export function formatTime(value: string): string {
  return !value || value.startsWith('0001-') ? '—' : new Date(value).toLocaleString('zh-CN')
}

function localInput(d: Date): string {
  return new Date(d.getTime() - d.getTimezoneOffset() * 60000).toISOString().slice(0, 16)
}

export function localToUTC(value: string): string {
  const d = new Date(value)
  if (!/^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}$/.test(value) || !Number.isFinite(d.getTime()) || localInput(d) !== value) throw new Error('无效的本地时间。')
  return d.toISOString()
}

export function quickRange(days: number, now = Date.now()) {
  const to = new Date(now), from = new Date(now)
  from.setHours(0, 0, 0, 0)
  from.setDate(from.getDate() - days + 1)
  return { from: from.toISOString(), to: to.toISOString(), fromInput: localInput(from), toInput: localInput(to) }
}

export function filterParams(filter: { key_id: string; from: string; to: string }) {
  const from = filter.from ? localToUTC(filter.from) : ''
  const to = filter.to ? localToUTC(filter.to) : ''
  if (from && to && from > to) throw new Error('开始时间不能晚于结束时间。')
  const params = new URLSearchParams()
  if (filter.key_id) params.set('key_id', filter.key_id)
  if (from) params.set('from', from)
  if (to) params.set('to', to)
  return params
}

export function keyExpiry(value: string, now = Date.now()) {
  if (!value) return ''
  const expires = localToUTC(value)
  if (new Date(expires).getTime() <= now) throw new Error('有效期必须晚于当前时间。')
  return expires
}