const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : '0' + n
}

// 计算时间差
const handleDate = date => {
  if (typeof date === 'string') {
    date = new Date(date)
  }
  const diffValue = new Date().getTime() - date.getTime()
  if (diffValue < 0) {
    console.log('时间不同步')
    return '刚刚'
  }
  const minute = 1000 * 60
  const hour = minute * 60
  const day = hour * 24
  const minC = diffValue / minute
  const hourC = diffValue / hour
  const dayC = diffValue / day
  let result = ''
  if (parseInt(dayC) > 3) {
    result = date.getFullYear() + '/' + (date.getMonth() + 1) + '/' + date.getDate()
  } else if (parseInt(dayC) > 1) {
    result = parseInt(dayC) + '天前'
  } else if (parseInt(dayC) == 1) {
    result = '昨天'
  } else if (hourC >= 1) {
    result = parseInt(hourC) + '小时前'
  } else if (minC >= 3) {
    result = parseInt(minC) + '分钟前'
  } else {
    result = '刚刚'
  }
  return result
}

const randomString = len => {
  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
  let str = '';
  for (let i = 0; i < len; i++) {
    str += chars[Math.floor(Math.random() * chars.length)]
  }
  return str
}

const msgToDb = function (item) {
  item.type = item.type.join()
  item.poster = item.poster.join()
  item.photo = item.photo.join()
  if (item.tag) {
    item.tag = item.tag.join()
  }
  return item
}

const dbToMsg = function (item) {
  item.type = item.type.split(',')
  if (item.poster !== '') {
    item.poster = item.poster.split(',')
  } else {
    item.poster = []
  }
  if (item.photo !== '') {
    item.photo = item.photo.split(',')
  } else {
    item.poster = []
  }
  if (item.tag !== '') {
    item.tag = item.tag.split(',')
  } else {
    item.tag = []
  }
  item.publish_time = handleDate(item.publish_time)
  return item
}

module.exports = {
  formatTime: formatTime,
  handleDate: handleDate,
  randomString: randomString,
  msgToDb: msgToDb,
  dbToMsg: dbToMsg
}