// 根据时间戳格式化时间为**分钟前，**天前这种格式
function getFormattedTime(timestamp) {
  let curTime = Date.parse(new Date()) / 1000;
  let delta = curTime - timestamp;
  const hour = 60 * 60;
  const day = 24 * hour;
  const month = 30 * day;
  const year = 12 * month;
  if (delta < hour) {
    // 显示多少分钟前
    let n = parseInt(delta / 60);
    if (n == 0) {
      return "刚刚";
    }
    return n + '分钟前';
  } else if (delta >= hour && delta < day) {
    return parseInt(delta / hour) + '小时前';
  } else if (delta >= day && delta < month) {
    return parseInt(delta / day) + '天前';
  } else if (delta >= month && delta < year) {
    return parseInt(delta / month) + '个月前';
  }
}

function format(date, fmt) {
  var o = {
    "M+": date.getMonth() + 1,                 //月份
    "d+": date.getDate(),                    //日
    "h+": date.getHours(),                   //小时
    "m+": date.getMinutes(),                 //分
    "s+": date.getSeconds(),                 //秒
    "q+": Math.floor((date.getMonth() + 3) / 3), //季度
    "S": date.getMilliseconds()             //毫秒
  };
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
  }
  for (var k in o) {
    if (new RegExp("(" + k + ")").test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    }
  }
  return fmt;
}

function formatChatTime(timestamp) {
  return format(new Date(timestamp * 1000), 'MM月dd日 hh:mm');
}

function currentTime() {
  return Date.parse(new Date()) / 1000;
}

module.exports = {
  getFormattedTime: getFormattedTime,
  formatChatTime: formatChatTime,
  currentTime: currentTime
}