package com.os.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.time.temporal.ChronoUnit;
import java.util.*;

import org.apache.commons.lang3.time.DateFormatUtils;

import static org.hibernate.validator.internal.engine.messageinterpolation.el.RootResolver.FORMATTER;

/**
 * 时间工具类
 * 
 * @author ruoyi
 */
public class DateUtils extends org.apache.commons.lang3.time.DateUtils
{
    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";

    public 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());
    }

    /**
     * 生成两个日期之间的每个时间点（支持小时、日、月、年）
     * 假设：输入格式与粒度匹配：
     * HOURS  -> yyyy-MM-dd HH:mm:ss
     * DAYS   -> yyyy-MM-dd
     * MONTHS -> yyyy-MM
     * YEARS  -> yyyy
     *
     * @param startDateStr 开始时间字符串
     * @param endDateStr   结束时间字符串
     * @param unit         时间粒度（支持 HOURS, DAYS, MONTHS, YEARS）
     */
    public static List<String> getTimeIntervals(String startDateStr, String endDateStr, String unit) {
        String pattern;
        int calendarField;
        switch (unit) {
            case "19":
                pattern = "yyyy-MM-dd HH:mm:ss";
                calendarField = Calendar.HOUR_OF_DAY;
                break;
            case "10":
                pattern = "yyyy-MM-dd";
                calendarField = Calendar.DAY_OF_MONTH;
                break;
            case "7":
                pattern = "yyyy-MM";
                calendarField = Calendar.MONTH;
                break;
            case "4":
                pattern = "yyyy";
                calendarField = Calendar.YEAR;
                break;
            default:
                throw new IllegalArgumentException("Unsupported unit: " + unit);
        }

        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        List<String> intervals = new ArrayList<>();

        try {
            Calendar start = Calendar.getInstance();
            start.setTime(sdf.parse(startDateStr));

            Calendar end = Calendar.getInstance();
            end.setTime(sdf.parse(endDateStr));

            while (!start.after(end)) {
                intervals.add(sdf.format(start.getTime()));
                start.add(calendarField, 1);
            }
        } catch (ParseException e) {
            throw new RuntimeException("日期解析失败: " + e.getMessage(), e);
        }

        return intervals;
    }


    /**
     * 获取时间范围信息
     * @return 包含各种时间范围的Map
     */
    public static Map<String, String> getDateTimeRanges() {
        Map<String, String> timeMap = new HashMap<>();
        String nowDateTime = LocalDateTime.now()
                .withMinute(0)
                .withSecond(0)
                .format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:00:00"));
        //当前时间
        timeMap.put("currentTime", nowDateTime);

        String lastYearDateTime = LocalDateTime.now()
                .minusYears(1)  // 关键修改：减去1年
                .withMinute(0)
                .withSecond(0)
                .withNano(0)
                .format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:00:00"));
        timeMap.put("lastYearCurrentTime", lastYearDateTime);

        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime now = LocalDateTime.now();

        // 当天开始时间 (00:00:00)
        LocalDateTime todayStart = now.toLocalDate().atStartOfDay();
        timeMap.put("todayStart", todayStart.format(formatter));
        // 当月开始时间 (当月1日 00:00:00)
        LocalDateTime monthStart = now.withDayOfMonth(1).toLocalDate().atStartOfDay();
        timeMap.put("monthStart", monthStart.format(formatter));
        // 当年开始时间 (当年1月1日 00:00:00)
        LocalDateTime yearStart = now.withDayOfYear(1).toLocalDate().atStartOfDay();
        timeMap.put("yearStart", yearStart.format(formatter));
        // 去年当天开始时间
        LocalDateTime lastYearTodayStart = todayStart.minusYears(1);
        timeMap.put("lastYearTodayStart", lastYearTodayStart.format(formatter));
        // 去年当月开始时间
        LocalDateTime lastYearMonthStart = monthStart.minusYears(1);
        timeMap.put("lastYearMonthStart", lastYearMonthStart.format(formatter));
        // 去年当年开始时间
        LocalDateTime lastYearYearStart = yearStart.minusYears(1);
        timeMap.put("lastYearYearStart", lastYearYearStart.format(formatter));
        return timeMap;
    }

    /**
     * 获取去年同时间的日期字符串
     * @param dateTimeStr 格式必须为 "yyyy-MM-dd HH:mm:ss"
     * @return 去年同时间的字符串，格式相同
     */
    public static String getLastYearDateTime(String dateTimeStr)  {
        // 定义日期时间格式
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        // 解析字符串为 LocalDateTime
        LocalDateTime dateTime = LocalDateTime.parse(dateTimeStr, formatter);
        // 减去一年
        LocalDateTime lastYearDateTime = dateTime.minusYears(1);
        // 格式化为字符串返回
        return lastYearDateTime.format(formatter);
    }

}