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/**
 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.liferay.portal.kernel.util;

import java.text.SimpleDateFormat;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

/**
 * View Source
 *
 * @author Brian Wing Shun Chan
 *
 */
public class Time {

	public static final long SECOND = 1000;

	public static final long MINUTE = SECOND * 60;

	public static final long HOUR = MINUTE * 60;

	public static final long DAY = HOUR * 24;

	public static final long WEEK = DAY * 7;

	public static final String RFC822_FORMAT = "EEE, dd MMM yyyy HH:mm:ss Z";

	public static final String TIMESTAMP_FORMAT = "yyyyMMddkkmmssSSS";

	public static final String SHORT_TIMESTAMP_FORMAT = "yyyyMMddkkmm";

	public static Date getDate(Calendar cal) {
		Calendar adjustedCal = CalendarFactoryUtil.getCalendar();

		adjustedCal.set(Calendar.YEAR, cal.get(Calendar.YEAR));
		adjustedCal.set(Calendar.MONTH, cal.get(Calendar.MONTH));
		adjustedCal.set(Calendar.DATE, cal.get(Calendar.DATE));
		adjustedCal.set(Calendar.HOUR_OF_DAY, cal.get(Calendar.HOUR_OF_DAY));
		adjustedCal.set(Calendar.MINUTE, cal.get(Calendar.MINUTE));
		adjustedCal.set(Calendar.SECOND, cal.get(Calendar.SECOND));
		adjustedCal.set(Calendar.MILLISECOND, cal.get(Calendar.MILLISECOND));

		return adjustedCal.getTime();
	}

	public static Date getDate(TimeZone tz) {
		Calendar cal = CalendarFactoryUtil.getCalendar(tz);

		return getDate(cal);
	}

	public static Date getDate(Date date, TimeZone tz) {
		Calendar cal = CalendarFactoryUtil.getCalendar(tz);

		cal.setTime(date);

		return getDate(cal);
	}

	public static String getDescription(long milliseconds) {
		String s = "";

		int x = 0;

		if (milliseconds % WEEK == 0) {
			x = (int)(milliseconds / WEEK);

			s = x + " Week";
		}
		else if (milliseconds % DAY == 0) {
			x = (int)(milliseconds / DAY);

			s = x + " Day";
		}
		else if (milliseconds % HOUR == 0) {
			x = (int)(milliseconds / HOUR);

			s = x + " Hour";
		}
		else if (milliseconds % MINUTE == 0) {
			x = (int)(milliseconds / MINUTE);

			s = x + " Minute";
		}
		else if (milliseconds % SECOND == 0) {
			x = (int)(milliseconds / SECOND);

			s = x + " Second";
		}

		if (x > 1) {
			s += "s";
		}

		return s;
	}

	public static String getRFC822() {
		return getRFC822(new Date());
	}

	public static String getRFC822(Date date) {
		return getSimpleDate(date, RFC822_FORMAT);
	}

	public static String getShortTimestamp() {
		return getShortTimestamp(new Date());
	}

	public static String getShortTimestamp(Date date) {
		return getSimpleDate(date, SHORT_TIMESTAMP_FORMAT);
	}

	public static String getSimpleDate(Date date, String format) {
		String s = StringPool.BLANK;

		if (date != null) {
			SimpleDateFormat sdf = new SimpleDateFormat(format);

			s = sdf.format(date);
		}

		return s;
	}

	public static String getTimestamp() {
		return getTimestamp(new Date());
	}

	public static String getTimestamp(Date date) {
		return getSimpleDate(date, TIMESTAMP_FORMAT);
	}

}