function formatTime(date) {
  var year = date.getFullYear()
  var month = date.getMonth() + 1
  var day = date.getDate()

  var hour = date.getHours()
  var minute = date.getMinutes()
  var second = date.getSeconds()


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

function formatDate(date) {
    var year = date.getFullYear()
    var month = date.getMonth() + 1
    var day = date.getDate()

    return [year, month, day].map(formatNumber).join('-');
}

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

/**
 * 判断两个日期相差天数
 */
function getDays(strDateStart, strDateEnd) {
    var strSeparator = "-"; //日期分隔符
    var oDate1;
    var oDate2;
    var iDays;
    oDate1 = strDateStart.split(strSeparator);
    oDate2 = strDateEnd.split(strSeparator);
    var strDateS = new Date(oDate1[0], oDate1[1] - 1, oDate1[2]);
    var strDateE = new Date(oDate2[0], oDate2[1] - 1, oDate2[2]);
    iDays = parseInt(Math.abs(strDateS - strDateE) / 1000 / 60 / 60 / 24)//把相差的毫秒数转换为天数 
    return iDays;
}

function dateToString(now) {
    var year = now.getFullYear();
    var month = (now.getMonth() + 1).toString();
    var day = (now.getDate()).toString();
    if (month.length == 1) {
        month = "0" + month;
    }
    if (day.length == 1) {
        day = "0" + day;
    }
    var dateTime = year + "-" + month + "-" + day ;
    return dateTime;
}  


//一定概率执行处理，N是概率，例如：七分之一，n就是7
const randomJudgeDo = n => {
    var randomValue = Math.floor(Math.random() * n) + 1;
    console.log("====randomJudgeDo===" + n + "|" + randomValue);
    if (randomValue == n) {
        return true;
    } else {
        return false;
    }
}

function getRandomCode() {
    var chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
    var nums = "";
    for (var i = 0; i < 32; i++) {
        var id = parseInt(Math.random() * 61);
        nums += chars[id];
    }
    return nums;
}  


const isNull = str => {
    if (str == null || str == undefined || str == '') {
        return true;
    } else {
        return false;
    }
}


module.exports = {
  formatTime: formatTime,
  randomJudgeDo: randomJudgeDo,
  getRandomCode: getRandomCode,
  getRandomNum: getRandomCode,
  isNull: isNull,
  getDays: getDays,
  dateToString: dateToString,
  formatDate: formatDate,
}