function withData(param){
  return param < 10 ? '0' + param : '' + param;
}
function getLoopArray(start,end){
  var start = start || 0;
  var end = end || 1;
  var array = [];
  for (var i = start; i <= end; i++) {
    array.push(withData(i));
  }
  return array;
}
function getMonthDay(year,month){
  var flag = year % 400 == 0 || (year % 4 == 0 && year % 100 != 0), array = null;

  switch (month) {
    case '01':
    case '03':
    case '05':
    case '07':
    case '08':
    case '10':
    case '12':
      array = getLoopArray(1, 31)
      break;
    case '04':
    case '06':
    case '09':
    case '11':
      array = getLoopArray(1, 30)
      break;
    case '02':
      array = flag ? getLoopArray(1, 29) : getLoopArray(1, 28)
      break;
    default:
      array = '月份格式不正确，请重新输入！'
  }
  return array;
}
function getNewDateArry(){
  // 当前时间的处理
  var newDate = new Date();
  var year = withData(newDate.getFullYear()),
      mont = withData(newDate.getMonth() + 1),
      date = withData(newDate.getDate()),
      hour = withData(newDate.getHours()),
      minu = withData(newDate.getMinutes()),
      seco = withData(newDate.getSeconds());

  return [year, mont, date, hour, minu, seco];
}

// 处理时间格式
function formatDate(dateArray,type){
  switch (type) {
    case 'year':
      dateArray = dateArray.map(item => item = `${item}年`)
      break;
    case 'month':
      dateArray = dateArray.map(item => item = `${item}月`)
      break;
    case 'day':
      dateArray = dateArray.map(item => item = `${item}日`)
      break;
    default:
      dateArray = dateArray
  }
  return dateArray
};

function dateTimePicker(startYear,endYear,date) {
  // 返回默认显示的数组和联动数组的声明
  var dateTime = [], dateTimeArray = [[],[],[]];
  var start = startYear || 1978;
  var end = endYear || 2100;
  // 默认开始显示数据
  var defaultDate = date ? [...date.split(' ')[0].split('-'), ...date.split(' ')[1].split(':')] : getNewDateArry();
  // 处理联动列表数据
  /*年月日 时分秒*/ 
  dateTimeArray[0] = formatDate(getLoopArray(start,end), 'year');
  dateTimeArray[1] = formatDate(getLoopArray(1, 12),'month');
  dateTimeArray[2] = formatDate(getMonthDay(defaultDate[0], defaultDate[1]),'day');
  // dateTimeArray[3] = getLoopArray(0, 23);
  // dateTimeArray[4] = getLoopArray(0, 59);
  // dateTimeArray[5] = getLoopArray(0, 59);

  dateTimeArray.forEach((current,index) => {
    dateTime.push(current.indexOf(defaultDate[index]));
  });

  return {
    dateTimeArray: dateTimeArray,
    dateTime: dateTime
  }
}
module.exports = {
  dateTimePicker: dateTimePicker,
  getMonthDay: getMonthDay
}