export function formatDateTime(value?: string | null): string {
  if (!value) {
    return '-'
  }
  const date = new Date(value)
  if (Number.isNaN(date.getTime())) {
    return value
  }
  return date.toLocaleString('zh-CN', {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
  })
}

export function formatBytes(value: number): string {
  if (!Number.isFinite(value) || value <= 0) {
    return '0 B'
  }
  const units = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']
  let size = value
  let unit = 0
  while (size >= 1024 && unit < units.length - 1) {
    size /= 1024
    unit += 1
  }
  return `${size.toFixed(unit === 0 ? 0 : 2)} ${units[unit]}`
}

export function formatUptime(seconds: number): string {
  const days = Math.floor(seconds / 86400)
  const hours = Math.floor((seconds % 86400) / 3600)
  const minutes = Math.floor((seconds % 3600) / 60)
  if (days > 0) {
    return `${days}d ${hours}h ${minutes}m`
  }
  if (hours > 0) {
    return `${hours}h ${minutes}m`
  }
  return `${minutes}m`
}

export function shortId(id: string): string {
  return id.length > 10 ? `${id.slice(0, 8)}…` : id
}

export function prettyJson(value: unknown): string {
  try {
    return JSON.stringify(value, null, 2)
  } catch {
    return String(value)
  }
}