package com.dsh.course.util;

import java.text.ParseException;
import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;

/**
 * LocalDateTimeUtils
 * LocalDateTime 时间工具
 *
 * @author yudeshan
 * @version V1.0
 */
public class LocalDateTimeUtils {
    private final static int[] dayArr = new int[] { 20, 19, 21, 20, 21, 22, 23, 23, 23, 24, 23, 22 };
    private final static String[] constellationArr = new String[] { "摩羯座", "水瓶座", "双鱼座", "白羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天秤座", "天蝎座", "射手座", "摩羯座" };


    /**
     * 取两个时间相差毫秒数
     *
     * @param start 开始时间
     * @param end   结束时间
     * @return
     */
    public static long betweenMillis(LocalDateTime start, LocalDateTime end) {
        Duration duration = Duration.between(start, end);
        return duration.toMillis();
    }

    /**
     * 通过生日计算年龄
     * @param birthDay 生日
     * @return
     * @throws ParseException
     */
    public static int getAgeByBirth(LocalDate birthDay) throws ParseException {
        int age = 0;
       //出生日期晚于当前时间，无法计算
        LocalDate now=LocalDate.now();
        if (birthDay.isAfter(now)) {
            throw new IllegalArgumentException( "生日大于当前时间!");
        }
        //当前年份
        int yearNow = now.getYear();
        //当前月份
        int monthNow = now.getMonthValue();
        //当前日期
        int dayOfMonthNow = now.getDayOfMonth();

        int yearBirth =birthDay.getYear();
        int monthBirth = birthDay.getMonthValue();
        int dayOfMonthBirth = birthDay.getDayOfMonth();
        //计算整岁数
        age = yearNow - yearBirth;
        if (monthNow <= monthBirth) {
            if (monthNow == monthBirth) {
                if (dayOfMonthNow < dayOfMonthBirth){
                    //当前日期在生日之前，年龄减一
                    age--;
                }
            } else {
                //当前月份在生日之前，年龄减一
                age--;
            }
        }
        return age;
    }

    /**
     * 根据月份计算星座
     */

    public static String getConstellation(LocalDate date) {
        Integer month=date.getMonthValue();
        Integer day=date.getDayOfMonth();
        return day < dayArr[month - 1] ? constellationArr[month - 1] : constellationArr[month];
    }
}