function isEmpty(val) {
  return typeof val === 'undefined' || val === '' || val === null
}

function formatTime(time) {
  if (isEmpty(time)) {
    return ''
  }
  var minute = 60 * 1000
  var just = 3 * 60 * 1000
  var onehour = 60 * 60 * 1000
  var oneday = 24 * 60 * 60 * 1000
  time = time.replace(getRegExp('/\s/g', 'g'), '')
  var datetime = getDate(time.trim())
  var gap = getDate().getTime() - datetime.getTime()
  
  if (gap > oneday) {
    return time.substring(0, 10)
  } else if (gap > onehour) {
    return parseInt(gap / onehour) + '小时前'
  } else if (gap > onehour) {
    return parseInt(gap / onehour) + '小时前'
  } else if (gap > just) {
    return parseInt(gap / minute) + '分钟前'
  } else {
    return '刚刚更新'
  }
}

function formateDate(datetime) {
  if (isEmpty(datetime)) {
    return ''
  }
  var date = getDate(datetime.trim())
  var today = getDate()
  var dayCode = 24 * 60 * 60 * 1000
  var week = ''
  if (date.getTime() === today.getTime()) {
    week = '(今天)'
  } else if (date.getTime() === today.getTime() + dayCode) {
    week = '(明天)'
  } else if (date.getTime() === today.getTime() - dayCode) {
    week = '(昨天)'
  } else if (date.getTime() === today.getTime() + dayCode * 2) {
    week = '(后天)'
  } else {
    week = ['(周日)', '(周一)', '(周二)', '(周三)', '(周四)', '(周五)', '(周六)'][date.getDay()]
  }
  if (isEmpty(week)) {
    week = ''
  }
  return datetime + week
}

function formateAmount(amount) {
  if (isEmpty(amount)) {
    return ''
  }
  return Number(amount).toFixed(2)
}

function formateWeight(weight) {
  return (parseFloat(weight) / 1000).toFixed(2)
}

module.exports = {
  formateAmount: formateAmount,
  formateWeight: formateWeight,
  formatTime: formatTime,
  formateDate: formateDate
}