/** 展示格式化工具：时间、字节、OCID 截断 */

export function fmtTime(iso: string | null | undefined): string {
  if (!iso) return '—'
  const d = new Date(iso)
  if (Number.isNaN(d.getTime())) return '—'
  const pad = (n: number) => String(n).padStart(2, '0')
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`
}

export function fmtRelative(iso: string | null | undefined): string {
  if (!iso) return '—'
  const diff = Date.now() - new Date(iso).getTime()
  if (Number.isNaN(diff)) return '—'
  const min = Math.floor(diff / 60000)
  if (min < 1) return '刚刚'
  if (min < 60) return `${min} 分钟前`
  const hr = Math.floor(min / 60)
  if (hr < 24) return `${hr} 小时前`
  return `${Math.floor(hr / 24)} 天前`
}

export function fmtBytes(n: number): string {
  if (n <= 0) return '0 B'
  const units = ['B', 'KB', 'MB', 'GB', 'TB']
  const i = Math.min(Math.floor(Math.log2(n) / 10), units.length - 1)
  return `${(n / 2 ** (10 * i)).toFixed(1)} ${units[i]}`
}

/** 金额展示:千分位 + 2 位小数,常见币种转符号前缀,其余保留币种码 */
export function fmtMoney(n: number, currency = 'USD'): string {
  const sym: Record<string, string> = { USD: '$', EUR: '€', GBP: '£', JPY: '¥', CNY: '¥' }
  const s = n.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
  const p = sym[currency]
  return p ? p + s : `${currency} ${s}`.trim()
}

/** OCID 中段省略：ocid1.instance.oc1..aaaa…mc25a */
export function truncOcid(ocid: string, head = 24, tail = 6): string {
  if (!ocid || ocid.length <= head + tail + 1) return ocid
  return `${ocid.slice(0, head)}…${ocid.slice(-tail)}`
}

/** 可用域展示：RssO:EU-FRANKFURT-1-AD-1 → AD-1 */
export function shortAd(ad: string): string {
  const m = ad.match(/AD-\d+$/)
  return m ? m[0] : ad
}

/** 区域友好名中括号内的城市短名：Germany Central (Frankfurt) → Frankfurt */
export function regionCity(label: string): string {
  const m = /\(([^)]+)\)/.exec(label)
  return m ? m[1] : label
}

/** 块存储 VPU/GB 档位：0 低成本 / 10 均衡 / 20 高性能 / 30-120 超高性能 */
export function vpusLabel(vpus: number): string {
  if (vpus >= 30) return `${vpus} · 超高性能`
  if (vpus >= 20) return `${vpus} · 高性能`
  if (vpus >= 10) return `${vpus} · 均衡`
  return `${vpus} · 低成本`
}

/** Oracle 官方风格默认资源名：instance-20260703-2136 / vcn-20260509-0252 */
export function defaultResourceName(prefix: string): string {
  const now = new Date()
  const pad = (n: number) => String(n).padStart(2, '0')
  const date = `${now.getFullYear()}${pad(now.getMonth() + 1)}${pad(now.getDate())}`
  return `${prefix}-${date}-${pad(now.getHours())}${pad(now.getMinutes())}`
}