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 年月日时分秒
	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];
}

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;

	//处理传过来的字符串转化为数组
	let dataArr = date.split(" ")[0].split('/')
	let time = date.split(" ")[1].split(':')

	// 默认开始显示数据 如果把自定义值传过来的话就使用自定义时间 否则用当前时间  ...dataArr数组解构
	var defaultDate = date ? [...dataArr, ...time] : getNewDateArry();
	// 处理联动列表数据
	/*年月日 时分秒*/
	dateTimeArray[0] = getLoopArray(start, end);
	dateTimeArray[1] = getLoopArray(1, 12);
	dateTimeArray[2] = getMonthDay(defaultDate[0], defaultDate[1]);
	dateTimeArray[3] = getLoopArray(0, 23);
	dateTimeArray[4] = getLoopArray(0, 59);
	dateTimeArray[5] = getLoopArray(0, 59);
	//遍历dateTimeArray数组
	dateTimeArray.forEach((current, index) => {
		//匹配defaultDate[index]值在current数组中的位置
		dateTime.push(current.indexOf(defaultDate[index]))
	});
	return {
		dateTimeArray: dateTimeArray,
		dateTime: dateTime
	}
}
module.exports = {
	dateTimePicker: dateTimePicker,
	getMonthDay: getMonthDay
}