/**
 * 格式化日期
 * @param time 日期
 * @param format 格式默认 yyyy-MM-dd HH:mm:ss
 */
export function dateFormat(time, format) {
  if (!time) {
    return ''
  }
  if (!format) {
    format = 'yyyy-MM-dd HH:mm:ss'
  }
  if (typeof time === 'string') {
    time = time.replace(/-/g, '/')
  }
  if (/^\d+$/.test(time)) {
    time = Number(time)
  }
  const date = new Date(time)
  var tf = function(i) {
    return (i < 10 ? '0' : '') + i
  }
  return format.replace(/yyyy|MM|dd|HH|mm|ss/g, function(a) {
    switch (a) {
      case 'yyyy':
        return tf(date.getFullYear())
      case 'MM':
        return tf(date.getMonth() + 1)
      case 'mm':
        return tf(date.getMinutes())
      case 'dd':
        return tf(date.getDate())
      case 'HH':
        return tf(date.getHours())
      case 'ss':
        return tf(date.getSeconds())
    }
  })
}

export function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }

  if ((time + '').length === 10) {
    time = +time * 1000
  }

  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    date = new Date(parseInt(time))
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return time_str
}

export function formatTime(time, option) {
  if (typeof time === 'string') {
    time = time.replace(/-/g, '/')
  }

  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) { // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return d.getMonth() + 1 + '月' + d.getDate() + '日' + d.getHours() + '时' + d.getMinutes() + '分'
  }
}

/* 数字 格式化 */
export function nFormatter(num, digits) {
  const si = [
    { value: 1E18, symbol: 'E' },
    { value: 1E15, symbol: 'P' },
    { value: 1E12, symbol: 'T' },
    { value: 1E9, symbol: 'G' },
    { value: 1E6, symbol: 'M' },
    { value: 1E3, symbol: 'k' }
  ]
  for (let i = 0; i < si.length; i++) {
    if (num >= si[i].value) {
      return (num / si[i].value + 0.1).toFixed(digits).replace(/\.0+$|(\.[0-9]*[1-9])0+$/, '$1') + si[i].symbol
    }
  }
  return num.toString()
}