format.ts

/** Format a byte count → "1.2 GB", "512 MB", "128 KB" */
export function formatBytes(bytes: number): string {
  if (bytes >= 1e9) return `${(bytes / 1e9).toFixed(1)} GB`
  if (bytes >= 1e6) return `${Math.round(bytes / 1e6)} MB`
  return `${Math.round(bytes / 1e3)} KB`
}

/** Format a polygon/vertex count → "1.5M", "10.5k", "500" */
export function formatPoly(count: number): string {
  if (count >= 1_000_000) return `${(count / 1_000_000).toFixed(1)}M`
  if (count >= 1_000) return `${(count / 1_000).toFixed(1)}k`
  return String(count)
}

/** Format a timestamp → "14:32" */
export function formatTime(ts: number): string {
  return new Date(ts).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
}

/** Format a timestamp → "Today", "Yesterday", "Mar 8", "Mar 8, 2025" */
export function formatDate(ts: number): string {
  const d = new Date(ts)
  const today = new Date()
  const yesterday = new Date(today)
  yesterday.setDate(today.getDate() - 1)
  if (d.toDateString() === today.toDateString()) return 'Today'
  if (d.toDateString() === yesterday.toDateString()) return 'Yesterday'
  const opts: Intl.DateTimeFormatOptions = { month: 'short', day: 'numeric' }
  if (d.getFullYear() !== today.getFullYear()) opts.year = 'numeric'
  return d.toLocaleDateString([], opts)
}