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('/')} ${[hour, minute, second].map(formatNumber).join(':')}`
}
const formatDate = date =>{
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  return `${[year, month, day].map(formatNumber).join('-')}`
}
const formatTime_a = date =>{
  const hour = date.getHours()
  const minute = date.getMinutes()
  return `${[hour, minute].map(formatNumber).join(':')}`
}
const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : `0${n}`
}
const getend = later =>{
  let currentdate = new Date();
  currentdate.setDate(currentdate.getDate() + later);
  return formatDate(currentdate)
}
function getDateDiff(dateTime) {
  let dateTimeStamp = new Date(dateTime).getTime();
  let result = '';
  let minute = 1000 * 60;
  let hour = minute * 60;
  let day = hour * 24;
  let halfamonth = day * 15;
  let month = day * 30;
  let year = day * 365;
  let now = new Date().getTime();
  let diffValue = now - dateTimeStamp;
  if (diffValue < 0) {
    return;
  }
  let monthEnd = diffValue / month;
  let weekEnd = diffValue / (7 * day);
  let dayEnd = diffValue / day;
  let hourEnd = diffValue / hour;
  let minEnd = diffValue / minute;
  let yearEnd = diffValue / year;
  if (yearEnd >= 1) {
    result = dateTime;
  } else if (monthEnd >= 1) {
    result = dateTime;
  } else if (dayEnd >= 4) {
    result = dateTime;
  } else if ((dayEnd >= 1)&&(dayEnd<=3)){
    result = "" + parseInt(dayEnd) + "天前";
  } else if (hourEnd >= 1) {
    result = "" + parseInt(hourEnd) + "小时前";
  } else if (minEnd >= 1) {
    result = "" + parseInt(minEnd) + "分钟前";
  } else {
    result = "刚刚";
  }
  return result;
}

module.exports = {
  formatTime,
  formatDate,
  getend,
  formatTime_a,
  getDateDiff: getDateDiff
}