// 星期格式转换 0-6：周日到周六
function weekFormat(e, prefix = "周") {
  switch (e) {
      case 0:
          return prefix + "日"
          break;
      case 1:
          return prefix + "一"
          break;
      case 2:
          return prefix + "二"
          break;
      case 3:
          return prefix + "三"
          break;
      case 4:
          return prefix + "四"
          break;
      case 5:
          return prefix + "五"
          break;
      case 6:
          return prefix + "六"
          break;
      default:
          return ""
          break;
  }
}
// 转换今日的时辰格式
function todayTimeFormat(e) {
  if (e >= 0 && e < 7) {
      return "凌晨"
  } else if (e >= 7 && e < 11) {
      return "上午"
  } else if (e >= 11 && e < 13) {
      return "中午"
  } else if (e >= 13 && e < 18) {
      return "下午"
  } else if (e >= 18 && e < 24) {
      return "晚上"
  } else {
      return ""
  }
}

// 是否显示周几
function isShowWeekDay(sub, weekDay) {
  const currentWeekDay = new Date().getDay()
  const dayTime = 1000 * 60 * 60 * 24
  // 1.当前时间与消息时间相差必须大于2天小于7天
  // 2.当前时间距离本周一相差必须大于2天且小于当前距离周一的天数
  // 3.消息时间不可能是0-周日，因为周日没有给后面时间留空间，不会走这里的逻辑，而是走今天的逻辑
  if (sub >= dayTime * 2 && weekDay !== 0 && sub <= dayTime * currentWeekDay) {
      return true
  } else {
      return false
  }
}


// 仿微信时间显示格式转换 @time 时间戳毫秒
function wechatTimeFormat(time) {
  const today = new Date().getTime()
  // 当前时间减去获取到的时间
  const sub = today - time
  const day = 1000 * 60 * 60 * 24
  const timeDate = new Date(time)
  const currentYear = new Date().getFullYear()
  const getYear = new Date(time).getFullYear()
  const HHmm = `${formatTime2("hh", timeDate)}:${formatTime2("mm", timeDate)}`
  const showWeekDay = isShowWeekDay(sub, timeDate.getDay())
  const currentDay = new Date().getDate()
  const getDay = new Date(time).getDate()
  const subDay = currentDay - getDay
  if (currentYear > getYear) {
      return `${formatTime2("yyyy-MM-dd", timeDate)} ${formatTime2("hh:mm", timeDate)}`
      // 上午下午
      return `${formatTime2("yyyy年MM月dd日", timeDate)} ${todayTimeFormat(timeDate.getHours())} ${formatTime2("hh:mm", timeDate)}`
  } else if (showWeekDay) {
      return `${weekFormat(timeDate.getDay())} ${HHmm}`
      //} else if (sub > day && sub < day * 2) {
  } else if (subDay === 1) {
      return `昨天 ${HHmm}`
  } else if (sub <= day) {
      return HHmm
  } else {
      return `${formatTime2("MM-dd", timeDate)} ${formatTime2("hh:mm", timeDate)}`
      // 上午下午
      return `${formatTime2("MM月dd日", timeDate)} ${todayTimeFormat(timeDate.getHours())} ${formatTime2("hh:mm", timeDate)}`
  }
}

function formatTime2(fmt, timestamp) {
  var date = new Date(timestamp) // 兼容safari
  var o = {
      'M+': date.getMonth() + 1,
      'd+': date.getDate(),
      'h+': date.getHours(),
      'm+': date.getMinutes(),
      's+': date.getSeconds(),
      'q+': Math.floor((date.getMonth() + 3) / 3),
      'S': date.getMilliseconds()
  }
  if (/(y+)/.test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  for (var k in o) {
      if (new RegExp('(' + k + ')').test(fmt)) {
          fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (('00' + o[k]).substr(('' + o[k]).length)))
      }
  }
  return fmt
}

module.exports = {
  weekFormat,
  todayTimeFormat,
  isShowWeekDay,
  wechatTimeFormat
}