let weekArray = new Array("日", "一", "二", "三", "四", "五", "六").map(x=>`星期${x}`);

//格式化日期
const formatDate = (date = new Date()) => {
  const formatNumber = n => {
    n = n.toString()
    return n[1] ? n : '0' + n
  }

  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  return [year, month, day].map(formatNumber).join('-')
}
function formatTime(time) {
  if (typeof time !== 'number' || time < 0) {
    return time
  }

  const hour = parseInt(time / 3600, 10)
  time %= 3600
  const minute = parseInt(time / 60, 10)
  time = parseInt(time % 60, 10)
  const second = time

  return ([hour, minute, second]).map(function (n) {
    n = n.toString()
    return n[1] ? n : '0' + n
  }).join(':')
}
function formatDateTime(date, withMs = false) {

  function formatLeadingZeroNumber(n, digitNum = 2) {
    n = n.toString()
    const needNum = Math.max(digitNum - n.length, 0)
    return new Array(needNum).fill(0).join('') + n
  }

  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()
  const ms = date.getMilliseconds()

  let ret = [year, month, day].map(value => formatLeadingZeroNumber(value, 2)).join('-') +
    ' ' + [hour, minute, second].map(value => formatLeadingZeroNumber(value, 2)).join(':')
  if (withMs) {
    ret += '.' + formatLeadingZeroNumber(ms, 3)
  }
  return ret
}

function dateLaters(days, todate= new Date()) {
  var dateArry = [];
  for (var i = 0; i < days; i++) {
    var dateObj = dateLater(todate, i);
    dateArry.push(dateObj)
  }
  return dateArry;
}
function dateLater(dates, later=0) {
  let date = new Date(dates);
  date.setDate(date.getDate() + later);
  let day = date.getDay();
  let yearDate = date.getFullYear();
  let month = ((date.getMonth() + 1) < 10 ? ("0" + (date.getMonth() + 1)) : date.getMonth() + 1);
  let dayFormate = (date.getDate() < 10 ? ("0" + date.getDate()) : date.getDate());
  return [yearDate + '-' + month + '-' + dayFormate, weekArray[day]];
}
 


function formatLocation(longitude, latitude) {
  if (typeof longitude === 'string' && typeof latitude === 'string') {
    longitude = parseFloat(longitude)
    latitude = parseFloat(latitude)
  }

  longitude = longitude.toFixed(2)
  latitude = latitude.toFixed(2)

  return {
    longitude: longitude.toString().split('.'),
    latitude: latitude.toString().split('.')
  }
}
function getDateStr(today, addDayCount){
  var dd;
  if (today) {
    dd = new Date(today);
  } else {
    dd = new Date();
  }
  dd.setDate(dd.getDate() + addDayCount);//获取AddDayCount天后的日期 
  var y = dd.getFullYear();
  var m = dd.getMonth() + 1;//获取当前月份的日期 
  var d = dd.getDate();
  if (m < 10) {
    m = '0' + m;
  };
  if (d < 10) {
    d = '0' + d;
  };
  return y + "-" + m + "-" + d;
}

module.exports = {
  formatDate,
  formatTime,
  formatDateTime,
  dateLaters,
  dateLater,
  formatLocation,
  getDateStr
}