package com.ruoyi.common.utils;

import java.lang.management.ManagementFactory;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;
import org.apache.commons.lang3.time.DateFormatUtils;

/**
 * 时间工具类
 * 
 * @author ruoyi
 */
public class DateUtils extends org.apache.commons.lang3.time.DateUtils
{
    // 固定东八区时区
    private static final ZoneId ZONE_ID = ZoneId.of("Asia/Shanghai");

    public static String YYYY = "yyyy";

    public static String YYYY_MM = "yyyy-MM";

    public static String YYYY_MM_DD = "yyyy-MM-dd";

    public static String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

    public static String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

    private static String[] parsePatterns = {
            "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM", 
            "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
            "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};

    /**
     * 获取当前Date型日期
     * 
     * @return Date() 当前日期
     */
    public static Date getNowDate()
    {
        return new Date();
    }

    /**
     * 获取当前日期, 默认格式为yyyy-MM-dd
     * 
     * @return String
     */
    public static String getDate()
    {
        return dateTimeNow(YYYY_MM_DD);
    }

    public static final String getTime()
    {
        return dateTimeNow(YYYY_MM_DD_HH_MM_SS);
    }

    public static final String dateTimeNow()
    {
        return dateTimeNow(YYYYMMDDHHMMSS);
    }

    public static final String dateTimeNow(final String format)
    {
        return parseDateToStr(format, new Date());
    }

    public static final String dateTime(final Date date)
    {
        return parseDateToStr(YYYY_MM_DD, date);
    }

    public static final String parseDateToStr(final String format, final Date date)
    {
        return new SimpleDateFormat(format).format(date);
    }

    public static final Date dateTime(final String format, final String ts)
    {
        try
        {
            return new SimpleDateFormat(format).parse(ts);
        }
        catch (ParseException e)
        {
            throw new RuntimeException(e);
        }
    }

    /**
     * 日期路径 即年/月/日 如2018/08/08
     */
    public static final String datePath()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyy/MM/dd");
    }

    /**
     * 日期路径 即年/月/日 如20180808
     */
    public static final String dateTime()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyyMMdd");
    }

    /**
     * 日期型字符串转化为日期 格式
     */
    public static Date parseDate(Object str)
    {
        if (str == null)
        {
            return null;
        }
        try
        {
            return parseDate(str.toString(), parsePatterns);
        }
        catch (ParseException e)
        {
            return null;
        }
    }

    /**
     * 获取服务器启动时间
     */
    public static Date getServerStartDate()
    {
        long time = ManagementFactory.getRuntimeMXBean().getStartTime();
        return new Date(time);
    }

    /**
     * 计算相差天数
     */
    public static int differentDaysByMillisecond(Date date1, Date date2)
    {
        return Math.abs((int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24)));
    }

    /**
     * 计算时间差
     *
     * @param endDate 最后时间
     * @param startTime 开始时间
     * @return 时间差（天/小时/分钟）
     */
    public static String timeDistance(Date endDate, Date startTime)
    {
        long nd = 1000 * 24 * 60 * 60;
        long nh = 1000 * 60 * 60;
        long nm = 1000 * 60;
        // long ns = 1000;
        // 获得两个时间的毫秒时间差异
        long diff = endDate.getTime() - startTime.getTime();
        // 计算差多少天
        long day = diff / nd;
        // 计算差多少小时
        long hour = diff % nd / nh;
        // 计算差多少分钟
        long min = diff % nd % nh / nm;
        // 计算差多少秒//输出结果
        // long sec = diff % nd % nh % nm / ns;
        return day + "天" + hour + "小时" + min + "分钟";
    }

    /**
     * 增加 LocalDateTime ==> Date
     */
    public static Date toDate(LocalDateTime temporalAccessor)
    {
        ZonedDateTime zdt = temporalAccessor.atZone(ZoneId.systemDefault());
        return Date.from(zdt.toInstant());
    }

    /**
     * 增加 LocalDate ==> Date
     */
    public static Date toDate(LocalDate temporalAccessor)
    {
        LocalDateTime localDateTime = LocalDateTime.of(temporalAccessor, LocalTime.of(0, 0, 0));
        ZonedDateTime zdt = localDateTime.atZone(ZoneId.systemDefault());
        return Date.from(zdt.toInstant());
    }

    /**
     * Date 转 LocalDateTime（东八区）
     */
    public static LocalDateTime dateToLocalDateTime(Date date) {
        if (date == null) {
            date=new Date();
        }
        return date.toInstant()
                .atZone(ZONE_ID)
                .toLocalDateTime();
    }


    /**
     * @param dateStr 日期字符串（需符合yyyy-MM-dd格式）
     * @return 转换后的Date对象，转换失败则返回null
     */
    public static Date stringToDateWithYmd(String dateStr,String format) {
        if (dateStr == null || dateStr.trim().isEmpty()) {
            return null;
        }
        try {
            return new SimpleDateFormat(format).parse(dateStr);
        } catch (ParseException e) {
            return null;
        }
    }

    /**
     * 添加1天
     * @param dateStr
     * @param inputFormat
     * @param outputFormat
     * @return
     */
    public static String addOneDay(String dateStr, String inputFormat, String outputFormat) {
        if (dateStr == null || dateStr.trim().isEmpty()
                || inputFormat == null || inputFormat.trim().isEmpty()
                || outputFormat == null || outputFormat.trim().isEmpty()) {
            System.err.println("参数错误：dateStr/inputFormat/outputFormat 不能为空");
            return null;
        }
        try {
            DateTimeFormatter inputFormatter = DateTimeFormatter.ofPattern(inputFormat.trim());
            DateTimeFormatter outputFormatter = DateTimeFormatter.ofPattern(outputFormat.trim());
            LocalDate date = LocalDate.parse(dateStr.trim(), inputFormatter);
            LocalDate nextDay = date.plusDays(1);
            return nextDay.format(outputFormatter);
        } catch (Exception e) {
            System.err.println("日期解析失败：输入字符串[" + dateStr + "] 与输入格式[" + inputFormat + "]不匹配");
            return null;
        }
    }

    /**
     * 获取3个月以后
     * @param fmt
     * @return
     */
    public static String getMonthThree(String fmt){
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, 3);
        Date now = new Date();
        Date threeMonthsLater = calendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat(fmt);
        System.out.println("当前时间：" + sdf.format(now));
        System.out.println("当前时间+3个月：" + sdf.format(threeMonthsLater));
        return sdf.format(threeMonthsLater);
    }
}
