `fmtAgo`: that one clamps to zero so a
// clock a little ahead of the server never reads as "-3s ago".
export function fmtUntil(secondsAhead: number): string {
  const ahead = Math.max(0, Math.floor(secondsAhead));
  if (ahead < 60) return RTF.format(ahead, "second");
  if (ahead < 3600) return RTF.format(Math.floor(ahead / 60), "minute");
  if (ahead < 86400) return RTF.format(Math.floor(ahead / 3600), "hour");
  return RTF.format(Math.floor(ahead / 86400), "day");
}

export function fmtAgo(ageSeconds: number): string {
  const age = Math.max(0, Math.floor(ageSeconds));
  if (age < 60) return RTF.format(-age, "second");
  if (age < 3600) return RTF.format(-Math.floor(age / 60), "minute");
  if (age < 86400) return RTF.format(-Math.floor(age / 3600), "hour");
  return RTF.format(-Math.floor(age / 86400), "day");
}