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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2013 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 Joomla\CMS\Language\Text;

/**
 * Form Field to load a list of predefined values
 *
 * @since  3.2
 */
abstract class PredefinedlistField extends ListField
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  3.2
	 */
	protected $type = 'Predefinedlist';

/**
	 * Cached array of the category items.
	 *
	 * @var    array
	 * @since  3.2
	 */
	protected static $options = array();

/**
	 * Available predefined options
	 *
	 * @var  array
	 * @since  3.2
	 */
	protected $predefinedOptions = array();

/**
	 * Translate options labels ?
	 *
	 * @var  boolean
	 * @since  3.2
	 */
	protected $translate = true;

/**
	 * Allows to use only specific values of the predefined list
	 *
	 * @var  array
	 * @since  4.0.0
	 */
	protected $optionsFilter = [];

/**
	 * 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     \Joomla\CMS\Form\FormField::setup()
	 * @since   4.0.0
	 */
	public function setup(\SimpleXMLElement $element, $value, $group = null)
	{
		$return = parent::setup($element, $value, $group);

if ($return)
		{
			// Note: $this->element['optionsFilter'] is not cast to string here to allow empty string value.
			$this->optionsFilter = $this->element['optionsFilter'] ? explode(',', (string) $this->element['optionsFilter']) : [];
		}

return $return;
	}

/**
	 * Method to get the options to populate list
	 *
	 * @return  array  The field option objects.
	 *
	 * @since   3.2
	 */
	protected function getOptions()
	{
		// Hash for caching
		$hash = md5($this->element);
		$type = strtolower($this->type);

if (!isset(static::$options[$type][$hash]) && !empty($this->predefinedOptions))
		{
			static::$options[$type][$hash] = parent::getOptions();

$options = array();

foreach ($this->predefinedOptions as $value => $text)
			{
				$val = (string) $value;

if (empty($this->optionsFilter) || in_array($val, $this->optionsFilter, true))
				{
					$text = $this->translate ? Text::_($text) : $text;

$options[] = (object) array(
						'value' => $value,
						'text'  => $text,
					);
				}
			}

static::$options[$type][$hash] = array_merge(static::$options[$type][$hash], $options);
		}

return static::$options[$type][$hash];
	}
}