const ISO_DATE_TIME_PATTERN =
  /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})?$/

export function isIsoDateTimeString(value: unknown): value is string {
  return typeof value === 'string' && ISO_DATE_TIME_PATTERN.test(value.trim())
}

export function formatDateTime(value: string | null | undefined, fallback = '-') {
  const normalized = String(value || '').trim()

  if (!normalized) {
    return fallback
  }

  const date = new Date(normalized)

  if (Number.isNaN(date.getTime())) {
    return normalized.replace('T', ' ').replace('Z', '')
  }

  const year = date.getFullYear()
  const month = String(date.getMonth() + 1).padStart(2, '0')
  const day = String(date.getDate()).padStart(2, '0')
  const hours = String(date.getHours()).padStart(2, '0')
  const minutes = String(date.getMinutes()).padStart(2, '0')
  const seconds = String(date.getSeconds()).padStart(2, '0')

  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`
}

export function normalizeDateTimeValue(value: unknown): unknown {
  if (Array.isArray(value)) {
    return value.map((item) => normalizeDateTimeValue(item))
  }

  if (value && typeof value === 'object') {
    return Object.fromEntries(
      Object.entries(value).map(([key, currentValue]) => [
        key,
        normalizeDateTimeValue(currentValue),
      ]),
    )
  }

  if (isIsoDateTimeString(value)) {
    return formatDateTime(value, '')
  }

  return value
}

export function stringifyDisplayJson(value: unknown, space = 2) {
  return JSON.stringify(normalizeDateTimeValue(value), null, space)
}

/** 抢单大厅发布耗时格式化（仅内部打手可见）：发布 <1m / 发布 5m / 发布 1h 20m / 发布 1d 4h */
export function formatPublishedElapsedTime(
  value: string | null | undefined,
  nowMs = Date.now(),
): string {
  const normalized = String(value || '').trim()
  if (!normalized) return ''

  const date = new Date(normalized)
  const time = date.getTime()
  if (Number.isNaN(time)) return ''

  const diffSeconds = Math.max(0, Math.floor((nowMs - time) / 1000))

  if (diffSeconds < 60) {
    return '发布 <1m'
  }
  const diffMinutes = Math.floor(diffSeconds / 60)
  if (diffMinutes < 60) {
    return `发布 ${diffMinutes}m`
  }
  const diffHours = Math.floor(diffMinutes / 60)
  const remMinutes = diffMinutes % 60
  if (diffHours < 24) {
    return remMinutes > 0 ? `发布 ${diffHours}h ${remMinutes}m` : `发布 ${diffHours}h`
  }
  const diffDays = Math.floor(diffHours / 24)
  const remHours = diffHours % 24
  return remHours > 0 ? `发布 ${diffDays}d ${remHours}h` : `发布 ${diffDays}d`
}