export const isMicroMessenger = function () {
  return navigator.userAgent.indexOf('MicroMessenger') > -1
}

export const mul = function (a, b) {
  let c = 0
  let d = a.toString()
  let e = b.toString()
  try {
    c += d.split('.')[1].length
  } catch (f) {
    // console.log(f)
  }
  try {
    c += e.split('.')[1].length
  } catch (f) {
    // console.log(f)
  }
  return Number(d.replace('.', '')) * Number(e.replace('.', '')) / Math.pow(10, c)
}

export const formatRelative = function (value, ms = false) {
  let now = ms ? +new Date() : +new Date() / 1000
  let day, hour, minute, second, result
  let _value = value - now
  if (_value <= 0) {
    return '0天'
  }
  day = parseInt(_value / 86400)
  hour = parseInt(_value % 86400 / 3600)
  minute = parseInt(_value % 3600 / 60)
  second = parseInt(_value % 3600 % 60)
  result = day > 0 ? `${day}天` : hour > 0 ? `${hour}小时` : minute > 0 ? `${minute}分` : `${second}秒`
  return result
}

export default {
  isMicroMessenger,
  mul,
  formatRelative
}