// Small display helpers for the browse pages. Times here are DURATIONS and
// SIZES -- readings, not judgements -- so wherever they are shown in colour it
// is `--color-meter`, never a verdict hue.

/** `1:40`, `0:49`, `12:03`. Renders a cut length the way the READMEs quote it. */
export function fmtDur(seconds: number): string {
  if (!Number.isFinite(seconds) || seconds <= 0) return "–";
  const s = Math.round(seconds);
  return `${Math.floor(s / 60)}:${String(s % 60).padStart(2, "0")}`;
}

export function fmtBytes(n: number): string {
  if (!n) return "–";
  const mb = n / (1 << 20);
  return mb >= 1000 ? `${(mb / 1024).toFixed(1)} GB` : `${mb.toFixed(1)} MB`;
}

const MIN = 60_000;
const HOUR = 60 * MIN;
const DAY = 24 * HOUR;

/** How long ago, coarsely. "which of these did I just rebuild" is the question. */
export function fmtAgo(mtimeMs: number, now = Date.now()): string {
  if (!mtimeMs) return "–";
  const d = Math.max(0, now - mtimeMs);
  if (d < MIN) return "just now";
  if (d < HOUR) return `${Math.floor(d / MIN)}m ago`;
  if (d < DAY) return `${Math.floor(d / HOUR)}h ago`;
  return `${Math.floor(d / DAY)}d ago`;
}