WebRequestActivityInstanceResolver.php

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<?php

namespace BristolSU\Support\ActivityInstance;

use BristolSU\Support\ActivityInstance\Contracts\ActivityInstanceRepository as ActivityInstanceRepositoryContract;
use BristolSU\Support\ActivityInstance\Contracts\ActivityInstanceResolver;
use BristolSU\Support\ActivityInstance\Exceptions\NotInActivityInstanceException;
use Illuminate\Http\Request;

class WebRequestActivityInstanceResolver implements ActivityInstanceResolver
{
    private $request;

    private $activityInstanceRepository;

    public function __construct(Request $request, ActivityInstanceRepositoryContract $activityInstanceRepository)
    {
        $this->request = $request;
        $this->activityInstanceRepository = $activityInstanceRepository;
    }

    public function setActivityInstance(ActivityInstance $activityInstance)
    {
        $this->request->query->set('a', $activityInstance->id);
        $this->request->overrideGlobals();
    }

    public function getActivityInstance(): ActivityInstance
    {
        if ($this->request->query->has('a')) {
            return $this->activityInstanceRepository->getById(
                $this->request->query->get('a')
            );
        }

        throw new NotInActivityInstanceException;
    }

    public function clearActivityInstance()
    {
        $this->request->query->remove('a');
        $this->request->overrideGlobals();
    }
}