/**
 * 格式化工具模块
 */

/**
 * 格式化时间戳
 * - "今天 HH:mm" if same day
 * - "昨天" if 1 day ago
 * - "前天" if 2 days ago
 * - "M月D号" if more than 2 days ago
 */
export function formatTimestamp(timestamp, now = new Date()) {
  if (!timestamp) return ''
  
  const date = new Date(timestamp)
  if (isNaN(date.getTime())) return ''
  
  const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate())
  const yesterdayStart = new Date(todayStart.getTime() - 24 * 60 * 60 * 1000)
  const dayBeforeYesterdayStart = new Date(todayStart.getTime() - 2 * 24 * 60 * 60 * 1000)
  
  const dateStart = new Date(date.getFullYear(), date.getMonth(), date.getDate())
  
  if (dateStart.getTime() === todayStart.getTime()) {
    const hours = String(date.getHours()).padStart(2, '0')
    const minutes = String(date.getMinutes()).padStart(2, '0')
    return `今天 ${hours}:${minutes}`
  } else if (dateStart.getTime() === yesterdayStart.getTime()) {
    return '昨天'
  } else if (dateStart.getTime() === dayBeforeYesterdayStart.getTime()) {
    return '前天'
  } else {
    const month = date.getMonth() + 1
    const day = date.getDate()
    return `${month}月${day}号`
  }
}

/**
 * 脱敏姓名
 */
export function maskName(name) {
  if (!name || name.length === 0) return ''
  if (name.length === 1) return name
  if (name.length === 2) return name[0] + '*'
  
  const first = name[0]
  const last = name[name.length - 1]
  const middle = '*'.repeat(name.length - 2)
  return first + middle + last
}

/**
 * 脱敏手机号
 */
export function maskPhone(phone) {
  if (!phone || phone.length < 7) return phone || ''
  return phone.substring(0, 3) + '****' + phone.substring(phone.length - 4)
}

export default {
  formatTimestamp,
  maskName,
  maskPhone
}