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<?php
/**
 * @package         Regular Labs Library
 * @version         23.12.1338
 * 
 * @author          Peter van Westen <info@regularlabs.com>
 * @link            https://regularlabs.com
 * @copyright       Copyright © 2023 Regular Labs All Rights Reserved
 * @license         GNU General Public License version 2 or later
 */

namespace RegularLabs\Library\Form\Field;

defined('_JEXEC') or die;

use Joomla\CMS\Form\Field\CheckboxesField as JCheckboxesField;
use Joomla\CMS\Form\FormHelper;
use Joomla\CMS\Language\Text as JText;
use SimpleXMLElement;
use UnexpectedValueException;
use function count;

class CheckboxesField extends JCheckboxesField
{
    /**
     * Name of the layout being used to render the field
     *
     * @var    string
     */
    protected $layout = 'regularlabs.form.field.checkboxes';

    protected function getLayoutPaths()
    {
        $paths   = parent::getLayoutPaths();
        $paths[] = JPATH_LIBRARIES . '/regularlabs/layouts';

        return $paths;
    }

    protected function getOptions()
    {
        $groups = $this->getGroups();

        return self::flattenGroups($groups);
    }

    private static function flattenGroups(array $groups): array
    {
        $options = [];

        foreach ($groups as $group_name => $group)
        {
            if ($group_name !== 0)
            {
                $options[] = $group_name;
            }

            foreach ($group as $option)
            {
                $options[] = $option;
            }
        }

        return $options;
    }

    private function getGroups(): array
    {
        $fieldname = preg_replace('/[^a-zA-Z0-9_\-]/', '_', $this->fieldname);
        $groups    = [];
        $label     = 0;

        foreach ($this->element->children() as $element)
        {
            switch ($element->getName())
            {
                // The element is an <option />
                case 'option':
                    if ( ! isset($groups[$label]))
                    {
                        $groups[$label] = [];
                    }

                    $groups[$label][] = $this->getOption($element, $fieldname);
                    break;

                // The element is a <group />
                case 'group':
                    // Get the group label.
                    $groupLabel = (string) $element['label'];

                    if ($groupLabel)
                    {
                        $label = JText::_($groupLabel);
                    }

                    // Initialize the group if necessary.
                    if ( ! isset($groups[$label]))
                    {
                        $groups[$label] = [];
                    }

                    // Iterate through the children and build an array of options.
                    foreach ($element->children() as $option)
                    {
                        // Only add <option /> elements.
                        if ($option->getName() !== 'option')
                        {
                            continue;
                        }

                        $groups[$label][] = $this->getOption($option, $fieldname);
                    }

                    if ($groupLabel)
                    {
                        $label = count($groups);
                    }
                    break;

                // Unknown element type.
                default:
                    throw new UnexpectedValueException(sprintf('Unsupported element %s in GroupedlistField', $element->getName()), 500);
            }
        }

        reset($groups);

        return $groups;
    }

    private function getOption(SimpleXMLElement $option, string $fieldname): object
    {
        $value = (string) $option['value'];
        $text  = trim((string) $option) != '' ? trim((string) $option) : $value;

        $disabled = (string) $option['disabled'];
        $disabled = ($disabled === 'true' || $disabled === 'disabled' || $disabled === '1');
        $disabled = $disabled || ($this->readonly && $value != $this->value);

        $checked = (string) $option['checked'];
        $checked = ($checked === 'true' || $checked === 'checked' || $checked === '1');

        $selected = (string) $option['selected'];
        $selected = ($selected === 'true' || $selected === 'selected' || $selected === '1');

        $tmp = [
            'value'    => $value,
            'text'     => JText::alt($text, $fieldname),
            'disable'  => $disabled,
            'class'    => (string) $option['class'],
            'selected' => ($checked || $selected),
            'checked'  => ($checked || $selected),
        ];

        // Set some event handler attributes. But really, should be using unobtrusive js.
        $tmp['onclick']  = (string) $option['onclick'];
        $tmp['onchange'] = (string) $option['onchange'];

        if ((string) $option['showon'])
        {
            $encodedConditions = json_encode(
                FormHelper::parseShowOnConditions((string) $option['showon'], $this->formControl, $this->group)
            );

            $tmp['optionattr'] = " data-showon='" . $encodedConditions . "'";
        }

        return (object) $tmp;
    }
}