package com.cjs.cms.util.lang;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * 日期工具类
 * 
 * @author 仝玉甫
 *
 */
public final class DateUtil {

    private static final Map<DateEnum, DateFormat> formats = new HashMap<DateEnum, DateFormat>();

    static {
        for (DateEnum date : DateEnum.values()) {
            formats.put(date, new SimpleDateFormat(date.getValue()));
        }
    }

    /**获取当前时间 yyyy-MM-dd HH:mm:ss */
    public static String getNow() {
        return formats.get(DateEnum.DATETIME).format(new Date());
    }

    /**获取当前时间*/
    public static String getNow(DateEnum format) {
        return formats.get(format).format(new Date());
    }

    /**转换字符串日期*/
    public static Date parseDate(String date, DateEnum format) {
        try {
            return formats.get(format).parse(date);
        } catch (ParseException e) {
            return null;
        }
    }

    /**日期转换成字符串*/
    public static String parseDate(Date date, DateEnum format) {
        return formats.get(format).format(date);
    }

    /**获取前一天日期*/
    public static String getBeforeDay(DateEnum format) {
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.DATE, -1);
        return formats.get(format).format(cal.getTime());
    }

    /**
     * 格式化日期为恒生的格式
     * @param startDate yyyy-MM-dd
     * @param endDate yyyy-MM-dd
     */
    public static void formatHundsunDate(Map<String, Object> params) {
        String startDate = StringUtil.castString(params.get("startDate"));
        String endDate = StringUtil.castString(params.get("endDate"));
        params.put("startDate", DateUtil.formatHundsunDate(startDate));
        params.put("endDate", DateUtil.formatHundsunDate(endDate));
    }

    /**
     * 格式化日期为恒生的格式
     * @param date yyyy-MM-dd
     * @return yyyyMMdd
     */
    public static String formatHundsunDate(String date) {
        if (StringUtil.isBlank(date)) {
            return "";
        }
        Date date2 = DateUtil.parseDate(date, DateEnum.DATE);
        return DateUtil.parseDate(date2, DateEnum.UNSIGNED_DATE);
    }

    /**
     * 计算二个时间之差
     * @param smdate
     * @param bdate
     * @return
     * @throws ParseException
     */
    public static int daysBetween(Date smdate, Date bdate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        smdate = sdf.parse(sdf.format(smdate));
        bdate = sdf.parse(sdf.format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return Integer.parseInt(String.valueOf(between_days));
    }
}