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<?php
namespace JsonApi\Routes\Courseware;
use Courseware\Instance;
use Courseware\StructuralElement;
use Courseware\Unit;
use JsonApi\Errors\BadRequestException;
use JsonApi\Errors\RecordNotFoundException;
trait CoursewareInstancesHelper
{
private function findInstance(string $instanceId): Instance
{
[$rangeType, $rangeId] = explode('_', $instanceId);
if (!is_string($rangeType) || !is_string($rangeId)) {
throw new BadRequestException('Invalid instance id: "' . $instanceId . '".');
}
return $this->findInstanceWithRange($rangeType, $rangeId);
}
private function findInstanceWithRange(string $rangeType, string $rangeId): Instance
{
$methods = [
'course' => 'getCoursewareCourse',
'courses' => 'getCoursewareCourse',
'user' => 'getCoursewareUser',
'users' => 'getCoursewareUser',
'sharedusers' => 'getSharedCoursewareUser',
];
if (!($method = $methods[$rangeType])) {
throw new BadRequestException('Invalid range type: "' . $rangeType . '".');
}
$root = null;
if ($rangeType !== 'sharedusers') {
$chunks = explode('_', $rangeId);
$courseId = $chunks[0];
$unitId = $chunks[1] ?? null;
if ($unitId === '') {
throw new BadRequestException('Unit id must not be empty.');
}
if ($unitId) {
$unit = Unit::findOneBySQL('range_id = ? AND id = ?', [$courseId, $unitId]);
} else {
$unit = Unit::findOneBySQL('range_id = ?', [$courseId]);
}
if ($unit) {
$root = $unit->structural_element;
}
} else {
$root = StructuralElement::$method($rangeId);
}
if (!$root) {
throw new RecordNotFoundException();
}
return new Instance($root);
}
}
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