# 好用的DateUtil

package com.camiol.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

import org.apache.activemq.filter.function.splitFunction;
import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * 處理Date相關共用函數
 * 
 * @author
 */
public class DateUtil implements java.io.Serializable {

    private static final long serialVersionUID = 1L;
    private static final Logger log = LogManager.getLogger(DateUtil.class);

    /**
     * 字串 轉換成 日期(Date型態)。 例：getDate("2010-06-10 17:30:25", "yyyy-MM-dd HH:mm:ss")
     * 
     * @param strDate 日期字串
     * @param pattern 日期格式
     * @return Date
     * @author Nicklee 2021/04/12
     */
    public static Date getDate(String strDate, String pattern) {

        Date date = null;
        try {
            SimpleDateFormat dateFt = new SimpleDateFormat(pattern);
            date = dateFt.parse(strDate);
        } catch (ParseException e) {
            log.warn("DateUtil.getDate(strDate, pattern) Error! Exception: ", e);
        }
        return date;
    }

    /**
     * 日期 轉換成 字串。例： "yyyy-MM-dd HH:mm:ss"
     * 
     * @param date 日期
     * @param pattern 日期格式
     * @return String
     * @author nicklee 2021/04/12
     */
    public static String getDate(Date date, String pattern) {

        String sDate = null;
        try {
            SimpleDateFormat dateFt = new SimpleDateFormat(pattern);
            sDate = dateFt.format(date);
        } catch (IllegalArgumentException e) {
            log.warn("DateUtil.getDate(date, pattern) Error! IllegalArgumentException: ", e);
        } catch (NullPointerException e) {
            log.warn("DateUtil.getDate(date, pattern) Error! NullPointerException : ", e);
        } catch (Exception e) {
            log.warn("DateUtil.getDate(date, pattern) Error! Exception: ", e);
        }
        return sDate;
    }

    /**
     * 處理起始日期轉換為timestamp
     * 
     * @param date 日期
     * @return long
     * @author nicklee 2021/04/23
     */
    public static long getStartDate(String date, String pattern) {

        date = date + " " + Const.DATE_FORMAT_START; // 先加00:00:00

        Date firstDate = getDate(date, pattern); // 將原始傳入日期字串轉換為日期

        return firstDate.getTime();
    }

    /**
     * 處理起始日期轉換為timestamp
     * 
     * @param date 日期
     * @return long
     * @author nicklee 2021/04/23
     */
    public static long getStartEnd(String date, String pattern) {

        date = date + " " + Const.DATE_FORMAT_END; // 先加00:00:00

        Date firstDate = getDate(date, pattern); // 將原始傳入日期字串轉換為日期

        return firstDate.getTime();
    }

    public static String converseInstantToDateStr(String times) {
        DateTimeFormatter dtfDate = DateTimeFormatter.ofPattern("yyyyMMdd").withZone(ZoneId.systemDefault());

        String[] timesArray = times.split("\\.");

        if (timesArray.length > 1) {
            Instant inst = Instant.ofEpochSecond(Long.parseLong(timesArray[0]), Long.parseLong(timesArray[1]));

            return dtfDate.format(inst);
        }

        return null;
    }

    public static String converseInstantToTimeStr(String times) {
        DateTimeFormatter dtfTime = DateTimeFormatter.ofPattern("HHmmss").withZone(ZoneId.systemDefault());

        String[] timesArray = times.split("\\.");

        if (timesArray.length > 1) {
            Instant inst = Instant.ofEpochSecond(Long.parseLong(timesArray[0]), Long.parseLong(timesArray[1]));

            return dtfTime.format(inst);
        }

        return null;
    }


    public static String converseZoneDateTimeToDateStr(String times) {
        SimpleDateFormat sdfDate = new SimpleDateFormat("yyyyMMdd");

        ZonedDateTime dateTime = ZonedDateTime.parse(times);

        long offsetMillis = ZoneOffset.from(dateTime).getTotalSeconds() * 1000;
        long isoMillis = dateTime.toInstant().toEpochMilli();
        Date date = new Date(isoMillis + offsetMillis);

        return sdfDate.format(date);
    }

    public static String converseZoneDateTimeToTimeStr(String times) {
        SimpleDateFormat sdfTime = new SimpleDateFormat("HHmmss");

        ZonedDateTime dateTime = ZonedDateTime.parse(times);

        long offsetMillis = ZoneOffset.from(dateTime).getTotalSeconds() * 1000;
        long isoMillis = dateTime.toInstant().toEpochMilli();
        Date date = new Date(isoMillis + offsetMillis);

        return sdfTime.format(date);
    }

    //按照指定的時間格式來相減後回傳毫秒差
    public static long diffDateTime(String dateStrBegin, String dateStrEnd , SimpleDateFormat sdf) {

        if (StringUtils.isBlank(dateStrBegin) || StringUtils.isBlank(dateStrEnd)) {
            return 0;
        }

        long millisecond = 0;

        Date dateBegin = null;
        Date dateEnd = null;
        try {
            dateBegin = sdf.parse(dateStrBegin);
            dateEnd = sdf.parse(dateStrEnd);
        } catch (ParseException e) {
        	log.info("e: {}", e);
        }

        if (dateBegin != null && dateEnd != null) {
            millisecond = dateEnd.getTime() - dateBegin.getTime();
        }

        return millisecond;
    }
}