Instance.php

<?php

namespace Courseware;

/**
 * This class represents an instance of a courseware of a course or a user.
 *
 * @author  Marcus Eibrink-Lunzenauer <lunzenauer@elan-ev.de>
 * @author  Ron Lucke <lucke@elan-ev.de>
 * @license GPL2 or any later version
 *
 * @since   Stud.IP 5.0
 */
class Instance
{
    public static function deleteForRange(\Range $range): void
    {
        $root = null;
        switch ($range->getRangeType()) {
            case 'course':
                $root = StructuralElement::getCoursewareCourse($range->getRangeId());
                break;
            case 'user':
                $root = StructuralElement::getCoursewareUser($range->getRangeId());
                break;
            default:
                throw new \InvalidArgumentException('Only ranges of type "user" and "course" are currently supported.');
        }

        // there is no courseware for this course
        if (!$root) {
            return;
        }

        $instance = new self($root);

        $range->getConfiguration()->delete('COURSEWARE_SEQUENTIAL_PROGRESSION');
        $range->getConfiguration()->delete('COURSEWARE_EDITING_PERMISSION');

        $last_element_configs = \ConfigValue::findBySQL('field = ? AND value LIKE ?', ['COURSEWARE_LAST_ELEMENT', '%'.$range->getRangeId().'%']);
        foreach ($last_element_configs as $config) {
            $arr = json_decode($config->value, true);
            $arr = array_filter($arr, function ($key) use ($range) {
                return $key !== $range->id;
            }, ARRAY_FILTER_USE_KEY);
            \UserConfig::get($config->range_id)->unsetValue('COURSEWARE_LAST_ELEMENT');
            \UserConfig::get($config->range_id)->store('COURSEWARE_LAST_ELEMENT', $arr);
        }

        $root->delete();
    }

    /**
     * @var StructuralElement
     */
    private $root;

    /**
     * Create a new representation of a a courseware instance.
     *
     * This model class purely represents and does not create anything. Its purpose is to have all things related to a
     * single courseware instance in one place.
     *
     * @param StructuralElement $root the root of this courseware instance
     */
    public function __construct(StructuralElement $root)
    {
        $this->root = $root;
    }