package com.zzg.common.utils;

import java.time.LocalDate;
import java.time.Period;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;

public class LocalDateUtils {

    /**
     * 年月日格式化方式
     */
    public static String YYYY = "yyyy";
    public static String YYYYY = "yyyy年";

    public static String YYYY_MM = "yyyy-MM";
    public static String YYYYYMMM = "yyyy年MM月";

    public static String YYYY_MM_DD = "yyyy-MM-dd";
    public static String YYYYYMMMDDD = "yyyy年MM月dd日";

    public static String YYYYMMDD = "yyyyMMdd";

    /**
     * 获取时间差（月份数和天数）
     *
     * @param startDate
     * @param endDate
     * @return
     */
    public static Map<String, Integer> timeDifference(LocalDate startDate, LocalDate endDate) {
        // 计算两个日期之间的差值
        Period period = Period.between(startDate, endDate);

        // 获取相差的月数和天数
        int diffMonths = period.getYears() * 12 + period.getMonths();
        int diffDays = period.getDays();
        Map<String, Integer> map = new HashMap<>();

        map.put("month", diffMonths);
        map.put("day", diffDays);

        return map;
    }

    /**
     * 时间格式转换
     * date转string(yyyy-MM-dd)
     *
     * @param date
     * @return
     */
    public static String localDateToString(LocalDate date) {
        return localDateToString(date, YYYY_MM_DD);
    }

    public static String localDateToString(LocalDate date, String formatter) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formatter);
        // 使用格式化器将 LocalDate 转换为字符串
        return date.format(dateTimeFormatter);
    }

    public static void main(String[] args) {
        // 假设有两个日期
        LocalDate startDate = LocalDate.of(2021, 1, 1);
        LocalDate endDate = LocalDate.of(2021, 5, 1);
        System.out.println(localDateToString(startDate, "yyyy年MM月"));
    }

}