package com.cku.restful.v1;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

import com.thinkgem.jeesite.common.utils.DateUtils;

public class DateMina {
	public static void main(String[] args) {

//		Calendar cl = Calendar.getInstance();
//		System.out.println("today is a 当年第" + cl.get(Calendar.WEEK_OF_YEAR) + "周");
//		System.out.println("today is a 当月第" + cl.get(Calendar.DAY_OF_MONTH) + "天");
//		System.out.println("today is a 当月第" + cl.get(Calendar.WEEK_OF_MONTH) + "周");
//
//		Calendar c = Calendar.getInstance();
//		c.set(Calendar.YEAR, 2021);
//		c.set(Calendar.MONTH, 11);
//		c.setFirstDayOfWeek(Calendar.MONDAY);
//		System.out.println(c.get(Calendar.YEAR) + "年" + (c.get(Calendar.MONTH) + 1) + "月");
//		System.out.println("天数：" + c.getActualMaximum(Calendar.WEEK_OF_YEAR));
//		System.out.println("Actual周数：" + c.getActualMaximum(Calendar.WEEK_OF_MONTH));
//		System.out.println("Max周数：" + c.getMaximum(Calendar.WEEK_OF_MONTH));

		Calendar c1 = Calendar.getInstance();
		c1.set(Calendar.YEAR, 2021);
		c1.set(Calendar.MONTH, Calendar.JANUARY);
		c1.set(Calendar.DAY_OF_YEAR, 1);
//		c1.setFirstDayOfWeek(Calendar.MONDAY);
		System.out.println(DateUtils.formatDate(c1.getTime(), "yyyy-MM-dd"));
		int currentYear = c1.get(Calendar.YEAR);
		Map<Integer, HashSet<Integer>> yearWeekMap = new HashMap<>();
		for (int i = 1; i <= 12; i++) {
			yearWeekMap.put(i, new HashSet<Integer>());
		}
		while (true) {
			yearWeekMap.get(c1.get(Calendar.MONTH) + 1).add(c1.get(Calendar.WEEK_OF_YEAR));
			c1.add(Calendar.DAY_OF_YEAR, 1);
			int newYear = c1.get(Calendar.YEAR);
			if (newYear > currentYear) {
				break;
			}
		}
		System.out.println("=============================================");
		yearWeekMap.keySet().stream().forEach(key -> {
			System.out.println("月份:" + key);
			yearWeekMap.get(key).stream().forEach(val -> {
				System.out.println("第" + val + "周");
			});
		});

	}

	public int getWeekCount(Date date) {
		// 获取日历类实例
		Calendar calendar = Calendar.getInstance();
		// 设置时间
		calendar.setTime(date);
		// 设置周一为每周第一天
		calendar.setFirstDayOfWeek(java.util.Calendar.MONDAY);
		// 返回当年最大周数
		return calendar.getActualMaximum(java.util.Calendar.WEEK_OF_YEAR);
	}
}