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

defined('JPATH_PLATFORM') or die;

JFormHelper::loadFieldClass('groupedlist');

/**
 * Form Field class for the Joomla Platform.
 *
 * @since  1.7.0
 */
class JFormFieldTimezone extends JFormFieldGroupedList
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  1.7.0
	 */
	protected $type = 'Timezone';

	/**
	 * The list of available timezone groups to use.
	 *
	 * @var    array
	 * @since  1.7.0
	 */
	protected static $zones = array('Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific');

	/**
	 * The keyField of timezone field.
	 *
	 * @var    integer
	 * @since  3.2
	 */
	protected $keyField;

	/**
	 * 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 'keyField':
				return $this->keyField;
		}

		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 'keyField':
				$this->keyField = (string) $value;
				break;

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

	/**
	 * Method to attach a JForm 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     JFormField::setup()
	 * @since   3.2
	 */
	public function setup(SimpleXMLElement $element, $value, $group = null)
	{
		$return = parent::setup($element, $value, $group);

		if ($return)
		{
			$this->keyField = (string) $this->element['key_field'];
		}

		return $return;
	}

	/**
	 * Method to get the time zone field option groups.
	 *
	 * @return  array  The field option objects as a nested array in groups.
	 *
	 * @since   1.7.0
	 */
	protected function getGroups()
	{
		$groups = array();

		// Get the list of time zones from the server.
		$zones = DateTimeZone::listIdentifiers();

		// Build the group lists.
		foreach ($zones as $zone)
		{
			// Time zones not in a group we will ignore.
			if (strpos($zone, '/') === false)
			{
				continue;
			}

			// Get the group/locale from the timezone.
			list ($group, $locale) = explode('/', $zone, 2);

			// Only use known groups.
			if (in_array($group, self::$zones))
			{
				// Initialize the group if necessary.
				if (!isset($groups[$group]))
				{
					$groups[$group] = array();
				}

				// Only add options where a locale exists.
				if (!empty($locale))
				{
					$groups[$group][$zone] = JHtml::_('select.option', $zone, str_replace('_', ' ', $locale), 'value', 'text', false);
				}
			}
		}

		// Sort the group lists.
		ksort($groups);

		foreach ($groups as &$location)
		{
			sort($location);
		}

		// Merge any additional groups in the XML definition.
		$groups = array_merge(parent::getGroups(), $groups);

		return $groups;
	}
}