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<?php
namespace JsonApi\Routes\Tree;
use JsonApi\Errors\BadRequestException;
use Psr\Http\Message\ServerRequestInterface as Request;
use Psr\Http\Message\ResponseInterface as Response;
use JsonApi\Errors\RecordNotFoundException;
use JsonApi\NonJsonApiController;
class CourseInfoOfTreeNode extends NonJsonApiController
{
protected $allowedFilteringParameters = ['q', 'semester', 'semclass', 'recursive'];
/**
* @SuppressWarnings(PHPMD.UnusedFormalParameters)
*/
public function __invoke(Request $request, Response $response, $args)
{
list($classname, $id) = explode('_', $args['id']);
$node = $classname::getNode($id);
if (!$node) {
throw new RecordNotFoundException();
}
$error = $this->validateFilters($request);
if ($error) {
throw new BadRequestException($error);
}
$filters = $this->getContextFilters($request);
$info = [
'courses' => (int) $node->countCourses($filters['semester'], $filters['semclass'], true)
];
$response->getBody()->write(json_encode($info));
return $response->withHeader('Content-type', 'application/json');
}
private function validateFilters($request)
{
$filtering = $request->getQueryParams()['filter'] ?? [];
// keyword aka q
if (isset($filtering['q']) && mb_strlen($filtering['q']) < 3) {
return 'Search term too short.';
}
// semester
if (isset($filtering['semester']) && $filtering['semester'] !== 'all') {
$semester = \Semester::find($filtering['semester']);
if (!$semester) {
return 'Invalid "semester".';
}
}
// course category
if (!empty($filtering['semclass'])) {
$semclass = \SeminarCategories::Get($filtering['semclass']);
if (!$semclass) {
return 'Invalid "course category".';
}
}
}
private function getContextFilters($request)
{
$defaults = [
'q' => '',
'semester' => 'all',
'semclass' => 0,
'recursive' => false
];
$filtering = $request->getQueryParams()['filter'] ?? [];
return array_merge($defaults, $filtering);
}
}
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