package com.appsafe.core.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Date Utility Class This is used to convert Strings to Dates and Timestamps
 * 
 * <p>
 * <a href="DateUtil.java.html"><i>View Source</i></a>
 * </p>
 * 
 * @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a> Modified by
 *         <a href="mailto:dan@getrolling.com">Dan Kibler </a> to correct time
 *         pattern. Minutes should be mm not MM (MM is month).
 * @version $Revision: 1.5 $ $Date: 2004/10/05 07:20:13 $
 */
public class DateUtil {
	// ~ Static fields/initializers
	// =============================================

	private static Log log = LogFactory.getLog(DateUtil.class);

	private static String datePattern = "MM/dd/yyyy";

	private static String timePatternHHmm = "HH:mm";

	private static String timePatternHHmmss = "HH:mm:ss";

	// private static String datepa = "yyyy-MM-dd";

	private static String datePatternyyyyMMdd = "yyyyMMdd";

	private static String datePatternyyMMdd = "yyMMdd";

	private static String datePatternyy_MM_dd = "yyyy-MM-dd";

	private static String datePattern_date_time = "yyyy-MM-dd HH:mm:ss";

	private static String datePatternyyMMddhhmmss = "yyyyMMddHHmmss";

	// ~ Methods
	// ================================================================

	/**
	 * Return default datePattern (MM/dd/yyyy)
	 * 
	 * @return a string representing the date pattern on the UI
	 */
	public static String getDatePattern() {
		return datePattern;
	}

	/**
	 * This method attempts to convert an Oracle-formatted date in the form
	 * dd-MMM-yyyy to mm/dd/yyyy.
	 * 
	 * @param aDate
	 *            date from database as a string
	 * @return formatted string for the ui
	 */
	public static final String getDate(Date aDate) {
		SimpleDateFormat df = null;
		String returnValue = "";

		if (aDate != null) {
			df = new SimpleDateFormat(datePattern);
			returnValue = df.format(aDate);
		}

		return (returnValue);
	}

	public static final String getNowDate() {
		SimpleDateFormat df = null;
		String returnValue = "";
		Date aDate = new Date();
		if (aDate != null) {
			df = new SimpleDateFormat(datePatternyy_MM_dd);
			returnValue = df.format(aDate);
		}

		return (returnValue);
	}

	/**
	 * 取月份
	 */
	public static final String getMonth(String time) {
		SimpleDateFormat df = null;
		String returnValue = "";
		try {
			Date aDate = convertStringToDate(time);
			if (aDate != null) {
				df = new SimpleDateFormat("yyyy年MM月");
				returnValue = df.format(aDate);
			}
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return (returnValue);
	}

	/**
	 * This method attempts to convert an Oracle-formatted date in the form
	 * yyyyMMdd
	 * 
	 * @return
	 */

	public static final String getNowyyyyMMddDate() {
		SimpleDateFormat df = null;
		String returnValue = "";
		Date aDate = new Date();
		if (aDate != null) {
			df = new SimpleDateFormat(datePatternyyyyMMdd);
			returnValue = df.format(aDate);
		}

		return (returnValue);
	}

	/**
	 * This method attempts to convert an Oracle-formatted date in the form
	 * yyyy-MM-dd HH:mm:ss
	 * 
	 * @return
	 */

	public static final String getNowDateTime() {
		SimpleDateFormat df = null;
		String returnValue = "";
		Date aDate = new Date();
		if (aDate != null) {
			df = new SimpleDateFormat(datePattern_date_time);
			returnValue = df.format(aDate);
		}

		return (returnValue);
	}

	/**
	 * yyyyMMdd
	 * 
	 * @param date
	 * @return
	 */
	public static final String formatyyyyMMdd(String date) {
		SimpleDateFormat df = null;
		String returnValue = "";
		if (date != null) {
			df = new SimpleDateFormat(datePatternyyyyMMdd);
			try {
				returnValue = df.format(convertStringToDate(date));
			} catch (ParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		return (returnValue);
	}

	public static final String formatyyMMdd(String date) {
		SimpleDateFormat df = null;
		String returnValue = "";
		if (date != null) {
			df = new SimpleDateFormat(datePatternyyMMdd);
			try {
				returnValue = df.format(convertStringToDate(date));
			} catch (ParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		return (returnValue);
	}

	public static final String formatyyyy_MM_dd(String date) {
		SimpleDateFormat df = null;
		String returnValue = "";
		if (date != null) {
			df = new SimpleDateFormat(datePatternyy_MM_dd);
			try {
				returnValue = df.format(convertStringToDate(date));
			} catch (ParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		return (returnValue);
	}

	/**
	 * This method generates a string representation of a date/time in the
	 * format you specify on input
	 * 
	 * @param aMask
	 *            the date pattern the string is in
	 * @param strDate
	 *            a string representation of a date
	 * @return a converted Date object
	 * @see java.text.SimpleDateFormat
	 * @throws ParseException
	 */
	public static final Date convertStringToDate(String aMask, String strDate)
			throws ParseException {
		SimpleDateFormat df = null;
		Date date = null;
		df = new SimpleDateFormat(aMask);

		if (log.isDebugEnabled()) {
			log.debug("converting '" + strDate + "' to date with mask '"
					+ aMask + "'");
		}

		try {
			date = df.parse(strDate);
		} catch (ParseException pe) {
			// log.error("ParseException: " + pe);
			throw new ParseException(pe.getMessage(), pe.getErrorOffset());
		}

		return (date);
	}

	/**
	 * This method returns the current date time in the format: HH:MM a
	 * 
	 * @param theTime
	 *            the current time
	 * @return the current date/time
	 */
	public static String getTimeNowHHmm(Date theTime) {
		return getDateTime(timePatternHHmm, theTime);
	}

	/**
	 * This method returns the current date time in the format: HH:MM:ss a
	 * 
	 * @param theTime
	 *            the current time
	 * @return the current date/time
	 */
	public static String getTimeNowHHmmss(Date theTime) {
		return getDateTime(timePatternHHmmss, theTime);
	}

	public static String getTimeNowHHmmss() {
		return getDateTime(timePatternHHmmss, new Date());
	}

	/**
	 * This method returns the current date in the format: MM/dd/yyyy
	 * 
	 * @return the current date
	 * @throws ParseException
	 */
	public static Calendar getToday() throws ParseException {
		Date today = new Date();
		SimpleDateFormat df = new SimpleDateFormat(datePattern);

		// This seems like quite a hack (date -> string -> date),
		// but it works ;-)
		String todayAsString = df.format(today);
		Calendar cal = new GregorianCalendar();
		cal.setTime(convertStringToDate(todayAsString));

		return cal;
	}

	/**
	 * This method generates a string representation of a date's date/time in
	 * the format you specify on input
	 * 
	 * @param aMask
	 *            the date pattern the string is in
	 * @param aDate
	 *            a date object
	 * @return a formatted string representation of the date
	 * 
	 * @see java.text.SimpleDateFormat
	 */
	public static final String getDateTime(String aMask, Date aDate) {
		SimpleDateFormat df = null;
		String returnValue = "";

		if (aDate == null) {
			log.error("aDate is null!");
		} else {
			df = new SimpleDateFormat(aMask);
			returnValue = df.format(aDate);
		}

		return (returnValue);
	}

	/**
	 * This method generates a string representation of a date based on the
	 * System Property 'dateFormat' in the format you specify on input
	 * 
	 * @param aDate
	 *            A date to convert
	 * @return a string representation of the date
	 */
	public static final String convertDateToStringDatepa(Date aDate) {
		return getDateTime(datePatternyy_MM_dd, aDate);
	}

	public static final String convertDateToStringByYYMMDD(Date aDate) {
		return getDateTime(datePatternyyyyMMdd, aDate);
	}

	/**
	 * This method generates a string representation of a date based on the
	 * System Property 'dateFormat' in the format you specify on input
	 * 
	 * @param aDate
	 *            A date to convert
	 * @return a string representation of the date
	 */
	public static final String convertDateToString(Date aDate) {
		return getDateTime(datePatternyy_MM_dd, aDate);
	}

	/**
	 * This method generates a string representation of a date based on the
	 * System Property 'dateFormat' in the format you specify on input
	 * 
	 * @param aDate
	 *            A date to convert
	 * @return a string representation of the date
	 */
	public static final String convertDateToStringymdhhmmss(Date aDate) {
		return getDateTime(datePattern_date_time, aDate);
	}

	/**
	 * This method converts a String to a date using the datePattern
	 * 
	 * @param strDate
	 *            the date to convert (in format MM/dd/yyyy)
	 * @return a date object
	 * 
	 * @throws ParseException
	 */
	public static Date convertStringToDate(String strDate)
			throws ParseException {
		Date aDate = null;

		try {
			if (log.isDebugEnabled()) {
				log.debug("converting date with pattern: "
						+ datePatternyy_MM_dd);
			}

			aDate = convertStringToDate(datePatternyy_MM_dd, strDate);
		} catch (ParseException pe) {
			log.error("Could not convert '" + strDate
					+ "' to a date, throwing exception");
			pe.printStackTrace();
			throw new ParseException(pe.getMessage(), pe.getErrorOffset());

		}

		return aDate;
	}
	
	/**
	 * add by lion
	 * This method converts a String to a date using the datePattern
	 * 
	 * @param strDate
	 *            the date to convert (in format datePattern_date_time)
	 * @return a date object
	 * 
	 * @throws ParseException
	 */
	public static Date convertyyMMddhhmmssToDate(String strDate)
			throws ParseException {
		Date aDate = null;

		try {
			if (log.isDebugEnabled()) {
				log.debug("converting date with pattern: "
						+ datePattern_date_time);
			}

			aDate = convertStringToDate(datePattern_date_time, strDate);
		} catch (ParseException pe) {
			log.error("Could not convert '" + strDate
					+ "' to a date, throwing exception");
			pe.printStackTrace();
			throw new ParseException(pe.getMessage(), pe.getErrorOffset());

		}

		return aDate;
	}

	/**
	 * This method converts a String to a date using the datePattern
	 * 
	 * @param strDate
	 *            the date to convert (in format MM/dd/yyyy HH:mm:ss)
	 * @return a date object
	 * 
	 * @throws ParseException
	 */
	public static Date convertStringToDateymdhhmmss(String strDate)
			throws ParseException {
		Date aDate = null;

		try {
			if (log.isDebugEnabled()) {
				log.debug("converting date with pattern: "
						+ datePattern_date_time);
			}

			aDate = convertStringToDate(datePattern_date_time, strDate);
		} catch (ParseException pe) {
			log.error("Could not convert '" + strDate
					+ "' to a date, throwing exception");
			pe.printStackTrace();
			throw new ParseException(pe.getMessage(), pe.getErrorOffset());

		}

		return aDate;
	}

	/**
	 * 时间减法
	 */
	public static String timeReduce(String date, int reduceNumber) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
		String t = "";
		try {
			Date dt = sdf.parse(date);
			t = sdf.format(new Date(dt.getTime() - reduceNumber * 24 * 60 * 60
					* 1000));
			// System.out.println(t);
		} catch (ParseException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		return t;
	}

	/**
	 * 将长时间格式字符串转换为字符串 yyyy-MM-dd HH:mm:ss
	 * 
	 * @return
	 */
	public static String longToStrng(long time) {
		// long型转换成的字符串
		Date date = new Date(time);
		SimpleDateFormat formatter = new SimpleDateFormat(datePattern_date_time);
		String dateString = formatter.format(date);
		// System.out.println("TIME:::" + dateString);
		return dateString;
	}

	/**
	 * 将长时间格式字符串转换为字符串 yyyyMMddHHmmss
	 * 
	 * @return
	 */
	public static String longToyyyyMMddHHmmss(long time) {
		// long型转换成的字符串
		Date date = new Date(time);
		SimpleDateFormat formatter = new SimpleDateFormat(
				datePatternyyMMddhhmmss);
		String dateString = formatter.format(date);
		// System.out.println("TIME:::" + dateString);
		return dateString;
	}

	/**
	 * 时间区间所包含的日期.
	 * 
	 * @param startDate
	 * @param endDate
	 */
	public String[] formatDate(String startDate, String endDate) {
		String[] date = null;
		if (startDate.equals(endDate)) {// 同一天.
			date = new String[] { endDate };
		} else if (startDate.substring(5, 7).equals(endDate.substring(5, 7))) {// 不同天,同一月.
			int a = Integer.parseInt(endDate.substring(8))
					- Integer.parseInt(startDate.substring(8));
			date = new String[a + 1];
			for (int i = 0; i <= a; i++) {
				date[i] = startDate.substring(0, 8)
						+ (Integer.parseInt(startDate.substring(8)) + i);
			}
		} else {// 不同天,不同月.
			String d[] = endDate.toString().split("-");
			int yy = Integer.parseInt(d[0]);
			int mm = Integer.parseInt(d[1]);
			int dd = Integer.parseInt(d[2]);
			mm = mm - 1;
			if (mm == 2) {
				dd = 28;
			} else if (mm == 1 || mm == 3 || mm == 5 || mm == 7 || mm == 8
					|| mm == 10 || mm == 12) {
				dd = 31;
			} else {
				dd = 30;
			}
			// 判断闰年
			boolean r = yy % 4 == 0 && yy % 100 != 0 || yy % 400 == 0;
			if (r && mm == 2)
				dd++;

			String temp = String.valueOf(yy) + "-"
					+ String.valueOf(mm < 10 ? "0" + mm : mm) + "-"
					+ String.valueOf(dd);
			int a = Integer.parseInt(temp.substring(8))
					- Integer.parseInt(startDate.substring(8));
			int b = Integer.parseInt(endDate.substring(8)) - 1;
			date = new String[a + b + 2];
			for (int i = 0; i <= a; i++) {
				date[i] = startDate.substring(0, 8)
						+ (Integer.parseInt(startDate.substring(8)) + i);
			}
			for (int i = 0; i <= b; i++) {
				date[a + i + 1] = endDate.substring(0, 8)
						+ ((i + 1) < 10 ? "0" + (i + 1) : (i + 1));
			}
		}
		for (int i = 0; i < date.length; i++) {
			System.out.println(date[i]);
		}
		return date;
	}

	/**
	 * 获得两个日期之间相差的天数
	 * 
	 * @param time1：开始时间
	 * @param time2：结束时间
	 * @return：两个日期之间相差的天数
	 */
	public static long getQuot(String time1, String time2) {
		long quot = 0;
		SimpleDateFormat ft = new SimpleDateFormat("yyyy-MM-dd");
		try {
			Date date1 = ft.parse(time1);
			Date date2 = ft.parse(time2);
			quot = date2.getTime() - date1.getTime();
			quot = quot / 1000 / 60 / 60 / 24;
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return quot;
	}

}