[移动开发]周月季年换算（按每年48周）

package com.example.dateinvestigate;

import cn.hutool.core.date.DateField;
import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.date.Week;
import org.assertj.core.util.Lists;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.*;

@SpringBootTest
class DateInvestigateApplicationTests {

    // 归结为上一个单元的日期


    @Test
    void contextLoads() {
    }


    @Test
    void temp(){

        DateTime start = DateTime.of("2022-04-01", "yyyy-MM-dd");
        DateTime end = DateTime.of("2022-04-30", "yyyy-MM-dd");

        System.out.println(start.weekOfMonth());
        System.out.println(end.weekOfMonth());
    }

    List<DateTime> dateSplit(DateTime startDate, DateTime endDate){
        Long spi = endDate.getTime() - startDate.getTime();
        Long step = spi / (24 * 60 * 60 * 1000);// 相隔天数
        List<DateTime> dateList = new ArrayList();
        dateList.add(endDate);

        for (int i = 1; i <= step; i++) {
            dateList.add(new DateTime(dateList.get(i - 1).getTime()- (24 * 60 * 60 * 1000)));// 比上一天减一
        }

        Collections.reverse(dateList);
        return dateList;
    }

    @Test
    void iterOneYear(){
        DateTime start = DateTime.of("2022-01-01", "yyyy-MM-dd");
        DateTime end = DateTime.of("2022-12-31", "yyyy-MM-dd");
        List<DateTime> dateTimes = dateSplit(start,end);
        List<DateTime> lastDates = Lists.newArrayList();

        if(start.dayOfMonth() == 1 && start.dayOfWeekEnum()!=Week.MONDAY && start.month() == 0){
            //是每个月的第一天，但跨周了，属于上个月的第四周

            int dayWeek = start.dayOfWeek();
            if(dayWeek==1){
                dayWeek = 8;
            }

            DateTime weekBegin = DateUtil.offset(start, DateField.DAY_OF_WEEK, start.getFirstDayOfWeek().getValue() - dayWeek);
            DateTime weekEnd = DateUtil.offset(weekBegin, DateField.DAY_OF_WEEK, 6);
            // 从datetime到weekEnd变更为上一月的第四周
            lastDates = dateSplit(start,weekEnd);
        }

        List<DateTime> allYear = dateSplit(start, end);
        List<DateTime> lastYear = allYear.subList(0, lastDates.size());
        List<DateTime> nowYear = allYear.subList(lastDates.size(), allYear.size());

        List<RichDate> richDates = Lists.newArrayList();
        for (DateTime dateTime : lastYear) {
            RichDate richDate = new RichDate();
            richDate.setDate(dateTime.toDateStr());
            int weekDay = dateTime.dayOfWeek();
            // 西方周日开始转换为中过周一开始
            if(weekDay == 1){
                weekDay = 7;
            }else{
                weekDay = weekDay - 1;
            }
            richDate.setWeekday(weekDay);

            // 每年1月1日不在周一，则周跨月跨年了
            richDate.setSeasonOfYear(4);// 每年的第四季度
            richDate.setMonthOfSeason(3);// 第四季度的第三个月
            richDate.setWeekOfMonth(4);
            richDates.add(richDate);
        }

        // 从0开始计数
        int nums = 0;
        // 以下三个变量设置为-1，代表没有具体业务含义的初始值
        int weekOfMonth = -1;
        int monthOfSeason = -1;
        int seasonOfYear = -1;
        for (DateTime dateTime : nowYear) {

            RichDate richDate = new RichDate();
            richDate.setDate(dateTime.toDateStr());
            int weekDay = dateTime.dayOfWeek();
            // 西方周日开始转换为中过周一开始
            if(weekDay == 1){
                weekDay = 7;
            }else{
                weekDay = weekDay - 1;
            }
            richDate.setWeekday(weekDay);

            weekOfMonth = (nums/7)%4+1 ;
            richDate.setWeekOfMonth(weekOfMonth);


            monthOfSeason = (nums%(3*28)/28)+1;
            richDate.setMonthOfSeason(monthOfSeason);

            seasonOfYear = (nums/(3*28))%4+1;
            richDate.setSeasonOfYear(seasonOfYear);

            richDates.add(richDate);
            nums++;
        }

        richDates.forEach(System.out::println);
    }

}

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