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<?php
/**
 * @package     FOF
 * @copyright   2010-2017 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license     GNU GPL version 2 or later
 */

namespace FOF30\Date;

use DateInterval;
use DateTime;
use DateTimeZone;
use JDatabaseDriver;
use JFactory;
use JText;

defined('_JEXEC') or die;

/**
 * The Date class is a fork of Joomla's JDate. We had to fork that code in April 2017 when Joomla! 7.0 was released with
 * an untested change that completely broke date handling on PHP 7.0 and earlier versions. Since we can no longer trust
 * Joomla's core date and time handling we are providing our own, stable code.
 *
 * Date is a class that stores a date and provides logic to manipulate and render that date in a variety of formats.
 *
 * @method  Date|bool  add(DateInterval $interval)  Adds an amount of days, months, years, hours, minutes and seconds to a JDate object.
 * @method  Date|bool  sub(DateInterval $interval)  Subtracts an amount of days, months, years, hours, minutes and seconds from a JDate object.
 * @method  Date|bool  modify($modify)              Alter the timestamp of this object by incre/decre-menting in a format accepted by strtotime().
 *
 * @property-read  string   $daysinmonth   t - Number of days in the given month.
 * @property-read  string   $dayofweek     N - ISO-8601 numeric representation of the day of the week.
 * @property-read  string   $dayofyear     z - The day of the year (starting from 0).
 * @property-read  boolean  $isleapyear    L - Whether it's a leap year.
 * @property-read  string   $day           d - Day of the month, 2 digits with leading zeros.
 * @property-read  string   $hour          H - 24-hour format of an hour with leading zeros.
 * @property-read  string   $minute        i - Minutes with leading zeros.
 * @property-read  string   $second        s - Seconds with leading zeros.
 * @property-read  string   $microsecond   u - Microseconds with leading zeros.
 * @property-read  string   $month         m - Numeric representation of a month, with leading zeros.
 * @property-read  string   $ordinal       S - English ordinal suffix for the day of the month, 2 characters.
 * @property-read  string   $week          W - ISO-8601 week number of year, weeks starting on Monday.
 * @property-read  string   $year          Y - A full numeric representation of a year, 4 digits.
 */
class Date extends DateTime
{
	const DAY_ABBR = "\x021\x03";
	const DAY_NAME = "\x022\x03";
	const MONTH_ABBR = "\x023\x03";
	const MONTH_NAME = "\x024\x03";

	/**
	 * The format string to be applied when using the __toString() magic method.
	 *
	 * @var    string
	 */
	public static $format = 'Y-m-d H:i:s';

	/**
	 * Placeholder for a DateTimeZone object with GMT as the time zone.
	 *
	 * @var    object
	 */
	protected static $gmt;

	/**
	 * Placeholder for a DateTimeZone object with the default server
	 * time zone as the time zone.
	 *
	 * @var    object
	 */
	protected static $stz;

	/**
	 * The DateTimeZone object for usage in rending dates as strings.
	 *
	 * @var    DateTimeZone
	 */
	protected $tz;

	/**
	 * Constructor.
	 *
	 * @param   string  $date  String in a format accepted by strtotime(), defaults to "now".
	 * @param   mixed   $tz    Time zone to be used for the date. Might be a string or a DateTimeZone object.
	 */
	public function __construct($date = 'now', $tz = null)
	{
		// Create the base GMT and server time zone objects.
		if (empty(self::$gmt) || empty(self::$stz))
		{
			self::$gmt = new DateTimeZone('GMT');
			self::$stz = new DateTimeZone(@date_default_timezone_get());
		}

		// If the time zone object is not set, attempt to build it.
		if (!($tz instanceof DateTimeZone))
		{
			if ($tz === null)
			{
				$tz = self::$gmt;
			}
			elseif (is_string($tz))
			{
				$tz = new DateTimeZone($tz);
			}
		}

		// On PHP 7.1 and later use an integer timestamp, without microseconds, to preserve backwards compatibility.
		// See http://php.net/manual/en/migration71.incompatible.php#migration71.incompatible.datetime-microseconds
		if ($date === 'now' && version_compare(PHP_VERSION, '7.1.0', '>='))
		{
			$date = time();
		}

		// If the date is numeric assume a unix timestamp and convert it.
		date_default_timezone_set('UTC');
		$date = is_numeric($date) ? date('c', $date) : $date;

		// Call the DateTime constructor.
		parent::__construct($date, $tz);

		// Reset the timezone for 3rd party libraries/extension that does not use JDate
		date_default_timezone_set(self::$stz->getName());

		// Set the timezone object for access later.
		$this->tz = $tz;
	}

	/**
	 * Magic method to access properties of the date given by class to the format method.
	 *
	 * @param   string  $name  The name of the property.
	 *
	 * @return  mixed   A value if the property name is valid, null otherwise.
	 */
	public function __get($name)
	{
		$value = null;

		switch ($name)
		{
			case 'daysinmonth':
				$value = $this->format('t', true);
				break;

			case 'dayofweek':
				$value = $this->format('N', true);
				break;

			case 'dayofyear':
				$value = $this->format('z', true);
				break;

			case 'isleapyear':
				$value = (boolean) $this->format('L', true);
				break;

			case 'day':
				$value = $this->format('d', true);
				break;

			case 'hour':
				$value = $this->format('H', true);
				break;

			case 'minute':
				$value = $this->format('i', true);
				break;

			case 'second':
				$value = $this->format('s', true);
				break;

			case 'month':
				$value = $this->format('m', true);
				break;

			case 'ordinal':
				$value = $this->format('S', true);
				break;

			case 'week':
				$value = $this->format('W', true);
				break;

			case 'year':
				$value = $this->format('Y', true);
				break;

			default:
				$trace = debug_backtrace();
				trigger_error(
					'Undefined property via __get(): ' . $name . ' in ' . $trace[0]['file'] . ' on line ' . $trace[0]['line'],
					E_USER_NOTICE
				);
		}

		return $value;
	}

	/**
	 * Magic method to render the date object in the format specified in the public
	 * static member JDate::$format.
	 *
	 * @return  string  The date as a formatted string.
	 */
	public function __toString()
	{
		return (string) parent::format(self::$format);
	}

	/**
	 * Proxy for new JDate().
	 *
	 * @param   string  $date  String in a format accepted by strtotime(), defaults to "now".
	 * @param   mixed   $tz    Time zone to be used for the date.
	 *
	 * @return  Date
	 */
	public static function getInstance($date = 'now', $tz = null)
	{
		return new Date($date, $tz);
	}

	/**
	 * Translates day of week number to a string.
	 *
	 * @param   integer  $day   The numeric day of the week.
	 * @param   boolean  $abbr  Return the abbreviated day string?
	 *
	 * @return  string  The day of the week.
	 */
	public function dayToString($day, $abbr = false)
	{
		switch ($day)
		{
			case 0:
			default:
				return $abbr ? JText::_('SUN') : JText::_('SUNDAY');
			case 1:
				return $abbr ? JText::_('MON') : JText::_('MONDAY');
			case 2:
				return $abbr ? JText::_('TUE') : JText::_('TUESDAY');
			case 3:
				return $abbr ? JText::_('WED') : JText::_('WEDNESDAY');
			case 4:
				return $abbr ? JText::_('THU') : JText::_('THURSDAY');
			case 5:
				return $abbr ? JText::_('FRI') : JText::_('FRIDAY');
			case 6:
				return $abbr ? JText::_('SAT') : JText::_('SATURDAY');
		}
	}

	/**
	 * Gets the date as a formatted string in a local calendar.
	 *
	 * @param   string   $format     The date format specification string (see {@link PHP_MANUAL#date})
	 * @param   boolean  $local      True to return the date string in the local time zone, false to return it in GMT.
	 * @param   boolean  $translate  True to translate localised strings
	 *
	 * @return  string   The date string in the specified format format.
	 */
	public function calendar($format, $local = false, $translate = true)
	{
		return $this->format($format, $local, $translate);
	}

	/**
	 * Gets the date as a formatted string.
	 *
	 * @param   string   $format     The date format specification string (see {@link PHP_MANUAL#date})
	 * @param   boolean  $local      True to return the date string in the local time zone, false to return it in GMT.
	 * @param   boolean  $translate  True to translate localised strings
	 *
	 * @return  string   The date string in the specified format format.
	 */
	public function format($format, $local = false, $translate = true)
	{
		if ($translate)
		{
			// Do string replacements for date format options that can be translated.
			$format = preg_replace('/(^|[^\\\])D/', "\\1" . self::DAY_ABBR, $format);
			$format = preg_replace('/(^|[^\\\])l/', "\\1" . self::DAY_NAME, $format);
			$format = preg_replace('/(^|[^\\\])M/', "\\1" . self::MONTH_ABBR, $format);
			$format = preg_replace('/(^|[^\\\])F/', "\\1" . self::MONTH_NAME, $format);
		}

		// If the returned time should not be local use GMT.
		if ($local == false && !empty(self::$gmt))
		{
			parent::setTimezone(self::$gmt);
		}

		// Format the date.
		$return = parent::format($format);

		if ($translate)
		{
			// Manually modify the month and day strings in the formatted time.
			if (strpos($return, self::DAY_ABBR) !== false)
			{
				$return = str_replace(self::DAY_ABBR, $this->dayToString(parent::format('w'), true), $return);
			}

			if (strpos($return, self::DAY_NAME) !== false)
			{
				$return = str_replace(self::DAY_NAME, $this->dayToString(parent::format('w')), $return);
			}

			if (strpos($return, self::MONTH_ABBR) !== false)
			{
				$return = str_replace(self::MONTH_ABBR, $this->monthToString(parent::format('n'), true), $return);
			}

			if (strpos($return, self::MONTH_NAME) !== false)
			{
				$return = str_replace(self::MONTH_NAME, $this->monthToString(parent::format('n')), $return);
			}
		}

		if ($local == false && !empty($this->tz))
		{
			parent::setTimezone($this->tz);
		}

		return $return;
	}

	/**
	 * Get the time offset from GMT in hours or seconds.
	 *
	 * @param   boolean  $hours  True to return the value in hours.
	 *
	 * @return  float  The time offset from GMT either in hours or in seconds.
	 */
	public function getOffsetFromGmt($hours = false)
	{
		return (float) $hours ? ($this->tz->getOffset($this) / 3600) : $this->tz->getOffset($this);
	}

	/**
	 * Translates month number to a string.
	 *
	 * @param   integer  $month  The numeric month of the year.
	 * @param   boolean  $abbr   If true, return the abbreviated month string
	 *
	 * @return  string  The month of the year.
	 */
	public function monthToString($month, $abbr = false)
	{
		switch ($month)
		{
			case 1:
			default:
				return $abbr ? JText::_('JANUARY_SHORT') : JText::_('JANUARY');
			case 2:
				return $abbr ? JText::_('FEBRUARY_SHORT') : JText::_('FEBRUARY');
			case 3:
				return $abbr ? JText::_('MARCH_SHORT') : JText::_('MARCH');
			case 4:
				return $abbr ? JText::_('APRIL_SHORT') : JText::_('APRIL');
			case 5:
				return $abbr ? JText::_('MAY_SHORT') : JText::_('MAY');
			case 6:
				return $abbr ? JText::_('JUNE_SHORT') : JText::_('JUNE');
			case 7:
				return $abbr ? JText::_('JULY_SHORT') : JText::_('JULY');
			case 8:
				return $abbr ? JText::_('AUGUST_SHORT') : JText::_('AUGUST');
			case 9:
				return $abbr ? JText::_('SEPTEMBER_SHORT') : JText::_('SEPTEMBER');
			case 10:
				return $abbr ? JText::_('OCTOBER_SHORT') : JText::_('OCTOBER');
			case 11:
				return $abbr ? JText::_('NOVEMBER_SHORT') : JText::_('NOVEMBER');
			case 12:
				return $abbr ? JText::_('DECEMBER_SHORT') : JText::_('DECEMBER');
		}
	}

	/**
	 * Method to wrap the setTimezone() function and set the internal time zone object.
	 *
	 * @param   DateTimeZone  $tz  The new DateTimeZone object.
	 *
	 * @return  Date
	 *
	 * @note    This method can't be type hinted due to a PHP bug: https://bugs.php.net/bug.php?id=61483
	 */
	public function setTimezone($tz)
	{
		$this->tz = $tz;

		date_timezone_set($this, $tz);

		return $this;
	}

	/**
	 * Gets the date as an ISO 8601 string.  IETF RFC 3339 defines the ISO 8601 format
	 * and it can be found at the IETF Web site.
	 *
	 * @param   boolean  $local  True to return the date string in the local time zone, false to return it in GMT.
	 *
	 * @return  string  The date string in ISO 8601 format.
	 *
	 * @link    http://www.ietf.org/rfc/rfc3339.txt
	 */
	public function toISO8601($local = false)
	{
		return $this->format(DateTime::RFC3339, $local, false);
	}

	/**
	 * Gets the date as an SQL datetime string.
	 *
	 * @param   boolean          $local  True to return the date string in the local time zone, false to return it in GMT.
	 * @param   JDatabaseDriver  $db     The database driver or null to use JFactory::getDbo()
	 *
	 * @return  string     The date string in SQL datetime format.
	 *
	 * @link    http://dev.mysql.com/doc/refman/5.0/en/datetime.html
	 */
	public function toSql($local = false, JDatabaseDriver $db = null)
	{
		if ($db === null)
		{
			$db = JFactory::getDbo();
		}

		return $this->format($db->getDateFormat(), $local, false);
	}

	/**
	 * Gets the date as an RFC 822 string.  IETF RFC 2822 supercedes RFC 822 and its definition
	 * can be found at the IETF Web site.
	 *
	 * @param   boolean  $local  True to return the date string in the local time zone, false to return it in GMT.
	 *
	 * @return  string   The date string in RFC 822 format.
	 *
	 * @link    http://www.ietf.org/rfc/rfc2822.txt
	 */
	public function toRFC822($local = false)
	{
		return $this->format(DateTime::RFC2822, $local, false);
	}

	/**
	 * Gets the date as UNIX time stamp.
	 *
	 * @return  integer  The date as a UNIX timestamp.
	 */
	public function toUnix()
	{
		return (int) parent::format('U');
	}
}