package com.dsh.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.util.Assert;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Duration;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

/**
 * @author: lihong .
 * @email: lihongvst@foxmail.com .
 * @createTime: 2019/6/26 18:02  .
 * @describe: 时间工具类.
 **/
@Slf4j
public final class DateUtils {
    public static final String yyyy_MM_dd_HH_mm_ss = "yyyy-MM-dd HH:mm:ss";
    public static final String yy_LINK_MM = "yyMM";
    public static final String yyyy_MM_dd = "yyyy-MM-dd";


    /**
     * 格式化时间
     *
     * @param localDateTime
     * @param parse
     * @return
     */
    public static String parseDate(LocalDateTime localDateTime, String parse) {
        return localDateTime.format(DateTimeFormatter.ofPattern(parse));
    }

    /**
     * 时间转时间
     *
     * @param date
     * @param parse
     * @return
     */
    public static Date dateToDate(Date date, String parse) {
        SimpleDateFormat sdf = new SimpleDateFormat(parse);
        try {
            return sdf.parse(sdf.format(date));
        } catch (ParseException e) {
            e.printStackTrace();
            log.error("格式化时间异常, date:{}, parse:{}", date, parse);
        }
        return null;
    }


    /**
     * 差值计算
     *
     * @param startTime
     * @param endTime
     * @return 毫秒
     */
    public static long diff(LocalDateTime startTime, LocalDateTime endTime) {
        Assert.notNull(startTime, "开始时间不能为空.");
        Assert.notNull(endTime, "结束时间不能为空");
        Duration duration = Duration.between(startTime, endTime);
        return duration.toMillis();
    }

    /**
     * 根据给出的Date值和格式串采用操作系统的默认所在的国家风格来格式化时间，并返回相应的字符串
     *
     * @param date
     * @param formatStr
     * @return 如果为null，返回字符串""
     */
    public static String formatDateTimeToString(Date date, String formatStr) {
        String reStr = "";
        if (date == null || formatStr == null || formatStr.trim().length() < 1) {
            return reStr;
        }
        SimpleDateFormat sdf = new SimpleDateFormat();
        sdf.applyPattern(formatStr);
        reStr = sdf.format(date);
        return reStr;
    }

}