import dayjs from 'dayjs'

export function formatPostTime(input?: dayjs.ConfigType): string {
  if (!input)
    return ''

  const time = dayjs(input)
  if (!time.isValid())
    return ''

  const now = dayjs()

  const diffSeconds = now.diff(time, 'second')
  if (diffSeconds < 0) {
    // 未来时间兜底
    return time.format('YYYY年MM月DD日')
  }

  // 1 分钟内
  if (diffSeconds < 60) {
    return '刚刚'
  }

  const diffMinutes = now.diff(time, 'minute')
  if (diffMinutes < 60) {
    return `${diffMinutes}分钟前`
  }

  const diffHours = now.diff(time, 'hour')
  if (diffHours < 24) {
    return `${diffHours}小时前`
  }

  const diffDays = now.diff(time, 'day')
  if (diffDays < 14) {
    return `${diffDays}天前`
  }

  // 本年
  if (time.year() === now.year()) {
    return time.format('MM月DD日')
  }

  // 非本年
  return time.format('YYYY年MM月DD日')
}

export function formatCommentTime(input?: dayjs.ConfigType): string {
  if (!input)
    return ''

  const time = dayjs(input)
  if (!time.isValid())
    return ''

  const now = dayjs()
  const diffSeconds = now.diff(time, 'second')

  // 未来时间兜底
  if (diffSeconds < 0) {
    return time.format('YYYY-MM-DD HH:mm')
  }

  // 1 分钟内
  if (diffSeconds < 60) {
    return '刚刚'
  }

  const diffMinutes = now.diff(time, 'minute')
  if (diffMinutes < 60) {
    return `${diffMinutes}分钟前`
  }

  const diffHours = now.diff(time, 'hour')
  if (diffHours < 24) {
    return `${diffHours}小时前`
  }

  const diffDays = now.diff(time, 'day')
  if (diffDays < 7) {
    return `${diffDays}天前`
  }

  // 本年
  if (time.year() === now.year()) {
    return time.format('MM-DD HH:mm')
  }

  // 非本年
  return time.format('YYYY-MM-DD HH:mm')
}

type DateFormat
  = | 'YYYY'
    | 'MM'
    | 'DD'
    | 'YYYY-MM'
    | 'YYYY-MM-DD'
    | 'YYYY-MM-DD HH:mm'
    | 'YYYY-MM-DD HH:mm:ss'
    | 'YYYY年MM月DD日'

export function formatDate(
  input?: dayjs.ConfigType,
  format: DateFormat = 'YYYY-MM-DD',
): string {
  if (!input)
    return ''

  const date = dayjs(input)
  if (!date.isValid())
    return ''

  return date.format(format)
}