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package com.majiaxueyuan.util;

import java.text.Format;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {

	/**
	 * format Date to YYYYmmdd
	 * 
	 * @param date date
	 */
	public static String formatYYYYMMDD(Date date) {
		Format format = new SimpleDateFormat("yyyyMMdd");
		String format2 = format.format(date);
		return format2;
	}

	/**
	 * To Check date Is Today?
	 * 
	 * @param date date
	 */
	public static boolean isToday(Date date) {
		Calendar toCheckCalendar = Calendar.getInstance();
		toCheckCalendar.setTime(date);
		Calendar todayCalendar = Calendar.getInstance();
		todayCalendar.setTimeInMillis(System.currentTimeMillis());
		if (toCheckCalendar.get(Calendar.DATE) == todayCalendar.get(Calendar.DATE)) {
			return true;
		}
		return false;
	}

	/**
	 * Get LastDay in WhichMonth
	 * 
	 * @param yyyyMM eg:201903
	 * @throws ParseException
	 */
	public static Date getLastDate(String yyyyMM) throws ParseException {
		SimpleDateFormat format2 = new SimpleDateFormat("yyyyMM");
		Calendar ca = Calendar.getInstance();
		ca.setTime(format2.parse(yyyyMM));
		ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));
		Date time = ca.getTime();
		return time;
	}

	/**
	 * Get LastDay in WhichMonth
	 * 
	 * @param thisDate thisDate
	 */
	public static Date getLastDate(Date thisDate) {
		Calendar ca = Calendar.getInstance();
		ca.setTime(thisDate);
		ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));
		Date time = ca.getTime();
		return time;
	}

	/**
	 * Get FirstDay in WhichMonth
	 * 
	 * @param yyyyMM eg 201903
	 */
	public static Date getFirstDate(String yyyyMM) throws ParseException {
		SimpleDateFormat format2 = new SimpleDateFormat("yyyyMM");
		Calendar c = Calendar.getInstance();
		c.setTime(format2.parse(yyyyMM));
		c.set(Calendar.DAY_OF_MONTH, 1);
		return c.getTime();
	}

	/**
	 * Get FirstDay in WhichMonth
	 * 
	 * @param thisDate thisDate
	 */
	public static Date getFirstDate(Date thisDate) {
		Calendar c = Calendar.getInstance();
		c.setTime(thisDate);
		c.set(Calendar.DAY_OF_MONTH, 1);
		return c.getTime();
	}

	/**
	 * Get days Between two Date
	 * 
	 * @param startDate startDate
	 * @param endDate endDate
	 */
	public static int getBetweenDays(Date startDate, Date endDate) {
		Calendar cal1 = Calendar.getInstance();
		cal1.setTime(startDate);

		Calendar cal2 = Calendar.getInstance();
		cal2.setTime(endDate);
		int day1 = cal1.get(Calendar.DAY_OF_YEAR);
		int day2 = cal2.get(Calendar.DAY_OF_YEAR);

		int year1 = cal1.get(Calendar.YEAR);
		int year2 = cal2.get(Calendar.YEAR);
		if (year1 != year2) {
			int timeDistance = 0;
			for (int i = year1; i < year2; i++) {
				if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) {
					timeDistance += 366;
				} else {
					timeDistance += 365;
				}
			}
			return timeDistance + (day2 - day1) + 1;
		} else {
			return day2 - day1 + 1;
		}
	}
}