export const FILE_PICKER_ICONS = {
  folder: 'M4 7h6l2 2h8v10H4z',
  file: 'M14 3v5h5M14 3H7a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V8z',
  lock: 'M7 11V8a5 5 0 0 1 10 0v3M5 11h14v10H5z',
}

export function formatBytes(bytes: number | null): string {
  if (bytes === null) return '—'
  const units = ['B', 'KB', 'MB', 'GB', 'TB']
  let value = bytes
  let unit = 0
  while (value >= 1024 && unit < units.length - 1) {
    value /= 1024
    unit += 1
  }
  const rounded = value >= 100 || unit === 0 ? Math.round(value) : Number(value.toFixed(1))
  return `${rounded} ${units[unit]}`
}

const pad = (value: number) => String(value).padStart(2, '0')

/** Compact local timestamp for a fixed-width mono column: `MM-DD HH:mm`, or `YYYY-MM-DD` outside this year. */
export function formatModified(value: string | null | undefined, now = new Date()): string {
  const date = value ? new Date(value) : null
  if (!date || Number.isNaN(date.getTime())) return ''
  const day = `${pad(date.getMonth() + 1)}-${pad(date.getDate())}`
  return date.getFullYear() === now.getFullYear()
    ? `${day} ${pad(date.getHours())}:${pad(date.getMinutes())}`
    : `${date.getFullYear()}-${day}`
}