<?php
/**
 * @package         Regular Labs Library
 * @version         23.12.10783
 * 
 * @author          Peter van Westen <[email protected]>
 * @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;

use InvalidArgumentException;
use Joomla\CMS\Form\Field\SubformField as JSubformField;
use Joomla\CMS\Form\Form;
use RuntimeException;
use function count;

defined('_JEXEC') or die;

class SubformField extends JSubformField
{
    /**
     * @var    string
     */
    protected $layout = 'regularlabs.form.field.subform.repeatable';

    /**
     * @param string $name  The property name for which to set the value.
     * @param mixed  $value The value of the property.
     */
    public function __set($name, $value)
    {
        switch ($name)
        {
            case 'layout':
                $this->layout = (string) $value;

                if ( ! $this->layout)
                {
                    $this->layout = ! $this->multiple ? 'joomla.form.field.subform.default' : 'regularlabs.form.field.subform.repeatable';
                }
                break;

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

    /**
     * Loads the form instance for the subform.
     *
     * @return  Form  The form instance.
     *
     * @throws  InvalidArgumentException if no form provided.
     * @throws  RuntimeException if the form could not be loaded.
     */
    public function loadSubForm()
    {
        $control = $this->name;

        if ($this->multiple)
        {
            $control .= '[' . $this->fieldname . 'X]';
        }

        // Prepare the form template
        $formname = 'subform.' . str_replace(['jform[', '[', ']'], ['', '.', ''], $this->name);

        return $this->loadSubFormByName($formname, $control);
    }

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

        return $paths;
    }

    /**
     * Loads the form instance for the subform by given name and control.
     *
     * @param string $name    The name of the form.
     * @param string $control The control name of the form.
     *
     * @return  Form  The form instance.
     *
     * @throws  InvalidArgumentException if no form provided.
     * @throws  RuntimeException if the form could not be loaded.
     */
    protected function loadSubFormByName($name, $control)
    {
        // Prepare the form template
        return Form::getInstance($name, $this->formsource, ['control' => $control]);
    }

    /**
     * Binds given data to the subform and its elements.
     *
     * @param Form $subForm Form instance of the subform.
     *
     * @return  Form[]  Array of Form instances for the rows.
     */
    protected function loadSubFormData(Form $subForm)
    {
        $value = $this->value ? (array) $this->value : [];

        // Simple form, just bind the data and return one row.
        if ( ! $this->multiple)
        {
            $subForm->bind($value);

            return [$subForm];
        }

        // Multiple rows possible: Construct array and bind values to their respective forms.
        $forms = [];
        $value = array_values($value);

        // Show as many rows as we have values, but at least min and at most max.
        $c = max($this->min, min(count($value), $this->max));

        for ($i = 0; $i < $c; $i++)
        {
            $control  = $this->name . '[' . $this->fieldname . $i . ']';
            $itemForm = $this->loadSubFormByName($subForm->getName() . $i, $control);

            if ( ! empty($value[$i]))
            {
                $itemForm->bind($value[$i]);
            }

            $forms[] = $itemForm;
        }

        return $forms;
    }
}