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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package jodd.time;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;

public class TimeUtil {

	public static final int SECONDS_IN_DAY = 60 * 60 * 24;
	public static final long MILLIS_IN_DAY = 1000L * SECONDS_IN_DAY;

	public static final SimpleDateFormat HTTP_DATE_FORMAT = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);

	/**
	 * Converts local date to Date.
	 */
	public static Date toDate(final LocalDate localDate) {
		return Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
	}
	/**
	 * Converts local date time to Date.
	 */
	public static Date toDate(final LocalDateTime localDateTime) {
		return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
	}

	/**
	 * Converts local date time to Calendar.
	 */
	public static Calendar toCalendar(final LocalDateTime localDateTime) {
		return GregorianCalendar.from(ZonedDateTime.of(localDateTime, ZoneId.systemDefault()));
	}

	/**
	 * Converts local date time to epoh milliseconds.
	 */
	public static long toMilliseconds(final LocalDateTime localDateTime) {
		return localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
	}

	/**
	 * Converts local date time to epoh milliseconds assuming start of the day as time point.
	 */
	public static long toMilliseconds(LocalDate localDate) {
		return toMilliseconds(localDate.atStartOfDay());
	}


	public static LocalDateTime fromCalendar(final Calendar calendar) {
		TimeZone tz = calendar.getTimeZone();
		ZoneId zid = tz == null ? ZoneId.systemDefault() : tz.toZoneId();
		return LocalDateTime.ofInstant(calendar.toInstant(), zid);
	}

	public static LocalDateTime fromDate(final Date date) {
		return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
	}

	public static LocalDateTime fromMilliseconds(final long milliseconds) {
		return LocalDateTime.ofInstant(Instant.ofEpochMilli(milliseconds), ZoneId.systemDefault());
	}


	/**
	 * Formats time to HTTP date/time format. Note that number of milliseconds
	 * is lost.
	 */
	public static String formatHttpDate(final long millis) {
		final Date date = new Date(millis);
		return HTTP_DATE_FORMAT.format(date);
	}

	/**
	 * Parses the HTTP date/time format. Returns -1 if given string
	 * is invalid.
	 */
	public static long parseHttpTime(final String time) {
		if (time == null) {
			return -1;
		}

		try {
			return TimeUtil.HTTP_DATE_FORMAT.parse(time).getTime();
		}
		catch (ParseException e) {
			return -1;
		}
	}

}