export function formatDate(date: string | Date, fmt = 'YYYY-MM-DD'): string {
  const d = typeof date === 'string' ? new Date(date) : date
  const map: Record<string, string> = {
    'YYYY': String(d.getFullYear()),
    'MM': String(d.getMonth() + 1).padStart(2, '0'),
    'DD': String(d.getDate()).padStart(2, '0'),
    'HH': String(d.getHours()).padStart(2, '0'),
    'mm': String(d.getMinutes()).padStart(2, '0'),
  }
  let result = fmt
  for (const [k, v] of Object.entries(map)) {
    result = result.replace(k, v)
  }
  return result
}

export function getRelativeTime(date: string): string {
  const now = Date.now()
  const target = new Date(date).getTime()
  const diff = now - target
  const minutes = Math.floor(diff / 60000)
  if (minutes < 1) return '刚刚'
  if (minutes < 60) return `${minutes}分钟前`
  const hours = Math.floor(minutes / 60)
  if (hours < 24) return `${hours}小时前`
  const days = Math.floor(hours / 24)
  if (days < 30) return `${days}天前`
  return formatDate(date)
}