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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2009 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Form\Field;

\defined('JPATH_PLATFORM') or die;

use DateTime;
use Joomla\CMS\Factory;
use Joomla\CMS\Form\FormField;
use Joomla\CMS\Language\Text;
use Joomla\Registry\Registry;

/**
 * Form Field class for the Joomla Platform.
 *
 * Provides a pop up date picker linked to a button.
 * Optionally may be filtered to use user's or server's time zone.
 *
 * @since  1.7.0
 */
class CalendarField extends FormField
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  1.7.0
	 */
	protected $type = 'Calendar';

/**
	 * The allowable maxlength of calendar field.
	 *
	 * @var    integer
	 * @since  3.2
	 */
	protected $maxlength;

/**
	 * The format of date and time.
	 *
	 * @var    string
	 * @since  3.2
	 */
	protected $format;

/**
	 * The format will be used to filter submitted date and time.
	 *
	 * @var    string
	 * @since  4.0.1
	 */
	protected $filterFormat;

/**
	 * The filter.
	 *
	 * @var    integer
	 * @since  3.2
	 */
	protected $filter;

/**
	 * The minimum year number to subtract/add from the current year
	 *
	 * @var    integer
	 * @since  3.7.0
	 */
	protected $minyear;

/**
	 * The maximum year number to subtract/add from the current year
	 *
	 * @var    integer
	 * @since  3.7.0
	 */
	protected $maxyear;

/**
	 * Name of the layout being used to render the field
	 *
	 * @var    string
	 * @since  3.7.0
	 */
	protected $layout = 'joomla.form.field.calendar';

/**
	 * The parent class of the field
	 *
	 * @var  string
	 * @since 4.0.0
	 */
	protected $parentclass;

/**
	 * Method to get certain otherwise inaccessible properties from the form field object.
	 *
	 * @param   string  $name  The property name for which to get the value.
	 *
	 * @return  mixed  The property value or null.
	 *
	 * @since   3.2
	 */
	public function __get($name)
	{
		switch ($name)
		{
			case 'maxlength':
			case 'format':
			case 'filterFormat':
			case 'filter':
			case 'timeformat':
			case 'todaybutton':
			case 'singleheader':
			case 'weeknumbers':
			case 'showtime':
			case 'filltable':
			case 'minyear':
			case 'maxyear':
				return $this->$name;
		}

return parent::__get($name);
	}

/**
	 * Method to set certain otherwise inaccessible properties of the form field object.
	 *
	 * @param   string  $name   The property name for which to set the value.
	 * @param   mixed   $value  The value of the property.
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	public function __set($name, $value)
	{
		switch ($name)
		{
			case 'maxlength':
			case 'timeformat':
				$this->$name = (int) $value;
				break;
			case 'todaybutton':
			case 'singleheader':
			case 'weeknumbers':
			case 'showtime':
			case 'filltable':
			case 'format':
			case 'filterFormat':
			case 'filter':
			case 'minyear':
			case 'maxyear':
				$this->$name = (string) $value;
				break;

default:
				parent::__set($name, $value);
		}
	}

/**
	 * Method to attach a Form object to the field.
	 *
	 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
	 * @param   mixed              $value    The form field value to validate.
	 * @param   string             $group    The field name group control value. This acts as an array container for the field.
	 *                                      For example if the field has name="foo" and the group value is set to "bar" then the
	 *                                      full field name would end up being "bar[foo]".
	 *
	 * @return  boolean  True on success.
	 *
	 * @see     FormField::setup()
	 * @since   3.2
	 */
	public function setup(\SimpleXMLElement $element, $value, $group = null)
	{
		$return = parent::setup($element, $value, $group);

if ($return)
		{
			$this->maxlength    = (int) $this->element['maxlength'] ? (int) $this->element['maxlength'] : 45;
			$this->format       = (string) $this->element['format'] ? (string) $this->element['format'] : '%Y-%m-%d';
			$this->filter       = (string) $this->element['filter'] ? (string) $this->element['filter'] : 'USER_UTC';
			$this->todaybutton  = (string) $this->element['todaybutton'] ? (string) $this->element['todaybutton'] : 'true';
			$this->weeknumbers  = (string) $this->element['weeknumbers'] ? (string) $this->element['weeknumbers'] : 'true';
			$this->showtime     = (string) $this->element['showtime'] ? (string) $this->element['showtime'] : 'false';
			$this->filltable    = (string) $this->element['filltable'] ? (string) $this->element['filltable'] : 'true';
			$this->timeformat   = (int) $this->element['timeformat'] ? (int) $this->element['timeformat'] : 24;
			$this->singleheader = (string) $this->element['singleheader'] ? (string) $this->element['singleheader'] : 'false';
			$this->minyear      = \strlen((string) $this->element['minyear']) ? (string) $this->element['minyear'] : null;
			$this->maxyear      = \strlen((string) $this->element['maxyear']) ? (string) $this->element['maxyear'] : null;

if ($this->maxyear < 0 || $this->minyear > 0)
			{
				$this->todaybutton = 'false';
			}

$translateFormat = (string) $this->element['translateformat'];

if ($translateFormat && $translateFormat !== 'false')
			{
				$showTime = (string) $this->element['showtime'];

$lang  = Factory::getLanguage();
				$debug = $lang->setDebug(false);

if ($showTime && $showTime !== 'false')
				{
					$this->format       = Text::_('DATE_FORMAT_CALENDAR_DATETIME');
					$this->filterFormat = Text::_('DATE_FORMAT_FILTER_DATETIME');
				}
				else
				{
					$this->format       = Text::_('DATE_FORMAT_CALENDAR_DATE');
					$this->filterFormat = Text::_('DATE_FORMAT_FILTER_DATE');
				}

$lang->setDebug($debug);
			}
		}

return $return;
	}

/**
	 * Method to get the field input markup.
	 *
	 * @return  string  The field input markup.
	 *
	 * @since   1.7.0
	 */
	protected function getInput()
	{
		$user = Factory::getApplication()->getIdentity();

// If a known filter is given use it.
		switch (strtoupper($this->filter))
		{
			case 'SERVER_UTC':
				// Convert a date to UTC based on the server timezone.
				if ($this->value && $this->value != Factory::getDbo()->getNullDate())
				{
					// Get a date object based on the correct timezone.
					$date = Factory::getDate($this->value, 'UTC');
					$date->setTimezone(new \DateTimeZone(Factory::getApplication()->get('offset')));

// Transform the date string.
					$this->value = $date->format('Y-m-d H:i:s', true, false);
				}
				break;
			case 'USER_UTC':
				// Convert a date to UTC based on the user timezone.
				if ($this->value && $this->value != Factory::getDbo()->getNullDate())
				{
					// Get a date object based on the correct timezone.
					$date = Factory::getDate($this->value, 'UTC');
					$date->setTimezone($user->getTimezone());

// Transform the date string.
					$this->value = $date->format('Y-m-d H:i:s', true, false);
				}
				break;
		}

// Format value when not nulldate ('0000-00-00 00:00:00'), otherwise blank it as it would result in 1970-01-01.
		if ($this->value && $this->value != Factory::getDbo()->getNullDate() && strtotime($this->value) !== false)
		{
			$tz = date_default_timezone_get();
			date_default_timezone_set('UTC');
			$this->value = strftime($this->format, strtotime($this->value));
			date_default_timezone_set($tz);
		}
		else
		{
			$this->value = '';
		}

return $this->getRenderer($this->layout)->render($this->getLayoutData());
	}

/**
	 * Method to get the data to be passed to the layout for rendering.
	 *
	 * @return  array
	 *
	 * @since  3.7.0
	 */
	protected function getLayoutData()
	{
		$data      = parent::getLayoutData();
		$lang      = Factory::getApplication()->getLanguage();
		$calendar  = $lang->getCalendar();
		$direction = strtolower(Factory::getDocument()->getDirection());

// Get the appropriate file for the current language date helper
		$helperPath = 'system/fields/calendar-locales/date/gregorian/date-helper.min.js';

if ($calendar && is_dir(JPATH_ROOT . '/media/system/js/fields/calendar-locales/date/' . strtolower($calendar)))
		{
			$helperPath = 'system/fields/calendar-locales/date/' . strtolower($calendar) . '/date-helper.min.js';
		}

$extraData = array(
			'value'        => $this->value,
			'maxLength'    => $this->maxlength,
			'format'       => $this->format,
			'filter'       => $this->filter,
			'todaybutton'  => ($this->todaybutton === 'true') ? 1 : 0,
			'weeknumbers'  => ($this->weeknumbers === 'true') ? 1 : 0,
			'showtime'     => ($this->showtime === 'true') ? 1 : 0,
			'filltable'    => ($this->filltable === 'true') ? 1 : 0,
			'timeformat'   => $this->timeformat,
			'singleheader' => ($this->singleheader === 'true') ? 1 : 0,
			'helperPath'   => $helperPath,
			'minYear'      => $this->minyear,
			'maxYear'      => $this->maxyear,
			'direction'    => $direction,
			'calendar'     => $calendar,
			'firstday'     => $lang->getFirstDay(),
			'weekend'      => explode(',', $lang->getWeekEnd()),
		);

return array_merge($data, $extraData);
	}

/**
	 * Method to filter a field value.
	 *
	 * @param   mixed     $value  The optional value to use as the default for the field.
	 * @param   string    $group  The optional dot-separated form group path on which to find the field.
	 * @param   Registry  $input  An optional Registry object with the entire data set to filter
	 *                            against the entire form.
	 *
	 * @return  mixed   The filtered value.
	 *
	 * @since   4.0.0
	 */
	public function filter($value, $group = null, Registry $input = null)
	{
		// Make sure there is a valid SimpleXMLElement.
		if (!($this->element instanceof \SimpleXMLElement))
		{
			throw new \UnexpectedValueException(sprintf('%s::filter `element` is not an instance of SimpleXMLElement', \get_class($this)));
		}

if ((int) $value <= 0)
		{
			return '';
		}

if ($this->filterFormat)
		{
			$value = DateTime::createFromFormat($this->filterFormat, $value)->format('Y-m-d H:i:s');
		}

$app = Factory::getApplication();

// Get the field filter type.
		$filter = (string) $this->element['filter'];

$return = $value;

switch (strtoupper($filter))
		{
			// Convert a date to UTC based on the server timezone offset.
			case 'SERVER_UTC':
				// Return an SQL formatted datetime string in UTC.
				$return = Factory::getDate($value, $app->get('offset'))->toSql();
				break;

// Convert a date to UTC based on the user timezone offset.
			case 'USER_UTC':
				// Get the user timezone setting defaulting to the server timezone setting.
				$offset = $app->getIdentity()->getParam('timezone', $app->get('offset'));

// Return an SQL formatted datetime string in UTC.
				$return = Factory::getDate($value, $offset)->toSql();
				break;
		}

return $return;
	}
}