package org.springblade.jfpt.parcel.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

/**
 * 日期工具类
 */
public class DateUtils {

	/**
	 * 获取今天
	 * @return String
	 * */
	public static String getToday(){
		return new SimpleDateFormat("yyyy-MM-dd").format(new Date());
	}
	/**
	 * 获取昨天
	 * @return String
	 * */
	public static String getYestoday(){
		Calendar cal=Calendar.getInstance();
		cal.add(Calendar.DATE,-1);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本月开始日期
	 * @return String
	 * **/
	public static String getMonthStart(){
		Calendar cal=Calendar.getInstance();
		cal.add(Calendar.MONTH, 0);
		cal.set(Calendar.DAY_OF_MONTH, 1);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本月最后一天
	 * @return String
	 * **/
	public static String getMonthEnd(){
		Calendar cal=Calendar.getInstance();
		cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本周的第一天
	 * @return String
	 * **/
	public static String getWeekStart(){
		Calendar cal=Calendar.getInstance();
		cal.add(Calendar.WEEK_OF_MONTH, 0);
		cal.set(Calendar.DAY_OF_WEEK, 2);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本周的最后一天
	 * @return String
	 * **/
	public static String getWeekEnd(){
		Calendar cal=Calendar.getInstance();
		cal.set(Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK));
		cal.add(Calendar.DAY_OF_WEEK, 1);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本年的第一天
	 * @return String
	 * **/
	public static String getYearStart(){
		return new SimpleDateFormat("yyyy").format(new Date())+"-01-01";
	}

	/**
	 * 获取本年的最后一天
	 * @return String
	 * **/
	public static String getYearEnd(){
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.MONTH,calendar.getActualMaximum(Calendar.MONTH));
		calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
		Date currYearLast = calendar.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(currYearLast)+" 23:59:59";
	}

	/**
	 * 获取过去7天内的日期数组
	 * @return  日期数组
	 */
	public static ArrayList<String> pastDay(String time){
		ArrayList<String> pastDaysList = new ArrayList<>();
		try {
			//我这里传来的时间是个string类型的，所以要先转为date类型的。
			SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
			Date date = sdf.parse(time);
			for (int i = 6; i >= 0; i--) {
				pastDaysList.add(getPastDate(i,date));
			}
		}catch (ParseException e){
			e.printStackTrace();
		}
		return pastDaysList;
	}

	/**
	 * 获取过去第几天的日期
	 *
	 * @param past
	 * @return
	 */
	public static String getPastDate(int past,Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) - past);
		Date today = calendar.getTime();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		return sdf.format(today);
	}

	/**
	 * 获取时间段内每天的日期
	 *
	 * @param startDate 开始日期  yyyy-MM-dd HH:mm:ss
	 * @param endDate 结束日期 yyyy-MM-dd HH:mm:ss
	 * @return
	 */
	public static List<String> getTimeOverOneDate(String startDate, String endDate) {
		List<String> times = new ArrayList<>();
		try {
			if (startDate.length()<11){
				startDate = startDate+" 00:00:00";
				endDate = endDate+" 23:59:59";
			}
			Date startTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(startDate);
			Date endTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(endDate);
			int gap = (int) ((endTime.getTime() - startTime.getTime()) / (24*60*60*1000));
			times.clear();
			Calendar cld = Calendar.getInstance();
			cld.setTime(startTime);
			for (int i = 0; i < gap +1; i++) {
				times.add(new SimpleDateFormat("yyyy-MM-dd").format(cld.getTime()));
				cld.add(Calendar.DATE,1);
			}
			return times;
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return null;
	}

}