var now = new Date(); // 当前日期
var nowDayOfWeek = now.getDay(); // 今天本周的第几天
var nowDay = now.getDate(); // 当前日
var nowMonth = now.getMonth(); // 当前月
var nowYear = now.getYear(); // 当前年
nowYear += (nowYear < 2000) ? 1900 : 0;

module.exports = {
	/**
	 * 获得近几天的日期
	 * 
	 * @returns
	 */
	getDayList(day, fmt) {
		//设置日期，当前日期的前七天
		var myDate = new Date(); //获取今天日期
		myDate.setDate(myDate.getDate() - day + 1);
		var dateArray = [];
		var dateTemp;
		var flag = 1;
		for (var i = 0; i < day; i++) {
			dateTemp = this.formatDate(myDate, fmt);
			dateArray.push(dateTemp);
			myDate.setDate(myDate.getDate() + flag);
		}
		return dateArray;
	},

	/**
	 * 获得当前日期
	 * 
	 * @returns
	 */
	getNowDay(fmt) {
		return this.formatDate(new Date(), fmt);
	},
	/**
	 * 获得本周的开始时间
	 * 
	 * @returns
	 */
	getStartDayOfWeek(fmt) {
		var day = nowDayOfWeek || 7;
		return this.formatDate(new Date(now.getFullYear(), nowMonth, nowDay + 1 - day), fmt);
	},
	/**
	 * 获得本周的结束时间
	 * 
	 * @returns
	 */
	getEndDayOfWeek(fmt) {
		var day = nowDayOfWeek || 7;
		return this.formatDate(new Date(now.getFullYear(), nowMonth, nowDay + 7 - day), fmt);
	},
	/**
	 * 获得本月的开始时间
	 * 
	 * @returns
	 */
	getStartDayOfMonth(fmt) {
		var monthStartDate = new Date(nowYear, nowMonth, 1);
		return this.formatDate(monthStartDate, fmt);
	},
	/**
	 * 获得本月的结束时间
	 * 
	 * @returns
	 */
	getEndDayOfMonth(fmt) {
		var monthEndDate = new Date(nowYear, nowMonth, this.getMonthDays());
		return this.formatDate(monthEndDate, fmt);
	},
	/**
	 * 获得本月天数
	 * 
	 * @returns
	 */
	getMonthDays() {
		var monthStartDate = new Date(nowYear, nowMonth, 1);
		var monthEndDate = new Date(nowYear, nowMonth + 1, 1);
		var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
		return days;
	},

	formatTime(time, option) {
		const d = new Date(time.replace(/-/g, '/'))
		const now = Date.now()

		const diff = (now - d) / 1000

		if (diff < 30) {
			return '刚刚'
		} else if (diff < 3600) {
			// less 1 hour
			return Math.ceil(diff / 60) + '分钟前'
		} else if (diff < 3600 * 24) {
			return Math.ceil(diff / 3600) + '小时前'
		} else if (diff < 3600 * 24 * 2) {
			return '1天前'
		}
		if (option) {
			return this.formatDate(time, option)
		} else {
			return (
				d.getMonth() +
				1 +
				'月' +
				d.getDate() +
				'日' +
				d.getHours() +
				'时' +
				d.getMinutes() +
				'分'
			)
		}
	},
	/**
	 * @param 日期格式化
	 * @returns {String}
	 */
	formatDate(date, fmt) {
		if (!date) {
			return
		}
		if (!fmt) {
			fmt = 'yyyy-MM-dd'
		}
		if (!(date instanceof Date)) {
			date = new Date(date.replace(/-/g, '/'))
		}

		if (/(y+)/.test(fmt)) {
			fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
		}

		let o = {
			'M+': date.getMonth() + 1,
			'd+': date.getDate(),
			'h+': date.getHours(),
			'm+': date.getMinutes(),
			's+': date.getSeconds()
		};

		for (let k in o) {
			if (new RegExp(`(${k})`).test(fmt)) {
				let str = o[k] + '';
				fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : ('00' + str).substr(str.length));
			}
		}
		return fmt;
	}
};