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<?php
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/**
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 * PHPExcel
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 *
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 * Copyright (c) 2006 - 2013 PHPExcel
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 * @category   PHPExcel
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 * @package	PHPExcel_Shared
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 * @license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
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 * @version	##VERSION##, ##DATE##
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 */
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/**
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 * PHPExcel_Shared_TimeZone
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 *
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 * @category   PHPExcel
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 * @package	PHPExcel_Shared
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 */
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class PHPExcel_Shared_TimeZone
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{
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	/*
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	 * Default Timezone used for date/time conversions
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	 *
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	 * @private
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	 * @var	string
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	 */
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	protected static $_timezone	= 'UTC';
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	/**
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	 * Validate a Timezone name
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	 *
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	 * @param	 string		$timezone			Time zone (e.g. 'Europe/London')
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	 * @return	 boolean						Success or failure
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	 */
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	public static function _validateTimeZone($timezone) {
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		if (in_array($timezone, DateTimeZone::listIdentifiers())) {
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			return TRUE;
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		}
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		return FALSE;
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	}
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	/**
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	 * Set the Default Timezone used for date/time conversions
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	 *
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	 * @param	 string		$timezone			Time zone (e.g. 'Europe/London')
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	 * @return	 boolean						Success or failure
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	 */
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	public static function setTimeZone($timezone) {
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		if (self::_validateTimezone($timezone)) {
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			self::$_timezone = $timezone;
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			return TRUE;
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		}
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		return FALSE;
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	}	//	function setTimezone()
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	/**
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	 * Return the Default Timezone used for date/time conversions
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	 *
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	 * @return	 string		Timezone (e.g. 'Europe/London')
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	 */
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	public static function getTimeZone() {
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		return self::$_timezone;
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	}	//	function getTimezone()
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	/**
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	 *	Return the Timezone transition for the specified timezone and timestamp
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	 *
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	 *	@param		DateTimeZone	 	$objTimezone	The timezone for finding the transitions
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	 *	@param		integer	 			$timestamp		PHP date/time value for finding the current transition
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	 *	@return	 	array				The current transition details
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	 */
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	private static function _getTimezoneTransitions($objTimezone, $timestamp) {
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		$allTransitions = $objTimezone->getTransitions();
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		$transitions = array();
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		foreach($allTransitions as $key => $transition) {
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			if ($transition['ts'] > $timestamp) {
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				$transitions[] = ($key > 0) ? $allTransitions[$key - 1] : $transition;
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				break;
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			}
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			if (empty($transitions)) {
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				$transitions[] = end($allTransitions);
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			}
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		}
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		return $transitions;
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	}
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	/**
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	 *	Return the Timezone offset used for date/time conversions to/from UST
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	 *	This requires both the timezone and the calculated date/time to allow for local DST
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	 *
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	 *	@param		string	 			$timezone		The timezone for finding the adjustment to UST
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	 *	@param		integer	 			$timestamp		PHP date/time value
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	 *	@return	 	integer				Number of seconds for timezone adjustment
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	 *	@throws		PHPExcel_Exception
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	 */
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	public static function getTimeZoneAdjustment($timezone, $timestamp) {
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		if ($timezone !== NULL) {
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			if (!self::_validateTimezone($timezone)) {
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				throw new PHPExcel_Exception("Invalid timezone " . $timezone);
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			}
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		} else {
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			$timezone = self::$_timezone;
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		}
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		if ($timezone == 'UST') {
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			return 0;
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		}
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		$objTimezone = new DateTimeZone($timezone);
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		if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
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			$transitions = $objTimezone->getTransitions($timestamp,$timestamp);
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		} else {
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			$transitions = self::_getTimezoneTransitions($objTimezone, $timestamp);
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		}
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		return (count($transitions) > 0) ? $transitions[0]['offset'] : 0;
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	}
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}